machdep.c revision 57178
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 57178 2000-02-13 03:32:07Z peter $ 39 */ 40 41#include "apm.h" 42#include "ether.h" 43#include "npx.h" 44#include "opt_atalk.h" 45#include "opt_compat.h" 46#include "opt_cpu.h" 47#include "opt_ddb.h" 48#include "opt_inet.h" 49#include "opt_ipx.h" 50#include "opt_maxmem.h" 51#include "opt_msgbuf.h" 52#include "opt_perfmon.h" 53#include "opt_smp.h" 54#include "opt_sysvipc.h" 55#include "opt_user_ldt.h" 56#include "opt_userconfig.h" 57 58#include <sys/param.h> 59#include <sys/systm.h> 60#include <sys/sysproto.h> 61#include <sys/signalvar.h> 62#include <sys/kernel.h> 63#include <sys/linker.h> 64#include <sys/malloc.h> 65#include <sys/proc.h> 66#include <sys/buf.h> 67#include <sys/reboot.h> 68#include <sys/callout.h> 69#include <sys/mbuf.h> 70#include <sys/msgbuf.h> 71#include <sys/sysent.h> 72#include <sys/sysctl.h> 73#include <sys/vmmeter.h> 74#include <sys/bus.h> 75 76#ifdef SYSVSHM 77#include <sys/shm.h> 78#endif 79 80#ifdef SYSVMSG 81#include <sys/msg.h> 82#endif 83 84#ifdef SYSVSEM 85#include <sys/sem.h> 86#endif 87 88#include <vm/vm.h> 89#include <vm/vm_param.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 = 50; 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 455int 456unregister_netisr(num) 457 int num; 458{ 459 460 if (num < 0 || num >= (sizeof(netisrs)/sizeof(*netisrs)) ) { 461 printf("unregister_netisr: bad isr number: %d\n", num); 462 return (EINVAL); 463 } 464 netisrs[num] = NULL; 465 return (0); 466} 467 468/* 469 * Send an interrupt to process. 470 * 471 * Stack is set up to allow sigcode stored 472 * at top to call routine, followed by kcall 473 * to sigreturn routine below. After sigreturn 474 * resets the signal mask, the stack, and the 475 * frame pointer, it returns to the user 476 * specified pc, psl. 477 */ 478static void 479osendsig(sig_t catcher, int sig, sigset_t *mask, u_long code) 480{ 481 register struct proc *p = curproc; 482 register struct trapframe *regs; 483 register struct osigframe *fp; 484 struct osigframe sf; 485 struct sigacts *psp = p->p_sigacts; 486 int oonstack; 487 488 regs = p->p_md.md_regs; 489 oonstack = (p->p_sigstk.ss_flags & SS_ONSTACK) ? 1 : 0; 490 491 /* Allocate and validate space for the signal handler context. */ 492 if ((p->p_flag & P_ALTSTACK) && !oonstack && 493 SIGISMEMBER(psp->ps_sigonstack, sig)) { 494 fp = (struct osigframe *)(p->p_sigstk.ss_sp + 495 p->p_sigstk.ss_size - sizeof(struct osigframe)); 496 p->p_sigstk.ss_flags |= SS_ONSTACK; 497 } 498 else 499 fp = (struct osigframe *)regs->tf_esp - 1; 500 501 /* 502 * grow() will return FALSE if the fp will not fit inside the stack 503 * and the stack can not be grown. useracc will return FALSE 504 * if access is denied. 505 */ 506 if (grow_stack(p, (int)fp) == FALSE || 507 !useracc((caddr_t)fp, sizeof(struct osigframe), VM_PROT_WRITE)) { 508 /* 509 * Process has trashed its stack; give it an illegal 510 * instruction to halt it in its tracks. 511 */ 512 SIGACTION(p, SIGILL) = SIG_DFL; 513 SIGDELSET(p->p_sigignore, SIGILL); 514 SIGDELSET(p->p_sigcatch, SIGILL); 515 SIGDELSET(p->p_sigmask, SIGILL); 516 psignal(p, SIGILL); 517 return; 518 } 519 520 /* Translate the signal if appropriate */ 521 if (p->p_sysent->sv_sigtbl) { 522 if (sig <= p->p_sysent->sv_sigsize) 523 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)]; 524 } 525 526 /* Build the argument list for the signal handler. */ 527 sf.sf_signum = sig; 528 sf.sf_scp = (register_t)&fp->sf_siginfo.si_sc; 529 if (SIGISMEMBER(p->p_sigacts->ps_siginfo, sig)) { 530 /* Signal handler installed with SA_SIGINFO. */ 531 sf.sf_arg2 = (register_t)&fp->sf_siginfo; 532 sf.sf_siginfo.si_signo = sig; 533 sf.sf_siginfo.si_code = code; 534 sf.sf_ahu.sf_action = (__osiginfohandler_t *)catcher; 535 } 536 else { 537 /* Old FreeBSD-style arguments. */ 538 sf.sf_arg2 = code; 539 sf.sf_addr = regs->tf_err; 540 sf.sf_ahu.sf_handler = catcher; 541 } 542 543 /* save scratch registers */ 544 sf.sf_siginfo.si_sc.sc_eax = regs->tf_eax; 545 sf.sf_siginfo.si_sc.sc_ebx = regs->tf_ebx; 546 sf.sf_siginfo.si_sc.sc_ecx = regs->tf_ecx; 547 sf.sf_siginfo.si_sc.sc_edx = regs->tf_edx; 548 sf.sf_siginfo.si_sc.sc_esi = regs->tf_esi; 549 sf.sf_siginfo.si_sc.sc_edi = regs->tf_edi; 550 sf.sf_siginfo.si_sc.sc_cs = regs->tf_cs; 551 sf.sf_siginfo.si_sc.sc_ds = regs->tf_ds; 552 sf.sf_siginfo.si_sc.sc_ss = regs->tf_ss; 553 sf.sf_siginfo.si_sc.sc_es = regs->tf_es; 554 sf.sf_siginfo.si_sc.sc_fs = regs->tf_fs; 555 sf.sf_siginfo.si_sc.sc_gs = rgs(); 556 sf.sf_siginfo.si_sc.sc_isp = regs->tf_isp; 557 558 /* Build the signal context to be used by sigreturn. */ 559 sf.sf_siginfo.si_sc.sc_onstack = oonstack; 560 SIG2OSIG(*mask, sf.sf_siginfo.si_sc.sc_mask); 561 sf.sf_siginfo.si_sc.sc_sp = regs->tf_esp; 562 sf.sf_siginfo.si_sc.sc_fp = regs->tf_ebp; 563 sf.sf_siginfo.si_sc.sc_pc = regs->tf_eip; 564 sf.sf_siginfo.si_sc.sc_ps = regs->tf_eflags; 565 sf.sf_siginfo.si_sc.sc_trapno = regs->tf_trapno; 566 sf.sf_siginfo.si_sc.sc_err = regs->tf_err; 567 568 /* 569 * If we're a vm86 process, we want to save the segment registers. 570 * We also change eflags to be our emulated eflags, not the actual 571 * eflags. 572 */ 573 if (regs->tf_eflags & PSL_VM) { 574 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs; 575 struct vm86_kernel *vm86 = &p->p_addr->u_pcb.pcb_ext->ext_vm86; 576 577 sf.sf_siginfo.si_sc.sc_gs = tf->tf_vm86_gs; 578 sf.sf_siginfo.si_sc.sc_fs = tf->tf_vm86_fs; 579 sf.sf_siginfo.si_sc.sc_es = tf->tf_vm86_es; 580 sf.sf_siginfo.si_sc.sc_ds = tf->tf_vm86_ds; 581 582 if (vm86->vm86_has_vme == 0) 583 sf.sf_siginfo.si_sc.sc_ps = 584 (tf->tf_eflags & ~(PSL_VIF | PSL_VIP)) 585 | (vm86->vm86_eflags & (PSL_VIF | PSL_VIP)); 586 /* see sendsig for comment */ 587 tf->tf_eflags &= ~(PSL_VM|PSL_NT|PSL_T|PSL_VIF|PSL_VIP); 588 } 589 590 /* Copy the sigframe out to the user's stack. */ 591 if (copyout(&sf, fp, sizeof(struct osigframe)) != 0) { 592 /* 593 * Something is wrong with the stack pointer. 594 * ...Kill the process. 595 */ 596 sigexit(p, SIGILL); 597 } 598 599 regs->tf_esp = (int)fp; 600 regs->tf_eip = PS_STRINGS - szosigcode; 601 regs->tf_cs = _ucodesel; 602 regs->tf_ds = _udatasel; 603 regs->tf_es = _udatasel; 604 regs->tf_fs = _udatasel; 605 load_gs(_udatasel); 606 regs->tf_ss = _udatasel; 607} 608 609void 610sendsig(catcher, sig, mask, code) 611 sig_t catcher; 612 int sig; 613 sigset_t *mask; 614 u_long code; 615{ 616 struct proc *p = curproc; 617 struct trapframe *regs; 618 struct sigacts *psp = p->p_sigacts; 619 struct sigframe sf, *sfp; 620 int oonstack; 621 622 if (SIGISMEMBER(psp->ps_osigset, sig)) { 623 osendsig(catcher, sig, mask, code); 624 return; 625 } 626 627 regs = p->p_md.md_regs; 628 oonstack = (p->p_sigstk.ss_flags & SS_ONSTACK) ? 1 : 0; 629 630 /* save user context */ 631 bzero(&sf, sizeof(struct sigframe)); 632 sf.sf_uc.uc_sigmask = *mask; 633 sf.sf_uc.uc_stack = p->p_sigstk; 634 sf.sf_uc.uc_mcontext.mc_onstack = oonstack; 635 sf.sf_uc.uc_mcontext.mc_gs = rgs(); 636 bcopy(regs, &sf.sf_uc.uc_mcontext.mc_fs, sizeof(struct trapframe)); 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 p->p_sigstk.ss_flags |= SS_ONSTACK; 644 } 645 else 646 sfp = (struct sigframe *)regs->tf_esp - 1; 647 648 /* 649 * grow() will return FALSE if the sfp will not fit inside the stack 650 * and the stack can not be grown. useracc will return FALSE if 651 * access is denied. 