Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
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 * $FreeBSD$ 39 */ 40 41 #include "apm.h" 42 #include "ether.h" 43 #include "npx.h" 44 #include "opt_atalk.h" 45 #include "opt_cpu.h" 46 #include "opt_ddb.h" 47 #include "opt_inet.h" 48 #include "opt_ipx.h" 49 #include "opt_maxmem.h" 50 #include "opt_msgbuf.h" 51 #include "opt_perfmon.h" 52 #include "opt_smp.h" 53 #include "opt_sysvipc.h" 54 #include "opt_user_ldt.h" 55 #include "opt_userconfig.h" 56 #include "opt_vm86.h" 57 58 #include <sys/param.h> 59 #include <sys/systm.h> 60 #include <sys/sysproto.h> 61 #include <sys/signalvar.h> 62 #include <sys/kernel.h> 63 #include <sys/linker.h> 64 #include <sys/proc.h> 65 #include <sys/buf.h> 66 #include <sys/reboot.h> 67 #include <sys/callout.h> 68 #include <sys/malloc.h> 69 #include <sys/mbuf.h> 70 #include <sys/msgbuf.h> 71 #include <sys/sysent.h> 72 #include <sys/sysctl.h> 73 #include <sys/vmmeter.h> 74 75 #ifdef SYSVSHM 76 #include <sys/shm.h> 77 #endif 78 79 #ifdef SYSVMSG 80 #include <sys/msg.h> 81 #endif 82 83 #ifdef SYSVSEM 84 #include <sys/sem.h> 85 #endif 86 87 #include <vm/vm.h> 88 #include <vm/vm_param.h> 89 #include <vm/vm_prot.h> 90 #include <sys/lock.h> 91 #include <vm/vm_kern.h> 92 #include <vm/vm_object.h> 93 #include <vm/vm_page.h> 94 #include <vm/vm_map.h> 95 #include <vm/vm_pager.h> 96 #include <vm/vm_extern.h> 97 98 #include <sys/user.h> 99 #include <sys/exec.h> 100 101 #include <ddb/ddb.h> 102 103 #if defined(INET) || defined(IPX) || defined(NATM) || defined(NETATALK) \ 104 || NETHER > 0 || defined(NS) 105 #define NETISR 106 #endif 107 108 #ifdef NETISR 109 #include <net/netisr.h> 110 #endif 111 112 #include <machine/cpu.h> 113 #include <machine/reg.h> 114 #include <machine/clock.h> 115 #include <machine/specialreg.h> 116 #include <machine/cons.h> 117 #include <machine/bootinfo.h> 118 #include <machine/ipl.h> 119 #include <machine/md_var.h> 120 #include <machine/pcb_ext.h> /* pcb.h included via sys/user.h */ 121 #ifdef SMP 122 #include <machine/smp.h> 123 #endif 124 #ifdef PERFMON 125 #include <machine/perfmon.h> 126 #endif 127 128 #include <i386/isa/isa_device.h> 129 #include <i386/isa/intr_machdep.h> 130 #ifndef VM86 131 #include <i386/isa/rtc.h> 132 #endif 133 #include <machine/random.h> 134 #include <sys/ptrace.h> 135 136 extern void init386 __P((int first)); 137 extern void dblfault_handler __P((void)); 138 139 extern void printcpuinfo(void); /* XXX header file */ 140 extern void earlysetcpuclass(void); /* same header file */ 141 extern void finishidentcpu(void); 142 extern void panicifcpuunsupported(void); 143 extern void initializecpu(void); 144 145 static void cpu_startup __P((void *)); 146 SYSINIT(cpu, SI_SUB_CPU, SI_ORDER_FIRST, cpu_startup, NULL) 147 148 static MALLOC_DEFINE(M_MBUF, "mbuf", "mbuf"); 149 150 int _udatasel, _ucodesel; 151 u_int atdevbase; 152 153 #if defined(SWTCH_OPTIM_STATS) 154 extern int swtch_optim_stats; 155 SYSCTL_INT(_debug, OID_AUTO, swtch_optim_stats, 156 CTLFLAG_RD, &swtch_optim_stats, 0, ""); 157 SYSCTL_INT(_debug, OID_AUTO, tlb_flush_count, 158 CTLFLAG_RD, &tlb_flush_count, 0, ""); 159 #endif 160 161 #ifdef PC98 162 static int ispc98 = 1; 163 #else 164 static int ispc98 = 0; 165 #endif 166 SYSCTL_INT(_machdep, OID_AUTO, ispc98, CTLFLAG_RD, &ispc98, 0, ""); 167 168 int physmem = 0; 169 int cold = 1; 170 171 static int 172 sysctl_hw_physmem SYSCTL_HANDLER_ARGS 173 { 174 int error = sysctl_handle_int(oidp, 0, ctob(physmem), req); 175 return (error); 176 } 177 178 SYSCTL_PROC(_hw, HW_PHYSMEM, physmem, CTLTYPE_INT|CTLFLAG_RD, 179 0, 0, sysctl_hw_physmem, "I", ""); 180 181 static int 182 sysctl_hw_usermem SYSCTL_HANDLER_ARGS 183 { 184 int error = sysctl_handle_int(oidp, 0, 185 ctob(physmem - cnt.v_wire_count), req); 186 return (error); 187 } 188 189 SYSCTL_PROC(_hw, HW_USERMEM, usermem, CTLTYPE_INT|CTLFLAG_RD, 190 0, 0, sysctl_hw_usermem, "I", ""); 191 192 static int 193 sysctl_hw_availpages SYSCTL_HANDLER_ARGS 194 { 195 int error = sysctl_handle_int(oidp, 0, 196 i386_btop(avail_end - avail_start), req); 197 return (error); 198 } 199 200 SYSCTL_PROC(_hw, OID_AUTO, availpages, CTLTYPE_INT|CTLFLAG_RD, 201 0, 0, sysctl_hw_availpages, "I", ""); 202 203 static int 204 sysctl_machdep_msgbuf SYSCTL_HANDLER_ARGS 205 { 206 int error; 207 208 /* Unwind the buffer, so that it's linear (possibly starting with 209 * some initial nulls). 210 */ 211 error=sysctl_handle_opaque(oidp,msgbufp->msg_ptr+msgbufp->msg_bufr, 212 msgbufp->msg_size-msgbufp->msg_bufr,req); 213 if(error) return(error); 214 if(msgbufp->msg_bufr>0) { 215 error=sysctl_handle_opaque(oidp,msgbufp->msg_ptr, 216 msgbufp->msg_bufr,req); 217 } 218 return(error); 219 } 220 221 SYSCTL_PROC(_machdep, OID_AUTO, msgbuf, CTLTYPE_STRING|CTLFLAG_RD, 222 0, 0, sysctl_machdep_msgbuf, "A","Contents of kernel message buffer"); 223 224 static int msgbuf_clear; 225 226 static int 227 sysctl_machdep_msgbuf_clear SYSCTL_HANDLER_ARGS 228 { 229 int error; 230 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, 231 req); 232 if (!error && req->newptr) { 233 /* Clear the buffer and reset write pointer */ 234 bzero(msgbufp->msg_ptr,msgbufp->msg_size); 235 msgbufp->msg_bufr=msgbufp->msg_bufx=0; 236 msgbuf_clear=0; 237 } 238 return (error); 239 } 240 241 SYSCTL_PROC(_machdep, OID_AUTO, msgbuf_clear, CTLTYPE_INT|CTLFLAG_RW, 242 &msgbuf_clear, 0, sysctl_machdep_msgbuf_clear, "I", 243 "Clear kernel message buffer"); 244 245 int bootverbose = 0, Maxmem = 0; 246 long dumplo; 247 248 vm_offset_t phys_avail[10]; 249 250 /* must be 2 less so 0 0 can signal end of chunks */ 251 #define PHYS_AVAIL_ARRAY_END ((sizeof(phys_avail) / sizeof(vm_offset_t)) - 2) 252 253 #ifdef NETISR 254 static void setup_netisrs __P((struct linker_set *)); 255 #endif 256 257 static vm_offset_t buffer_sva, buffer_eva; 258 vm_offset_t clean_sva, clean_eva; 259 static vm_offset_t pager_sva, pager_eva; 260 #ifdef NETISR 261 extern struct linker_set netisr_set; 262 #endif 263 #if NNPX > 0 264 extern struct isa_driver npxdriver; 265 #endif 266 267 #define offsetof(type, member) ((size_t)(&((type *)0)->member)) 268 269 static void 270 cpu_startup(dummy) 271 void *dummy; 272 { 273 register unsigned i; 274 register caddr_t v; 275 vm_offset_t maxaddr; 276 vm_size_t size = 0; 277 int firstaddr; 278 vm_offset_t minaddr; 279 280 if (boothowto & RB_VERBOSE) 281 bootverbose++; 282 283 /* 284 * Good {morning,afternoon,evening,night}. 285 */ 286 printf(version); 287 earlysetcpuclass(); 288 startrtclock(); 289 printcpuinfo(); 290 panicifcpuunsupported(); 291 #ifdef PERFMON 292 perfmon_init(); 293 #endif 294 printf("real memory = %u (%uK bytes)\n", ptoa(Maxmem), ptoa(Maxmem) / 1024); 295 /* 296 * Display any holes after the first chunk of extended memory. 297 */ 298 if (bootverbose) { 299 int indx; 300 301 printf("Physical memory chunk(s):\n"); 302 for (indx = 0; phys_avail[indx + 1] != 0; indx += 2) { 303 int size1 = phys_avail[indx + 1] - phys_avail[indx]; 304 305 printf("0x%08x - 0x%08x, %u bytes (%u pages)\n", 306 phys_avail[indx], phys_avail[indx + 1] - 1, size1, 307 size1 / PAGE_SIZE); 308 } 309 } 310 311 #ifdef NETISR 312 /* 313 * Quickly wire in netisrs. 