machdep.c revision 53648
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 53648 1999-11-24 01:03:08Z archie $ 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/proc.h> 65#include <sys/buf.h> 66#include <sys/reboot.h> 67#include <sys/callout.h> 68#include <sys/malloc.h> 69#include <sys/mbuf.h> 70#include <sys/msgbuf.h> 71#include <sys/sysent.h> 72#include <sys/sysctl.h> 73#include <sys/vmmeter.h> 74#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 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 = (p->p_sigstk.ss_flags & SS_ONSTACK) ? 1 : 0; 487 488 /* Allocate and validate space for the signal handler context. */ 489 if ((p->p_flag & P_ALTSTACK) && !oonstack && 490 SIGISMEMBER(psp->ps_sigonstack, sig)) { 491 fp = (struct osigframe *)(p->p_sigstk.ss_sp + 492 p->p_sigstk.ss_size - sizeof(struct osigframe)); 493 p->p_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), VM_PROT_WRITE)) { 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_addr = (register_t *)regs->tf_err; 537 sf.sf_ahu.sf_handler = catcher; 538 } 539 540 /* save scratch registers */ 541 sf.sf_siginfo.si_sc.sc_eax = regs->tf_eax; 542 sf.sf_siginfo.si_sc.sc_ebx = regs->tf_ebx; 543 sf.sf_siginfo.si_sc.sc_ecx = regs->tf_ecx; 544 sf.sf_siginfo.si_sc.sc_edx = regs->tf_edx; 545 sf.sf_siginfo.si_sc.sc_esi = regs->tf_esi; 546 sf.sf_siginfo.si_sc.sc_edi = regs->tf_edi; 547 sf.sf_siginfo.si_sc.sc_cs = regs->tf_cs; 548 sf.sf_siginfo.si_sc.sc_ds = regs->tf_ds; 549 sf.sf_siginfo.si_sc.sc_ss = regs->tf_ss; 550 sf.sf_siginfo.si_sc.sc_es = regs->tf_es; 551 sf.sf_siginfo.si_sc.sc_fs = regs->tf_fs; 552 sf.sf_siginfo.si_sc.sc_gs = rgs(); 553 sf.sf_siginfo.si_sc.sc_isp = regs->tf_isp; 554 555 /* Build the signal context to be used by sigreturn. */ 556 sf.sf_siginfo.si_sc.sc_onstack = oonstack; 557 SIG2OSIG(*mask, sf.sf_siginfo.si_sc.sc_mask); 558 sf.sf_siginfo.si_sc.sc_sp = regs->tf_esp; 559 sf.sf_siginfo.si_sc.sc_fp = regs->tf_ebp; 560 sf.sf_siginfo.si_sc.sc_pc = regs->tf_eip; 561 sf.sf_siginfo.si_sc.sc_ps = regs->tf_eflags; 562 sf.sf_siginfo.si_sc.sc_trapno = regs->tf_trapno; 563 sf.sf_siginfo.si_sc.sc_err = regs->tf_err; 564 565 /* 566 * If we're a vm86 process, we want to save the segment registers. 567 * We also change eflags to be our emulated eflags, not the actual 568 * eflags. 569 */ 570 if (regs->tf_eflags & PSL_VM) { 571 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs; 572 struct vm86_kernel *vm86 = &p->p_addr->u_pcb.pcb_ext->ext_vm86; 573 574 sf.sf_siginfo.si_sc.sc_gs = tf->tf_vm86_gs; 575 sf.sf_siginfo.si_sc.sc_fs = tf->tf_vm86_fs; 576 sf.sf_siginfo.si_sc.sc_es = tf->tf_vm86_es; 577 sf.sf_siginfo.si_sc.sc_ds = tf->tf_vm86_ds; 578 579 if (vm86->vm86_has_vme == 0) 580 sf.sf_siginfo.si_sc.sc_ps = 581 (tf->tf_eflags & ~(PSL_VIF | PSL_VIP)) 582 | (vm86->vm86_eflags & (PSL_VIF | PSL_VIP)); 583 /* see sendsig for comment */ 584 tf->tf_eflags &= ~(PSL_VM|PSL_NT|PSL_T|PSL_VIF|PSL_VIP); 585 } 586 587 /* Copy the sigframe out to the user's stack. */ 588 if (copyout(&sf, fp, sizeof(struct osigframe)) != 0) { 589 /* 590 * Something is wrong with the stack pointer. 591 * ...Kill the process. 592 */ 593 sigexit(p, SIGILL); 594 } 595 596 regs->tf_esp = (int)fp; 597 regs->tf_eip = PS_STRINGS - oszsigcode; 598 regs->tf_cs = _ucodesel; 599 regs->tf_ds = _udatasel; 600 regs->tf_es = _udatasel; 601 regs->tf_fs = _udatasel; 602 load_gs(_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 = curproc; 614 struct trapframe *regs; 615 struct sigacts *psp = p->p_sigacts; 616 struct sigframe sf, *sfp; 617 int oonstack; 618 619 if (SIGISMEMBER(psp->ps_osigset, sig)) { 620 osendsig(catcher, sig, mask, code); 621 return; 622 } 623 624 regs = p->p_md.md_regs; 625 oonstack = (p->p_sigstk.ss_flags & SS_ONSTACK) ? 