652 */ 653 if (grow_stack(p, (int)sfp) == FALSE || 654 !useracc((caddr_t)sfp, sizeof(struct sigframe), VM_PROT_WRITE)) { 655 /* 656 * Process has trashed its stack; give it an illegal 657 * instruction to halt it in its tracks. 658 */ 659#ifdef DEBUG 660 printf("process %d has trashed its stack\n", p->p_pid); 661#endif 662 SIGACTION(p, SIGILL) = SIG_DFL; 663 SIGDELSET(p->p_sigignore, SIGILL); 664 SIGDELSET(p->p_sigcatch, SIGILL); 665 SIGDELSET(p->p_sigmask, SIGILL); 666 psignal(p, SIGILL); 667 return; 668 } 669 670 /* Translate the signal is appropriate */ 671 if (p->p_sysent->sv_sigtbl) { 672 if (sig <= p->p_sysent->sv_sigsize) 673 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)]; 674 } 675 676 /* Build the argument list for the signal handler. */ 677 sf.sf_signum = sig; 678 sf.sf_ucontext = (register_t)&sfp->sf_uc; 679 if (SIGISMEMBER(p->p_sigacts->ps_siginfo, sig)) { 680 /* Signal handler installed with SA_SIGINFO. */ 681 sf.sf_siginfo = (register_t)&sfp->sf_si; 682 sf.sf_ahu.sf_action = (__siginfohandler_t *)catcher; 683 684 /* fill siginfo structure */ 685 sf.sf_si.si_signo = sig; 686 sf.sf_si.si_code = code; 687 sf.sf_si.si_addr = (void*)regs->tf_err; 688 } 689 else { 690 /* Old FreeBSD-style arguments. */ 691 sf.sf_siginfo = code; 692 sf.sf_addr = regs->tf_err; 693 sf.sf_ahu.sf_handler = catcher; 694 } 695 696 /* 697 * If we're a vm86 process, we want to save the segment registers. 698 * We also change eflags to be our emulated eflags, not the actual 699 * eflags. 700 */ 701 if (regs->tf_eflags & PSL_VM) { 702 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs; 703 struct vm86_kernel *vm86 = &p->p_addr->u_pcb.pcb_ext->ext_vm86; 704 705 sf.sf_uc.uc_mcontext.mc_gs = tf->tf_vm86_gs; 706 sf.sf_uc.uc_mcontext.mc_fs = tf->tf_vm86_fs; 707 sf.sf_uc.uc_mcontext.mc_es = tf->tf_vm86_es; 708 sf.sf_uc.uc_mcontext.mc_ds = tf->tf_vm86_ds; 709 710 if (vm86->vm86_has_vme == 0) 711 sf.sf_uc.uc_mcontext.mc_eflags = 712 (tf->tf_eflags & ~(PSL_VIF | PSL_VIP)) | 713 (vm86->vm86_eflags & (PSL_VIF | PSL_VIP)); 714 715 /* 716 * We should never have PSL_T set when returning from vm86 717 * mode. It may be set here if we deliver a signal before 718 * getting to vm86 mode, so turn it off. 719 * 720 * Clear PSL_NT to inhibit T_TSSFLT faults on return from 721 * syscalls made by the signal handler. This just avoids 722 * wasting time for our lazy fixup of such faults. PSL_NT 723 * does nothing in vm86 mode, but vm86 programs can set it 724 * almost legitimately in probes for old cpu types. 725 */ 726 tf->tf_eflags &= ~(PSL_VM|PSL_NT|PSL_T|PSL_VIF|PSL_VIP); 727 } 728 729 /* 730 * Copy the sigframe out to the user's stack. 731 */ 732 if (copyout(&sf, sfp, sizeof(struct sigframe)) != 0) { 733 /* 734 * Something is wrong with the stack pointer. 735 * ...Kill the process. 736 */ 737 sigexit(p, SIGILL); 738 } 739 740 regs->tf_esp = (int)sfp; 741 regs->tf_eip = PS_STRINGS - *(p->p_sysent->sv_szsigcode); 742 regs->tf_cs = _ucodesel; 743 regs->tf_ds = _udatasel; 744 regs->tf_es = _udatasel; 745 regs->tf_fs = _udatasel; 746 load_gs(_udatasel); 747 regs->tf_ss = _udatasel; 748} 749 750/* 751 * System call to cleanup state after a signal 752 * has been taken. Reset signal mask and 753 * stack state from context left by sendsig (above). 754 * Return to previous pc and psl as specified by 755 * context left by sendsig. Check carefully to 756 * make sure that the user has not modified the 757 * state to gain improper privileges. 758 */ 759#define EFL_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) 760#define CS_SECURE(cs) (ISPL(cs) == SEL_UPL) 761 762int 763osigreturn(p, uap) 764 struct proc *p; 765 struct osigreturn_args /* { 766 struct osigcontext *sigcntxp; 767 } */ *uap; 768{ 769 register struct osigcontext *scp; 770 register struct trapframe *regs = p->p_md.md_regs; 771 int eflags; 772 773 scp = uap->sigcntxp; 774 775 if (!useracc((caddr_t)scp, sizeof (struct osigcontext), VM_PROT_READ)) 776 return(EFAULT); 777 778 eflags = scp->sc_ps; 779 if (eflags & PSL_VM) { 780 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs; 781 struct vm86_kernel *vm86; 782 783 /* 784 * if pcb_ext == 0 or vm86_inited == 0, the user hasn't 785 * set up the vm86 area, and we can't enter vm86 mode. 786 */ 787 if (p->p_addr->u_pcb.pcb_ext == 0) 788 return (EINVAL); 789 vm86 = &p->p_addr->u_pcb.pcb_ext->ext_vm86; 790 if (vm86->vm86_inited == 0) 791 return (EINVAL); 792 793 /* go back to user mode if both flags are set */ 794 if ((eflags & PSL_VIP) && (eflags & PSL_VIF)) 795 trapsignal(p, SIGBUS, 0); 796 797 if (vm86->vm86_has_vme) { 798 eflags = (tf->tf_eflags & ~VME_USERCHANGE) | 799 (eflags & VME_USERCHANGE) | PSL_VM; 800 } else { 801 vm86->vm86_eflags = eflags; /* save VIF, VIP */ 802 eflags = (tf->tf_eflags & ~VM_USERCHANGE) | (eflags & VM_USERCHANGE) | PSL_VM; 803 } 804 tf->tf_vm86_ds = scp->sc_ds; 805 tf->tf_vm86_es = scp->sc_es; 806 tf->tf_vm86_fs = scp->sc_fs; 807 tf->tf_vm86_gs = scp->sc_gs; 808 tf->tf_ds = _udatasel; 809 tf->tf_es = _udatasel; 810 tf->tf_fs = _udatasel; 811 } else { 812 /* 813 * Don't allow users to change privileged or reserved flags. 814 */ 815 /* 816 * XXX do allow users to change the privileged flag PSL_RF. 817 * The cpu sets PSL_RF in tf_eflags for faults. Debuggers 818 * should sometimes set it there too. tf_eflags is kept in 819 * the signal context during signal handling and there is no 820 * other place to remember it, so the PSL_RF bit may be 821 * corrupted by the signal handler without us knowing. 822 * Corruption of the PSL_RF bit at worst causes one more or 823 * one less debugger trap, so allowing it is fairly harmless. 824 */ 825 if (!EFL_SECURE(eflags & ~PSL_RF, regs->tf_eflags & ~PSL_RF)) { 826 return(EINVAL); 827 } 828 829 /* 830 * Don't allow users to load a valid privileged %cs. Let the 831 * hardware check for invalid selectors, excess privilege in 832 * other selectors, invalid %eip's and invalid %esp's. 833 */ 834 if (!CS_SECURE(scp->sc_cs)) { 835 trapsignal(p, SIGBUS, T_PROTFLT); 836 return(EINVAL); 837 } 838 regs->tf_ds = scp->sc_ds; 839 regs->tf_es = scp->sc_es; 840 regs->tf_fs = scp->sc_fs; 841 } 842 843 /* restore scratch registers */ 844 regs->tf_eax = scp->sc_eax; 845 regs->tf_ebx = scp->sc_ebx; 846 regs->tf_ecx = scp->sc_ecx; 847 regs->tf_edx = scp->sc_edx; 848 regs->tf_esi = scp->sc_esi; 849 regs->tf_edi = scp->sc_edi; 850 regs->tf_cs = scp->sc_cs; 851 regs->tf_ss = scp->sc_ss; 852 regs->tf_isp = scp->sc_isp; 853 854 if (scp->sc_onstack & 01) 855 p->p_sigstk.ss_flags |= SS_ONSTACK; 856 else 857 p->p_sigstk.ss_flags &= ~SS_ONSTACK; 858 859 SIGSETOLD(p->p_sigmask, scp->sc_mask); 860 SIG_CANTMASK(p->p_sigmask); 861 regs->tf_ebp = scp->sc_fp; 862 regs->tf_esp = scp->sc_sp; 863 regs->tf_eip = scp->sc_pc; 864 regs->tf_eflags = eflags; 865 return(EJUSTRETURN); 866} 867 868int 869sigreturn(p, uap) 870 struct proc *p; 871 struct sigreturn_args /* { 872 ucontext_t *sigcntxp; 873 } */ *uap; 874{ 875 struct trapframe *regs; 876 ucontext_t *ucp; 877 int cs, eflags; 878 879 ucp = uap->sigcntxp; 880 881 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(ucontext_t), VM_PROT_READ)) 894 return (EFAULT); 895 896 regs = p->p_md.md_regs; 897 eflags = ucp->uc_mcontext.mc_eflags; 898 899 if (eflags & PSL_VM) { 900 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs; 901 struct vm86_kernel *vm86; 902 903 /* 904 * if pcb_ext == 0 or vm86_inited == 0, the user hasn't 905 * set up the vm86 area, and we can't enter vm86 mode. 906 */ 907 if (p->p_addr->u_pcb.pcb_ext == 0) 908 return (EINVAL); 909 vm86 = &p->p_addr->u_pcb.pcb_ext->ext_vm86; 910 if (vm86->vm86_inited == 0) 911 return (EINVAL); 912 913 /* go back to user mode if both flags are set */ 914 if ((eflags & PSL_VIP) && (eflags & PSL_VIF)) 915 trapsignal(p, SIGBUS, 0); 916 917 if (vm86->vm86_has_vme) { 918 eflags = (tf->tf_eflags & ~VME_USERCHANGE) | 919 (eflags & VME_USERCHANGE) | PSL_VM; 920 } else { 921 vm86->vm86_eflags = eflags; /* save VIF, VIP */ 922 eflags = (tf->tf_eflags & ~VM_USERCHANGE) | (eflags & VM_USERCHANGE) | PSL_VM; 923 } 924 bcopy(&ucp->uc_mcontext.mc_fs, tf, sizeof(struct trapframe)); 925 tf->tf_eflags = eflags; 926 tf->tf_vm86_ds = tf->tf_ds; 927 tf->tf_vm86_es = tf->tf_es; 928 tf->tf_vm86_fs = tf->tf_fs; 929 tf->tf_vm86_gs = ucp->uc_mcontext.mc_gs; 930 tf->tf_ds = _udatasel; 931 tf->tf_es = _udatasel; 932 tf->tf_fs = _udatasel; 933 } else { 934 /* 935 * Don't allow users to change privileged or reserved flags. 