314 */ 315 setup_netisrs(&netisr_set); 316 #endif 317 318 /* 319 * Calculate callout wheel size 320 */ 321 for (callwheelsize = 1, callwheelbits = 0; 322 callwheelsize < ncallout; 323 callwheelsize <<= 1, ++callwheelbits) 324 ; 325 callwheelmask = callwheelsize - 1; 326 327 /* 328 * Allocate space for system data structures. 329 * The first available kernel virtual address is in "v". 330 * As pages of kernel virtual memory are allocated, "v" is incremented. 331 * As pages of memory are allocated and cleared, 332 * "firstaddr" is incremented. 333 * An index into the kernel page table corresponding to the 334 * virtual memory address maintained in "v" is kept in "mapaddr". 335 */ 336 337 /* 338 * Make two passes. The first pass calculates how much memory is 339 * needed and allocates it. The second pass assigns virtual 340 * addresses to the various data structures. 341 */ 342 firstaddr = 0; 343 again: 344 v = (caddr_t)firstaddr; 345 346 #define valloc(name, type, num) \ 347 (name) = (type *)v; v = (caddr_t)((name)+(num)) 348 #define valloclim(name, type, num, lim) \ 349 (name) = (type *)v; v = (caddr_t)((lim) = ((name)+(num))) 350 351 valloc(callout, struct callout, ncallout); 352 valloc(callwheel, struct callout_tailq, callwheelsize); 353 #ifdef SYSVSHM 354 valloc(shmsegs, struct shmid_ds, shminfo.shmmni); 355 #endif 356 #ifdef SYSVSEM 357 valloc(sema, struct semid_ds, seminfo.semmni); 358 valloc(sem, struct sem, seminfo.semmns); 359 /* This is pretty disgusting! */ 360 valloc(semu, int, (seminfo.semmnu * seminfo.semusz) / sizeof(int)); 361 #endif 362 #ifdef SYSVMSG 363 valloc(msgpool, char, msginfo.msgmax); 364 valloc(msgmaps, struct msgmap, msginfo.msgseg); 365 valloc(msghdrs, struct msg, msginfo.msgtql); 366 valloc(msqids, struct msqid_ds, msginfo.msgmni); 367 #endif 368 369 if (nbuf == 0) { 370 nbuf = 30; 371 if( physmem > 1024) 372 nbuf += min((physmem - 1024) / 8, 2048); 373 } 374 nswbuf = max(min(nbuf/4, 64), 16); 375 376 valloc(swbuf, struct buf, nswbuf); 377 valloc(buf, struct buf, nbuf); 378 379 380 /* 381 * End of first pass, size has been calculated so allocate memory 382 */ 383 if (firstaddr == 0) { 384 size = (vm_size_t)(v - firstaddr); 385 firstaddr = (int)kmem_alloc(kernel_map, round_page(size)); 386 if (firstaddr == 0) 387 panic("startup: no room for tables"); 388 goto again; 389 } 390 391 /* 392 * End of second pass, addresses have been assigned 393 */ 394 if ((vm_size_t)(v - firstaddr) != size) 395 panic("startup: table size inconsistency"); 396 397 clean_map = kmem_suballoc(kernel_map, &clean_sva, &clean_eva, 398 (nbuf*BKVASIZE) + (nswbuf*MAXPHYS) + pager_map_size); 399 buffer_map = kmem_suballoc(clean_map, &buffer_sva, &buffer_eva, 400 (nbuf*BKVASIZE)); 401 pager_map = kmem_suballoc(clean_map, &pager_sva, &pager_eva, 402 (nswbuf*MAXPHYS) + pager_map_size); 403 pager_map->system_map = 1; 404 exec_map = kmem_suballoc(kernel_map, &minaddr, &maxaddr, 405 (16*(ARG_MAX+(PAGE_SIZE*3)))); 406 407 /* 408 * Finally, allocate mbuf pool. Since mclrefcnt is an off-size 409 * we use the more space efficient malloc in place of kmem_alloc. 410 */ 411 { 412 vm_offset_t mb_map_size; 413 int xclusters; 414 415 /* Allow override of NMBCLUSTERS from the kernel environment */ 416 if (getenv_int("kern.ipc.nmbclusters", &xclusters) && 417 xclusters > nmbclusters) 418 nmbclusters = xclusters; 419 420 mb_map_size = nmbufs * MSIZE + nmbclusters * MCLBYTES; 421 mb_map_size = roundup2(mb_map_size, max(MCLBYTES, PAGE_SIZE)); 422 mclrefcnt = malloc(mb_map_size / MCLBYTES, M_MBUF, M_NOWAIT); 423 bzero(mclrefcnt, mb_map_size / MCLBYTES); 424 mb_map = kmem_suballoc(kmem_map, (vm_offset_t *)&mbutl, &maxaddr, 425 mb_map_size); 426 mb_map->system_map = 1; 427 } 428 429 /* 430 * Initialize callouts 431 */ 432 SLIST_INIT(&callfree); 433 for (i = 0; i < ncallout; i++) { 434 callout_init(&callout[i]); 435 callout[i].c_flags = CALLOUT_LOCAL_ALLOC; 436 SLIST_INSERT_HEAD(&callfree, &callout[i], c_links.sle); 437 } 438 439 for (i = 0; i < callwheelsize; i++) { 440 TAILQ_INIT(&callwheel[i]); 441 } 442 443 #if defined(USERCONFIG) 444 userconfig(); 445 cninit(); /* the preferred console may have changed */ 446 #endif 447 448 printf("avail memory = %u (%uK bytes)\n", ptoa(cnt.v_free_count), 449 ptoa(cnt.v_free_count) / 1024); 450 451 /* 452 * Set up buffers, so they can be used to read disk labels. 453 */ 454 bufinit(); 455 vm_pager_bufferinit(); 456 457 #ifdef SMP 458 /* 459 * OK, enough kmem_alloc/malloc state should be up, lets get on with it! 460 */ 461 mp_start(); /* fire up the APs and APICs */ 462 mp_announce(); 463 #endif /* SMP */ 464 } 465 466 #ifdef NETISR 467 int 468 register_netisr(num, handler) 469 int num; 470 netisr_t *handler; 471 { 472 473 if (num < 0 || num >= (sizeof(netisrs)/sizeof(*netisrs)) ) { 474 printf("register_netisr: bad isr number: %d\n", num); 475 return (EINVAL); 476 } 477 netisrs[num] = handler; 478 return (0); 479 } 480 481 static void 482 setup_netisrs(ls) 483 struct linker_set *ls; 484 { 485 int i; 486 const struct netisrtab *nit; 487 488 for(i = 0; ls->ls_items[i]; i++) { 489 nit = (const struct netisrtab *)ls->ls_items[i]; 490 register_netisr(nit->nit_num, nit->nit_isr); 491 } 492 } 493 #endif /* NETISR */ 494 495 /* 496 * Send an interrupt to process. 497 * 498 * Stack is set up to allow sigcode stored 499 * at top to call routine, followed by kcall 500 * to sigreturn routine below. After sigreturn 501 * resets the signal mask, the stack, and the 502 * frame pointer, it returns to the user 503 * specified pc, psl. 504 */ 505 void 506 sendsig(catcher, sig, mask, code) 507 sig_t catcher; 508 int sig, mask; 509 u_long code; 510 { 511 register struct proc *p = curproc; 512 register struct trapframe *regs; 513 register struct sigframe *fp; 514 struct sigframe sf; 515 struct sigacts *psp = p->p_sigacts; 516 int oonstack; 517 518 regs = p->p_md.md_regs; 519 oonstack = psp->ps_sigstk.ss_flags & SS_ONSTACK; 520 /* 521 * Allocate and validate space for the signal handler context. 522 */ 523 if ((psp->ps_flags & SAS_ALTSTACK) && !oonstack && 524 (psp->ps_sigonstack & sigmask(sig))) { 525 fp = (struct sigframe *)(psp->ps_sigstk.ss_sp + 526 psp->ps_sigstk.ss_size - sizeof(struct sigframe)); 527 psp->ps_sigstk.ss_flags |= SS_ONSTACK; 528 } else { 529 fp = (struct sigframe *)regs->tf_esp - 1; 530 } 531 532 /* 533 * grow() will return FALSE if the fp will not fit inside the stack 534 * and the stack can not be grown. useracc will return FALSE 535 * if access is denied. 536 */ 537 #ifdef VM_STACK 538 if ((grow_stack (p, (int)fp) == FALSE) || 539 #else 540 if ((grow(p, (int)fp) == FALSE) || 541 #endif 542 (useracc((caddr_t)fp, sizeof(struct sigframe), B_WRITE) == FALSE)) { 543 /* 544 * Process has trashed its stack; give it an illegal 545 * instruction to halt it in its tracks. 546 */ 547 SIGACTION(p, SIGILL) = SIG_DFL; 548 sig = sigmask(SIGILL); 549 p->p_sigignore &= ~sig; 550 p->p_sigcatch &= ~sig; 551 p->p_sigmask &= ~sig; 552 psignal(p, SIGILL); 553 return; 554 } 555 556 /* 557 * Build the argument list for the signal handler. 