Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/i386/i386/machdep.c
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1 /*- 2 * Copyright (c) 1992 Terrence R. Lambert. 3 * Copyright (c) 1982, 1987, 1990 The Regents of the University of California. 4 * All rights reserved. 5 * 6 * This code is derived from software contributed to Berkeley by 7 * William Jolitz. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed by the University of 20 * California, Berkeley and its contributors. 21 * 4. Neither the name of the University nor the names of its contributors 22 * may be used to endorse or promote products derived from this software 23 * without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 * 37 * from: @(#)machdep.c 7.4 (Berkeley) 6/3/91 38 */ 39 40 #include <sys/cdefs.h> 41 __FBSDID("$FreeBSD: releng/6.0/sys/i386/i386/machdep.c 148469 2005-07-28 03:30:53Z jkoshy $"); 42 43 #include "opt_apic.h" 44 #include "opt_atalk.h" 45 #include "opt_compat.h" 46 #include "opt_cpu.h" 47 #include "opt_ddb.h" 48 #include "opt_inet.h" 49 #include "opt_ipx.h" 50 #include "opt_isa.h" 51 #include "opt_kstack_pages.h" 52 #include "opt_maxmem.h" 53 #include "opt_msgbuf.h" 54 #include "opt_npx.h" 55 #include "opt_perfmon.h" 56 57 #include <sys/param.h> 58 #include <sys/proc.h> 59 #include <sys/systm.h> 60 #include <sys/bio.h> 61 #include <sys/buf.h> 62 #include <sys/bus.h> 63 #include <sys/callout.h> 64 #include <sys/cons.h> 65 #include <sys/cpu.h> 66 #include <sys/eventhandler.h> 67 #include <sys/exec.h> 68 #include <sys/imgact.h> 69 #include <sys/kdb.h> 70 #include <sys/kernel.h> 71 #include <sys/ktr.h> 72 #include <sys/linker.h> 73 #include <sys/lock.h> 74 #include <sys/malloc.h> 75 #include <sys/memrange.h> 76 #include <sys/msgbuf.h> 77 #include <sys/mutex.h> 78 #include <sys/pcpu.h> 79 #include <sys/ptrace.h> 80 #include <sys/reboot.h> 81 #include <sys/sched.h> 82 #include <sys/signalvar.h> 83 #include <sys/sysctl.h> 84 #include <sys/sysent.h> 85 #include <sys/sysproto.h> 86 #include <sys/ucontext.h> 87 #include <sys/vmmeter.h> 88 89 #include <vm/vm.h> 90 #include <vm/vm_extern.h> 91 #include <vm/vm_kern.h> 92 #include <vm/vm_page.h> 93 #include <vm/vm_map.h> 94 #include <vm/vm_object.h> 95 #include <vm/vm_pager.h> 96 #include <vm/vm_param.h> 97 98 #ifdef DDB 99 #ifndef KDB 100 #error KDB must be enabled in order for DDB to work! 101 #endif 102 #include <ddb/ddb.h> 103 #include <ddb/db_sym.h> 104 #endif 105 106 #include <isa/rtc.h> 107 108 #include <net/netisr.h> 109 110 #include <machine/bootinfo.h> 111 #include <machine/clock.h> 112 #include <machine/cpu.h> 113 #include <machine/cputypes.h> 114 #include <machine/intr_machdep.h> 115 #include <machine/md_var.h> 116 #include <machine/pc/bios.h> 117 #include <machine/pcb.h> 118 #include <machine/pcb_ext.h> 119 #include <machine/proc.h> 120 #include <machine/reg.h> 121 #include <machine/sigframe.h> 122 #include <machine/specialreg.h> 123 #include <machine/vm86.h> 124 #ifdef PERFMON 125 #include <machine/perfmon.h> 126 #endif 127 #ifdef SMP 128 #include <machine/privatespace.h> 129 #include <machine/smp.h> 130 #endif 131 132 #ifdef DEV_ISA 133 #include <i386/isa/icu.h> 134 #endif 135 136 /* Sanity check for __curthread() */ 137 CTASSERT(offsetof(struct pcpu, pc_curthread) == 0); 138 139 extern void init386(int first); 140 extern void dblfault_handler(void); 141 142 extern void printcpuinfo(void); /* XXX header file */ 143 extern void finishidentcpu(void); 144 extern void panicifcpuunsupported(void); 145 extern void initializecpu(void); 146 147 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL) 148 #define EFL_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) 149 150 #if !defined(CPU_DISABLE_SSE) && defined(I686_CPU) 151 #define CPU_ENABLE_SSE 152 #endif 153 154 static void cpu_startup(void *); 155 static void fpstate_drop(struct thread *td); 156 static void get_fpcontext(struct thread *td, mcontext_t *mcp); 157 static int set_fpcontext(struct thread *td, const mcontext_t *mcp); 158 #ifdef CPU_ENABLE_SSE 159 static void set_fpregs_xmm(struct save87 *, struct savexmm *); 160 static void fill_fpregs_xmm(struct savexmm *, struct save87 *); 161 #endif /* CPU_ENABLE_SSE */ 162 SYSINIT(cpu, SI_SUB_CPU, SI_ORDER_FIRST, cpu_startup, NULL) 163 164 #ifdef DDB 165 extern vm_offset_t ksym_start, ksym_end; 166 #endif 167 168 int _udatasel, _ucodesel; 169 u_int basemem; 170 171 int cold = 1; 172 173 #ifdef COMPAT_43 174 static void osendsig(sig_t catcher, int sig, sigset_t *mask, u_long code); 175 #endif 176 #ifdef COMPAT_FREEBSD4 177 static void freebsd4_sendsig(sig_t catcher, int sig, sigset_t *mask, 178 u_long code); 179 #endif 180 181 long Maxmem = 0; 182 long realmem = 0; 183 184 vm_paddr_t phys_avail[10]; 185 vm_paddr_t dump_avail[10]; 186 187 /* must be 2 less so 0 0 can signal end of chunks */ 188 #define PHYS_AVAIL_ARRAY_END ((sizeof(phys_avail) / sizeof(phys_avail[0])) - 2) 189 #define DUMP_AVAIL_ARRAY_END ((sizeof(dump_avail) / sizeof(dump_avail[0])) - 2) 190 191 struct kva_md_info kmi; 192 193 static struct trapframe proc0_tf; 194 #ifndef SMP 195 static struct pcpu __pcpu; 196 #endif 197 198 struct mtx icu_lock; 199 200 struct mem_range_softc mem_range_softc; 201 202 static void 203 cpu_startup(dummy) 204 void *dummy; 205 { 206 /* 207 * Good {morning,afternoon,evening,night}. 208 */ 209 startrtclock(); 210 printcpuinfo(); 211 panicifcpuunsupported(); 212 #ifdef PERFMON 213 perfmon_init(); 214 #endif 215 printf("real memory = %ju (%ju MB)\n", ptoa((uintmax_t)Maxmem), 216 ptoa((uintmax_t)Maxmem) / 1048576); 217 realmem = Maxmem; 218 /* 219 * Display any holes after the first chunk of extended memory. 220 */ 221 if (bootverbose) { 222 int indx; 223 224 printf("Physical memory chunk(s):\n"); 225 for (indx = 0; phys_avail[indx + 1] != 0; indx += 2) { 226 vm_paddr_t size; 227 228 size = phys_avail[indx + 1] - phys_avail[indx]; 229 printf( 230 "0x%016jx - 0x%016jx, %ju bytes (%ju pages)\n", 231 (uintmax_t)phys_avail[indx], 232 (uintmax_t)phys_avail[indx + 1] - 1, 233 (uintmax_t)size, (uintmax_t)size / PAGE_SIZE); 234 } 235 } 236 237 vm_ksubmap_init(&kmi); 238 239 printf("avail memory = %ju (%ju MB)\n", 240 ptoa((uintmax_t)cnt.v_free_count), 241 ptoa((uintmax_t)cnt.v_free_count) / 1048576); 242 243 /* 244 * Set up buffers, so they can be used to read disk labels. 245 */ 246 bufinit(); 247 vm_pager_bufferinit(); 248 249 cpu_setregs(); 250 } 251 252 /* 253 * Send an interrupt to process. 254 * 255 * Stack is set up to allow sigcode stored 256 * at top to call routine, followed by kcall 257 * to sigreturn routine below. After sigreturn 258 * resets the signal mask, the stack, and the 259 * frame pointer, it returns to the user 260 * specified pc, psl. 261 */ 262 #ifdef COMPAT_43 263 static void 264 osendsig(catcher, sig, mask, code) 265 sig_t catcher; 266 int sig; 267 sigset_t *mask; 268 u_long code; 269 { 270 struct osigframe sf, *fp; 271 struct proc *p; 272 struct thread *td; 273 struct sigacts *psp; 274 struct trapframe *regs; 275 int oonstack; 276 277 td = curthread; 278 p = td->td_proc; 279 PROC_LOCK_ASSERT(p, MA_OWNED); 280 psp = p->p_sigacts; 281 mtx_assert(&psp->ps_mtx, MA_OWNED); 282 regs = td->td_frame; 283 oonstack = sigonstack(regs->tf_esp); 284 285 /* Allocate space for the signal handler context. */ 286 if ((td->td_pflags & TDP_ALTSTACK) && !oonstack && 287 SIGISMEMBER(psp->ps_sigonstack, sig)) { 288 fp = (struct osigframe *)(td->td_sigstk.ss_sp + 289 td->td_sigstk.ss_size - sizeof(struct osigframe)); 290 #if defined(COMPAT_43) 291 td->td_sigstk.ss_flags |= SS_ONSTACK; 292 #endif 293 } else 294 fp = (struct osigframe *)regs->tf_esp - 1; 295 296 /* Translate the signal if appropriate. */ 297 if (p->p_sysent->sv_sigtbl && sig <= p->p_sysent->sv_sigsize) 298 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)]; 299 300 /* Build the argument list for the signal handler. */ 301 sf.sf_signum = sig; 302 sf.sf_scp = (register_t)&fp->sf_siginfo.si_sc; 303 if (SIGISMEMBER(psp->ps_siginfo, sig)) { 304 /* Signal handler installed with SA_SIGINFO. */ 305 sf.sf_arg2 = (register_t)&fp->sf_siginfo; 306 sf.sf_siginfo.si_signo = sig; 307 sf.sf_siginfo.si_code = code; 308 sf.sf_ahu.sf_action = (__osiginfohandler_t *)catcher; 309 } else { 310 /* Old FreeBSD-style arguments. */ 311 sf.sf_arg2 = code; 312 sf.sf_addr = regs->tf_err; 313 sf.sf_ahu.sf_handler = catcher; 314 } 315 mtx_unlock(&psp->ps_mtx); 316 PROC_UNLOCK(p); 317 318 /* Save most if not all of trap frame. */ 319 sf.sf_siginfo.si_sc.sc_eax = regs->tf_eax; 320 sf.sf_siginfo.si_sc.sc_ebx = regs->tf_ebx; 321 sf.sf_siginfo.si_sc.sc_ecx = regs->tf_ecx; 322 sf.sf_siginfo.si_sc.sc_edx = regs->tf_edx; 323 sf.sf_siginfo.si_sc.sc_esi = regs->tf_esi; 324 sf.sf_siginfo.si_sc.sc_edi = regs->tf_edi; 325 sf.sf_siginfo.si_sc.sc_cs = regs->tf_cs; 326 sf.sf_siginfo.si_sc.sc_ds = regs->tf_ds; 327 sf.sf_siginfo.si_sc.sc_ss = regs->tf_ss; 328 sf.sf_siginfo.si_sc.sc_es = regs->tf_es; 329 sf.sf_siginfo.si_sc.sc_fs = regs->tf_fs; 330 sf.sf_siginfo.si_sc.sc_gs = rgs(); 331 sf.sf_siginfo.si_sc.sc_isp = regs->tf_isp; 332 333 /* Build the signal context to be used by osigreturn(). */ 334 sf.sf_siginfo.si_sc.sc_onstack = (oonstack) ? 1 : 0; 335 SIG2OSIG(*mask, sf.sf_siginfo.si_sc.sc_mask); 336 sf.sf_siginfo.si_sc.sc_sp = regs->tf_esp; 337 sf.sf_siginfo.si_sc.sc_fp = regs->tf_ebp; 338 sf.sf_siginfo.si_sc.sc_pc = regs->tf_eip; 339 sf.sf_siginfo.si_sc.sc_ps = regs->tf_eflags; 340 sf.sf_siginfo.si_sc.sc_trapno = regs->tf_trapno; 341 sf.sf_siginfo.si_sc.sc_err = regs->tf_err; 342 343 /* 344 * If we're a vm86 process, we want to save the segment registers. 345 * We also change eflags to be our emulated eflags, not the actual 346 * eflags. 347 */ 348 if (regs->tf_eflags & PSL_VM) { 349 /* XXX confusing names: `tf' isn't a trapframe; `regs' is. */ 350 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs; 351 struct vm86_kernel *vm86 = &td->td_pcb->pcb_ext->ext_vm86; 352 353 sf.sf_siginfo.si_sc.sc_gs = tf->tf_vm86_gs; 354 sf.sf_siginfo.si_sc.sc_fs = tf->tf_vm86_fs; 355 sf.sf_siginfo.si_sc.sc_es = tf->tf_vm86_es; 356 sf.sf_siginfo.si_sc.sc_ds = tf->tf_vm86_ds; 357 358 if (vm86->vm86_has_vme == 0) 359 sf.sf_siginfo.si_sc.sc_ps = 360 (tf->tf_eflags & ~(PSL_VIF | PSL_VIP)) | 361 (vm86->vm86_eflags & (PSL_VIF | PSL_VIP)); 362 363 /* See sendsig() for comments. */ 364 tf->tf_eflags &= ~(PSL_VM | PSL_NT | PSL_VIF | PSL_VIP); 365 } 366 367 /* 368 * Copy the sigframe out to the user's stack. 369 */ 370 if (copyout(&sf, fp, sizeof(*fp)) != 0) { 371 #ifdef DEBUG 372 printf("process %ld has trashed its stack\n", (long)p->p_pid); 373 #endif 374 PROC_LOCK(p); 375 sigexit(td, SIGILL); 376 } 377 378 regs->tf_esp = (int)fp; 379 regs->tf_eip = PS_STRINGS - szosigcode; 380 regs->tf_eflags &= ~PSL_T; 381 regs->tf_cs = _ucodesel; 382 regs->tf_ds = _udatasel; 383 regs->tf_es = _udatasel; 384 regs->tf_fs = _udatasel; 385 load_gs(_udatasel); 386 regs->tf_ss = _udatasel; 387 PROC_LOCK(p); 388 mtx_lock(&psp->ps_mtx); 389 } 390 #endif /* COMPAT_43 */ 391 392 #ifdef COMPAT_FREEBSD4 393 static void 394 freebsd4_sendsig(catcher, sig, mask, code) 395 sig_t catcher; 396 int sig; 397 sigset_t *mask; 398 u_long code; 399 { 400 struct sigframe4 sf, *sfp; 401 struct proc *p; 402 struct thread *td; 403 struct sigacts *psp; 404 struct trapframe *regs; 405 int oonstack; 406 407 td = curthread; 408 p = td->td_proc; 409 PROC_LOCK_ASSERT(p, MA_OWNED); 410 psp = p->p_sigacts; 411 mtx_assert(&psp->ps_mtx, MA_OWNED); 412 regs = td->td_frame; 413 oonstack = sigonstack(regs->tf_esp); 414 415 /* Save user context. */ 416 bzero(&sf, sizeof(sf)); 417 sf.sf_uc.uc_sigmask = *mask; 418 sf.sf_uc.uc_stack = td->td_sigstk; 419 sf.