Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]
FreeBSD/Linux Kernel Cross Reference
sys/amd64/amd64/machdep.c
Version:
- FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10
SearchContext: - none - 3 - 10
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 * $FreeBSD: releng/5.1/sys/amd64/amd64/machdep.c 115432 2003-05-31 07:00:08Z peter $ 39 */ 40 41 #include "opt_atalk.h" 42 #include "opt_compat.h" 43 #include "opt_cpu.h" 44 #include "opt_ddb.h" 45 #include "opt_inet.h" 46 #include "opt_ipx.h" 47 #include "opt_isa.h" 48 #include "opt_maxmem.h" 49 #include "opt_msgbuf.h" 50 #include "opt_perfmon.h" 51 #include "opt_kstack_pages.h" 52 53 #include <sys/param.h> 54 #include <sys/systm.h> 55 #include <sys/sysproto.h> 56 #include <sys/signalvar.h> 57 #include <sys/imgact.h> 58 #include <sys/kernel.h> 59 #include <sys/ktr.h> 60 #include <sys/linker.h> 61 #include <sys/lock.h> 62 #include <sys/malloc.h> 63 #include <sys/mutex.h> 64 #include <sys/pcpu.h> 65 #include <sys/proc.h> 66 #include <sys/bio.h> 67 #include <sys/buf.h> 68 #include <sys/reboot.h> 69 #include <sys/callout.h> 70 #include <sys/msgbuf.h> 71 #include <sys/sched.h> 72 #include <sys/sysent.h> 73 #include <sys/sysctl.h> 74 #include <sys/ucontext.h> 75 #include <sys/vmmeter.h> 76 #include <sys/bus.h> 77 #include <sys/eventhandler.h> 78 79 #include <vm/vm.h> 80 #include <vm/vm_param.h> 81 #include <vm/vm_kern.h> 82 #include <vm/vm_object.h> 83 #include <vm/vm_page.h> 84 #include <vm/vm_map.h> 85 #include <vm/vm_pager.h> 86 #include <vm/vm_extern.h> 87 88 #include <sys/user.h> 89 #include <sys/exec.h> 90 #include <sys/cons.h> 91 92 #include <ddb/ddb.h> 93 94 #include <net/netisr.h> 95 96 #include <machine/cpu.h> 97 #include <machine/cputypes.h> 98 #include <machine/reg.h> 99 #include <machine/clock.h> 100 #include <machine/specialreg.h> 101 #include <machine/md_var.h> 102 #include <machine/metadata.h> 103 #include <machine/proc.h> 104 #ifdef PERFMON 105 #include <machine/perfmon.h> 106 #endif 107 #include <machine/tss.h> 108 109 #include <amd64/isa/icu.h> 110 #include <amd64/isa/intr_machdep.h> 111 #include <isa/rtc.h> 112 #include <sys/ptrace.h> 113 #include <machine/sigframe.h> 114 115 extern u_int64_t hammer_time(u_int64_t, u_int64_t); 116 extern void dblfault_handler(void); 117 118 extern void printcpuinfo(void); /* XXX header file */ 119 extern void identify_cpu(void); 120 extern void panicifcpuunsupported(void); 121 extern void initializecpu(void); 122 123 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL) 124 #define EFL_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) 125 126 static void cpu_startup(void *); 127 static void get_fpcontext(struct thread *td, mcontext_t *mcp); 128 static int set_fpcontext(struct thread *td, const mcontext_t *mcp); 129 SYSINIT(cpu, SI_SUB_CPU, SI_ORDER_FIRST, cpu_startup, NULL) 130 131 int _udatasel, _ucodesel, _ucode32sel; 132 u_long atdevbase; 133 134 int cold = 1; 135 136 long Maxmem = 0; 137 138 vm_paddr_t phys_avail[10]; 139 140 /* must be 2 less so 0 0 can signal end of chunks */ 141 #define PHYS_AVAIL_ARRAY_END ((sizeof(phys_avail) / sizeof(vm_offset_t)) - 2) 142 143 struct kva_md_info kmi; 144 145 static struct trapframe proc0_tf; 146 static struct pcpu __pcpu; 147 148 struct mtx icu_lock; 149 150 static void 151 cpu_startup(dummy) 152 void *dummy; 153 { 154 /* 155 * Good {morning,afternoon,evening,night}. 156 */ 157 startrtclock(); 158 printcpuinfo(); 159 panicifcpuunsupported(); 160 #ifdef PERFMON 161 perfmon_init(); 162 #endif 163 printf("real memory = %ju (%ju MB)\n", ptoa((uintmax_t)Maxmem), 164 ptoa((uintmax_t)Maxmem) / 1048576); 165 /* 166 * Display any holes after the first chunk of extended memory. 167 */ 168 if (bootverbose) { 169 int indx; 170 171 printf("Physical memory chunk(s):\n"); 172 for (indx = 0; phys_avail[indx + 1] != 0; indx += 2) { 173 vm_paddr_t size; 174 175 size = phys_avail[indx + 1] - phys_avail[indx]; 176 printf( 177 "0x%016jx - 0x%016jx, %ju bytes (%ju pages)\n", 178 (uintmax_t)phys_avail[indx], 179 (uintmax_t)phys_avail[indx + 1] - 1, 180 (uintmax_t)size, (uintmax_t)size / PAGE_SIZE); 181 } 182 } 183 184 vm_ksubmap_init(&kmi); 185 186 printf("avail memory = %ju (%ju MB)\n", 187 ptoa((uintmax_t)cnt.v_free_count), 188 ptoa((uintmax_t)cnt.v_free_count) / 1048576); 189 190 /* 191 * Set up buffers, so they can be used to read disk labels. 192 */ 193 bufinit(); 194 vm_pager_bufferinit(); 195 196 /* For SMP, we delay the cpu_setregs() until after SMP startup. */ 197 cpu_setregs(); 198 } 199 200 /* 201 * Send an interrupt to process. 202 * 203 * Stack is set up to allow sigcode stored 204 * at top to call routine, followed by kcall 205 * to sigreturn routine below. After sigreturn 206 * resets the signal mask, the stack, and the 207 * frame pointer, it returns to the user 208 * specified pc, psl. 209 */ 210 void 211 sendsig(catcher, sig, mask, code) 212 sig_t catcher; 213 int sig; 214 sigset_t *mask; 215 u_long code; 216 { 217 struct sigframe sf, *sfp; 218 struct proc *p; 219 struct thread *td; 220 struct sigacts *psp; 221 char *sp; 222 struct trapframe *regs; 223 int oonstack; 224 225 td = curthread; 226 p = td->td_proc; 227 PROC_LOCK_ASSERT(p, MA_OWNED); 228 psp = p->p_sigacts; 229 mtx_assert(&psp->ps_mtx, MA_OWNED); 230 regs = td->td_frame; 231 oonstack = sigonstack(regs->tf_rsp); 232 233 /* Save user context. */ 234 bzero(&sf, sizeof(sf)); 235 sf.sf_uc.uc_sigmask = *mask; 236 sf.sf_uc.uc_stack = p->p_sigstk; 237 sf.sf_uc.uc_stack.ss_flags = (p->p_flag & P_ALTSTACK) 238 ? ((oonstack) ? SS_ONSTACK : 0) : SS_DISABLE; 239 sf.sf_uc.uc_mcontext.mc_onstack = (oonstack) ? 