1 : 0; 626 627 /* save user context */ 628 bzero(&sf, sizeof(struct sigframe)); 629 sf.sf_uc.uc_sigmask = *mask; 630 sf.sf_uc.uc_stack = p->p_sigstk; 631 sf.sf_uc.uc_mcontext.mc_onstack = oonstack; 632 sf.sf_uc.uc_mcontext.mc_gs = rgs(); 633 bcopy(regs, &sf.sf_uc.uc_mcontext.mc_fs, sizeof(struct trapframe)); 634 635 /* Allocate and validate space for the signal handler context. */ 636 if ((p->p_flag & P_ALTSTACK) != 0 && !oonstack && 637 SIGISMEMBER(psp->ps_sigonstack, sig)) { 638 sfp = (struct sigframe *)(p->p_sigstk.ss_sp + 639 p->p_sigstk.ss_size - sizeof(struct sigframe)); 640 p->p_sigstk.ss_flags |= SS_ONSTACK; 641 } 642 else 643 sfp = (struct sigframe *)regs->tf_esp - 1; 644 645 /* 646 * grow() will return FALSE if the sfp will not fit inside the stack 647 * and the stack can not be grown. useracc will return FALSE if 648 * access is denied. 649 */ 650 if (grow_stack(p, (int)sfp) == FALSE || 651 !useracc((caddr_t)sfp, sizeof(struct sigframe), VM_PROT_WRITE)) { 652 /* 653 * Process has trashed its stack; give it an illegal 654 * instruction to halt it in its tracks. 655 */ 656#ifdef DEBUG 657 printf("process %d has trashed its stack\n", p->p_pid); 658#endif 659 SIGACTION(p, SIGILL) = SIG_DFL; 660 SIGDELSET(p->p_sigignore, SIGILL); 661 SIGDELSET(p->p_sigcatch, SIGILL); 662 SIGDELSET(p->p_sigmask, SIGILL); 663 psignal(p, SIGILL); 664 return; 665 } 666 667 /* Translate the signal is appropriate */ 668 if (p->p_sysent->sv_sigtbl) { 669 if (sig <= p->p_sysent->sv_sigsize) 670 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)]; 671 } 672 673 /* Build the argument list for the signal handler. */ 674 sf.sf_signum = sig; 675 sf.sf_ucontext = (register_t)&sfp->sf_uc; 676 if (SIGISMEMBER(p->p_sigacts->ps_siginfo, sig)) { 677 /* Signal handler installed with SA_SIGINFO. */ 678 sf.sf_siginfo = (register_t)&sfp->sf_si; 679 sf.sf_ahu.sf_action = (__siginfohandler_t *)catcher; 680 681 /* fill siginfo structure */ 682 sf.sf_si.si_signo = sig; 683 sf.sf_si.si_code = code; 684 sf.sf_si.si_addr = (void*)regs->tf_err; 685 } 686 else { 687 /* Old FreeBSD-style arguments. */ 688 sf.sf_siginfo = code; 689 sf.sf_addr = (register_t *)regs->tf_err; 690 sf.sf_ahu.sf_handler = catcher; 691 } 692 693 /* 694 * If we're a vm86 process, we want to save the segment registers. 695 * We also change eflags to be our emulated eflags, not the actual 696 * eflags. 697 */ 698 if (regs->tf_eflags & PSL_VM) { 699 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs; 700 struct vm86_kernel *vm86 = &p->p_addr->u_pcb.pcb_ext->ext_vm86; 701 702 sf.sf_uc.uc_mcontext.mc_gs = tf->tf_vm86_gs; 703 sf.sf_uc.uc_mcontext.mc_fs = tf->tf_vm86_fs; 704 sf.sf_uc.uc_mcontext.mc_es = tf->tf_vm86_es; 705 sf.sf_uc.uc_mcontext.mc_ds = tf->tf_vm86_ds; 706 707 if (vm86->vm86_has_vme == 0) 708 sf.sf_uc.uc_mcontext.mc_eflags = 709 (tf->tf_eflags & ~(PSL_VIF | PSL_VIP)) | 710 (vm86->vm86_eflags & (PSL_VIF | PSL_VIP)); 711 712 /* 713 * We should never have PSL_T set when returning from vm86 714 * mode. It may be set here if we deliver a signal before 715 * getting to vm86 mode, so turn it off. 716 * 717 * Clear PSL_NT to inhibit T_TSSFLT faults on return from 718 * syscalls made by the signal handler. This just avoids 719 * wasting time for our lazy fixup of such faults. PSL_NT 720 * does nothing in vm86 mode, but vm86 programs can set it 721 * almost legitimately in probes for old cpu types. 722 */ 723 tf->tf_eflags &= ~(PSL_VM|PSL_NT|PSL_T|PSL_VIF|PSL_VIP); 724 } 725 726 /* 727 * Copy the sigframe out to the user's stack. 728 */ 729 if (copyout(&sf, sfp, sizeof(struct sigframe)) != 0) { 730 /* 731 * Something is wrong with the stack pointer. 732 * ...Kill the process. 