machdep.c revision 76298
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: head/sys/amd64/amd64/machdep.c 76298 2001-05-06 02:13:12Z deischen $ 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_npx.h" 51#include "opt_perfmon.h" 52#include "opt_userconfig.h" 53 54#include <sys/param.h> 55#include <sys/systm.h> 56#include <sys/sysproto.h> 57#include <sys/signalvar.h> 58#include <sys/ipl.h> 59#include <sys/kernel.h> 60#include <sys/ktr.h> 61#include <sys/linker.h> 62#include <sys/lock.h> 63#include <sys/malloc.h> 64#include <sys/mutex.h> 65#include <sys/proc.h> 66#include <sys/bio.h> 67#include <sys/buf.h> 68#include <sys/reboot.h> 69#include <sys/smp.h> 70#include <sys/callout.h> 71#include <sys/msgbuf.h> 72#include <sys/sysent.h> 73#include <sys/sysctl.h> 74#include <sys/vmmeter.h> 75#include <sys/bus.h> 76#include <sys/eventhandler.h> 77 78#include <vm/vm.h> 79#include <vm/vm_param.h> 80#include <sys/lock.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/bootinfo.h> 102#include <machine/md_var.h> 103#include <machine/pc/bios.h> 104#include <machine/pcb_ext.h> /* pcb.h included via sys/user.h */ 105#include <machine/globaldata.h> 106#include <machine/globals.h> 107#include <machine/intrcnt.h> 108#ifdef PERFMON 109#include <machine/perfmon.h> 110#endif 111 112#ifdef OLD_BUS_ARCH 113#include <i386/isa/isa_device.h> 114#endif 115#include <i386/isa/icu.h> 116#include <i386/isa/intr_machdep.h> 117#include <isa/rtc.h> 118#include <machine/vm86.h> 119#include <sys/ptrace.h> 120#include <machine/sigframe.h> 121 122extern void init386 __P((int first)); 123extern void dblfault_handler __P((void)); 124 125extern void printcpuinfo(void); /* XXX header file */ 126extern void earlysetcpuclass(void); /* same header file */ 127extern void finishidentcpu(void); 128extern void panicifcpuunsupported(void); 129extern void initializecpu(void); 130 131#define CS_SECURE(cs) (ISPL(cs) == SEL_UPL) 132#define EFL_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) 133 134static void cpu_startup __P((void *)); 135SYSINIT(cpu, SI_SUB_CPU, SI_ORDER_FIRST, cpu_startup, NULL) 136 137int _udatasel, _ucodesel; 138u_int atdevbase; 139 140#if defined(SWTCH_OPTIM_STATS) 141extern int swtch_optim_stats; 142SYSCTL_INT(_debug, OID_AUTO, swtch_optim_stats, 143 CTLFLAG_RD, &swtch_optim_stats, 0, ""); 144SYSCTL_INT(_debug, OID_AUTO, tlb_flush_count, 145 CTLFLAG_RD, &tlb_flush_count, 0, ""); 146#endif 147 148#ifdef PC98 149static int ispc98 = 1; 150#else 151static int ispc98 = 0; 152#endif 153SYSCTL_INT(_machdep, OID_AUTO, ispc98, CTLFLAG_RD, &ispc98, 0, ""); 154 155int physmem = 0; 156int cold = 1; 157 158static void osendsig __P((sig_t catcher, int sig, sigset_t *mask, u_long code)); 159 160static int 161sysctl_hw_physmem(SYSCTL_HANDLER_ARGS) 162{ 163 int error = sysctl_handle_int(oidp, 0, ctob(physmem), req); 164 return (error); 165} 166 167SYSCTL_PROC(_hw, HW_PHYSMEM, physmem, CTLTYPE_INT|CTLFLAG_RD, 168 0, 0, sysctl_hw_physmem, "I", ""); 169 170static int 171sysctl_hw_usermem(SYSCTL_HANDLER_ARGS) 172{ 173 int error = sysctl_handle_int(oidp, 0, 174 ctob(physmem - cnt.v_wire_count), req); 175 return (error); 176} 177 178SYSCTL_PROC(_hw, HW_USERMEM, usermem, CTLTYPE_INT|CTLFLAG_RD, 179 0, 0, sysctl_hw_usermem, "I", ""); 180 181static int 182sysctl_hw_availpages(SYSCTL_HANDLER_ARGS) 183{ 184 int error = sysctl_handle_int(oidp, 0, 185 i386_btop(avail_end - avail_start), req); 186 return (error); 187} 188 189SYSCTL_PROC(_hw, OID_AUTO, availpages, CTLTYPE_INT|CTLFLAG_RD, 190 0, 0, sysctl_hw_availpages, "I", ""); 191 192static int 193sysctl_machdep_msgbuf(SYSCTL_HANDLER_ARGS) 194{ 195 int error; 196 197 /* Unwind the buffer, so that it's linear (possibly starting with 198 * some initial nulls). 199 */ 200 error=sysctl_handle_opaque(oidp,msgbufp->msg_ptr+msgbufp->msg_bufr, 201 msgbufp->msg_size-msgbufp->msg_bufr,req); 202 if(error) return(error); 203 if(msgbufp->msg_bufr>0) { 204 error=sysctl_handle_opaque(oidp,msgbufp->msg_ptr, 205 msgbufp->msg_bufr,req); 206 } 207 return(error); 208} 209 210SYSCTL_PROC(_machdep, OID_AUTO, msgbuf, CTLTYPE_STRING|CTLFLAG_RD, 211 0, 0, sysctl_machdep_msgbuf, "A","Contents of kernel message buffer"); 212 213static int msgbuf_clear; 214 215static int 216sysctl_machdep_msgbuf_clear(SYSCTL_HANDLER_ARGS) 217{ 218 int error; 219 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, 220 req); 221 if (!error && req->newptr) { 222 /* Clear the buffer and reset write pointer */ 223 bzero(msgbufp->msg_ptr,msgbufp->msg_size); 224 msgbufp->msg_bufr=msgbufp->msg_bufx=0; 225 msgbuf_clear=0; 226 } 227 return (error); 228} 229 230SYSCTL_PROC(_machdep, OID_AUTO, msgbuf_clear, CTLTYPE_INT|CTLFLAG_RW, 231 &msgbuf_clear, 0, sysctl_machdep_msgbuf_clear, "I", 232 "Clear kernel message buffer"); 233 234int bootverbose = 0, Maxmem = 0; 235long dumplo; 236 237vm_offset_t phys_avail[10]; 238 239/* must be 2 less so 0 0 can signal end of chunks */ 240#define PHYS_AVAIL_ARRAY_END ((sizeof(phys_avail) / sizeof(vm_offset_t)) - 2) 241 242static vm_offset_t buffer_sva, buffer_eva; 243vm_offset_t clean_sva, clean_eva; 244static vm_offset_t pager_sva, pager_eva; 245static struct trapframe proc0_tf; 246#ifndef SMP 247static struct globaldata __globaldata; 248#endif 249 250struct mtx sched_lock; 251struct mtx Giant; 252 253static void 254cpu_startup(dummy) 255 void *dummy; 256{ 257 register unsigned i; 258 register caddr_t v; 259 vm_offset_t maxaddr; 260 vm_size_t size = 0; 261 int firstaddr; 262 vm_offset_t minaddr; 263 int physmem_est; 264 265 if (boothowto & RB_VERBOSE) 266 bootverbose++; 267 268 /* 269 * Good {morning,afternoon,evening,night}. 270 */ 271 printf("%s", version); 272 earlysetcpuclass(); 273 startrtclock(); 274 printcpuinfo(); 275 panicifcpuunsupported(); 276#ifdef PERFMON 277 perfmon_init(); 278#endif 279 printf("real memory = %u (%uK bytes)\n", ptoa(Maxmem), ptoa(Maxmem) / 1024); 280 /* 281 * Display any holes after the first chunk of extended memory. 282 */ 283 if (bootverbose) { 284 int indx; 285 286 printf("Physical memory chunk(s):\n"); 287 for (indx = 0; phys_avail[indx + 1] != 0; indx += 2) { 288 unsigned int size1 = phys_avail[indx + 1] - phys_avail[indx]; 289 290 printf("0x%08x - 0x%08x, %u bytes (%u pages)\n", 291 phys_avail[indx], phys_avail[indx + 1] - 1, size1, 292 size1 / PAGE_SIZE); 293 } 294 } 295 296 /* 297 * Calculate callout wheel size 298 */ 299 for (callwheelsize = 1, callwheelbits = 0; 300 callwheelsize < ncallout; 301 callwheelsize <<= 1, ++callwheelbits) 302 ; 303 callwheelmask = callwheelsize - 1; 304 305 /* 306 * Allocate space for system data structures. 307 * The first available kernel virtual address is in "v". 308 * As pages of kernel virtual memory are allocated, "v" is incremented. 309 * As pages of memory are allocated and cleared, 310 * "firstaddr" is incremented. 311 * An index into the kernel page table corresponding to the 312 * virtual memory address maintained in "v" is kept in "mapaddr". 313 */ 314 315 /* 316 * Make two passes. The first pass calculates how much memory is 317 * needed and allocates it. The second pass assigns virtual 318 * addresses to the various data structures. 319 */ 320 firstaddr = 0; 321again: 322 v = (caddr_t)firstaddr; 323 324#define valloc(name, type, num) \ 325 (name) = (type *)v; v = (caddr_t)((name)+(num)) 326#define valloclim(name, type, num, lim) \ 327 (name) = (type *)v; v = (caddr_t)((lim) = ((name)+(num))) 328 329 valloc(callout, struct callout, ncallout); 330 valloc(callwheel, struct callout_tailq, callwheelsize); 331 332 /* 333 * Discount the physical memory larger than the size of kernel_map 334 * to avoid eating up all of KVA space. 335 */ 336 if (kernel_map->first_free == NULL) { 337 printf("Warning: no free entries in kernel_map.\n"); 338 physmem_est = physmem; 339 } else 340 physmem_est = min(physmem, kernel_map->max_offset - kernel_map->min_offset); 341 342 /* 343 * The nominal buffer size (and minimum KVA allocation) is BKVASIZE. 344 * For the first 64MB of ram nominally allocate sufficient buffers to 345 * cover 1/4 of our ram. Beyond the first 64MB allocate additional 346 * buffers to cover 1/20 of our ram over 64MB. 347 * 348 * factor represents the 1/4 x ram conversion. 349 */ 350 if (nbuf == 0) { 351 int factor = 4 * BKVASIZE / PAGE_SIZE; 352 353 nbuf = 50; 354 if (physmem_est > 1024) 355 nbuf += min((physmem_est - 1024) / factor, 16384 / factor); 356 if (physmem_est > 16384) 357 nbuf += (physmem_est - 16384) * 2 / (factor * 5); 358 } 359 360 /* 361 * Do not allow the buffer_map to be more then 1/2 the size of the 362 * kernel_map. 363 */ 364 if (nbuf > (kernel_map->max_offset - kernel_map->min_offset) / 365 (BKVASIZE * 2)) { 366 nbuf = (kernel_map->max_offset - kernel_map->min_offset) / 367 (BKVASIZE * 2); 368 printf("Warning: nbufs capped at %d\n", nbuf); 369 } 370 371 nswbuf = max(min(nbuf/4, 256), 16); 372 373 valloc(swbuf, struct buf, nswbuf); 374 valloc(buf, struct buf, nbuf); 375 v = bufhashinit(v); 376 377 /* 378 * End of first pass, size has been calculated so allocate memory 379 */ 380 if (firstaddr == 0) { 381 size = (vm_size_t)(v - firstaddr); 382 firstaddr = (int)kmem_alloc(kernel_map, round_page(size)); 383 if (firstaddr == 0) 384 panic("startup: no room for tables"); 385 goto again; 386 } 387 388 /* 389 * End of second pass, addresses have been assigned 390 */ 391 if ((vm_size_t)(v - firstaddr) != size) 392 panic("startup: table size inconsistency"); 393 394 clean_map = kmem_suballoc(kernel_map, &clean_sva, &clean_eva, 395 (nbuf*BKVASIZE) + (nswbuf*MAXPHYS) + pager_map_size); 396 buffer_map = kmem_suballoc(clean_map, &buffer_sva, &buffer_eva, 397 (nbuf*BKVASIZE)); 398 buffer_map->system_map = 1; 399 pager_map = kmem_suballoc(clean_map, &pager_sva, &pager_eva, 400 (nswbuf*MAXPHYS) + pager_map_size); 401 pager_map->system_map = 1; 402 exec_map = kmem_suballoc(kernel_map, &minaddr, &maxaddr, 403 (16*(ARG_MAX+(PAGE_SIZE*3)))); 404 405 /* 406 * XXX: Mbuf system machine-specific initializations should 407 * go here, if anywhere. 