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK) 420 ? ((oonstack) ? SS_ONSTACK : 0) : SS_DISABLE; 421 sf.sf_uc.uc_mcontext.mc_onstack = (oonstack) ? 1 : 0; 422 sf.sf_uc.uc_mcontext.mc_gs = rgs(); 423 bcopy(regs, &sf.sf_uc.uc_mcontext.mc_fs, sizeof(*regs)); 424 425 /* Allocate space for the signal handler context. */ 426 if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack && 427 SIGISMEMBER(psp->ps_sigonstack, sig)) { 428 sfp = (struct sigframe4 *)(td->td_sigstk.ss_sp + 429 td->td_sigstk.ss_size - sizeof(struct sigframe4)); 430 #if defined(COMPAT_43) 431 td->td_sigstk.ss_flags |= SS_ONSTACK; 432 #endif 433 } else 434 sfp = (struct sigframe4 *)regs->tf_esp - 1; 435 436 /* Translate the signal if appropriate. */ 437 if (p->p_sysent->sv_sigtbl && sig <= p->p_sysent->sv_sigsize) 438 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)]; 439 440 /* Build the argument list for the signal handler. */ 441 sf.sf_signum = sig; 442 sf.sf_ucontext = (register_t)&sfp->sf_uc; 443 if (SIGISMEMBER(psp->ps_siginfo, sig)) { 444 /* Signal handler installed with SA_SIGINFO. */ 445 sf.sf_siginfo = (register_t)&sfp->sf_si; 446 sf.sf_ahu.sf_action = (__siginfohandler_t *)catcher; 447 448 /* Fill in POSIX parts */ 449 sf.sf_si.si_signo = sig; 450 sf.sf_si.si_code = code; 451 sf.sf_si.si_addr = (void *)regs->tf_err; 452 } else { 453 /* Old FreeBSD-style arguments. */ 454 sf.sf_siginfo = code; 455 sf.sf_addr = regs->tf_err; 456 sf.sf_ahu.sf_handler = catcher; 457 } 458 mtx_unlock(&psp->ps_mtx); 459 PROC_UNLOCK(p); 460 461 /* 462 * If we're a vm86 process, we want to save the segment registers. 463 * We also change eflags to be our emulated eflags, not the actual 464 * eflags. 465 */ 466 if (regs->tf_eflags & PSL_VM) { 467 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs; 468 struct vm86_kernel *vm86 = &td->td_pcb->pcb_ext->ext_vm86; 469 470 sf.sf_uc.uc_mcontext.mc_gs = tf->tf_vm86_gs; 471 sf.sf_uc.uc_mcontext.mc_fs = tf->tf_vm86_fs; 472 sf.sf_uc.uc_mcontext.mc_es = tf->tf_vm86_es; 473 sf.sf_uc.uc_mcontext.mc_ds = tf->tf_vm86_ds; 474 475 if (vm86->vm86_has_vme == 0) 476 sf.sf_uc.uc_mcontext.mc_eflags = 477 (tf->tf_eflags & ~(PSL_VIF | PSL_VIP)) | 478 (vm86->vm86_eflags & (PSL_VIF | PSL_VIP)); 479 480 /* 481 * Clear PSL_NT to inhibit T_TSSFLT faults on return from 482 * syscalls made by the signal handler. This just avoids 483 * wasting time for our lazy fixup of such faults. PSL_NT 484 * does nothing in vm86 mode, but vm86 programs can set it 485 * almost legitimately in probes for old cpu types. 486 */ 487 tf->tf_eflags &= ~(PSL_VM | PSL_NT | PSL_VIF | PSL_VIP); 488 } 489 490 /* 491 * Copy the sigframe out to the user's stack. 492 */ 493 if (copyout(&sf, sfp, sizeof(*sfp)) != 0) { 494 #ifdef DEBUG 495 printf("process %ld has trashed its stack\n", (long)p->p_pid); 496 #endif 497 PROC_LOCK(p); 498 sigexit(td, SIGILL); 499 } 500 501 regs->tf_esp = (int)sfp; 502 regs->tf_eip = PS_STRINGS - szfreebsd4_sigcode; 503 regs->tf_eflags &= ~PSL_T; 504 regs->tf_cs = _ucodesel; 505 regs->tf_ds = _udatasel; 506 regs->tf_es = _udatasel; 507 regs->tf_fs = _udatasel; 508 regs->tf_ss = _udatasel; 509 PROC_LOCK(p); 510 mtx_lock(&psp->ps_mtx); 511 } 512 #endif /* COMPAT_FREEBSD4 */ 513 514 void 515 sendsig(catcher, sig, mask, code) 516 sig_t catcher; 517 int sig; 518 sigset_t *mask; 519 u_long code; 520 { 521 struct sigframe sf, *sfp; 522 struct proc *p; 523 struct thread *td; 524 struct sigacts *psp; 525 char *sp; 526 struct trapframe *regs; 527 int oonstack; 528 529 td = curthread; 530 p = td->td_proc; 531 PROC_LOCK_ASSERT(p, MA_OWNED); 532 psp = p->p_sigacts; 533 mtx_assert(&psp->ps_mtx, MA_OWNED); 534 #ifdef COMPAT_FREEBSD4 535 if (SIGISMEMBER(psp->ps_freebsd4, sig)) { 536 freebsd4_sendsig(catcher, sig, mask, code); 537 return; 538 } 539 #endif 540 #ifdef COMPAT_43 541 if (SIGISMEMBER(psp->ps_osigset, sig)) { 542 osendsig(catcher, sig, mask, code); 543 return; 544 } 545 #endif 546 regs = td->td_frame; 547 oonstack = sigonstack(regs->tf_esp); 548 549 /* Save user context. */ 550 bzero(&sf, sizeof(sf)); 551 sf.sf_uc.uc_sigmask = *mask; 552 sf.sf_uc.uc_stack = td->td_sigstk; 553 sf.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK) 554 ? ((oonstack) ? SS_ONSTACK : 0) : SS_DISABLE; 555 sf.sf_uc.uc_mcontext.mc_onstack = (oonstack) ? 1 : 0; 556 sf.sf_uc.uc_mcontext.mc_gs = rgs(); 557 bcopy(regs, &sf.sf_uc.uc_mcontext.mc_fs, sizeof(*regs)); 558 sf.sf_uc.uc_mcontext.mc_len = sizeof(sf.sf_uc.uc_mcontext); /* magic */ 559 get_fpcontext(td, &sf.sf_uc.uc_mcontext); 560 fpstate_drop(td); 561 562 /* Allocate space for the signal handler context. */ 563 if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack && 564 SIGISMEMBER(psp->ps_sigonstack, sig)) { 565 sp = td->td_sigstk.ss_sp + 566 td->td_sigstk.ss_size - sizeof(struct sigframe); 567 #if defined(COMPAT_43) 568 td->td_sigstk.ss_flags |= SS_ONSTACK; 569 #endif 570 } else 571 sp = (char *)regs->tf_esp - sizeof(struct sigframe); 572 /* Align to 16 bytes. */ 573 sfp = (struct sigframe *)((unsigned int)sp & ~0xF); 574 575 /* Translate the signal if appropriate. */ 576 if (p->p_sysent->sv_sigtbl && sig <= p->p_sysent->sv_sigsize) 577 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)]; 578 579 /* Build the argument list for the signal handler. */ 580 sf.sf_signum = sig; 581 sf.sf_ucontext = (register_t)&sfp->sf_uc; 582 if (SIGISMEMBER(psp->ps_siginfo, sig)) { 583 /* Signal handler installed with SA_SIGINFO. */ 584 sf.sf_siginfo = (register_t)&sfp->sf_si; 585 sf.sf_ahu.sf_action = (__siginfohandler_t *)catcher; 586 587 /* Fill in POSIX parts */ 588 sf.sf_si.si_signo = sig; 589 sf.sf_si.si_code = code; 590 sf.sf_si.si_addr = (void *)regs->tf_err; 591 } else { 592 /* Old FreeBSD-style arguments. */ 593 sf.sf_siginfo = code; 594 sf.sf_addr = regs->tf_err; 595 sf.sf_ahu.sf_handler = catcher; 596 } 597 mtx_unlock(&psp->ps_mtx); 598 PROC_UNLOCK(p); 599 600 /* 601 * If we're a vm86 process, we want to save the segment registers. 602 * We also change eflags to be our emulated eflags, not the actual 603 * eflags. 604 */ 605 if (regs->tf_eflags & PSL_VM) { 606 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs; 607 struct vm86_kernel *vm86 = &td->td_pcb->pcb_ext->ext_vm86; 608 609 sf.sf_uc.uc_mcontext.mc_gs = tf->tf_vm86_gs; 610 sf.sf_uc.uc_mcontext.mc_fs = tf->tf_vm86_fs; 611 sf.sf_uc.uc_mcontext.mc_es = tf->tf_vm86_es; 612 sf.sf_uc.uc_mcontext.mc_ds = tf->tf_vm86_ds; 613 614 if (vm86->vm86_has_vme == 0) 615 sf.sf_uc.uc_mcontext.mc_eflags = 616 (tf->tf_eflags & ~(PSL_VIF | PSL_VIP)) | 617 (vm86->vm86_eflags & (PSL_VIF | PSL_VIP)); 618 619 /* 620 * Clear PSL_NT to inhibit T_TSSFLT faults on return from 621 * syscalls made by the signal handler. This just avoids 622 * wasting time for our lazy fixup of such faults. PSL_NT 623 * does nothing in vm86 mode, but vm86 programs can set it 624 * almost legitimately in probes for old cpu types. 625 */ 626 tf->tf_eflags &= ~(PSL_VM | PSL_NT | PSL_VIF | PSL_VIP); 627 } 628 629 /* 630 * Copy the sigframe out to the user's stack. 631 */ 632 if (copyout(&sf, sfp, sizeof(*sfp)) != 0) { 633 #ifdef DEBUG 634 printf("process %ld has trashed its stack\n", (long)p->p_pid); 635 #endif 636 PROC_LOCK(p); 637 sigexit(td, SIGILL); 638 } 639 640 regs->tf_esp = (int)sfp; 641 regs->tf_eip = PS_STRINGS - *(p->p_sysent->sv_szsigcode); 642 regs->tf_eflags &= ~PSL_T; 643 regs->tf_cs = _ucodesel; 644 regs->tf_ds = _udatasel; 645 regs->tf_es = _udatasel; 646 regs->tf_fs = _udatasel; 647 regs->tf_ss = _udatasel; 648 PROC_LOCK(p); 649 mtx_lock(&psp->ps_mtx); 650 } 651 652 /* 653 * Build siginfo_t for SA thread 654 */ 655 void 656 cpu_thread_siginfo(int sig, u_long code, siginfo_t *si) 657 { 658 struct proc *p; 659 struct thread *td; 660 661 td = curthread; 662 p = td->td_proc; 663 PROC_LOCK_ASSERT(p, MA_OWNED); 664 665 bzero(si, sizeof(*si)); 666 si->si_signo = sig; 667 si->si_code = code; 668 si->si_addr = (void *)td->td_frame->tf_err; 669 /* XXXKSE fill other fields */ 670 } 671 672 /* 673 * System call to cleanup state after a signal 674 * has been taken. Reset signal mask and 675 * stack state from context left by sendsig (above). 676 * Return to previous pc and psl as specified by 677 * context left by sendsig. Check carefully to 678 * make sure that the user has not modified the 679 * state to gain improper privileges. 680 * 681 * MPSAFE 682 */ 683 #ifdef COMPAT_43 684 int 685 osigreturn(td, uap) 686 struct thread *td; 687 struct osigreturn_args /* { 688 struct osigcontext *sigcntxp; 689 } */ *uap; 690 { 691 struct osigcontext sc; 692 struct trapframe *regs; 693 struct osigcontext *scp; 694 struct proc *p = td->td_proc; 695 int eflags, error; 696 697 regs = td->td_frame; 698 error = copyin(uap->sigcntxp, &sc, sizeof(sc)); 699 if (error != 0) 700 return (error); 701 scp = ≻ 702 eflags = scp->sc_ps; 703 if (eflags & PSL_VM) { 704 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs; 705 struct vm86_kernel *vm86; 706 707 /* 708 * if pcb_ext == 0 or vm86_inited == 0, the user hasn't 709 * set up the vm86 area, and we can't enter vm86 mode. 710 */ 711 if (td->td_pcb->pcb_ext == 0) 712 return (EINVAL); 713 vm86 = &td->td_pcb->pcb_ext->ext_vm86; 714 if (vm86->vm86_inited == 0) 715 return (EINVAL); 716 717 /* Go back to user mode if both flags are set. */ 718 if ((eflags & PSL_VIP) && (eflags & PSL_VIF)) 719 trapsignal(td, SIGBUS, 0); 720 721 if (vm86->vm86_has_vme) { 722 eflags = (tf->tf_eflags & ~VME_USERCHANGE) | 723 (eflags & VME_USERCHANGE) | PSL_VM; 724 } else { 725 vm86->vm86_eflags = eflags; /* save VIF, VIP */ 726 eflags = (tf->tf_eflags & ~VM_USERCHANGE) | 727 (eflags & VM_USERCHANGE) | PSL_VM; 728 } 729 tf->tf_vm86_ds = scp->sc_ds; 730 tf->tf_vm86_es = scp->sc_es; 731 tf->tf_vm86_fs = scp->sc_fs; 732 tf->tf_vm86_gs = scp->sc_gs; 733 tf->tf_ds = _udatasel; 734 tf->tf_es = _udatasel; 735 tf->tf_fs = _udatasel; 736 } else { 737 /* 738 * Don't allow users to change privileged or reserved flags. 739 */ 740 /* 741 * XXX do allow users to change the privileged flag PSL_RF. 742 * The cpu sets PSL_RF in tf_eflags for faults. Debuggers 743 * should sometimes set it there too. tf_eflags is kept in 744 * the signal context during signal handling and there is no 745 * other place to remember it, so the PSL_RF bit may be 746 * corrupted by the signal handler without us knowing. 747 * Corruption of the PSL_RF bit at worst causes one more or 748 * one less debugger trap, so allowing it is fairly harmless. 