machdep.c revision 51792
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 51792 1999-09-29 15:06:27Z marcel $ 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 57#include <sys/param.h> 58#include <sys/systm.h> 59#include <sys/sysproto.h> 60#include <sys/signalvar.h> 61#include <sys/kernel.h> 62#include <sys/linker.h> 63#include <sys/proc.h> 64#include <sys/buf.h> 65#include <sys/reboot.h> 66#include <sys/callout.h> 67#include <sys/malloc.h> 68#include <sys/mbuf.h> 69#include <sys/msgbuf.h> 70#include <sys/sysent.h> 71#include <sys/sysctl.h> 72#include <sys/vmmeter.h> 73#include <sys/bus.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#include <sys/cons.h> 101 102#include <ddb/ddb.h> 103 104#include <net/netisr.h> 105 106#include <machine/cpu.h> 107#include <machine/reg.h> 108#include <machine/clock.h> 109#include <machine/specialreg.h> 110#include <machine/bootinfo.h> 111#include <machine/ipl.h> 112#include <machine/md_var.h> 113#include <machine/pcb_ext.h> /* pcb.h included via sys/user.h */ 114#ifdef SMP 115#include <machine/smp.h> 116#include <machine/globaldata.h> 117#endif 118#ifdef PERFMON 119#include <machine/perfmon.h> 120#endif 121 122#ifdef OLD_BUS_ARCH 123#include <i386/isa/isa_device.h> 124#endif 125#include <i386/isa/intr_machdep.h> 126#include <isa/rtc.h> 127#include <machine/vm86.h> 128#include <machine/random.h> 129#include <sys/ptrace.h> 130#include <machine/sigframe.h> 131 132extern void init386 __P((int first)); 133extern void dblfault_handler __P((void)); 134 135extern void printcpuinfo(void); /* XXX header file */ 136extern void earlysetcpuclass(void); /* same header file */ 137extern void finishidentcpu(void); 138extern void panicifcpuunsupported(void); 139extern void initializecpu(void); 140 141static void cpu_startup __P((void *)); 142SYSINIT(cpu, SI_SUB_CPU, SI_ORDER_FIRST, cpu_startup, NULL) 143 144static MALLOC_DEFINE(M_MBUF, "mbuf", "mbuf"); 145 146int _udatasel, _ucodesel; 147u_int atdevbase; 148 149#if defined(SWTCH_OPTIM_STATS) 150extern int swtch_optim_stats; 151SYSCTL_INT(_debug, OID_AUTO, swtch_optim_stats, 152 CTLFLAG_RD, &swtch_optim_stats, 0, ""); 153SYSCTL_INT(_debug, OID_AUTO, tlb_flush_count, 154 CTLFLAG_RD, &tlb_flush_count, 0, ""); 155#endif 156 157#ifdef PC98 158static int ispc98 = 1; 159#else 160static int ispc98 = 0; 161#endif 162SYSCTL_INT(_machdep, OID_AUTO, ispc98, CTLFLAG_RD, &ispc98, 0, ""); 163 164int physmem = 0; 165int cold = 1; 166 167static int 168sysctl_hw_physmem SYSCTL_HANDLER_ARGS 169{ 170 int error = sysctl_handle_int(oidp, 0, ctob(physmem), req); 171 return (error); 172} 173 174SYSCTL_PROC(_hw, HW_PHYSMEM, physmem, CTLTYPE_INT|CTLFLAG_RD, 175 0, 0, sysctl_hw_physmem, "I", ""); 176 177static int 178sysctl_hw_usermem SYSCTL_HANDLER_ARGS 179{ 180 int error = sysctl_handle_int(oidp, 0, 181 ctob(physmem - cnt.v_wire_count), req); 182 return (error); 183} 184 185SYSCTL_PROC(_hw, HW_USERMEM, usermem, CTLTYPE_INT|CTLFLAG_RD, 186 0, 0, sysctl_hw_usermem, "I", ""); 187 188static int 189sysctl_hw_availpages SYSCTL_HANDLER_ARGS 190{ 191 int error = sysctl_handle_int(oidp, 0, 192 i386_btop(avail_end - avail_start), req); 193 return (error); 194} 195 196SYSCTL_PROC(_hw, OID_AUTO, availpages, CTLTYPE_INT|CTLFLAG_RD, 197 0, 0, sysctl_hw_availpages, "I", ""); 198 199static int 200sysctl_machdep_msgbuf SYSCTL_HANDLER_ARGS 201{ 202 int error; 203 204 /* Unwind the buffer, so that it's linear (possibly starting with 205 * some initial nulls). 206 */ 207 error=sysctl_handle_opaque(oidp,msgbufp->msg_ptr+msgbufp->msg_bufr, 208 msgbufp->msg_size-msgbufp->msg_bufr,req); 209 if(error) return(error); 210 if(msgbufp->msg_bufr>0) { 211 error=sysctl_handle_opaque(oidp,msgbufp->msg_ptr, 212 msgbufp->msg_bufr,req); 213 } 214 return(error); 215} 216 217SYSCTL_PROC(_machdep, OID_AUTO, msgbuf, CTLTYPE_STRING|CTLFLAG_RD, 218 0, 0, sysctl_machdep_msgbuf, "A","Contents of kernel message buffer"); 219 220static int msgbuf_clear; 221 222static int 223sysctl_machdep_msgbuf_clear SYSCTL_HANDLER_ARGS 224{ 225 int error; 226 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, 227 req); 228 if (!error && req->newptr) { 229 /* Clear the buffer and reset write pointer */ 230 bzero(msgbufp->msg_ptr,msgbufp->msg_size); 231 msgbufp->msg_bufr=msgbufp->msg_bufx=0; 232 msgbuf_clear=0; 233 } 234 return (error); 235} 236 237SYSCTL_PROC(_machdep, OID_AUTO, msgbuf_clear, CTLTYPE_INT|CTLFLAG_RW, 238 &msgbuf_clear, 0, sysctl_machdep_msgbuf_clear, "I", 239 "Clear kernel message buffer"); 240 241int bootverbose = 0, Maxmem = 0; 242long dumplo; 243 244vm_offset_t phys_avail[10]; 245 246/* must be 2 less so 0 0 can signal end of chunks */ 247#define PHYS_AVAIL_ARRAY_END ((sizeof(phys_avail) / sizeof(vm_offset_t)) - 2) 248 249static vm_offset_t buffer_sva, buffer_eva; 250vm_offset_t clean_sva, clean_eva; 251static vm_offset_t pager_sva, pager_eva; 252 253#define offsetof(type, member) ((size_t)(&((type *)0)->member)) 254 255static void 256cpu_startup(dummy) 257 void *dummy; 258{ 259 register unsigned i; 260 register caddr_t v; 261 vm_offset_t maxaddr; 262 vm_size_t size = 0; 263 int firstaddr; 264 vm_offset_t minaddr; 265 266 if (boothowto & RB_VERBOSE) 267 bootverbose++; 268 269 /* 270 * Good {morning,afternoon,evening,night}. 271 */ 272 printf(version); 273 earlysetcpuclass(); 274 startrtclock(); 275 printcpuinfo(); 276 panicifcpuunsupported(); 277#ifdef PERFMON 278 perfmon_init(); 279#endif 280 printf("real memory = %u (%uK bytes)\n", ptoa(Maxmem), ptoa(Maxmem) / 1024); 281 /* 282 * Display any holes after the first chunk of extended memory. 283 */ 284 if (bootverbose) { 285 int indx; 286 287 printf("Physical memory chunk(s):\n"); 288 for (indx = 0; phys_avail[indx + 1] != 0; indx += 2) { 289 int size1 = phys_avail[indx + 1] - phys_avail[indx]; 290 291 printf("0x%08x - 0x%08x, %u bytes (%u pages)\n", 292 phys_avail[indx], phys_avail[indx + 1] - 1, size1, 293 size1 / PAGE_SIZE); 294 } 295 } 296 297 /* 298 * Calculate callout wheel size 299 */ 300 for (callwheelsize = 1, callwheelbits = 0; 301 callwheelsize < ncallout; 302 callwheelsize <<= 1, ++callwheelbits) 303 ; 304 callwheelmask = callwheelsize - 1; 305 306 /* 307 * Allocate space for system data structures. 308 * The first available kernel virtual address is in "v". 309 * As pages of kernel virtual memory are allocated, "v" is incremented. 310 * As pages of memory are allocated and cleared, 311 * "firstaddr" is incremented. 312 * An index into the kernel page table corresponding to the 313 * virtual memory address maintained in "v" is kept in "mapaddr". 314 */ 315 316 /* 317 * Make two passes. The first pass calculates how much memory is 318 * needed and allocates it. The second pass assigns virtual 319 * addresses to the various data structures. 320 */ 321 firstaddr = 0; 322again: 323 v = (caddr_t)firstaddr; 324 325#define valloc(name, type, num) \ 326 (name) = (type *)v; v = (caddr_t)((name)+(num)) 327#define valloclim(name, type, num, lim) \ 328 (name) = (type *)v; v = (caddr_t)((lim) = ((name)+(num))) 329 330 valloc(callout, struct callout, ncallout); 331 valloc(callwheel, struct callout_tailq, callwheelsize); 332#ifdef SYSVSHM 333 valloc(shmsegs, struct shmid_ds, shminfo.shmmni); 334#endif 335#ifdef SYSVSEM 336 valloc(sema, struct semid_ds, seminfo.semmni); 337 valloc(sem, struct sem, seminfo.semmns); 338 /* This is pretty disgusting! */ 339 valloc(semu, int, (seminfo.semmnu * seminfo.semusz) / sizeof(int)); 340#endif 341#ifdef SYSVMSG 342 valloc(msgpool, char, msginfo.msgmax); 343 valloc(msgmaps, struct msgmap, msginfo.msgseg); 344 valloc(msghdrs, struct msg, msginfo.msgtql); 345 valloc(msqids, struct msqid_ds, msginfo.msgmni); 346#endif 347 348 if (nbuf == 0) { 349 nbuf = 30; 350 if (physmem > 1024) 351 nbuf += min((physmem - 1024) / 8, 2048); 352 if (physmem > 16384) 353 nbuf += (physmem - 16384) / 20; 354 } 355 nswbuf = max(min(nbuf/4, 256), 16); 356 357 valloc(swbuf, struct buf, nswbuf); 358 valloc(buf, struct buf, nbuf); 359 v = bufhashinit(v); 360 361 /* 362 * End of first pass, size has been calculated so allocate memory 363 */ 364 if (firstaddr == 0) { 365 size = (vm_size_t)(v - firstaddr); 366 firstaddr = (int)kmem_alloc(kernel_map, round_page(size)); 367 if (firstaddr == 0) 368 panic("startup: no room for tables"); 369 goto again; 370 } 371 372 /* 373 * End of second pass, addresses have been assigned 374 */ 375 if ((vm_size_t)(v - firstaddr) != size) 376 panic("startup: table size inconsistency"); 377 378 clean_map = kmem_suballoc(kernel_map, &clean_sva, &clean_eva, 379 (nbuf*BKVASIZE) + (nswbuf*MAXPHYS) + pager_map_size); 380 buffer_map = kmem_suballoc(clean_map, &buffer_sva, &buffer_eva, 381 (nbuf*BKVASIZE)); 382 pager_map = kmem_suballoc(clean_map, &pager_sva, &pager_eva, 383 (nswbuf*MAXPHYS) + pager_map_size); 384 pager_map->system_map = 1; 385 exec_map = kmem_suballoc(kernel_map, &minaddr, &maxaddr, 386 (16*(ARG_MAX+(PAGE_SIZE*3)))); 387 388 /* 389 * Finally, allocate mbuf pool. Since mclrefcnt is an off-size 390 * we use the more space efficient malloc in place of kmem_alloc. 