408 */ 409 410 /* 411 * Initialize callouts 412 */ 413 SLIST_INIT(&callfree); 414 for (i = 0; i < ncallout; i++) { 415 callout_init(&callout[i], 0); 416 callout[i].c_flags = CALLOUT_LOCAL_ALLOC; 417 SLIST_INSERT_HEAD(&callfree, &callout[i], c_links.sle); 418 } 419 420 for (i = 0; i < callwheelsize; i++) { 421 TAILQ_INIT(&callwheel[i]); 422 } 423 424 mtx_init(&callout_lock, "callout", MTX_SPIN | MTX_RECURSE); 425 426#if defined(USERCONFIG) 427 userconfig(); 428 cninit(); /* the preferred console may have changed */ 429#endif 430 431 printf("avail memory = %u (%uK bytes)\n", ptoa(cnt.v_free_count), 432 ptoa(cnt.v_free_count) / 1024); 433 434 /* 435 * Set up buffers, so they can be used to read disk labels. 436 */ 437 bufinit(); 438 vm_pager_bufferinit(); 439 440#ifdef SMP 441 globaldata_register(GLOBALDATA); 442#else 443 /* For SMP, we delay the cpu_setregs() until after SMP startup. */ 444 cpu_setregs(); 445#endif 446} 447 448/* 449 * Send an interrupt to process. 450 * 451 * Stack is set up to allow sigcode stored 452 * at top to call routine, followed by kcall 453 * to sigreturn routine below. After sigreturn 454 * resets the signal mask, the stack, and the 455 * frame pointer, it returns to the user 456 * specified pc, psl. 457 */ 458static void 459osendsig(catcher, sig, mask, code) 460 sig_t catcher; 461 int sig; 462 sigset_t *mask; 463 u_long code; 464{ 465 struct osigframe sf; 466 struct osigframe *fp; 467 struct proc *p; 468 struct sigacts *psp; 469 struct trapframe *regs; 470 int oonstack; 471 472 p = curproc; 473 PROC_LOCK(p); 474 psp = p->p_sigacts; 475 regs = p->p_md.md_regs; 476 oonstack = sigonstack(regs->tf_esp); 477 478 /* Allocate and validate space for the signal handler context. */ 479 if ((p->p_flag & P_ALTSTACK) && !oonstack && 480 SIGISMEMBER(psp->ps_sigonstack, sig)) { 481 fp = (struct osigframe *)(p->p_sigstk.ss_sp + 482 p->p_sigstk.ss_size - sizeof(struct osigframe)); 483#if defined(COMPAT_43) || defined(COMPAT_SUNOS) 484 p->p_sigstk.ss_flags |= SS_ONSTACK; 485#endif 486 } else 487 fp = (struct osigframe *)regs->tf_esp - 1; 488 PROC_UNLOCK(p); 489 490 /* 491 * grow_stack() will return 0 if *fp does not fit inside the stack 492 * and the stack can not be grown. 493 * useracc() will return FALSE if access is denied. 494 */ 495 if (grow_stack(p, (int)fp) == 0 || 496 !useracc((caddr_t)fp, sizeof(*fp), VM_PROT_WRITE)) { 497 /* 498 * Process has trashed its stack; give it an illegal 499 * instruction to halt it in its tracks. 500 */ 501 PROC_LOCK(p); 502 SIGACTION(p, SIGILL) = SIG_DFL; 503 SIGDELSET(p->p_sigignore, SIGILL); 504 SIGDELSET(p->p_sigcatch, SIGILL); 505 SIGDELSET(p->p_sigmask, SIGILL); 506 psignal(p, SIGILL); 507 PROC_UNLOCK(p); 508 return; 509 } 510 511 /* Translate the signal if appropriate. */ 512 if (p->p_sysent->sv_sigtbl && sig <= p->p_sysent->sv_sigsize) 513 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)]; 514 515 /* Build the argument list for the signal handler. */ 516 sf.sf_signum = sig; 517 sf.sf_scp = (register_t)&fp->sf_siginfo.si_sc; 518 PROC_LOCK(p); 519 if (SIGISMEMBER(p->p_sigacts->ps_siginfo, sig)) { 520 /* Signal handler installed with SA_SIGINFO. */ 521 sf.sf_arg2 = (register_t)&fp->sf_siginfo; 522 sf.sf_siginfo.si_signo = sig; 523 sf.sf_siginfo.si_code = code; 524 sf.sf_ahu.sf_action = (__osiginfohandler_t *)catcher; 525 } else { 526 /* Old FreeBSD-style arguments. */ 527 sf.sf_arg2 = code; 528 sf.sf_addr = regs->tf_err; 529 sf.sf_ahu.sf_handler = catcher; 530 } 531 PROC_UNLOCK(p); 532 533 /* Save most if not all of trap frame. */ 534 sf.sf_siginfo.si_sc.sc_eax = regs->tf_eax; 535 sf.sf_siginfo.si_sc.sc_ebx = regs->tf_ebx; 536 sf.sf_siginfo.si_sc.sc_ecx = regs->tf_ecx; 537 sf.sf_siginfo.si_sc.sc_edx = regs->tf_edx; 538 sf.sf_siginfo.si_sc.sc_esi = regs->tf_esi; 539 sf.sf_siginfo.si_sc.sc_edi = regs->tf_edi; 540 sf.sf_siginfo.si_sc.sc_cs = regs->tf_cs; 541 sf.sf_siginfo.si_sc.sc_ds = regs->tf_ds; 542 sf.sf_siginfo.si_sc.sc_ss = regs->tf_ss; 543 sf.sf_siginfo.si_sc.sc_es = regs->tf_es; 544 sf.sf_siginfo.si_sc.sc_fs = regs->tf_fs; 545 sf.sf_siginfo.si_sc.sc_gs = rgs(); 546 sf.sf_siginfo.si_sc.sc_isp = regs->tf_isp; 547 548 /* Build the signal context to be used by osigreturn(). */ 549 sf.sf_siginfo.si_sc.sc_onstack = (oonstack) ? 1 : 0; 550 SIG2OSIG(*mask, sf.sf_siginfo.si_sc.sc_mask); 551 sf.sf_siginfo.si_sc.sc_sp = regs->tf_esp; 552 sf.sf_siginfo.si_sc.sc_fp = regs->tf_ebp; 553 sf.sf_siginfo.si_sc.sc_pc = regs->tf_eip; 554 sf.sf_siginfo.si_sc.sc_ps = regs->tf_eflags; 555 sf.sf_siginfo.si_sc.sc_trapno = regs->tf_trapno; 556 sf.sf_siginfo.si_sc.sc_err = regs->tf_err; 557 558 /* 559 * If we're a vm86 process, we want to save the segment registers. 560 * We also change eflags to be our emulated eflags, not the actual 561 * eflags. 562 */ 563 if (regs->tf_eflags & PSL_VM) { 564 /* XXX confusing names: `tf' isn't a trapframe; `regs' is. */ 565 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs; 566 struct vm86_kernel *vm86 = &p->p_addr->u_pcb.pcb_ext->ext_vm86; 567 568 sf.sf_siginfo.si_sc.sc_gs = tf->tf_vm86_gs; 569 sf.sf_siginfo.si_sc.sc_fs = tf->tf_vm86_fs; 570 sf.sf_siginfo.si_sc.sc_es = tf->tf_vm86_es; 571 sf.sf_siginfo.si_sc.sc_ds = tf->tf_vm86_ds; 572 573 if (vm86->vm86_has_vme == 0) 574 sf.sf_siginfo.si_sc.sc_ps = 575 (tf->tf_eflags & ~(PSL_VIF | PSL_VIP)) | 576 (vm86->vm86_eflags & (PSL_VIF | PSL_VIP)); 577 578 /* See sendsig() for comments. */ 579 tf->tf_eflags &= ~(PSL_VM | PSL_NT | PSL_T | PSL_VIF | PSL_VIP); 580 } 581 582 /* Copy the sigframe out to the user's stack. */ 583 if (copyout(&sf, fp, sizeof(*fp)) != 0) { 584 /* 585 * Something is wrong with the stack pointer. 586 * ...Kill the process. 587 */ 588 PROC_LOCK(p); 589 sigexit(p, SIGILL); 590 /* NOTREACHED */ 591 } 592 593 regs->tf_esp = (int)fp; 594 regs->tf_eip = PS_STRINGS - szosigcode; 595 regs->tf_cs = _ucodesel; 596 regs->tf_ds = _udatasel; 597 regs->tf_es = _udatasel; 598 regs->tf_fs = _udatasel; 599 load_gs(_udatasel); 600 regs->tf_ss = _udatasel; 601} 602 603void 604sendsig(catcher, sig, mask, code) 605 sig_t catcher; 606 int sig; 607 sigset_t *mask; 608 u_long code; 609{ 610 struct sigframe sf; 611 struct proc *p; 612 struct sigacts *psp; 613 struct trapframe *regs; 614 struct sigframe *sfp; 615 int oonstack; 616 617 p = curproc; 618 PROC_LOCK(p); 619 psp = p->p_sigacts; 620 if (SIGISMEMBER(psp->ps_osigset, sig)) { 621 PROC_UNLOCK(p); 622 osendsig(catcher, sig, mask, code); 623 return; 624 } 625 regs = p->p_md.md_regs; 626 oonstack = sigonstack(regs->tf_esp); 627 628 /* Save user context. */ 629 bzero(&sf, sizeof(sf)); 630 sf.sf_uc.uc_sigmask = *mask; 631 sf.sf_uc.uc_stack = p->p_sigstk; 632 sf.sf_uc.uc_stack.ss_flags = (p->p_flag & P_ALTSTACK) 633 ? ((oonstack) ? SS_ONSTACK : 0) : SS_DISABLE; 634 sf.sf_uc.uc_mcontext.mc_onstack = (oonstack) ? 1 : 0; 635 sf.sf_uc.uc_mcontext.mc_gs = rgs(); 636 bcopy(regs, &sf.sf_uc.uc_mcontext.mc_fs, sizeof(*regs)); 637 638 /* Allocate and validate space for the signal handler context. */ 639 if ((p->p_flag & P_ALTSTACK) != 0 && !oonstack && 640 SIGISMEMBER(psp->ps_sigonstack, sig)) { 641 sfp = (struct sigframe *)(p->p_sigstk.ss_sp + 642 p->p_sigstk.ss_size - sizeof(struct sigframe)); 643#if defined(COMPAT_43) || defined(COMPAT_SUNOS) 644 p->p_sigstk.ss_flags |= SS_ONSTACK; 645#endif 646 } else 647 sfp = (struct sigframe *)regs->tf_esp - 1; 648 PROC_UNLOCK(p); 649 650 /* 651 * grow_stack() will return 0 if *sfp does not fit inside the stack 652 * and the stack can not be grown. 653 * useracc() will return FALSE if access is denied. 654 */ 655 if (grow_stack(p, (int)sfp) == 0 || 656 !useracc((caddr_t)sfp, sizeof(*sfp), VM_PROT_WRITE)) { 657 /* 658 * Process has trashed its stack; give it an illegal 659 * instruction to halt it in its tracks. 660 */ 661#ifdef DEBUG 662 printf("process %d has trashed its stack\n", p->p_pid); 663#endif 664 PROC_LOCK(p); 665 SIGACTION(p, SIGILL) = SIG_DFL; 666 SIGDELSET(p->p_sigignore, SIGILL); 667 SIGDELSET(p->p_sigcatch, SIGILL); 668 SIGDELSET(p->p_sigmask, SIGILL); 669 psignal(p, SIGILL); 670 PROC_UNLOCK(p); 671 return; 672 } 673 674 /* Translate the signal if appropriate. */ 675 if (p->p_sysent->sv_sigtbl && sig <= p->p_sysent->sv_sigsize) 676 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)]; 677 678 /* Build the argument list for the signal handler. */ 679 sf.sf_signum = sig; 680 sf.sf_ucontext = (register_t)&sfp->sf_uc; 681 PROC_LOCK(p); 682 if (SIGISMEMBER(p->p_sigacts->ps_siginfo, sig)) { 683 /* Signal handler installed with SA_SIGINFO. */ 684 sf.sf_siginfo = (register_t)&sfp->sf_si; 685 sf.sf_ahu.sf_action = (__siginfohandler_t *)catcher; 686 687 /* Fill siginfo structure. */ 688 sf.sf_si.si_signo = sig; 689 sf.sf_si.si_code = code; 690 sf.sf_si.si_addr = (void *)regs->tf_err; 691 } else { 692 /* Old FreeBSD-style arguments. */ 693 sf.sf_siginfo = code; 694 sf.sf_addr = regs->tf_err; 695 sf.sf_ahu.sf_handler = catcher; 696 } 697 PROC_UNLOCK(p); 698 699 /* 700 * If we're a vm86 process, we want to save the segment registers. 