936 */ 937 /* 938 * XXX do allow users to change the privileged flag PSL_RF. 939 * The cpu sets PSL_RF in tf_eflags for faults. Debuggers 940 * should sometimes set it there too. tf_eflags is kept in 941 * the signal context during signal handling and there is no 942 * other place to remember it, so the PSL_RF bit may be 943 * corrupted by the signal handler without us knowing. 944 * Corruption of the PSL_RF bit at worst causes one more or 945 * one less debugger trap, so allowing it is fairly harmless. 946 */ 947 if (!EFL_SECURE(eflags & ~PSL_RF, regs->tf_eflags & ~PSL_RF)) { 948 printf("sigreturn: eflags = 0x%x\n", eflags); 949 return(EINVAL); 950 } 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 cs = ucp->uc_mcontext.mc_cs; 958 if (!CS_SECURE(cs)) { 959 printf("sigreturn: cs = 0x%x\n", cs); 960 trapsignal(p, SIGBUS, T_PROTFLT); 961 return(EINVAL); 962 } 963 bcopy(&ucp->uc_mcontext.mc_fs, regs, sizeof(struct trapframe)); 964 } 965 966 if (ucp->uc_mcontext.mc_onstack & 1) 967 p->p_sigstk.ss_flags |= SS_ONSTACK; 968 else 969 p->p_sigstk.ss_flags &= ~SS_ONSTACK; 970 971 p->p_sigmask = ucp->uc_sigmask; 972 SIG_CANTMASK(p->p_sigmask); 973 return(EJUSTRETURN); 974} 975 976/* 977 * Machine dependent boot() routine 978 * 979 * I haven't seen anything to put here yet 980 * Possibly some stuff might be grafted back here from boot() 981 */ 982void 983cpu_boot(int howto) 984{ 985} 986 987/* 988 * Shutdown the CPU as much as possible 989 */ 990void 991cpu_halt(void) 992{ 993 for (;;) 994 __asm__ ("hlt"); 995} 996 997/* 998 * Clear registers on exec 999 */ 1000void 1001setregs(p, entry, stack, ps_strings) 1002 struct proc *p; 1003 u_long entry; 1004 u_long stack; 1005 u_long ps_strings; 1006{ 1007 struct trapframe *regs = p->p_md.md_regs; 1008 struct pcb *pcb = &p->p_addr->u_pcb; 1009 1010#ifdef USER_LDT 1011 /* was i386_user_cleanup() in NetBSD */ 1012 user_ldt_free(pcb); 1013#endif 1014 1015 bzero((char *)regs, sizeof(struct trapframe)); 1016 regs->tf_eip = entry; 1017 regs->tf_esp = stack; 1018 regs->tf_eflags = PSL_USER | (regs->tf_eflags & PSL_T); 1019 regs->tf_ss = _udatasel; 1020 regs->tf_ds = _udatasel; 1021 regs->tf_es = _udatasel; 1022 regs->tf_fs = _udatasel; 1023 regs->tf_cs = _ucodesel; 1024 1025 /* PS_STRINGS value for BSD/OS binaries. It is 0 for non-BSD/OS. */ 1026 regs->tf_ebx = ps_strings; 1027 1028 /* reset %gs as well */ 1029 if (pcb == curpcb) 1030 load_gs(_udatasel); 1031 else 1032 pcb->pcb_gs = _udatasel; 1033 1034 /* 1035 * Initialize the math emulator (if any) for the current process. 1036 * Actually, just clear the bit that says that the emulator has 1037 * been initialized. Initialization is delayed until the process 1038 * traps to the emulator (if it is done at all) mainly because 1039 * emulators don't provide an entry point for initialization. 1040 */ 1041 p->p_addr->u_pcb.pcb_flags &= ~FP_SOFTFP; 1042 1043 /* 1044 * Arrange to trap the next npx or `fwait' instruction (see npx.c 1045 * for why fwait must be trapped at least if there is an npx or an 1046 * emulator). This is mainly to handle the case where npx0 is not 1047 * configured, since the npx routines normally set up the trap 1048 * otherwise. It should be done only at boot time, but doing it 1049 * here allows modifying `npx_exists' for testing the emulator on 1050 * systems with an npx. 1051 */ 1052 load_cr0(rcr0() | CR0_MP | CR0_TS); 1053 1054#if NNPX > 0 1055 /* Initialize the npx (if any) for the current process. */ 1056 npxinit(__INITIAL_NPXCW__); 1057#endif 1058 1059 /* 1060 * XXX - Linux emulator 1061 * Make sure sure edx is 0x0 on entry. Linux binaries depend 1062 * on it. 1063 */ 1064 p->p_retval[1] = 0; 1065} 1066 1067static int 1068sysctl_machdep_adjkerntz SYSCTL_HANDLER_ARGS 1069{ 1070 int error; 1071 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, 1072 req); 1073 if (!error && req->newptr) 1074 resettodr(); 1075 return (error); 1076} 1077 1078SYSCTL_PROC(_machdep, CPU_ADJKERNTZ, adjkerntz, CTLTYPE_INT|CTLFLAG_RW, 1079 &adjkerntz, 0, sysctl_machdep_adjkerntz, "I", ""); 1080 1081SYSCTL_INT(_machdep, CPU_DISRTCSET, disable_rtc_set, 1082 CTLFLAG_RW, &disable_rtc_set, 0, ""); 1083 1084SYSCTL_STRUCT(_machdep, CPU_BOOTINFO, bootinfo, 1085 CTLFLAG_RD, &bootinfo, bootinfo, ""); 1086 1087SYSCTL_INT(_machdep, CPU_WALLCLOCK, wall_cmos_clock, 1088 CTLFLAG_RW, &wall_cmos_clock, 0, ""); 1089 1090/* 1091 * Initialize 386 and configure to run kernel 1092 */ 1093 1094/* 1095 * Initialize segments & interrupt table 1096 */ 1097 1098int _default_ldt; 1099#ifdef SMP 1100union descriptor gdt[NGDT * NCPU]; /* global descriptor table */ 1101#else 1102union descriptor gdt[NGDT]; /* global descriptor table */ 1103#endif 1104static struct gate_descriptor idt0[NIDT]; 1105struct gate_descriptor *idt = &idt0[0]; /* interrupt descriptor table */ 1106union descriptor ldt[NLDT]; /* local descriptor table */ 1107#ifdef SMP 1108/* table descriptors - used to load tables by microp */ 1109struct region_descriptor r_gdt, r_idt; 1110#endif 1111 1112#ifndef SMP 1113extern struct segment_descriptor common_tssd, *tss_gdt; 1114#endif 1115int private_tss; /* flag indicating private tss */ 1116 1117#if defined(I586_CPU) && !defined(NO_F00F_HACK) 1118extern int has_f00f_bug; 1119#endif 1120 1121static struct i386tss dblfault_tss; 1122static char dblfault_stack[PAGE_SIZE]; 1123 1124extern struct user *proc0paddr; 1125 1126 1127/* software prototypes -- in more palatable form */ 1128struct soft_segment_descriptor gdt_segs[] = { 1129/* GNULL_SEL 0 Null Descriptor */ 1130{ 0x0, /* segment base address */ 1131 0x0, /* length */ 1132 0, /* segment type */ 1133 0, /* segment descriptor priority level */ 1134 0, /* segment descriptor present */ 1135 0, 0, 1136 0, /* default 32 vs 16 bit size */ 1137 0 /* limit granularity (byte/page units)*/ }, 1138/* GCODE_SEL 1 Code Descriptor for kernel */ 1139{ 0x0, /* segment base address */ 1140 0xfffff, /* length - all address space */ 1141 SDT_MEMERA, /* segment type */ 1142 0, /* segment descriptor priority level */ 1143 1, /* segment descriptor present */ 1144 0, 0, 1145 1, /* default 32 vs 16 bit size */ 1146 1 /* limit granularity (byte/page units)*/ }, 1147/* GDATA_SEL 2 Data Descriptor for kernel */ 1148{ 0x0, /* segment base address */ 1149 0xfffff, /* length - all address space */ 1150 SDT_MEMRWA, /* segment type */ 1151 0, /* segment descriptor priority level */ 1152 1, /* segment descriptor present */ 1153 0, 0, 1154 1, /* default 32 vs 16 bit size */ 1155 1 /* limit granularity (byte/page units)*/ }, 1156/* GPRIV_SEL 