733 */ 734 sigexit(p, SIGILL); 735 } 736 737 regs->tf_esp = (int)sfp; 738 regs->tf_eip = PS_STRINGS - *(p->p_sysent->sv_szsigcode); 739 regs->tf_cs = _ucodesel; 740 regs->tf_ds = _udatasel; 741 regs->tf_es = _udatasel; 742 regs->tf_fs = _udatasel; 743 load_gs(_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 trapframe *regs = p->p_md.md_regs; 768 int eflags; 769 770 scp = uap->sigcntxp; 771 772 if (!useracc((caddr_t)scp, sizeof (struct osigcontext), VM_PROT_READ)) 773 return(EFAULT); 774 775 eflags = scp->sc_ps; 776 if (eflags & PSL_VM) { 777 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs; 778 struct vm86_kernel *vm86; 779 780 /* 781 * if pcb_ext == 0 or vm86_inited == 0, the user hasn't 782 * set up the vm86 area, and we can't enter vm86 mode. 783 */ 784 if (p->p_addr->u_pcb.pcb_ext == 0) 785 return (EINVAL); 786 vm86 = &p->p_addr->u_pcb.pcb_ext->ext_vm86; 787 if (vm86->vm86_inited == 0) 788 return (EINVAL); 789 790 /* go back to user mode if both flags are set */ 791 if ((eflags & PSL_VIP) && (eflags & PSL_VIF)) 792 trapsignal(p, SIGBUS, 0); 793 794 if (vm86->vm86_has_vme) { 795 eflags = (tf->tf_eflags & ~VME_USERCHANGE) | 796 (eflags & VME_USERCHANGE) | PSL_VM; 797 } else { 798 vm86->vm86_eflags = eflags; /* save VIF, VIP */ 799 eflags = (tf->tf_eflags & ~VM_USERCHANGE) | (eflags & VM_USERCHANGE) | PSL_VM; 800 } 801 tf->tf_vm86_ds = scp->sc_ds; 802 tf->tf_vm86_es = scp->sc_es; 803 tf->tf_vm86_fs = scp->sc_fs; 804 tf->tf_vm86_gs = scp->sc_gs; 805 tf->tf_ds = _udatasel; 806 tf->tf_es = _udatasel; 807 tf->tf_fs = _udatasel; 808 } else { 809 /* 810 * Don't allow users to change privileged or reserved flags. 811 */ 812 /* 813 * XXX do allow users to change the privileged flag PSL_RF. 814 * The cpu sets PSL_RF in tf_eflags for faults. Debuggers 815 * should sometimes set it there too. tf_eflags is kept in 816 * the signal context during signal handling and there is no 817 * other place to remember it, so the PSL_RF bit may be 818 * corrupted by the signal handler without us knowing. 819 * Corruption of the PSL_RF bit at worst causes one more or 820 * one less debugger trap, so allowing it is fairly harmless. 821 */ 822 if (!EFL_SECURE(eflags & ~PSL_RF, regs->tf_eflags & ~PSL_RF)) { 823 return(EINVAL); 824 } 825 826 /* 827 * Don't allow users to load a valid privileged %cs. Let the 828 * hardware check for invalid selectors, excess privilege in 829 * other selectors, invalid %eip's and invalid %esp's. 830 */ 831 if (!CS_SECURE(scp->sc_cs)) { 832 trapsignal(p, SIGBUS, T_PROTFLT); 833 return(EINVAL); 834 } 835 regs->tf_ds = scp->sc_ds; 836 regs->tf_es = scp->sc_es; 837 regs->tf_fs = scp->sc_fs; 838 } 839 840 /* restore scratch registers */ 841 regs->tf_eax = scp->sc_eax; 842 regs->tf_ebx = scp->sc_ebx; 843 regs->tf_ecx = scp->sc_ecx; 844 regs->tf_edx = scp->sc_edx; 845 regs->tf_esi = scp->sc_esi; 846 regs->tf_edi = scp->sc_edi; 847 regs->tf_cs = scp->sc_cs; 848 regs->tf_ss = scp->sc_ss; 849 regs->tf_isp = scp->sc_isp; 850 851 if (scp->sc_onstack & 01) 852 p->p_sigstk.ss_flags |= SS_ONSTACK; 853 else 854 p->p_sigstk.ss_flags &= ~SS_ONSTACK; 855 856 SIGSETOLD(p->p_sigmask, scp->sc_mask); 857 SIG_CANTMASK(p->p_sigmask); 858 regs->tf_ebp = scp->sc_fp; 859 regs->tf_esp = scp->sc_sp; 860 regs->tf_eip = scp->sc_pc; 861 regs->tf_eflags = eflags; 862 return(EJUSTRETURN); 863} 864 865int 866sigreturn(p, uap) 867 struct proc *p; 868 struct sigreturn_args /* { 869 ucontext_t *sigcntxp; 870 } */ *uap; 871{ 872 struct trapframe *regs; 873 ucontext_t *ucp; 874 int cs, eflags; 875 876 ucp = uap->sigcntxp; 877 878 if (!useracc((caddr_t)ucp, sizeof(struct osigcontext), VM_PROT_READ)) 879 return (EFAULT); 880 if (((struct osigcontext *)ucp)->sc_trapno == 0x01d516) 881 return (osigreturn(p, (struct osigreturn_args *)uap)); 882 883 /* 884 * Since ucp is not an osigcontext but a ucontext_t, we have to 885 * check again if all of it is accessible. A ucontext_t is 886 * much larger, so instead of just checking for the pointer 887 * being valid for the size of