391 */ 392 { 393 vm_offset_t mb_map_size; 394 395 mb_map_size = nmbufs * MSIZE + nmbclusters * MCLBYTES; 396 mb_map_size = roundup2(mb_map_size, max(MCLBYTES, PAGE_SIZE)); 397 mclrefcnt = malloc(mb_map_size / MCLBYTES, M_MBUF, M_NOWAIT); 398 bzero(mclrefcnt, mb_map_size / MCLBYTES); 399 mb_map = kmem_suballoc(kmem_map, (vm_offset_t *)&mbutl, &maxaddr, 400 mb_map_size); 401 mb_map->system_map = 1; 402 } 403 404 /* 405 * Initialize callouts 406 */ 407 SLIST_INIT(&callfree); 408 for (i = 0; i < ncallout; i++) { 409 callout_init(&callout[i]); 410 callout[i].c_flags = CALLOUT_LOCAL_ALLOC; 411 SLIST_INSERT_HEAD(&callfree, &callout[i], c_links.sle); 412 } 413 414 for (i = 0; i < callwheelsize; i++) { 415 TAILQ_INIT(&callwheel[i]); 416 } 417 418#if defined(USERCONFIG) 419 userconfig(); 420 cninit(); /* the preferred console may have changed */ 421#endif 422 423 printf("avail memory = %u (%uK bytes)\n", ptoa(cnt.v_free_count), 424 ptoa(cnt.v_free_count) / 1024); 425 426 /* 427 * Set up buffers, so they can be used to read disk labels. 428 */ 429 bufinit(); 430 vm_pager_bufferinit(); 431 432#ifdef SMP 433 /* 434 * OK, enough kmem_alloc/malloc state should be up, lets get on with it! 435 */ 436 mp_start(); /* fire up the APs and APICs */ 437 mp_announce(); 438#endif /* SMP */ 439} 440 441int 442register_netisr(num, handler) 443 int num; 444 netisr_t *handler; 445{ 446 447 if (num < 0 || num >= (sizeof(netisrs)/sizeof(*netisrs)) ) { 448 printf("register_netisr: bad isr number: %d\n", num); 449 return (EINVAL); 450 } 451 netisrs[num] = handler; 452 return (0); 453} 454 455void 456netisr_sysinit(data) 457 void *data; 458{ 459 const struct netisrtab *nit; 460 461 nit = (const struct netisrtab *)data; 462 register_netisr(nit->nit_num, nit->nit_isr); 463} 464 465/* 466 * Send an interrupt to process. 467 * 468 * Stack is set up to allow sigcode stored 469 * at top to call routine, followed by kcall 470 * to sigreturn routine below. After sigreturn 471 * resets the signal mask, the stack, and the 472 * frame pointer, it returns to the user 473 * specified pc, psl. 474 */ 475static void 476osendsig(sig_t catcher, int sig, sigset_t *mask, u_long code) 477{ 478 register struct proc *p = curproc; 479 register struct trapframe *regs; 480 register struct osigframe *fp; 481 struct osigframe sf; 482 struct sigacts *psp = p->p_sigacts; 483 int oonstack; 484 485 regs = p->p_md.md_regs; 486 oonstack = (psp->ps_sigstk.ss_flags & SS_ONSTACK) ? 1 : 0; 487 488 /* Allocate and validate space for the signal handler context. */ 489 if ((psp->ps_flags & SAS_ALTSTACK) && !oonstack && 490 SIGISMEMBER(psp->ps_sigonstack, sig)) { 491 fp = (struct osigframe *)(psp->ps_sigstk.ss_sp + 492 psp->ps_sigstk.ss_size - sizeof(struct osigframe)); 493 psp->ps_sigstk.ss_flags |= SS_ONSTACK; 494 } 495 else 496 fp = (struct osigframe *)regs->tf_esp - 1; 497 498 /* 499 * grow() will return FALSE if the fp will not fit inside the stack 500 * and the stack can not be grown. useracc will return FALSE 501 * if access is denied. 502 */ 503 if (grow_stack(p, (int)fp) == FALSE || 504 useracc((caddr_t)fp, sizeof(struct osigframe), B_WRITE) == FALSE) { 505 /* 506 * Process has trashed its stack; give it an illegal 507 * instruction to halt it in its tracks. 508 */ 509 SIGACTION(p, SIGILL) = SIG_DFL; 510 SIGDELSET(p->p_sigignore, SIGILL); 511 SIGDELSET(p->p_sigcatch, SIGILL); 512 SIGDELSET(p->p_sigmask, SIGILL); 513 psignal(p, SIGILL); 514 return; 515 } 516 517 /* Translate the signal if appropriate */ 518 if (p->p_sysent->sv_sigtbl) { 519 if (sig <= p->p_sysent->sv_sigsize) 520 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)]; 521 } 522 523 /* Build the argument list for the signal handler. */ 524 sf.sf_signum = sig; 525 sf.sf_scp = (register_t)&fp->sf_siginfo.si_sc; 526 if (SIGISMEMBER(p->p_sigacts->ps_siginfo, sig)) { 527 /* Signal handler installed with SA_SIGINFO. */ 528 sf.sf_arg2 = (register_t)&fp->sf_siginfo; 529 sf.sf_siginfo.si_signo = sig; 530 sf.sf_siginfo.si_code = code; 531 sf.sf_ahu.sf_action = (__osiginfohandler_t *)catcher; 532 } 533 else { 534 /* Old FreeBSD-style arguments. */ 535 sf.sf_arg2 = code; 536 sf.sf_ahu.sf_handler = catcher; 537 } 538 539 sf.sf_addr = (char *) regs->tf_err; 540 541 /* save scratch registers */ 542 sf.sf_siginfo.si_sc.sc_eax = regs->tf_eax; 543 sf.sf_siginfo.si_sc.sc_ebx = regs->tf_ebx; 544 sf.sf_siginfo.si_sc.sc_ecx = regs->tf_ecx; 545 sf.sf_siginfo.si_sc.sc_edx = regs->tf_edx; 546 sf.sf_siginfo.si_sc.sc_esi = regs->tf_esi; 547 sf.sf_siginfo.si_sc.sc_edi = regs->tf_edi; 548 sf.sf_siginfo.si_sc.sc_cs = regs->tf_cs; 549 sf.sf_siginfo.si_sc.sc_ds = regs->tf_ds; 550 sf.sf_siginfo.si_sc.sc_ss = regs->tf_ss; 551 sf.sf_siginfo.si_sc.sc_es = regs->tf_es; 552 sf.sf_siginfo.si_sc.sc_fs = regs->tf_fs; 553 sf.sf_siginfo.si_sc.sc_gs = rgs(); 554 sf.sf_siginfo.si_sc.sc_isp = regs->tf_isp; 555 556 /* Build the signal context to be used by sigreturn. */ 557 sf.sf_siginfo.si_sc.sc_onstack = oonstack; 558 SIG2OSIG(*mask, sf.sf_siginfo.si_sc.sc_mask); 559 sf.sf_siginfo.si_sc.sc_sp = regs->tf_esp; 560 sf.sf_siginfo.si_sc.sc_fp = regs->tf_ebp; 561 sf.sf_siginfo.si_sc.sc_pc = regs->tf_eip; 562 sf.sf_siginfo.si_sc.sc_ps = regs->tf_eflags; 563 sf.sf_siginfo.si_sc.sc_trapno = regs->tf_trapno; 564 sf.sf_siginfo.si_sc.sc_err = regs->tf_err; 565 566 /* 567 * If we're a vm86 process, we want to save the segment registers. 568 * We also change eflags to be our emulated eflags, not the actual 569 * eflags. 570 */ 571 if (regs->tf_eflags & PSL_VM) { 572 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs; 573 struct vm86_kernel *vm86 = &p->p_addr->u_pcb.pcb_ext->ext_vm86; 574 575 sf.sf_siginfo.si_sc.sc_gs = tf->tf_vm86_gs; 576 sf.sf_siginfo.si_sc.sc_fs = tf->tf_vm86_fs; 577 sf.sf_siginfo.si_sc.sc_es = tf->tf_vm86_es; 578 sf.sf_siginfo.si_sc.sc_ds = tf->tf_vm86_ds; 579 580 if (vm86->vm86_has_vme == 0) 581 sf.sf_siginfo.si_sc.sc_ps = 582 (tf->tf_eflags & ~(PSL_VIF | PSL_VIP)) 583 | (vm86->vm86_eflags & (PSL_VIF | PSL_VIP)); 584 /* see sendsig for comment */ 585 tf->tf_eflags &= ~(PSL_VM|PSL_NT|PSL_T|PSL_VIF|PSL_VIP); 586 } 587 588 /* Copy the sigframe out to the user's stack. */ 589 if (copyout(&sf, fp, sizeof(struct osigframe)) != 0) { 590 /* 591 * Something is wrong with the stack pointer. 592 * ...Kill the process. 593 */ 594 sigexit(p, SIGILL); 595 } 596 597 regs->tf_esp = (int)fp; 598 regs->tf_eip = PS_STRINGS - *(p->p_sysent->sv_szsigcode); 599 regs->tf_cs = _ucodesel; 600 regs->tf_ds = _udatasel; 601 regs->tf_es = _udatasel; 602 regs->tf_fs = _udatasel; 603 regs->tf_ss = _udatasel; 604} 605 606void 607sendsig(catcher, sig, mask, code) 608 sig_t catcher; 609 int sig; 610 sigset_t *mask; 611 u_long code; 612{ 613 struct proc *p; 614 struct trapframe *regs; 615 struct sigacts *psp; 616 struct sigframe sf, *sfp; 617 618 p = curproc; 619 620 if ((p->p_flag & P_NEWSIGSET) == 0) { 621 osendsig(catcher, sig, mask, code); 622 return; 623 } 624 625 regs = p->p_md.md_regs; 626 psp = p->p_sigacts; 627 628 /* save user context */ 629 bzero(&sf, sizeof(struct sigframe)); 630 sf.sf_uc.uc_sigmask = *mask; 631 sf.sf_uc.uc_stack = psp->ps_sigstk; 632 sf.sf_uc.uc_mcontext.mc_tf = *regs; 633 sf.sf_uc.uc_mcontext.mc_gs = rgs(); 634 635 /* Allocate and validate space for the signal handler context. */ 636 if ((psp->ps_flags & SAS_ALTSTACK) != 0 && 637 (psp->ps_sigstk.ss_flags & SS_ONSTACK) == 0 && 638 SIGISMEMBER(psp->ps_sigonstack, sig)) { 639 sfp = (struct sigframe *)(psp->ps_sigstk.ss_sp + 640 psp->ps_sigstk.ss_size - sizeof(struct sigframe)); 641 psp->ps_sigstk.ss_flags |= SS_ONSTACK; 642 } 643 else 644 sfp = (struct sigframe *)regs->tf_esp - 1; 645 646 /* 647 * grow() will return FALSE if the sfp will not fit inside the stack 648 * and the stack can not be grown. useracc will return FALSE if 649 * access is denied. 650 */ 651 if (grow_stack(p, (int)sfp) == FALSE || 652 useracc((caddr_t)sfp, sizeof(struct sigframe), B_WRITE) == FALSE) { 653 /* 654 * Process has trashed its stack; give it an illegal 655 * instruction to halt it in its tracks. 