749 */ 750 if (!EFL_SECURE(eflags & ~PSL_RF, regs->tf_eflags & ~PSL_RF)) { 751 return (EINVAL); 752 } 753 754 /* 755 * Don't allow users to load a valid privileged %cs. Let the 756 * hardware check for invalid selectors, excess privilege in 757 * other selectors, invalid %eip's and invalid %esp's. 758 */ 759 if (!CS_SECURE(scp->sc_cs)) { 760 trapsignal(td, SIGBUS, T_PROTFLT); 761 return (EINVAL); 762 } 763 regs->tf_ds = scp->sc_ds; 764 regs->tf_es = scp->sc_es; 765 regs->tf_fs = scp->sc_fs; 766 } 767 768 /* Restore remaining registers. */ 769 regs->tf_eax = scp->sc_eax; 770 regs->tf_ebx = scp->sc_ebx; 771 regs->tf_ecx = scp->sc_ecx; 772 regs->tf_edx = scp->sc_edx; 773 regs->tf_esi = scp->sc_esi; 774 regs->tf_edi = scp->sc_edi; 775 regs->tf_cs = scp->sc_cs; 776 regs->tf_ss = scp->sc_ss; 777 regs->tf_isp = scp->sc_isp; 778 regs->tf_ebp = scp->sc_fp; 779 regs->tf_esp = scp->sc_sp; 780 regs->tf_eip = scp->sc_pc; 781 regs->tf_eflags = eflags; 782 783 PROC_LOCK(p); 784 #if defined(COMPAT_43) 785 if (scp->sc_onstack & 1) 786 td->td_sigstk.ss_flags |= SS_ONSTACK; 787 else 788 td->td_sigstk.ss_flags &= ~SS_ONSTACK; 789 #endif 790 SIGSETOLD(td->td_sigmask, scp->sc_mask); 791 SIG_CANTMASK(td->td_sigmask); 792 signotify(td); 793 PROC_UNLOCK(p); 794 return (EJUSTRETURN); 795 } 796 #endif /* COMPAT_43 */ 797 798 #ifdef COMPAT_FREEBSD4 799 /* 800 * MPSAFE 801 */ 802 int 803 freebsd4_sigreturn(td, uap) 804 struct thread *td; 805 struct freebsd4_sigreturn_args /* { 806 const ucontext4 *sigcntxp; 807 } */ *uap; 808 { 809 struct ucontext4 uc; 810 struct proc *p = td->td_proc; 811 struct trapframe *regs; 812 const struct ucontext4 *ucp; 813 int cs, eflags, error; 814 815 error = copyin(uap->sigcntxp, &uc, sizeof(uc)); 816 if (error != 0) 817 return (error); 818 ucp = &uc; 819 regs = td->td_frame; 820 eflags = ucp->uc_mcontext.mc_eflags; 821 if (eflags & PSL_VM) { 822 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs; 823 struct vm86_kernel *vm86; 824 825 /* 826 * if pcb_ext == 0 or vm86_inited == 0, the user hasn't 827 * set up the vm86 area, and we can't enter vm86 mode. 828 */ 829 if (td->td_pcb->pcb_ext == 0) 830 return (EINVAL); 831 vm86 = &td->td_pcb->pcb_ext->ext_vm86; 832 if (vm86->vm86_inited == 0) 833 return (EINVAL); 834 835 /* Go back to user mode if both flags are set. */ 836 if ((eflags & PSL_VIP) && (eflags & PSL_VIF)) 837 trapsignal(td, SIGBUS, 0); 838 839 if (vm86->vm86_has_vme) { 840 eflags = (tf->tf_eflags & ~VME_USERCHANGE) | 841 (eflags & VME_USERCHANGE) | PSL_VM; 842 } else { 843 vm86->vm86_eflags = eflags; /* save VIF, VIP */ 844 eflags = (tf->tf_eflags & ~VM_USERCHANGE) | 845 (eflags & VM_USERCHANGE) | PSL_VM; 846 } 847 bcopy(&ucp->uc_mcontext.mc_fs, tf, sizeof(struct trapframe)); 848 tf->tf_eflags = eflags; 849 tf->tf_vm86_ds = tf->tf_ds; 850 tf->tf_vm86_es = tf->tf_es; 851 tf->tf_vm86_fs = tf->tf_fs; 852 tf->tf_vm86_gs = ucp->uc_mcontext.mc_gs; 853 tf->tf_ds = _udatasel; 854 tf->tf_es = _udatasel; 855 tf->tf_fs = _udatasel; 856 } else { 857 /* 858 * Don't allow users to change privileged or reserved flags. 859 */ 860 /* 861 * XXX do allow users to change the privileged flag PSL_RF. 862 * The cpu sets PSL_RF in tf_eflags for faults. Debuggers 863 * should sometimes set it there too. tf_eflags is kept in 864 * the signal context during signal handling and there is no 865 * other place to remember it, so the PSL_RF bit may be 866 * corrupted by the signal handler without us knowing. 867 * Corruption of the PSL_RF bit at worst causes one more or 868 * one less debugger trap, so allowing it is fairly harmless. 869 */ 870 if (!EFL_SECURE(eflags & ~PSL_RF, regs->tf_eflags & ~PSL_RF)) { 871 printf("freebsd4_sigreturn: eflags = 0x%x\n", eflags); 872 return (EINVAL); 873 } 874 875 /* 876 * Don't allow users to load a valid privileged %cs. Let the 877 * hardware check for invalid selectors, excess privilege in 878 * other selectors, invalid %eip's and invalid %esp's. 879 */ 880 cs = ucp->uc_mcontext.mc_cs; 881 if (!CS_SECURE(cs)) { 882 printf("freebsd4_sigreturn: cs = 0x%x\n", cs); 883 trapsignal(td, SIGBUS, T_PROTFLT); 884 return (EINVAL); 885 } 886 887 bcopy(&ucp->uc_mcontext.mc_fs, regs, sizeof(*regs)); 888 } 889 890 PROC_LOCK(p); 891 #if defined(COMPAT_43) 892 if (ucp->uc_mcontext.mc_onstack & 1) 893 td->td_sigstk.ss_flags |= SS_ONSTACK; 894 else 895 td->td_sigstk.ss_flags &= ~SS_ONSTACK; 896 #endif 897 898 td->td_sigmask = ucp->uc_sigmask; 899 SIG_CANTMASK(td->td_sigmask); 900 signotify(td); 901 PROC_UNLOCK(p); 902 return (EJUSTRETURN); 903 } 904 #endif /* COMPAT_FREEBSD4 */ 905 906 /* 907 * MPSAFE 908 */ 909 int 910 sigreturn(td, uap) 911 struct thread *td; 912 struct sigreturn_args /* { 913 const __ucontext *sigcntxp; 914 } */ *uap; 915 { 916 ucontext_t uc; 917 struct proc *p = td->td_proc; 918 struct trapframe *regs; 919 const ucontext_t *ucp; 920 int cs, eflags, error, ret; 921 922 error = copyin(uap->sigcntxp, &uc, sizeof(uc)); 923 if (error != 0) 924 return (error); 925 ucp = &uc; 926 regs = td->td_frame; 927 eflags = ucp->uc_mcontext.mc_eflags; 928 if (eflags & PSL_VM) { 929 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs; 930 struct vm86_kernel *vm86; 931 932 /* 933 * if pcb_ext == 0 or vm86_inited == 0, the user hasn't 934 * set up the vm86 area, and we can't enter vm86 mode. 935 */ 936 if (td->td_pcb->pcb_ext == 0) 937 return (EINVAL); 938 vm86 = &td->td_pcb->pcb_ext->ext_vm86; 939 if (vm86->vm86_inited == 0) 940 return (EINVAL); 941 942 /* Go back to user mode if both flags are set. */ 943 if ((eflags & PSL_VIP) && (eflags & PSL_VIF)) 944 trapsignal(td, SIGBUS, 0); 945 946 if (vm86->vm86_has_vme) { 947 eflags = (tf->tf_eflags & ~VME_USERCHANGE) | 948 (eflags & VME_USERCHANGE) | PSL_VM; 949 } else { 950 vm86->vm86_eflags = eflags; /* save VIF, VIP */ 951 eflags = (tf->tf_eflags & ~VM_USERCHANGE) | 952 (eflags & VM_USERCHANGE) | PSL_VM; 953 } 954 bcopy(&ucp->uc_mcontext.mc_fs, tf, sizeof(struct trapframe)); 955 tf->tf_eflags = eflags; 956 tf->tf_vm86_ds = tf->tf_ds; 957 tf->tf_vm86_es = tf->tf_es; 958 tf->tf_vm86_fs = tf->tf_fs; 959 tf->tf_vm86_gs = ucp->uc_mcontext.mc_gs; 960 tf->tf_ds = _udatasel; 961 tf->tf_es = _udatasel; 962 tf->tf_fs = _udatasel; 963 } else { 964 /* 965 * Don't allow users to change privileged or reserved flags. 966 */ 967 /* 968 * XXX do allow users to change the privileged flag PSL_RF. 969 * The cpu sets PSL_RF in tf_eflags for faults. Debuggers 970 * should sometimes set it there too. tf_eflags is kept in 971 * the signal context during signal handling and there is no 972 * other place to remember it, so the PSL_RF bit may be 973 * corrupted by the signal handler without us knowing. 974 * Corruption of the PSL_RF bit at worst causes one more or 975 * one less debugger trap, so allowing it is fairly harmless. 976 */ 977 if (!EFL_SECURE(eflags & ~PSL_RF, regs->tf_eflags & ~PSL_RF)) { 978 printf("sigreturn: eflags = 0x%x\n", eflags); 979 return (EINVAL); 980 } 981 982 /* 983 * Don't allow users to load a valid privileged %cs. Let the 984 * hardware check for invalid selectors, excess privilege in 985 * other selectors, invalid %eip's and invalid %esp's. 986 */ 987 cs = ucp->uc_mcontext.mc_cs; 988 if (!CS_SECURE(cs)) { 989 printf("sigreturn: cs = 0x%x\n", cs); 990 trapsignal(td, SIGBUS, T_PROTFLT); 991 return (EINVAL); 992 } 993 994 ret = set_fpcontext(td, &ucp->uc_mcontext); 995 if (ret != 0) 996 return (ret); 997 bcopy(&ucp->uc_mcontext.mc_fs, regs, sizeof(*regs)); 998 } 999 1000 PROC_LOCK(p); 1001 #if defined(COMPAT_43) 1002 if (ucp->uc_mcontext.mc_onstack & 1) 1003 td->td_sigstk.ss_flags |= SS_ONSTACK; 1004 else 1005 td->td_sigstk.ss_flags &= ~SS_ONSTACK; 1006 #endif 1007 1008 td->td_sigmask = ucp->uc_sigmask; 1009 SIG_CANTMASK(td->td_sigmask); 1010 signotify(td); 1011 PROC_UNLOCK(p); 1012 return (EJUSTRETURN); 1013 } 1014 1015 /* 1016 * Machine dependent boot() routine 1017 * 1018 * I haven't seen anything to put here yet 1019 * Possibly some stuff might be grafted back here from boot() 1020 */ 1021 void 1022 cpu_boot(int howto) 1023 { 1024 } 1025 1026 /* Get current clock frequency for the given cpu id. */ 1027 int 1028 cpu_est_clockrate(int cpu_id, uint64_t *rate) 1029 { 1030 register_t reg; 1031 uint64_t tsc1, tsc2; 1032 1033 if (pcpu_find(cpu_id) == NULL || rate == NULL) 1034 return (EINVAL); 1035 if (!tsc_present) 1036 return (EOPNOTSUPP); 1037 1038 /* If we're booting, trust the rate calibrated moments ago. */ 1039 if (cold) { 1040 *rate = tsc_freq; 1041 return (0); 1042 } 1043 1044 #ifdef SMP 1045 /* Schedule ourselves on the indicated cpu. */ 1046 mtx_lock_spin(&sched_lock); 1047 sched_bind(curthread, cpu_id); 1048 mtx_unlock_spin(&sched_lock); 1049 #endif 1050 1051 /* Calibrate by measuring a short delay. */ 1052 reg = intr_disable(); 1053 tsc1 = rdtsc(); 1054 DELAY(1000); 1055 tsc2 = rdtsc(); 1056 intr_restore(reg); 1057 1058 #ifdef SMP 1059 mtx_lock_spin(&sched_lock); 1060 sched_unbind(curthread); 1061 mtx_unlock_spin(&sched_lock); 1062 #endif 1063 1064 /* 1065 * Calculate the difference in readings, convert to Mhz, and 1066 * subtract 0.5% of the total. Empirical testing has shown that 1067 * overhead in DELAY() works out to approximately this value. 1068 */ 1069 tsc2 -= tsc1; 1070 *rate = tsc2 * 1000 - tsc2 * 5; 1071 return (0); 1072 } 1073 1074 /* 1075 * Shutdown the CPU as much as possible 1076 */ 1077 void 1078 cpu_halt(void) 1079 { 1080 for (;;) 1081 __asm__ ("hlt"); 1082 } 1083 1084 /* 1085 * Hook to idle the CPU when possible. In the SMP case we default to 1086 * off because a halted cpu will not currently pick up a new thread in the 1087 * run queue until the next timer tick. If turned on this will result in 1088 * approximately a 4.2% loss in real time performance in buildworld tests 1089 * (but improves user and sys times oddly enough), and saves approximately 1090 * 5% in power consumption on an idle machine (tests w/2xCPU 1.1GHz P3). 1091 * 1092 * XXX we need to have a cpu mask of idle cpus and generate an IPI or 1093 * otherwise generate some sort of interrupt to wake up cpus sitting in HLT. 1094 * Then we can have our cake and eat it too. 1095 * 1096 * XXX I'm turning it on for SMP as well by default for now. It seems to 1097 * help lock contention somewhat, and this is critical for HTT. -Peter 1098 */ 1099 static int cpu_idle_hlt = 1; 1100 SYSCTL_INT(_machdep, OID_AUTO, cpu_idle_hlt, CTLFLAG_RW, 1101 &cpu_idle_hlt, 0, "Idle loop HLT enable"); 1102 1103 static void 1104 cpu_idle_default(void) 1105 { 1106 /* 1107 * we must absolutely guarentee that hlt is the 1108 * absolute next instruction after sti or we 1109 * introduce a timing window. 1110 */ 1111 __asm __volatile("sti; hlt"); 1112 } 1113 1114 /* 1115 * Note that we have to be careful here to avoid a race between checking 1116 * sched_runnable() and actually halting. If we don't do this, we may waste 1117 * the time between calling hlt and the next interrupt even though there 1118 * is a runnable process. 