an osigcontext, now check for 888 * it being valid for a whole, new-style ucontext_t. 889 */ 890 if (!useracc((caddr_t)ucp, sizeof(ucontext_t), VM_PROT_READ)) 891 return (EFAULT); 892 893 regs = p->p_md.md_regs; 894 eflags = ucp->uc_mcontext.mc_eflags; 895 896 if (eflags & PSL_VM) { 897 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs; 898 struct vm86_kernel *vm86; 899 900 /* 901 * if pcb_ext == 0 or vm86_inited == 0, the user hasn't 902 * set up the vm86 area, and we can't enter vm86 mode. 903 */ 904 if (p->p_addr->u_pcb.pcb_ext == 0) 905 return (EINVAL); 906 vm86 = &p->p_addr->u_pcb.pcb_ext->ext_vm86; 907 if (vm86->vm86_inited == 0) 908 return (EINVAL); 909 910 /* go back to user mode if both flags are set */ 911 if ((eflags & PSL_VIP) && (eflags & PSL_VIF)) 912 trapsignal(p, SIGBUS, 0); 913 914 if (vm86->vm86_has_vme) { 915 eflags = (tf->tf_eflags & ~VME_USERCHANGE) | 916 (eflags & VME_USERCHANGE) | PSL_VM; 917 } else { 918 vm86->vm86_eflags = eflags; /* save VIF, VIP */ 919 eflags = (tf->tf_eflags & ~VM_USERCHANGE) | (eflags & VM_USERCHANGE) | PSL_VM; 920 } 921 bcopy(&ucp->uc_mcontext.mc_fs, tf, sizeof(struct trapframe)); 922 tf->tf_eflags = eflags; 923 tf->tf_vm86_ds = tf->tf_ds; 924 tf->tf_vm86_es = tf->tf_es; 925 tf->tf_vm86_fs = tf->tf_fs; 926 tf->tf_vm86_gs = ucp->uc_mcontext.mc_gs; 927 tf->tf_ds = _udatasel; 928 tf->tf_es = _udatasel; 929 tf->tf_fs = _udatasel; 930 } else { 931 /* 932 * Don't allow users to change privileged or reserved flags. 933 */ 934 /* 935 * XXX do allow users to change the privileged flag PSL_RF. 936 * The cpu sets PSL_RF in tf_eflags for faults. Debuggers 937 * should sometimes set it there too. tf_eflags is kept in 938 * the signal context during signal handling and there is no 939 * other place to remember it, so the PSL_RF bit may be 940 * corrupted by the signal handler without us knowing. 941 * Corruption of the PSL_RF bit at worst causes one more or 942 * one less debugger trap, so allowing it is fairly harmless. 943 */ 944 if (!EFL_SECURE(eflags & ~PSL_RF, regs->tf_eflags & ~PSL_RF)) { 945 printf("sigreturn: eflags = 0x%x\n", eflags); 946 return(EINVAL); 947 } 948 949 /* 950 * Don't allow users to load a valid privileged %cs. Let the 951 * hardware check for invalid selectors, excess privilege in 952 * other selectors, invalid %eip's and invalid %esp's. 953 */ 954 cs = ucp->uc_mcontext.mc_cs; 955 if (!CS_SECURE(cs)) { 956 printf("sigreturn: cs = 0x%x\n", cs); 957 trapsignal(p, SIGBUS, T_PROTFLT); 958 return(EINVAL); 959 } 960 bcopy(&ucp->uc_mcontext.mc_fs, regs, sizeof(struct trapframe)); 961 } 962 963 if (ucp->uc_mcontext.mc_onstack & 1) 964 p->p_sigstk.ss_flags |= SS_ONSTACK; 965 else 966 p->p_sigstk.ss_flags &= ~SS_ONSTACK; 967 968 p->p_sigmask = ucp->uc_sigmask; 969 SIG_CANTMASK(p->p_sigmask); 970 return(EJUSTRETURN); 971} 972 973/* 974 * Machine dependent boot() routine 975 * 976 * I haven't seen anything to put here yet 977 * Possibly some stuff might be grafted back here from boot() 978 */ 979void 980cpu_boot(int howto) 981{ 982} 983 984/* 985 * Shutdown the CPU as much as possible 986 */ 987void 988cpu_halt(void) 989{ 990 for (;;) 991 __asm__ ("hlt"); 992} 993 994/* 995 * Clear registers on exec 996 */ 997void 998setregs(p, entry, stack, ps_strings) 999 struct proc *p; 1000 u_long entry; 1001 u_long stack; 1002 u_long ps_strings; 1003{ 1004 struct trapframe *regs = p->p_md.md_regs; 1005 struct pcb *pcb = &p->p_addr->u_pcb; 1006 1007#ifdef USER_LDT 1008 /* was i386_user_cleanup() in NetBSD */ 1009 if (pcb->pcb_ldt) { 1010 if (pcb == curpcb) { 1011 lldt(_default_ldt); 1012 currentldt = _default_ldt; 1013 } 1014 kmem_free(kernel_map, (vm_offset_t)pcb->pcb_ldt, 1015 pcb->pcb_ldt_len * sizeof(union descriptor)); 1016 pcb->pcb_ldt_len = (int)pcb->pcb_ldt = 0; 1017 } 1018#endif 1019 1020 bzero((char *)regs, sizeof(struct trapframe)); 1021 regs->tf_eip = entry; 1022 regs->tf_esp = stack; 1023 regs->tf_eflags = PSL_USER | (regs->tf_eflags & PSL_T); 1024 regs->tf_ss = _udatasel; 1025 regs->tf_ds = _udatasel; 1026 regs->tf_es = _udatasel; 1027 regs->tf_fs = _udatasel; 1028 regs->tf_cs = _ucodesel; 1029 1030 /* PS_STRINGS value for BSD/OS binaries. It is 0 for non-BSD/OS. */ 1031 regs->tf_ebx = ps_strings; 1032 1033 /* reset %gs as well */ 1034 if (pcb == curpcb) 1035 load_gs(_udatasel); 1036 else 1037 pcb->pcb_gs = _udatasel; 1038 1039 /* 1040 * Initialize the math emulator (if any) for the current process. 1041 * Actually, just clear the bit that says that the emulator has 1042 * been initialized. Initialization is delayed until the process 1043 * traps to the emulator (if it is done at all) mainly because 1044 * emulators don't provide an entry point for initialization. 1045 */ 1046 p->p_addr->u_pcb.pcb_flags &= ~FP_SOFTFP; 1047 1048 /* 1049 * Arrange to trap the next npx or `fwait' instruction (see npx.c 1050 * for why fwait must be trapped at least if there is an npx or an 1051 * emulator). This is mainly to handle the case where npx0 is not 1052 * configured, since the npx routines normally set up the trap 1053 * otherwise. It should be done only at boot time, but doing it 1054 * here allows modifying `npx_exists' for testing the emulator on 1055 * systems with an npx. 1056 */ 1057 load_cr0(rcr0() | CR0_MP | CR0_TS); 1058 1059#if NNPX > 0 1060 /* Initialize the npx (if any) for the current process. */ 1061 npxinit(__INITIAL_NPXCW__); 1062#endif 1063 1064 /* 1065 * XXX - Linux emulator 1066 * Make sure sure edx is 0x0 on entry. Linux binaries depend 1067 * on it. 1068 */ 1069 p->p_retval[1] = 0; 1070} 1071 1072static int 1073sysctl_machdep_adjkerntz SYSCTL_HANDLER_ARGS 1074{ 1075 int error; 1076 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, 1077 req); 1078 if (!error && req->newptr) 1079 resettodr(); 1080 return (error); 1081} 1082 1083SYSCTL_PROC(_machdep, CPU_ADJKERNTZ, adjkerntz, CTLTYPE_INT|CTLFLAG_RW, 1084 &adjkerntz, 0, sysctl_machdep_adjkerntz, "I", ""); 1085 1086SYSCTL_INT(_machdep, CPU_DISRTCSET, disable_rtc_set, 1087 CTLFLAG_RW, &disable_rtc_set, 0, ""); 1088 1089SYSCTL_STRUCT(_machdep, CPU_BOOTINFO, bootinfo, 1090 CTLFLAG_RD, &bootinfo, bootinfo, ""); 1091 1092SYSCTL_INT(_machdep, CPU_WALLCLOCK, wall_cmos_clock, 1093 CTLFLAG_RW, &wall_cmos_clock, 0, ""); 1094 1095/* 1096 * Initialize 386 and configure to run kernel 1097 */ 1098 1099/* 1100 * Initialize segments & interrupt table 1101 */ 1102 1103int _default_ldt; 1104#ifdef SMP 1105union descriptor gdt[NGDT * NCPU]; /* global descriptor table */ 1106#else 1107union descriptor gdt[NGDT]; /* global descriptor table */ 1108#endif 1109static struct gate_descriptor idt0[NIDT]; 1110struct gate_descriptor *idt = &idt0[0]; /* interrupt descriptor table */ 1111union descriptor ldt[NLDT]; /* local descriptor table */ 1112#ifdef SMP 1113/* table descriptors - used to load tables by microp */ 1114struct region_descriptor r_gdt, r_idt; 1115#endif 1116 1117#ifndef SMP 1118extern struct segment_descriptor common_tssd, *tss_gdt; 1119#endif 1120int private_tss; /* flag indicating private tss */ 1121 1122#if defined(I586_CPU) && !defined(NO_F00F_HACK) 1123extern int has_f00f_bug; 1124#endif 1125 1126static struct i386tss dblfault_tss; 1127static char dblfault_stack[PAGE_SIZE]; 1128 1129extern struct user *proc0paddr; 1130 1131 1132/* software prototypes -- in more palatable form */ 1133struct soft_segment_descriptor gdt_segs[] = { 1134/* GNULL_SEL 0 Null Descriptor */ 1135{ 0x0, /* segment base address */ 1136 0x0, /* length */ 1137 0, /* segment type */ 1138 0, /* segment descriptor priority level */ 1139 0, /* segment descriptor present */ 1140 0, 0, 1141 0, /* default 32 vs 16 