3 SMP Per-Processor Private Data Descriptor */ 1157{ 0x0, /* segment base address */ 1158 0xfffff, /* length - all address space */ 1159 SDT_MEMRWA, /* segment type */ 1160 0, /* segment descriptor priority level */ 1161 1, /* segment descriptor present */ 1162 0, 0, 1163 1, /* default 32 vs 16 bit size */ 1164 1 /* limit granularity (byte/page units)*/ }, 1165/* GPROC0_SEL 4 Proc 0 Tss Descriptor */ 1166{ 1167 0x0, /* segment base address */ 1168 sizeof(struct i386tss)-1,/* length - all address space */ 1169 SDT_SYS386TSS, /* segment type */ 1170 0, /* segment descriptor priority level */ 1171 1, /* segment descriptor present */ 1172 0, 0, 1173 0, /* unused - default 32 vs 16 bit size */ 1174 0 /* limit granularity (byte/page units)*/ }, 1175/* GLDT_SEL 5 LDT Descriptor */ 1176{ (int) ldt, /* segment base address */ 1177 sizeof(ldt)-1, /* length - all address space */ 1178 SDT_SYSLDT, /* segment type */ 1179 SEL_UPL, /* segment descriptor priority level */ 1180 1, /* segment descriptor present */ 1181 0, 0, 1182 0, /* unused - default 32 vs 16 bit size */ 1183 0 /* limit granularity (byte/page units)*/ }, 1184/* GUSERLDT_SEL 6 User LDT Descriptor per process */ 1185{ (int) ldt, /* segment base address */ 1186 (512 * sizeof(union descriptor)-1), /* length */ 1187 SDT_SYSLDT, /* segment type */ 1188 0, /* segment descriptor priority level */ 1189 1, /* segment descriptor present */ 1190 0, 0, 1191 0, /* unused - default 32 vs 16 bit size */ 1192 0 /* limit granularity (byte/page units)*/ }, 1193/* GTGATE_SEL 7 Null Descriptor - Placeholder */ 1194{ 0x0, /* segment base address */ 1195 0x0, /* length - all address space */ 1196 0, /* segment type */ 1197 0, /* segment descriptor priority level */ 1198 0, /* segment descriptor present */ 1199 0, 0, 1200 0, /* default 32 vs 16 bit size */ 1201 0 /* limit granularity (byte/page units)*/ }, 1202/* GBIOSLOWMEM_SEL 8 BIOS access to realmode segment 0x40, must be #8 in GDT */ 1203{ 0x400, /* segment base address */ 1204 0xfffff, /* length */ 1205 SDT_MEMRWA, /* segment type */ 1206 0, /* segment descriptor priority level */ 1207 1, /* segment descriptor present */ 1208 0, 0, 1209 1, /* default 32 vs 16 bit size */ 1210 1 /* limit granularity (byte/page units)*/ }, 1211/* GPANIC_SEL 9 Panic Tss Descriptor */ 1212{ (int) &dblfault_tss, /* segment base address */ 1213 sizeof(struct i386tss)-1,/* length - all address space */ 1214 SDT_SYS386TSS, /* segment type */ 1215 0, /* segment descriptor priority level */ 1216 1, /* segment descriptor present */ 1217 0, 0, 1218 0, /* unused - default 32 vs 16 bit size */ 1219 0 /* limit granularity (byte/page units)*/ }, 1220/* GBIOSCODE32_SEL 10 BIOS 32-bit interface (32bit Code) */ 1221{ 0, /* segment base address (overwritten) */ 1222 0xfffff, /* length */ 1223 SDT_MEMERA, /* segment type */ 1224 0, /* segment descriptor priority level */ 1225 1, /* segment descriptor present */ 1226 0, 0, 1227 0, /* default 32 vs 16 bit size */ 1228 1 /* limit granularity (byte/page units)*/ }, 1229/* GBIOSCODE16_SEL 11 BIOS 32-bit interface (16bit Code) */ 1230{ 0, /* segment base address (overwritten) */ 1231 0xfffff, /* length */ 1232 SDT_MEMERA, /* segment type */ 1233 0, /* segment descriptor priority level */ 1234 1, /* segment descriptor present */ 1235 0, 0, 1236 0, /* default 32 vs 16 bit size */ 1237 1 /* limit granularity (byte/page units)*/ }, 1238/* GBIOSDATA_SEL 12 BIOS 32-bit interface (Data) */ 1239{ 0, /* segment base address (overwritten) */ 1240 0xfffff, /* length */ 1241 SDT_MEMRWA, /* segment type */ 1242 0, /* segment descriptor priority level */ 1243 1, /* segment descriptor present */ 1244 0, 0, 1245 1, /* default 32 vs 16 bit size */ 1246 1 /* limit granularity (byte/page units)*/ }, 1247/* GBIOSUTIL_SEL 13 BIOS 16-bit interface (Utility) */ 1248{ 0, /* segment base address (overwritten) */ 1249 0xfffff, /* length */ 1250 SDT_MEMRWA, /* segment type */ 1251 0, /* segment descriptor priority level */ 1252 1, /* segment descriptor present */ 1253 0, 0, 1254 0, /* default 32 vs 16 bit size */ 1255 1 /* limit granularity (byte/page units)*/ }, 1256/* GBIOSARGS_SEL 14 BIOS 16-bit interface (Arguments) */ 1257{ 0, /* segment base address (overwritten) */ 1258 0xfffff, /* length */ 1259 SDT_MEMRWA, /* segment type */ 1260 0, /* segment descriptor priority level */ 1261 1, /* segment descriptor present */ 1262 0, 0, 1263 0, /* default 32 vs 16 bit size */ 1264 1 /* limit granularity (byte/page units)*/ }, 1265}; 1266 1267static struct soft_segment_descriptor ldt_segs[] = { 1268 /* Null Descriptor - overwritten by call gate */ 1269{ 0x0, /* segment base address */ 1270 0x0, /* length - all address space */ 1271 0, /* segment type */ 1272 0, /* segment descriptor priority level */ 1273 0, /* segment descriptor present */ 1274 0, 0, 1275 0, /* default 32 vs 16 bit size */ 1276 0 /* limit granularity (byte/page units)*/ }, 1277 /* Null Descriptor - overwritten by call gate */ 1278{ 0x0, /* segment base address */ 1279 0x0, /* length - all address space */ 1280 0, /* segment type */ 1281 0, /* segment descriptor priority level */ 1282 0, /* segment descriptor present */ 1283 0, 0, 1284 0, /* default 32 vs 16 bit size */ 1285 0 /* limit granularity (byte/page units)*/ }, 1286 /* Null Descriptor - overwritten by call gate */ 1287{ 0x0, /* segment base address */ 1288 0x0, /* length - all address space */ 1289 0, /* segment type */ 1290 0, /* segment descriptor priority level */ 1291 0, /* segment descriptor present */ 1292 0, 0, 1293 0, /* default 32 vs 16 bit size */ 1294 0 /* limit granularity (byte/page units)*/ }, 1295 /* Code Descriptor for user */ 1296{ 0x0, /* segment base address */ 1297 0xfffff, /* length - all address space */ 1298 SDT_MEMERA, /* segment type */ 1299 SEL_UPL, /* segment descriptor priority level */ 1300 1, /* segment descriptor present */ 1301 0, 0, 1302 1, /* default 32 vs 16 bit size */ 1303 1 /* limit granularity (byte/page units)*/ }, 1304 /* Null Descriptor - overwritten by call gate */ 1305{ 0x0, /* segment base address */ 1306 0x0, /* length - all address space */ 1307 0, /* segment type */ 1308 0, /* segment descriptor priority level */ 1309 0, /* segment descriptor present */ 1310 0, 0, 1311 0, /* default 32 vs 16 bit size */ 1312 0 /* limit granularity (byte/page units)*/ }, 1313 /* Data Descriptor for user */ 1314{ 0x0, /* segment base address */ 1315 0xfffff, /* length - all address space */ 1316 SDT_MEMRWA, /* segment type */ 1317 SEL_UPL, /* segment descriptor priority level */ 1318 1, /* segment descriptor present */ 1319 0, 0, 1320 1, /* default 32 vs 16 bit size */ 1321 1 /* limit granularity (byte/page units)*/ }, 1322}; 1323 1324void 1325setidt(idx, func, typ, dpl, selec) 1326 int idx; 1327 inthand_t *func; 1328 int typ; 1329 int dpl; 1330 int selec; 1331{ 1332 struct gate_descriptor *ip; 1333 1334 ip = idt + idx; 1335 ip->gd_looffset = (int)func; 1336 ip->gd_selector = selec; 1337 ip->gd_stkcpy = 0; 1338 ip->gd_xx = 0; 1339 ip->gd_type = typ; 1340 ip->gd_dpl = dpl; 1341 ip->gd_p = 1; 1342 ip->gd_hioffset = ((int)func)>>16 ; 1343} 1344 1345#define IDTVEC(name) __CONCAT(X,name) 1346 1347extern inthand_t 1348 IDTVEC(div), IDTVEC(dbg), IDTVEC(nmi), IDTVEC(bpt), IDTVEC(ofl), 1349 IDTVEC(bnd), IDTVEC(ill), IDTVEC(dna), IDTVEC(fpusegm), 1350 IDTVEC(tss), IDTVEC(missing), IDTVEC(stk), IDTVEC(prot), 1351 IDTVEC(page), IDTVEC(mchk), IDTVEC(rsvd), IDTVEC(fpu), IDTVEC(align), 1352 IDTVEC(syscall), IDTVEC(int0x80_syscall); 1353 1354void 1355sdtossd(sd, ssd) 1356 struct segment_descriptor *sd; 1357 struct soft_segment_descriptor *ssd; 1358{ 1359 ssd->ssd_base = (sd->sd_hibase << 24) | sd->sd_lobase; 1360 ssd->ssd_limit = (sd->sd_hilimit << 16) | sd->sd_lolimit; 1361 ssd->ssd_type = sd->sd_type; 1362 ssd->ssd_dpl = sd->sd_dpl; 1363 ssd->ssd_p = sd->sd_p; 1364 ssd->ssd_def32 = sd->sd_def32; 1365 ssd->ssd_gran = sd->sd_gran; 1366} 1367 1368#define PHYSMAP_SIZE (2 * 8) 1369 1370/* 1371 * Populate the (physmap) array with base/bound pairs describing the 1372 * available physical memory in the system, then test this memory and 1373 * build the phys_avail array describing the actually-available memory. 