1 : 0; 240 bcopy(regs, &sf.sf_uc.uc_mcontext.mc_rdi, sizeof(*regs)); 241 sf.sf_uc.uc_mcontext.mc_len = sizeof(sf.sf_uc.uc_mcontext); /* magic */ 242 get_fpcontext(td, &sf.sf_uc.uc_mcontext); 243 fpstate_drop(td); 244 245 /* Allocate space for the signal handler context. */ 246 if ((p->p_flag & P_ALTSTACK) != 0 && !oonstack && 247 SIGISMEMBER(psp->ps_sigonstack, sig)) { 248 sp = p->p_sigstk.ss_sp + 249 p->p_sigstk.ss_size - sizeof(struct sigframe); 250 #if defined(COMPAT_43) || defined(COMPAT_SUNOS) 251 p->p_sigstk.ss_flags |= SS_ONSTACK; 252 #endif 253 } else 254 sp = (char *)regs->tf_rsp - sizeof(struct sigframe) - 128; 255 /* Align to 16 bytes. */ 256 sfp = (struct sigframe *)((unsigned long)sp & ~0xF); 257 258 /* Translate the signal if appropriate. */ 259 if (p->p_sysent->sv_sigtbl && sig <= p->p_sysent->sv_sigsize) 260 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)]; 261 262 /* Build the argument list for the signal handler. */ 263 regs->tf_rdi = sig; /* arg 1 in %rdi */ 264 regs->tf_rdx = (register_t)&sfp->sf_uc; /* arg 3 in %rdx */ 265 if (SIGISMEMBER(psp->ps_siginfo, sig)) { 266 /* Signal handler installed with SA_SIGINFO. */ 267 regs->tf_rsi = (register_t)&sfp->sf_si; /* arg 2 in %rsi */ 268 sf.sf_ahu.sf_action = (__siginfohandler_t *)catcher; 269 270 /* Fill in POSIX parts */ 271 sf.sf_si.si_signo = sig; 272 sf.sf_si.si_code = code; 273 regs->tf_rcx = regs->tf_addr; /* arg 4 in %rcx */ 274 } else { 275 /* Old FreeBSD-style arguments. */ 276 regs->tf_rsi = code; /* arg 2 in %rsi */ 277 regs->tf_rcx = regs->tf_addr; /* arg 4 in %rcx */ 278 sf.sf_ahu.sf_handler = catcher; 279 } 280 mtx_unlock(&psp->ps_mtx); 281 PROC_UNLOCK(p); 282 283 /* 284 * Copy the sigframe out to the user's stack. 285 */ 286 if (copyout(&sf, sfp, sizeof(*sfp)) != 0) { 287 #ifdef DEBUG 288 printf("process %ld has trashed its stack\n", (long)p->p_pid); 289 #endif 290 PROC_LOCK(p); 291 sigexit(td, SIGILL); 292 } 293 294 regs->tf_rsp = (long)sfp; 295 regs->tf_rip = PS_STRINGS - *(p->p_sysent->sv_szsigcode); 296 regs->tf_rflags &= ~PSL_T; 297 regs->tf_cs = _ucodesel; 298 PROC_LOCK(p); 299 mtx_lock(&psp->ps_mtx); 300 } 301 302 /* 303 * System call to cleanup state after a signal 304 * has been taken. Reset signal mask and 305 * stack state from context left by sendsig (above). 306 * Return to previous pc and psl as specified by 307 * context left by sendsig. Check carefully to 308 * make sure that the user has not modified the 309 * state to gain improper privileges. 310 * 311 * MPSAFE 312 */ 313 int 314 sigreturn(td, uap) 315 struct thread *td; 316 struct sigreturn_args /* { 317 const __ucontext *sigcntxp; 318 } */ *uap; 319 { 320 ucontext_t uc; 321 struct proc *p = td->td_proc; 322 struct trapframe *regs; 323 const ucontext_t *ucp; 324 long rflags; 325 int cs, error, ret; 326 327 error = copyin(uap->sigcntxp, &uc, sizeof(uc)); 328 if (error != 0) 329 return (error); 330 ucp = &uc; 331 regs = td->td_frame; 332 rflags = ucp->uc_mcontext.mc_rflags; 333 /* 334 * Don't allow users to change privileged or reserved flags. 335 */ 336 /* 337 * XXX do allow users to change the privileged flag PSL_RF. 338 * The cpu sets PSL_RF in tf_rflags for faults. Debuggers 339 * should sometimes set it there too. tf_rflags is kept in 340 * the signal context during signal handling and there is no 341 * other place to remember it, so the PSL_RF bit may be 342 * corrupted by the signal handler without us knowing. 343 * Corruption of the PSL_RF bit at worst causes one more or 344 * one less debugger trap, so allowing it is fairly harmless. 345 */ 346 if (!EFL_SECURE(rflags & ~PSL_RF, regs->tf_rflags & ~PSL_RF)) { 347 printf("sigreturn: rflags = 0x%lx\n", rflags); 348 return (EINVAL); 349 } 350 351 /* 352 * Don't allow users to load a valid privileged %cs. Let the 353 * hardware check for invalid selectors, excess privilege in 354 * other selectors, invalid %eip's and invalid %esp's. 355 */ 356 cs = ucp->uc_mcontext.mc_cs; 357 if (!CS_SECURE(cs)) { 358 printf("sigreturn: cs = 0x%x\n", cs); 359 trapsignal(td, SIGBUS, T_PROTFLT); 360 return (EINVAL); 361 } 362 363 ret = set_fpcontext(td, &ucp->uc_mcontext); 364 if (ret != 0) 365 return (ret); 366 bcopy(&ucp->uc_mcontext.mc_rdi, regs, sizeof(*regs)); 367 368 PROC_LOCK(p); 369 #if defined(COMPAT_43) || defined(COMPAT_SUNOS) 370 if (ucp->uc_mcontext.mc_onstack & 1) 371 p->p_sigstk.ss_flags |= SS_ONSTACK; 372 else 373 p->p_sigstk.ss_flags &= ~SS_ONSTACK; 374 #endif 375 376 td->td_sigmask = ucp->uc_sigmask; 377 SIG_CANTMASK(td->td_sigmask); 378 signotify(td); 379 PROC_UNLOCK(p); 380 td->td_pcb->pcb_flags |= PCB_FULLCTX; 381 return (EJUSTRETURN); 382 } 383 384 #ifdef COMPAT_FREEBSD4 385 int 386 freebsd4_sigreturn(struct thread *td, struct freebsd4_sigreturn_args *uap) 387 { 388 389 return sigreturn(td, (struct sigreturn_args *)uap); 390 } 391 #endif 392 393 394 /* 395 * Machine dependent boot() routine 396 * 397 * I haven't seen anything to put here yet 398 * Possibly some stuff might be grafted back here from boot() 399 */ 400 void 401 cpu_boot(int howto) 402 { 403 } 404 405 /* 406 * Shutdown the CPU as much as possible 407 */ 408 void 409 cpu_halt(void) 410 { 411 for (;;) 412 __asm__ ("hlt"); 413 } 414 415 /* 416 * Hook to idle the CPU when possible. In the SMP case we default to 417 * off because a halted cpu will not currently pick up a new thread in the 418 * run queue until the next timer tick. If turned on this will result in 419 * approximately a 4.2% loss in real time performance in buildworld tests 420 * (but improves user and sys times oddly enough), and saves approximately 421 * 5% in power consumption on an idle machine (tests w/2xCPU 1.1GHz P3). 422 * 423 * XXX we need to have a cpu mask of idle cpus and generate an IPI or 424 * otherwise generate some sort of interrupt to wake up cpus sitting in HLT. 425 * Then we can have our cake and eat it too. 426 * 427 * XXX I'm turning it on for SMP as well by default for now. It seems to 428 * help lock contention somewhat, and this is critical for HTT. -Peter 429 */ 430 static int cpu_idle_hlt = 1; 431 SYSCTL_INT(_machdep, OID_AUTO, cpu_idle_hlt, CTLFLAG_RW, 432 &cpu_idle_hlt, 0, "Idle loop HLT enable"); 433 434 /* 435 * Note that we have to be careful here to avoid a race between checking 436 * sched_runnable() and actually halting. If we don't do this, we may waste 437 * the time between calling hlt and the next interrupt even though there 438 * is a runnable process. 