701 * We also change eflags to be our emulated eflags, not the actual 702 * eflags. 703 */ 704 if (regs->tf_eflags & PSL_VM) { 705 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs; 706 struct vm86_kernel *vm86 = &p->p_addr->u_pcb.pcb_ext->ext_vm86; 707 708 sf.sf_uc.uc_mcontext.mc_gs = tf->tf_vm86_gs; 709 sf.sf_uc.uc_mcontext.mc_fs = tf->tf_vm86_fs; 710 sf.sf_uc.uc_mcontext.mc_es = tf->tf_vm86_es; 711 sf.sf_uc.uc_mcontext.mc_ds = tf->tf_vm86_ds; 712 713 if (vm86->vm86_has_vme == 0) 714 sf.sf_uc.uc_mcontext.mc_eflags = 715 (tf->tf_eflags & ~(PSL_VIF | PSL_VIP)) | 716 (vm86->vm86_eflags & (PSL_VIF | PSL_VIP)); 717 718 /* 719 * We should never have PSL_T set when returning from vm86 720 * mode. It may be set here if we deliver a signal before 721 * getting to vm86 mode, so turn it off. 722 * 723 * Clear PSL_NT to inhibit T_TSSFLT faults on return from 724 * syscalls made by the signal handler. This just avoids 725 * wasting time for our lazy fixup of such faults. PSL_NT 726 * does nothing in vm86 mode, but vm86 programs can set it 727 * almost legitimately in probes for old cpu types. 728 */ 729 tf->tf_eflags &= ~(PSL_VM | PSL_NT | PSL_T | PSL_VIF | PSL_VIP); 730 } 731 732 /* Copy the sigframe out to the user's stack. */ 733 if (copyout(&sf, sfp, sizeof(*sfp)) != 0) { 734 /* 735 * Something is wrong with the stack pointer. 736 * ...Kill the process. 737 */ 738 PROC_LOCK(p); 739 sigexit(p, SIGILL); 740 /* NOTREACHED */ 741 } 742 743 regs->tf_esp = (int)sfp; 744 regs->tf_eip = PS_STRINGS - *(p->p_sysent->sv_szsigcode); 745 regs->tf_cs = _ucodesel; 746 regs->tf_ds = _udatasel; 747 regs->tf_es = _udatasel; 748 regs->tf_ss = _udatasel; 749} 750 751/* 752 * System call to cleanup state after a signal 753 * has been taken. Reset signal mask and 754 * stack state from context left by sendsig (above). 755 * Return to previous pc and psl as specified by 756 * context left by sendsig. Check carefully to 757 * make sure that the user has not modified the 758 * state to gain improper privileges. 759 */ 760int 761osigreturn(p, uap) 762 struct proc *p; 763 struct osigreturn_args /* { 764 struct osigcontext *sigcntxp; 765 } */ *uap; 766{ 767 struct trapframe *regs; 768 struct osigcontext *scp; 769 int eflags; 770 771 regs = p->p_md.md_regs; 772 scp = uap->sigcntxp; 773 if (!useracc((caddr_t)scp, sizeof(*scp), VM_PROT_READ)) 774 return (EFAULT); 775 eflags = scp->sc_ps; 776 if (eflags & PSL_VM) { 777 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs; 778 struct vm86_kernel *vm86; 779 780 /* 781 * if pcb_ext == 0 or vm86_inited == 0, the user hasn't 782 * set up the vm86 area, and we can't enter vm86 mode. 783 */ 784 if (p->p_addr->u_pcb.pcb_ext == 0) 785 return (EINVAL); 786 vm86 = &p->p_addr->u_pcb.pcb_ext->ext_vm86; 787 if (vm86->vm86_inited == 0) 788 return (EINVAL); 789 790 /* Go back to user mode if both flags are set. */ 791 if ((eflags & PSL_VIP) && (eflags & PSL_VIF)) 792 trapsignal(p, SIGBUS, 0); 793 794 if (vm86->vm86_has_vme) { 795 eflags = (tf->tf_eflags & ~VME_USERCHANGE) | 796 (eflags & VME_USERCHANGE) | PSL_VM; 797 } else { 798 vm86->vm86_eflags = eflags; /* save VIF, VIP */ 799 eflags = (tf->tf_eflags & ~VM_USERCHANGE) | (eflags & VM_USERCHANGE) | PSL_VM; 800 } 801 tf->tf_vm86_ds = scp->sc_ds; 802 tf->tf_vm86_es = scp->sc_es; 803 tf->tf_vm86_fs = scp->sc_fs; 804 tf->tf_vm86_gs = scp->sc_gs; 805 tf->tf_ds = _udatasel; 806 tf->tf_es = _udatasel; 807 tf->tf_fs = _udatasel; 808 } else { 809 /* 810 * Don't allow users to change privileged or reserved flags. 811 */ 812 /* 813 * XXX do allow users to change the privileged flag PSL_RF. 814 * The cpu sets PSL_RF in tf_eflags for faults. Debuggers 815 * should sometimes set it there too. tf_eflags is kept in 816 * the signal context during signal handling and there is no 817 * other place to remember it, so the PSL_RF bit may be 818 * corrupted by the signal handler without us knowing. 819 * Corruption of the PSL_RF bit at worst causes one more or 820 * one less debugger trap, so allowing it is fairly harmless. 821 */ 822 if (!EFL_SECURE(eflags & ~PSL_RF, regs->tf_eflags & ~PSL_RF)) { 823 return (EINVAL); 824 } 825 826 /* 827 * Don't allow users to load a valid privileged %cs. Let the 828 * hardware check for invalid selectors, excess privilege in 829 * other selectors, invalid %eip's and invalid %esp's. 830 */ 831 if (!CS_SECURE(scp->sc_cs)) { 832 trapsignal(p, SIGBUS, T_PROTFLT); 833 return (EINVAL); 834 } 835 regs->tf_ds = scp->sc_ds; 836 regs->tf_es = scp->sc_es; 837 regs->tf_fs = scp->sc_fs; 838 } 839 840 /* Restore remaining registers. */ 841 regs->tf_eax = scp->sc_eax; 842 regs->tf_ebx = scp->sc_ebx; 843 regs->tf_ecx = scp->sc_ecx; 844 regs->tf_edx = scp->sc_edx; 845 regs->tf_esi = scp->sc_esi; 846 regs->tf_edi = scp->sc_edi; 847 regs->tf_cs = scp->sc_cs; 848 regs->tf_ss = scp->sc_ss; 849 regs->tf_isp = scp->sc_isp; 850 851 PROC_LOCK(p); 852#if defined(COMPAT_43) || defined(COMPAT_SUNOS) 853 if (scp->sc_onstack & 1) 854 p->p_sigstk.ss_flags |= SS_ONSTACK; 855 else 856 p->p_sigstk.ss_flags &= ~SS_ONSTACK; 857#endif 858 859 SIGSETOLD(p->p_sigmask, scp->sc_mask); 860 SIG_CANTMASK(p->p_sigmask); 861 PROC_UNLOCK(p); 862 regs->tf_ebp = scp->sc_fp; 863 regs->tf_esp = scp->sc_sp; 864 regs->tf_eip = scp->sc_pc; 865 regs->tf_eflags = eflags; 866 return (EJUSTRETURN); 867} 868 869int 870sigreturn(p, uap) 871 struct proc *p; 872 struct sigreturn_args /* { 873 ucontext_t *sigcntxp; 874 } */ *uap; 875{ 876 struct trapframe *regs; 877 ucontext_t *ucp; 878 int cs, eflags; 879 880 ucp = uap->sigcntxp; 881 if (!useracc((caddr_t)ucp, sizeof(struct osigcontext), VM_PROT_READ)) 882 return (EFAULT); 883 if (((struct osigcontext *)ucp)->sc_trapno == 0x01d516) 884 return (osigreturn(p, (struct osigreturn_args *)uap)); 885 886 /* 887 * Since ucp is not an osigcontext but a ucontext_t, we have to 888 * check again if all of it is accessible. A ucontext_t is 889 * much larger, so instead of just checking for the pointer 890 * being valid for the size of an osigcontext, now check for 891 * it being valid for a whole, new-style ucontext_t. 892 */ 893 if (!useracc((caddr_t)ucp, sizeof(*ucp), VM_PROT_READ)) 894 return (EFAULT); 895 896 regs = p->p_md.md_regs; 897 eflags = ucp->uc_mcontext.mc_eflags; 898 if (eflags & PSL_VM) { 899 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs; 900 struct vm86_kernel *vm86; 901 902 /* 903 * if pcb_ext == 0 or vm86_inited == 0, the user hasn't 904 * set up the vm86 area, and we can't enter vm86 mode. 905 */ 906 if (p->p_addr->u_pcb.pcb_ext == 0) 907 return (EINVAL); 908 vm86 = &p->p_addr->u_pcb.pcb_ext->ext_vm86; 909 if (vm86->vm86_inited == 0) 910 return (EINVAL); 911 912 /* Go back to user mode if both flags are set. */ 913 if ((eflags & PSL_VIP) && (eflags & PSL_VIF)) 914 trapsignal(p, SIGBUS, 0); 915 916 if (vm86->vm86_has_vme) { 917 eflags = (tf->tf_eflags & ~VME_USERCHANGE) | 918 (eflags & VME_USERCHANGE) | PSL_VM; 919 } else { 920 vm86->vm86_eflags = eflags; /* save VIF, VIP */ 921 eflags = (tf->tf_eflags & ~VM_USERCHANGE) | (eflags & VM_USERCHANGE) | PSL_VM; 922 } 923 bcopy(&ucp->uc_mcontext.mc_fs, tf, sizeof(struct trapframe)); 924 tf->tf_eflags = eflags; 925 tf->tf_vm86_ds = tf->tf_ds; 926 tf->tf_vm86_es = tf->tf_es; 927 tf->tf_vm86_fs = tf->tf_fs; 928 tf->tf_vm86_gs = ucp->uc_mcontext.mc_gs; 929 tf->tf_ds = _udatasel; 930 tf->tf_es = _udatasel; 931 tf->tf_fs = _udatasel; 932 } else { 933 /* 934 * Don't allow users to change privileged or reserved flags. 935 */ 936 /* 937 * XXX do allow users to change the privileged flag PSL_RF. 938 * The cpu sets PSL_RF in tf_eflags for faults. Debuggers 939 * should sometimes set it there too. tf_eflags is kept in 940 * the signal context during signal handling and there is no 941 * other place to remember it, so the PSL_RF bit may be 942 * corrupted by the signal handler without us knowing. 943 * Corruption of the PSL_RF bit at worst causes one more or 944 * one less debugger trap, so allowing it is fairly harmless. 945 */ 946 if (!EFL_SECURE(eflags & ~PSL_RF, regs->tf_eflags & ~PSL_RF)) { 947 printf("sigreturn: eflags = 0x%x\n", eflags); 948 return (EINVAL); 949 } 950 951 /* 952 * Don't allow users to load a valid privileged %cs. Let the 953 * hardware check for invalid selectors, excess privilege in 954 * other selectors, invalid %eip's and invalid %esp's. 955 */ 956 cs = ucp->uc_mcontext.mc_cs; 957 if (!CS_SECURE(cs)) { 958 printf("sigreturn: cs = 0x%x\n", cs); 959 trapsignal(p, SIGBUS, T_PROTFLT); 960 return (EINVAL); 961 } 962 963 bcopy(&ucp->uc_mcontext.mc_fs, regs, sizeof(*regs)); 964 } 965 966 PROC_LOCK(p); 967#if defined(COMPAT_43) || defined(COMPAT_SUNOS) 968 if (ucp->uc_mcontext.mc_onstack & 1) 969 p->p_sigstk.ss_flags |= SS_ONSTACK; 970 else 971 p->p_sigstk.ss_flags &= ~SS_ONSTACK; 972#endif 973 974 p->p_sigmask = ucp->uc_sigmask; 975 SIG_CANTMASK(p->p_sigmask); 976 PROC_UNLOCK(p); 977 return (EJUSTRETURN); 978} 979 980/* 981 * Machine dependent boot() routine 982 * 983 * I haven't seen anything to put here yet 984 * Possibly some stuff might be grafted back here from boot() 985 */ 986void 987cpu_boot(int howto) 988{ 989} 990 991/* 992 * Shutdown the CPU as much as possible 993 */ 994void 995cpu_halt(void) 996{ 997 for (;;) 998 __asm__ ("hlt"); 999} 1000 1001/* 1002 * Hook to idle the CPU when possible. This currently only works in 1003 * the !SMP case, as there is no clean way to ensure that a CPU will be 1004 * woken when there is work available for it. 1005 */ 1006static int cpu_idle_hlt = 1; 1007SYSCTL_INT(_machdep, OID_AUTO, cpu_idle_hlt, CTLFLAG_RW, 1008 &cpu_idle_hlt, 0, "Idle loop HLT enable"); 1009 1010/* 1011 * Note that we have to be careful here to avoid a race between checking 1012 * procrunnable() and actually halting. If we don't do this, we may waste 1013 * the time between calling hlt and the next interrupt even though there 1014 * is a runnable process. 