1374 * 1375 * If we cannot accurately determine the physical memory map, then use 1376 * value from the 0xE801 call, and failing that, the RTC. 1377 * 1378 * Total memory size may be set by the kernel environment variable 1379 * hw.physmem or the compile-time define MAXMEM. 1380 */ 1381static void 1382getmemsize(int first) 1383{ 1384 int i, physmap_idx, pa_indx; 1385 u_int basemem, extmem; 1386 struct vm86frame vmf; 1387 struct vm86context vmc; 1388 vm_offset_t pa, physmap[PHYSMAP_SIZE]; 1389 pt_entry_t pte; 1390 const char *cp; 1391 struct { 1392 u_int64_t base; 1393 u_int64_t length; 1394 u_int32_t type; 1395 } *smap; 1396 1397 bzero(&vmf, sizeof(struct vm86frame)); 1398 bzero(physmap, sizeof(physmap)); 1399 1400 /* 1401 * Perform "base memory" related probes & setup 1402 */ 1403 vm86_intcall(0x12, &vmf); 1404 basemem = vmf.vmf_ax; 1405 if (basemem > 640) { 1406 printf("Preposterous BIOS basemem of %uK, truncating to 640K\n", 1407 basemem); 1408 basemem = 640; 1409 } 1410 1411 /* 1412 * XXX if biosbasemem is now < 640, there is a `hole' 1413 * between the end of base memory and the start of 1414 * ISA memory. The hole may be empty or it may 1415 * contain BIOS code or data. Map it read/write so 1416 * that the BIOS can write to it. (Memory from 0 to 1417 * the physical end of the kernel is mapped read-only 1418 * to begin with and then parts of it are remapped. 1419 * The parts that aren't remapped form holes that 1420 * remain read-only and are unused by the kernel. 1421 * The base memory area is below the physical end of 1422 * the kernel and right now forms a read-only hole. 1423 * The part of it from PAGE_SIZE to 1424 * (trunc_page(biosbasemem * 1024) - 1) will be 1425 * remapped and used by the kernel later.) 1426 * 1427 * This code is similar to the code used in 1428 * pmap_mapdev, but since no memory needs to be 1429 * allocated we simply change the mapping. 1430 */ 1431 for (pa = trunc_page(basemem * 1024); 1432 pa < ISA_HOLE_START; pa += PAGE_SIZE) { 1433 pte = (pt_entry_t)vtopte(pa + KERNBASE); 1434 *pte = pa | PG_RW | PG_V; 1435 } 1436 1437 /* 1438 * if basemem != 640, map pages r/w into vm86 page table so 1439 * that the bios can scribble on it. 1440 */ 1441 pte = (pt_entry_t)vm86paddr; 1442 for (i = basemem / 4; i < 160; i++) 1443 pte[i] = (i << PAGE_SHIFT) | PG_V | PG_RW | PG_U; 1444 1445 /* 1446 * map page 1 R/W into the kernel page table so we can use it 1447 * as a buffer. The kernel will unmap this page later. 1448 */ 1449 pte = (pt_entry_t)vtopte(KERNBASE + (1 << PAGE_SHIFT)); 1450 *pte = (1 << PAGE_SHIFT) | PG_RW | PG_V; 1451 1452 /* 1453 * get memory map with INT 15:E820 1454 */ 1455#define SMAPSIZ sizeof(*smap) 1456#define SMAP_SIG 0x534D4150 /* 'SMAP' */ 1457 1458 vmc.npages = 0; 1459 smap = (void *)vm86_addpage(&vmc, 1, KERNBASE + (1 << PAGE_SHIFT)); 1460 vm86_getptr(&vmc, (vm_offset_t)smap, &vmf.vmf_es, &vmf.vmf_di); 1461 1462 physmap_idx = 0; 1463 vmf.vmf_ebx = 0; 1464 do { 1465 vmf.vmf_eax = 0xE820; 1466 vmf.vmf_edx = SMAP_SIG; 1467 vmf.vmf_ecx = SMAPSIZ; 1468 i = vm86_datacall(0x15, &vmf, &vmc); 1469 if (i || vmf.vmf_eax != SMAP_SIG) 1470 break; 1471 if (boothowto & RB_VERBOSE) 1472 printf("SMAP type=%02x base=%08x %08x len=%08x %08x\n", 1473 smap->type, 1474 *(u_int32_t *)((char *)&smap->base + 4), 1475 (u_int32_t)smap->base, 1476 *(u_int32_t *)((char *)&smap->length + 4), 1477 (u_int32_t)smap->length); 1478 1479 if (smap->type != 0x01) 1480 goto next_run; 1481 1482 if (smap->length == 0) 1483 goto next_run; 1484 1485 if (smap->base >= 0xffffffff) { 1486 printf("%uK of memory above 4GB ignored\n", 1487 (u_int)(smap->length / 1024)); 1488 goto next_run; 1489 } 1490 1491 for (i = 0; i <= physmap_idx; i += 2) { 1492 if (smap->base < physmap[i + 1]) { 1493 if (boothowto & RB_VERBOSE) 1494 printf( 1495 "Overlapping or non-montonic memory region, ignoring second region\n"); 1496 goto next_run; 1497 } 1498 } 1499 1500 if (smap->base == physmap[physmap_idx + 1]) { 1501 physmap[physmap_idx + 1] += smap->length; 1502 goto next_run; 1503 } 1504 1505 physmap_idx += 2; 1506 if (physmap_idx == PHYSMAP_SIZE) { 1507 printf( 1508 "Too many segments in the physical address map, giving up\n"); 1509 break; 1510 } 1511 physmap[physmap_idx] = smap->base; 1512 physmap[physmap_idx + 1] = smap->base + smap->length; 1513next_run: 1514 } while (vmf.vmf_ebx != 0); 1515 1516 if (physmap[1] != 0) 1517 goto physmap_done; 1518 1519 /* 1520 * If we failed above, try memory map with INT 15:E801 1521 */ 1522 vmf.vmf_ax = 0xE801; 1523 if (vm86_intcall(0x15, &vmf) == 0) { 1524 extmem = vmf.vmf_cx + vmf.vmf_dx * 64; 1525 } else { 1526#if 0 1527 vmf.vmf_ah = 0x88; 1528 vm86_intcall(0x15, &vmf); 1529 extmem = vmf.vmf_ax; 1530#else 1531 /* 1532 * Prefer the RTC value for extended memory. 1533 */ 1534 extmem = rtcin(RTC_EXTLO) + (rtcin(RTC_EXTHI) << 8); 1535#endif 1536 } 1537 1538 /* 1539 * Special hack for chipsets that still remap the 384k hole when 1540 * there's 16MB of memory - this really confuses people that 1541 * are trying to use bus mastering ISA controllers with the 1542 * "16MB limit"; they only have 16MB, but the remapping puts 1543 * them beyond the limit. 1544 * 1545 * If extended memory is between 15-16MB (16-17MB phys address range), 1546 * chop it to 15MB. 1547 */ 1548 if ((extmem > 15 * 1024) && (extmem < 16 * 1024)) 1549 extmem = 15 * 1024; 1550 1551 physmap[0] = 0; 1552 physmap[1] = basemem * 1024; 1553 physmap_idx = 2; 1554 physmap[physmap_idx] = 0x100000; 1555 physmap[physmap_idx + 1] = physmap[physmap_idx] + extmem * 1024; 1556 1557physmap_done: 1558 /* 1559 * Now, physmap contains a map of physical memory. 1560 */ 1561 1562#ifdef SMP 1563 /* make hole for AP bootstrap code */ 1564 physmap[1] = mp_bootaddress(physmap[1] / 1024); 1565 1566 /* look for the MP hardware - needed for apic addresses */ 1567 mp_probe(); 1568#endif 1569 1570 /* 1571 * Maxmem isn't the "maximum memory", it's one larger than the 1572 * highest page of the physical address space. It should be 1573 * called something like "Maxphyspage". We may adjust this 1574 * based on ``hw.physmem'' and the results of the memory test. 1575 */ 1576 Maxmem = atop(physmap[physmap_idx + 1]); 1577 1578#ifdef MAXMEM 1579 Maxmem = MAXMEM / 4; 1580#endif 1581 1582 /* 1583 * hw.maxmem is a size in bytes; we also allow k, m, and g suffixes 1584 * for the appropriate modifiers. This overrides MAXMEM. 