656 */ 657#ifdef DEBUG 658 printf("process %d has trashed its stack\n", p->p_pid); 659#endif 660 SIGACTION(p, SIGILL) = SIG_DFL; 661 SIGDELSET(p->p_sigignore, SIGILL); 662 SIGDELSET(p->p_sigcatch, SIGILL); 663 SIGDELSET(p->p_sigmask, SIGILL); 664 psignal(p, SIGILL); 665 return; 666 } 667 668 /* Translate the signal is appropriate */ 669 if (p->p_sysent->sv_sigtbl) { 670 if (sig <= p->p_sysent->sv_sigsize) 671 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)]; 672 } 673 674 /* Build the argument list for the signal handler. */ 675 sf.sf_signum = sig; 676 sf.sf_ucontext = (register_t)&sfp->sf_uc; 677 if (SIGISMEMBER(p->p_sigacts->ps_siginfo, sig)) { 678 /* Signal handler installed with SA_SIGINFO. */ 679 sf.sf_siginfo = (register_t)&sfp->sf_si; 680 sf.sf_ahu.sf_action = (__siginfohandler_t *)catcher; 681 682 /* fill siginfo structure */ 683 sf.sf_si.si_signo = sig; 684 sf.sf_si.si_code = code; 685 } 686 else { 687 /* Old FreeBSD-style arguments. */ 688 sf.sf_siginfo = code; 689 sf.sf_ahu.sf_handler = catcher; 690 } 691 692 /* 693 * If we're a vm86 process, we want to save the segment registers. 694 * We also change eflags to be our emulated eflags, not the actual 695 * eflags. 696 */ 697 if (regs->tf_eflags & PSL_VM) { 698 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs; 699 struct vm86_kernel *vm86 = &p->p_addr->u_pcb.pcb_ext->ext_vm86; 700 701 sf.sf_uc.uc_mcontext.mc_gs = tf->tf_vm86_gs; 702 sf.sf_uc.uc_mcontext.mc_tf.tf_fs = tf->tf_vm86_fs; 703 sf.sf_uc.uc_mcontext.mc_tf.tf_es = tf->tf_vm86_es; 704 sf.sf_uc.uc_mcontext.mc_tf.tf_ds = tf->tf_vm86_ds; 705 706 if (vm86->vm86_has_vme == 0) 707 sf.sf_uc.uc_mcontext.mc_tf.tf_eflags = 708 (tf->tf_eflags & ~(PSL_VIF | PSL_VIP)) | 709 (vm86->vm86_eflags & (PSL_VIF | PSL_VIP)); 710 711 /* 712 * We should never have PSL_T set when returning from vm86 713 * mode. It may be set here if we deliver a signal before 714 * getting to vm86 mode, so turn it off. 715 * 716 * Clear PSL_NT to inhibit T_TSSFLT faults on return from 717 * syscalls made by the signal handler. This just avoids 718 * wasting time for our lazy fixup of such faults. PSL_NT 719 * does nothing in vm86 mode, but vm86 programs can set it 720 * almost legitimately in probes for old cpu types. 721 */ 722 tf->tf_eflags &= ~(PSL_VM|PSL_NT|PSL_T|PSL_VIF|PSL_VIP); 723 } 724 725 sf.sf_sigreturn = 0x0ABCDEF0; 726 727 /* 728 * Copy the sigframe out to the user's stack. 729 */ 730 if (copyout(&sf, sfp, sizeof(struct sigframe)) != 0) { 731 /* 732 * Something is wrong with the stack pointer. 733 * ...Kill the process. 734 */ 735 sigexit(p, SIGILL); 736 } 737 738 regs->tf_esp = (int)sfp; 739 regs->tf_eip = PS_STRINGS - *(p->p_sysent->sv_szsigcode); 740 regs->tf_cs = _ucodesel; 741 regs->tf_ds = _udatasel; 742 regs->tf_es = _udatasel; 743 regs->tf_fs = _udatasel; 744 regs->tf_ss = _udatasel; 745} 746 747/* 748 * System call to cleanup state after a signal 749 * has been taken. Reset signal mask and 750 * stack state from context left by sendsig (above). 751 * Return to previous pc and psl as specified by 752 * context left by sendsig. Check carefully to 753 * make sure that the user has not modified the 754 * state to gain improper privileges. 755 */ 756#define EFL_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) 757#define CS_SECURE(cs) (ISPL(cs) == SEL_UPL) 758 759int 760osigreturn(p, uap) 761 struct proc *p; 762 struct osigreturn_args /* { 763 struct osigcontext *sigcntxp; 764 } */ *uap; 765{ 766 register struct osigcontext *scp; 767 register struct osigframe *fp; 768 register struct trapframe *regs = p->p_md.md_regs; 769 int eflags; 770 771 /* 772 * (XXX old comment) regs->tf_esp points to the return address. 773 * The user scp pointer is above that. 774 * The return address is faked in the signal trampoline code 775 * for consistency. 776 */ 777 scp = uap->sigcntxp; 778 fp = (struct osigframe *) 779 ((caddr_t)scp - offsetof(struct osigframe, sf_siginfo.si_sc)); 780 781 if (useracc((caddr_t)fp, sizeof (struct osigframe), B_WRITE) == 0) 782 return(EFAULT); 783 784 eflags = scp->sc_ps; 785 if (eflags & PSL_VM) { 786 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs; 787 struct vm86_kernel *vm86; 788 789 /* 790 * if pcb_ext == 0 or vm86_inited == 0, the user hasn't 791 * set up the vm86 area, and we can't enter vm86 mode. 792 */ 793 if (p->p_addr->u_pcb.pcb_ext == 0) 794 return (EINVAL); 795 vm86 = &p->p_addr->u_pcb.pcb_ext->ext_vm86; 796 if (vm86->vm86_inited == 0) 797 return (EINVAL); 798 799 /* go back to user mode if both flags are set */ 800 if ((eflags & PSL_VIP) && (eflags & PSL_VIF)) 801 trapsignal(p, SIGBUS, 0); 802 803 if (vm86->vm86_has_vme) { 804 eflags = (tf->tf_eflags & ~VME_USERCHANGE) | 805 (eflags & VME_USERCHANGE) | PSL_VM; 806 } else { 807 vm86->vm86_eflags = eflags; /* save VIF, VIP */ 808 eflags = (tf->tf_eflags & ~VM_USERCHANGE) | (eflags & VM_USERCHANGE) | PSL_VM; 809 } 810 tf->tf_vm86_ds = scp->sc_ds; 811 tf->tf_vm86_es = scp->sc_es; 812 tf->tf_vm86_fs = scp->sc_fs; 813 tf->tf_vm86_gs = scp->sc_gs; 814 tf->tf_ds = _udatasel; 815 tf->tf_es = _udatasel; 816 tf->tf_fs = _udatasel; 817 } else { 818 /* 819 * Don't allow users to change privileged or reserved flags. 820 */ 821 /* 822 * XXX do allow users to change the privileged flag PSL_RF. 823 * The cpu sets PSL_RF in tf_eflags for faults. Debuggers 824 * should sometimes set it there too. tf_eflags is kept in 825 * the signal context during signal handling and there is no 826 * other place to remember it, so the PSL_RF bit may be 827 * corrupted by the signal handler without us knowing. 828 * Corruption of the PSL_RF bit at worst causes one more or 829 * one less debugger trap, so allowing it is fairly harmless. 830 */ 831 if (!EFL_SECURE(eflags & ~PSL_RF, regs->tf_eflags & ~PSL_RF)) { 832 return(EINVAL); 833 } 834 835 /* 836 * Don't allow users to load a valid privileged %cs. Let the 837 * hardware check for invalid selectors, excess privilege in 838 * other selectors, invalid %eip's and invalid %esp's. 839 */ 840 if (!CS_SECURE(scp->sc_cs)) { 841 trapsignal(p, SIGBUS, T_PROTFLT); 842 return(EINVAL); 843 } 844 regs->tf_ds = scp->sc_ds; 845 regs->tf_es = scp->sc_es; 846 regs->tf_fs = scp->sc_fs; 847 } 848 849 /* restore scratch registers */ 850 regs->tf_eax = scp->sc_eax; 851 regs->tf_ebx = scp->sc_ebx; 852 regs->tf_ecx = scp->sc_ecx; 853 regs->tf_edx = scp->sc_edx; 854 regs->tf_esi = scp->sc_esi; 855 regs->tf_edi = scp->sc_edi; 856 regs->tf_cs = scp->sc_cs; 857 regs->tf_ss = scp->sc_ss; 858 regs->tf_isp = scp->sc_isp; 859 860 if (useracc((caddr_t)scp, sizeof (*scp), B_WRITE) == 0) 861 return(EINVAL); 862 863 if (scp->sc_onstack & 01) 864 p->p_sigacts->ps_sigstk.ss_flags |= SS_ONSTACK; 865 else 866 p->p_sigacts->ps_sigstk.ss_flags &= ~SS_ONSTACK; 867 868 OSIG2SIG(scp->sc_mask, p->p_sigmask); 869 SIG_CANTMASK(p->p_sigmask); 870 regs->tf_ebp = scp->sc_fp; 871 regs->tf_esp = scp->sc_sp; 872 regs->tf_eip = scp->sc_pc; 873 regs->tf_eflags = eflags; 874 return(EJUSTRETURN); 875} 876 877int 878sigreturn(p, uap) 879 struct proc *p; 880 struct sigreturn_args /* { 881 ucontext_t *sigcntxp; 882 } */ *uap; 883{ 884 struct trapframe *regs; 885 ucontext_t *ucp; 886 struct sigframe *sfp; 887 int eflags; 888 889 regs = p->p_md.md_regs; 890 ucp = uap->sigcntxp; 891 sfp = (struct sigframe *) 892 ((caddr_t)ucp - offsetof(struct sigframe, sf_uc)); 893 eflags = ucp->uc_mcontext.mc_tf.tf_eflags; 894 895 if (useracc((caddr_t)sfp, sizeof(struct sigframe), B_WRITE) == 0) 896 return(EFAULT); 897 898 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 *regs = ucp->uc_mcontext.mc_tf; 924 tf->tf_vm86_ds = tf->tf_ds; 925 tf->tf_vm86_es = tf->tf_es; 926 tf->tf_vm86_fs = tf->tf_fs; 927 tf->tf_vm86_gs = ucp->uc_mcontext.mc_gs; 928 tf->tf_ds = _udatasel; 929 tf->tf_es = _udatasel; 930 tf->tf_fs = _udatasel; 931 } else { 932 /* 933 * Don't allow users to change privileged or reserved flags. 934 */ 935 /* 936 * XXX do allow users to change the privileged flag PSL_RF. 937 * The cpu sets PSL_RF in tf_eflags for faults. Debuggers 938 * should sometimes set it there too. tf_eflags is kept in 939 * the signal context during signal handling and there is no 940 * other place to remember it, so the PSL_RF bit may be 941 * corrupted by the signal handler without us knowing. 942 * Corruption of the PSL_RF bit at worst causes one more or 943 * one less debugger trap, so allowing it is fairly harmless. 