bit size */ 1142 0 /* limit granularity (byte/page units)*/ }, 1143/* GCODE_SEL 1 Code Descriptor for kernel */ 1144{ 0x0, /* segment base address */ 1145 0xfffff, /* length - all address space */ 1146 SDT_MEMERA, /* segment type */ 1147 0, /* segment descriptor priority level */ 1148 1, /* segment descriptor present */ 1149 0, 0, 1150 1, /* default 32 vs 16 bit size */ 1151 1 /* limit granularity (byte/page units)*/ }, 1152/* GDATA_SEL 2 Data Descriptor for kernel */ 1153{ 0x0, /* segment base address */ 1154 0xfffff, /* length - all address space */ 1155 SDT_MEMRWA, /* segment type */ 1156 0, /* segment descriptor priority level */ 1157 1, /* segment descriptor present */ 1158 0, 0, 1159 1, /* default 32 vs 16 bit size */ 1160 1 /* limit granularity (byte/page units)*/ }, 1161/* GPRIV_SEL 3 SMP Per-Processor Private Data Descriptor */ 1162{ 0x0, /* segment base address */ 1163 0xfffff, /* length - all address space */ 1164 SDT_MEMRWA, /* segment type */ 1165 0, /* segment descriptor priority level */ 1166 1, /* segment descriptor present */ 1167 0, 0, 1168 1, /* default 32 vs 16 bit size */ 1169 1 /* limit granularity (byte/page units)*/ }, 1170/* GPROC0_SEL 4 Proc 0 Tss Descriptor */ 1171{ 1172 0x0, /* segment base address */ 1173 sizeof(struct i386tss)-1,/* length - all address space */ 1174 SDT_SYS386TSS, /* segment type */ 1175 0, /* segment descriptor priority level */ 1176 1, /* segment descriptor present */ 1177 0, 0, 1178 0, /* unused - default 32 vs 16 bit size */ 1179 0 /* limit granularity (byte/page units)*/ }, 1180/* GLDT_SEL 5 LDT Descriptor */ 1181{ (int) ldt, /* segment base address */ 1182 sizeof(ldt)-1, /* length - all address space */ 1183 SDT_SYSLDT, /* segment type */ 1184 SEL_UPL, /* segment descriptor priority level */ 1185 1, /* segment descriptor present */ 1186 0, 0, 1187 0, /* unused - default 32 vs 16 bit size */ 1188 0 /* limit granularity (byte/page units)*/ }, 1189/* GUSERLDT_SEL 6 User LDT Descriptor per process */ 1190{ (int) ldt, /* segment base address */ 1191 (512 * sizeof(union descriptor)-1), /* length */ 1192 SDT_SYSLDT, /* segment type */ 1193 0, /* segment descriptor priority level */ 1194 1, /* segment descriptor present */ 1195 0, 0, 1196 0, /* unused - default 32 vs 16 bit size */ 1197 0 /* limit granularity (byte/page units)*/ }, 1198/* GTGATE_SEL 7 Null Descriptor - Placeholder */ 1199{ 0x0, /* segment base address */ 1200 0x0, /* length - all address space */ 1201 0, /* segment type */ 1202 0, /* segment descriptor priority level */ 1203 0, /* segment descriptor present */ 1204 0, 0, 1205 0, /* default 32 vs 16 bit size */ 1206 0 /* limit granularity (byte/page units)*/ }, 1207/* GBIOSLOWMEM_SEL 8 BIOS access to realmode segment 0x40, must be #8 in GDT */ 1208{ 0x400, /* segment base address */ 1209 0xfffff, /* length */ 1210 SDT_MEMRWA, /* segment type */ 1211 0, /* segment descriptor priority level */ 1212 1, /* segment descriptor present */ 1213 0, 0, 1214 1, /* default 32 vs 16 bit size */ 1215 1 /* limit granularity (byte/page units)*/ }, 1216/* GPANIC_SEL 9 Panic Tss Descriptor */ 1217{ (int) &dblfault_tss, /* segment base address */ 1218 sizeof(struct i386tss)-1,/* length - all address space */ 1219 SDT_SYS386TSS, /* segment type */ 1220 0, /* segment descriptor priority level */ 1221 1, /* segment descriptor present */ 1222 0, 0, 1223 0, /* unused - default 32 vs 16 bit size */ 1224 0 /* limit granularity (byte/page units)*/ }, 1225/* GBIOSCODE32_SEL 10 BIOS 32-bit interface (32bit Code) */ 1226{ 0, /* segment base address (overwritten) */ 1227 0xfffff, /* length */ 1228 SDT_MEMERA, /* segment type */ 1229 0, /* segment descriptor priority level */ 1230 1, /* segment descriptor present */ 1231 0, 0, 1232 0, /* default 32 vs 16 bit size */ 1233 1 /* limit granularity (byte/page units)*/ }, 1234/* GBIOSCODE16_SEL 11 BIOS 32-bit interface (16bit Code) */ 1235{ 0, /* segment base address (overwritten) */ 1236 0xfffff, /* length */ 1237 SDT_MEMERA, /* segment type */ 1238 0, /* segment descriptor priority level */ 1239 1, /* segment descriptor present */ 1240 0, 0, 1241 0, /* default 32 vs 16 bit size */ 1242 1 /* limit granularity (byte/page units)*/ }, 1243/* GBIOSDATA_SEL 12 BIOS 32-bit interface (Data) */ 1244{ 0, /* segment base address (overwritten) */ 1245 0xfffff, /* length */ 1246 SDT_MEMRWA, /* segment type */ 1247 0, /* segment descriptor priority level */ 1248 1, /* segment descriptor present */ 1249 0, 0, 1250 1, /* default 32 vs 16 bit size */ 1251 1 /* limit granularity (byte/page units)*/ }, 1252/* GBIOSUTIL_SEL 13 BIOS 16-bit interface (Utility) */ 1253{ 0, /* segment base address (overwritten) */ 1254 0xfffff, /* length */ 1255 SDT_MEMRWA, /* segment type */ 1256 0, /* segment descriptor priority level */ 1257 1, /* segment descriptor present */ 1258 0, 0, 1259 0, /* default 32 vs 16 bit size */ 1260 1 /* limit granularity (byte/page units)*/ }, 1261/* GBIOSARGS_SEL 14 BIOS 16-bit interface (Arguments) */ 1262{ 0, /* segment base address (overwritten) */ 1263 0xfffff, /* length */ 1264 SDT_MEMRWA, /* segment type */ 1265 0, /* segment descriptor priority level */ 1266 1, /* segment descriptor present */ 1267 0, 0, 1268 0, /* default 32 vs 16 bit size */ 1269 1 /* limit granularity (byte/page units)*/ }, 1270}; 1271 1272static struct soft_segment_descriptor ldt_segs[] = { 1273 /* Null Descriptor - overwritten by call gate */ 1274{ 0x0, /* segment base address */ 1275 0x0, /* length - all address space */ 1276 0, /* segment type */ 1277 0, /* segment descriptor priority level */ 1278 0, /* segment descriptor present */ 1279 0, 0, 1280 0, /* default 32 vs 16 bit size */ 1281 0 /* limit granularity (byte/page units)*/ }, 1282 /* Null Descriptor - overwritten by call gate */ 1283{ 0x0, /* segment base address */ 1284 0x0, /* length - all address space */ 1285 0, /* segment type */ 1286 0, /* segment descriptor priority level */ 1287 0, /* segment descriptor present */ 1288 0, 0, 1289 0, /* default 32 vs 16 bit size */ 1290 0 /* limit granularity (byte/page units)*/ }, 1291 /* Null Descriptor - overwritten by call gate */ 1292{ 0x0, /* segment base address */ 1293 0x0, /* length - all address space */ 1294 0, /* segment type */ 1295 0, /* segment descriptor priority level */ 1296 0, /* segment descriptor present */ 1297 0, 0, 1298 0, /* default 32 vs 16 bit size */ 1299 0 /* limit granularity (byte/page units)*/ }, 1300 /* Code Descriptor for user */ 1301{ 0x0, /* segment base address */ 1302 0xfffff, /* length - all address space */ 1303 SDT_MEMERA, /* segment type */ 1304 SEL_UPL, /* segment descriptor priority level */ 1305 1, /* segment descriptor present */ 1306 0, 0, 1307 1, /* default 32 vs 16 bit size */ 1308 1 /* limit granularity (byte/page units)*/ }, 1309 /* Null Descriptor - overwritten by call gate */ 1310{ 0x0, /* segment base address */ 1311 0x0, /* length - all address space */ 1312 0, /* segment type */ 1313 0, /* segment descriptor priority level */ 1314 0, /* segment descriptor present */ 1315 0, 0, 1316 0, /* default 32 vs 16 bit size */ 1317 0 /* limit granularity (byte/page units)*/ }, 1318 /* Data Descriptor for user */ 1319{ 0x0, /* segment base address */ 1320 0xfffff, /* length - all address space */ 1321 SDT_MEMRWA, /* segment type */ 1322 SEL_UPL, /* segment descriptor priority level */ 1323 1, /* segment descriptor present */ 1324 0, 0, 1325 1, /* default 32 vs 16 bit size */ 1326 1 /* limit granularity (byte/page units)*/ }, 1327}; 1328 1329void 1330setidt(idx, func, typ, dpl, selec) 1331 int idx; 1332 inthand_t *func; 1333 int typ; 1334 int dpl; 1335 int selec; 1336{ 1337 struct