1585 */ 1586 if ((cp = getenv("hw.physmem")) != NULL) { 1587 u_int64_t AllowMem, sanity; 1588 char *ep; 1589 1590 sanity = AllowMem = strtouq(cp, &ep, 0); 1591 if ((ep != cp) && (*ep != 0)) { 1592 switch(*ep) { 1593 case 'g': 1594 case 'G': 1595 AllowMem <<= 10; 1596 case 'm': 1597 case 'M': 1598 AllowMem <<= 10; 1599 case 'k': 1600 case 'K': 1601 AllowMem <<= 10; 1602 break; 1603 default: 1604 AllowMem = sanity = 0; 1605 } 1606 if (AllowMem < sanity) 1607 AllowMem = 0; 1608 } 1609 if (AllowMem == 0) 1610 printf("Ignoring invalid memory size of '%s'\n", cp); 1611 else 1612 Maxmem = atop(AllowMem); 1613 } 1614 1615 if (atop(physmap[physmap_idx + 1]) != Maxmem && 1616 (boothowto & RB_VERBOSE)) 1617 printf("Physical memory use set to %uK\n", Maxmem * 4); 1618 1619 /* 1620 * If Maxmem has been increased beyond what the system has detected, 1621 * extend the last memory segment to the new limit. 1622 */ 1623 if (atop(physmap[physmap_idx + 1]) < Maxmem) 1624 physmap[physmap_idx + 1] = ptoa(Maxmem); 1625 1626 /* call pmap initialization to make new kernel address space */ 1627 pmap_bootstrap(first, 0); 1628 1629 /* 1630 * Size up each available chunk of physical memory. 1631 */ 1632 physmap[0] = PAGE_SIZE; /* mask off page 0 */ 1633 pa_indx = 0; 1634 phys_avail[pa_indx++] = physmap[0]; 1635 phys_avail[pa_indx] = physmap[0]; 1636#if 0 1637 pte = (pt_entry_t)vtopte(KERNBASE); 1638#else 1639 pte = (pt_entry_t)CMAP1; 1640#endif 1641 1642 /* 1643 * physmap is in bytes, so when converting to page boundaries, 1644 * round up the start address and round down the end address. 1645 */ 1646 for (i = 0; i <= physmap_idx; i += 2) { 1647 vm_offset_t end; 1648 1649 end = ptoa(Maxmem); 1650 if (physmap[i + 1] < end) 1651 end = trunc_page(physmap[i + 1]); 1652 for (pa = round_page(physmap[i]); pa < end; pa += PAGE_SIZE) { 1653 int tmp, page_bad; 1654#if 0 1655 int *ptr = 0; 1656#else 1657 int *ptr = (int *)CADDR1; 1658#endif 1659 1660 /* 1661 * block out kernel memory as not available. 1662 */ 1663 if (pa >= 0x100000 && pa < first) 1664 continue; 1665 1666 page_bad = FALSE; 1667 1668 /* 1669 * map page into kernel: valid, read/write,non-cacheable 1670 */ 1671 *pte = pa | PG_V | PG_RW | PG_N; 1672 invltlb(); 1673 1674 tmp = *(int *)ptr; 1675 /* 1676 * Test for alternating 1's and 0's 1677 */ 1678 *(volatile int *)ptr = 0xaaaaaaaa; 1679 if (*(volatile int *)ptr != 0xaaaaaaaa) { 1680 page_bad = TRUE; 1681 } 1682 /* 1683 * Test for alternating 0's and 1's 1684 */ 1685 *(volatile int *)ptr = 0x55555555; 1686 if (*(volatile int *)ptr != 0x55555555) { 1687 page_bad = TRUE; 1688 } 1689 /* 1690 * Test for all 1's 1691 */ 1692 *(volatile int *)ptr = 0xffffffff; 1693 if (*(volatile int *)ptr != 0xffffffff) { 1694 page_bad = TRUE; 1695 } 1696 /* 1697 * Test for all 0's 1698 */ 1699 *(volatile int *)ptr = 0x0; 1700 if (*(volatile int *)ptr != 0x0) { 1701 page_bad = TRUE; 1702 } 1703 /* 1704 * Restore original value. 1705 */ 1706 *(int *)ptr = tmp; 1707 1708 /* 1709 * Adjust array of valid/good pages. 1710 */ 1711 if (page_bad == TRUE) { 1712 continue; 1713 } 1714 /* 1715 * If this good page is a continuation of the 1716 * previous set of good pages, then just increase 1717 * the end pointer. Otherwise start a new chunk. 1718 * Note that "end" points one higher than end, 1719 * making the range >= start and < end. 1720 * If we're also doing a speculative memory 1721 * test and we at or past the end, bump up Maxmem 1722 * so that we keep going. The first bad page 1723 * will terminate the loop. 1724 */ 1725 if (phys_avail[pa_indx] == pa) { 1726 phys_avail[pa_indx] += PAGE_SIZE; 1727 } else { 1728 pa_indx++; 1729 if (pa_indx == PHYS_AVAIL_ARRAY_END) { 1730 printf("Too many holes in the physical address space, giving up\n"); 1731 pa_indx--; 1732 break; 1733 } 1734 phys_avail[pa_indx++] = pa; /* start */ 1735 phys_avail[pa_indx] = pa + PAGE_SIZE; /* end */ 1736 } 1737 physmem++; 1738 } 1739 } 1740 *pte = 0; 1741 invltlb(); 1742 1743 /* 1744 * XXX 1745 * The last chunk must contain at least one page plus the message 1746 * buffer to avoid complicating other code (message buffer address 1747 * calculation, etc.). 1748 */ 1749 while (phys_avail[pa_indx - 1] + PAGE_SIZE + 1750 round_page(MSGBUF_SIZE) >= phys_avail[pa_indx]) { 1751 physmem -= atop(phys_avail[pa_indx] - phys_avail[pa_indx - 1]); 1752 phys_avail[pa_indx--] = 0; 1753 phys_avail[pa_indx--] = 0; 1754 } 1755 1756 Maxmem = atop(phys_avail[pa_indx]); 1757 1758 /* Trim off space for the message buffer. */ 1759 phys_avail[pa_indx] -= round_page(MSGBUF_SIZE); 1760 1761 avail_end = phys_avail[pa_indx]; 1762} 1763 1764void 1765init386(first) 1766 int first; 1767{ 1768 int x; 1769 struct gate_descriptor *gdp; 1770 int gsel_tss; 1771#ifndef SMP 1772 /* table descriptors - used to load tables by microp */ 1773 struct region_descriptor r_gdt, r_idt; 1774#endif 1775 int off; 1776 1777 /* 1778 * Prevent lowering of the ipl if we call tsleep() early. 1779 */ 1780 safepri = cpl; 1781 1782 proc0.p_addr = proc0paddr; 1783 1784 atdevbase = ISA_HOLE_START + KERNBASE; 1785 1786 if (bootinfo.bi_modulep) { 1787 preload_metadata = (caddr_t)bootinfo.bi_modulep + KERNBASE; 1788 preload_bootstrap_relocate(KERNBASE); 1789 } 1790 if (bootinfo.bi_envp) 1791 kern_envp = (caddr_t)bootinfo.bi_envp + KERNBASE; 1792 1793 /* 1794 * make gdt memory segments, the code segment goes up to end of the 1795 * page with etext in it, the data segment goes to the end of 1796 * the address space 1797 */ 1798 /* 1799 * XXX text protection is temporarily (?) disabled. The limit was 1800 * i386_btop(round_page(etext)) - 1. 1801 */ 1802 gdt_segs[GCODE_SEL].ssd_limit = i386_btop(0) - 1; 1803 gdt_segs[GDATA_SEL].ssd_limit = i386_btop(0) - 1; 1804#ifdef SMP 1805 gdt_segs[GPRIV_SEL].ssd_limit = 1806 i386_btop(sizeof(struct privatespace)) - 1; 1807 gdt_segs[GPRIV_SEL].ssd_base = (int) &SMP_prvspace[0]; 1808 gdt_segs[GPROC0_SEL].ssd_base = 1809 (int) &SMP_prvspace[0].globaldata.gd_common_tss; 1810 SMP_prvspace[0].globaldata.gd_prvspace = &SMP_prvspace[0]; 1811#else 1812 gdt_segs[GPRIV_SEL].ssd_limit = i386_btop(0) - 1; 1813 gdt_segs[GPROC0_SEL].ssd_base = (int) &common_tss; 1814#endif 1815 1816 for (x = 0; x < NGDT; x++) { 1817#ifdef BDE_DEBUGGER 1818 /* avoid overwriting db entries with APM ones */ 1819 if (x >= GAPMCODE32_SEL && x <= GAPMDATA_SEL) 1820 continue; 1821#endif 1822 ssdtosd(&gdt_segs[x], &gdt[x].sd); 1823 } 1824 1825 r_gdt.rd_limit = NGDT * sizeof(gdt[0]) - 1; 1826 r_gdt.rd_base = (int) gdt; 1827 lgdt(&r_gdt); 1828 1829 /* make ldt memory segments */ 1830 /* 1831 * The data segment limit must not cover the user area because we 1832 * don't want the user area to be writable in copyout() etc. (page 1833 * level protection is lost in kernel mode on 386's). Also, we 1834 * don't want the user area to be writable directly (page level 1835 * protection of the user area is not available on 486's with 1836 * CR0_WP set, because there is no user-read/kernel-write mode). 1837 * 1838 * XXX - VM_MAXUSER_ADDRESS is an end address, not a max. And it 1839 * should be spelled ...MAX_USER... 1840 */ 1841#define VM_END_USER_RW_ADDRESS VM_MAXUSER_ADDRESS 1842 /* 1843 * The code segment limit has to cover the user area until we move 1844 * the signal trampoline out of the user area. This is safe because 1845 * the code segment cannot be written to directly. 