558 */ 559 if (p->p_sysent->sv_sigtbl) { 560 if (sig < p->p_sysent->sv_sigsize) 561 sig = p->p_sysent->sv_sigtbl[sig]; 562 else 563 sig = p->p_sysent->sv_sigsize + 1; 564 } 565 sf.sf_signum = sig; 566 sf.sf_code = code; 567 sf.sf_scp = &fp->sf_sc; 568 sf.sf_addr = (char *) regs->tf_err; 569 sf.sf_handler = catcher; 570 571 /* save scratch registers */ 572 sf.sf_sc.sc_eax = regs->tf_eax; 573 sf.sf_sc.sc_ebx = regs->tf_ebx; 574 sf.sf_sc.sc_ecx = regs->tf_ecx; 575 sf.sf_sc.sc_edx = regs->tf_edx; 576 sf.sf_sc.sc_esi = regs->tf_esi; 577 sf.sf_sc.sc_edi = regs->tf_edi; 578 sf.sf_sc.sc_cs = regs->tf_cs; 579 sf.sf_sc.sc_ds = regs->tf_ds; 580 sf.sf_sc.sc_ss = regs->tf_ss; 581 sf.sf_sc.sc_es = regs->tf_es; 582 sf.sf_sc.sc_fs = rfs(); 583 sf.sf_sc.sc_gs = rgs(); 584 sf.sf_sc.sc_isp = regs->tf_isp; 585 586 /* 587 * Build the signal context to be used by sigreturn. 588 */ 589 sf.sf_sc.sc_onstack = oonstack; 590 sf.sf_sc.sc_mask = mask; 591 sf.sf_sc.sc_sp = regs->tf_esp; 592 sf.sf_sc.sc_fp = regs->tf_ebp; 593 sf.sf_sc.sc_pc = regs->tf_eip; 594 sf.sf_sc.sc_ps = regs->tf_eflags; 595 sf.sf_sc.sc_trapno = regs->tf_trapno; 596 sf.sf_sc.sc_err = regs->tf_err; 597 598 #ifdef VM86 599 /* 600 * If we're a vm86 process, we want to save the segment registers. 601 * We also change eflags to be our emulated eflags, not the actual 602 * eflags. 603 */ 604 if (regs->tf_eflags & PSL_VM) { 605 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs; 606 struct vm86_kernel *vm86 = &p->p_addr->u_pcb.pcb_ext->ext_vm86; 607 608 sf.sf_sc.sc_gs = tf->tf_vm86_gs; 609 sf.sf_sc.sc_fs = tf->tf_vm86_fs; 610 sf.sf_sc.sc_es = tf->tf_vm86_es; 611 sf.sf_sc.sc_ds = tf->tf_vm86_ds; 612 613 if (vm86->vm86_has_vme == 0) 614 sf.sf_sc.sc_ps = (tf->tf_eflags & ~(PSL_VIF | PSL_VIP)) 615 | (vm86->vm86_eflags & (PSL_VIF | PSL_VIP)); 616 617 /* 618 * We should never have PSL_T set when returning from vm86 619 * mode. It may be set here if we deliver a signal before 620 * getting to vm86 mode, so turn it off. 621 * 622 * Clear PSL_NT to inhibit T_TSSFLT faults on return from 623 * syscalls made by the signal handler. This just avoids 624 * wasting time for our lazy fixup of such faults. PSL_NT 625 * does nothing in vm86 mode, but vm86 programs can set it 626 * almost legitimately in probes for old cpu types. 627 */ 628 tf->tf_eflags &= ~(PSL_VM | PSL_NT | PSL_T | PSL_VIF | PSL_VIP); 629 } 630 #endif /* VM86 */ 631 632 /* 633 * Copy the sigframe out to the user's stack. 634 */ 635 if (copyout(&sf, fp, sizeof(struct sigframe)) != 0) { 636 /* 637 * Something is wrong with the stack pointer. 638 * ...Kill the process. 639 */ 640 sigexit(p, SIGILL); 641 } 642 643 regs->tf_esp = (int)fp; 644 regs->tf_eip = PS_STRINGS - *(p->p_sysent->sv_szsigcode); 645 regs->tf_cs = _ucodesel; 646 regs->tf_ds = _udatasel; 647 regs->tf_es = _udatasel; 648 load_fs(_udatasel); 649 load_gs(_udatasel); 650 regs->tf_ss = _udatasel; 651 } 652 653 /* 654 * System call to cleanup state after a signal 655 * has been taken. Reset signal mask and 656 * stack state from context left by sendsig (above). 657 * Return to previous pc and psl as specified by 658 * context left by sendsig. Check carefully to 659 * make sure that the user has not modified the 660 * state to gain improper privileges. 661 */ 662 int 663 sigreturn(p, uap) 664 struct proc *p; 665 struct sigreturn_args /* { 666 struct sigcontext *sigcntxp; 667 } */ *uap; 668 { 669 register struct sigcontext *scp; 670 register struct sigframe *fp; 671 register struct trapframe *regs = p->p_md.md_regs; 672 int eflags; 673 674 /* 675 * (XXX old comment) regs->tf_esp points to the return address. 676 * The user scp pointer is above that. 677 * The return address is faked in the signal trampoline code 678 * for consistency. 679 */ 680 scp = uap->sigcntxp; 681 fp = (struct sigframe *) 682 ((caddr_t)scp - offsetof(struct sigframe, sf_sc)); 683 684 if (useracc((caddr_t)fp, sizeof (*fp), B_WRITE) == 0) 685 return(EFAULT); 686 687 eflags = scp->sc_ps; 688 #ifdef VM86 689 if (eflags & PSL_VM) { 690 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs; 691 struct vm86_kernel *vm86; 692 693 /* 694 * if pcb_ext == 0 or vm86_inited == 0, the user hasn't 695 * set up the vm86 area, and we can't enter vm86 mode. 696 */ 697 if (p->p_addr->u_pcb.pcb_ext == 0) 698 return (EINVAL); 699 vm86 = &p->p_addr->u_pcb.pcb_ext->ext_vm86; 700 if (vm86->vm86_inited == 0) 701 return (EINVAL); 702 703 /* go back to user mode if both flags are set */ 704 if ((eflags & PSL_VIP) && (eflags & PSL_VIF)) 705 trapsignal(p, SIGBUS, 0); 706 707 if (vm86->vm86_has_vme) { 708 eflags = (tf->tf_eflags & ~VME_USERCHANGE) | 709 (eflags & VME_USERCHANGE) | PSL_VM; 710 } else { 711 vm86->vm86_eflags = eflags; /* save VIF, VIP */ 712 eflags = (tf->tf_eflags & ~VM_USERCHANGE) | (eflags & VM_USERCHANGE) | PSL_VM; 713 } 714 tf->tf_vm86_ds = scp->sc_ds; 715 tf->tf_vm86_es = scp->sc_es; 716 tf->tf_vm86_fs = scp->sc_fs; 717 tf->tf_vm86_gs = scp->sc_gs; 718 tf->tf_ds = _udatasel; 719 tf->tf_es = _udatasel; 720 } else { 721 #endif /* VM86 */ 722 /* 723 * Don't allow users to change privileged or reserved flags. 724 */ 725 #define EFLAGS_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) 726 /* 727 * XXX do allow users to change the privileged flag PSL_RF. 728 * The cpu sets PSL_RF in tf_eflags for faults. Debuggers 729 * should sometimes set it there too. tf_eflags is kept in 730 * the signal context during signal handling and there is no 731 * other place to remember it, so the PSL_RF bit may be 732 * corrupted by the signal handler without us knowing. 733 * Corruption of the PSL_RF bit at worst causes one more or 734 * one less debugger trap, so allowing it is fairly harmless. 735 */ 736 if (!EFLAGS_SECURE(eflags & ~PSL_RF, regs->tf_eflags & ~PSL_RF)) { 737 #ifdef DEBUG 738 printf("sigreturn: eflags = 0x%x\n", eflags); 739 #endif 740 return(EINVAL); 741 } 742 743 /* 744 * Don't allow users to load a valid privileged %cs. Let the 745 * hardware check for invalid selectors, excess privilege in 746 * other selectors, invalid %eip's and invalid %esp's. 747 */ 748 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL) 749 if (!CS_SECURE(scp->sc_cs)) { 750 #ifdef DEBUG 751 printf("sigreturn: cs = 0x%x\n", scp->sc_cs); 752 #endif 753 trapsignal(p, SIGBUS, T_PROTFLT); 754 return(EINVAL); 755 } 756 regs->tf_ds = scp->sc_ds; 757 regs->tf_es = scp->sc_es; 758 #ifdef VM86 759 } 760 #endif 761 762 /* restore scratch registers */ 763 regs->tf_eax = scp->sc_eax; 764 regs->tf_ebx = scp->sc_ebx; 765 regs->tf_ecx = scp->sc_ecx; 766 regs->tf_edx = scp->sc_edx; 767 regs->tf_esi = scp->sc_esi; 768 regs->tf_edi = scp->sc_edi; 769 regs->tf_cs = scp->sc_cs; 770 regs->tf_ss = scp->sc_ss; 771 regs->tf_isp = scp->sc_isp; 772 773 if (useracc((caddr_t)scp, sizeof (*scp), B_WRITE) == 0) 774 return(EINVAL); 775 776 if (scp->sc_onstack & 01) 777 p->p_sigacts->ps_sigstk.ss_flags |= SS_ONSTACK; 778 else 779 p->p_sigacts->ps_sigstk.ss_flags &= ~SS_ONSTACK; 780 p->p_sigmask = scp->sc_mask & ~sigcantmask; 781 regs->tf_ebp = scp->sc_fp; 782 regs->tf_esp = scp->sc_sp; 783 regs->tf_eip = scp->sc_pc; 784 regs->tf_eflags = eflags; 785 return(EJUSTRETURN); 786 } 787 788 /* 789 * Machine dependent boot() routine 790 * 791 * I haven't seen anything to put here yet 792 * Possibly some stuff might be grafted back here from boot() 793 */ 794 void 795 cpu_boot(int howto) 796 { 797 } 798 799 /* 800 * Shutdown the CPU as much as possible 801 */ 802 void 803 cpu_halt(void) 804 { 805 for (;;) 806 __asm__ ("hlt"); 807 } 808 809 /* 810 * Clear registers on