1015 */ 1016void 1017cpu_idle(void) 1018{ 1019#ifndef SMP 1020 if (cpu_idle_hlt) { 1021 disable_intr(); 1022 if (procrunnable()) 1023 enable_intr(); 1024 else { 1025 enable_intr(); 1026 __asm __volatile("hlt"); 1027 } 1028 } 1029#endif 1030} 1031 1032/* 1033 * Clear registers on exec 1034 */ 1035void 1036setregs(p, entry, stack, ps_strings) 1037 struct proc *p; 1038 u_long entry; 1039 u_long stack; 1040 u_long ps_strings; 1041{ 1042 struct trapframe *regs = p->p_md.md_regs; 1043 struct pcb *pcb = &p->p_addr->u_pcb; 1044 1045 if (pcb->pcb_ldt) 1046 user_ldt_free(pcb); 1047 1048 bzero((char *)regs, sizeof(struct trapframe)); 1049 regs->tf_eip = entry; 1050 regs->tf_esp = stack; 1051 regs->tf_eflags = PSL_USER | (regs->tf_eflags & PSL_T); 1052 regs->tf_ss = _udatasel; 1053 regs->tf_ds = _udatasel; 1054 regs->tf_es = _udatasel; 1055 regs->tf_fs = _udatasel; 1056 regs->tf_cs = _ucodesel; 1057 1058 /* PS_STRINGS value for BSD/OS binaries. It is 0 for non-BSD/OS. */ 1059 regs->tf_ebx = ps_strings; 1060 1061 /* reset %gs as well */ 1062 if (pcb == PCPU_GET(curpcb)) 1063 load_gs(_udatasel); 1064 else 1065 pcb->pcb_gs = _udatasel; 1066 1067 /* 1068 * Reset the hardware debug registers if they were in use. 1069 * They won't have any meaning for the newly exec'd process. 1070 */ 1071 if (pcb->pcb_flags & PCB_DBREGS) { 1072 pcb->pcb_dr0 = 0; 1073 pcb->pcb_dr1 = 0; 1074 pcb->pcb_dr2 = 0; 1075 pcb->pcb_dr3 = 0; 1076 pcb->pcb_dr6 = 0; 1077 pcb->pcb_dr7 = 0; 1078 if (pcb == PCPU_GET(curpcb)) { 1079 /* 1080 * Clear the debug registers on the running 1081 * CPU, otherwise they will end up affecting 1082 * the next process we switch to. 1083 */ 1084 reset_dbregs(); 1085 } 1086 pcb->pcb_flags &= ~PCB_DBREGS; 1087 } 1088 1089 /* 1090 * Initialize the math emulator (if any) for the current process. 1091 * Actually, just clear the bit that says that the emulator has 1092 * been initialized. Initialization is delayed until the process 1093 * traps to the emulator (if it is done at all) mainly because 1094 * emulators don't provide an entry point for initialization. 1095 */ 1096 p->p_addr->u_pcb.pcb_flags &= ~FP_SOFTFP; 1097 1098 /* 1099 * Arrange to trap the next npx or `fwait' instruction (see npx.c 1100 * for why fwait must be trapped at least if there is an npx or an 1101 * emulator). This is mainly to handle the case where npx0 is not 1102 * configured, since the npx routines normally set up the trap 1103 * otherwise. It should be done only at boot time, but doing it 1104 * here allows modifying `npx_exists' for testing the emulator on 1105 * systems with an npx. 1106 */ 1107 load_cr0(rcr0() | CR0_MP | CR0_TS); 1108 1109#ifdef DEV_NPX 1110 /* Initialize the npx (if any) for the current process. */ 1111 npxinit(__INITIAL_NPXCW__); 1112#endif 1113 1114 /* 1115 * XXX - Linux emulator 1116 * Make sure sure edx is 0x0 on entry. Linux binaries depend 1117 * on it. 1118 */ 1119 p->p_retval[1] = 0; 1120} 1121 1122void 1123cpu_setregs(void) 1124{ 1125 unsigned int cr0; 1126 1127 cr0 = rcr0(); 1128 cr0 |= CR0_NE; /* Done by npxinit() */ 1129 cr0 |= CR0_MP | CR0_TS; /* Done at every execve() too. */ 1130#ifndef I386_CPU 1131 cr0 |= CR0_WP | CR0_AM; 1132#endif 1133 load_cr0(cr0); 1134 load_gs(_udatasel); 1135} 1136 1137static int 1138sysctl_machdep_adjkerntz(SYSCTL_HANDLER_ARGS) 1139{ 1140 int error; 1141 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, 1142 req); 1143 if (!error && req->newptr) 1144 resettodr(); 1145 return (error); 1146} 1147 1148SYSCTL_PROC(_machdep, CPU_ADJKERNTZ, adjkerntz, CTLTYPE_INT|CTLFLAG_RW, 1149 &adjkerntz, 0, sysctl_machdep_adjkerntz, "I", ""); 1150 1151SYSCTL_INT(_machdep, CPU_DISRTCSET, disable_rtc_set, 1152 CTLFLAG_RW, &disable_rtc_set, 0, ""); 1153 1154SYSCTL_STRUCT(_machdep, CPU_BOOTINFO, bootinfo, 1155 CTLFLAG_RD, &bootinfo, bootinfo, ""); 1156 1157SYSCTL_INT(_machdep, CPU_WALLCLOCK, wall_cmos_clock, 1158 CTLFLAG_RW, &wall_cmos_clock, 0, ""); 1159 1160/* 1161 * Initialize 386 and configure to run kernel 1162 */ 1163 1164/* 1165 * Initialize segments & interrupt table 1166 */ 1167 1168int _default_ldt; 1169union descriptor gdt[NGDT * MAXCPU]; /* global descriptor table */ 1170static struct gate_descriptor idt0[NIDT]; 1171struct gate_descriptor *idt = &idt0[0]; /* interrupt descriptor table */ 1172union descriptor ldt[NLDT]; /* local descriptor table */ 1173#ifdef SMP 1174/* table descriptors - used to load tables by microp */ 1175struct region_descriptor r_gdt, r_idt; 1176#endif 1177 1178int private_tss; /* flag indicating private tss */ 1179 1180#if defined(I586_CPU) && !defined(NO_F00F_HACK) 1181extern int has_f00f_bug; 1182#endif 1183 1184static struct i386tss dblfault_tss; 1185static char dblfault_stack[PAGE_SIZE]; 1186 1187extern struct user *proc0paddr; 1188 1189 1190/* software prototypes -- in more palatable form */ 1191struct soft_segment_descriptor gdt_segs[] = { 1192/* GNULL_SEL 0 Null Descriptor */ 1193{ 0x0, /* segment base address */ 1194 0x0, /* length */ 1195 0, /* segment type */ 1196 0, /* segment descriptor priority level */ 1197 0, /* segment descriptor present */ 1198 0, 0, 1199 0, /* default 32 vs 16 bit size */ 1200 0 /* limit granularity (byte/page units)*/ }, 1201/* GCODE_SEL 1 Code Descriptor for kernel */ 1202{ 0x0, /* segment base address */ 1203 0xfffff, /* length - all address space */ 1204 SDT_MEMERA, /* segment type */ 1205 0, /* segment descriptor priority level */ 1206 1, /* segment descriptor present */ 1207 0, 0, 1208 1, /* default 32 vs 16 bit size */ 1209 1 /* limit granularity (byte/page units)*/ }, 1210/* GDATA_SEL 2 Data Descriptor for kernel */ 1211{ 0x0, /* segment base address */ 1212 0xfffff, /* length - all address space */ 1213 SDT_MEMRWA, /* segment type */ 1214 0, /* segment descriptor priority level */ 1215 1, /* segment descriptor present */ 1216 0, 0, 1217 1, /* default 32 vs 16 bit size */ 1218 1 /* limit granularity (byte/page units)*/ }, 1219/* GPRIV_SEL 3 SMP Per-Processor Private Data Descriptor */ 1220{ 0x0, /* segment base address */ 1221 0xfffff, /* length - all address space */ 1222 SDT_MEMRWA, /* segment type */ 1223 0, /* segment descriptor priority level */ 1224 1, /* segment descriptor present */ 1225 0, 0, 1226 1, /* default 32 vs 16 bit size */ 1227 1 /* limit granularity (byte/page units)*/ }, 1228/* GPROC0_SEL 4 Proc 0 Tss Descriptor */ 1229{ 1230 0x0, /* segment base address */ 1231 sizeof(struct i386tss)-1,/* length - all address space */ 1232 SDT_SYS386TSS, /* segment type */ 1233 0, /* segment descriptor priority level */ 1234 1, /* segment descriptor present */ 1235 0, 0, 1236 0, /* unused - default 32 vs 16 bit size */ 1237 0 /* limit granularity (byte/page units)*/ }, 1238/* GLDT_SEL 5 LDT Descriptor */ 1239{ (int) ldt, /* segment base address */ 1240 sizeof(ldt)-1, /* length - all address space */ 1241 SDT_SYSLDT, /* segment type */ 1242 SEL_UPL, /* segment descriptor priority level */ 1243 1, /* segment descriptor present */ 1244 0, 0, 1245 0, /* unused - default 32 vs 16 bit size */ 1246 0 /* limit granularity (byte/page units)*/ }, 1247/* GUSERLDT_SEL 6 User LDT Descriptor per process */ 1248{ (int) ldt, /* segment base address */ 1249 (512 * sizeof(union descriptor)-1), /* length */ 1250 SDT_SYSLDT, /* segment type */ 1251 0, /* segment descriptor priority level */ 1252 1, /* segment descriptor present */ 1253 0, 0, 1254 0, /* unused - default 32 vs 16 bit size */ 1255 0 /* limit granularity (byte/page units)*/ }, 1256/* GTGATE_SEL 7 Null Descriptor - Placeholder */ 1257{ 0x0, /* segment base address */ 1258 0x0, /* length - all address space */ 1259 0, /* segment type */ 1260 0, /* segment descriptor priority level */ 1261 0, /* segment descriptor present */ 1262 0, 0, 1263 0, /* default 32 vs 16 bit size */ 1264 0 /* limit granularity (byte/page units)*/ }, 1265/* GBIOSLOWMEM_SEL 8 BIOS access to realmode segment 0x40, must be #8 in GDT */ 1266{ 0x400, /* segment base address */ 1267 0xfffff, /* length */ 1268 SDT_MEMRWA, /* segment type */ 1269 0, /* segment descriptor priority level */ 1270 1, /* segment descriptor present */ 1271 0, 0, 1272 1, /* default 32 vs 16 bit size */ 1273 1 /* limit granularity (byte/page units)*/ }, 1274/* GPANIC_SEL 9 Panic Tss Descriptor */ 1275{ (int) &dblfault_tss, /* segment base address */ 1276 sizeof(struct i386tss)-1,/* length - all address space */ 1277 SDT_SYS386TSS, /* segment type */ 1278 0, /* segment descriptor priority level */ 1279 1, /* segment descriptor present */ 1280 0, 0, 1281 0, /* unused - default 32 vs 16 bit size */ 1282 0 /* limit granularity (byte/page units)*/ }, 1283/* GBIOSCODE32_SEL 10 