1846 */ 1847#define VM_END_USER_R_ADDRESS (VM_END_USER_RW_ADDRESS + UPAGES * PAGE_SIZE) 1848 ldt_segs[LUCODE_SEL].ssd_limit = i386_btop(VM_END_USER_R_ADDRESS) - 1; 1849 ldt_segs[LUDATA_SEL].ssd_limit = i386_btop(VM_END_USER_RW_ADDRESS) - 1; 1850 for (x = 0; x < sizeof ldt_segs / sizeof ldt_segs[0]; x++) 1851 ssdtosd(&ldt_segs[x], &ldt[x].sd); 1852 1853 _default_ldt = GSEL(GLDT_SEL, SEL_KPL); 1854 lldt(_default_ldt); 1855#ifdef USER_LDT 1856 currentldt = _default_ldt; 1857#endif 1858 1859 /* exceptions */ 1860 for (x = 0; x < NIDT; x++) 1861 setidt(x, &IDTVEC(rsvd), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1862 setidt(0, &IDTVEC(div), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1863 setidt(1, &IDTVEC(dbg), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1864 setidt(2, &IDTVEC(nmi), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1865 setidt(3, &IDTVEC(bpt), SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL)); 1866 setidt(4, &IDTVEC(ofl), SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL)); 1867 setidt(5, &IDTVEC(bnd), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1868 setidt(6, &IDTVEC(ill), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1869 setidt(7, &IDTVEC(dna), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1870 setidt(8, 0, SDT_SYSTASKGT, SEL_KPL, GSEL(GPANIC_SEL, SEL_KPL)); 1871 setidt(9, &IDTVEC(fpusegm), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1872 setidt(10, &IDTVEC(tss), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1873 setidt(11, &IDTVEC(missing), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1874 setidt(12, &IDTVEC(stk), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1875 setidt(13, &IDTVEC(prot), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1876 setidt(14, &IDTVEC(page), SDT_SYS386IGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1877 setidt(15, &IDTVEC(rsvd), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1878 setidt(16, &IDTVEC(fpu), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1879 setidt(17, &IDTVEC(align), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1880 setidt(18, &IDTVEC(mchk), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1881 setidt(0x80, &IDTVEC(int0x80_syscall), 1882 SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL)); 1883 1884 r_idt.rd_limit = sizeof(idt0) - 1; 1885 r_idt.rd_base = (int) idt; 1886 lidt(&r_idt); 1887 1888 /* 1889 * Initialize the console before we print anything out. 1890 */ 1891 cninit(); 1892 1893#include "isa.h" 1894#if NISA >0 1895 isa_defaultirq(); 1896#endif 1897 rand_initialize(); 1898 1899#ifdef DDB 1900 kdb_init(); 1901 if (boothowto & RB_KDB) 1902 Debugger("Boot flags requested debugger"); 1903#endif 1904 1905 finishidentcpu(); /* Final stage of CPU initialization */ 1906 setidt(6, &IDTVEC(ill), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1907 setidt(13, &IDTVEC(prot), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1908 initializecpu(); /* Initialize CPU registers */ 1909 1910 /* make an initial tss so cpu can get interrupt stack on syscall! */ 1911 common_tss.tss_esp0 = (int) proc0.p_addr + UPAGES*PAGE_SIZE - 16; 1912 common_tss.tss_ss0 = GSEL(GDATA_SEL, SEL_KPL) ; 1913 gsel_tss = GSEL(GPROC0_SEL, SEL_KPL); 1914 private_tss = 0; 1915 tss_gdt = &gdt[GPROC0_SEL].sd; 1916 common_tssd = *tss_gdt; 1917 common_tss.tss_ioopt = (sizeof common_tss) << 16; 1918 ltr(gsel_tss); 1919 1920 dblfault_tss.tss_esp = dblfault_tss.tss_esp0 = dblfault_tss.tss_esp1 = 1921 dblfault_tss.tss_esp2 = (int) &dblfault_stack[sizeof(dblfault_stack)]; 1922 dblfault_tss.tss_ss = dblfault_tss.tss_ss0 = dblfault_tss.tss_ss1 = 1923 dblfault_tss.tss_ss2 = GSEL(GDATA_SEL, SEL_KPL); 1924 dblfault_tss.tss_cr3 = (int)IdlePTD; 1925 dblfault_tss.tss_eip = (int) dblfault_handler; 1926 dblfault_tss.tss_eflags = PSL_KERNEL; 1927 dblfault_tss.tss_ds = dblfault_tss.tss_es = 1928 dblfault_tss.tss_gs = GSEL(GDATA_SEL, SEL_KPL); 1929 dblfault_tss.tss_fs = GSEL(GPRIV_SEL, SEL_KPL); 1930 dblfault_tss.tss_cs = GSEL(GCODE_SEL, SEL_KPL); 1931 dblfault_tss.tss_ldt = GSEL(GLDT_SEL, SEL_KPL); 1932 1933 vm86_initialize(); 1934 getmemsize(first); 1935 1936 /* now running on new page tables, configured,and u/iom is accessible */ 1937 1938 /* Map the message buffer. */ 1939 for (off = 0; off < round_page(MSGBUF_SIZE); off += PAGE_SIZE) 1940 pmap_kenter((vm_offset_t)msgbufp + off, avail_end + off); 1941 1942 msgbufinit(msgbufp, MSGBUF_SIZE); 1943 1944 /* make a call gate to reenter kernel with */ 1945 gdp = &ldt[LSYS5CALLS_SEL].gd; 1946 1947 x = (int) &IDTVEC(syscall); 1948 gdp->gd_looffset = x++; 1949 gdp->gd_selector = GSEL(GCODE_SEL,SEL_KPL); 1950 gdp->gd_stkcpy = 1; 1951 gdp->gd_type = SDT_SYS386CGT; 1952 gdp->gd_dpl = SEL_UPL; 1953 gdp->gd_p = 1; 1954 gdp->gd_hioffset = ((int) &IDTVEC(syscall)) >>16; 1955 1956 /* XXX does this work? */ 1957 ldt[LBSDICALLS_SEL] = ldt[LSYS5CALLS_SEL]; 1958 ldt[LSOL26CALLS_SEL] = ldt[LSYS5CALLS_SEL]; 1959 1960 /* transfer to user mode */ 1961 1962 _ucodesel = LSEL(LUCODE_SEL, SEL_UPL); 1963 _udatasel = LSEL(LUDATA_SEL, SEL_UPL); 1964 1965 /* setup proc 0's pcb */ 1966 proc0.p_addr->u_pcb.pcb_flags = 0; 1967 proc0.p_addr->u_pcb.pcb_cr3 = (int)IdlePTD; 1968#ifdef SMP 1969 proc0.p_addr->u_pcb.pcb_mpnest = 1; 1970#endif 1971 proc0.p_addr->u_pcb.pcb_ext = 0; 1972} 1973 1974#if defined(I586_CPU) && !defined(NO_F00F_HACK) 1975static void f00f_hack(void *unused); 1976SYSINIT(f00f_hack, SI_SUB_INTRINSIC, SI_ORDER_FIRST, f00f_hack, NULL); 1977 1978static void 1979f00f_hack(void *unused) { 1980 struct gate_descriptor *new_idt; 1981#ifndef SMP 1982 struct region_descriptor r_idt; 1983#endif 1984 vm_offset_t tmp; 1985 1986 if (!has_f00f_bug) 1987 return; 1988 1989 printf("Intel Pentium detected, installing workaround for F00F bug\n"); 1990 1991 r_idt.rd_limit = sizeof(idt0) - 1; 1992 1993 tmp = kmem_alloc(kernel_map, PAGE_SIZE * 2); 1994 if (tmp == 0) 1995 panic("kmem_alloc returned 0"); 1996 if (((unsigned int)tmp & (PAGE_SIZE-1)) != 0) 1997 panic("kmem_alloc returned non-page-aligned memory"); 1998 /* Put the first seven entries in the lower page */ 1999 new_idt = (struct gate_descriptor*)(tmp + PAGE_SIZE - (7*8)); 2000 bcopy(idt, new_idt, sizeof(idt0)); 2001 r_idt.rd_base = (int)new_idt; 2002 lidt(&r_idt); 2003 idt = new_idt; 2004 if (vm_map_protect(kernel_map, tmp, tmp + PAGE_SIZE, 2005 VM_PROT_READ, FALSE) != KERN_SUCCESS) 2006 panic("vm_map_protect failed"); 2007 return; 2008} 2009#endif /* defined(I586_CPU) && !NO_F00F_HACK */ 2010 2011int 2012ptrace_set_pc(p, addr) 2013 struct proc *p; 2014 unsigned long addr; 2015{ 2016 p->p_md.md_regs->tf_eip = addr; 2017 return (0); 2018} 2019 2020int 2021ptrace_single_step(p) 2022 struct proc *p; 2023{ 2024 p->p_md.md_regs->tf_eflags |= PSL_T; 2025 return (0); 2026} 2027 2028int ptrace_read_u_check(p, addr, len) 2029 struct proc *p; 2030 vm_offset_t addr; 2031 size_t len; 2032{ 2033 vm_offset_t gap; 2034 2035 if ((vm_offset_t) (addr + len) < addr) 2036 return EPERM; 2037 if ((vm_offset_t) (addr + len) <= sizeof(struct user)) 2038 return 0; 2039 2040 gap = (char *) p->p_md.md_regs - (char *) p->p_addr; 2041 2042 if ((vm_offset_t) addr < gap) 2043 return EPERM; 2044 if ((vm_offset_t) (addr + len) <= 2045 (vm_offset_t) (gap + sizeof(struct trapframe))) 2046 return 0; 2047 return EPERM; 2048} 2049 2050int ptrace_write_u(p, off, data) 2051 struct proc *p; 2052 vm_offset_t off; 2053 long data; 2054{ 2055 struct trapframe frame_copy; 2056 vm_offset_t min; 2057 struct trapframe *tp; 2058 2059 /* 2060 * Privileged kernel state is scattered all over the user area. 2061 * Only allow write access to parts of regs and to fpregs. 