1119 */ 1120 void 1121 cpu_idle(void) 1122 { 1123 1124 #ifdef SMP 1125 if (mp_grab_cpu_hlt()) 1126 return; 1127 #endif 1128 1129 if (cpu_idle_hlt) { 1130 disable_intr(); 1131 if (sched_runnable()) 1132 enable_intr(); 1133 else 1134 (*cpu_idle_hook)(); 1135 } 1136 } 1137 1138 /* Other subsystems (e.g., ACPI) can hook this later. */ 1139 void (*cpu_idle_hook)(void) = cpu_idle_default; 1140 1141 /* 1142 * Clear registers on exec 1143 */ 1144 void 1145 exec_setregs(td, entry, stack, ps_strings) 1146 struct thread *td; 1147 u_long entry; 1148 u_long stack; 1149 u_long ps_strings; 1150 { 1151 struct trapframe *regs = td->td_frame; 1152 struct pcb *pcb = td->td_pcb; 1153 1154 /* Reset pc->pcb_gs and %gs before possibly invalidating it. */ 1155 pcb->pcb_gs = _udatasel; 1156 load_gs(_udatasel); 1157 1158 if (td->td_proc->p_md.md_ldt) 1159 user_ldt_free(td); 1160 1161 bzero((char *)regs, sizeof(struct trapframe)); 1162 regs->tf_eip = entry; 1163 regs->tf_esp = stack; 1164 regs->tf_eflags = PSL_USER | (regs->tf_eflags & PSL_T); 1165 regs->tf_ss = _udatasel; 1166 regs->tf_ds = _udatasel; 1167 regs->tf_es = _udatasel; 1168 regs->tf_fs = _udatasel; 1169 regs->tf_cs = _ucodesel; 1170 1171 /* PS_STRINGS value for BSD/OS binaries. It is 0 for non-BSD/OS. */ 1172 regs->tf_ebx = ps_strings; 1173 1174 /* 1175 * Reset the hardware debug registers if they were in use. 1176 * They won't have any meaning for the newly exec'd process. 1177 */ 1178 if (pcb->pcb_flags & PCB_DBREGS) { 1179 pcb->pcb_dr0 = 0; 1180 pcb->pcb_dr1 = 0; 1181 pcb->pcb_dr2 = 0; 1182 pcb->pcb_dr3 = 0; 1183 pcb->pcb_dr6 = 0; 1184 pcb->pcb_dr7 = 0; 1185 if (pcb == PCPU_GET(curpcb)) { 1186 /* 1187 * Clear the debug registers on the running 1188 * CPU, otherwise they will end up affecting 1189 * the next process we switch to. 1190 */ 1191 reset_dbregs(); 1192 } 1193 pcb->pcb_flags &= ~PCB_DBREGS; 1194 } 1195 1196 /* 1197 * Initialize the math emulator (if any) for the current process. 1198 * Actually, just clear the bit that says that the emulator has 1199 * been initialized. Initialization is delayed until the process 1200 * traps to the emulator (if it is done at all) mainly because 1201 * emulators don't provide an entry point for initialization. 1202 */ 1203 td->td_pcb->pcb_flags &= ~FP_SOFTFP; 1204 1205 /* 1206 * Drop the FP state if we hold it, so that the process gets a 1207 * clean FP state if it uses the FPU again. 1208 */ 1209 fpstate_drop(td); 1210 1211 /* 1212 * XXX - Linux emulator 1213 * Make sure sure edx is 0x0 on entry. Linux binaries depend 1214 * on it. 1215 */ 1216 td->td_retval[1] = 0; 1217 } 1218 1219 void 1220 cpu_setregs(void) 1221 { 1222 unsigned int cr0; 1223 1224 cr0 = rcr0(); 1225 /* 1226 * CR0_MP, CR0_NE and CR0_TS are also set by npx_probe() for the 1227 * BSP. See the comments there about why we set them. 1228 */ 1229 cr0 |= CR0_MP | CR0_NE | CR0_TS | CR0_WP | CR0_AM; 1230 load_cr0(cr0); 1231 load_gs(_udatasel); 1232 } 1233 1234 static int 1235 sysctl_machdep_adjkerntz(SYSCTL_HANDLER_ARGS) 1236 { 1237 int error; 1238 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, 1239 req); 1240 if (!error && req->newptr) 1241 resettodr(); 1242 return (error); 1243 } 1244 1245 SYSCTL_PROC(_machdep, CPU_ADJKERNTZ, adjkerntz, CTLTYPE_INT|CTLFLAG_RW, 1246 &adjkerntz, 0, sysctl_machdep_adjkerntz, "I", ""); 1247 1248 SYSCTL_INT(_machdep, CPU_DISRTCSET, disable_rtc_set, 1249 CTLFLAG_RW, &disable_rtc_set, 0, ""); 1250 1251 SYSCTL_STRUCT(_machdep, CPU_BOOTINFO, bootinfo, 1252 CTLFLAG_RD, &bootinfo, bootinfo, ""); 1253 1254 SYSCTL_INT(_machdep, CPU_WALLCLOCK, wall_cmos_clock, 1255 CTLFLAG_RW, &wall_cmos_clock, 0, ""); 1256 1257 u_long bootdev; /* not a struct cdev *- encoding is different */ 1258 SYSCTL_ULONG(_machdep, OID_AUTO, guessed_bootdev, 1259 CTLFLAG_RD, &bootdev, 0, "Maybe the Boot device (not in struct cdev *format)"); 1260 1261 /* 1262 * Initialize 386 and configure to run kernel 1263 */ 1264 1265 /* 1266 * Initialize segments & interrupt table 1267 */ 1268 1269 int _default_ldt; 1270 union descriptor gdt[NGDT * MAXCPU]; /* global descriptor table */ 1271 static struct gate_descriptor idt0[NIDT]; 1272 struct gate_descriptor *idt = &idt0[0]; /* interrupt descriptor table */ 1273 union descriptor ldt[NLDT]; /* local descriptor table */ 1274 struct region_descriptor r_gdt, r_idt; /* table descriptors */ 1275 1276 int private_tss; /* flag indicating private tss */ 1277 1278 #if defined(I586_CPU) && !defined(NO_F00F_HACK) 1279 extern int has_f00f_bug; 1280 #endif 1281 1282 static struct i386tss dblfault_tss; 1283 static char dblfault_stack[PAGE_SIZE]; 1284 1285 extern vm_offset_t proc0kstack; 1286 1287 1288 /* 1289 * software prototypes -- in more palatable form. 1290 * 1291 * GCODE_SEL through GUDATA_SEL must be in this order for syscall/sysret 1292 * GUFS_SEL and GUGS_SEL must be in this order (swtch.s knows it) 1293 */ 1294 struct soft_segment_descriptor gdt_segs[] = { 1295 /* GNULL_SEL 0 Null Descriptor */ 1296 { 0x0, /* segment base address */ 1297 0x0, /* length */ 1298 0, /* segment type */ 1299 0, /* segment descriptor priority level */ 1300 0, /* segment descriptor present */ 1301 0, 0, 1302 0, /* default 32 vs 16 bit size */ 1303 0 /* limit granularity (byte/page units)*/ }, 1304 /* GPRIV_SEL 1 SMP Per-Processor Private Data Descriptor */ 1305 { 0x0, /* segment base address */ 1306 0xfffff, /* length - all address space */ 1307 SDT_MEMRWA, /* segment type */ 1308 0, /* segment descriptor priority level */ 1309 1, /* segment descriptor present */ 1310 0, 0, 1311 1, /* default 32 vs 16 bit size */ 1312 1 /* limit granularity (byte/page units)*/ }, 1313 /* GUFS_SEL 2 %fs Descriptor for user */ 1314 { 0x0, /* segment base address */ 1315 0xfffff, /* length - all address space */ 1316 SDT_MEMRWA, /* segment type */ 1317 SEL_UPL, /* segment descriptor priority level */ 1318 1, /* segment descriptor present */ 1319 0, 0, 1320 1, /* default 32 vs 16 bit size */ 1321 1 /* limit granularity (byte/page units)*/ }, 1322 /* GUGS_SEL 3 %gs Descriptor for user */ 1323 { 0x0, /* segment base address */ 1324 0xfffff, /* length - all address space */ 1325 SDT_MEMRWA, /* segment type */ 1326 SEL_UPL, /* segment descriptor priority level */ 1327 1, /* segment descriptor present */ 1328 0, 0, 1329 1, /* default 32 vs 16 bit size */ 1330 1 /* limit granularity (byte/page units)*/ }, 1331 /* GCODE_SEL 4 Code Descriptor for kernel */ 1332 { 0x0, /* segment base address */ 1333 0xfffff, /* length - all address space */ 1334 SDT_MEMERA, /* segment type */ 1335 0, /* segment descriptor priority level */ 1336 1, /* segment descriptor present */ 1337 0, 0, 1338 1, /* default 32 vs 16 bit size */ 1339 1 /* limit granularity (byte/page units)*/ }, 1340 /* GDATA_SEL 5 Data Descriptor for kernel */ 1341 { 0x0, /* segment base address */ 1342 0xfffff, /* length - all address space */ 1343 SDT_MEMRWA, /* segment type */ 1344 0, /* segment descriptor priority level */ 1345 1, /* segment descriptor present */ 1346 0, 0, 1347 1, /* default 32 vs 16 bit size */ 1348 1 /* limit granularity (byte/page units)*/ }, 1349 /* GUCODE_SEL 6 Code Descriptor for user */ 1350 { 0x0, /* segment base address */ 1351 0xfffff, /* length - all address space */ 1352 SDT_MEMERA, /* segment type */ 1353 SEL_UPL, /* segment descriptor priority level */ 1354 1, /* segment descriptor present */ 1355 0, 0, 1356 1, /* default 32 vs 16 bit size */ 1357 1 /* limit granularity (byte/page units)*/ }, 1358 /* GUDATA_SEL 7 Data Descriptor for user */ 1359 { 0x0, /* segment base address */ 1360 0xfffff, /* length - all address space */ 1361 SDT_MEMRWA, /* segment type */ 1362 SEL_UPL, /* segment descriptor priority level */ 1363 1, /* segment descriptor present */ 1364 0, 0, 1365 1, /* default 32 vs 16 bit size */ 1366 1 /* limit granularity (byte/page units)*/ }, 1367 /* GBIOSLOWMEM_SEL 8 BIOS access to realmode segment 0x40, must be #8 in GDT */ 1368 { 0x400, /* segment base address */ 1369 0xfffff, /* length */ 1370 SDT_MEMRWA, /* segment type */ 1371 0, /* segment descriptor priority level */ 1372 1, /* segment descriptor present */ 1373 0, 0, 1374 1, /* default 32 vs 16 bit size */ 1375 1 /* limit granularity (byte/page units)*/ }, 1376 /* GPROC0_SEL 9 Proc 0 Tss Descriptor */ 1377 { 1378 0x0, /* segment base address */ 1379 sizeof(struct i386tss)-1,/* length */ 1380 SDT_SYS386TSS, /* segment type */ 1381 0, /* segment descriptor priority level */ 1382 1, /* segment descriptor present */ 1383 0, 0, 1384 0, /* unused - default 32 vs 16 bit size */ 1385 0 /* limit granularity (byte/page units)*/ }, 1386 /* GLDT_SEL 10 LDT Descriptor */ 1387 { (int) ldt, /* segment base address */ 1388 sizeof(ldt)-1, /* length - all address space */ 1389 SDT_SYSLDT, /* segment type */ 1390 SEL_UPL, /* segment descriptor priority level */ 1391 1, /* segment descriptor present */ 1392 0, 0, 1393 0, /* unused - default 32 vs 16 bit size */ 1394 0 /* limit granularity (byte/page units)*/ }, 1395 /* GUSERLDT_SEL 11 User LDT Descriptor per process */ 1396 { (int) ldt, /* segment base address */ 1397 (512 * sizeof(union descriptor)-1), /* length */ 1398 SDT_SYSLDT, /* segment type */ 1399 0, /* segment descriptor priority level */ 1400 1, /* segment descriptor present */ 1401 0, 0, 1402 0, /* unused - default 32 vs 16 bit size */ 1403 0 /* limit granularity (byte/page units)*/ }, 1404 /* GPANIC_SEL 12 Panic Tss Descriptor */ 1405 { (int) &dblfault_tss, /* segment base address */ 1406 sizeof(struct i386tss)-1,/* length - all address space */ 1407 SDT_SYS386TSS, /* segment type */ 1408 0, /* segment descriptor priority level */ 1409 1, /* segment descriptor present */ 1410 0, 0, 1411 0, /* unused - default 32 vs 16 bit size */ 1412 0 /* limit granularity (byte/page units)*/ }, 1413 /* GBIOSCODE32_SEL 13 BIOS 32-bit interface (32bit Code) */ 1414 { 0, /* segment base address (overwritten) */ 1415 0xfffff, /* length */ 1416 SDT_MEMERA, /* segment type */ 1417 0, /* segment descriptor priority level */ 1418 1, /* segment descriptor present */ 1419 0, 0, 1420 0, /* default 32 vs 16 bit size */ 1421 1 /* limit granularity (byte/page units)*/ }, 1422 /* GBIOSCODE16_SEL 14 BIOS 32-bit interface (16bit Code) */ 1423 { 0, /* segment base address (overwritten) */ 1424 0xfffff, /* length */ 1425 SDT_MEMERA, /* segment type */ 1426 0, /* segment descriptor priority level */ 1427 1, /* segment descriptor present */ 1428 0, 0, 1429 0, /* default 32 vs 16 bit size */ 1430 1 /* limit granularity (byte/page units)*/ }, 1431 /* GBIOSDATA_SEL 15 BIOS 32-bit interface (Data) */ 1432 { 0, /* segment base address (overwritten) */ 1433 0xfffff, /* length */ 1434 SDT_MEMRWA, /* segment type */ 1435 0, /* segment descriptor priority level */ 1436 1, /* segment descriptor present */ 1437 0, 0, 1438 1, /* default 32 vs 16 bit size */ 1439 1 /* limit granularity (byte/page units)*/ }, 1440 /* GBIOSUTIL_SEL 16 BIOS 16-bit interface (Utility) */ 1441 { 0, /* segment base address (overwritten) */ 1442 0xfffff, /* length */ 1443 SDT_MEMRWA, /* segment type */ 1444 0, /* segment descriptor priority level */ 1445 1, /* segment descriptor present */ 1446 0, 0, 1447 0, /* default 32 vs 16 bit size */ 1448 1 /* limit granularity (byte/page units)*/ }, 1449 /* GBIOSARGS_SEL 17 BIOS 16-bit interface (Arguments) */ 1450 { 0, /* segment base address (overwritten) */ 1451 0xfffff, /* length */ 1452 SDT_MEMRWA, /* segment type */ 1453 0, /* segment descriptor priority level */ 1454 1, /* segment descriptor present */ 1455 0, 0, 1456 0, /* default 32 vs 16 bit size */ 1457 1 /* limit granularity (byte/page units)*/ }, 1458 /* GNDIS_SEL 18 NDIS Descriptor */ 1459 { 0x0, /* segment base address */ 1460 0x0, /* length */ 1461 0, /* segment type */ 1462 