944 */ 945 if (!EFL_SECURE(eflags & ~PSL_RF, regs->tf_eflags & ~PSL_RF)) { 946 printf("sigreturn: eflags = 0x%x\n", eflags); 947 return(EINVAL); 948 } 949 950 *regs = ucp->uc_mcontext.mc_tf; 951 952 /* 953 * Don't allow users to load a valid privileged %cs. Let the 954 * hardware check for invalid selectors, excess privilege in 955 * other selectors, invalid %eip's and invalid %esp's. 956 */ 957 if (!CS_SECURE(regs->tf_cs)) { 958 printf("sigreturn: cs = 0x%x\n", regs->tf_cs); 959 trapsignal(p, SIGBUS, T_PROTFLT); 960 return(EINVAL); 961 } 962 } 963 964 p->p_sigacts->ps_sigstk = ucp->uc_stack; 965 p->p_sigmask = ucp->uc_sigmask; 966 SIG_CANTMASK(p->p_sigmask); 967 return(EJUSTRETURN); 968} 969 970/* 971 * Machine dependent boot() routine 972 * 973 * I haven't seen anything to put here yet 974 * Possibly some stuff might be grafted back here from boot() 975 */ 976void 977cpu_boot(int howto) 978{ 979} 980 981/* 982 * Shutdown the CPU as much as possible 983 */ 984void 985cpu_halt(void) 986{ 987 for (;;) 988 __asm__ ("hlt"); 989} 990 991/* 992 * Clear registers on exec 993 */ 994void 995setregs(p, entry, stack, ps_strings) 996 struct proc *p; 997 u_long entry; 998 u_long stack; 999 u_long ps_strings; 1000{ 1001 struct trapframe *regs = p->p_md.md_regs; 1002 struct pcb *pcb = &p->p_addr->u_pcb; 1003 1004#ifdef USER_LDT 1005 /* was i386_user_cleanup() in NetBSD */ 1006 if (pcb->pcb_ldt) { 1007 if (pcb == curpcb) { 1008 lldt(_default_ldt); 1009 currentldt = _default_ldt; 1010 } 1011 kmem_free(kernel_map, (vm_offset_t)pcb->pcb_ldt, 1012 pcb->pcb_ldt_len * sizeof(union descriptor)); 1013 pcb->pcb_ldt_len = (int)pcb->pcb_ldt = 0; 1014 } 1015#endif 1016 1017 bzero((char *)regs, sizeof(struct trapframe)); 1018 regs->tf_eip = entry; 1019 regs->tf_esp = stack; 1020 regs->tf_eflags = PSL_USER | (regs->tf_eflags & PSL_T); 1021 regs->tf_ss = _udatasel; 1022 regs->tf_ds = _udatasel; 1023 regs->tf_es = _udatasel; 1024 regs->tf_fs = _udatasel; 1025 regs->tf_cs = _ucodesel; 1026 1027 /* PS_STRINGS value for BSD/OS binaries. It is 0 for non-BSD/OS. */ 1028 regs->tf_ebx = ps_strings; 1029 1030 /* reset %gs as well */ 1031 pcb->pcb_gs = _udatasel; 1032 if (pcb == curpcb) { 1033 load_gs(_udatasel); 1034 } 1035 1036 /* 1037 * Initialize the math emulator (if any) for the current process. 1038 * Actually, just clear the bit that says that the emulator has 1039 * been initialized. Initialization is delayed until the process 1040 * traps to the emulator (if it is done at all) mainly because 1041 * emulators don't provide an entry point for initialization. 1042 */ 1043 p->p_addr->u_pcb.pcb_flags &= ~FP_SOFTFP; 1044 1045 /* 1046 * Arrange to trap the next npx or `fwait' instruction (see npx.c 1047 * for why fwait must be trapped at least if there is an npx or an 1048 * emulator). This is mainly to handle the case where npx0 is not 1049 * configured, since the npx routines normally set up the trap 1050 * otherwise. It should be done only at boot time, but doing it 1051 * here allows modifying `npx_exists' for testing the emulator on 1052 * systems with an npx. 1053 */ 1054 load_cr0(rcr0() | CR0_MP | CR0_TS); 1055 1056#if NNPX > 0 1057 /* Initialize the npx (if any) for the current process. */ 1058 npxinit(__INITIAL_NPXCW__); 1059#endif 1060 1061 /* 1062 * XXX - Linux emulator 1063 * Make sure sure edx is 0x0 on entry. Linux binaries depend 1064 * on it. 1065 */ 1066 p->p_retval[1] = 0; 1067} 1068 1069static int 1070sysctl_machdep_adjkerntz SYSCTL_HANDLER_ARGS 1071{ 1072 int error; 1073 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, 1074 req); 1075 if (!error && req->newptr) 1076 resettodr(); 1077 return (error); 1078} 1079 1080SYSCTL_PROC(_machdep, CPU_ADJKERNTZ, adjkerntz, CTLTYPE_INT|CTLFLAG_RW, 1081 &adjkerntz, 0, sysctl_machdep_adjkerntz, "I", ""); 1082 1083SYSCTL_INT(_machdep, CPU_DISRTCSET, disable_rtc_set, 1084 CTLFLAG_RW, &disable_rtc_set, 0, ""); 1085 1086SYSCTL_STRUCT(_machdep, CPU_BOOTINFO, bootinfo, 1087 CTLFLAG_RD, &bootinfo, bootinfo, ""); 1088 1089SYSCTL_INT(_machdep, CPU_WALLCLOCK, wall_cmos_clock, 1090 CTLFLAG_RW, &wall_cmos_clock, 0, ""); 1091 1092/* 1093 * Initialize 386 and configure to run kernel 1094 */ 1095 1096/* 1097 * Initialize segments & interrupt table 1098 */ 1099 1100int _default_ldt; 1101#ifdef SMP 1102union descriptor gdt[NGDT * NCPU]; /* global descriptor table */ 1103#else 1104union descriptor gdt[NGDT]; /* global descriptor table */ 1105#endif 1106static struct gate_descriptor idt0[NIDT]; 1107struct gate_descriptor *idt = &idt0[0]; /* interrupt descriptor table */ 1108union descriptor ldt[NLDT]; /* local descriptor table */ 1109#ifdef SMP 1110/* table descriptors - used to load tables by microp */ 1111struct region_descriptor r_gdt, r_idt; 1112#endif 1113 1114#ifndef SMP 1115extern struct segment_descriptor common_tssd, *tss_gdt; 1116#endif 1117int private_tss; /* flag indicating private tss */ 1118 1119#if defined(I586_CPU) && !defined(NO_F00F_HACK) 1120extern int has_f00f_bug; 1121#endif 1122 1123static struct i386tss dblfault_tss; 1124static char dblfault_stack[PAGE_SIZE]; 1125 1126extern struct user *proc0paddr; 1127 1128 1129/* software prototypes -- in more palatable form */ 1130struct soft_segment_descriptor gdt_segs[] = { 1131/* GNULL_SEL 0 Null Descriptor */ 1132{ 0x0, /* segment base address */ 1133 0x0, /* length */ 1134 0, /* segment type */ 1135 0, /* segment descriptor priority level */ 1136 0, /* segment descriptor present */ 1137 0, 0, 1138 0, /* default 32 vs 16 bit size */ 1139 0 /* limit granularity (byte/page units)*/ }, 1140/* GCODE_SEL 1 Code Descriptor for kernel */ 1141{ 0x0, /* segment base address */ 1142 0xfffff, /* length - all address space */ 1143 SDT_MEMERA, /* segment type */ 1144 0, /* segment descriptor priority level */ 1145 1, /* segment descriptor present */ 1146 0, 0, 1147 1, /* default 32 vs 16 bit size */ 1148 1 /* limit granularity (byte/page units)*/ }, 1149/* GDATA_SEL 2 Data Descriptor for kernel */ 1150{ 0x0, /* segment base address */ 1151 0xfffff, /* length - all address space */ 1152 SDT_MEMRWA, /* segment type */ 1153 0, /* segment descriptor priority level */ 1154 1, /* segment descriptor present */ 1155 0, 0, 1156 1, /* default 32 vs 16 bit size */ 1157 1 /* limit granularity (byte/page units)*/ }, 1158/* GPRIV_SEL 3 SMP Per-Processor Private Data Descriptor */ 1159{ 0x0, /* segment base address */ 1160 0xfffff, /* length - all address space */ 1161 SDT_MEMRWA, /* segment type */ 1162 0, /* segment descriptor priority level */ 1163 1, /* segment descriptor present */ 1164 0, 0, 1165 1, /* default 32 vs 16 bit size */ 1166 1 /* limit granularity (byte/page units)*/ }, 1167/* GPROC0_SEL 4 Proc 0 Tss Descriptor */ 1168{ 1169 0x0, /* segment base address */ 1170 sizeof(struct i386tss)-1,/* length - all address space */ 1171 SDT_SYS386TSS, /* segment type */ 1172 0, /* segment descriptor priority level */ 1173 1, /* segment descriptor present */ 1174 0, 0, 1175 0, /* unused - default 32 vs 16 bit size */ 1176 0 /* limit granularity (byte/page units)*/ }, 1177/* GLDT_SEL 5 LDT Descriptor */ 1178{ (int) ldt, /* segment base address */ 1179 sizeof(ldt)-1, /* length - all address space */ 1180 SDT_SYSLDT, /* segment type */ 1181 SEL_UPL, /* segment descriptor priority level */ 1182 1, /* segment descriptor present */ 1183 0, 0, 1184 0, /* unused - default 32 vs 16 bit size */ 1185 0 /* limit granularity (byte/page units)*/ }, 1186/* GUSERLDT_SEL 6 User LDT Descriptor per process */ 1187{ (int) ldt, /* segment base address */ 1188 (512 * sizeof(union descriptor)-1), /* length */ 1189 SDT_SYSLDT, /* segment type */ 1190 0, /* segment descriptor priority level */ 1191 1, /* segment descriptor present */ 1192 0, 0, 1193 0, /* unused - default 32 vs 16 bit size */ 1194 0 /* limit granularity (byte/page units)*/ }, 1195/* GTGATE_SEL 7 Null Descriptor - Placeholder */ 1196{ 0x0, /* segment base address */ 1197 0x0, /* length - all address space */ 1198 0, /* segment type */ 1199 0, /* segment descriptor priority level */ 1200 0, /* segment descriptor present */ 1201 0, 0, 1202 0, /* default 32 vs 16 bit size */ 1203 0 /* limit granularity (byte/page units)*/ }, 1204/* GBIOSLOWMEM_SEL 8 BIOS access to realmode segment 0x40, must be #8 in GDT */ 1205{ 0x400, /* segment base address */ 1206 0xfffff, /* length */ 1207 SDT_MEMRWA, /* segment type */ 1208 0, /* segment descriptor priority level */ 1209 1, /* segment descriptor present */ 1210 0, 0, 1211 1, /* default 32 vs 16 bit size */ 1212 1 /* limit granularity (byte/page units)*/ }, 1213/* GPANIC_SEL 9 Panic Tss Descriptor */ 1214{ (int) &dblfault_tss, /* segment base address */ 1215 sizeof(struct i386tss)-1,/* length - all address space */ 1216 SDT_SYS386TSS, /* segment type */ 1217 0, /* segment descriptor priority level */ 1218 1, /* segment descriptor present */ 1219 0, 0, 1220 0, /* unused - default 32 vs 16 bit size */ 1221 0 /* limit granularity (byte/page units)*/ }, 1222/* GBIOSCODE32_SEL 10 BIOS 32-bit interface (32bit Code) */ 1223{ 0, /* segment base address (overwritten) */ 1224 