439 */ 440 void 441 cpu_idle(void) 442 { 443 444 if (cpu_idle_hlt) { 445 disable_intr(); 446 if (sched_runnable()) { 447 enable_intr(); 448 } else { 449 /* 450 * we must absolutely guarentee that hlt is the 451 * absolute next instruction after sti or we 452 * introduce a timing window. 453 */ 454 __asm __volatile("sti; hlt"); 455 } 456 } 457 } 458 459 /* 460 * Clear registers on exec 461 */ 462 void 463 exec_setregs(td, entry, stack, ps_strings) 464 struct thread *td; 465 u_long entry; 466 u_long stack; 467 u_long ps_strings; 468 { 469 struct trapframe *regs = td->td_frame; 470 struct pcb *pcb = td->td_pcb; 471 472 wrmsr(MSR_FSBASE, 0); 473 wrmsr(MSR_KGSBASE, 0); /* User value while we're in the kernel */ 474 pcb->pcb_fsbase = 0; 475 pcb->pcb_gsbase = 0; 476 load_ds(_udatasel); 477 load_es(_udatasel); 478 load_fs(_udatasel); 479 load_gs(_udatasel); 480 pcb->pcb_ds = _udatasel; 481 pcb->pcb_es = _udatasel; 482 pcb->pcb_fs = _udatasel; 483 pcb->pcb_gs = _udatasel; 484 485 bzero((char *)regs, sizeof(struct trapframe)); 486 regs->tf_rip = entry; 487 /* This strangeness is to ensure alignment after the implied return address */ 488 regs->tf_rsp = ((stack - 8) & ~0xF) + 8; 489 regs->tf_rdi = stack; /* argv */ 490 regs->tf_rflags = PSL_USER | (regs->tf_rflags & PSL_T); 491 regs->tf_ss = _udatasel; 492 regs->tf_cs = _ucodesel; 493 494 /* 495 * Arrange to trap the next npx or `fwait' instruction (see npx.c 496 * for why fwait must be trapped at least if there is an npx or an 497 * emulator). This is mainly to handle the case where npx0 is not 498 * configured, since the npx routines normally set up the trap 499 * otherwise. It should be done only at boot time, but doing it 500 * here allows modifying `npx_exists' for testing the emulator on 501 * systems with an npx. 502 */ 503 load_cr0(rcr0() | CR0_MP | CR0_TS); 504 505 /* Initialize the npx (if any) for the current process. */ 506 /* 507 * XXX the above load_cr0() also initializes it and is a layering 508 * violation if NPX is configured. It drops the npx partially 509 * and this would be fatal if we were interrupted now, and decided 510 * to force the state to the pcb, and checked the invariant 511 * (CR0_TS clear) if and only if PCPU_GET(fpcurthread) != NULL). 512 * ALL of this can happen except the check. The check used to 513 * happen and be fatal later when we didn't complete the drop 514 * before returning to user mode. This should be fixed properly 515 * soon. 516 */ 517 fpstate_drop(td); 518 } 519 520 void 521 cpu_setregs(void) 522 { 523 register_t cr0; 524 525 cr0 = rcr0(); 526 cr0 |= CR0_NE; /* Done by npxinit() */ 527 cr0 |= CR0_MP | CR0_TS; /* Done at every execve() too. */ 528 cr0 |= CR0_WP | CR0_AM; 529 load_cr0(cr0); 530 } 531 532 static int 533 sysctl_machdep_adjkerntz(SYSCTL_HANDLER_ARGS) 534 { 535 int error; 536 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, 537 req); 538 if (!error && req->newptr) 539 resettodr(); 540 return (error); 541 } 542 543 SYSCTL_PROC(_machdep, CPU_ADJKERNTZ, adjkerntz, CTLTYPE_INT|CTLFLAG_RW, 544 &adjkerntz, 0, sysctl_machdep_adjkerntz, "I", ""); 545 546 SYSCTL_INT(_machdep, CPU_DISRTCSET, disable_rtc_set, 547 CTLFLAG_RW, &disable_rtc_set, 0, ""); 548 549 SYSCTL_INT(_machdep, CPU_WALLCLOCK, wall_cmos_clock, 550 CTLFLAG_RW, &wall_cmos_clock, 0, ""); 551 552 /* 553 * Initialize 386 and configure to run kernel 554 */ 555 556 /* 557 * Initialize segments & interrupt table 558 */ 559 560 struct user_segment_descriptor gdt[NGDT];/* global descriptor table */ 561 static struct gate_descriptor idt0[NIDT]; 562 struct gate_descriptor *idt = &idt0[0]; /* interrupt descriptor table */ 563 564 static char dblfault_stack[PAGE_SIZE] __aligned(16); 565 566 struct amd64tss common_tss; 567 568 /* software prototypes -- in more palatable form */ 569 struct soft_segment_descriptor gdt_segs[] = { 570 /* GNULL_SEL 0 Null Descriptor */ 571 { 0x0, /* segment base address */ 572 0x0, /* length */ 573 0, /* segment type */ 574 0, /* segment descriptor priority level */ 575 0, /* segment descriptor present */ 576 0, /* long */ 577 0, /* default 32 vs 16 bit size */ 578 0 /* limit granularity (byte/page units)*/ }, 579 /* GCODE_SEL 1 Code Descriptor for kernel */ 580 { 0x0, /* segment base address */ 581 0xfffff, /* length - all address space */ 582 SDT_MEMERA, /* segment type */ 583 SEL_KPL, /* segment descriptor priority level */ 584 1, /* segment descriptor present */ 585 1, /* long */ 586 0, /* default 32 vs 16 bit size */ 587 1 /* limit granularity (byte/page units)*/ }, 588 /* GDATA_SEL 2 Data Descriptor for kernel */ 589 { 0x0, /* segment base address */ 590 0xfffff, /* length - all address space */ 591 SDT_MEMRWA, /* segment type */ 592 SEL_KPL, /* segment descriptor priority level */ 593 1, /* segment descriptor present */ 594 1, /* long */ 595 0, /* default 32 vs 16 bit size */ 596 1 /* limit granularity (byte/page units)*/ }, 597 /* GUCODE32_SEL 3 32 bit Code Descriptor for user */ 598 { 0x0, /* segment base address */ 599 0xfffff, /* length - all address space */ 600 SDT_MEMERA, /* segment type */ 601 SEL_UPL, /* segment descriptor priority level */ 602 1, /* segment descriptor present */ 603 0, /* long */ 604 1, /* default 32 vs 16 bit size */ 605 1 /* limit granularity (byte/page units)*/ }, 606 /* GUDATA_SEL 4 32/64 bit Data Descriptor for user */ 607 { 0x0, /* segment base address */ 608 0xfffff, /* length - all address space */ 609 SDT_MEMRWA, /* segment type */ 610 SEL_UPL, /* segment descriptor priority level */ 611 1, /* segment descriptor present */ 612 0, /* long */ 613 1, /* default 32 vs 16 bit size */ 614 1 /* limit granularity (byte/page units)*/ }, 615 /* GUCODE_SEL 5 64 bit Code Descriptor for user */ 616 { 0x0, /* segment base address */ 617 0xfffff, /* length - all address space */ 618 SDT_MEMERA, /* segment type */ 619 SEL_UPL, /* segment descriptor