0, /* segment descriptor priority level */ 1463 0, /* segment descriptor present */ 1464 0, 0, 1465 0, /* default 32 vs 16 bit size */ 1466 0 /* limit granularity (byte/page units)*/ }, 1467 }; 1468 1469 static struct soft_segment_descriptor ldt_segs[] = { 1470 /* Null Descriptor - overwritten by call gate */ 1471 { 0x0, /* segment base address */ 1472 0x0, /* length - all address space */ 1473 0, /* segment type */ 1474 0, /* segment descriptor priority level */ 1475 0, /* segment descriptor present */ 1476 0, 0, 1477 0, /* default 32 vs 16 bit size */ 1478 0 /* limit granularity (byte/page units)*/ }, 1479 /* Null Descriptor - overwritten by call gate */ 1480 { 0x0, /* segment base address */ 1481 0x0, /* length - all address space */ 1482 0, /* segment type */ 1483 0, /* segment descriptor priority level */ 1484 0, /* segment descriptor present */ 1485 0, 0, 1486 0, /* default 32 vs 16 bit size */ 1487 0 /* limit granularity (byte/page units)*/ }, 1488 /* Null Descriptor - overwritten by call gate */ 1489 { 0x0, /* segment base address */ 1490 0x0, /* length - all address space */ 1491 0, /* segment type */ 1492 0, /* segment descriptor priority level */ 1493 0, /* segment descriptor present */ 1494 0, 0, 1495 0, /* default 32 vs 16 bit size */ 1496 0 /* limit granularity (byte/page units)*/ }, 1497 /* Code Descriptor for user */ 1498 { 0x0, /* segment base address */ 1499 0xfffff, /* length - all address space */ 1500 SDT_MEMERA, /* segment type */ 1501 SEL_UPL, /* segment descriptor priority level */ 1502 1, /* segment descriptor present */ 1503 0, 0, 1504 1, /* default 32 vs 16 bit size */ 1505 1 /* limit granularity (byte/page units)*/ }, 1506 /* Null Descriptor - overwritten by call gate */ 1507 { 0x0, /* segment base address */ 1508 0x0, /* length - all address space */ 1509 0, /* segment type */ 1510 0, /* segment descriptor priority level */ 1511 0, /* segment descriptor present */ 1512 0, 0, 1513 0, /* default 32 vs 16 bit size */ 1514 0 /* limit granularity (byte/page units)*/ }, 1515 /* Data Descriptor for user */ 1516 { 0x0, /* segment base address */ 1517 0xfffff, /* length - all address space */ 1518 SDT_MEMRWA, /* segment type */ 1519 SEL_UPL, /* segment descriptor priority level */ 1520 1, /* segment descriptor present */ 1521 0, 0, 1522 1, /* default 32 vs 16 bit size */ 1523 1 /* limit granularity (byte/page units)*/ }, 1524 }; 1525 1526 void 1527 setidt(idx, func, typ, dpl, selec) 1528 int idx; 1529 inthand_t *func; 1530 int typ; 1531 int dpl; 1532 int selec; 1533 { 1534 struct gate_descriptor *ip; 1535 1536 ip = idt + idx; 1537 ip->gd_looffset = (int)func; 1538 ip->gd_selector = selec; 1539 ip->gd_stkcpy = 0; 1540 ip->gd_xx = 0; 1541 ip->gd_type = typ; 1542 ip->gd_dpl = dpl; 1543 ip->gd_p = 1; 1544 ip->gd_hioffset = ((int)func)>>16 ; 1545 } 1546 1547 #define IDTVEC(name) __CONCAT(X,name) 1548 1549 extern inthand_t 1550 IDTVEC(div), IDTVEC(dbg), IDTVEC(nmi), IDTVEC(bpt), IDTVEC(ofl), 1551 IDTVEC(bnd), IDTVEC(ill), IDTVEC(dna), IDTVEC(fpusegm), 1552 IDTVEC(tss), IDTVEC(missing), IDTVEC(stk), IDTVEC(prot), 1553 IDTVEC(page), IDTVEC(mchk), IDTVEC(rsvd), IDTVEC(fpu), IDTVEC(align), 1554 IDTVEC(xmm), IDTVEC(lcall_syscall), IDTVEC(int0x80_syscall); 1555 1556 #ifdef DDB 1557 /* 1558 * Display the index and function name of any IDT entries that don't use 1559 * the default 'rsvd' entry point. 1560 */ 1561 DB_SHOW_COMMAND(idt, db_show_idt) 1562 { 1563 struct gate_descriptor *ip; 1564 int idx, quit; 1565 uintptr_t func; 1566 1567 ip = idt; 1568 db_setup_paging(db_simple_pager, &quit, db_lines_per_page); 1569 for (idx = 0, quit = 0; idx < NIDT; idx++) { 1570 func = (ip->gd_hioffset << 16 | ip->gd_looffset); 1571 if (func != (uintptr_t)&IDTVEC(rsvd)) { 1572 db_printf("%3d\t", idx); 1573 db_printsym(func, DB_STGY_PROC); 1574 db_printf("\n"); 1575 } 1576 ip++; 1577 } 1578 } 1579 #endif 1580 1581 void 1582 sdtossd(sd, ssd) 1583 struct segment_descriptor *sd; 1584 struct soft_segment_descriptor *ssd; 1585 { 1586 ssd->ssd_base = (sd->sd_hibase << 24) | sd->sd_lobase; 1587 ssd->ssd_limit = (sd->sd_hilimit << 16) | sd->sd_lolimit; 1588 ssd->ssd_type = sd->sd_type; 1589 ssd->ssd_dpl = sd->sd_dpl; 1590 ssd->ssd_p = sd->sd_p; 1591 ssd->ssd_def32 = sd->sd_def32; 1592 ssd->ssd_gran = sd->sd_gran; 1593 } 1594 1595 #define PHYSMAP_SIZE (2 * 8) 1596 1597 /* 1598 * Populate the (physmap) array with base/bound pairs describing the 1599 * available physical memory in the system, then test this memory and 1600 * build the phys_avail array describing the actually-available memory. 1601 * 1602 * If we cannot accurately determine the physical memory map, then use 1603 * value from the 0xE801 call, and failing that, the RTC. 1604 * 1605 * Total memory size may be set by the kernel environment variable 1606 * hw.physmem or the compile-time define MAXMEM. 1607 * 1608 * XXX first should be vm_paddr_t. 1609 */ 1610 static void 1611 getmemsize(int first) 1612 { 1613 int i, physmap_idx, pa_indx, da_indx; 1614 int hasbrokenint12; 1615 u_long physmem_tunable; 1616 u_int extmem; 1617 struct vm86frame vmf; 1618 struct vm86context vmc; 1619 vm_paddr_t pa, physmap[PHYSMAP_SIZE]; 1620 pt_entry_t *pte; 1621 struct bios_smap *smap; 1622 quad_t dcons_addr, dcons_size; 1623 1624 hasbrokenint12 = 0; 1625 TUNABLE_INT_FETCH("hw.hasbrokenint12", &hasbrokenint12); 1626 bzero(&vmf, sizeof(vmf)); 1627 bzero(physmap, sizeof(physmap)); 1628 basemem = 0; 1629 1630 /* 1631 * Some newer BIOSes has broken INT 12H implementation which cause 1632 * kernel panic immediately. In this case, we need to scan SMAP 1633 * with INT 15:E820 first, then determine base memory size. 1634 */ 1635 if (hasbrokenint12) { 1636 goto int15e820; 1637 } 1638 1639 /* 1640 * Perform "base memory" related probes & setup 1641 */ 1642 vm86_intcall(0x12, &vmf); 1643 basemem = vmf.vmf_ax; 1644 if (basemem > 640) { 1645 printf("Preposterous BIOS basemem of %uK, truncating to 640K\n", 1646 basemem); 1647 basemem = 640; 1648 } 1649 1650 /* 1651 * XXX if biosbasemem is now < 640, there is a `hole' 1652 * between the end of base memory and the start of 1653 * ISA memory. The hole may be empty or it may 1654 * contain BIOS code or data. Map it read/write so 1655 * that the BIOS can write to it. (Memory from 0 to 1656 * the physical end of the kernel is mapped read-only 1657 * to begin with and then parts of it are remapped. 1658 * The parts that aren't remapped form holes that 1659 * remain read-only and are unused by the kernel. 1660 * The base memory area is below the physical end of 1661 * the kernel and right now forms a read-only hole. 1662 * The part of it from PAGE_SIZE to 1663 * (trunc_page(biosbasemem * 1024) - 1) will be 1664 * remapped and used by the kernel later.) 1665 * 1666 * This code is similar to the code used in 1667 * pmap_mapdev, but since no memory needs to be 1668 * allocated we simply change the mapping. 1669 */ 1670 for (pa = trunc_page(basemem * 1024); 1671 pa < ISA_HOLE_START; pa += PAGE_SIZE) 1672 pmap_kenter(KERNBASE + pa, pa); 1673 1674 /* 1675 * Map pages between basemem and ISA_HOLE_START, if any, r/w into 1676 * the vm86 page table so that vm86 can scribble on them using 1677 * the vm86 map too. XXX: why 2 ways for this and only 1 way for 1678 * page 0, at least as initialized here? 1679 */ 1680 pte = (pt_entry_t *)vm86paddr; 1681 for (i = basemem / 4; i < 160; i++) 1682 pte[i] = (i << PAGE_SHIFT) | PG_V | PG_RW | PG_U; 1683 1684 int15e820: 1685 /* 1686 * map page 1 R/W into the kernel page table so we can use it 1687 * as a buffer. The kernel will unmap this page later. 1688 */ 1689 pmap_kenter(KERNBASE + (1 << PAGE_SHIFT), 1 << PAGE_SHIFT); 1690 1691 /* 1692 * get memory map with INT 15:E820 1693 */ 1694 vmc.npages = 0; 1695 smap = (void *)vm86_addpage(&vmc, 1, KERNBASE + (1 << PAGE_SHIFT)); 1696 vm86_getptr(&vmc, (vm_offset_t)smap, &vmf.vmf_es, &vmf.vmf_di); 1697 1698 physmap_idx = 0; 1699 vmf.vmf_ebx = 0; 1700 do { 1701 vmf.vmf_eax = 0xE820; 1702 vmf.vmf_edx = SMAP_SIG; 1703 vmf.vmf_ecx = sizeof(struct bios_smap); 1704 i = vm86_datacall(0x15, &vmf, &vmc); 1705 if (i || vmf.vmf_eax != SMAP_SIG) 1706 break; 1707 if (boothowto & RB_VERBOSE) 1708 printf("SMAP type=%02x base=%016llx len=%016llx\n", 1709 smap->type, smap->base, smap->length); 1710 1711 if (smap->type != 0x01) 1712 continue; 1713 1714 if (smap->length == 0) 1715 continue; 1716 1717 #ifndef PAE 1718 if (smap->base >= 0xffffffff) { 1719 printf("%uK of memory above 4GB ignored\n", 1720 (u_int)(smap->length / 1024)); 1721 continue; 1722 } 1723 #endif 1724 1725 for (i = 0; i <= physmap_idx; i += 2) { 1726 if (smap->base < physmap[i + 1]) { 1727 if (boothowto & RB_VERBOSE) 1728 printf( 1729 "Overlapping or non-montonic memory region, ignoring second region\n"); 1730 continue; 1731 } 1732 } 1733 1734 if (smap->base == physmap[physmap_idx + 1]) { 1735 physmap[physmap_idx + 1] += smap->length; 1736 continue; 1737 } 1738 1739 physmap_idx += 2; 1740 if (physmap_idx == PHYSMAP_SIZE) { 1741 printf( 1742 "Too many segments in the physical address map, giving up\n"); 1743 break; 1744 } 1745 physmap[physmap_idx] = smap->base; 1746 physmap[physmap_idx + 1] = smap->base + smap->length; 1747 } while (vmf.vmf_ebx != 0); 1748 1749 /* 1750 * Perform "base memory" related probes & setup based on SMAP 1751 */ 1752 if (basemem == 0) { 1753 for (i = 0; i <= physmap_idx; i += 2) { 1754 if (physmap[i] == 0x00000000) { 1755 basemem = physmap[i + 1] / 1024; 1756 break; 1757 } 1758 } 1759 1760 /* 1761 * XXX this function is horribly organized and has to the same 1762 * things that it does above here. 1763 */ 1764 if (basemem == 0) 1765 basemem = 640; 1766 if (basemem > 640) { 1767 printf( 1768 "Preposterous BIOS basemem of %uK, truncating to 640K\n", 1769 basemem); 1770 basemem = 640; 1771 } 1772 1773 /* 1774 * Let vm86 scribble on pages between basemem and 1775 * ISA_HOLE_START, as above. 1776 */ 1777 for (pa = trunc_page(basemem * 1024); 1778 pa < ISA_HOLE_START; pa += PAGE_SIZE) 1779 pmap_kenter(KERNBASE + pa, pa); 1780 pte = (pt_entry_t *)vm86paddr; 1781 for (i = basemem / 4; i < 160; i++) 1782 pte[i] = (i << PAGE_SHIFT) | PG_V | PG_RW | PG_U; 1783 } 1784 1785 if (physmap[1] != 0) 1786 goto physmap_done; 1787 1788 /* 1789 * If we failed above, try memory map with INT 15:E801 1790 */ 1791 vmf.vmf_ax = 0xE801; 1792 if (vm86_intcall(0x15, &vmf) == 0) { 1793 extmem = vmf.vmf_cx + vmf.vmf_dx * 64; 1794 } else { 1795 #if 0 1796 vmf.vmf_ah = 0x88; 1797 vm86_intcall(0x15, &vmf); 1798 extmem = vmf.vmf_ax; 1799 #else 1800 /* 1801 * Prefer the RTC value for extended memory. 1802 */ 1803 extmem = rtcin(RTC_EXTLO) + (rtcin(RTC_EXTHI) << 8); 1804 #endif 1805 } 1806 1807 /* 1808 * Special hack for chipsets that still remap the 384k hole when 1809 * there's 16MB of memory - this really confuses people that 1810 * are trying to use bus mastering ISA controllers with the 1811 * "16MB limit"; they only have 16MB, but the remapping puts 1812 * them beyond the limit. 1813 * 1814 * If extended memory is between 15-16MB (16-17MB phys address range), 1815 * chop it to 15MB. 1816 */ 1817 if ((extmem > 15 * 1024) && (extmem < 16 * 1024)) 1818 extmem = 15 * 1024; 1819 1820 physmap[0] = 0; 1821 physmap[1] = basemem * 1024; 1822 physmap_idx = 2; 1823 physmap[physmap_idx] = 0x100000; 1824 physmap[physmap_idx + 1] = physmap[physmap_idx] + extmem * 1024; 1825 1826 physmap_done: 1827 /* 1828 * Now, physmap contains a map of physical memory. 