exec 811 */ 812 void 813 setregs(p, entry, stack, ps_strings) 814 struct proc *p; 815 u_long entry; 816 u_long stack; 817 u_long ps_strings; 818 { 819 struct trapframe *regs = p->p_md.md_regs; 820 struct pcb *pcb = &p->p_addr->u_pcb; 821 822 #ifdef USER_LDT 823 /* was i386_user_cleanup() in NetBSD */ 824 if (pcb->pcb_ldt) { 825 if (pcb == curpcb) { 826 lldt(_default_ldt); 827 currentldt = _default_ldt; 828 } 829 kmem_free(kernel_map, (vm_offset_t)pcb->pcb_ldt, 830 pcb->pcb_ldt_len * sizeof(union descriptor)); 831 pcb->pcb_ldt_len = (int)pcb->pcb_ldt = 0; 832 } 833 #endif 834 835 bzero((char *)regs, sizeof(struct trapframe)); 836 regs->tf_eip = entry; 837 regs->tf_esp = stack; 838 regs->tf_eflags = PSL_USER | (regs->tf_eflags & PSL_T); 839 regs->tf_ss = _udatasel; 840 regs->tf_ds = _udatasel; 841 regs->tf_es = _udatasel; 842 regs->tf_cs = _ucodesel; 843 844 /* PS_STRINGS value for BSD/OS binaries. It is 0 for non-BSD/OS. */ 845 regs->tf_ebx = ps_strings; 846 847 /* reset %fs and %gs as well */ 848 pcb->pcb_fs = _udatasel; 849 pcb->pcb_gs = _udatasel; 850 if (pcb == curpcb) { 851 __asm("movw %w0,%%fs" : : "r" (_udatasel)); 852 __asm("movw %w0,%%gs" : : "r" (_udatasel)); 853 } 854 855 /* 856 * Initialize the math emulator (if any) for the current process. 857 * Actually, just clear the bit that says that the emulator has 858 * been initialized. Initialization is delayed until the process 859 * traps to the emulator (if it is done at all) mainly because 860 * emulators don't provide an entry point for initialization. 861 */ 862 p->p_addr->u_pcb.pcb_flags &= ~FP_SOFTFP; 863 864 /* 865 * Arrange to trap the next npx or `fwait' instruction (see npx.c 866 * for why fwait must be trapped at least if there is an npx or an 867 * emulator). This is mainly to handle the case where npx0 is not 868 * configured, since the npx routines normally set up the trap 869 * otherwise. It should be done only at boot time, but doing it 870 * here allows modifying `npx_exists' for testing the emulator on 871 * systems with an npx. 872 */ 873 load_cr0(rcr0() | CR0_MP | CR0_TS); 874 875 #if NNPX > 0 876 /* Initialize the npx (if any) for the current process. */ 877 npxinit(__INITIAL_NPXCW__); 878 #endif 879 880 /* 881 * XXX - Linux emulator 882 * Make sure sure edx is 0x0 on entry. Linux binaries depend 883 * on it. 884 */ 885 p->p_retval[1] = 0; 886 } 887 888 static int 889 sysctl_machdep_adjkerntz SYSCTL_HANDLER_ARGS 890 { 891 int error; 892 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, 893 req); 894 if (!error && req->newptr) 895 resettodr(); 896 return (error); 897 } 898 899 SYSCTL_PROC(_machdep, CPU_ADJKERNTZ, adjkerntz, CTLTYPE_INT|CTLFLAG_RW, 900 &adjkerntz, 0, sysctl_machdep_adjkerntz, "I", ""); 901 902 SYSCTL_INT(_machdep, CPU_DISRTCSET, disable_rtc_set, 903 CTLFLAG_RW, &disable_rtc_set, 0, ""); 904 905 SYSCTL_STRUCT(_machdep, CPU_BOOTINFO, bootinfo, 906 CTLFLAG_RD, &bootinfo, bootinfo, ""); 907 908 SYSCTL_INT(_machdep, CPU_WALLCLOCK, wall_cmos_clock, 909 CTLFLAG_RW, &wall_cmos_clock, 0, ""); 910 911 /* 912 * Initialize 386 and configure to run kernel 913 */ 914 915 /* 916 * Initialize segments & interrupt table 917 */ 918 919 int _default_ldt; 920 #ifdef SMP 921 union descriptor gdt[NGDT + NCPU]; /* global descriptor table */ 922 #else 923 union descriptor gdt[NGDT]; /* global descriptor table */ 924 #endif 925 struct gate_descriptor idt[NIDT]; /* interrupt descriptor table */ 926 union descriptor ldt[NLDT]; /* local descriptor table */ 927 #ifdef SMP 928 /* table descriptors - used to load tables by microp */ 929 struct region_descriptor r_gdt, r_idt; 930 #endif 931 932 extern struct i386tss common_tss; /* One tss per cpu */ 933 #ifdef VM86 934 extern struct segment_descriptor common_tssd; 935 extern int private_tss; /* flag indicating private tss */ 936 extern u_int my_tr; /* which task register setting */ 937 #endif /* VM86 */ 938 939 #if defined(I586_CPU) && !defined(NO_F00F_HACK) 940 struct gate_descriptor *t_idt; 941 extern int has_f00f_bug; 942 #endif 943 944 static struct i386tss dblfault_tss; 945 static char dblfault_stack[PAGE_SIZE]; 946 947 extern struct user *proc0paddr; 948 949 950 /* software prototypes -- in more palatable form */ 951 struct soft_segment_descriptor gdt_segs[ 952 #ifdef SMP 953 NGDT + NCPU 954 #endif 955 ] = { 956 /* GNULL_SEL 0 Null Descriptor */ 957 { 0x0, /* segment base address */ 958 0x0, /* length */ 959 0, /* segment type */ 960 0, /* segment descriptor priority level */ 961 0, /* segment descriptor present */ 962 0, 0, 963 0, /* default 32 vs 16 bit size */ 964 0 /* limit granularity (byte/page units)*/ }, 965 /* GCODE_SEL 1 Code Descriptor for kernel */ 966 { 0x0, /* segment base address */ 967 0xfffff, /* length - all address space */ 968 SDT_MEMERA, /* segment type */ 969 0, /* segment descriptor priority level */ 970 1, /* segment descriptor present */ 971 0, 0, 972 1, /* default 32 vs 16 bit size */ 973 1 /* limit granularity (byte/page units)*/ }, 974 /* GDATA_SEL 2 Data Descriptor for kernel */ 975 { 0x0, /* segment base address */ 976 0xfffff, /* length - all address space */ 977 SDT_MEMRWA, /* segment type */ 978 0, /* segment descriptor priority level */ 979 1, /* segment descriptor present */ 980 0, 0, 981 1, /* default 32 vs 16 bit size */ 982 1 /* limit granularity (byte/page units)*/ }, 983 /* GLDT_SEL 3 LDT Descriptor */ 984 { (int) ldt, /* segment base address */ 985 sizeof(ldt)-1, /* length - all address space */ 986 SDT_SYSLDT, /* segment type */ 987 SEL_UPL, /* segment descriptor priority level */ 988 1, /* segment descriptor present */ 989 0, 0, 990 0, /* unused - default 32 vs 16 bit size */ 991 0 /* limit granularity (byte/page units)*/ }, 992 /* GTGATE_SEL 4 Null Descriptor - Placeholder */ 993 { 0x0, /* segment base address */ 994 0x0, /* length - all address space */ 995 0, /* segment type */ 996 0, /* segment descriptor priority level */ 997 0, /* segment descriptor present */ 998 0, 0, 999 0, /* default 32 vs 16 bit size */ 1000 0 /* limit granularity (byte/page units)*/ }, 1001 /* GPANIC_SEL 5 Panic Tss Descriptor */ 1002 { (int) &dblfault_tss, /* segment base address */ 1003 sizeof(struct i386tss)-1,/* length - all address space */ 1004 SDT_SYS386TSS, /* segment type */ 1005 0, /* segment descriptor priority level */ 1006 1, /* segment descriptor present */ 1007 0, 0, 1008 0, /* unused - default 32 vs 16 bit size */ 1009 0 /* limit granularity (byte/page units)*/ }, 1010 /* GPROC0_SEL 6 Proc 0 Tss Descriptor */ 1011 { 1012 (int) &common_tss, /* segment base address */ 1013 sizeof(struct i386tss)-1,/* length - all address space */ 1014 SDT_SYS386TSS, /* segment type */ 1015 0, /* segment descriptor priority level */ 1016 1, /* segment descriptor present */ 1017 0, 0, 1018 0, /* unused - default 32 vs 16 bit size */ 1019 0 /* limit granularity (byte/page units)*/ }, 1020 /* GUSERLDT_SEL 7 User LDT Descriptor per process */ 1021 { (int) ldt, /* segment base address */ 1022 (512 * sizeof(union descriptor)-1), /* length */ 1023 SDT_SYSLDT, /* segment type */ 1024 0, /* segment descriptor priority level */ 1025 1, /* segment descriptor present */ 1026 0, 0, 1027 0, /* unused - default 32 vs 16 bit size */ 1028 0 /* limit granularity (byte/page units)*/ }, 1029 /* GAPMCODE32_SEL 