BIOS 32-bit interface (32bit Code) */ 1284{ 0, /* segment base address (overwritten) */ 1285 0xfffff, /* length */ 1286 SDT_MEMERA, /* segment type */ 1287 0, /* segment descriptor priority level */ 1288 1, /* segment descriptor present */ 1289 0, 0, 1290 0, /* default 32 vs 16 bit size */ 1291 1 /* limit granularity (byte/page units)*/ }, 1292/* GBIOSCODE16_SEL 11 BIOS 32-bit interface (16bit Code) */ 1293{ 0, /* segment base address (overwritten) */ 1294 0xfffff, /* length */ 1295 SDT_MEMERA, /* segment type */ 1296 0, /* segment descriptor priority level */ 1297 1, /* segment descriptor present */ 1298 0, 0, 1299 0, /* default 32 vs 16 bit size */ 1300 1 /* limit granularity (byte/page units)*/ }, 1301/* GBIOSDATA_SEL 12 BIOS 32-bit interface (Data) */ 1302{ 0, /* segment base address (overwritten) */ 1303 0xfffff, /* length */ 1304 SDT_MEMRWA, /* segment type */ 1305 0, /* segment descriptor priority level */ 1306 1, /* segment descriptor present */ 1307 0, 0, 1308 1, /* default 32 vs 16 bit size */ 1309 1 /* limit granularity (byte/page units)*/ }, 1310/* GBIOSUTIL_SEL 13 BIOS 16-bit interface (Utility) */ 1311{ 0, /* segment base address (overwritten) */ 1312 0xfffff, /* length */ 1313 SDT_MEMRWA, /* segment type */ 1314 0, /* segment descriptor priority level */ 1315 1, /* segment descriptor present */ 1316 0, 0, 1317 0, /* default 32 vs 16 bit size */ 1318 1 /* limit granularity (byte/page units)*/ }, 1319/* GBIOSARGS_SEL 14 BIOS 16-bit interface (Arguments) */ 1320{ 0, /* segment base address (overwritten) */ 1321 0xfffff, /* length */ 1322 SDT_MEMRWA, /* segment type */ 1323 0, /* segment descriptor priority level */ 1324 1, /* segment descriptor present */ 1325 0, 0, 1326 0, /* default 32 vs 16 bit size */ 1327 1 /* limit granularity (byte/page units)*/ }, 1328}; 1329 1330static struct soft_segment_descriptor ldt_segs[] = { 1331 /* Null Descriptor - overwritten by call gate */ 1332{ 0x0, /* segment base address */ 1333 0x0, /* length - all address space */ 1334 0, /* segment type */ 1335 0, /* segment descriptor priority level */ 1336 0, /* segment descriptor present */ 1337 0, 0, 1338 0, /* default 32 vs 16 bit size */ 1339 0 /* limit granularity (byte/page units)*/ }, 1340 /* Null Descriptor - overwritten by call gate */ 1341{ 0x0, /* segment base address */ 1342 0x0, /* length - all address space */ 1343 0, /* segment type */ 1344 0, /* segment descriptor priority level */ 1345 0, /* segment descriptor present */ 1346 0, 0, 1347 0, /* default 32 vs 16 bit size */ 1348 0 /* limit granularity (byte/page units)*/ }, 1349 /* Null Descriptor - overwritten by call gate */ 1350{ 0x0, /* segment base address */ 1351 0x0, /* length - all address space */ 1352 0, /* segment type */ 1353 0, /* segment descriptor priority level */ 1354 0, /* segment descriptor present */ 1355 0, 0, 1356 0, /* default 32 vs 16 bit size */ 1357 0 /* limit granularity (byte/page units)*/ }, 1358 /* Code Descriptor for user */ 1359{ 0x0, /* segment base address */ 1360 0xfffff, /* length - all address space */ 1361 SDT_MEMERA, /* segment type */ 1362 SEL_UPL, /* segment descriptor priority level */ 1363 1, /* segment descriptor present */ 1364 0, 0, 1365 1, /* default 32 vs 16 bit size */ 1366 1 /* limit granularity (byte/page units)*/ }, 1367 /* Null Descriptor - overwritten by call gate */ 1368{ 0x0, /* segment base address */ 1369 0x0, /* length - all address space */ 1370 0, /* segment type */ 1371 0, /* segment descriptor priority level */ 1372 0, /* segment descriptor present */ 1373 0, 0, 1374 0, /* default 32 vs 16 bit size */ 1375 0 /* limit granularity (byte/page units)*/ }, 1376 /* Data Descriptor for user */ 1377{ 0x0, /* segment base address */ 1378 0xfffff, /* length - all address space */ 1379 SDT_MEMRWA, /* segment type */ 1380 SEL_UPL, /* segment descriptor priority level */ 1381 1, /* segment descriptor present */ 1382 0, 0, 1383 1, /* default 32 vs 16 bit size */ 1384 1 /* limit granularity (byte/page units)*/ }, 1385}; 1386 1387void 1388setidt(idx, func, typ, dpl, selec) 1389 int idx; 1390 inthand_t *func; 1391 int typ; 1392 int dpl; 1393 int selec; 1394{ 1395 struct gate_descriptor *ip; 1396 1397 ip = idt + idx; 1398 ip->gd_looffset = (int)func; 1399 ip->gd_selector = selec; 1400 ip->gd_stkcpy = 0; 1401 ip->gd_xx = 0; 1402 ip->gd_type = typ; 1403 ip->gd_dpl = dpl; 1404 ip->gd_p = 1; 1405 ip->gd_hioffset = ((int)func)>>16 ; 1406} 1407 1408#define IDTVEC(name) __CONCAT(X,name) 1409 1410extern inthand_t 1411 IDTVEC(div), IDTVEC(dbg), IDTVEC(nmi), IDTVEC(bpt), IDTVEC(ofl), 1412 IDTVEC(bnd), IDTVEC(ill), IDTVEC(dna), IDTVEC(fpusegm), 1413 IDTVEC(tss), IDTVEC(missing), IDTVEC(stk), IDTVEC(prot), 1414 IDTVEC(page), IDTVEC(mchk), IDTVEC(rsvd), IDTVEC(fpu), IDTVEC(align), 1415 IDTVEC(lcall_syscall), IDTVEC(int0x80_syscall); 1416 1417void 1418sdtossd(sd, ssd) 1419 struct segment_descriptor *sd; 1420 struct soft_segment_descriptor *ssd; 1421{ 1422 ssd->ssd_base = (sd->sd_hibase << 24) | sd->sd_lobase; 1423 ssd->ssd_limit = (sd->sd_hilimit << 16) | sd->sd_lolimit; 1424 ssd->ssd_type = sd->sd_type; 1425 ssd->ssd_dpl = sd->sd_dpl; 1426 ssd->ssd_p = sd->sd_p; 1427 ssd->ssd_def32 = sd->sd_def32; 1428 ssd->ssd_gran = sd->sd_gran; 1429} 1430 1431#define PHYSMAP_SIZE (2 * 8) 1432 1433/* 1434 * Populate the (physmap) array with base/bound pairs describing the 1435 * available physical memory in the system, then test this memory and 1436 * build the phys_avail array describing the actually-available memory. 1437 * 1438 * If we cannot accurately determine the physical memory map, then use 1439 * value from the 0xE801 call, and failing that, the RTC. 1440 * 1441 * Total memory size may be set by the kernel environment variable 1442 * hw.physmem or the compile-time define MAXMEM. 1443 */ 1444static void 1445getmemsize(int first) 1446{ 1447 int i, physmap_idx, pa_indx; 1448 u_int basemem, extmem; 1449 struct vm86frame vmf; 1450 struct vm86context vmc; 1451 vm_offset_t pa, physmap[PHYSMAP_SIZE]; 1452 pt_entry_t pte; 1453 const char *cp; 1454 struct bios_smap *smap; 1455 1456 bzero(&vmf, sizeof(struct vm86frame)); 1457 bzero(physmap, sizeof(physmap)); 1458 1459 /* 1460 * Perform "base memory" related probes & setup 1461 */ 1462 vm86_intcall(0x12, &vmf); 1463 basemem = vmf.vmf_ax; 1464 if (basemem > 640) { 1465 printf("Preposterous BIOS basemem of %uK, truncating to 640K\n", 1466 basemem); 1467 basemem = 640; 1468 } 1469 1470 /* 1471 * XXX if biosbasemem is now < 640, there is a `hole' 1472 * between the end of base memory and the start of 1473 * ISA memory. The hole may be empty or it may 1474 * contain BIOS code or data. Map it read/write so 1475 * that the BIOS can write to it. (Memory from 0 to 1476 * the physical end of the kernel is mapped read-only 1477 * to begin with and then parts of it are remapped. 1478 * The parts that aren't remapped form holes that 1479 * remain read-only and are unused by the kernel. 1480 * The base memory area is below the physical end of 1481 * the kernel and right now forms a read-only hole. 1482 * The part of it from PAGE_SIZE to 1483 * (trunc_page(biosbasemem * 1024) - 1) will be 1484 * remapped and used by the kernel later.) 1485 * 1486 * This code is similar to the code used in 1487 * pmap_mapdev, but since no memory needs to be 1488 * allocated we simply change the mapping. 1489 */ 1490 for (pa = trunc_page(basemem * 1024); 1491 pa < ISA_HOLE_START; pa += PAGE_SIZE) { 1492 pte = (pt_entry_t)vtopte(pa + KERNBASE); 1493 *pte = pa | PG_RW | PG_V; 1494 } 1495 1496 /* 1497 * if basemem != 640, map pages r/w into vm86 page table so 1498 * that the bios can scribble on it. 1499 */ 1500 pte = (pt_entry_t)vm86paddr; 1501 for (i = basemem / 4; i < 160; i++) 1502 pte[i] = (i << PAGE_SHIFT) | PG_V | PG_RW | PG_U; 1503 1504 /* 1505 * map page 1 R/W into the kernel page table so we can use it 1506 * as a buffer. The kernel will unmap this page later. 1507 */ 1508 pte = (pt_entry_t)vtopte(KERNBASE + (1 << PAGE_SHIFT)); 1509 *pte = (1 << PAGE_SHIFT) | PG_RW | PG_V; 1510 1511 /* 1512 * get memory map with INT 15:E820 1513 */ 1514 vmc.npages = 0; 1515 smap = (void *)vm86_addpage(&vmc, 1, KERNBASE + (1 << PAGE_SHIFT)); 1516 vm86_getptr(&vmc, (vm_offset_t)smap, &vmf.vmf_es, &vmf.vmf_di); 1517 1518 physmap_idx = 0; 1519 vmf.vmf_ebx = 0; 1520 do { 1521 vmf.vmf_eax = 0xE820; 1522 vmf.vmf_edx = SMAP_SIG; 1523 vmf.vmf_ecx = sizeof(struct bios_smap); 1524 i = vm86_datacall(0x15, &vmf, &vmc); 1525 if (i || vmf.vmf_eax != SMAP_SIG) 1526 break; 1527 if (boothowto & RB_VERBOSE) 1528 printf("SMAP type=%02x base=%08x %08x len=%08x %08x\n", 1529 smap->type, 1530 *(u_int32_t *)((char *)&smap->base + 4), 1531 (u_int32_t)smap->base, 1532 *(u_int32_t *)((char *)&smap->length + 4), 1533 (u_int32_t)smap->length); 1534 1535 if (smap->type != 0x01) 1536 goto next_run; 1537 1538 if (smap->length == 0) 1539 goto next_run; 1540 1541 if (smap->base >= 0xffffffff) { 1542 printf("%uK of memory above 4GB ignored\n", 1543 (u_int)(smap->length / 1024)); 1544 goto next_run; 1545 } 1546 1547 for (i = 0; i <= physmap_idx; i += 2) { 1548 if (smap->base < physmap[i + 1]) { 1549 if (boothowto & RB_VERBOSE) 1550 printf( 1551 "Overlapping or non-montonic memory region, ignoring second region\n"); 1552 goto next_run; 1553 } 1554 } 1555 1556 if (smap->base == physmap[physmap_idx + 1]) { 1557 physmap[physmap_idx + 1] += smap->length; 1558 goto next_run; 1559 } 1560 1561 physmap_idx += 2; 1562 if (physmap_idx == PHYSMAP_SIZE) { 1563 printf( 1564 "Too many segments in the physical address map, giving up\n"); 1565 break; 1566 } 1567 physmap[physmap_idx] = smap->base; 1568 physmap[physmap_idx + 1] = smap->base + smap->length; 1569next_run: 1570 } while (vmf.vmf_ebx != 0); 1571 1572 if (physmap[1] != 0) 1573 goto physmap_done; 1574 1575 /* 1576 * If we failed above, try memory map with INT 15:E801 1577 */ 1578 vmf.vmf_ax = 0xE801; 1579 if (vm86_intcall(0x15, &vmf) == 0) { 1580 extmem = vmf.vmf_cx + vmf.vmf_dx * 64; 1581 } else { 1582#if 0 1583 vmf.vmf_ah = 0x88; 1584 vm86_intcall(0x15, &vmf); 1585 extmem = vmf.vmf_ax; 1586#else 1587 /* 1588 * Prefer the RTC value for extended memory. 