priority level */ 620 1, /* segment descriptor present */ 621 1, /* long */ 622 0, /* default 32 vs 16 bit size */ 623 1 /* limit granularity (byte/page units)*/ }, 624 /* GPROC0_SEL 6 Proc 0 Tss Descriptor */ 625 { 626 0x0, /* segment base address */ 627 sizeof(struct amd64tss)-1,/* length - all address space */ 628 SDT_SYSTSS, /* segment type */ 629 SEL_KPL, /* segment descriptor priority level */ 630 1, /* segment descriptor present */ 631 0, /* long */ 632 0, /* unused - default 32 vs 16 bit size */ 633 0 /* limit granularity (byte/page units)*/ }, 634 /* Actually, the TSS is a system descriptor which is double size */ 635 { 0x0, /* segment base address */ 636 0x0, /* length */ 637 0, /* segment type */ 638 0, /* segment descriptor priority level */ 639 0, /* segment descriptor present */ 640 0, /* long */ 641 0, /* default 32 vs 16 bit size */ 642 0 /* limit granularity (byte/page units)*/ }, 643 }; 644 645 void 646 setidt(idx, func, typ, dpl, ist) 647 int idx; 648 inthand_t *func; 649 int typ; 650 int dpl; 651 int ist; 652 { 653 struct gate_descriptor *ip; 654 655 ip = idt + idx; 656 ip->gd_looffset = (uintptr_t)func; 657 ip->gd_selector = GSEL(GCODE_SEL, SEL_KPL); 658 ip->gd_ist = ist; 659 ip->gd_xx = 0; 660 ip->gd_type = typ; 661 ip->gd_dpl = dpl; 662 ip->gd_p = 1; 663 ip->gd_hioffset = ((uintptr_t)func)>>16 ; 664 } 665 666 #define IDTVEC(name) __CONCAT(X,name) 667 668 extern inthand_t 669 IDTVEC(div), IDTVEC(dbg), IDTVEC(nmi), IDTVEC(bpt), IDTVEC(ofl), 670 IDTVEC(bnd), IDTVEC(ill), IDTVEC(dna), IDTVEC(fpusegm), 671 IDTVEC(tss), IDTVEC(missing), IDTVEC(stk), IDTVEC(prot), 672 IDTVEC(page), IDTVEC(mchk), IDTVEC(rsvd), IDTVEC(fpu), IDTVEC(align), 673 IDTVEC(xmm), IDTVEC(dblfault), 674 IDTVEC(fast_syscall), IDTVEC(fast_syscall32); 675 676 void 677 sdtossd(sd, ssd) 678 struct user_segment_descriptor *sd; 679 struct soft_segment_descriptor *ssd; 680 { 681 682 ssd->ssd_base = (sd->sd_hibase << 24) | sd->sd_lobase; 683 ssd->ssd_limit = (sd->sd_hilimit << 16) | sd->sd_lolimit; 684 ssd->ssd_type = sd->sd_type; 685 ssd->ssd_dpl = sd->sd_dpl; 686 ssd->ssd_p = sd->sd_p; 687 ssd->ssd_long = sd->sd_long; 688 ssd->ssd_def32 = sd->sd_def32; 689 ssd->ssd_gran = sd->sd_gran; 690 } 691 692 void 693 ssdtosd(ssd, sd) 694 struct soft_segment_descriptor *ssd; 695 struct user_segment_descriptor *sd; 696 { 697 698 sd->sd_lobase = (ssd->ssd_base) & 0xffffff; 699 sd->sd_hibase = (ssd->ssd_base >> 24) & 0xff; 700 sd->sd_lolimit = (ssd->ssd_limit) & 0xffff; 701 sd->sd_hilimit = (ssd->ssd_limit >> 16) & 0xf; 702 sd->sd_type = ssd->ssd_type; 703 sd->sd_dpl = ssd->ssd_dpl; 704 sd->sd_p = ssd->ssd_p; 705 sd->sd_long = ssd->ssd_long; 706 sd->sd_def32 = ssd->ssd_def32; 707 sd->sd_gran = ssd->ssd_gran; 708 } 709 710 void 711 ssdtosyssd(ssd, sd) 712 struct soft_segment_descriptor *ssd; 713 struct system_segment_descriptor *sd; 714 { 715 716 sd->sd_lobase = (ssd->ssd_base) & 0xffffff; 717 sd->sd_hibase = (ssd->ssd_base >> 24) & 0xfffffffffful; 718 sd->sd_lolimit = (ssd->ssd_limit) & 0xffff; 719 sd->sd_hilimit = (ssd->ssd_limit >> 16) & 0xf; 720 sd->sd_type = ssd->ssd_type; 721 sd->sd_dpl = ssd->ssd_dpl; 722 sd->sd_p = ssd->ssd_p; 723 sd->sd_gran = ssd->ssd_gran; 724 } 725 726 727 #define PHYSMAP_SIZE (2 * 8) 728 729 struct bios_smap { 730 u_int64_t base; 731 u_int64_t length; 732 u_int32_t type; 733 } __packed; 734 735 /* 736 * Populate the (physmap) array with base/bound pairs describing the 737 * available physical memory in the system, then test this memory and 738 * build the phys_avail array describing the actually-available memory. 739 * 740 * If we cannot accurately determine the physical memory map, then use 741 * value from the 0xE801 call, and failing that, the RTC. 742 * 743 * Total memory size may be set by the kernel environment variable 744 * hw.physmem or the compile-time define MAXMEM. 745 * 746 * XXX first should be vm_paddr_t. 747 */ 748 static void 749 getmemsize(caddr_t kmdp, u_int64_t first) 750 { 751 int i, physmap_idx, pa_indx; 752 u_int basemem, extmem; 753 vm_paddr_t pa, physmap[PHYSMAP_SIZE]; 754 pt_entry_t *pte; 755 char *cp; 756 struct bios_smap *smapbase, *smap, *smapend; 757 u_int32_t smapsize; 758 759 bzero(physmap, sizeof(physmap)); 760 basemem = 0; 761 physmap_idx = 0; 762 763 /* 764 * get memory map from INT 15:E820, kindly supplied by the loader. 765 * 766 * subr_module.c says: 767 * "Consumer may safely assume that size value precedes data." 768 * ie: an int32_t immediately precedes smap. 769 */ 770 smapbase = (struct bios_smap *)preload_search_info(kmdp, MODINFO_METADATA | MODINFOMD_SMAP); 771 if (smapbase == 0) 772 smapbase = (struct bios_smap *)preload_search_info(kmdp, MODINFO_METADATA | 0x0009); /* Old value for MODINFOMD_SMAP */ 773 if (smapbase == 0) { 774 panic("No BIOS smap info from loader!"); 775 goto deep_shit; 776 } 777 smapsize = *((u_int32_t *)smapbase - 1); 778 smapend = (struct bios_smap *)((uintptr_t)smapbase + smapsize); 779 780 for (smap = smapbase; smap < smapend; smap++) { 781 if (boothowto & RB_VERBOSE) 782 printf("SMAP type=%02x base=%016lx len=%016lx\n", 783 smap->type, smap->base, smap->length); 784 785 if (smap->type != 0x01) { 786 continue; 787 } 788 789 if (smap->length == 0) { 790 next_run: 791 continue; 792 } 793 794 for (i = 0; i <= physmap_idx; i += 2) { 795 if (smap->base < physmap[i + 1]) { 796 if (boothowto & RB_VERBOSE) 797 printf( 798 "Overlapping or non-montonic memory region, ignoring second region\n"); 799 goto next_run; 800 } 801 } 802 803 if (smap->base == physmap[physmap_idx + 1]) { 804 physmap[physmap_idx + 1] += smap->length; 805 continue; 806 } 807 808 physmap_idx += 2; 809 if (physmap_idx == PHYSMAP_SIZE) { 810 printf( 811 "Too many segments in the physical address map, giving up\n"); 812 break; 813 } 814 physmap[physmap_idx] = smap->base; 815 physmap[physmap_idx + 1] = smap->base + smap->length; 816 } 817 818 /* 819 * Perform "base memory" related probes & setup based on SMAP 820 */ 821 deep_shit: 822 if (basemem == 0) { 823 for (i = 0; i <= physmap_idx; i += 2) { 824 if (physmap[i] == 0x00000000) { 825 basemem = physmap[i + 1] / 1024; 826 break; 827 } 828 } 829 830 if (basemem == 0) { 831 basemem = rtcin(RTC_BASELO) + (rtcin(RTC_BASEHI) << 8); 832 } 833 834 if (basemem == 0) { 835 basemem = 640; 836 } 837 838 if (basemem > 640) { 839 printf("Preposterous BIOS basemem of %uK, truncating to 640K\n", 840 basemem); 841 basemem = 640; 842 } 843 844 #if 0 845 for (pa = trunc_page(basemem * 1024); 846 pa < ISA_HOLE_START; pa += PAGE_SIZE) 847 pmap_kenter(KERNBASE + pa, pa); 848 #endif 849 } 850 851 if (physmap[1] != 0) 852 goto physmap_done; 853 854 /* 855 * Prefer the RTC value for extended memory. 