1829 */ 1830 1831 #ifdef SMP 1832 /* make hole for AP bootstrap code */ 1833 physmap[1] = mp_bootaddress(physmap[1]); 1834 #endif 1835 1836 /* 1837 * Maxmem isn't the "maximum memory", it's one larger than the 1838 * highest page of the physical address space. It should be 1839 * called something like "Maxphyspage". We may adjust this 1840 * based on ``hw.physmem'' and the results of the memory test. 1841 */ 1842 Maxmem = atop(physmap[physmap_idx + 1]); 1843 1844 #ifdef MAXMEM 1845 Maxmem = MAXMEM / 4; 1846 #endif 1847 1848 if (TUNABLE_ULONG_FETCH("hw.physmem", &physmem_tunable)) 1849 Maxmem = atop(physmem_tunable); 1850 1851 if (atop(physmap[physmap_idx + 1]) != Maxmem && 1852 (boothowto & RB_VERBOSE)) 1853 printf("Physical memory use set to %ldK\n", Maxmem * 4); 1854 1855 /* 1856 * If Maxmem has been increased beyond what the system has detected, 1857 * extend the last memory segment to the new limit. 1858 */ 1859 if (atop(physmap[physmap_idx + 1]) < Maxmem) 1860 physmap[physmap_idx + 1] = ptoa((vm_paddr_t)Maxmem); 1861 1862 /* call pmap initialization to make new kernel address space */ 1863 pmap_bootstrap(first, 0); 1864 1865 /* 1866 * Size up each available chunk of physical memory. 1867 */ 1868 physmap[0] = PAGE_SIZE; /* mask off page 0 */ 1869 pa_indx = 0; 1870 da_indx = 1; 1871 phys_avail[pa_indx++] = physmap[0]; 1872 phys_avail[pa_indx] = physmap[0]; 1873 dump_avail[da_indx] = physmap[0]; 1874 pte = CMAP1; 1875 1876 /* 1877 * Get dcons buffer address 1878 */ 1879 if (getenv_quad("dcons.addr", &dcons_addr) == 0 || 1880 getenv_quad("dcons.size", &dcons_size) == 0) 1881 dcons_addr = 0; 1882 1883 /* 1884 * physmap is in bytes, so when converting to page boundaries, 1885 * round up the start address and round down the end address. 1886 */ 1887 for (i = 0; i <= physmap_idx; i += 2) { 1888 vm_paddr_t end; 1889 1890 end = ptoa((vm_paddr_t)Maxmem); 1891 if (physmap[i + 1] < end) 1892 end = trunc_page(physmap[i + 1]); 1893 for (pa = round_page(physmap[i]); pa < end; pa += PAGE_SIZE) { 1894 int tmp, page_bad, full; 1895 int *ptr = (int *)CADDR1; 1896 1897 full = FALSE; 1898 /* 1899 * block out kernel memory as not available. 1900 */ 1901 if (pa >= KERNLOAD && pa < first) 1902 goto do_dump_avail; 1903 1904 /* 1905 * block out dcons buffer 1906 */ 1907 if (dcons_addr > 0 1908 && pa >= trunc_page(dcons_addr) 1909 && pa < dcons_addr + dcons_size) 1910 goto do_dump_avail; 1911 1912 page_bad = FALSE; 1913 1914 /* 1915 * map page into kernel: valid, read/write,non-cacheable 1916 */ 1917 *pte = pa | PG_V | PG_RW | PG_N; 1918 invltlb(); 1919 1920 tmp = *(int *)ptr; 1921 /* 1922 * Test for alternating 1's and 0's 1923 */ 1924 *(volatile int *)ptr = 0xaaaaaaaa; 1925 if (*(volatile int *)ptr != 0xaaaaaaaa) 1926 page_bad = TRUE; 1927 /* 1928 * Test for alternating 0's and 1's 1929 */ 1930 *(volatile int *)ptr = 0x55555555; 1931 if (*(volatile int *)ptr != 0x55555555) 1932 page_bad = TRUE; 1933 /* 1934 * Test for all 1's 1935 */ 1936 *(volatile int *)ptr = 0xffffffff; 1937 if (*(volatile int *)ptr != 0xffffffff) 1938 page_bad = TRUE; 1939 /* 1940 * Test for all 0's 1941 */ 1942 *(volatile int *)ptr = 0x0; 1943 if (*(volatile int *)ptr != 0x0) 1944 page_bad = TRUE; 1945 /* 1946 * Restore original value. 1947 */ 1948 *(int *)ptr = tmp; 1949 1950 /* 1951 * Adjust array of valid/good pages. 1952 */ 1953 if (page_bad == TRUE) 1954 continue; 1955 /* 1956 * If this good page is a continuation of the 1957 * previous set of good pages, then just increase 1958 * the end pointer. Otherwise start a new chunk. 1959 * Note that "end" points one higher than end, 1960 * making the range >= start and < end. 1961 * If we're also doing a speculative memory 1962 * test and we at or past the end, bump up Maxmem 1963 * so that we keep going. The first bad page 1964 * will terminate the loop. 1965 */ 1966 if (phys_avail[pa_indx] == pa) { 1967 phys_avail[pa_indx] += PAGE_SIZE; 1968 } else { 1969 pa_indx++; 1970 if (pa_indx == PHYS_AVAIL_ARRAY_END) { 1971 printf( 1972 "Too many holes in the physical address space, giving up\n"); 1973 pa_indx--; 1974 full = TRUE; 1975 goto do_dump_avail; 1976 } 1977 phys_avail[pa_indx++] = pa; /* start */ 1978 phys_avail[pa_indx] = pa + PAGE_SIZE; /* end */ 1979 } 1980 physmem++; 1981 do_dump_avail: 1982 if (dump_avail[da_indx] == pa) { 1983 dump_avail[da_indx] += PAGE_SIZE; 1984 } else { 1985 da_indx++; 1986 if (da_indx == DUMP_AVAIL_ARRAY_END) { 1987 da_indx--; 1988 goto do_next; 1989 } 1990 dump_avail[da_indx++] = pa; /* start */ 1991 dump_avail[da_indx] = pa + PAGE_SIZE; /* end */ 1992 } 1993 do_next: 1994 if (full) 1995 break; 1996 } 1997 } 1998 *pte = 0; 1999 invltlb(); 2000 2001 /* 2002 * XXX 2003 * The last chunk must contain at least one page plus the message 2004 * buffer to avoid complicating other code (message buffer address 2005 * calculation, etc.). 2006 */ 2007 while (phys_avail[pa_indx - 1] + PAGE_SIZE + 2008 round_page(MSGBUF_SIZE) >= phys_avail[pa_indx]) { 2009 physmem -= atop(phys_avail[pa_indx] - phys_avail[pa_indx - 1]); 2010 phys_avail[pa_indx--] = 0; 2011 phys_avail[pa_indx--] = 0; 2012 } 2013 2014 Maxmem = atop(phys_avail[pa_indx]); 2015 2016 /* Trim off space for the message buffer. */ 2017 phys_avail[pa_indx] -= round_page(MSGBUF_SIZE); 2018 2019 avail_end = phys_avail[pa_indx]; 2020 } 2021 2022 void 2023 init386(first) 2024 int first; 2025 { 2026 struct gate_descriptor *gdp; 2027 int gsel_tss, metadata_missing, off, x; 2028 struct pcpu *pc; 2029 2030 thread0.td_kstack = proc0kstack; 2031 thread0.td_pcb = (struct pcb *) 2032 (thread0.td_kstack + KSTACK_PAGES * PAGE_SIZE) - 1; 2033 2034 /* 2035 * This may be done better later if it gets more high level 2036 * components in it. If so just link td->td_proc here. 2037 */ 2038 proc_linkup(&proc0, &ksegrp0, &thread0); 2039 2040 metadata_missing = 0; 2041 if (bootinfo.bi_modulep) { 2042 preload_metadata = (caddr_t)bootinfo.bi_modulep + KERNBASE; 2043 preload_bootstrap_relocate(KERNBASE); 2044 } else { 2045 metadata_missing = 1; 2046 } 2047 if (envmode == 1) 2048 kern_envp = static_env; 2049 else if (bootinfo.bi_envp) 2050 kern_envp = (caddr_t)bootinfo.bi_envp + KERNBASE; 2051 2052 /* Init basic tunables, hz etc */ 2053 init_param1(); 2054 2055 /* 2056 * Make gdt memory segments. All segments cover the full 4GB 2057 * of address space and permissions are enforced at page level. 2058 */ 2059 gdt_segs[GCODE_SEL].ssd_limit = atop(0 - 1); 2060 gdt_segs[GDATA_SEL].ssd_limit = atop(0 - 1); 2061 gdt_segs[GUCODE_SEL].ssd_limit = atop(0 - 1); 2062 gdt_segs[GUDATA_SEL].ssd_limit = atop(0 - 1); 2063 gdt_segs[GUFS_SEL].ssd_limit = atop(0 - 1); 2064 gdt_segs[GUGS_SEL].ssd_limit = atop(0 - 1); 2065 2066 #ifdef SMP 2067 pc = &SMP_prvspace[0].pcpu; 2068 #else 2069 pc = &__pcpu; 2070 #endif 2071 gdt_segs[GPRIV_SEL].ssd_limit = atop(0 - 1); 2072 gdt_segs[GPRIV_SEL].ssd_base = (int) pc; 2073 gdt_segs[GPROC0_SEL].ssd_base = (int) &pc->pc_common_tss; 2074 2075 for (x = 0; x < NGDT; x++) 2076 ssdtosd(&gdt_segs[x], &gdt[x].sd); 2077 2078 r_gdt.rd_limit = NGDT * sizeof(gdt[0]) - 1; 2079 r_gdt.rd_base = (int) gdt; 2080 lgdt(&r_gdt); 2081 2082 pcpu_init(pc, 0, sizeof(struct pcpu)); 2083 PCPU_SET(prvspace, pc); 2084 PCPU_SET(curthread, &thread0); 2085 PCPU_SET(curpcb, thread0.td_pcb); 2086 2087 /* 2088 * Initialize mutexes. 2089 * 2090 * icu_lock: in order to allow an interrupt to occur in a critical 2091 * section, to set pcpu->ipending (etc...) properly, we 2092 * must be able to get the icu lock, so it can't be 2093 * under witness. 2094 */ 2095 mutex_init(); 2096 mtx_init(&clock_lock, "clk", NULL, MTX_SPIN); 2097 mtx_init(&icu_lock, "icu", NULL, MTX_SPIN | MTX_NOWITNESS); 2098 2099 /* make ldt memory segments */ 2100 ldt_segs[LUCODE_SEL].ssd_limit = atop(0 - 1); 2101 ldt_segs[LUDATA_SEL].ssd_limit = atop(0 - 1); 2102 for (x = 0; x < sizeof ldt_segs / sizeof ldt_segs[0]; x++) 2103 ssdtosd(&ldt_segs[x], &ldt[x].sd); 2104 2105 _default_ldt = GSEL(GLDT_SEL, SEL_KPL); 2106 lldt(_default_ldt); 2107 PCPU_SET(currentldt, _default_ldt); 2108 2109 /* exceptions */ 2110 for (x = 0; x < NIDT; x++) 2111 setidt(x, &IDTVEC(rsvd), SDT_SYS386TGT, SEL_KPL, 2112 GSEL(GCODE_SEL, SEL_KPL)); 2113 setidt(IDT_DE, &IDTVEC(div), SDT_SYS386TGT, SEL_KPL, 2114 GSEL(GCODE_SEL, SEL_KPL)); 2115 setidt(IDT_DB, &IDTVEC(dbg), SDT_SYS386IGT, SEL_KPL, 2116 GSEL(GCODE_SEL, SEL_KPL)); 2117 setidt(IDT_NMI, &IDTVEC(nmi), SDT_SYS386IGT, SEL_KPL, 2118 GSEL(GCODE_SEL, SEL_KPL)); 2119 setidt(IDT_BP, &IDTVEC(bpt), SDT_SYS386IGT, SEL_UPL, 2120 GSEL(GCODE_SEL, SEL_KPL)); 2121 setidt(IDT_OF, &IDTVEC(ofl), SDT_SYS386TGT, SEL_UPL, 2122 GSEL(GCODE_SEL, SEL_KPL)); 2123 setidt(IDT_BR, &IDTVEC(bnd), SDT_SYS386TGT, SEL_KPL, 2124 GSEL(GCODE_SEL, SEL_KPL)); 2125 setidt(IDT_UD, &IDTVEC(ill), SDT_SYS386TGT, SEL_KPL, 2126 GSEL(GCODE_SEL, SEL_KPL)); 2127 setidt(IDT_NM, &IDTVEC(dna), SDT_SYS386TGT, SEL_KPL 2128 , GSEL(GCODE_SEL, SEL_KPL)); 2129 setidt(IDT_DF, 0, SDT_SYSTASKGT, SEL_KPL, GSEL(GPANIC_SEL, SEL_KPL)); 2130 setidt(IDT_FPUGP, &IDTVEC(fpusegm), SDT_SYS386TGT, SEL_KPL, 2131 GSEL(GCODE_SEL, SEL_KPL)); 2132 setidt(IDT_TS, &IDTVEC(tss), SDT_SYS386TGT, SEL_KPL, 2133 GSEL(GCODE_SEL, SEL_KPL)); 2134 setidt(IDT_NP, &IDTVEC(missing), SDT_SYS386TGT, SEL_KPL, 2135 GSEL(GCODE_SEL, SEL_KPL)); 2136 setidt(IDT_SS, &IDTVEC(stk), SDT_SYS386TGT, SEL_KPL, 2137 GSEL(GCODE_SEL, SEL_KPL)); 2138 setidt(IDT_GP, &IDTVEC(prot), SDT_SYS386TGT, SEL_KPL, 2139 GSEL(GCODE_SEL, SEL_KPL)); 2140 setidt(IDT_PF, &IDTVEC(page), SDT_SYS386IGT, SEL_KPL, 2141 GSEL(GCODE_SEL, SEL_KPL)); 2142 setidt(IDT_MF, &IDTVEC(fpu), SDT_SYS386TGT, SEL_KPL, 2143 GSEL(GCODE_SEL, SEL_KPL)); 2144 setidt(IDT_AC, &IDTVEC(align), SDT_SYS386TGT, SEL_KPL, 2145 GSEL(GCODE_SEL, SEL_KPL)); 2146 setidt(IDT_MC, &IDTVEC(mchk), SDT_SYS386TGT, SEL_KPL, 2147 GSEL(GCODE_SEL, SEL_KPL)); 2148 setidt(IDT_XF, &IDTVEC(xmm), SDT_SYS386TGT, SEL_KPL, 2149 GSEL(GCODE_SEL, SEL_KPL)); 2150 setidt(IDT_SYSCALL, &IDTVEC(int0x80_syscall), SDT_SYS386TGT, SEL_UPL, 2151 GSEL(GCODE_SEL, SEL_KPL)); 2152 2153 r_idt.rd_limit = sizeof(idt0) - 1; 2154 r_idt.rd_base = (int) idt; 2155 lidt(&r_idt); 2156 2157 /* 2158 * Initialize the console before we print anything out. 2159 */ 2160 cninit(); 2161 2162 if (metadata_missing) 2163 printf("WARNING: loader(8) metadata is missing!