8 APM BIOS 32-bit interface (32bit Code) */ 1030 { 0, /* segment base address (overwritten by APM) */ 1031 0xffff, /* length (overwritten by APM) */ 1032 SDT_MEMERA, /* segment type */ 1033 0, /* segment descriptor priority level */ 1034 1, /* segment descriptor present */ 1035 0, 0, 1036 1, /* default 32 vs 16 bit size */ 1037 0 /* limit granularity (byte/page units)*/ }, 1038 /* GAPMCODE16_SEL 9 APM BIOS 32-bit interface (16bit Code) */ 1039 { 0, /* segment base address (overwritten by APM) */ 1040 0xffff, /* length (overwritten by APM) */ 1041 SDT_MEMERA, /* segment type */ 1042 0, /* segment descriptor priority level */ 1043 1, /* segment descriptor present */ 1044 0, 0, 1045 0, /* default 32 vs 16 bit size */ 1046 0 /* limit granularity (byte/page units)*/ }, 1047 /* GAPMDATA_SEL 10 APM BIOS 32-bit interface (Data) */ 1048 { 0, /* segment base address (overwritten by APM) */ 1049 0xffff, /* length (overwritten by APM) */ 1050 SDT_MEMRWA, /* segment type */ 1051 0, /* segment descriptor priority level */ 1052 1, /* segment descriptor present */ 1053 0, 0, 1054 0, /* default 32 vs 16 bit size */ 1055 0 /* limit granularity (byte/page units)*/ }, 1056 }; 1057 1058 static struct soft_segment_descriptor ldt_segs[] = { 1059 /* Null Descriptor - overwritten by call gate */ 1060 { 0x0, /* segment base address */ 1061 0x0, /* length - all address space */ 1062 0, /* segment type */ 1063 0, /* segment descriptor priority level */ 1064 0, /* segment descriptor present */ 1065 0, 0, 1066 0, /* default 32 vs 16 bit size */ 1067 0 /* limit granularity (byte/page units)*/ }, 1068 /* Null Descriptor - overwritten by call gate */ 1069 { 0x0, /* segment base address */ 1070 0x0, /* length - all address space */ 1071 0, /* segment type */ 1072 0, /* segment descriptor priority level */ 1073 0, /* segment descriptor present */ 1074 0, 0, 1075 0, /* default 32 vs 16 bit size */ 1076 0 /* limit granularity (byte/page units)*/ }, 1077 /* Null Descriptor - overwritten by call gate */ 1078 { 0x0, /* segment base address */ 1079 0x0, /* length - all address space */ 1080 0, /* segment type */ 1081 0, /* segment descriptor priority level */ 1082 0, /* segment descriptor present */ 1083 0, 0, 1084 0, /* default 32 vs 16 bit size */ 1085 0 /* limit granularity (byte/page units)*/ }, 1086 /* Code Descriptor for user */ 1087 { 0x0, /* segment base address */ 1088 0xfffff, /* length - all address space */ 1089 SDT_MEMERA, /* segment type */ 1090 SEL_UPL, /* segment descriptor priority level */ 1091 1, /* segment descriptor present */ 1092 0, 0, 1093 1, /* default 32 vs 16 bit size */ 1094 1 /* limit granularity (byte/page units)*/ }, 1095 /* Data Descriptor for user */ 1096 { 0x0, /* segment base address */ 1097 0xfffff, /* length - all address space */ 1098 SDT_MEMRWA, /* segment type */ 1099 SEL_UPL, /* segment descriptor priority level */ 1100 1, /* segment descriptor present */ 1101 0, 0, 1102 1, /* default 32 vs 16 bit size */ 1103 1 /* limit granularity (byte/page units)*/ }, 1104 }; 1105 1106 void 1107 setidt(idx, func, typ, dpl, selec) 1108 int idx; 1109 inthand_t *func; 1110 int typ; 1111 int dpl; 1112 int selec; 1113 { 1114 struct gate_descriptor *ip; 1115 1116 #if defined(I586_CPU) && !defined(NO_F00F_HACK) 1117 ip = (t_idt != NULL ? t_idt : idt) + idx; 1118 #else 1119 ip = idt + idx; 1120 #endif 1121 ip->gd_looffset = (int)func; 1122 ip->gd_selector = selec; 1123 ip->gd_stkcpy = 0; 1124 ip->gd_xx = 0; 1125 ip->gd_type = typ; 1126 ip->gd_dpl = dpl; 1127 ip->gd_p = 1; 1128 ip->gd_hioffset = ((int)func)>>16 ; 1129 } 1130 1131 #define IDTVEC(name) __CONCAT(X,name) 1132 1133 extern inthand_t 1134 IDTVEC(div), IDTVEC(dbg), IDTVEC(nmi), IDTVEC(bpt), IDTVEC(ofl), 1135 IDTVEC(bnd), IDTVEC(ill), IDTVEC(dna), IDTVEC(fpusegm), 1136 IDTVEC(tss), IDTVEC(missing), IDTVEC(stk), IDTVEC(prot), 1137 IDTVEC(page), IDTVEC(mchk), IDTVEC(rsvd), IDTVEC(fpu), IDTVEC(align), 1138 IDTVEC(syscall), IDTVEC(int0x80_syscall); 1139 1140 void 1141 sdtossd(sd, ssd) 1142 struct segment_descriptor *sd; 1143 struct soft_segment_descriptor *ssd; 1144 { 1145 ssd->ssd_base = (sd->sd_hibase << 24) | sd->sd_lobase; 1146 ssd->ssd_limit = (sd->sd_hilimit << 16) | sd->sd_lolimit; 1147 ssd->ssd_type = sd->sd_type; 1148 ssd->ssd_dpl = sd->sd_dpl; 1149 ssd->ssd_p = sd->sd_p; 1150 ssd->ssd_def32 = sd->sd_def32; 1151 ssd->ssd_gran = sd->sd_gran; 1152 } 1153 1154 void 1155 init386(first) 1156 int first; 1157 { 1158 int x; 1159 unsigned biosbasemem, biosextmem; 1160 struct gate_descriptor *gdp; 1161 int gsel_tss; 1162 1163 struct isa_device *idp; 1164 #ifndef SMP 1165 /* table descriptors - used to load tables by microp */ 1166 struct region_descriptor r_gdt, r_idt; 1167 #endif 1168 int pagesinbase, pagesinext; 1169 vm_offset_t target_page; 1170 int pa_indx, off; 1171 int speculative_mprobe; 1172 1173 /* 1174 * Prevent lowering of the ipl if we call tsleep() early. 1175 */ 1176 safepri = cpl; 1177 1178 proc0.p_addr = proc0paddr; 1179 1180 atdevbase = ISA_HOLE_START + KERNBASE; 1181 1182 /* 1183 * Initialize the console before we print anything out. 1184 */ 1185 cninit(); 1186 1187 /* 1188 * make gdt memory segments, the code segment goes up to end of the 1189 * page with etext in it, the data segment goes to the end of 1190 * the address space 1191 */ 1192 /* 1193 * XXX text protection is temporarily (?) disabled. The limit was 1194 * i386_btop(round_page(etext)) - 1. 1195 */ 1196 gdt_segs[GCODE_SEL].ssd_limit = i386_btop(0) - 1; 1197 gdt_segs[GDATA_SEL].ssd_limit = i386_btop(0) - 1; 1198 #ifdef BDE_DEBUGGER 1199 #define NGDT1 8 /* avoid overwriting db entries with APM ones */ 1200 #else 1201 #define NGDT1 (sizeof gdt_segs / sizeof gdt_segs[0]) 1202 #endif 1203 for (x = 0; x < NGDT1; x++) 1204 ssdtosd(&gdt_segs[x], &gdt[x].sd); 1205 #ifdef VM86 1206 common_tssd = gdt[GPROC0_SEL].sd; 1207 #endif /* VM86 */ 1208 1209 #ifdef SMP 1210 /* 1211 * Spin these up now. init_secondary() grabs them. We could use 1212 * #for(x,y,z) / #endfor cpp directives if they existed. 1213 */ 1214 for (x = 0; x < NCPU; x++) { 1215 gdt_segs[NGDT + x] = gdt_segs[GPROC0_SEL]; 1216 ssdtosd(&gdt_segs[NGDT + x], &gdt[NGDT + x].sd); 1217 } 1218 #endif 1219 1220 /* make ldt memory segments */ 1221 /* 1222 * The data segment limit must not cover the user area because we 1223 * don't want the user area to be writable in copyout() etc. (page 1224 * level protection is lost in kernel mode on 386's). Also, we 1225 * don't want the user area to be writable directly (page level 1226 * protection of the user area is not available on 486's with 1227 * CR0_WP set, because there is no user-read/kernel-write mode). 1228 * 1229 * XXX - VM_MAXUSER_ADDRESS is an end address, not a max. And it 1230 * should be spelled ...MAX_USER... 1231 */ 1232 #define VM_END_USER_RW_ADDRESS VM_MAXUSER_ADDRESS 1233 /* 1234 * The code segment limit has to cover the user area until we move 1235 * the signal trampoline out of the user area. This is safe because 1236 * the code segment cannot be written to directly. 