856 */ 857 extmem = rtcin(RTC_EXTLO) + (rtcin(RTC_EXTHI) << 8); 858 859 /* 860 * Special hack for chipsets that still remap the 384k hole when 861 * there's 16MB of memory - this really confuses people that 862 * are trying to use bus mastering ISA controllers with the 863 * "16MB limit"; they only have 16MB, but the remapping puts 864 * them beyond the limit. 865 * 866 * If extended memory is between 15-16MB (16-17MB phys address range), 867 * chop it to 15MB. 868 */ 869 if ((extmem > 15 * 1024) && (extmem < 16 * 1024)) 870 extmem = 15 * 1024; 871 872 physmap[0] = 0; 873 physmap[1] = basemem * 1024; 874 physmap_idx = 2; 875 physmap[physmap_idx] = 0x100000; 876 physmap[physmap_idx + 1] = physmap[physmap_idx] + extmem * 1024; 877 878 physmap_done: 879 /* 880 * Now, physmap contains a map of physical memory. 881 */ 882 /* 883 * Maxmem isn't the "maximum memory", it's one larger than the 884 * highest page of the physical address space. It should be 885 * called something like "Maxphyspage". We may adjust this 886 * based on ``hw.physmem'' and the results of the memory test. 887 */ 888 Maxmem = atop(physmap[physmap_idx + 1]); 889 890 #ifdef MAXMEM 891 Maxmem = MAXMEM / 4; 892 #endif 893 894 /* 895 * hw.physmem is a size in bytes; we also allow k, m, and g suffixes 896 * for the appropriate modifiers. This overrides MAXMEM. 897 */ 898 if ((cp = getenv("hw.physmem")) != NULL) { 899 u_int64_t AllowMem, sanity; 900 char *ep; 901 902 sanity = AllowMem = strtouq(cp, &ep, 0); 903 if ((ep != cp) && (*ep != 0)) { 904 switch(*ep) { 905 case 'g': 906 case 'G': 907 AllowMem <<= 10; 908 case 'm': 909 case 'M': 910 AllowMem <<= 10; 911 case 'k': 912 case 'K': 913 AllowMem <<= 10; 914 break; 915 default: 916 AllowMem = sanity = 0; 917 } 918 if (AllowMem < sanity) 919 AllowMem = 0; 920 } 921 if (AllowMem == 0) 922 printf("Ignoring invalid memory size of '%s'\n", cp); 923 else 924 Maxmem = atop(AllowMem); 925 freeenv(cp); 926 } 927 928 if (atop(physmap[physmap_idx + 1]) != Maxmem && 929 (boothowto & RB_VERBOSE)) 930 printf("Physical memory use set to %ldK\n", Maxmem * 4); 931 932 /* 933 * If Maxmem has been increased beyond what the system has detected, 934 * extend the last memory segment to the new limit. 935 */ 936 if (atop(physmap[physmap_idx + 1]) < Maxmem) 937 physmap[physmap_idx + 1] = ptoa((vm_paddr_t)Maxmem); 938 939 /* call pmap initialization to make new kernel address space */ 940 pmap_bootstrap(&first); 941 942 /* 943 * Size up each available chunk of physical memory. 944 */ 945 physmap[0] = PAGE_SIZE; /* mask off page 0 */ 946 pa_indx = 0; 947 phys_avail[pa_indx++] = physmap[0]; 948 phys_avail[pa_indx] = physmap[0]; 949 pte = CMAP1; 950 951 /* 952 * physmap is in bytes, so when converting to page boundaries, 953 * round up the start address and round down the end address. 954 */ 955 for (i = 0; i <= physmap_idx; i += 2) { 956 vm_paddr_t end; 957 958 end = ptoa((vm_paddr_t)Maxmem); 959 if (physmap[i + 1] < end) 960 end = trunc_page(physmap[i + 1]); 961 for (pa = round_page(physmap[i]); pa < end; pa += PAGE_SIZE) { 962 int tmp, page_bad; 963 int *ptr = (int *)CADDR1; 964 965 /* 966 * block out kernel memory as not available. 967 */ 968 if (pa >= 0x100000 && pa < first) 969 continue; 970 971 page_bad = FALSE; 972 973 /* 974 * map page into kernel: valid, read/write,non-cacheable 975 */ 976 *pte = pa | PG_V | PG_RW | PG_N; 977 invltlb(); 978 979 tmp = *(int *)ptr; 980 /* 981 * Test for alternating 1's and 0's 982 */ 983 *(volatile int *)ptr = 0xaaaaaaaa; 984 if (*(volatile int *)ptr != 0xaaaaaaaa) { 985 page_bad = TRUE; 986 } 987 /* 988 * Test for alternating 0's and 1's 989 */ 990 *(volatile int *)ptr = 0x55555555; 991 if (*(volatile int *)ptr != 0x55555555) { 992 page_bad = TRUE; 993 } 994 /* 995 * Test for all 1's 996 */ 997 *(volatile int *)ptr = 0xffffffff; 998 if (*(volatile int *)ptr != 0xffffffff) { 999 page_bad = TRUE; 1000 } 1001 /* 1002 * Test for all 0's 1003 */ 1004 *(volatile int *)ptr = 0x0; 1005 if (*(volatile int *)ptr != 0x0) { 1006 page_bad = TRUE; 1007 } 1008 /* 1009 * Restore original value. 1010 */ 1011 *(int *)ptr = tmp; 1012 1013 /* 1014 * Adjust array of valid/good pages. 1015 */ 1016 if (page_bad == TRUE) { 1017 continue; 1018 } 1019 /* 1020 * If this good page is a continuation of the 1021 * previous set of good pages, then just increase 1022 * the end pointer. Otherwise start a new chunk. 1023 * Note that "end" points one higher than end, 1024 * making the range >= start and < end. 1025 * If we're also doing a speculative memory 1026 * test and we at or past the end, bump up Maxmem 1027 * so that we keep going. The first bad page 1028 * will terminate the loop. 1029 */ 1030 if (phys_avail[pa_indx] == pa) { 1031 phys_avail[pa_indx] += PAGE_SIZE; 1032 } else { 1033 pa_indx++; 1034 if (pa_indx == PHYS_AVAIL_ARRAY_END) { 1035 printf( 1036 "Too many holes in the physical address space, giving up\n"); 1037 pa_indx--; 1038 break; 1039 } 1040 phys_avail[pa_indx++] = pa; /* start */ 1041 phys_avail[pa_indx] = pa + PAGE_SIZE; /* end */ 1042 } 1043 physmem++; 1044 } 1045 } 1046 *pte = 0; 1047 invltlb(); 1048 1049 /* 1050 * XXX 1051 * The last chunk must contain at least one page plus the message 1052 * buffer to avoid complicating other code (message buffer address 1053 * calculation, etc.). 