0xfffff, /* length */ 1225 SDT_MEMERA, /* segment type */ 1226 0, /* segment descriptor priority level */ 1227 1, /* segment descriptor present */ 1228 0, 0, 1229 0, /* default 32 vs 16 bit size */ 1230 1 /* limit granularity (byte/page units)*/ }, 1231/* GBIOSCODE16_SEL 11 BIOS 32-bit interface (16bit Code) */ 1232{ 0, /* segment base address (overwritten) */ 1233 0xfffff, /* length */ 1234 SDT_MEMERA, /* segment type */ 1235 0, /* segment descriptor priority level */ 1236 1, /* segment descriptor present */ 1237 0, 0, 1238 0, /* default 32 vs 16 bit size */ 1239 1 /* limit granularity (byte/page units)*/ }, 1240/* GBIOSDATA_SEL 12 BIOS 32-bit interface (Data) */ 1241{ 0, /* segment base address (overwritten) */ 1242 0xfffff, /* length */ 1243 SDT_MEMRWA, /* segment type */ 1244 0, /* segment descriptor priority level */ 1245 1, /* segment descriptor present */ 1246 0, 0, 1247 1, /* default 32 vs 16 bit size */ 1248 1 /* limit granularity (byte/page units)*/ }, 1249/* GBIOSUTIL_SEL 13 BIOS 16-bit interface (Utility) */ 1250{ 0, /* segment base address (overwritten) */ 1251 0xfffff, /* length */ 1252 SDT_MEMRWA, /* segment type */ 1253 0, /* segment descriptor priority level */ 1254 1, /* segment descriptor present */ 1255 0, 0, 1256 0, /* default 32 vs 16 bit size */ 1257 1 /* limit granularity (byte/page units)*/ }, 1258/* GBIOSARGS_SEL 14 BIOS 16-bit interface (Arguments) */ 1259{ 0, /* segment base address (overwritten) */ 1260 0xfffff, /* length */ 1261 SDT_MEMRWA, /* segment type */ 1262 0, /* segment descriptor priority level */ 1263 1, /* segment descriptor present */ 1264 0, 0, 1265 0, /* default 32 vs 16 bit size */ 1266 1 /* limit granularity (byte/page units)*/ }, 1267}; 1268 1269static struct soft_segment_descriptor ldt_segs[] = { 1270 /* Null Descriptor - overwritten by call gate */ 1271{ 0x0, /* segment base address */ 1272 0x0, /* length - all address space */ 1273 0, /* segment type */ 1274 0, /* segment descriptor priority level */ 1275 0, /* segment descriptor present */ 1276 0, 0, 1277 0, /* default 32 vs 16 bit size */ 1278 0 /* limit granularity (byte/page units)*/ }, 1279 /* Null Descriptor - overwritten by call gate */ 1280{ 0x0, /* segment base address */ 1281 0x0, /* length - all address space */ 1282 0, /* segment type */ 1283 0, /* segment descriptor priority level */ 1284 0, /* segment descriptor present */ 1285 0, 0, 1286 0, /* default 32 vs 16 bit size */ 1287 0 /* limit granularity (byte/page units)*/ }, 1288 /* Null Descriptor - overwritten by call gate */ 1289{ 0x0, /* segment base address */ 1290 0x0, /* length - all address space */ 1291 0, /* segment type */ 1292 0, /* segment descriptor priority level */ 1293 0, /* segment descriptor present */ 1294 0, 0, 1295 0, /* default 32 vs 16 bit size */ 1296 0 /* limit granularity (byte/page units)*/ }, 1297 /* Code Descriptor for user */ 1298{ 0x0, /* segment base address */ 1299 0xfffff, /* length - all address space */ 1300 SDT_MEMERA, /* segment type */ 1301 SEL_UPL, /* segment descriptor priority level */ 1302 1, /* segment descriptor present */ 1303 0, 0, 1304 1, /* default 32 vs 16 bit size */ 1305 1 /* limit granularity (byte/page units)*/ }, 1306 /* Null Descriptor - overwritten by call gate */ 1307{ 0x0, /* segment base address */ 1308 0x0, /* length - all address space */ 1309 0, /* segment type */ 1310 0, /* segment descriptor priority level */ 1311 0, /* segment descriptor present */ 1312 0, 0, 1313 0, /* default 32 vs 16 bit size */ 1314 0 /* limit granularity (byte/page units)*/ }, 1315 /* Data Descriptor for user */ 1316{ 0x0, /* segment base address */ 1317 0xfffff, /* length - all address space */ 1318 SDT_MEMRWA, /* segment type */ 1319 SEL_UPL, /* segment descriptor priority level */ 1320 1, /* segment descriptor present */ 1321 0, 0, 1322 1, /* default 32 vs 16 bit size */ 1323 1 /* limit granularity (byte/page units)*/ }, 1324}; 1325 1326void 1327setidt(idx, func, typ, dpl, selec) 1328 int idx; 1329 inthand_t *func; 1330 int typ; 1331 int dpl; 1332 int selec; 1333{ 1334 struct gate_descriptor *ip; 1335 1336 ip = idt + idx; 1337 ip->gd_looffset = (int)func; 1338 ip->gd_selector = selec; 1339 ip->gd_stkcpy = 0; 1340 ip->gd_xx = 0; 1341 ip->gd_type = typ; 1342 ip->gd_dpl = dpl; 1343 ip->gd_p = 1; 1344 ip->gd_hioffset = ((int)func)>>16 ; 1345} 1346 1347#define IDTVEC(name) __CONCAT(X,name) 1348 1349extern inthand_t 1350 IDTVEC(div), IDTVEC(dbg), IDTVEC(nmi), IDTVEC(bpt), IDTVEC(ofl), 1351 IDTVEC(bnd), IDTVEC(ill), IDTVEC(dna), IDTVEC(fpusegm), 1352 IDTVEC(tss), IDTVEC(missing), IDTVEC(stk), IDTVEC(prot), 1353 IDTVEC(page), IDTVEC(mchk), IDTVEC(rsvd), IDTVEC(fpu), IDTVEC(align), 1354 IDTVEC(syscall), IDTVEC(int0x80_syscall); 1355 1356void 1357sdtossd(sd, ssd) 1358 struct segment_descriptor *sd; 1359 struct soft_segment_descriptor *ssd; 1360{ 1361 ssd->ssd_base = (sd->sd_hibase << 24) | sd->sd_lobase; 1362 ssd->ssd_limit = (sd->sd_hilimit << 16) | sd->sd_lolimit; 1363 ssd->ssd_type = sd->sd_type; 1364 ssd->ssd_dpl = sd->sd_dpl; 1365 ssd->ssd_p = sd->sd_p; 1366 ssd->ssd_def32 = sd->sd_def32; 1367 ssd->ssd_gran = sd->sd_gran; 1368} 1369 1370#define PHYSMAP_SIZE (2 * 8) 1371 1372/* 1373 * Populate the (physmap) array with base/bound pairs describing the 1374 * available physical memory in the system, then test this memory and 1375 * build the phys_avail array describing the actually-available memory. 1376 * 1377 * If we cannot accurately determine the physical memory map, then use 1378 * value from the 0xE801 call, and failing that, the RTC. 1379 * 1380 * Total memory size may be set by the kernel environment variable 1381 * hw.physmem or the compile-time define MAXMEM. 1382 */ 1383static void 1384getmemsize(int first) 1385{ 1386 int i, physmap_idx, pa_indx; 1387 u_int basemem, extmem; 1388 struct vm86frame vmf; 1389 struct vm86context vmc; 1390 vm_offset_t pa, physmap[PHYSMAP_SIZE]; 1391 pt_entry_t pte; 1392 const char *cp; 1393 struct { 1394 u_int64_t base; 1395 u_int64_t length; 1396 u_int32_t type; 1397 } *smap; 1398 1399 bzero(&vmf, sizeof(struct vm86frame)); 1400 bzero(physmap, sizeof(physmap)); 1401 1402 /* 1403 * Perform "base memory" related probes & setup 1404 */ 1405 vm86_intcall(0x12, &vmf); 1406 basemem = vmf.vmf_ax; 1407 if (basemem > 640) { 1408 printf("Preposterous BIOS basemem of %uK, truncating to 640K\n", 1409 basemem); 1410 basemem = 640; 1411 } 1412 1413 /* 1414 * XXX if biosbasemem is now < 640, there is a `hole' 1415 * between the end of base memory and the start of 1416 * ISA memory. The hole may be empty or it may 1417 * contain BIOS code or data. Map it read/write so 1418 * that the BIOS can write to it. (Memory from 0 to 1419 * the physical end of the kernel is mapped read-only 1420 * to begin with and then parts of it are remapped. 1421 * The parts that aren't remapped form holes that 1422 * remain read-only and are unused by the kernel. 1423 * The base memory area is below the physical end of 1424 * the kernel and right now forms a read-only hole. 1425 * The part of it from PAGE_SIZE to 1426 * (trunc_page(biosbasemem * 1024) - 1) will be 1427 * remapped and used by the kernel later.) 1428 * 1429 * This code is similar to the code used in 1430 * pmap_mapdev, but since no memory needs to be 1431 * allocated we simply change the mapping. 1432 */ 1433 for (pa = trunc_page(basemem * 1024); 1434 pa < ISA_HOLE_START; pa += PAGE_SIZE) { 1435 pte = (pt_entry_t)vtopte(pa + KERNBASE); 1436 *pte = pa | PG_RW | PG_V; 1437 } 1438 1439 /* 1440 * if basemem != 640, map pages r/w into vm86 page table so 1441 * that the bios can scribble on it. 1442 */ 1443 pte = (pt_entry_t)vm86paddr; 1444 for (i = basemem / 4; i < 160; i++) 1445 pte[i] = (i << PAGE_SHIFT) | PG_V | PG_RW | PG_U; 1446 1447 /* 1448 * map page 1 R/W into the kernel page table so we can use it 1449 * as a buffer. The kernel will unmap this page later. 