1237 */ 1238 #define VM_END_USER_R_ADDRESS (VM_END_USER_RW_ADDRESS + UPAGES * PAGE_SIZE) 1239 ldt_segs[LUCODE_SEL].ssd_limit = i386_btop(VM_END_USER_R_ADDRESS) - 1; 1240 ldt_segs[LUDATA_SEL].ssd_limit = i386_btop(VM_END_USER_RW_ADDRESS) - 1; 1241 for (x = 0; x < sizeof ldt_segs / sizeof ldt_segs[0]; x++) 1242 ssdtosd(&ldt_segs[x], &ldt[x].sd); 1243 1244 /* exceptions */ 1245 for (x = 0; x < NIDT; x++) 1246 setidt(x, &IDTVEC(rsvd), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1247 setidt(0, &IDTVEC(div), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1248 setidt(1, &IDTVEC(dbg), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1249 setidt(2, &IDTVEC(nmi), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1250 setidt(3, &IDTVEC(bpt), SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL)); 1251 setidt(4, &IDTVEC(ofl), SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL)); 1252 setidt(5, &IDTVEC(bnd), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1253 setidt(6, &IDTVEC(ill), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1254 setidt(7, &IDTVEC(dna), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1255 setidt(8, 0, SDT_SYSTASKGT, SEL_KPL, GSEL(GPANIC_SEL, SEL_KPL)); 1256 setidt(9, &IDTVEC(fpusegm), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1257 setidt(10, &IDTVEC(tss), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1258 setidt(11, &IDTVEC(missing), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1259 setidt(12, &IDTVEC(stk), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1260 setidt(13, &IDTVEC(prot), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1261 setidt(14, &IDTVEC(page), SDT_SYS386IGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1262 setidt(15, &IDTVEC(rsvd), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1263 setidt(16, &IDTVEC(fpu), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1264 setidt(17, &IDTVEC(align), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1265 setidt(18, &IDTVEC(mchk), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1266 setidt(0x80, &IDTVEC(int0x80_syscall), 1267 SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL)); 1268 1269 #include "isa.h" 1270 #if NISA >0 1271 isa_defaultirq(); 1272 #endif 1273 rand_initialize(); 1274 1275 r_gdt.rd_limit = sizeof(gdt) - 1; 1276 r_gdt.rd_base = (int) gdt; 1277 lgdt(&r_gdt); 1278 1279 r_idt.rd_limit = sizeof(idt) - 1; 1280 r_idt.rd_base = (int) idt; 1281 lidt(&r_idt); 1282 1283 _default_ldt = GSEL(GLDT_SEL, SEL_KPL); 1284 lldt(_default_ldt); 1285 #ifdef USER_LDT 1286 currentldt = _default_ldt; 1287 #endif 1288 1289 #ifdef DDB 1290 kdb_init(); 1291 if (boothowto & RB_KDB) 1292 Debugger("Boot flags requested debugger"); 1293 #endif 1294 1295 finishidentcpu(); /* Final stage of CPU initialization */ 1296 setidt(6, &IDTVEC(ill), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1297 setidt(13, &IDTVEC(prot), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1298 initializecpu(); /* Initialize CPU registers */ 1299 1300 /* make an initial tss so cpu can get interrupt stack on syscall! */ 1301 #ifdef VM86 1302 common_tss.tss_esp0 = (int) proc0.p_addr + UPAGES*PAGE_SIZE - 16; 1303 #else 1304 common_tss.tss_esp0 = (int) proc0.p_addr + UPAGES*PAGE_SIZE; 1305 #endif /* VM86 */ 1306 common_tss.tss_ss0 = GSEL(GDATA_SEL, SEL_KPL) ; 1307 common_tss.tss_ioopt = (sizeof common_tss) << 16; 1308 gsel_tss = GSEL(GPROC0_SEL, SEL_KPL); 1309 ltr(gsel_tss); 1310 #ifdef VM86 1311 private_tss = 0; 1312 my_tr = GPROC0_SEL; 1313 #endif 1314 1315 dblfault_tss.tss_esp = dblfault_tss.tss_esp0 = dblfault_tss.tss_esp1 = 1316 dblfault_tss.tss_esp2 = (int) &dblfault_stack[sizeof(dblfault_stack)]; 1317 dblfault_tss.tss_ss = dblfault_tss.tss_ss0 = dblfault_tss.tss_ss1 = 1318 dblfault_tss.tss_ss2 = GSEL(GDATA_SEL, SEL_KPL); 1319 dblfault_tss.tss_cr3 = (int)IdlePTD; 1320 dblfault_tss.tss_eip = (int) dblfault_handler; 1321 dblfault_tss.tss_eflags = PSL_KERNEL; 1322 dblfault_tss.tss_ds = dblfault_tss.tss_es = dblfault_tss.tss_fs = 1323 dblfault_tss.tss_gs = GSEL(GDATA_SEL, SEL_KPL); 1324 dblfault_tss.tss_cs = GSEL(GCODE_SEL, SEL_KPL); 1325 dblfault_tss.tss_ldt = GSEL(GLDT_SEL, SEL_KPL); 1326 1327 #ifdef VM86 1328 initial_bioscalls(&biosbasemem, &biosextmem); 1329 #else 1330 1331 /* Use BIOS values stored in RTC CMOS RAM, since probing 1332 * breaks certain 386 AT relics. 1333 */ 1334 biosbasemem = rtcin(RTC_BASELO)+ (rtcin(RTC_BASEHI)<<8); 1335 biosextmem = rtcin(RTC_EXTLO)+ (rtcin(RTC_EXTHI)<<8); 1336 #endif 1337 1338 /* 1339 * If BIOS tells us that it has more than 640k in the basemem, 1340 * don't believe it - set it to 640k. 1341 */ 1342 if (biosbasemem > 640) { 1343 printf("Preposterous RTC basemem of %uK, truncating to 640K\n", 1344 biosbasemem); 1345 biosbasemem = 640; 1346 } 1347 if (bootinfo.bi_memsizes_valid && bootinfo.bi_basemem > 640) { 1348 printf("Preposterous BIOS basemem of %uK, truncating to 640K\n", 1349 bootinfo.bi_basemem); 1350 bootinfo.bi_basemem = 640; 1351 } 1352 1353 /* 1354 * Warn if the official BIOS interface disagrees with the RTC 1355 * interface used above about the amount of base memory or the 1356 * amount of extended memory. Prefer the BIOS value for the base 1357 * memory. This is necessary for machines that `steal' base 1358 * memory for use as BIOS memory, at least if we are going to use 1359 * the BIOS for apm. Prefer the RTC value for extended memory. 1360 * Eventually the hackish interface shouldn't even be looked at. 1361 */ 1362 if (bootinfo.bi_memsizes_valid) { 1363 if (bootinfo.bi_basemem != biosbasemem) { 1364 vm_offset_t pa; 1365 1366 printf( 1367 "BIOS basemem (%uK) != RTC basemem (%uK), setting to BIOS value\n", 1368 bootinfo.bi_basemem, biosbasemem); 1369 biosbasemem = bootinfo.bi_basemem; 1370 1371 /* 1372 * XXX if biosbasemem is now < 640, there is `hole' 1373 * between the end of base memory and the start of 1374 * ISA memory. The hole may be empty or it may 1375 * contain BIOS code or data. Map it read/write so 1376 * that the BIOS can write to it. (Memory from 0 to 1377 * the physical end of the kernel is mapped read-only 1378 * to begin with and then parts of it are remapped. 1379 * The parts that aren't remapped form holes that 1380 * remain read-only and are unused by the kernel. 1381 * The base memory area is below the physical end of 1382 * the kernel and right now forms a read-only hole. 1383 * The part of it from PAGE_SIZE to 1384 * (trunc_page(biosbasemem * 1024) - 1) will be 1385 * remapped and used by the kernel later.) 1386 * 1387 * This code is similar to the code used in 1388 * pmap_mapdev, but since no memory needs to be 1389 * allocated we simply change the mapping. 1390 */ 1391 for (pa = trunc_page(biosbasemem * 1024); 1392 pa < ISA_HOLE_START; pa += PAGE_SIZE) { 1393 unsigned *pte; 1394 1395 pte = (unsigned *)vtopte(pa + KERNBASE); 1396 *pte = pa | PG_RW | PG_V; 1397 } 1398 } 1399 if (bootinfo.bi_extmem != biosextmem) 1400 printf("BIOS extmem (%uK) != RTC extmem (%uK)\n", 1401 bootinfo.bi_extmem, biosextmem); 1402 } 1403 1404 #ifdef SMP 1405 /* make hole for AP bootstrap code */ 1406 pagesinbase = mp_bootaddress(biosbasemem) / PAGE_SIZE; 1407 #else 1408 pagesinbase = biosbasemem * 1024 / PAGE_SIZE; 1409 #endif 1410 1411 pagesinext = biosextmem * 1024 / PAGE_SIZE; 1412 1413 /* 1414 * Special hack for chipsets that still remap the 384k hole when 1415 * there's 16MB of memory - this really confuses people that 1416 * are trying to use bus mastering ISA controllers with the 1417 * "16MB limit"; they only have 16MB, but the remapping puts 1418 * them beyond the limit. 