1054 */ 1055 while (phys_avail[pa_indx - 1] + PAGE_SIZE + 1056 round_page(MSGBUF_SIZE) >= phys_avail[pa_indx]) { 1057 physmem -= atop(phys_avail[pa_indx] - phys_avail[pa_indx - 1]); 1058 phys_avail[pa_indx--] = 0; 1059 phys_avail[pa_indx--] = 0; 1060 } 1061 1062 Maxmem = atop(phys_avail[pa_indx]); 1063 1064 /* Trim off space for the message buffer. */ 1065 phys_avail[pa_indx] -= round_page(MSGBUF_SIZE); 1066 1067 avail_end = phys_avail[pa_indx]; 1068 } 1069 1070 u_int64_t 1071 hammer_time(u_int64_t modulep, u_int64_t physfree) 1072 { 1073 caddr_t kmdp; 1074 int gsel_tss, off, x; 1075 struct region_descriptor r_gdt, r_idt; 1076 struct pcpu *pc; 1077 u_int64_t msr; 1078 char *env; 1079 1080 /* Turn on PTE NX (no execute) bit */ 1081 msr = rdmsr(MSR_EFER) | EFER_NXE; 1082 wrmsr(MSR_EFER, msr); 1083 1084 proc0.p_uarea = (struct user *)(physfree + KERNBASE); 1085 bzero(proc0.p_uarea, UAREA_PAGES * PAGE_SIZE); 1086 physfree += UAREA_PAGES * PAGE_SIZE; 1087 thread0.td_kstack = physfree + KERNBASE; 1088 bzero((void *)thread0.td_kstack, KSTACK_PAGES * PAGE_SIZE); 1089 physfree += KSTACK_PAGES * PAGE_SIZE; 1090 thread0.td_pcb = (struct pcb *) 1091 (thread0.td_kstack + KSTACK_PAGES * PAGE_SIZE) - 1; 1092 1093 atdevbase = ISA_HOLE_START + KERNBASE; 1094 1095 /* 1096 * This may be done better later if it gets more high level 1097 * components in it. If so just link td->td_proc here. 1098 */ 1099 proc_linkup(&proc0, &ksegrp0, &kse0, &thread0); 1100 1101 preload_metadata = (caddr_t)(uintptr_t)(modulep + KERNBASE); 1102 preload_bootstrap_relocate(KERNBASE); 1103 kmdp = preload_search_by_type("elf kernel"); 1104 if (kmdp == NULL) 1105 kmdp = preload_search_by_type("elf64 kernel"); 1106 boothowto = MD_FETCH(kmdp, MODINFOMD_HOWTO, int); 1107 kern_envp = MD_FETCH(kmdp, MODINFOMD_ENVP, char *) + KERNBASE; 1108 1109 /* Init basic tunables, hz etc */ 1110 init_param1(); 1111 1112 /* 1113 * make gdt memory segments 1114 */ 1115 gdt_segs[GPROC0_SEL].ssd_base = (uintptr_t)&common_tss; 1116 1117 for (x = 0; x < NGDT; x++) { 1118 if (x != GPROC0_SEL && x != (GPROC0_SEL + 1)) 1119 ssdtosd(&gdt_segs[x], &gdt[x]); 1120 } 1121 ssdtosyssd(&gdt_segs[GPROC0_SEL], (struct system_segment_descriptor *)&gdt[GPROC0_SEL]); 1122 1123 r_gdt.rd_limit = NGDT * sizeof(gdt[0]) - 1; 1124 r_gdt.rd_base = (long) gdt; 1125 lgdt(&r_gdt); 1126 pc = &__pcpu; 1127 1128 wrmsr(MSR_FSBASE, 0); /* User value */ 1129 wrmsr(MSR_GSBASE, (u_int64_t)pc); 1130 wrmsr(MSR_KGSBASE, 0); /* User value while we're in the kernel */ 1131 1132 pcpu_init(pc, 0, sizeof(struct pcpu)); 1133 PCPU_SET(prvspace, pc); 1134 PCPU_SET(curthread, &thread0); 1135 1136 /* 1137 * Initialize mutexes. 1138 * 1139 * icu_lock: in order to allow an interrupt to occur in a critical 1140 * section, to set pcpu->ipending (etc...) properly, we 1141 * must be able to get the icu lock, so it can't be 1142 * under witness. 1143 */ 1144 mutex_init(); 1145 mtx_init(&clock_lock, "clk", NULL, MTX_SPIN | MTX_RECURSE); 1146 mtx_init(&icu_lock, "icu", NULL, MTX_SPIN | MTX_NOWITNESS); 1147 1148 /* exceptions */ 1149 for (x = 0; x < NIDT; x++) 1150 setidt(x, &IDTVEC(rsvd), SDT_SYSIGT, SEL_KPL, 0); 1151 setidt(0, &IDTVEC(div), SDT_SYSIGT, SEL_KPL, 0); 1152 setidt(1, &IDTVEC(dbg), SDT_SYSIGT, SEL_KPL, 0); 1153 setidt(2, &IDTVEC(nmi), SDT_SYSIGT, SEL_KPL, 0); 1154 setidt(3, &IDTVEC(bpt), SDT_SYSIGT, SEL_KPL, 0); 1155 setidt(4, &IDTVEC(ofl), SDT_SYSIGT, SEL_KPL, 0); 1156 setidt(5, &IDTVEC(bnd), SDT_SYSIGT, SEL_KPL, 0); 1157 setidt(6, &IDTVEC(ill), SDT_SYSIGT, SEL_KPL, 0); 1158 setidt(7, &IDTVEC(dna), SDT_SYSIGT, SEL_KPL, 0); 1159 setidt(8, &IDTVEC(dblfault), SDT_SYSIGT, SEL_KPL, 1); 1160 setidt(9, &IDTVEC(fpusegm), SDT_SYSIGT, SEL_KPL, 0); 1161 setidt(10, &IDTVEC(tss), SDT_SYSIGT, SEL_KPL, 0); 1162 setidt(11, &IDTVEC(missing), SDT_SYSIGT, SEL_KPL, 0); 1163 setidt(12, &IDTVEC(stk), SDT_SYSIGT, SEL_KPL, 0); 1164 setidt(13, &IDTVEC(prot), SDT_SYSIGT, SEL_KPL, 0); 1165 setidt(14, &IDTVEC(page), SDT_SYSIGT, SEL_KPL, 0); 1166 setidt(15, &IDTVEC(rsvd), SDT_SYSIGT, SEL_KPL, 0); 1167 setidt(16, &IDTVEC(fpu), SDT_SYSIGT, SEL_KPL, 0); 1168 setidt(17, &IDTVEC(align), SDT_SYSIGT, SEL_KPL, 0); 1169 setidt(18, &IDTVEC(mchk), SDT_SYSIGT, SEL_KPL, 0); 1170 setidt(19, &IDTVEC(xmm), SDT_SYSIGT, SEL_KPL, 0); 1171 1172 r_idt.rd_limit = sizeof(idt0) - 1; 1173 r_idt.rd_base = (long) idt; 1174 lidt(&r_idt); 1175 1176 /* 1177 * Initialize the console before we print anything out. 1178 */ 1179 cninit(); 1180 1181 #ifdef DEV_ISA 1182 isa_defaultirq(); 1183 #endif 1184 1185 #ifdef DDB 1186 kdb_init(); 1187 if (boothowto & RB_KDB) 1188 Debugger("Boot flags requested debugger"); 1189 #endif 1190 1191 identify_cpu(); /* Final stage of CPU initialization */ 1192 initializecpu(); /* Initialize CPU registers */ 1193 1194 /* make an initial tss so cpu can get interrupt stack on syscall! */ 1195 common_tss.tss_rsp0 = thread0.td_kstack + KSTACK_PAGES * PAGE_SIZE - sizeof(struct pcb); 1196 1197 /* doublefault stack space, runs on ist1 */ 1198 common_tss.tss_ist1 = (long)&dblfault_stack[sizeof(dblfault_stack)]; 1199 1200 gsel_tss = GSEL(GPROC0_SEL, SEL_KPL); 1201 ltr(gsel_tss); 1202 1203 /* Set up the fast syscall stuff */ 1204 msr = rdmsr(MSR_EFER) | EFER_SCE; 1205 wrmsr(MSR_EFER, msr); 1206 wrmsr(MSR_LSTAR, (u_int64_t)IDTVEC(fast_syscall)); 1207 wrmsr(MSR_CSTAR, (u_int64_t)IDTVEC(fast_syscall32)); 1208 msr = ((u_int64_t)GSEL(GCODE_SEL, SEL_KPL) << 32) | 1209 ((u_int64_t)GSEL(GUCODE32_SEL, SEL_UPL) << 48); 1210 wrmsr(MSR_STAR, msr); 1211 wrmsr(MSR_SF_MASK, PSL_NT|PSL_T|PSL_I|PSL_C|PSL_D); 1212 1213 getmemsize(kmdp, physfree); 1214 init_param2(physmem); 1215 1216 /* now running on new page tables, configured,and u/iom is accessible */ 1217 1218 /* Map the message buffer. */ 1219 for (off = 0; off < round_page(MSGBUF_SIZE); off += PAGE_SIZE) 1220 pmap_kenter((vm_offset_t)msgbufp + off, avail_end + off); 1221 1222 msgbufinit(msgbufp, MSGBUF_SIZE); 1223 1224 /* transfer to user mode */ 1225 1226 _ucodesel = GSEL(GUCODE_SEL, SEL_UPL); 1227 _udatasel = GSEL(GUDATA_SEL, SEL_UPL); 1228 _ucode32sel = GSEL(GUCODE32_SEL, SEL_UPL); 1229 1230 /* setup proc 0's pcb */ 1231 thread0.td_pcb->pcb_flags = 0; /* XXXKSE */ 1232 thread0.td_pcb->pcb_cr3 = KPML4phys; 1233 thread0.td_frame = &proc0_tf; 1234 1235 env = getenv("kernelname"); 1236 if (env != NULL) 1237 strlcpy(kernelname, env, sizeof(kernelname)); 1238 1239 /* Location of kernel stack for locore */ 1240 return ((u_int64_t)thread0.td_pcb); 1241 } 1242 1243 void 1244 cpu_pcpu_init(struct pcpu *pcpu, int cpuid, size_t size) 1245 { 1246 } 1247 1248 int 1249 ptrace_set_pc(struct thread *td, unsigned long addr) 1250 { 1251 td->td_frame->tf_rip = addr; 1252 return (0); 1253 } 1254 1255 int 1256 ptrace_single_step(struct thread *td) 1257 { 1258 td->td_frame->tf_rflags |= PSL_T; 1259 return (0); 1260 } 1261 1262 int 1263 fill_regs(struct thread *td, struct reg *regs) 1264 { 1265 struct pcb *pcb; 1266 struct trapframe *tp; 1267 1268 tp = td->td_frame; 1269 regs->r_r15 = tp->tf_r15; 1270 regs->r_r14 = tp->tf_r14; 1271 regs->r_r13 = tp->tf_r13; 1272 regs->r_r12 = tp->tf_r12; 1273 regs->r_r11 = tp->tf_r11; 1274 regs->r_r10 = tp->tf_r10; 1275 regs->r_r9 = tp->tf_r9; 1276 regs->r_r8 = tp->tf_r8; 1277 regs->r_rdi = tp->tf_rdi; 1278 regs->r_rsi = tp->tf_rsi; 1279 regs->r_rbp = tp->tf_rbp; 1280 regs->r_rbx = tp->tf_rbx; 1281 regs->r_rdx = tp->tf_rdx; 1282 regs->r_rcx = tp->tf_rcx; 1283 regs->r_rax = tp->tf_rax; 1284 regs->r_rip = tp->tf_rip; 1285 regs->r_cs = tp->tf_cs; 1286 regs->r_rflags = tp->tf_rflags; 1287 regs->r_rsp = tp->tf_rsp; 1288 regs->r_ss = tp->tf_ss; 1289 pcb = td->td_pcb; 1290 return (0); 1291 } 1292 1293 int 1294 set_regs(struct thread *td, struct reg *regs) 1295 { 1296 struct pcb *pcb; 1297 struct trapframe *tp; 1298 1299 tp = td->td_frame; 1300 if (!EFL_SECURE(regs->r_rflags, tp->tf_rflags) || 1301 !CS_SECURE(regs->r_cs)) 1302 return (EINVAL); 1303 tp->tf_r15 = regs->r_r15; 1304 tp->tf_r14 = regs->r_r14; 1305 tp->tf_r13 = regs->r_r13; 1306 tp->tf_r12 = regs->r_r12; 1307 tp->tf_r11 = regs->r_r11; 1308 tp->tf_r10 = regs->r_r10; 1309 tp->tf_r9 = regs->r_r9; 1310 tp->tf_r8 = regs->r_r8; 1311 tp->tf_rdi = regs->r_rdi; 1312 tp->tf_rsi = regs->r_rsi; 1313 tp->tf_rbp = regs->r_rbp; 1314 tp->tf_rbx = regs->r_rbx; 1315 tp->tf_rdx = regs->r_rdx; 1316 tp->tf_rcx = regs->r_rcx; 1317 tp->tf_rax = regs->r_rax; 1318 tp->tf_rip = regs->r_rip; 1319 tp->tf_cs = regs->r_cs; 1320 tp->tf_rflags = regs->r_rflags; 1321 tp->tf_rsp = regs->r_rsp; 1322 tp->tf_ss = regs->r_ss; 1323 pcb = td->td_pcb; 1324 return (0); 1325 } 1326 1327 /* XXX check all this stuff! */ 1328 /* externalize from sv_xmm */ 1329 static void 1330 fill_fpregs_xmm(struct savefpu *sv_xmm, struct fpreg *fpregs) 1331 { 1332 struct envxmm *penv_fpreg = (struct envxmm *)&fpregs->fpr_env; 1333 struct envxmm *penv_xmm = &sv_xmm->sv_env; 1334 int i; 1335 1336 /* pcb -> fpregs */ 1337 bzero(fpregs, sizeof(*fpregs)); 1338 1339 /* FPU control/status */ 1340 penv_fpreg->en_cw = penv_xmm->en_cw; 1341 penv_fpreg->en_sw = penv_xmm->en_sw; 1342 penv_fpreg->en_tw = penv_xmm->en_tw; 1343 penv_fpreg->en_opcode = penv_xmm->en_opcode; 1344 penv_fpreg->en_rip = penv_xmm->en_rip; 1345 penv_fpreg->en_rdp = penv_xmm->en_rdp; 1346 penv_fpreg->en_mxcsr = penv_xmm->en_mxcsr; 1347 penv_fpreg->en_mxcsr_mask = penv_xmm->en_mxcsr_mask; 1348 1349 /* FPU registers */ 1350 for (i = 0; i < 8; ++i) 1351 bcopy(sv_xmm->sv_fp[i].fp_acc.fp_bytes, fpregs->fpr_acc[i], 10); 1352 1353 /* SSE registers */ 1354 for (i = 0; i < 16; ++i) 1355 bcopy(sv_xmm->sv_xmm[i].xmm_bytes, fpregs->fpr_xacc[i], 16); 1356 } 1357 1358 /* internalize from fpregs into sv_xmm */ 1359 static void 1360 set_fpregs_xmm(struct fpreg *fpregs, struct savefpu *sv_xmm) 1361 { 1362 struct envxmm *penv_xmm = &sv_xmm->sv_env; 1363 struct envxmm *penv_fpreg = (struct envxmm *)&fpregs->fpr_env; 1364 int i; 1365 1366 /* fpregs -> pcb */ 1367 /* FPU control/status */ 1368 penv_xmm->en_cw = penv_fpreg->en_cw; 1369 penv_xmm->en_sw = penv_fpreg->en_sw; 1370 penv_xmm->en_tw = penv_fpreg->en_tw; 1371 penv_xmm->en_opcode = penv_fpreg->en_opcode; 1372 penv_xmm->en_rip = penv_fpreg->en_rip; 1373 penv_xmm->en_rdp = penv_fpreg->en_rdp; 1374 penv_xmm->en_mxcsr = penv_fpreg->en_mxcsr; 1375 penv_xmm->en_mxcsr_mask = penv_fpreg->en_mxcsr_mask; 1376 1377 /* FPU registers */ 1378 for (i = 0; i < 8; ++i) 1379 bcopy(fpregs->fpr_acc[i], sv_xmm->sv_fp[i].fp_acc.fp_bytes, 10); 1380 1381 /* SSE registers */ 1382 for (i = 0; i < 16; ++i) 1383 bcopy(fpregs->fpr_xacc[i], sv_xmm->sv_xmm[i].xmm_bytes, 16); 1384 } 1385 1386 /* externalize from td->pcb */ 1387 int 1388 fill_fpregs(struct thread *td, struct fpreg *fpregs) 1389 { 1390 1391 fill_fpregs_xmm(&td->td_pcb->pcb_save, fpregs); 1392 return (0); 1393 } 1394 1395 /* internalize to td->pcb */ 1396 int 1397 set_fpregs(struct thread *td, struct fpreg *fpregs) 1398 { 1399 1400 set_fpregs_xmm(fpregs, &td->td_pcb->pcb_save); 1401 return (0); 1402 } 1403 1404 /* 1405 * Get machine context. 1406 */ 1407 int 1408 get_mcontext(struct thread *td, mcontext_t *mcp, int clear_ret) 1409 { 1410 struct trapframe *tp; 1411 1412 tp = td->td_frame; 1413 1414 PROC_LOCK(curthread->td_proc); 1415 mcp->mc_onstack = sigonstack(tp->tf_rsp); 1416 PROC_UNLOCK(curthread->td_proc); 1417 mcp->mc_r15 = tp->tf_r15; 1418 mcp->mc_r14 = tp->tf_r14; 1419 mcp->mc_r13 = tp->tf_r13; 1420 mcp->mc_r12 = tp->tf_r12; 1421 mcp->mc_r11 = tp->tf_r11; 1422 mcp->mc_r10 = tp->tf_r10; 1423 mcp->mc_r9 = tp->tf_r9; 1424 mcp->mc_r8 = tp->tf_r8; 1425 mcp->mc_rdi = tp->tf_rdi; 1426 mcp->mc_rsi = tp->tf_rsi; 1427 mcp->mc_rbp = tp->tf_rbp; 1428 mcp->mc_rbx = tp->tf_rbx; 1429 mcp->mc_rcx = tp->tf_rcx; 1430 if (clear_ret != 0) { 1431 mcp->mc_rax = 0; 1432 mcp->mc_rdx = 0; 1433 } else { 1434 mcp->mc_rax = tp->tf_rax; 1435 mcp->mc_rdx = tp->tf_rdx; 1436 } 1437 mcp->mc_rip = tp->tf_rip; 1438 mcp->mc_cs = tp->tf_cs; 1439 mcp->mc_rflags = tp->tf_rflags; 1440 mcp->mc_rsp = tp->tf_rsp; 1441 mcp->mc_ss = tp->tf_ss; 1442 mcp->mc_len = sizeof(*mcp); 1443 get_fpcontext(td, mcp); 1444 return (0); 1445 } 1446 1447 /* 1448 * Set machine context. 