1450 */ 1451 pte = (pt_entry_t)vtopte(KERNBASE + (1 << PAGE_SHIFT)); 1452 *pte = (1 << PAGE_SHIFT) | PG_RW | PG_V; 1453 1454 /* 1455 * get memory map with INT 15:E820 1456 */ 1457#define SMAPSIZ sizeof(*smap) 1458#define SMAP_SIG 0x534D4150 /* 'SMAP' */ 1459 1460 vmc.npages = 0; 1461 smap = (void *)vm86_addpage(&vmc, 1, KERNBASE + (1 << PAGE_SHIFT)); 1462 vm86_getptr(&vmc, (vm_offset_t)smap, &vmf.vmf_es, &vmf.vmf_di); 1463 1464 physmap_idx = 0; 1465 vmf.vmf_ebx = 0; 1466 do { 1467 vmf.vmf_eax = 0xE820; 1468 vmf.vmf_edx = SMAP_SIG; 1469 vmf.vmf_ecx = SMAPSIZ; 1470 i = vm86_datacall(0x15, &vmf, &vmc); 1471 if (i || vmf.vmf_eax != SMAP_SIG) 1472 break; 1473 if (boothowto & RB_VERBOSE) 1474 printf("SMAP type=%02x base=%08x %08x len=%08x %08x\n", 1475 smap->type, 1476 *(u_int32_t *)((char *)&smap->base + 4), 1477 (u_int32_t)smap->base, 1478 *(u_int32_t *)((char *)&smap->length + 4), 1479 (u_int32_t)smap->length); 1480 1481 if (smap->type != 0x01) 1482 goto next_run; 1483 1484 if (smap->length == 0) 1485 goto next_run; 1486 1487 if (smap->base >= 0xffffffff) { 1488 printf("%uK of memory above 4GB ignored\n", 1489 (u_int)(smap->length / 1024)); 1490 goto next_run; 1491 } 1492 1493 for (i = 0; i <= physmap_idx; i += 2) { 1494 if (smap->base < physmap[i + 1]) { 1495 if (boothowto & RB_VERBOSE) 1496 printf( 1497 "Overlapping or non-montonic memory region, ignoring second region\n"); 1498 goto next_run; 1499 } 1500 } 1501 1502 if (smap->base == physmap[physmap_idx + 1]) { 1503 physmap[physmap_idx + 1] += smap->length; 1504 goto next_run; 1505 } 1506 1507 physmap_idx += 2; 1508 if (physmap_idx == PHYSMAP_SIZE) { 1509 printf( 1510 "Too many segments in the physical address map, giving up\n"); 1511 break; 1512 } 1513 physmap[physmap_idx] = smap->base; 1514 physmap[physmap_idx + 1] = smap->base + smap->length; 1515next_run: 1516 } while (vmf.vmf_ebx != 0); 1517 1518 if (physmap[1] != 0) 1519 goto physmap_done; 1520 1521 /* 1522 * If we failed above, try memory map with INT 15:E801 1523 */ 1524 vmf.vmf_ax = 0xE801; 1525 if (vm86_intcall(0x15, &vmf) == 0) { 1526 extmem = vmf.vmf_cx + vmf.vmf_dx * 64; 1527 } else { 1528#if 0 1529 vmf.vmf_ah = 0x88; 1530 vm86_intcall(0x15, &vmf); 1531 extmem = vmf.vmf_ax; 1532#else 1533 /* 1534 * Prefer the RTC value for extended memory. 1535 */ 1536 extmem = rtcin(RTC_EXTLO) + (rtcin(RTC_EXTHI) << 8); 1537#endif 1538 } 1539 1540 /* 1541 * Special hack for chipsets that still remap the 384k hole when 1542 * there's 16MB of memory - this really confuses people that 1543 * are trying to use bus mastering ISA controllers with the 1544 * "16MB limit"; they only have 16MB, but the remapping puts 1545 * them beyond the limit. 1546 * 1547 * If extended memory is between 15-16MB (16-17MB phys address range), 1548 * chop it to 15MB. 1549 */ 1550 if ((extmem > 15 * 1024) && (extmem < 16 * 1024)) 1551 extmem = 15 * 1024; 1552 1553 physmap[0] = 0; 1554 physmap[1] = basemem * 1024; 1555 physmap_idx = 2; 1556 physmap[physmap_idx] = 0x100000; 1557 physmap[physmap_idx + 1] = physmap[physmap_idx] + extmem * 1024; 1558 1559physmap_done: 1560 /* 1561 * Now, physmap contains a map of physical memory. 1562 */ 1563 1564#ifdef SMP 1565 /* make hole for AP bootstrap code */ 1566 physmap[1] = mp_bootaddress(physmap[1] / 1024); 1567 1568 /* look for the MP hardware - needed for apic addresses */ 1569 mp_probe(); 1570#endif 1571 1572 /* 1573 * Maxmem isn't the "maximum memory", it's one larger than the 1574 * highest page of the physical address space. It should be 1575 * called something like "Maxphyspage". We may adjust this 1576 * based on ``hw.physmem'' and the results of the memory test. 1577 */ 1578 Maxmem = atop(physmap[physmap_idx + 1]); 1579 1580#ifdef MAXMEM 1581 Maxmem = MAXMEM / 4; 1582#endif 1583 1584 /* 1585 * hw.maxmem is a size in bytes; we also allow k, m, and g suffixes 1586 * for the appropriate modifiers. This overrides MAXMEM. 1587 */ 1588 if ((cp = getenv("hw.physmem")) != NULL) { 1589 u_int64_t AllowMem, sanity; 1590 const char *ep; 1591 1592 sanity = AllowMem = strtouq(cp, &ep, 0); 1593 if ((ep != cp) && (*ep != 0)) { 1594 switch(*ep) { 1595 case 'g': 1596 case 'G': 1597 AllowMem <<= 10; 1598 case 'm': 1599 case 'M': 1600 AllowMem <<= 10; 1601 case 'k': 1602 case 'K': 1603 AllowMem <<= 10; 1604 break; 1605 default: 1606 AllowMem = sanity = 0; 1607 } 1608 if (AllowMem < sanity) 1609 AllowMem = 0; 1610 } 1611 if (AllowMem == 0) 1612 printf("Ignoring invalid memory size of '%s'\n", cp); 1613 else 1614 Maxmem = atop(AllowMem); 1615 } 1616 1617 if (atop(physmap[physmap_idx + 1]) != Maxmem && 1618 (boothowto & RB_VERBOSE)) 1619 printf("Physical memory use set to %uK\n", Maxmem * 4); 1620 1621 /* 1622 * If Maxmem has been increased beyond what the system has detected, 1623 * extend the last memory segment to the new limit. 1624 */ 1625 if (atop(physmap[physmap_idx + 1]) < Maxmem) 1626 physmap[physmap_idx + 1] = ptoa(Maxmem); 1627 1628 /* call pmap initialization to make new kernel address space */ 1629 pmap_bootstrap(first, 0); 1630 1631 /* 1632 * Size up each available chunk of physical memory. 1633 */ 1634 physmap[0] = PAGE_SIZE; /* mask off page 0 */ 1635 pa_indx = 0; 1636 phys_avail[pa_indx++] = physmap[0]; 1637 phys_avail[pa_indx] = physmap[0]; 1638#if 0 1639 pte = (pt_entry_t)vtopte(KERNBASE); 1640#else 1641 pte = (pt_entry_t)CMAP1; 1642#endif 1643 1644 /* 1645 * physmap is in bytes, so when converting to page boundaries, 1646 * round up the start address and round down the end address. 1647 */ 1648 for (i = 0; i <= physmap_idx; i += 2) { 1649 vm_offset_t end; 1650 1651 end = ptoa(Maxmem); 1652 if (physmap[i + 1] < end) 1653 end = trunc_page(physmap[i + 1]); 1654 for (pa = round_page(physmap[i]); pa < end; pa += PAGE_SIZE) { 1655 int tmp, page_bad; 1656#if 0 1657 int *ptr = 0; 1658#else 1659 int *ptr = (int *)CADDR1; 1660#endif 1661 1662 /* 1663 * block out kernel memory as not available. 1664 */ 1665 if (pa >= 0x100000 && pa < first) 1666 continue; 1667 1668 page_bad = FALSE; 1669 1670 /* 1671 * map page into kernel: valid, read/write,non-cacheable 1672 */ 1673 *pte = pa | PG_V | PG_RW | PG_N; 1674 invltlb(); 1675 1676 tmp = *(int *)ptr; 1677 /* 1678 * Test for alternating 1's and 0's 1679 */ 1680 *(volatile int *)ptr = 0xaaaaaaaa; 1681 if (*(volatile int *)ptr != 0xaaaaaaaa) { 1682 page_bad = TRUE; 1683 } 1684 /* 1685 * Test for alternating 0's and 1's 1686 */ 1687 *(volatile int *)ptr = 0x55555555; 1688 if (*(volatile int *)ptr != 0x55555555) { 1689 page_bad = TRUE; 1690 } 1691 /* 1692 * Test for all 1's 1693 */ 1694 *(volatile int *)ptr = 0xffffffff; 1695 if (*(volatile int *)ptr != 0xffffffff) { 1696 page_bad = TRUE; 1697 } 1698 /* 1699 * Test for all 0's 1700 */ 1701 *(volatile int *)ptr = 0x0; 1702 if (*(volatile int *)ptr != 0x0) { 1703 page_bad = TRUE; 1704 } 1705 /* 1706 * Restore original value. 1707 */ 1708 *(int *)ptr = tmp; 1709 1710 /* 1711 * Adjust array of valid/good pages. 1712 */ 1713 if (page_bad == TRUE) { 1714 continue; 1715 } 1716 /* 1717 * If this good page is a continuation of the 1718 * previous set of good pages, then just increase 1719 * the end pointer. Otherwise start a new chunk. 1720 * Note that "end" points one higher than end, 1721 * making the range >= start and < end. 1722 * If we're also doing a speculative memory 1723 * test and we at or past the end, bump up Maxmem 1724 * so that we keep going. The first bad page 1725 * will terminate the loop. 1726 */ 1727 if (phys_avail[pa_indx] == pa) { 1728 phys_avail[pa_indx] += PAGE_SIZE; 1729 } else { 1730 pa_indx++; 1731 if (pa_indx == PHYS_AVAIL_ARRAY_END) { 1732 printf("Too many holes in the physical address space, giving up\n"); 1733 pa_indx--; 1734 break; 1735 } 1736 phys_avail[pa_indx++] = pa; /* start */ 1737 phys_avail[pa_indx] = pa + PAGE_SIZE; /* end */ 1738 } 1739 physmem++; 1740 } 1741 } 1742 *pte = 0; 1743 invltlb(); 1744 1745 /* 1746 * XXX 1747 * The last chunk must contain at least one page plus the message 1748 * buffer to avoid complicating other code (message buffer address 1749 * calculation, etc.). 1750 */ 1751 while (phys_avail[pa_indx - 1] + PAGE_SIZE + 1752 round_page(MSGBUF_SIZE) >= phys_avail[pa_indx]) { 1753 physmem -= atop(phys_avail[pa_indx] - phys_avail[pa_indx - 1]); 1754 phys_avail[pa_indx--] = 0; 1755 phys_avail[pa_indx--] = 0; 1756 } 1757 1758 Maxmem = atop(phys_avail[pa_indx]); 1759 1760 /* Trim off space for the message buffer. */ 1761 phys_avail[pa_indx] -= round_page(MSGBUF_SIZE); 1762 1763 avail_end = phys_avail[pa_indx]; 1764} 1765 1766void 1767init386(first) 1768 int first; 1769{ 1770 int x; 1771 struct gate_descriptor *gdp; 1772 int gsel_tss; 1773#ifndef SMP 1774 /* table descriptors - used to load tables by microp */ 1775 struct region_descriptor r_gdt, r_idt; 1776#endif 1777 int off; 1778 1779 /* 1780 * Prevent lowering of the ipl if we call tsleep() early. 1781 */ 1782 safepri = cpl; 1783 1784 proc0.p_addr = proc0paddr; 1785 1786 atdevbase = ISA_HOLE_START + KERNBASE; 1787 1788 if (bootinfo.bi_modulep) { 1789 preload_metadata = (caddr_t)bootinfo.bi_modulep + KERNBASE; 1790 preload_bootstrap_relocate(KERNBASE); 1791 } 1792 if (bootinfo.bi_envp) 1793 kern_envp = (caddr_t)bootinfo.bi_envp + KERNBASE; 1794 1795 /* 1796 * make gdt memory segments, the code segment goes up to end of the 1797 * page with etext in it, the data segment goes to the end of 1798 * the address space 1799 */ 1800 /* 1801 * XXX text protection is temporarily (?) disabled. The limit was 1802 * i386_btop(round_page(etext)) - 1. 