1589 */ 1590 extmem = rtcin(RTC_EXTLO) + (rtcin(RTC_EXTHI) << 8); 1591#endif 1592 } 1593 1594 /* 1595 * Special hack for chipsets that still remap the 384k hole when 1596 * there's 16MB of memory - this really confuses people that 1597 * are trying to use bus mastering ISA controllers with the 1598 * "16MB limit"; they only have 16MB, but the remapping puts 1599 * them beyond the limit. 1600 * 1601 * If extended memory is between 15-16MB (16-17MB phys address range), 1602 * chop it to 15MB. 1603 */ 1604 if ((extmem > 15 * 1024) && (extmem < 16 * 1024)) 1605 extmem = 15 * 1024; 1606 1607 physmap[0] = 0; 1608 physmap[1] = basemem * 1024; 1609 physmap_idx = 2; 1610 physmap[physmap_idx] = 0x100000; 1611 physmap[physmap_idx + 1] = physmap[physmap_idx] + extmem * 1024; 1612 1613physmap_done: 1614 /* 1615 * Now, physmap contains a map of physical memory. 1616 */ 1617 1618#ifdef SMP 1619 /* make hole for AP bootstrap code */ 1620 physmap[1] = mp_bootaddress(physmap[1] / 1024); 1621 1622 /* look for the MP hardware - needed for apic addresses */ 1623 i386_mp_probe(); 1624#endif 1625 1626 /* 1627 * Maxmem isn't the "maximum memory", it's one larger than the 1628 * highest page of the physical address space. It should be 1629 * called something like "Maxphyspage". We may adjust this 1630 * based on ``hw.physmem'' and the results of the memory test. 1631 */ 1632 Maxmem = atop(physmap[physmap_idx + 1]); 1633 1634#ifdef MAXMEM 1635 Maxmem = MAXMEM / 4; 1636#endif 1637 1638 /* 1639 * hw.maxmem is a size in bytes; we also allow k, m, and g suffixes 1640 * for the appropriate modifiers. This overrides MAXMEM. 1641 */ 1642 if ((cp = getenv("hw.physmem")) != NULL) { 1643 u_int64_t AllowMem, sanity; 1644 char *ep; 1645 1646 sanity = AllowMem = strtouq(cp, &ep, 0); 1647 if ((ep != cp) && (*ep != 0)) { 1648 switch(*ep) { 1649 case 'g': 1650 case 'G': 1651 AllowMem <<= 10; 1652 case 'm': 1653 case 'M': 1654 AllowMem <<= 10; 1655 case 'k': 1656 case 'K': 1657 AllowMem <<= 10; 1658 break; 1659 default: 1660 AllowMem = sanity = 0; 1661 } 1662 if (AllowMem < sanity) 1663 AllowMem = 0; 1664 } 1665 if (AllowMem == 0) 1666 printf("Ignoring invalid memory size of '%s'\n", cp); 1667 else 1668 Maxmem = atop(AllowMem); 1669 } 1670 1671 if (atop(physmap[physmap_idx + 1]) != Maxmem && 1672 (boothowto & RB_VERBOSE)) 1673 printf("Physical memory use set to %uK\n", Maxmem * 4); 1674 1675 /* 1676 * If Maxmem has been increased beyond what the system has detected, 1677 * extend the last memory segment to the new limit. 1678 */ 1679 if (atop(physmap[physmap_idx + 1]) < Maxmem) 1680 physmap[physmap_idx + 1] = ptoa(Maxmem); 1681 1682 /* call pmap initialization to make new kernel address space */ 1683 pmap_bootstrap(first, 0); 1684 1685 /* 1686 * Size up each available chunk of physical memory. 1687 */ 1688 physmap[0] = PAGE_SIZE; /* mask off page 0 */ 1689 pa_indx = 0; 1690 phys_avail[pa_indx++] = physmap[0]; 1691 phys_avail[pa_indx] = physmap[0]; 1692#if 0 1693 pte = (pt_entry_t)vtopte(KERNBASE); 1694#else 1695 pte = (pt_entry_t)CMAP1; 1696#endif 1697 1698 /* 1699 * physmap is in bytes, so when converting to page boundaries, 1700 * round up the start address and round down the end address. 1701 */ 1702 for (i = 0; i <= physmap_idx; i += 2) { 1703 vm_offset_t end; 1704 1705 end = ptoa(Maxmem); 1706 if (physmap[i + 1] < end) 1707 end = trunc_page(physmap[i + 1]); 1708 for (pa = round_page(physmap[i]); pa < end; pa += PAGE_SIZE) { 1709 int tmp, page_bad; 1710#if 0 1711 int *ptr = 0; 1712#else 1713 int *ptr = (int *)CADDR1; 1714#endif 1715 1716 /* 1717 * block out kernel memory as not available. 1718 */ 1719 if (pa >= 0x100000 && pa < first) 1720 continue; 1721 1722 page_bad = FALSE; 1723 1724 /* 1725 * map page into kernel: valid, read/write,non-cacheable 1726 */ 1727 *pte = pa | PG_V | PG_RW | PG_N; 1728 invltlb(); 1729 1730 tmp = *(int *)ptr; 1731 /* 1732 * Test for alternating 1's and 0's 1733 */ 1734 *(volatile int *)ptr = 0xaaaaaaaa; 1735 if (*(volatile int *)ptr != 0xaaaaaaaa) { 1736 page_bad = TRUE; 1737 } 1738 /* 1739 * Test for alternating 0's and 1's 1740 */ 1741 *(volatile int *)ptr = 0x55555555; 1742 if (*(volatile int *)ptr != 0x55555555) { 1743 page_bad = TRUE; 1744 } 1745 /* 1746 * Test for all 1's 1747 */ 1748 *(volatile int *)ptr = 0xffffffff; 1749 if (*(volatile int *)ptr != 0xffffffff) { 1750 page_bad = TRUE; 1751 } 1752 /* 1753 * Test for all 0's 1754 */ 1755 *(volatile int *)ptr = 0x0; 1756 if (*(volatile int *)ptr != 0x0) { 1757 page_bad = TRUE; 1758 } 1759 /* 1760 * Restore original value. 1761 */ 1762 *(int *)ptr = tmp; 1763 1764 /* 1765 * Adjust array of valid/good pages. 1766 */ 1767 if (page_bad == TRUE) { 1768 continue; 1769 } 1770 /* 1771 * If this good page is a continuation of the 1772 * previous set of good pages, then just increase 1773 * the end pointer. Otherwise start a new chunk. 1774 * Note that "end" points one higher than end, 1775 * making the range >= start and < end. 1776 * If we're also doing a speculative memory 1777 * test and we at or past the end, bump up Maxmem 1778 * so that we keep going. The first bad page 1779 * will terminate the loop. 1780 */ 1781 if (phys_avail[pa_indx] == pa) { 1782 phys_avail[pa_indx] += PAGE_SIZE; 1783 } else { 1784 pa_indx++; 1785 if (pa_indx == PHYS_AVAIL_ARRAY_END) { 1786 printf("Too many holes in the physical address space, giving up\n"); 1787 pa_indx--; 1788 break; 1789 } 1790 phys_avail[pa_indx++] = pa; /* start */ 1791 phys_avail[pa_indx] = pa + PAGE_SIZE; /* end */ 1792 } 1793 physmem++; 1794 } 1795 } 1796 *pte = 0; 1797 invltlb(); 1798 1799 /* 1800 * XXX 1801 * The last chunk must contain at least one page plus the message 1802 * buffer to avoid complicating other code (message buffer address 1803 * calculation, etc.). 1804 */ 1805 while (phys_avail[pa_indx - 1] + PAGE_SIZE + 1806 round_page(MSGBUF_SIZE) >= phys_avail[pa_indx]) { 1807 physmem -= atop(phys_avail[pa_indx] - phys_avail[pa_indx - 1]); 1808 phys_avail[pa_indx--] = 0; 1809 phys_avail[pa_indx--] = 0; 1810 } 1811 1812 Maxmem = atop(phys_avail[pa_indx]); 1813 1814 /* Trim off space for the message buffer. */ 1815 phys_avail[pa_indx] -= round_page(MSGBUF_SIZE); 1816 1817 avail_end = phys_avail[pa_indx]; 1818} 1819 1820void 1821init386(first) 1822 int first; 1823{ 1824 int x; 1825 struct gate_descriptor *gdp; 1826 int gsel_tss; 1827#ifndef SMP 1828 /* table descriptors - used to load tables by microp */ 1829 struct region_descriptor r_gdt, r_idt; 1830#endif 1831 int off; 1832 1833 proc0.p_addr = proc0paddr; 1834 1835 atdevbase = ISA_HOLE_START + KERNBASE; 1836 1837 if (bootinfo.bi_modulep) { 1838 preload_metadata = (caddr_t)bootinfo.bi_modulep + KERNBASE; 1839 preload_bootstrap_relocate(KERNBASE); 1840 } else { 1841 printf("WARNING: loader(8) metadata is missing!\n"); 1842 } 1843 if (bootinfo.bi_envp) 1844 kern_envp = (caddr_t)bootinfo.bi_envp + KERNBASE; 1845 1846 /* 1847 * make gdt memory segments, the code segment goes up to end of the 1848 * page with etext in it, the data segment goes to the end of 1849 * the address space 1850 */ 1851 /* 1852 * XXX text protection is temporarily (?) disabled. The limit was 1853 * i386_btop(round_page(etext)) - 1. 1854 */ 1855 gdt_segs[GCODE_SEL].ssd_limit = i386_btop(0) - 1; 1856 gdt_segs[GDATA_SEL].ssd_limit = i386_btop(0) - 1; 1857#ifdef SMP 1858 gdt_segs[GPRIV_SEL].ssd_limit = 1859 i386_btop(sizeof(struct privatespace)) - 1; 1860 gdt_segs[GPRIV_SEL].ssd_base = (int) &SMP_prvspace[0]; 1861 gdt_segs[GPROC0_SEL].ssd_base = 1862 (int) &SMP_prvspace[0].globaldata.gd_common_tss; 1863 SMP_prvspace[0].globaldata.gd_prvspace = &SMP_prvspace[0].globaldata; 1864#else 1865 gdt_segs[GPRIV_SEL].ssd_limit = 1866 i386_btop(sizeof(struct globaldata)) - 1; 1867 gdt_segs[GPRIV_SEL].ssd_base = (int) &__globaldata; 1868 gdt_segs[GPROC0_SEL].ssd_base = 1869 (int) &__globaldata.gd_common_tss; 1870 __globaldata.gd_prvspace = &__globaldata; 1871#endif 1872 1873 for (x = 0; x < NGDT; x++) { 1874#ifdef BDE_DEBUGGER 1875 /* avoid overwriting db entries with APM ones */ 1876 if (x >= GAPMCODE32_SEL && x <= GAPMDATA_SEL) 1877 continue; 1878#endif 1879 ssdtosd(&gdt_segs[x], &gdt[x].sd); 1880 } 1881 1882 r_gdt.rd_limit = NGDT * sizeof(gdt[0]) - 1; 1883 r_gdt.rd_base = (int) gdt; 1884 lgdt(&r_gdt); 1885 1886 /* setup curproc so that mutexes work */ 1887 PCPU_SET(curproc, &proc0); 1888 PCPU_SET(spinlocks, NULL); 1889 1890 LIST_INIT(&proc0.p_contested); 1891 1892 mtx_init(&sched_lock, "sched lock", MTX_SPIN | MTX_RECURSE); 1893#ifdef SMP 1894 /* 1895 * Interrupts can happen very early, so initialize imen_mtx here, rather 1896 * than in init_locks(). 