1449 * 1450 * However, we don't set any but the user modifiable flags, and we won't 1451 * touch the cs selector. 1452 */ 1453 int 1454 set_mcontext(struct thread *td, const mcontext_t *mcp) 1455 { 1456 struct trapframe *tp; 1457 long rflags; 1458 int ret; 1459 1460 tp = td->td_frame; 1461 if (mcp->mc_len != sizeof(*mcp)) 1462 return (EINVAL); 1463 rflags = (mcp->mc_rflags & PSL_USERCHANGE) | 1464 (tp->tf_rflags & ~PSL_USERCHANGE); 1465 if ((ret = set_fpcontext(td, mcp)) == 0) { 1466 tp->tf_r15 = mcp->mc_r15; 1467 tp->tf_r14 = mcp->mc_r14; 1468 tp->tf_r13 = mcp->mc_r13; 1469 tp->tf_r12 = mcp->mc_r12; 1470 tp->tf_r11 = mcp->mc_r11; 1471 tp->tf_r10 = mcp->mc_r10; 1472 tp->tf_r9 = mcp->mc_r9; 1473 tp->tf_r8 = mcp->mc_r8; 1474 tp->tf_rdi = mcp->mc_rdi; 1475 tp->tf_rsi = mcp->mc_rsi; 1476 tp->tf_rbp = mcp->mc_rbp; 1477 tp->tf_rbx = mcp->mc_rbx; 1478 tp->tf_rdx = mcp->mc_rdx; 1479 tp->tf_rcx = mcp->mc_rcx; 1480 tp->tf_rax = mcp->mc_rax; 1481 tp->tf_rip = mcp->mc_rip; 1482 tp->tf_rflags = rflags; 1483 tp->tf_rsp = mcp->mc_rsp; 1484 tp->tf_ss = mcp->mc_ss; 1485 ret = 0; 1486 } 1487 return (ret); 1488 } 1489 1490 static void 1491 get_fpcontext(struct thread *td, mcontext_t *mcp) 1492 { 1493 struct savefpu *addr; 1494 1495 /* 1496 * XXX mc_fpstate might be misaligned, since its declaration is not 1497 * unportabilized using __attribute__((aligned(16))) like the 1498 * declaration of struct savemm, and anyway, alignment doesn't work 1499 * for auto variables since we don't use gcc's pessimal stack 1500 * alignment. Work around this by abusing the spare fields after 1501 * mcp->mc_fpstate. 1502 * 1503 * XXX unpessimize most cases by only aligning when fxsave might be 1504 * called, although this requires knowing too much about 1505 * npxgetregs()'s internals. 1506 */ 1507 addr = (struct savefpu *)&mcp->mc_fpstate; 1508 if (td == PCPU_GET(fpcurthread) && ((uintptr_t)(void *)addr & 0xF)) { 1509 do 1510 addr = (void *)((char *)addr + 4); 1511 while ((uintptr_t)(void *)addr & 0xF); 1512 } 1513 mcp->mc_ownedfp = npxgetregs(td, addr); 1514 if (addr != (struct savefpu *)&mcp->mc_fpstate) { 1515 bcopy(addr, &mcp->mc_fpstate, sizeof(mcp->mc_fpstate)); 1516 bzero(&mcp->mc_spare2, sizeof(mcp->mc_spare2)); 1517 } 1518 mcp->mc_fpformat = npxformat(); 1519 } 1520 1521 static int 1522 set_fpcontext(struct thread *td, const mcontext_t *mcp) 1523 { 1524 struct savefpu *addr; 1525 1526 if (mcp->mc_fpformat == _MC_FPFMT_NODEV) 1527 return (0); 1528 else if (mcp->mc_fpformat != _MC_FPFMT_XMM) 1529 return (EINVAL); 1530 else if (mcp->mc_ownedfp == _MC_FPOWNED_NONE) 1531 /* We don't care what state is left in the FPU or PCB. */ 1532 fpstate_drop(td); 1533 else if (mcp->mc_ownedfp == _MC_FPOWNED_FPU || 1534 mcp->mc_ownedfp == _MC_FPOWNED_PCB) { 1535 /* XXX align as above. */ 1536 addr = (struct savefpu *)&mcp->mc_fpstate; 1537 if (td == PCPU_GET(fpcurthread) && 1538 ((uintptr_t)(void *)addr & 0xF)) { 1539 do 1540 addr = (void *)((char *)addr + 4); 1541 while ((uintptr_t)(void *)addr & 0xF); 1542 bcopy(&mcp->mc_fpstate, addr, sizeof(mcp->mc_fpstate)); 1543 } 1544 /* 1545 * XXX we violate the dubious requirement that npxsetregs() 1546 * be called with interrupts disabled. 1547 */ 1548 npxsetregs(td, addr); 1549 /* 1550 * Don't bother putting things back where they were in the 1551 * misaligned case, since we know that the caller won't use 1552 * them again. 1553 */ 1554 } else 1555 return (EINVAL); 1556 return (0); 1557 } 1558 1559 void 1560 fpstate_drop(struct thread *td) 1561 { 1562 register_t s; 1563 1564 s = intr_disable(); 1565 if (PCPU_GET(fpcurthread) == td) 1566 npxdrop(); 1567 /* 1568 * XXX force a full drop of the npx. The above only drops it if we 1569 * owned it. 1570 * 1571 * XXX I don't much like npxgetregs()'s semantics of doing a full 1572 * drop. Dropping only to the pcb matches fnsave's behaviour. 1573 * We only need to drop to !PCB_INITDONE in sendsig(). But 1574 * sendsig() is the only caller of npxgetregs()... perhaps we just 1575 * have too many layers. 1576 */ 1577 curthread->td_pcb->pcb_flags &= ~PCB_NPXINITDONE; 1578 intr_restore(s); 1579 } 1580 1581 int 1582 fill_dbregs(struct thread *td, struct dbreg *dbregs) 1583 { 1584 1585 return (0); 1586 } 1587 1588 int 1589 set_dbregs(struct thread *td, struct dbreg *dbregs) 1590 { 1591 1592 return (0); 1593 } 1594 1595 #ifndef DDB 1596 void 1597 Debugger(const char *msg) 1598 { 1599 printf("Debugger(\"%s\") called.\n", msg); 1600 } 1601 #endif /* no DDB */ 1602 1603 #ifdef DDB 1604 1605 /* 1606 * Provide inb() and outb() as functions. They are normally only 1607 * available as macros calling inlined functions, thus cannot be 1608 * called inside DDB. 1609 * 1610 * The actual code is stolen from <machine/cpufunc.h>, and de-inlined. 1611 */ 1612 1613 #undef inb 1614 #undef outb 1615 1616 /* silence compiler warnings */ 1617 u_char inb(u_int); 1618 void outb(u_int, u_char); 1619 1620 u_char 1621 inb(u_int port) 1622 { 1623 u_char data; 1624 /* 1625 * We use %%dx and not %1 here because i/o is done at %dx and not at 1626 * %edx, while gcc generates inferior code (movw instead of movl) 1627 * if we tell it to load (u_short) port. 1628 */ 1629 __asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port)); 1630 return (data); 1631 } 1632 1633 void 1634 outb(u_int port, u_char data) 1635 { 1636 u_char al; 1637 /* 1638 * Use an unnecessary assignment to help gcc's register allocator. 1639 * This make a large difference for gcc-1.40 and a tiny difference 1640 * for gcc-2.6.0. For gcc-1.40, al had to be ``asm("ax")'' for 1641 * best results. gcc-2.6.0 can't handle this. 1642 */ 1643 al = data; 1644 __asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port)); 1645 } 1646 1647 #endif /* DDB */
Cache object: b918525c11cdeb7b202c4af091c279e7
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]