1419 */ 1420 /* 1421 * If extended memory is between 15-16MB (16-17MB phys address range), 1422 * chop it to 15MB. 1423 */ 1424 if ((pagesinext > 3840) && (pagesinext < 4096)) 1425 pagesinext = 3840; 1426 1427 /* 1428 * Maxmem isn't the "maximum memory", it's one larger than the 1429 * highest page of the physical address space. It should be 1430 * called something like "Maxphyspage". 1431 */ 1432 Maxmem = pagesinext + 0x100000/PAGE_SIZE; 1433 /* 1434 * Indicate that we wish to do a speculative search for memory beyond 1435 * the end of the reported size if the indicated amount is 64MB (0x4000 1436 * pages) - which is the largest amount that the BIOS/bootblocks can 1437 * currently report. If a specific amount of memory is indicated via 1438 * the MAXMEM option or the npx0 "msize", then don't do the speculative 1439 * memory probe. 1440 */ 1441 if (Maxmem >= 0x4000) 1442 speculative_mprobe = TRUE; 1443 else 1444 speculative_mprobe = FALSE; 1445 1446 #ifdef MAXMEM 1447 Maxmem = MAXMEM/4; 1448 speculative_mprobe = FALSE; 1449 #endif 1450 1451 #if NNPX > 0 1452 idp = find_isadev(isa_devtab_null, &npxdriver, 0); 1453 if (idp != NULL && idp->id_msize != 0) { 1454 Maxmem = idp->id_msize / 4; 1455 speculative_mprobe = FALSE; 1456 } 1457 #endif 1458 1459 #ifdef SMP 1460 /* look for the MP hardware - needed for apic addresses */ 1461 mp_probe(); 1462 #endif 1463 1464 /* call pmap initialization to make new kernel address space */ 1465 pmap_bootstrap (first, 0); 1466 1467 /* 1468 * Size up each available chunk of physical memory. 1469 */ 1470 1471 /* 1472 * We currently don't bother testing base memory. 1473 * XXX ...but we probably should. 1474 */ 1475 pa_indx = 0; 1476 if (pagesinbase > 1) { 1477 phys_avail[pa_indx++] = PAGE_SIZE; /* skip first page of memory */ 1478 phys_avail[pa_indx] = ptoa(pagesinbase);/* memory up to the ISA hole */ 1479 physmem = pagesinbase - 1; 1480 } else { 1481 /* point at first chunk end */ 1482 pa_indx++; 1483 } 1484 1485 for (target_page = avail_start; target_page < ptoa(Maxmem); target_page += PAGE_SIZE) { 1486 int tmp, page_bad; 1487 1488 page_bad = FALSE; 1489 1490 /* 1491 * map page into kernel: valid, read/write, non-cacheable 1492 */ 1493 *(int *)CMAP1 = PG_V | PG_RW | PG_N | target_page; 1494 invltlb(); 1495 1496 tmp = *(int *)CADDR1; 1497 /* 1498 * Test for alternating 1's and 0's 1499 */ 1500 *(volatile int *)CADDR1 = 0xaaaaaaaa; 1501 if (*(volatile int *)CADDR1 != 0xaaaaaaaa) { 1502 page_bad = TRUE; 1503 } 1504 /* 1505 * Test for alternating 0's and 1's 1506 */ 1507 *(volatile int *)CADDR1 = 0x55555555; 1508 if (*(volatile int *)CADDR1 != 0x55555555) { 1509 page_bad = TRUE; 1510 } 1511 /* 1512 * Test for all 1's 1513 */ 1514 *(volatile int *)CADDR1 = 0xffffffff; 1515 if (*(volatile int *)CADDR1 != 0xffffffff) { 1516 page_bad = TRUE; 1517 } 1518 /* 1519 * Test for all 0's 1520 */ 1521 *(volatile int *)CADDR1 = 0x0; 1522 if (*(volatile int *)CADDR1 != 0x0) { 1523 /* 1524 * test of page failed 1525 */ 1526 page_bad = TRUE; 1527 } 1528 /* 1529 * Restore original value. 1530 */ 1531 *(int *)CADDR1 = tmp; 1532 1533 /* 1534 * Adjust array of valid/good pages. 1535 */ 1536 if (page_bad == FALSE) { 1537 /* 1538 * If this good page is a continuation of the 1539 * previous set of good pages, then just increase 1540 * the end pointer. Otherwise start a new chunk. 1541 * Note that "end" points one higher than end, 1542 * making the range >= start and < end. 1543 * If we're also doing a speculative memory 1544 * test and we at or past the end, bump up Maxmem 1545 * so that we keep going. The first bad page 1546 * will terminate the loop. 1547 */ 1548 if (phys_avail[pa_indx] == target_page) { 1549 phys_avail[pa_indx] += PAGE_SIZE; 1550 if (speculative_mprobe == TRUE && 1551 phys_avail[pa_indx] >= (64*1024*1024)) 1552 Maxmem++; 1553 } else { 1554 pa_indx++; 1555 if (pa_indx == PHYS_AVAIL_ARRAY_END) { 1556 printf("Too many holes in the physical address space, giving up\n"); 1557 pa_indx--; 1558 break; 1559 } 1560 phys_avail[pa_indx++] = target_page; /* start */ 1561 phys_avail[pa_indx] = target_page + PAGE_SIZE; /* end */ 1562 } 1563 physmem++; 1564 } 1565 } 1566 1567 *(int *)CMAP1 = 0; 1568 invltlb(); 1569 1570 /* 1571 * XXX 1572 * The last chunk must contain at least one page plus the message 1573 * buffer to avoid complicating other code (message buffer address 1574 * calculation, etc.). 1575 */ 1576 while (phys_avail[pa_indx - 1] + PAGE_SIZE + 1577 round_page(MSGBUF_SIZE) >= phys_avail[pa_indx]) { 1578 physmem -= atop(phys_avail[pa_indx] - phys_avail[pa_indx - 1]); 1579 phys_avail[pa_indx--] = 0; 1580 phys_avail[pa_indx--] = 0; 1581 } 1582 1583 Maxmem = atop(phys_avail[pa_indx]); 1584 1585 /* Trim off space for the message buffer. */ 1586 phys_avail[pa_indx] -= round_page(MSGBUF_SIZE); 1587 1588 avail_end = phys_avail[pa_indx]; 1589 1590 /* now running on new page tables, configured,and u/iom is accessible */ 1591 1592 /* Map the message buffer. */ 1593 for (off = 0; off < round_page(MSGBUF_SIZE); off += PAGE_SIZE) 1594 pmap_enter(kernel_pmap, (vm_offset_t)msgbufp + off, 1595 avail_end + off, VM_PROT_ALL, TRUE); 1596 1597 msgbufinit(msgbufp, MSGBUF_SIZE); 1598 1599 /* make a call gate to reenter kernel with */ 1600 gdp = &ldt[LSYS5CALLS_SEL].gd; 1601 1602 x = (int) &IDTVEC(syscall); 1603 gdp->gd_looffset = x++; 1604 gdp->gd_selector = GSEL(GCODE_SEL,SEL_KPL); 1605 gdp->gd_stkcpy = 1; 1606 gdp->gd_type = SDT_SYS386CGT; 1607 gdp->gd_dpl = SEL_UPL; 1608 gdp->gd_p = 1; 1609 gdp->gd_hioffset = ((int) &IDTVEC(syscall)) >>16; 1610 1611 /* XXX does this work? */ 1612 ldt[LBSDICALLS_SEL] = ldt[LSYS5CALLS_SEL]; 1613 1614 /* transfer to user mode */ 1615 1616 _ucodesel = LSEL(LUCODE_SEL, SEL_UPL); 1617 _udatasel = LSEL(LUDATA_SEL, SEL_UPL); 1618 1619 /* setup proc 0's pcb */ 1620 proc0.p_addr->u_pcb.pcb_flags = 0; 1621 proc0.p_addr->u_pcb.pcb_cr3 = (int)IdlePTD; 1622 #ifdef SMP 1623 proc0.p_addr->u_pcb.pcb_mpnest = 1; 1624 #endif 1625 #ifdef VM86 1626 proc0.p_addr->u_pcb.pcb_ext = 0; 1627 #endif 1628 1629 /* Sigh, relocate physical addresses left from bootstrap */ 1630 if (bootinfo.bi_modulep) { 1631 preload_metadata = (caddr_t)bootinfo.bi_modulep + KERNBASE; 1632 preload_bootstrap_relocate(KERNBASE); 1633 } 1634 if (bootinfo.bi_envp) 1635 kern_envp = (caddr_t)bootinfo.bi_envp + KERNBASE; 1636 } 1637 1638 #if defined(I586_CPU) && !defined(NO_F00F_HACK) 1639 static void f00f_hack(void *unused); 1640 SYSINIT(f00f_hack, SI_SUB_INTRINSIC, SI_ORDER_FIRST, f00f_hack, NULL); 1641 1642 static void 1643 f00f_hack(void *unused) { 1644 #ifndef SMP 1645 struct region_descriptor r_idt; 1646 #endif 1647 vm_offset_t tmp; 1648 1649 if (!has_f00f_bug) 1650 return; 1651 1652 printf("Intel Pentium detected, installing workaround for F00F bug\n"); 1653 1654 r_idt.rd_limit = sizeof(idt) - 1; 1655 1656 tmp = kmem_alloc(kernel_map, PAGE_SIZE * 2); 1657 if (tmp == 0) 1658 panic("kmem_alloc returned 0"); 1659 if (((unsigned int)tmp & (PAGE_SIZE-1)) != 0) 1660 panic("kmem_alloc returned non-page-aligned memory"); 1661 /* Put the first seven entries in the lower page */ 1662 t_idt = (struct gate_descriptor*)(tmp + PAGE_SIZE - (7*8)); 1663 bcopy(idt, t_idt, sizeof(idt)); 