1803 */ 1804 gdt_segs[GCODE_SEL].ssd_limit = i386_btop(0) - 1; 1805 gdt_segs[GDATA_SEL].ssd_limit = i386_btop(0) - 1; 1806#ifdef SMP 1807 gdt_segs[GPRIV_SEL].ssd_limit = 1808 i386_btop(sizeof(struct privatespace)) - 1; 1809 gdt_segs[GPRIV_SEL].ssd_base = (int) &SMP_prvspace[0]; 1810 gdt_segs[GPROC0_SEL].ssd_base = 1811 (int) &SMP_prvspace[0].globaldata.gd_common_tss; 1812 SMP_prvspace[0].globaldata.gd_prvspace = &SMP_prvspace[0]; 1813#else 1814 gdt_segs[GPRIV_SEL].ssd_limit = i386_btop(0) - 1; 1815 gdt_segs[GPROC0_SEL].ssd_base = (int) &common_tss; 1816#endif 1817 1818 for (x = 0; x < NGDT; x++) { 1819#ifdef BDE_DEBUGGER 1820 /* avoid overwriting db entries with APM ones */ 1821 if (x >= GAPMCODE32_SEL && x <= GAPMDATA_SEL) 1822 continue; 1823#endif 1824 ssdtosd(&gdt_segs[x], &gdt[x].sd); 1825 } 1826 1827 r_gdt.rd_limit = NGDT * sizeof(gdt[0]) - 1; 1828 r_gdt.rd_base = (int) gdt; 1829 lgdt(&r_gdt); 1830 1831 /* make ldt memory segments */ 1832 /* 1833 * The data segment limit must not cover the user area because we 1834 * don't want the user area to be writable in copyout() etc. (page 1835 * level protection is lost in kernel mode on 386's). Also, we 1836 * don't want the user area to be writable directly (page level 1837 * protection of the user area is not available on 486's with 1838 * CR0_WP set, because there is no user-read/kernel-write mode). 1839 * 1840 * XXX - VM_MAXUSER_ADDRESS is an end address, not a max. And it 1841 * should be spelled ...MAX_USER... 1842 */ 1843#define VM_END_USER_RW_ADDRESS VM_MAXUSER_ADDRESS 1844 /* 1845 * The code segment limit has to cover the user area until we move 1846 * the signal trampoline out of the user area. This is safe because 1847 * the code segment cannot be written to directly. 1848 */ 1849#define VM_END_USER_R_ADDRESS (VM_END_USER_RW_ADDRESS + UPAGES * PAGE_SIZE) 1850 ldt_segs[LUCODE_SEL].ssd_limit = i386_btop(VM_END_USER_R_ADDRESS) - 1; 1851 ldt_segs[LUDATA_SEL].ssd_limit = i386_btop(VM_END_USER_RW_ADDRESS) - 1; 1852 for (x = 0; x < sizeof ldt_segs / sizeof ldt_segs[0]; x++) 1853 ssdtosd(&ldt_segs[x], &ldt[x].sd); 1854 1855 _default_ldt = GSEL(GLDT_SEL, SEL_KPL); 1856 lldt(_default_ldt); 1857#ifdef USER_LDT 1858 currentldt = _default_ldt; 1859#endif 1860 1861 /* exceptions */ 1862 for (x = 0; x < NIDT; x++) 1863 setidt(x, &IDTVEC(rsvd), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1864 setidt(0, &IDTVEC(div), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1865 setidt(1, &IDTVEC(dbg), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1866 setidt(2, &IDTVEC(nmi), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1867 setidt(3, &IDTVEC(bpt), SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL)); 1868 setidt(4, &IDTVEC(ofl), SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL)); 1869 setidt(5, &IDTVEC(bnd), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1870 setidt(6, &IDTVEC(ill), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1871 setidt(7, &IDTVEC(dna), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1872 setidt(8, 0, SDT_SYSTASKGT, SEL_KPL, GSEL(GPANIC_SEL, SEL_KPL)); 1873 setidt(9, &IDTVEC(fpusegm), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1874 setidt(10, &IDTVEC(tss), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1875 setidt(11, &IDTVEC(missing), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1876 setidt(12, &IDTVEC(stk), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1877 setidt(13, &IDTVEC(prot), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1878 setidt(14, &IDTVEC(page), SDT_SYS386IGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1879 setidt(15, &IDTVEC(rsvd), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1880 setidt(16, &IDTVEC(fpu), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1881 setidt(17, &IDTVEC(align), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1882 setidt(18, &IDTVEC(mchk), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1883 setidt(0x80, &IDTVEC(int0x80_syscall), 1884 SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL)); 1885 1886 r_idt.rd_limit = sizeof(idt0) - 1; 1887 r_idt.rd_base = (int) idt; 1888 lidt(&r_idt); 1889 1890 /* 1891 * Initialize the console before we print anything out. 1892 */ 1893 cninit(); 1894 1895#include "isa.h" 1896#if NISA >0 1897 isa_defaultirq(); 1898#endif 1899 rand_initialize(); 1900 1901#ifdef DDB 1902 kdb_init(); 1903 if (boothowto & RB_KDB) 1904 Debugger("Boot flags requested debugger"); 1905#endif 1906 1907 finishidentcpu(); /* Final stage of CPU initialization */ 1908 setidt(6, &IDTVEC(ill), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1909 setidt(13, &IDTVEC(prot), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1910 initializecpu(); /* Initialize CPU registers */ 1911 1912 /* make an initial tss so cpu can get interrupt stack on syscall! */ 1913 common_tss.tss_esp0 = (int) proc0.p_addr + UPAGES*PAGE_SIZE - 16; 1914 common_tss.tss_ss0 = GSEL(GDATA_SEL, SEL_KPL) ; 1915 gsel_tss = GSEL(GPROC0_SEL, SEL_KPL); 1916 private_tss = 0; 1917 tss_gdt = &gdt[GPROC0_SEL].sd; 1918 common_tssd = *tss_gdt; 1919 common_tss.tss_ioopt = (sizeof common_tss) << 16; 1920 ltr(gsel_tss); 1921 1922 dblfault_tss.tss_esp = dblfault_tss.tss_esp0 = dblfault_tss.tss_esp1 = 1923 dblfault_tss.tss_esp2 = (int) &dblfault_stack[sizeof(dblfault_stack)]; 1924 dblfault_tss.tss_ss = dblfault_tss.tss_ss0 = dblfault_tss.tss_ss1 = 1925 dblfault_tss.tss_ss2 = GSEL(GDATA_SEL, SEL_KPL); 1926 dblfault_tss.tss_cr3 = (int)IdlePTD; 1927 dblfault_tss.tss_eip = (int) dblfault_handler; 1928 dblfault_tss.tss_eflags = PSL_KERNEL; 1929 dblfault_tss.tss_ds = dblfault_tss.tss_es = 1930 dblfault_tss.tss_gs = GSEL(GDATA_SEL, SEL_KPL); 1931 dblfault_tss.tss_fs = GSEL(GPRIV_SEL, SEL_KPL); 1932 dblfault_tss.tss_cs = GSEL(GCODE_SEL, SEL_KPL); 1933 dblfault_tss.tss_ldt = GSEL(GLDT_SEL, SEL_KPL); 1934 1935 vm86_initialize(); 1936 getmemsize(first); 1937 1938 /* now running on new page tables, configured,and u/iom is accessible */ 1939 1940 /* Map the message buffer. */ 1941 for (off = 0; off < round_page(MSGBUF_SIZE); off += PAGE_SIZE) 1942 pmap_kenter((vm_offset_t)msgbufp + off, avail_end + off); 1943 1944 msgbufinit(msgbufp, MSGBUF_SIZE); 1945 1946 /* make a call gate to reenter kernel with */ 1947 gdp = &ldt[LSYS5CALLS_SEL].gd; 1948 1949 x = (int) &IDTVEC(syscall); 1950 gdp->gd_looffset = x++; 1951 gdp->gd_selector = GSEL(GCODE_SEL,SEL_KPL); 1952 gdp->gd_stkcpy = 1; 1953 gdp->gd_type = SDT_SYS386CGT; 1954 gdp->gd_dpl = SEL_UPL; 1955 gdp->gd_p = 1; 1956 gdp->gd_hioffset = ((int) &IDTVEC(syscall)) >>16; 1957 1958 /* XXX does this work? */ 1959 ldt[LBSDICALLS_SEL] = ldt[LSYS5CALLS_SEL]; 1960 ldt[LSOL26CALLS_SEL] = ldt[LSYS5CALLS_SEL]; 1961 1962 /* transfer to user mode */ 1963 1964 _ucodesel = LSEL(LUCODE_SEL, SEL_UPL); 1965 _udatasel = LSEL(LUDATA_SEL, SEL_UPL); 1966 1967 /* setup proc 0's pcb */ 1968 proc0.p_addr->u_pcb.pcb_flags = 0; 1969 proc0.p_addr->u_pcb.pcb_cr3 = (int)IdlePTD; 1970#ifdef SMP 1971 proc0.p_addr->u_pcb.pcb_mpnest = 1; 1972#endif 1973 proc0.p_addr->u_pcb.pcb_ext = 0; 1974} 1975 1976#if defined(I586_CPU) && !defined(NO_F00F_HACK) 1977static void f00f_hack(void *unused); 1978SYSINIT(f00f_hack, SI_SUB_INTRINSIC, SI_ORDER_FIRST, f00f_hack, NULL); 1979 1980static void 1981f00f_hack(void *unused) { 1982 struct gate_descriptor *new_idt; 1983#ifndef SMP 1984 struct region_descriptor r_idt; 1985#endif 1986 vm_offset_t tmp; 1987 1988 if (!has_f00f_bug) 1989 return; 1990 1991 printf("Intel Pentium detected, installing workaround for F00F bug\n"); 1992 1993 r_idt.rd_limit = sizeof(idt0) - 1; 1994 1995 tmp = kmem_alloc(kernel_map, PAGE_SIZE * 2); 1996 if (tmp == 0) 1997 panic("kmem_alloc returned 0"); 1998 if (((unsigned int)tmp & (PAGE_SIZE-1)) != 0) 1999 panic("kmem_alloc returned non-page-aligned memory"); 2000 /* Put the first seven entries in the lower page */ 2001 new_idt = (struct gate_descriptor*)(tmp + PAGE_SIZE - (7*8)); 2002 bcopy(idt, new_idt, sizeof(idt0)); 2003 r_idt.rd_base = (int)new_idt; 2004 lidt(&r_idt); 2005 idt = new_idt; 2006 if (vm_map_protect(kernel_map, tmp, tmp + PAGE_SIZE, 2007 VM_PROT_READ, FALSE) != KERN_SUCCESS) 2008 panic("vm_map_protect failed"); 2009 return; 2010} 2011#endif /* defined(I586_CPU) && !NO_F00F_HACK */ 2012 2013int 2014ptrace_set_pc(p, addr) 2015 struct proc *p; 2016 unsigned long addr; 2017{ 2018 p->p_md.md_regs->tf_eip = addr; 2019 return (0); 2020} 2021 2022int 2023ptrace_single_step(p) 2024 struct proc *p; 2025{ 2026 p->p_md.md_regs->tf_eflags |= PSL_T; 2027 return (0); 2028} 2029 2030int ptrace_read_u_check(p, addr, len) 2031 struct proc *p; 2032 vm_offset_t addr; 2033 size_t len; 2034{ 2035 vm_offset_t gap; 2036 2037 if ((vm_offset_t) (addr + len) < addr) 2038 return EPERM; 2039 if ((vm_offset_t) (addr + len) <= sizeof(struct user)) 2040 return 0; 2041 2042 gap = (char *) p->p_md.md_regs - (char *) p->p_addr; 2043 2044 if ((vm_offset_t) addr < gap) 2045 return EPERM; 2046 if ((vm_offset_t) (addr + len) <= 2047 (vm_offset_t) (gap + sizeof(struct trapframe))) 2048 return 0; 2049 return EPERM; 2050} 2051 2052int ptrace_write_u(p, off, data) 2053 struct proc *p; 2054 vm_offset_t off; 2055 long data; 2056{ 2057 struct trapframe frame_copy; 2058 vm_offset_t min; 2059 struct trapframe *tp; 2060 2061 /* 2062 * Privileged kernel state is scattered all over the user area. 2063 * Only allow write access to parts of regs and to fpregs. 