1897 */ 1898 mtx_init(&imen_mtx, "imen", MTX_SPIN); 1899#endif 1900 1901 /* 1902 * Giant is used early for at least debugger traps and unexpected traps. 1903 */ 1904 mtx_init(&Giant, "Giant", MTX_DEF | MTX_RECURSE); 1905 mtx_init(&proc0.p_mtx, "process lock", MTX_DEF); 1906 mtx_lock(&Giant); 1907 1908 /* make ldt memory segments */ 1909 /* 1910 * The data segment limit must not cover the user area because we 1911 * don't want the user area to be writable in copyout() etc. (page 1912 * level protection is lost in kernel mode on 386's). Also, we 1913 * don't want the user area to be writable directly (page level 1914 * protection of the user area is not available on 486's with 1915 * CR0_WP set, because there is no user-read/kernel-write mode). 1916 * 1917 * XXX - VM_MAXUSER_ADDRESS is an end address, not a max. And it 1918 * should be spelled ...MAX_USER... 1919 */ 1920#define VM_END_USER_RW_ADDRESS VM_MAXUSER_ADDRESS 1921 /* 1922 * The code segment limit has to cover the user area until we move 1923 * the signal trampoline out of the user area. This is safe because 1924 * the code segment cannot be written to directly. 1925 */ 1926#define VM_END_USER_R_ADDRESS (VM_END_USER_RW_ADDRESS + UPAGES * PAGE_SIZE) 1927 ldt_segs[LUCODE_SEL].ssd_limit = i386_btop(VM_END_USER_R_ADDRESS) - 1; 1928 ldt_segs[LUDATA_SEL].ssd_limit = i386_btop(VM_END_USER_RW_ADDRESS) - 1; 1929 for (x = 0; x < sizeof ldt_segs / sizeof ldt_segs[0]; x++) 1930 ssdtosd(&ldt_segs[x], &ldt[x].sd); 1931 1932 _default_ldt = GSEL(GLDT_SEL, SEL_KPL); 1933 lldt(_default_ldt); 1934 PCPU_SET(currentldt, _default_ldt); 1935 1936 /* exceptions */ 1937 for (x = 0; x < NIDT; x++) 1938 setidt(x, &IDTVEC(rsvd), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1939 setidt(0, &IDTVEC(div), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1940 setidt(1, &IDTVEC(dbg), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1941 setidt(2, &IDTVEC(nmi), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1942 setidt(3, &IDTVEC(bpt), SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL)); 1943 setidt(4, &IDTVEC(ofl), SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL)); 1944 setidt(5, &IDTVEC(bnd), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1945 setidt(6, &IDTVEC(ill), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1946 setidt(7, &IDTVEC(dna), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1947 setidt(8, 0, SDT_SYSTASKGT, SEL_KPL, GSEL(GPANIC_SEL, SEL_KPL)); 1948 setidt(9, &IDTVEC(fpusegm), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1949 setidt(10, &IDTVEC(tss), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1950 setidt(11, &IDTVEC(missing), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1951 setidt(12, &IDTVEC(stk), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1952 setidt(13, &IDTVEC(prot), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1953 setidt(14, &IDTVEC(page), SDT_SYS386IGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1954 setidt(15, &IDTVEC(rsvd), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1955 setidt(16, &IDTVEC(fpu), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1956 setidt(17, &IDTVEC(align), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1957 setidt(18, &IDTVEC(mchk), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1958 setidt(0x80, &IDTVEC(int0x80_syscall), 1959 SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL)); 1960 1961 r_idt.rd_limit = sizeof(idt0) - 1; 1962 r_idt.rd_base = (int) idt; 1963 lidt(&r_idt); 1964 1965 /* 1966 * We need this mutex before the console probe. 1967 */ 1968 mtx_init(&clock_lock, "clk", MTX_SPIN | MTX_RECURSE); 1969 1970 /* 1971 * Initialize the console before we print anything out. 1972 */ 1973 cninit(); 1974 1975#ifdef DEV_ISA 1976 isa_defaultirq(); 1977#endif 1978 1979#ifdef DDB 1980 kdb_init(); 1981 if (boothowto & RB_KDB) 1982 Debugger("Boot flags requested debugger"); 1983#endif 1984 1985 finishidentcpu(); /* Final stage of CPU initialization */ 1986 setidt(6, &IDTVEC(ill), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1987 setidt(13, &IDTVEC(prot), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1988 initializecpu(); /* Initialize CPU registers */ 1989 1990 /* make an initial tss so cpu can get interrupt stack on syscall! */ 1991 PCPU_SET(common_tss.tss_esp0, 1992 (int) proc0.p_addr + UPAGES*PAGE_SIZE - 16); 1993 PCPU_SET(common_tss.tss_ss0, GSEL(GDATA_SEL, SEL_KPL)); 1994 gsel_tss = GSEL(GPROC0_SEL, SEL_KPL); 1995 private_tss = 0; 1996 PCPU_SET(tss_gdt, &gdt[GPROC0_SEL].sd); 1997 PCPU_SET(common_tssd, *PCPU_GET(tss_gdt)); 1998 PCPU_SET(common_tss.tss_ioopt, (sizeof (struct i386tss)) << 16); 1999 ltr(gsel_tss); 2000 2001 dblfault_tss.tss_esp = dblfault_tss.tss_esp0 = dblfault_tss.tss_esp1 = 2002 dblfault_tss.tss_esp2 = (int) &dblfault_stack[sizeof(dblfault_stack)]; 2003 dblfault_tss.tss_ss = dblfault_tss.tss_ss0 = dblfault_tss.tss_ss1 = 2004 dblfault_tss.tss_ss2 = GSEL(GDATA_SEL, SEL_KPL); 2005 dblfault_tss.tss_cr3 = (int)IdlePTD; 2006 dblfault_tss.tss_eip = (int) dblfault_handler; 2007 dblfault_tss.tss_eflags = PSL_KERNEL; 2008 dblfault_tss.tss_ds = dblfault_tss.tss_es = 2009 dblfault_tss.tss_gs = GSEL(GDATA_SEL, SEL_KPL); 2010 dblfault_tss.tss_fs = GSEL(GPRIV_SEL, SEL_KPL); 2011 dblfault_tss.tss_cs = GSEL(GCODE_SEL, SEL_KPL); 2012 dblfault_tss.tss_ldt = GSEL(GLDT_SEL, SEL_KPL); 2013 2014 vm86_initialize(); 2015 getmemsize(first); 2016 2017 /* now running on new page tables, configured,and u/iom is accessible */ 2018 2019 /* Map the message buffer. */ 2020 for (off = 0; off < round_page(MSGBUF_SIZE); off += PAGE_SIZE) 2021 pmap_kenter((vm_offset_t)msgbufp + off, avail_end + off); 2022 2023 msgbufinit(msgbufp, MSGBUF_SIZE); 2024 2025 /* make a call gate to reenter kernel with */ 2026 gdp = &ldt[LSYS5CALLS_SEL].gd; 2027 2028 x = (int) &IDTVEC(lcall_syscall); 2029 gdp->gd_looffset = x; 2030 gdp->gd_selector = GSEL(GCODE_SEL,SEL_KPL); 2031 gdp->gd_stkcpy = 1; 2032 gdp->gd_type = SDT_SYS386CGT; 2033 gdp->gd_dpl = SEL_UPL; 2034 gdp->gd_p = 1; 2035 gdp->gd_hioffset = x >> 16; 2036 2037 /* XXX does this work? */ 2038 ldt[LBSDICALLS_SEL] = ldt[LSYS5CALLS_SEL]; 2039 ldt[LSOL26CALLS_SEL] = ldt[LSYS5CALLS_SEL]; 2040 2041 /* transfer to user mode */ 2042 2043 _ucodesel = LSEL(LUCODE_SEL, SEL_UPL); 2044 _udatasel = LSEL(LUDATA_SEL, SEL_UPL); 2045 2046 /* setup proc 0's pcb */ 2047 proc0.p_addr->u_pcb.pcb_flags = 0; 2048 proc0.p_addr->u_pcb.pcb_cr3 = (int)IdlePTD; 2049 proc0.p_addr->u_pcb.pcb_ext = 0; 2050 proc0.p_md.md_regs = &proc0_tf; 2051} 2052 2053#if defined(I586_CPU) && !defined(NO_F00F_HACK) 2054static void f00f_hack(void *unused); 2055SYSINIT(f00f_hack, SI_SUB_INTRINSIC, SI_ORDER_FIRST, f00f_hack, NULL); 2056 2057static void 2058f00f_hack(void *unused) { 2059 struct gate_descriptor *new_idt; 2060#ifndef SMP 2061 struct region_descriptor r_idt; 2062#endif 2063 vm_offset_t tmp; 2064 2065 if (!has_f00f_bug) 2066 return; 2067 2068 printf("Intel Pentium detected, installing workaround for F00F bug\n"); 2069 2070 r_idt.rd_limit = sizeof(idt0) - 1; 2071 2072 tmp = kmem_alloc(kernel_map, PAGE_SIZE * 2); 2073 if (tmp == 0) 2074 panic("kmem_alloc returned 0"); 2075 if (((unsigned int)tmp & (PAGE_SIZE-1)) != 0) 2076 panic("kmem_alloc returned non-page-aligned memory"); 2077 /* Put the first seven entries in the lower page */ 2078 new_idt = (struct gate_descriptor*)(tmp + PAGE_SIZE - (7*8)); 2079 bcopy(idt, new_idt, sizeof(idt0)); 2080 r_idt.rd_base = (int)new_idt; 2081 lidt(&r_idt); 2082 idt = new_idt; 2083 if (vm_map_protect(kernel_map, tmp, tmp + PAGE_SIZE, 2084 VM_PROT_READ, FALSE) != KERN_SUCCESS) 2085 panic("vm_map_protect failed"); 2086 return; 2087} 2088#endif /* defined(I586_CPU) && !NO_F00F_HACK */ 2089 2090int 2091ptrace_set_pc(p, addr) 2092 struct proc *p; 2093 unsigned long addr; 2094{ 2095 p->p_md.md_regs->tf_eip = addr; 2096 return (0); 2097} 2098 2099int 2100ptrace_single_step(p) 2101 struct proc *p; 2102{ 2103 p->p_md.md_regs->tf_eflags |= PSL_T; 2104 return (0); 2105} 2106 2107int ptrace_read_u_check(p, addr, len) 2108 struct proc *p; 2109 vm_offset_t addr; 2110 size_t len; 2111{ 2112 vm_offset_t gap; 2113 2114 if ((vm_offset_t) (addr + len) < addr) 2115 return EPERM; 2116 if ((vm_offset_t) (addr + len) <= sizeof(struct user)) 2117 return 0; 2118 2119 gap = (char *) p->p_md.md_regs - (char *) p->p_addr; 2120 2121 if ((vm_offset_t) addr < gap) 2122 return EPERM; 2123 if ((vm_offset_t) (addr + len) <= 2124 (vm_offset_t) (gap + sizeof(struct trapframe))) 2125 return 0; 2126 return EPERM; 2127} 2128 2129int ptrace_write_u(p, off, data) 2130 struct proc *p; 2131 vm_offset_t off; 2132 long data; 2133{ 2134 struct trapframe frame_copy; 2135 vm_offset_t min; 2136 struct trapframe *tp; 2137 2138 /* 2139 * Privileged kernel state is scattered all over the user area. 2140 * Only allow write access to parts of regs and to fpregs. 