\n"); 2164 2165 #ifdef DEV_ISA 2166 elcr_probe(); 2167 atpic_startup(); 2168 #endif 2169 2170 #ifdef DDB 2171 ksym_start = bootinfo.bi_symtab; 2172 ksym_end = bootinfo.bi_esymtab; 2173 #endif 2174 2175 kdb_init(); 2176 2177 #ifdef KDB 2178 if (boothowto & RB_KDB) 2179 kdb_enter("Boot flags requested debugger"); 2180 #endif 2181 2182 finishidentcpu(); /* Final stage of CPU initialization */ 2183 setidt(IDT_UD, &IDTVEC(ill), SDT_SYS386TGT, SEL_KPL, 2184 GSEL(GCODE_SEL, SEL_KPL)); 2185 setidt(IDT_GP, &IDTVEC(prot), SDT_SYS386TGT, SEL_KPL, 2186 GSEL(GCODE_SEL, SEL_KPL)); 2187 initializecpu(); /* Initialize CPU registers */ 2188 2189 /* make an initial tss so cpu can get interrupt stack on syscall! */ 2190 /* Note: -16 is so we can grow the trapframe if we came from vm86 */ 2191 PCPU_SET(common_tss.tss_esp0, thread0.td_kstack + 2192 KSTACK_PAGES * PAGE_SIZE - sizeof(struct pcb) - 16); 2193 PCPU_SET(common_tss.tss_ss0, GSEL(GDATA_SEL, SEL_KPL)); 2194 gsel_tss = GSEL(GPROC0_SEL, SEL_KPL); 2195 private_tss = 0; 2196 PCPU_SET(tss_gdt, &gdt[GPROC0_SEL].sd); 2197 PCPU_SET(common_tssd, *PCPU_GET(tss_gdt)); 2198 PCPU_SET(common_tss.tss_ioopt, (sizeof (struct i386tss)) << 16); 2199 ltr(gsel_tss); 2200 2201 /* pointer to selector slot for %fs/%gs */ 2202 PCPU_SET(fsgs_gdt, &gdt[GUFS_SEL].sd); 2203 2204 dblfault_tss.tss_esp = dblfault_tss.tss_esp0 = dblfault_tss.tss_esp1 = 2205 dblfault_tss.tss_esp2 = (int)&dblfault_stack[sizeof(dblfault_stack)]; 2206 dblfault_tss.tss_ss = dblfault_tss.tss_ss0 = dblfault_tss.tss_ss1 = 2207 dblfault_tss.tss_ss2 = GSEL(GDATA_SEL, SEL_KPL); 2208 #ifdef PAE 2209 dblfault_tss.tss_cr3 = (int)IdlePDPT; 2210 #else 2211 dblfault_tss.tss_cr3 = (int)IdlePTD; 2212 #endif 2213 dblfault_tss.tss_eip = (int)dblfault_handler; 2214 dblfault_tss.tss_eflags = PSL_KERNEL; 2215 dblfault_tss.tss_ds = dblfault_tss.tss_es = 2216 dblfault_tss.tss_gs = GSEL(GDATA_SEL, SEL_KPL); 2217 dblfault_tss.tss_fs = GSEL(GPRIV_SEL, SEL_KPL); 2218 dblfault_tss.tss_cs = GSEL(GCODE_SEL, SEL_KPL); 2219 dblfault_tss.tss_ldt = GSEL(GLDT_SEL, SEL_KPL); 2220 2221 vm86_initialize(); 2222 getmemsize(first); 2223 init_param2(physmem); 2224 2225 /* now running on new page tables, configured,and u/iom is accessible */ 2226 2227 /* Map the message buffer. */ 2228 for (off = 0; off < round_page(MSGBUF_SIZE); off += PAGE_SIZE) 2229 pmap_kenter((vm_offset_t)msgbufp + off, avail_end + off); 2230 2231 msgbufinit(msgbufp, MSGBUF_SIZE); 2232 2233 /* make a call gate to reenter kernel with */ 2234 gdp = &ldt[LSYS5CALLS_SEL].gd; 2235 2236 x = (int) &IDTVEC(lcall_syscall); 2237 gdp->gd_looffset = x; 2238 gdp->gd_selector = GSEL(GCODE_SEL,SEL_KPL); 2239 gdp->gd_stkcpy = 1; 2240 gdp->gd_type = SDT_SYS386CGT; 2241 gdp->gd_dpl = SEL_UPL; 2242 gdp->gd_p = 1; 2243 gdp->gd_hioffset = x >> 16; 2244 2245 /* XXX does this work? */ 2246 /* XXX yes! */ 2247 ldt[LBSDICALLS_SEL] = ldt[LSYS5CALLS_SEL]; 2248 ldt[LSOL26CALLS_SEL] = ldt[LSYS5CALLS_SEL]; 2249 2250 /* transfer to user mode */ 2251 2252 _ucodesel = GSEL(GUCODE_SEL, SEL_UPL); 2253 _udatasel = GSEL(GUDATA_SEL, SEL_UPL); 2254 2255 /* setup proc 0's pcb */ 2256 thread0.td_pcb->pcb_flags = 0; /* XXXKSE */ 2257 #ifdef PAE 2258 thread0.td_pcb->pcb_cr3 = (int)IdlePDPT; 2259 #else 2260 thread0.td_pcb->pcb_cr3 = (int)IdlePTD; 2261 #endif 2262 thread0.td_pcb->pcb_ext = 0; 2263 thread0.td_frame = &proc0_tf; 2264 } 2265 2266 void 2267 cpu_pcpu_init(struct pcpu *pcpu, int cpuid, size_t size) 2268 { 2269 2270 pcpu->pc_acpi_id = 0xffffffff; 2271 } 2272 2273 void 2274 spinlock_enter(void) 2275 { 2276 struct thread *td; 2277 2278 td = curthread; 2279 if (td->td_md.md_spinlock_count == 0) 2280 td->td_md.md_saved_flags = intr_disable(); 2281 td->td_md.md_spinlock_count++; 2282 critical_enter(); 2283 } 2284 2285 void 2286 spinlock_exit(void) 2287 { 2288 struct thread *td; 2289 2290 td = curthread; 2291 critical_exit(); 2292 td->td_md.md_spinlock_count--; 2293 if (td->td_md.md_spinlock_count == 0) 2294 intr_restore(td->td_md.md_saved_flags); 2295 } 2296 2297 #if defined(I586_CPU) && !defined(NO_F00F_HACK) 2298 static void f00f_hack(void *unused); 2299 SYSINIT(f00f_hack, SI_SUB_INTRINSIC, SI_ORDER_FIRST, f00f_hack, NULL) 2300 2301 static void 2302 f00f_hack(void *unused) 2303 { 2304 struct gate_descriptor *new_idt; 2305 vm_offset_t tmp; 2306 2307 if (!has_f00f_bug) 2308 return; 2309 2310 GIANT_REQUIRED; 2311 2312 printf("Intel Pentium detected, installing workaround for F00F bug\n"); 2313 2314 tmp = kmem_alloc(kernel_map, PAGE_SIZE * 2); 2315 if (tmp == 0) 2316 panic("kmem_alloc returned 0"); 2317 2318 /* Put the problematic entry (#6) at the end of the lower page. */ 2319 new_idt = (struct gate_descriptor*) 2320 (tmp + PAGE_SIZE - 7 * sizeof(struct gate_descriptor)); 2321 bcopy(idt, new_idt, sizeof(idt0)); 2322 r_idt.rd_base = (u_int)new_idt; 2323 lidt(&r_idt); 2324 idt = new_idt; 2325 if (vm_map_protect(kernel_map, tmp, tmp + PAGE_SIZE, 2326 VM_PROT_READ, FALSE) != KERN_SUCCESS) 2327 panic("vm_map_protect failed"); 2328 } 2329 #endif /* defined(I586_CPU) && !NO_F00F_HACK */ 2330 2331 /* 2332 * Construct a PCB from a trapframe. This is called from kdb_trap() where 2333 * we want to start a backtrace from the function that caused us to enter 2334 * the debugger. We have the context in the trapframe, but base the trace 2335 * on the PCB. The PCB doesn't have to be perfect, as long as it contains 2336 * enough for a backtrace. 2337 */ 2338 void 2339 makectx(struct trapframe *tf, struct pcb *pcb) 2340 { 2341 2342 pcb->pcb_edi = tf->tf_edi; 2343 pcb->pcb_esi = tf->tf_esi; 2344 pcb->pcb_ebp = tf->tf_ebp; 2345 pcb->pcb_ebx = tf->tf_ebx; 2346 pcb->pcb_eip = tf->tf_eip; 2347 pcb->pcb_esp = (ISPL(tf->tf_cs)) ? tf->tf_esp : (int)(tf + 1) - 8; 2348 } 2349 2350 int 2351 ptrace_set_pc(struct thread *td, u_long addr) 2352 { 2353 2354 td->td_frame->tf_eip = addr; 2355 return (0); 2356 } 2357 2358 int 2359 ptrace_single_step(struct thread *td) 2360 { 2361 td->td_frame->tf_eflags |= PSL_T; 2362 return (0); 2363 } 2364 2365 int 2366 ptrace_clear_single_step(struct thread *td) 2367 { 2368 td->td_frame->tf_eflags &= ~PSL_T; 2369 return (0); 2370 } 2371 2372 int 2373 fill_regs(struct thread *td, struct reg *regs) 2374 { 2375 struct pcb *pcb; 2376 struct trapframe *tp; 2377 2378 tp = td->td_frame; 2379 pcb = td->td_pcb; 2380 regs->r_fs = tp->tf_fs; 2381 regs->r_es = tp->tf_es; 2382 regs->r_ds = tp->tf_ds; 2383 regs->r_edi = tp->tf_edi; 2384 regs->r_esi = tp->tf_esi; 2385 regs->r_ebp = tp->tf_ebp; 2386 regs->r_ebx = tp->tf_ebx; 2387 regs->r_edx = tp->tf_edx; 2388 regs->r_ecx = tp->tf_ecx; 2389 regs->r_eax = tp->tf_eax; 2390 regs->r_eip = tp->tf_eip; 2391 regs->r_cs = tp->tf_cs; 2392 regs->r_eflags = tp->tf_eflags; 2393 regs->r_esp = tp->tf_esp; 2394 regs->r_ss = tp->tf_ss; 2395 regs->r_gs = pcb->pcb_gs; 2396 return (0); 2397 } 2398 2399 int 2400 set_regs(struct thread *td, struct reg *regs) 2401 { 2402 struct pcb *pcb; 2403 struct trapframe *tp; 2404 2405 tp = td->td_frame; 2406 if (!EFL_SECURE(regs->r_eflags, tp->tf_eflags) || 2407 !CS_SECURE(regs->r_cs)) 2408 return (EINVAL); 2409 pcb = td->td_pcb; 2410 tp->tf_fs = regs->r_fs; 2411 tp->tf_es = regs->r_es; 2412 tp->tf_ds = regs->r_ds; 2413 tp->tf_edi = regs->r_edi; 2414 tp->tf_esi = regs->r_esi; 2415 tp->tf_ebp = regs->r_ebp; 2416 tp->tf_ebx = regs->r_ebx; 2417 tp->tf_edx = regs->r_edx; 2418 tp->tf_ecx = regs->r_ecx; 2419 tp->tf_eax = regs->r_eax; 2420 tp->tf_eip = regs->r_eip; 2421 tp->tf_cs = regs->r_cs; 2422 tp->tf_eflags = regs->r_eflags; 2423 tp->tf_esp = regs->r_esp; 2424 tp->tf_ss = regs->r_ss; 2425 pcb->pcb_gs = regs->r_gs; 2426 return (0); 2427 } 2428 2429 #ifdef CPU_ENABLE_SSE 2430 static void 2431 fill_fpregs_xmm(sv_xmm, sv_87) 2432 struct savexmm *sv_xmm; 2433 struct save87 *sv_87; 2434 { 2435 register struct env87 *penv_87 = &sv_87->sv_env; 2436 register struct envxmm *penv_xmm = &sv_xmm->sv_env; 2437 int i; 2438 2439 bzero(sv_87, sizeof(*sv_87)); 2440 2441 /* FPU control/status */ 2442 penv_87->en_cw = penv_xmm->en_cw; 2443 penv_87->en_sw = penv_xmm->en_sw; 2444 penv_87->en_tw = penv_xmm->en_tw; 2445 penv_87->en_fip = penv_xmm->en_fip; 2446 penv_87->en_fcs = penv_xmm->en_fcs; 2447 penv_87->en_opcode = penv_xmm->en_opcode; 2448 penv_87->en_foo = penv_xmm->en_foo; 2449 penv_87->en_fos = penv_xmm->en_fos; 2450 2451 /* FPU registers */ 2452 for (i = 0; i < 8; ++i) 2453 sv_87->sv_ac[i] = sv_xmm->sv_fp[i].fp_acc; 2454 } 2455 2456 static void 2457 set_fpregs_xmm(sv_87, sv_xmm) 2458 struct save87 *sv_87; 2459 struct savexmm *sv_xmm; 2460 { 2461 register struct env87 *penv_87 = &sv_87->sv_env; 2462 register struct envxmm *penv_xmm = &sv_xmm->sv_env; 2463 int i; 2464 2465 /* FPU control/status */ 2466 penv_xmm->en_cw = penv_87->en_cw; 2467 penv_xmm->en_sw = penv_87->en_sw; 2468 penv_xmm->en_tw = penv_87->en_tw; 2469 penv_xmm->en_fip = penv_87->en_fip; 2470 penv_xmm->en_fcs = penv_87->en_fcs; 2471 penv_xmm->en_opcode = penv_87->en_opcode; 2472 penv_xmm->en_foo = penv_87->en_foo; 2473 penv_xmm->en_fos = penv_87->en_fos; 2474 2475 /* FPU registers */ 2476 for (i = 0; i < 8; ++i) 2477 sv_xmm->sv_fp[i].fp_acc = sv_87->sv_ac[i]; 2478 } 2479 #endif /* CPU_ENABLE_SSE */ 2480 2481 int 2482 fill_fpregs(struct thread *td, struct fpreg *fpregs) 2483 { 2484 #ifdef CPU_ENABLE_SSE 2485 if (cpu_fxsr) { 2486 fill_fpregs_xmm(&td->td_pcb->pcb_save.sv_xmm, 2487 (struct save87 *)fpregs); 2488 return (0); 2489 } 2490 #endif /* CPU_ENABLE_SSE */ 2491 bcopy(&td->td_pcb->pcb_save.sv_87, fpregs, sizeof *fpregs); 2492 return (0); 2493 } 2494 2495 int 2496 set_fpregs(struct thread *td, struct fpreg *fpregs) 2497 { 2498 #ifdef CPU_ENABLE_SSE 2499 if (cpu_fxsr) { 2500 set_fpregs_xmm((struct save87 *)fpregs, 2501 &td->td_pcb->pcb_save.sv_xmm); 2502 return (0); 2503 } 2504 #endif /* CPU_ENABLE_SSE */ 2505 bcopy(fpregs, &td->td_pcb->pcb_save.sv_87, sizeof *fpregs); 2506 return (0); 2507 } 2508 2509 /* 2510 * Get machine context. 2511 */ 2512 int 2513 get_mcontext(struct thread *td, mcontext_t *mcp, int flags) 2514 { 2515 struct trapframe *tp; 2516 2517 tp = td->td_frame; 2518 2519 PROC_LOCK(curthread->td_proc); 2520 mcp->mc_onstack = sigonstack(tp->tf_esp); 2521 PROC_UNLOCK(curthread->td_proc); 2522 mcp->mc_gs = td->td_pcb->pcb_gs; 2523 mcp->mc_fs = tp->tf_fs; 2524 mcp->mc_es = tp->tf_es; 2525 mcp->mc_ds = tp->tf_ds; 2526 mcp->mc_edi = tp->tf_edi; 2527 mcp->mc_esi = tp->tf_esi; 2528 mcp->mc_ebp = tp->tf_ebp; 2529 mcp->mc_isp = tp->tf_isp; 2530 if (flags & GET_MC_CLEAR_RET) { 2531 mcp->mc_eax = 0; 2532 mcp->mc_edx = 0; 2533 } else { 2534 mcp->mc_eax = tp->tf_eax; 2535 mcp->mc_edx = tp->tf_edx; 2536 } 2537 mcp->mc_ebx = tp->tf_ebx; 2538 mcp->mc_ecx = tp->tf_ecx; 2539 mcp->mc_eip = tp->tf_eip; 2540 mcp->mc_cs = tp->tf_cs; 2541 mcp->mc_eflags = tp->tf_eflags; 2542 mcp->mc_esp = tp->tf_esp; 2543 mcp->mc_ss = tp->tf_ss; 2544 mcp->mc_len = sizeof(*mcp); 2545 get_fpcontext(td, mcp); 2546 return (0); 2547 } 2548 2549 /* 2550 * Set machine context. 2551 * 2552 * However, we don't set any but the user modifiable flags, and we won't 2553 * touch the cs selector. 2554 */ 2555 int 2556 set_mcontext(struct thread *td, const mcontext_t *mcp) 2557 { 2558 struct trapframe *tp; 2559 int eflags, ret; 2560 2561 tp = td->td_frame; 2562 if (mcp->mc_len != sizeof(*mcp)) 2563 return (EINVAL); 2564 eflags = (mcp->mc_eflags & PSL_USERCHANGE) | 2565 (tp->tf_eflags & ~PSL_USERCHANGE); 2566 if ((ret = set_fpcontext(td, mcp)) == 0) { 2567 tp->tf_fs = mcp->mc_fs; 2568 tp->tf_es = mcp->mc_es; 2569 tp->tf_ds = mcp->mc_ds; 2570 tp->tf_edi = mcp->mc_edi; 2571 tp->tf_esi = mcp->mc_esi; 2572 tp->tf_ebp = mcp->mc_ebp; 2573 tp->tf_ebx = mcp->mc_ebx; 2574 tp->tf_edx = mcp->mc_edx; 2575 tp->tf_ecx = mcp->mc_ecx; 2576 tp->tf_eax = mcp->mc_eax; 2577 tp->tf_eip = mcp->mc_eip; 2578 tp->tf_eflags = eflags; 2579 tp->tf_esp = mcp->mc_esp; 2580 tp->tf_ss = mcp->mc_ss; 2581 td->td_pcb->pcb_gs = mcp->mc_gs; 2582 ret = 0; 2583 } 2584 return (ret); 2585 } 2586 2587 static void 2588 get_fpcontext(struct thread *td, mcontext_t *mcp) 2589 { 2590 #ifndef DEV_NPX 2591 mcp->mc_fpformat = _MC_FPFMT_NODEV; 2592 mcp->mc_ownedfp = _MC_FPOWNED_NONE; 2593 #else 2594 union savefpu *addr; 2595 2596 /* 2597 * XXX mc_fpstate might be misaligned, since its declaration is not 2598 * unportabilized using __attribute__((aligned(16))) like the 2599 * declaration of struct savemm, and anyway, alignment doesn't work 2600 * for auto variables since we don't use gcc's pessimal stack 2601 * alignment. Work around this by abusing the spare fields after 2602 * mcp->mc_fpstate. 