2062 */ 2063 min = (char *)p->p_md.md_regs - (char *)p->p_addr; 2064 if (off >= min && off <= min + sizeof(struct trapframe) - sizeof(int)) { 2065 tp = p->p_md.md_regs; 2066 frame_copy = *tp; 2067 *(int *)((char *)&frame_copy + (off - min)) = data; 2068 if (!EFL_SECURE(frame_copy.tf_eflags, tp->tf_eflags) || 2069 !CS_SECURE(frame_copy.tf_cs)) 2070 return (EINVAL); 2071 *(int*)((char *)p->p_addr + off) = data; 2072 return (0); 2073 } 2074 min = offsetof(struct user, u_pcb) + offsetof(struct pcb, pcb_savefpu); 2075 if (off >= min && off <= min + sizeof(struct save87) - sizeof(int)) { 2076 *(int*)((char *)p->p_addr + off) = data; 2077 return (0); 2078 } 2079 return (EFAULT); 2080} 2081 2082int 2083fill_regs(p, regs) 2084 struct proc *p; 2085 struct reg *regs; 2086{ 2087 struct pcb *pcb; 2088 struct trapframe *tp; 2089 2090 tp = p->p_md.md_regs; 2091 regs->r_fs = tp->tf_fs; 2092 regs->r_es = tp->tf_es; 2093 regs->r_ds = tp->tf_ds; 2094 regs->r_edi = tp->tf_edi; 2095 regs->r_esi = tp->tf_esi; 2096 regs->r_ebp = tp->tf_ebp; 2097 regs->r_ebx = tp->tf_ebx; 2098 regs->r_edx = tp->tf_edx; 2099 regs->r_ecx = tp->tf_ecx; 2100 regs->r_eax = tp->tf_eax; 2101 regs->r_eip = tp->tf_eip; 2102 regs->r_cs = tp->tf_cs; 2103 regs->r_eflags = tp->tf_eflags; 2104 regs->r_esp = tp->tf_esp; 2105 regs->r_ss = tp->tf_ss; 2106 pcb = &p->p_addr->u_pcb; 2107 regs->r_gs = pcb->pcb_gs; 2108 return (0); 2109} 2110 2111int 2112set_regs(p, regs) 2113 struct proc *p; 2114 struct reg *regs; 2115{ 2116 struct pcb *pcb; 2117 struct trapframe *tp; 2118 2119 tp = p->p_md.md_regs; 2120 if (!EFL_SECURE(regs->r_eflags, tp->tf_eflags) || 2121 !CS_SECURE(regs->r_cs)) 2122 return (EINVAL); 2123 tp->tf_fs = regs->r_fs; 2124 tp->tf_es = regs->r_es; 2125 tp->tf_ds = regs->r_ds; 2126 tp->tf_edi = regs->r_edi; 2127 tp->tf_esi = regs->r_esi; 2128 tp->tf_ebp = regs->r_ebp; 2129 tp->tf_ebx = regs->r_ebx; 2130 tp->tf_edx = regs->r_edx; 2131 tp->tf_ecx = regs->r_ecx; 2132 tp->tf_eax = regs->r_eax; 2133 tp->tf_eip = regs->r_eip; 2134 tp->tf_cs = regs->r_cs; 2135 tp->tf_eflags = regs->r_eflags; 2136 tp->tf_esp = regs->r_esp; 2137 tp->tf_ss = regs->r_ss; 2138 pcb = &p->p_addr->u_pcb; 2139 pcb->pcb_gs = regs->r_gs; 2140 return (0); 2141} 2142 2143int 2144fill_fpregs(p, fpregs) 2145 struct proc *p; 2146 struct fpreg *fpregs; 2147{ 2148 bcopy(&p->p_addr->u_pcb.pcb_savefpu, fpregs, sizeof *fpregs); 2149 return (0); 2150} 2151 2152int 2153set_fpregs(p, fpregs) 2154 struct proc *p; 2155 struct fpreg *fpregs; 2156{ 2157 bcopy(fpregs, &p->p_addr->u_pcb.pcb_savefpu, sizeof *fpregs); 2158 return (0); 2159} 2160 2161int 2162fill_dbregs(p, dbregs) 2163 struct proc *p; 2164 struct dbreg *dbregs; 2165{ 2166 struct pcb *pcb; 2167 2168 pcb = &p->p_addr->u_pcb; 2169 dbregs->dr0 = pcb->pcb_dr0; 2170 dbregs->dr1 = pcb->pcb_dr1; 2171 dbregs->dr2 = pcb->pcb_dr2; 2172 dbregs->dr3 = pcb->pcb_dr3; 2173 dbregs->dr4 = 0; 2174 dbregs->dr5 = 0; 2175 dbregs->dr6 = pcb->pcb_dr6; 2176 dbregs->dr7 = pcb->pcb_dr7; 2177 return (0); 2178} 2179 2180int 2181set_dbregs(p, dbregs) 2182 struct proc *p; 2183 struct dbreg *dbregs; 2184{ 2185 struct pcb *pcb; 2186 2187 pcb = &p->p_addr->u_pcb; 2188 2189 /* 2190 * Don't let a process set a breakpoint that is not within the 2191 * process's address space. If a process could do this, it 2192 * could halt the system by setting a breakpoint in the kernel 2193 * (if ddb was enabled). Thus, we need to check to make sure 2194 * that no breakpoints are being enabled for addresses outside 2195 * process's address space, unless, perhaps, we were called by 2196 * uid 0. 2197 * 2198 * XXX - what about when the watched area of the user's 2199 * address space is written into from within the kernel 2200 * ... wouldn't that still cause a breakpoint to be generated 2201 * from within kernel mode? 2202 */ 2203 2204 if (p->p_ucred->cr_uid != 0) { 2205 if (dbregs->dr7 & 0x3) { 2206 /* dr0 is enabled */ 2207 if (dbregs->dr0 >= VM_MAXUSER_ADDRESS) 2208 return (EINVAL); 2209 } 2210 2211 if (dbregs->dr7 & (0x3<<2)) { 2212 /* dr1 is enabled */ 2213 if (dbregs->dr1 >= VM_MAXUSER_ADDRESS) 2214 return (EINVAL); 2215 } 2216 2217 if (dbregs->dr7 & (0x3<<4)) { 2218 /* dr2 is enabled */ 2219 if (dbregs->dr2 >= VM_MAXUSER_ADDRESS) 2220 return (EINVAL); 2221 } 2222 2223 if (dbregs->dr7 & (0x3<<6)) { 2224 /* dr3 is enabled */ 2225 if (dbregs->dr3 >= VM_MAXUSER_ADDRESS) 2226 return (EINVAL); 2227 } 2228 } 2229 2230 pcb->pcb_dr0 = dbregs->dr0; 2231 pcb->pcb_dr1 = dbregs->dr1; 2232 pcb->pcb_dr2 = dbregs->dr2; 2233 pcb->pcb_dr3 = dbregs->dr3; 2234 pcb->pcb_dr6 = dbregs->dr6; 2235 pcb->pcb_dr7 = dbregs->dr7; 2236 2237 pcb->pcb_flags |= PCB_DBREGS; 2238 2239 return (0); 2240} 2241 2242#ifndef DDB 2243void 2244Debugger(const char *msg) 2245{ 2246 printf("Debugger(\"%s\") called.\n", msg); 2247} 2248#endif /* no DDB */ 2249 2250#include <sys/disklabel.h> 2251 2252/* 2253 * Determine the size of the transfer, and make sure it is 2254 * within the boundaries of the partition. Adjust transfer 2255 * if needed, and signal errors or early completion. 2256 */ 2257int 2258bounds_check_with_label(struct buf *bp, struct disklabel *lp, int wlabel) 2259{ 2260 struct partition *p = lp->d_partitions + dkpart(bp->b_dev); 2261 int labelsect = lp->d_partitions[0].p_offset; 2262 int maxsz = p->p_size, 2263 sz = (bp->b_bcount + DEV_BSIZE - 1) >> DEV_BSHIFT; 2264 2265 /* overwriting disk label ? */ 2266 /* XXX should also protect bootstrap in first 8K */ 2267 if (bp->b_blkno + p->p_offset <= LABELSECTOR + labelsect && 2268#if LABELSECTOR != 0 2269 bp->b_blkno + p->p_offset + sz > LABELSECTOR + labelsect && 2270#endif 2271 (bp->b_flags & B_READ) == 0 && wlabel == 0) { 2272 bp->b_error = EROFS; 2273 goto bad; 2274 } 2275 2276#if defined(DOSBBSECTOR) && defined(notyet) 2277 /* overwriting master boot record? */ 2278 if (bp->b_blkno + p->p_offset <= DOSBBSECTOR && 2279 (bp->b_flags & B_READ) == 0 && wlabel == 0) { 2280 bp->b_error = EROFS; 2281 goto bad; 2282 } 2283#endif 2284 2285 /* beyond partition? */ 2286 if (bp->b_blkno < 0 || bp->b_blkno + sz > maxsz) { 2287 /* if exactly at end of disk, return an EOF */ 2288 if (bp->b_blkno == maxsz) { 2289 bp->b_resid = bp->b_bcount; 2290 return(0); 2291 } 2292 /* or truncate if part of it fits */ 2293 sz = maxsz - bp->b_blkno; 2294 if (sz <= 0) { 2295 bp->b_error = EINVAL; 2296 goto bad; 2297 } 2298 bp->b_bcount = sz << DEV_BSHIFT; 2299 } 2300 2301 bp->b_pblkno = bp->b_blkno + p->p_offset; 2302 return(1); 2303 2304bad: 2305 bp->b_flags |= B_ERROR; 2306 return(-1); 2307} 2308 2309#ifdef DDB 2310 2311/* 2312 * Provide inb() and outb() as functions. They are normally only 2313 * available as macros calling inlined functions, thus cannot be 2314 * called inside DDB. 2315 * 2316 * The actual code is stolen from <machine/cpufunc.h>, and de-inlined. 2317 */ 2318 2319#undef inb 2320#undef outb 2321 2322/* silence compiler warnings */ 2323u_char inb(u_int); 2324void outb(u_int, u_char); 2325 2326u_char 2327inb(u_int port) 2328{ 2329 u_char data; 2330 /* 2331 * We use %%dx and not %1 here because i/o is done at %dx and not at 2332 * %edx, while gcc generates inferior code (movw instead of movl) 2333 * if we tell it to load (u_short) port. 2334 */ 2335 __asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port)); 2336 return (data); 2337} 2338 2339void 2340outb(u_int port, u_char data) 2341{ 2342 u_char al; 2343 /* 2344 * Use an unnecessary assignment to help gcc's register allocator. 2345 * This make a large difference for gcc-1.40 and a tiny difference 2346 * for gcc-2.6.0. For gcc-1.40, al had to be ``asm("ax")'' for 2347 * best results. gcc-2.6.0 can't handle this. 2348 */ 2349 al = data; 2350 __asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port)); 2351} 2352 2353#endif /* DDB */ 2354