2141 */ 2142 min = (char *)p->p_md.md_regs - (char *)p->p_addr; 2143 if (off >= min && off <= min + sizeof(struct trapframe) - sizeof(int)) { 2144 tp = p->p_md.md_regs; 2145 frame_copy = *tp; 2146 *(int *)((char *)&frame_copy + (off - min)) = data; 2147 if (!EFL_SECURE(frame_copy.tf_eflags, tp->tf_eflags) || 2148 !CS_SECURE(frame_copy.tf_cs)) 2149 return (EINVAL); 2150 *(int*)((char *)p->p_addr + off) = data; 2151 return (0); 2152 } 2153 min = offsetof(struct user, u_pcb) + offsetof(struct pcb, pcb_savefpu); 2154 if (off >= min && off <= min + sizeof(struct save87) - sizeof(int)) { 2155 *(int*)((char *)p->p_addr + off) = data; 2156 return (0); 2157 } 2158 return (EFAULT); 2159} 2160 2161int 2162fill_regs(p, regs) 2163 struct proc *p; 2164 struct reg *regs; 2165{ 2166 struct pcb *pcb; 2167 struct trapframe *tp; 2168 2169 tp = p->p_md.md_regs; 2170 regs->r_fs = tp->tf_fs; 2171 regs->r_es = tp->tf_es; 2172 regs->r_ds = tp->tf_ds; 2173 regs->r_edi = tp->tf_edi; 2174 regs->r_esi = tp->tf_esi; 2175 regs->r_ebp = tp->tf_ebp; 2176 regs->r_ebx = tp->tf_ebx; 2177 regs->r_edx = tp->tf_edx; 2178 regs->r_ecx = tp->tf_ecx; 2179 regs->r_eax = tp->tf_eax; 2180 regs->r_eip = tp->tf_eip; 2181 regs->r_cs = tp->tf_cs; 2182 regs->r_eflags = tp->tf_eflags; 2183 regs->r_esp = tp->tf_esp; 2184 regs->r_ss = tp->tf_ss; 2185 pcb = &p->p_addr->u_pcb; 2186 regs->r_gs = pcb->pcb_gs; 2187 return (0); 2188} 2189 2190int 2191set_regs(p, regs) 2192 struct proc *p; 2193 struct reg *regs; 2194{ 2195 struct pcb *pcb; 2196 struct trapframe *tp; 2197 2198 tp = p->p_md.md_regs; 2199 if (!EFL_SECURE(regs->r_eflags, tp->tf_eflags) || 2200 !CS_SECURE(regs->r_cs)) 2201 return (EINVAL); 2202 tp->tf_fs = regs->r_fs; 2203 tp->tf_es = regs->r_es; 2204 tp->tf_ds = regs->r_ds; 2205 tp->tf_edi = regs->r_edi; 2206 tp->tf_esi = regs->r_esi; 2207 tp->tf_ebp = regs->r_ebp; 2208 tp->tf_ebx = regs->r_ebx; 2209 tp->tf_edx = regs->r_edx; 2210 tp->tf_ecx = regs->r_ecx; 2211 tp->tf_eax = regs->r_eax; 2212 tp->tf_eip = regs->r_eip; 2213 tp->tf_cs = regs->r_cs; 2214 tp->tf_eflags = regs->r_eflags; 2215 tp->tf_esp = regs->r_esp; 2216 tp->tf_ss = regs->r_ss; 2217 pcb = &p->p_addr->u_pcb; 2218 pcb->pcb_gs = regs->r_gs; 2219 return (0); 2220} 2221 2222int 2223fill_fpregs(p, fpregs) 2224 struct proc *p; 2225 struct fpreg *fpregs; 2226{ 2227 bcopy(&p->p_addr->u_pcb.pcb_savefpu, fpregs, sizeof *fpregs); 2228 return (0); 2229} 2230 2231int 2232set_fpregs(p, fpregs) 2233 struct proc *p; 2234 struct fpreg *fpregs; 2235{ 2236 bcopy(fpregs, &p->p_addr->u_pcb.pcb_savefpu, sizeof *fpregs); 2237 return (0); 2238} 2239 2240int 2241fill_dbregs(p, dbregs) 2242 struct proc *p; 2243 struct dbreg *dbregs; 2244{ 2245 struct pcb *pcb; 2246 2247 pcb = &p->p_addr->u_pcb; 2248 dbregs->dr0 = pcb->pcb_dr0; 2249 dbregs->dr1 = pcb->pcb_dr1; 2250 dbregs->dr2 = pcb->pcb_dr2; 2251 dbregs->dr3 = pcb->pcb_dr3; 2252 dbregs->dr4 = 0; 2253 dbregs->dr5 = 0; 2254 dbregs->dr6 = pcb->pcb_dr6; 2255 dbregs->dr7 = pcb->pcb_dr7; 2256 return (0); 2257} 2258 2259int 2260set_dbregs(p, dbregs) 2261 struct proc *p; 2262 struct dbreg *dbregs; 2263{ 2264 struct pcb *pcb; 2265 int i; 2266 u_int32_t mask1, mask2; 2267 2268 /* 2269 * Don't let an illegal value for dr7 get set. Specifically, 2270 * check for undefined settings. Setting these bit patterns 2271 * result in undefined behaviour and can lead to an unexpected 2272 * TRCTRAP. 2273 */ 2274 for (i = 0, mask1 = 0x3<<16, mask2 = 0x2<<16; i < 8; 2275 i++, mask1 <<= 2, mask2 <<= 2) 2276 if ((dbregs->dr7 & mask1) == mask2) 2277 return (EINVAL); 2278 2279 if (dbregs->dr7 & 0x0000fc00) 2280 return (EINVAL); 2281 2282 2283 2284 pcb = &p->p_addr->u_pcb; 2285 2286 /* 2287 * Don't let a process set a breakpoint that is not within the 2288 * process's address space. If a process could do this, it 2289 * could halt the system by setting a breakpoint in the kernel 2290 * (if ddb was enabled). Thus, we need to check to make sure 2291 * that no breakpoints are being enabled for addresses outside 2292 * process's address space, unless, perhaps, we were called by 2293 * uid 0. 2294 * 2295 * XXX - what about when the watched area of the user's 2296 * address space is written into from within the kernel 2297 * ... wouldn't that still cause a breakpoint to be generated 2298 * from within kernel mode? 2299 */ 2300 2301 if (suser(p) != 0) { 2302 if (dbregs->dr7 & 0x3) { 2303 /* dr0 is enabled */ 2304 if (dbregs->dr0 >= VM_MAXUSER_ADDRESS) 2305 return (EINVAL); 2306 } 2307 2308 if (dbregs->dr7 & (0x3<<2)) { 2309 /* dr1 is enabled */ 2310 if (dbregs->dr1 >= VM_MAXUSER_ADDRESS) 2311 return (EINVAL); 2312 } 2313 2314 if (dbregs->dr7 & (0x3<<4)) { 2315 /* dr2 is enabled */ 2316 if (dbregs->dr2 >= VM_MAXUSER_ADDRESS) 2317 return (EINVAL); 2318 } 2319 2320 if (dbregs->dr7 & (0x3<<6)) { 2321 /* dr3 is enabled */ 2322 if (dbregs->dr3 >= VM_MAXUSER_ADDRESS) 2323 return (EINVAL); 2324 } 2325 } 2326 2327 pcb->pcb_dr0 = dbregs->dr0; 2328 pcb->pcb_dr1 = dbregs->dr1; 2329 pcb->pcb_dr2 = dbregs->dr2; 2330 pcb->pcb_dr3 = dbregs->dr3; 2331 pcb->pcb_dr6 = dbregs->dr6; 2332 pcb->pcb_dr7 = dbregs->dr7; 2333 2334 pcb->pcb_flags |= PCB_DBREGS; 2335 2336 return (0); 2337} 2338 2339/* 2340 * Return > 0 if a hardware breakpoint has been hit, and the 2341 * breakpoint was in user space. Return 0, otherwise. 2342 */ 2343int 2344user_dbreg_trap(void) 2345{ 2346 u_int32_t dr7, dr6; /* debug registers dr6 and dr7 */ 2347 u_int32_t bp; /* breakpoint bits extracted from dr6 */ 2348 int nbp; /* number of breakpoints that triggered */ 2349 caddr_t addr[4]; /* breakpoint addresses */ 2350 int i; 2351 2352 dr7 = rdr7(); 2353 if ((dr7 & 0x000000ff) == 0) { 2354 /* 2355 * all GE and LE bits in the dr7 register are zero, 2356 * thus the trap couldn't have been caused by the 2357 * hardware debug registers 2358 */ 2359 return 0; 2360 } 2361 2362 nbp = 0; 2363 dr6 = rdr6(); 2364 bp = dr6 & 0x0000000f; 2365 2366 if (!bp) { 2367 /* 2368 * None of the breakpoint bits are set meaning this 2369 * trap was not caused by any of the debug registers 2370 */ 2371 return 0; 2372 } 2373 2374 /* 2375 * at least one of the breakpoints were hit, check to see 2376 * which ones and if any of them are user space addresses 2377 */ 2378 2379 if (bp & 0x01) { 2380 addr[nbp++] = (caddr_t)rdr0(); 2381 } 2382 if (bp & 0x02) { 2383 addr[nbp++] = (caddr_t)rdr1(); 2384 } 2385 if (bp & 0x04) { 2386 addr[nbp++] = (caddr_t)rdr2(); 2387 } 2388 if (bp & 0x08) { 2389 addr[nbp++] = (caddr_t)rdr3(); 2390 } 2391 2392 for (i=0; i<nbp; i++) { 2393 if (addr[i] < 2394 (caddr_t)VM_MAXUSER_ADDRESS) { 2395 /* 2396 * addr[i] is in user space 2397 */ 2398 return nbp; 2399 } 2400 } 2401 2402 /* 2403 * None of the breakpoints are in user space. 2404 */ 2405 return 0; 2406} 2407 2408 2409#ifndef DDB 2410void 2411Debugger(const char *msg) 2412{ 2413 printf("Debugger(\"%s\") called.\n", msg); 2414} 2415#endif /* no DDB */ 2416 2417#include <sys/disklabel.h> 2418 2419/* 2420 * Determine the size of the transfer, and make sure it is 2421 * within the boundaries of the partition. Adjust transfer 2422 * if needed, and signal errors or early completion. 2423 */ 2424int 2425bounds_check_with_label(struct bio *bp, struct disklabel *lp, int wlabel) 2426{ 2427 struct partition *p = lp->d_partitions + dkpart(bp->bio_dev); 2428 int labelsect = lp->d_partitions[0].p_offset; 2429 int maxsz = p->p_size, 2430 sz = (bp->bio_bcount + DEV_BSIZE - 1) >> DEV_BSHIFT; 2431 2432 /* overwriting disk label ? */ 2433 /* XXX should also protect bootstrap in first 8K */ 2434 if (bp->bio_blkno + p->p_offset <= LABELSECTOR + labelsect && 2435#if LABELSECTOR != 0 2436 bp->bio_blkno + p->p_offset + sz > LABELSECTOR + labelsect && 2437#endif 2438 (bp->bio_cmd == BIO_WRITE) && wlabel == 0) { 2439 bp->bio_error = EROFS; 2440 goto bad; 2441 } 2442 2443#if defined(DOSBBSECTOR) && defined(notyet) 2444 /* overwriting master boot record? */ 2445 if (bp->bio_blkno + p->p_offset <= DOSBBSECTOR && 2446 (bp->bio_cmd == BIO_WRITE) && wlabel == 0) { 2447 bp->bio_error = EROFS; 2448 goto bad; 2449 } 2450#endif 2451 2452 /* beyond partition? */ 2453 if (bp->bio_blkno < 0 || bp->bio_blkno + sz > maxsz) { 2454 /* if exactly at end of disk, return an EOF */ 2455 if (bp->bio_blkno == maxsz) { 2456 bp->bio_resid = bp->bio_bcount; 2457 return(0); 2458 } 2459 /* or truncate if part of it fits */ 2460 sz = maxsz - bp->bio_blkno; 2461 if (sz <= 0) { 2462 bp->bio_error = EINVAL; 2463 goto bad; 2464 } 2465 bp->bio_bcount = sz << DEV_BSHIFT; 2466 } 2467 2468 bp->bio_pblkno = bp->bio_blkno + p->p_offset; 2469 return(1); 2470 2471bad: 2472 bp->bio_flags |= BIO_ERROR; 2473 return(-1); 2474} 2475 2476#ifdef DDB 2477 2478/* 2479 * Provide inb() and outb() as functions. They are normally only 2480 * available as macros calling inlined functions, thus cannot be 2481 * called inside DDB. 2482 * 2483 * The actual code is stolen from <machine/cpufunc.h>, and de-inlined. 2484 */ 2485 2486#undef inb 2487#undef outb 2488 2489/* silence compiler warnings */ 2490u_char inb(u_int); 2491void outb(u_int, u_char); 2492 2493u_char 2494inb(u_int port) 2495{ 2496 u_char data; 2497 /* 2498 * We use %%dx and not %1 here because i/o is done at %dx and not at 2499 * %edx, while gcc generates inferior code (movw instead of movl) 2500 * if we tell it to load (u_short) port. 2501 */ 2502 __asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port)); 2503 return (data); 2504} 2505 2506void 2507outb(u_int port, u_char data) 2508{ 2509 u_char al; 2510 /* 2511 * Use an unnecessary assignment to help gcc's register allocator. 2512 * This make a large difference for gcc-1.40 and a tiny difference 2513 * for gcc-2.6.0. For gcc-1.40, al had to be ``asm("ax")'' for 2514 * best results. gcc-2.6.0 can't handle this. 2515 */ 2516 al = data; 2517 __asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port)); 2518} 2519 2520#endif /* DDB */ 2521