2064 */ 2065 min = (char *)p->p_md.md_regs - (char *)p->p_addr; 2066 if (off >= min && off <= min + sizeof(struct trapframe) - sizeof(int)) { 2067 tp = p->p_md.md_regs; 2068 frame_copy = *tp; 2069 *(int *)((char *)&frame_copy + (off - min)) = data; 2070 if (!EFL_SECURE(frame_copy.tf_eflags, tp->tf_eflags) || 2071 !CS_SECURE(frame_copy.tf_cs)) 2072 return (EINVAL); 2073 *(int*)((char *)p->p_addr + off) = data; 2074 return (0); 2075 } 2076 min = offsetof(struct user, u_pcb) + offsetof(struct pcb, pcb_savefpu); 2077 if (off >= min && off <= min + sizeof(struct save87) - sizeof(int)) { 2078 *(int*)((char *)p->p_addr + off) = data; 2079 return (0); 2080 } 2081 return (EFAULT); 2082} 2083 2084int 2085fill_regs(p, regs) 2086 struct proc *p; 2087 struct reg *regs; 2088{ 2089 struct pcb *pcb; 2090 struct trapframe *tp; 2091 2092 tp = p->p_md.md_regs; 2093 regs->r_fs = tp->tf_fs; 2094 regs->r_es = tp->tf_es; 2095 regs->r_ds = tp->tf_ds; 2096 regs->r_edi = tp->tf_edi; 2097 regs->r_esi = tp->tf_esi; 2098 regs->r_ebp = tp->tf_ebp; 2099 regs->r_ebx = tp->tf_ebx; 2100 regs->r_edx = tp->tf_edx; 2101 regs->r_ecx = tp->tf_ecx; 2102 regs->r_eax = tp->tf_eax; 2103 regs->r_eip = tp->tf_eip; 2104 regs->r_cs = tp->tf_cs; 2105 regs->r_eflags = tp->tf_eflags; 2106 regs->r_esp = tp->tf_esp; 2107 regs->r_ss = tp->tf_ss; 2108 pcb = &p->p_addr->u_pcb; 2109 regs->r_gs = pcb->pcb_gs; 2110 return (0); 2111} 2112 2113int 2114set_regs(p, regs) 2115 struct proc *p; 2116 struct reg *regs; 2117{ 2118 struct pcb *pcb; 2119 struct trapframe *tp; 2120 2121 tp = p->p_md.md_regs; 2122 if (!EFL_SECURE(regs->r_eflags, tp->tf_eflags) || 2123 !CS_SECURE(regs->r_cs)) 2124 return (EINVAL); 2125 tp->tf_fs = regs->r_fs; 2126 tp->tf_es = regs->r_es; 2127 tp->tf_ds = regs->r_ds; 2128 tp->tf_edi = regs->r_edi; 2129 tp->tf_esi = regs->r_esi; 2130 tp->tf_ebp = regs->r_ebp; 2131 tp->tf_ebx = regs->r_ebx; 2132 tp->tf_edx = regs->r_edx; 2133 tp->tf_ecx = regs->r_ecx; 2134 tp->tf_eax = regs->r_eax; 2135 tp->tf_eip = regs->r_eip; 2136 tp->tf_cs = regs->r_cs; 2137 tp->tf_eflags = regs->r_eflags; 2138 tp->tf_esp = regs->r_esp; 2139 tp->tf_ss = regs->r_ss; 2140 pcb = &p->p_addr->u_pcb; 2141 pcb->pcb_gs = regs->r_gs; 2142 return (0); 2143} 2144 2145int 2146fill_fpregs(p, fpregs) 2147 struct proc *p; 2148 struct fpreg *fpregs; 2149{ 2150 bcopy(&p->p_addr->u_pcb.pcb_savefpu, fpregs, sizeof *fpregs); 2151 return (0); 2152} 2153 2154int 2155set_fpregs(p, fpregs) 2156 struct proc *p; 2157 struct fpreg *fpregs; 2158{ 2159 bcopy(fpregs, &p->p_addr->u_pcb.pcb_savefpu, sizeof *fpregs); 2160 return (0); 2161} 2162 2163int 2164fill_dbregs(p, dbregs) 2165 struct proc *p; 2166 struct dbreg *dbregs; 2167{ 2168 struct pcb *pcb; 2169 2170 pcb = &p->p_addr->u_pcb; 2171 dbregs->dr0 = pcb->pcb_dr0; 2172 dbregs->dr1 = pcb->pcb_dr1; 2173 dbregs->dr2 = pcb->pcb_dr2; 2174 dbregs->dr3 = pcb->pcb_dr3; 2175 dbregs->dr4 = 0; 2176 dbregs->dr5 = 0; 2177 dbregs->dr6 = pcb->pcb_dr6; 2178 dbregs->dr7 = pcb->pcb_dr7; 2179 return (0); 2180} 2181 2182int 2183set_dbregs(p, dbregs) 2184 struct proc *p; 2185 struct dbreg *dbregs; 2186{ 2187 struct pcb *pcb; 2188 2189 pcb = &p->p_addr->u_pcb; 2190 2191 /* 2192 * Don't let a process set a breakpoint that is not within the 2193 * process's address space. If a process could do this, it 2194 * could halt the system by setting a breakpoint in the kernel 2195 * (if ddb was enabled). Thus, we need to check to make sure 2196 * that no breakpoints are being enabled for addresses outside 2197 * process's address space, unless, perhaps, we were called by 2198 * uid 0. 2199 * 2200 * XXX - what about when the watched area of the user's 2201 * address space is written into from within the kernel 2202 * ... wouldn't that still cause a breakpoint to be generated 2203 * from within kernel mode? 2204 */ 2205 2206 if (p->p_cred->pc_ucred->cr_uid != 0) { 2207 if (dbregs->dr7 & 0x3) { 2208 /* dr0 is enabled */ 2209 if (dbregs->dr0 >= VM_MAXUSER_ADDRESS) 2210 return (EINVAL); 2211 } 2212 2213 if (dbregs->dr7 & (0x3<<2)) { 2214 /* dr1 is enabled */ 2215 if (dbregs->dr1 >= VM_MAXUSER_ADDRESS) 2216 return (EINVAL); 2217 } 2218 2219 if (dbregs->dr7 & (0x3<<4)) { 2220 /* dr2 is enabled */ 2221 if (dbregs->dr2 >= VM_MAXUSER_ADDRESS) 2222 return (EINVAL); 2223 } 2224 2225 if (dbregs->dr7 & (0x3<<6)) { 2226 /* dr3 is enabled */ 2227 if (dbregs->dr3 >= VM_MAXUSER_ADDRESS) 2228 return (EINVAL); 2229 } 2230 } 2231 2232 pcb->pcb_dr0 = dbregs->dr0; 2233 pcb->pcb_dr1 = dbregs->dr1; 2234 pcb->pcb_dr2 = dbregs->dr2; 2235 pcb->pcb_dr3 = dbregs->dr3; 2236 pcb->pcb_dr6 = dbregs->dr6; 2237 pcb->pcb_dr7 = dbregs->dr7; 2238 2239 pcb->pcb_flags |= PCB_DBREGS; 2240 2241 return (0); 2242} 2243 2244#ifndef DDB 2245void 2246Debugger(const char *msg) 2247{ 2248 printf("Debugger(\"%s\") called.\n", msg); 2249} 2250#endif /* no DDB */ 2251 2252#include <sys/disklabel.h> 2253 2254/* 2255 * Determine the size of the transfer, and make sure it is 2256 * within the boundaries of the partition. Adjust transfer 2257 * if needed, and signal errors or early completion. 2258 */ 2259int 2260bounds_check_with_label(struct buf *bp, struct disklabel *lp, int wlabel) 2261{ 2262 struct partition *p = lp->d_partitions + dkpart(bp->b_dev); 2263 int labelsect = lp->d_partitions[0].p_offset; 2264 int maxsz = p->p_size, 2265 sz = (bp->b_bcount + DEV_BSIZE - 1) >> DEV_BSHIFT; 2266 2267 /* overwriting disk label ? */ 2268 /* XXX should also protect bootstrap in first 8K */ 2269 if (bp->b_blkno + p->p_offset <= LABELSECTOR + labelsect && 2270#if LABELSECTOR != 0 2271 bp->b_blkno + p->p_offset + sz > LABELSECTOR + labelsect && 2272#endif 2273 (bp->b_flags & B_READ) == 0 && wlabel == 0) { 2274 bp->b_error = EROFS; 2275 goto bad; 2276 } 2277 2278#if defined(DOSBBSECTOR) && defined(notyet) 2279 /* overwriting master boot record? */ 2280 if (bp->b_blkno + p->p_offset <= DOSBBSECTOR && 2281 (bp->b_flags & B_READ) == 0 && wlabel == 0) { 2282 bp->b_error = EROFS; 2283 goto bad; 2284 } 2285#endif 2286 2287 /* beyond partition? */ 2288 if (bp->b_blkno < 0 || bp->b_blkno + sz > maxsz) { 2289 /* if exactly at end of disk, return an EOF */ 2290 if (bp->b_blkno == maxsz) { 2291 bp->b_resid = bp->b_bcount; 2292 return(0); 2293 } 2294 /* or truncate if part of it fits */ 2295 sz = maxsz - bp->b_blkno; 2296 if (sz <= 0) { 2297 bp->b_error = EINVAL; 2298 goto bad; 2299 } 2300 bp->b_bcount = sz << DEV_BSHIFT; 2301 } 2302 2303 bp->b_pblkno = bp->b_blkno + p->p_offset; 2304 return(1); 2305 2306bad: 2307 bp->b_flags |= B_ERROR; 2308 return(-1); 2309} 2310 2311#ifdef DDB 2312 2313/* 2314 * Provide inb() and outb() as functions. They are normally only 2315 * available as macros calling inlined functions, thus cannot be 2316 * called inside DDB. 2317 * 2318 * The actual code is stolen from <machine/cpufunc.h>, and de-inlined. 2319 */ 2320 2321#undef inb 2322#undef outb 2323 2324/* silence compiler warnings */ 2325u_char inb(u_int); 2326void outb(u_int, u_char); 2327 2328u_char 2329inb(u_int port) 2330{ 2331 u_char data; 2332 /* 2333 * We use %%dx and not %1 here because i/o is done at %dx and not at 2334 * %edx, while gcc generates inferior code (movw instead of movl) 2335 * if we tell it to load (u_short) port. 2336 */ 2337 __asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port)); 2338 return (data); 2339} 2340 2341void 2342outb(u_int port, u_char data) 2343{ 2344 u_char al; 2345 /* 2346 * Use an unnecessary assignment to help gcc's register allocator. 2347 * This make a large difference for gcc-1.40 and a tiny difference 2348 * for gcc-2.6.0. For gcc-1.40, al had to be ``asm("ax")'' for 2349 * best results. gcc-2.6.0 can't handle this. 2350 */ 2351 al = data; 2352 __asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port)); 2353} 2354 2355#endif /* DDB */ 2356