1664 r_idt.rd_base = (int)t_idt; 1665 lidt(&r_idt); 1666 if (vm_map_protect(kernel_map, tmp, tmp + PAGE_SIZE, 1667 VM_PROT_READ, FALSE) != KERN_SUCCESS) 1668 panic("vm_map_protect failed"); 1669 return; 1670 } 1671 #endif /* defined(I586_CPU) && !NO_F00F_HACK */ 1672 1673 int 1674 ptrace_set_pc(p, addr) 1675 struct proc *p; 1676 unsigned long addr; 1677 { 1678 p->p_md.md_regs->tf_eip = addr; 1679 return (0); 1680 } 1681 1682 int 1683 ptrace_single_step(p) 1684 struct proc *p; 1685 { 1686 p->p_md.md_regs->tf_eflags |= PSL_T; 1687 return (0); 1688 } 1689 1690 int ptrace_read_u_check(p, addr, len) 1691 struct proc *p; 1692 vm_offset_t addr; 1693 size_t len; 1694 { 1695 vm_offset_t gap; 1696 1697 if ((vm_offset_t) (addr + len) < addr) 1698 return EPERM; 1699 if ((vm_offset_t) (addr + len) <= sizeof(struct user)) 1700 return 0; 1701 1702 gap = (char *) p->p_md.md_regs - (char *) p->p_addr; 1703 1704 if ((vm_offset_t) addr < gap) 1705 return EPERM; 1706 if ((vm_offset_t) (addr + len) <= 1707 (vm_offset_t) (gap + sizeof(struct trapframe))) 1708 return 0; 1709 return EPERM; 1710 } 1711 1712 int ptrace_write_u(p, off, data) 1713 struct proc *p; 1714 vm_offset_t off; 1715 long data; 1716 { 1717 struct trapframe frame_copy; 1718 vm_offset_t min; 1719 struct trapframe *tp; 1720 1721 /* 1722 * Privileged kernel state is scattered all over the user area. 1723 * Only allow write access to parts of regs and to fpregs. 1724 */ 1725 min = (char *)p->p_md.md_regs - (char *)p->p_addr; 1726 if (off >= min && off <= min + sizeof(struct trapframe) - sizeof(int)) { 1727 tp = p->p_md.md_regs; 1728 frame_copy = *tp; 1729 *(int *)((char *)&frame_copy + (off - min)) = data; 1730 if (!EFLAGS_SECURE(frame_copy.tf_eflags, tp->tf_eflags) || 1731 !CS_SECURE(frame_copy.tf_cs)) 1732 return (EINVAL); 1733 *(int*)((char *)p->p_addr + off) = data; 1734 return (0); 1735 } 1736 min = offsetof(struct user, u_pcb) + offsetof(struct pcb, pcb_savefpu); 1737 if (off >= min && off <= min + sizeof(struct save87) - sizeof(int)) { 1738 *(int*)((char *)p->p_addr + off) = data; 1739 return (0); 1740 } 1741 return (EFAULT); 1742 } 1743 1744 int 1745 fill_regs(p, regs) 1746 struct proc *p; 1747 struct reg *regs; 1748 { 1749 struct pcb *pcb; 1750 struct trapframe *tp; 1751 1752 tp = p->p_md.md_regs; 1753 regs->r_es = tp->tf_es; 1754 regs->r_ds = tp->tf_ds; 1755 regs->r_edi = tp->tf_edi; 1756 regs->r_esi = tp->tf_esi; 1757 regs->r_ebp = tp->tf_ebp; 1758 regs->r_ebx = tp->tf_ebx; 1759 regs->r_edx = tp->tf_edx; 1760 regs->r_ecx = tp->tf_ecx; 1761 regs->r_eax = tp->tf_eax; 1762 regs->r_eip = tp->tf_eip; 1763 regs->r_cs = tp->tf_cs; 1764 regs->r_eflags = tp->tf_eflags; 1765 regs->r_esp = tp->tf_esp; 1766 regs->r_ss = tp->tf_ss; 1767 pcb = &p->p_addr->u_pcb; 1768 regs->r_fs = pcb->pcb_fs; 1769 regs->r_gs = pcb->pcb_gs; 1770 return (0); 1771 } 1772 1773 int 1774 set_regs(p, regs) 1775 struct proc *p; 1776 struct reg *regs; 1777 { 1778 struct pcb *pcb; 1779 struct trapframe *tp; 1780 1781 tp = p->p_md.md_regs; 1782 if (!EFLAGS_SECURE(regs->r_eflags, tp->tf_eflags) || 1783 !CS_SECURE(regs->r_cs)) 1784 return (EINVAL); 1785 tp->tf_es = regs->r_es; 1786 tp->tf_ds = regs->r_ds; 1787 tp->tf_edi = regs->r_edi; 1788 tp->tf_esi = regs->r_esi; 1789 tp->tf_ebp = regs->r_ebp; 1790 tp->tf_ebx = regs->r_ebx; 1791 tp->tf_edx = regs->r_edx; 1792 tp->tf_ecx = regs->r_ecx; 1793 tp->tf_eax = regs->r_eax; 1794 tp->tf_eip = regs->r_eip; 1795 tp->tf_cs = regs->r_cs; 1796 tp->tf_eflags = regs->r_eflags; 1797 tp->tf_esp = regs->r_esp; 1798 tp->tf_ss = regs->r_ss; 1799 pcb = &p->p_addr->u_pcb; 1800 pcb->pcb_fs = regs->r_fs; 1801 pcb->pcb_gs = regs->r_gs; 1802 return (0); 1803 } 1804 1805 int 1806 fill_fpregs(p, fpregs) 1807 struct proc *p; 1808 struct fpreg *fpregs; 1809 { 1810 bcopy(&p->p_addr->u_pcb.pcb_savefpu, fpregs, sizeof *fpregs); 1811 return (0); 1812 } 1813 1814 int 1815 set_fpregs(p, fpregs) 1816 struct proc *p; 1817 struct fpreg *fpregs; 1818 { 1819 bcopy(fpregs, &p->p_addr->u_pcb.pcb_savefpu, sizeof *fpregs); 1820 return (0); 1821 } 1822 1823 #ifndef DDB 1824 void 1825 Debugger(const char *msg) 1826 { 1827 printf("Debugger(\"%s\") called.\n", msg); 1828 } 1829 #endif /* no DDB */ 1830 1831 #include <sys/disklabel.h> 1832 1833 /* 1834 * Determine the size of the transfer, and make sure it is 1835 * within the boundaries of the partition. Adjust transfer 1836 * if needed, and signal errors or early completion. 1837 */ 1838 int 1839 bounds_check_with_label(struct buf *bp, struct disklabel *lp, int wlabel) 1840 { 1841 struct partition *p = lp->d_partitions + dkpart(bp->b_dev); 1842 int labelsect = lp->d_partitions[0].p_offset; 1843 int maxsz = p->p_size, 1844 sz = (bp->b_bcount + DEV_BSIZE - 1) >> DEV_BSHIFT; 1845 1846 /* overwriting disk label ? */ 1847 /* XXX should also protect bootstrap in first 8K */ 1848 if (bp->b_blkno + p->p_offset <= LABELSECTOR + labelsect && 1849 #if LABELSECTOR != 0 1850 bp->b_blkno + p->p_offset + sz > LABELSECTOR + labelsect && 1851 #endif 1852 (bp->b_flags & B_READ) == 0 && wlabel == 0) { 1853 bp->b_error = EROFS; 1854 goto bad; 1855 } 1856 1857 #if defined(DOSBBSECTOR) && defined(notyet) 1858 /* overwriting master boot record? */ 1859 if (bp->b_blkno + p->p_offset <= DOSBBSECTOR && 1860 (bp->b_flags & B_READ) == 0 && wlabel == 0) { 1861 bp->b_error = EROFS; 1862 goto bad; 1863 } 1864 #endif 1865 1866 /* beyond partition? */ 1867 if (bp->b_blkno < 0 || bp->b_blkno + sz > maxsz) { 1868 /* if exactly at end of disk, return an EOF */ 1869 if (bp->b_blkno == maxsz) { 1870 bp->b_resid = bp->b_bcount; 1871 return(0); 1872 } 1873 /* or truncate if part of it fits */ 1874 sz = maxsz - bp->b_blkno; 1875 if (sz <= 0) { 1876 bp->b_error = EINVAL; 1877 goto bad; 1878 } 1879 bp->b_bcount = sz << DEV_BSHIFT; 1880 } 1881 1882 bp->b_pblkno = bp->b_blkno + p->p_offset; 1883 return(1); 1884 1885 bad: 1886 bp->b_flags |= B_ERROR; 1887 return(-1); 1888 } 1889 1890 #ifdef DDB 1891 1892 /* 1893 * Provide inb() and outb() as functions. They are normally only 1894 * available as macros calling inlined functions, thus cannot be 1895 * called inside DDB. 1896 * 1897 * The actual code is stolen from <machine/cpufunc.h>, and de-inlined. 1898 */ 1899 1900 #undef inb 1901 #undef outb 1902 1903 /* silence compiler warnings */ 1904 u_char inb(u_int); 1905 void outb(u_int, u_char); 1906 1907 u_char 1908 inb(u_int port) 1909 { 1910 u_char data; 1911 /* 1912 * We use %%dx and not %1 here because i/o is done at %dx and not at 1913 * %edx, while gcc generates inferior code (movw instead of movl) 1914 * if we tell it to load (u_short) port. 1915 */ 1916 __asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port)); 1917 return (data); 1918 } 1919 1920 void 1921 outb(u_int port, u_char data) 1922 { 1923 u_char al; 1924 /* 1925 * Use an unnecessary assignment to help gcc's register allocator. 1926 * This make a large difference for gcc-1.40 and a tiny difference 1927 * for gcc-2.6.0. For gcc-1.40, al had to be ``asm("ax")'' for 1928 * best results. gcc-2.6.0 can't handle this. 1929 */ 1930 al = data; 1931 __asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port)); 1932 } 1933 1934 #endif /* DDB */
Cache object: 50d9453e2ff52ceddf09e182334132b0
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