2603 * 2604 * XXX unpessimize most cases by only aligning when fxsave might be 2605 * called, although this requires knowing too much about 2606 * npxgetregs()'s internals. 2607 */ 2608 addr = (union savefpu *)&mcp->mc_fpstate; 2609 if (td == PCPU_GET(fpcurthread) && 2610 #ifdef CPU_ENABLE_SSE 2611 cpu_fxsr && 2612 #endif 2613 ((uintptr_t)(void *)addr & 0xF)) { 2614 do 2615 addr = (void *)((char *)addr + 4); 2616 while ((uintptr_t)(void *)addr & 0xF); 2617 } 2618 mcp->mc_ownedfp = npxgetregs(td, addr); 2619 if (addr != (union savefpu *)&mcp->mc_fpstate) { 2620 bcopy(addr, &mcp->mc_fpstate, sizeof(mcp->mc_fpstate)); 2621 bzero(&mcp->mc_spare2, sizeof(mcp->mc_spare2)); 2622 } 2623 mcp->mc_fpformat = npxformat(); 2624 #endif 2625 } 2626 2627 static int 2628 set_fpcontext(struct thread *td, const mcontext_t *mcp) 2629 { 2630 union savefpu *addr; 2631 2632 if (mcp->mc_fpformat == _MC_FPFMT_NODEV) 2633 return (0); 2634 else if (mcp->mc_fpformat != _MC_FPFMT_387 && 2635 mcp->mc_fpformat != _MC_FPFMT_XMM) 2636 return (EINVAL); 2637 else if (mcp->mc_ownedfp == _MC_FPOWNED_NONE) 2638 /* We don't care what state is left in the FPU or PCB. */ 2639 fpstate_drop(td); 2640 else if (mcp->mc_ownedfp == _MC_FPOWNED_FPU || 2641 mcp->mc_ownedfp == _MC_FPOWNED_PCB) { 2642 /* XXX align as above. */ 2643 addr = (union savefpu *)&mcp->mc_fpstate; 2644 if (td == PCPU_GET(fpcurthread) && 2645 #ifdef CPU_ENABLE_SSE 2646 cpu_fxsr && 2647 #endif 2648 ((uintptr_t)(void *)addr & 0xF)) { 2649 do 2650 addr = (void *)((char *)addr + 4); 2651 while ((uintptr_t)(void *)addr & 0xF); 2652 bcopy(&mcp->mc_fpstate, addr, sizeof(mcp->mc_fpstate)); 2653 } 2654 #ifdef DEV_NPX 2655 /* 2656 * XXX we violate the dubious requirement that npxsetregs() 2657 * be called with interrupts disabled. 2658 */ 2659 npxsetregs(td, addr); 2660 #endif 2661 /* 2662 * Don't bother putting things back where they were in the 2663 * misaligned case, since we know that the caller won't use 2664 * them again. 2665 */ 2666 } else 2667 return (EINVAL); 2668 return (0); 2669 } 2670 2671 static void 2672 fpstate_drop(struct thread *td) 2673 { 2674 register_t s; 2675 2676 s = intr_disable(); 2677 #ifdef DEV_NPX 2678 if (PCPU_GET(fpcurthread) == td) 2679 npxdrop(); 2680 #endif 2681 /* 2682 * XXX force a full drop of the npx. The above only drops it if we 2683 * owned it. npxgetregs() has the same bug in the !cpu_fxsr case. 2684 * 2685 * XXX I don't much like npxgetregs()'s semantics of doing a full 2686 * drop. Dropping only to the pcb matches fnsave's behaviour. 2687 * We only need to drop to !PCB_INITDONE in sendsig(). But 2688 * sendsig() is the only caller of npxgetregs()... perhaps we just 2689 * have too many layers. 2690 */ 2691 curthread->td_pcb->pcb_flags &= ~PCB_NPXINITDONE; 2692 intr_restore(s); 2693 } 2694 2695 int 2696 fill_dbregs(struct thread *td, struct dbreg *dbregs) 2697 { 2698 struct pcb *pcb; 2699 2700 if (td == NULL) { 2701 dbregs->dr[0] = rdr0(); 2702 dbregs->dr[1] = rdr1(); 2703 dbregs->dr[2] = rdr2(); 2704 dbregs->dr[3] = rdr3(); 2705 dbregs->dr[4] = rdr4(); 2706 dbregs->dr[5] = rdr5(); 2707 dbregs->dr[6] = rdr6(); 2708 dbregs->dr[7] = rdr7(); 2709 } else { 2710 pcb = td->td_pcb; 2711 dbregs->dr[0] = pcb->pcb_dr0; 2712 dbregs->dr[1] = pcb->pcb_dr1; 2713 dbregs->dr[2] = pcb->pcb_dr2; 2714 dbregs->dr[3] = pcb->pcb_dr3; 2715 dbregs->dr[4] = 0; 2716 dbregs->dr[5] = 0; 2717 dbregs->dr[6] = pcb->pcb_dr6; 2718 dbregs->dr[7] = pcb->pcb_dr7; 2719 } 2720 return (0); 2721 } 2722 2723 int 2724 set_dbregs(struct thread *td, struct dbreg *dbregs) 2725 { 2726 struct pcb *pcb; 2727 int i; 2728 u_int32_t mask1, mask2; 2729 2730 if (td == NULL) { 2731 load_dr0(dbregs->dr[0]); 2732 load_dr1(dbregs->dr[1]); 2733 load_dr2(dbregs->dr[2]); 2734 load_dr3(dbregs->dr[3]); 2735 load_dr4(dbregs->dr[4]); 2736 load_dr5(dbregs->dr[5]); 2737 load_dr6(dbregs->dr[6]); 2738 load_dr7(dbregs->dr[7]); 2739 } else { 2740 /* 2741 * Don't let an illegal value for dr7 get set. Specifically, 2742 * check for undefined settings. Setting these bit patterns 2743 * result in undefined behaviour and can lead to an unexpected 2744 * TRCTRAP. 2745 */ 2746 for (i = 0, mask1 = 0x3<<16, mask2 = 0x2<<16; i < 8; 2747 i++, mask1 <<= 2, mask2 <<= 2) 2748 if ((dbregs->dr[7] & mask1) == mask2) 2749 return (EINVAL); 2750 2751 pcb = td->td_pcb; 2752 2753 /* 2754 * Don't let a process set a breakpoint that is not within the 2755 * process's address space. If a process could do this, it 2756 * could halt the system by setting a breakpoint in the kernel 2757 * (if ddb was enabled). Thus, we need to check to make sure 2758 * that no breakpoints are being enabled for addresses outside 2759 * process's address space, unless, perhaps, we were called by 2760 * uid 0. 2761 * 2762 * XXX - what about when the watched area of the user's 2763 * address space is written into from within the kernel 2764 * ... wouldn't that still cause a breakpoint to be generated 2765 * from within kernel mode? 2766 */ 2767 2768 if (suser(td) != 0) { 2769 if (dbregs->dr[7] & 0x3) { 2770 /* dr0 is enabled */ 2771 if (dbregs->dr[0] >= VM_MAXUSER_ADDRESS) 2772 return (EINVAL); 2773 } 2774 2775 if (dbregs->dr[7] & (0x3<<2)) { 2776 /* dr1 is enabled */ 2777 if (dbregs->dr[1] >= VM_MAXUSER_ADDRESS) 2778 return (EINVAL); 2779 } 2780 2781 if (dbregs->dr[7] & (0x3<<4)) { 2782 /* dr2 is enabled */ 2783 if (dbregs->dr[2] >= VM_MAXUSER_ADDRESS) 2784 return (EINVAL); 2785 } 2786 2787 if (dbregs->dr[7] & (0x3<<6)) { 2788 /* dr3 is enabled */ 2789 if (dbregs->dr[3] >= VM_MAXUSER_ADDRESS) 2790 return (EINVAL); 2791 } 2792 } 2793 2794 pcb->pcb_dr0 = dbregs->dr[0]; 2795 pcb->pcb_dr1 = dbregs->dr[1]; 2796 pcb->pcb_dr2 = dbregs->dr[2]; 2797 pcb->pcb_dr3 = dbregs->dr[3]; 2798 pcb->pcb_dr6 = dbregs->dr[6]; 2799 pcb->pcb_dr7 = dbregs->dr[7]; 2800 2801 pcb->pcb_flags |= PCB_DBREGS; 2802 } 2803 2804 return (0); 2805 } 2806 2807 /* 2808 * Return > 0 if a hardware breakpoint has been hit, and the 2809 * breakpoint was in user space. Return 0, otherwise. 2810 */ 2811 int 2812 user_dbreg_trap(void) 2813 { 2814 u_int32_t dr7, dr6; /* debug registers dr6 and dr7 */ 2815 u_int32_t bp; /* breakpoint bits extracted from dr6 */ 2816 int nbp; /* number of breakpoints that triggered */ 2817 caddr_t addr[4]; /* breakpoint addresses */ 2818 int i; 2819 2820 dr7 = rdr7(); 2821 if ((dr7 & 0x000000ff) == 0) { 2822 /* 2823 * all GE and LE bits in the dr7 register are zero, 2824 * thus the trap couldn't have been caused by the 2825 * hardware debug registers 2826 */ 2827 return 0; 2828 } 2829 2830 nbp = 0; 2831 dr6 = rdr6(); 2832 bp = dr6 & 0x0000000f; 2833 2834 if (!bp) { 2835 /* 2836 * None of the breakpoint bits are set meaning this 2837 * trap was not caused by any of the debug registers 2838 */ 2839 return 0; 2840 } 2841 2842 /* 2843 * at least one of the breakpoints were hit, check to see 2844 * which ones and if any of them are user space addresses 2845 */ 2846 2847 if (bp & 0x01) { 2848 addr[nbp++] = (caddr_t)rdr0(); 2849 } 2850 if (bp & 0x02) { 2851 addr[nbp++] = (caddr_t)rdr1(); 2852 } 2853 if (bp & 0x04) { 2854 addr[nbp++] = (caddr_t)rdr2(); 2855 } 2856 if (bp & 0x08) { 2857 addr[nbp++] = (caddr_t)rdr3(); 2858 } 2859 2860 for (i=0; i<nbp; i++) { 2861 if (addr[i] < 2862 (caddr_t)VM_MAXUSER_ADDRESS) { 2863 /* 2864 * addr[i] is in user space 2865 */ 2866 return nbp; 2867 } 2868 } 2869 2870 /* 2871 * None of the breakpoints are in user space. 2872 */ 2873 return 0; 2874 } 2875 2876 #ifndef DEV_APIC 2877 #include <machine/apicvar.h> 2878 2879 /* 2880 * Provide stub functions so that the MADT APIC enumerator in the acpi 2881 * kernel module will link against a kernel without 'device apic'. 2882 * 2883 * XXX - This is a gross hack. 2884 */ 2885 void 2886 apic_register_enumerator(struct apic_enumerator *enumerator) 2887 { 2888 } 2889 2890 void * 2891 ioapic_create(uintptr_t addr, int32_t id, int intbase) 2892 { 2893 return (NULL); 2894 } 2895 2896 int 2897 ioapic_disable_pin(void *cookie, u_int pin) 2898 { 2899 return (ENXIO); 2900 } 2901 2902 int 2903 ioapic_get_vector(void *cookie, u_int pin) 2904 { 2905 return (-1); 2906 } 2907 2908 void 2909 ioapic_register(void *cookie) 2910 { 2911 } 2912 2913 int 2914 ioapic_remap_vector(void *cookie, u_int pin, int vector) 2915 { 2916 return (ENXIO); 2917 } 2918 2919 int 2920 ioapic_set_extint(void *cookie, u_int pin) 2921 { 2922 return (ENXIO); 2923 } 2924 2925 int 2926 ioapic_set_nmi(void *cookie, u_int pin) 2927 { 2928 return (ENXIO); 2929 } 2930 2931 int 2932 ioapic_set_polarity(void *cookie, u_int pin, enum intr_polarity pol) 2933 { 2934 return (ENXIO); 2935 } 2936 2937 int 2938 ioapic_set_triggermode(void *cookie, u_int pin, enum intr_trigger trigger) 2939 { 2940 return (ENXIO); 2941 } 2942 2943 void 2944 lapic_create(u_int apic_id, int boot_cpu) 2945 { 2946 } 2947 2948 void 2949 lapic_init(uintptr_t addr) 2950 { 2951 } 2952 2953 int 2954 lapic_set_lvt_mode(u_int apic_id, u_int lvt, u_int32_t mode) 2955 { 2956 return (ENXIO); 2957 } 2958 2959 int 2960 lapic_set_lvt_polarity(u_int apic_id, u_int lvt, enum intr_polarity pol) 2961 { 2962 return (ENXIO); 2963 } 2964 2965 int 2966 lapic_set_lvt_triggermode(u_int apic_id, u_int lvt, enum intr_trigger trigger) 2967 { 2968 return (ENXIO); 2969 } 2970 #endif 2971 2972 #ifdef KDB 2973 2974 /* 2975 * Provide inb() and outb() as functions. They are normally only 2976 * available as macros calling inlined functions, thus cannot be 2977 * called from the debugger. 2978 * 2979 * The actual code is stolen from <machine/cpufunc.h>, and de-inlined. 2980 */ 2981 2982 #undef inb 2983 #undef outb 2984 2985 /* silence compiler warnings */ 2986 u_char inb(u_int); 2987 void outb(u_int, u_char); 2988 2989 u_char 2990 inb(u_int port) 2991 { 2992 u_char data; 2993 /* 2994 * We use %%dx and not %1 here because i/o is done at %dx and not at 2995 * %edx, while gcc generates inferior code (movw instead of movl) 2996 * if we tell it to load (u_short) port. 2997 */ 2998 __asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port)); 2999 return (data); 3000 } 3001 3002 void 3003 outb(u_int port, u_char data) 3004 { 3005 u_char al; 3006 /* 3007 * Use an unnecessary assignment to help gcc's register allocator. 3008 * This make a large difference for gcc-1.40 and a tiny difference 3009 * for gcc-2.6.0. For gcc-1.40, al had to be ``asm("ax")'' for 3010 * best results. gcc-2.6.0 can't handle this. 3011 */ 3012 al = data; 3013 __asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port)); 3014 } 3015 3016 #endif /* KDB */
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