gate_descriptor *ip; 1338 1339 ip = idt + idx; 1340 ip->gd_looffset = (int)func; 1341 ip->gd_selector = selec; 1342 ip->gd_stkcpy = 0; 1343 ip->gd_xx = 0; 1344 ip->gd_type = typ; 1345 ip->gd_dpl = dpl; 1346 ip->gd_p = 1; 1347 ip->gd_hioffset = ((int)func)>>16 ; 1348} 1349 1350#define IDTVEC(name) __CONCAT(X,name) 1351 1352extern inthand_t 1353 IDTVEC(div), IDTVEC(dbg), IDTVEC(nmi), IDTVEC(bpt), IDTVEC(ofl), 1354 IDTVEC(bnd), IDTVEC(ill), IDTVEC(dna), IDTVEC(fpusegm), 1355 IDTVEC(tss), IDTVEC(missing), IDTVEC(stk), IDTVEC(prot), 1356 IDTVEC(page), IDTVEC(mchk), IDTVEC(rsvd), IDTVEC(fpu), IDTVEC(align), 1357 IDTVEC(syscall), IDTVEC(int0x80_syscall); 1358 1359void 1360sdtossd(sd, ssd) 1361 struct segment_descriptor *sd; 1362 struct soft_segment_descriptor *ssd; 1363{ 1364 ssd->ssd_base = (sd->sd_hibase << 24) | sd->sd_lobase; 1365 ssd->ssd_limit = (sd->sd_hilimit << 16) | sd->sd_lolimit; 1366 ssd->ssd_type = sd->sd_type; 1367 ssd->ssd_dpl = sd->sd_dpl; 1368 ssd->ssd_p = sd->sd_p; 1369 ssd->ssd_def32 = sd->sd_def32; 1370 ssd->ssd_gran = sd->sd_gran; 1371} 1372 1373#define PHYSMAP_SIZE (2 * 8) 1374 1375/* 1376 * Populate the (physmap) array with base/bound pairs describing the 1377 * available physical memory in the system, then test this memory and 1378 * build the phys_avail array describing the actually-available memory. 1379 * 1380 * If we cannot accurately determine the physical memory map, then use 1381 * value from the 0xE801 call, and failing that, the RTC. 1382 * 1383 * Total memory size may be set by the kernel environment variable 1384 * hw.physmem or the compile-time define MAXMEM. 1385 */ 1386static void 1387getmemsize(int first) 1388{ 1389 int i, physmap_idx, pa_indx; 1390 u_int basemem, extmem; 1391 struct vm86frame vmf; 1392 struct vm86context vmc; 1393 vm_offset_t pa, physmap[PHYSMAP_SIZE]; 1394 pt_entry_t pte; 1395 const char *cp; 1396 struct { 1397 u_int64_t base; 1398 u_int64_t length; 1399 u_int32_t type; 1400 } *smap; 1401 1402 bzero(&vmf, sizeof(struct vm86frame)); 1403 bzero(physmap, sizeof(physmap)); 1404 1405 /* 1406 * Perform "base memory" related probes & setup 1407 */ 1408 vm86_intcall(0x12, &vmf); 1409 basemem = vmf.vmf_ax; 1410 if (basemem > 640) { 1411 printf("Preposterous BIOS basemem of %uK, truncating to 640K\n", 1412 basemem); 1413 basemem = 640; 1414 } 1415 1416 /* 1417 * XXX if biosbasemem is now < 640, there is a `hole' 1418 * between the end of base memory and the start of 1419 * ISA memory. The hole may be empty or it may 1420 * contain BIOS code or data. Map it read/write so 1421 * that the BIOS can write to it. (Memory from 0 to 1422 * the physical end of the kernel is mapped read-only 1423 * to begin with and then parts of it are remapped. 1424 * The parts that aren't remapped form holes that 1425 * remain read-only and are unused by the kernel. 1426 * The base memory area is below the physical end of 1427 * the kernel and right now forms a read-only hole. 1428 * The part of it from PAGE_SIZE to 1429 * (trunc_page(biosbasemem * 1024) - 1) will be 1430 * remapped and used by the kernel later.) 1431 * 1432 * This code is similar to the code used in 1433 * pmap_mapdev, but since no memory needs to be 1434 * allocated we simply change the mapping. 1435 */ 1436 for (pa = trunc_page(basemem * 1024); 1437 pa < ISA_HOLE_START; pa += PAGE_SIZE) { 1438 pte = (pt_entry_t)vtopte(pa + KERNBASE); 1439 *pte = pa | PG_RW | PG_V; 1440 } 1441 1442 /* 1443 * if basemem != 640, map pages r/w into vm86 page table so 1444 * that the bios can scribble on it. 1445 */ 1446 pte = (pt_entry_t)vm86paddr; 1447 for (i = basemem / 4; i < 160; i++) 1448 pte[i] = (i << PAGE_SHIFT) | PG_V | PG_RW | PG_U; 1449 1450 /* 1451 * map page 1 R/W into the kernel page table so we can use it 1452 * as a buffer. The kernel will unmap this page later. 1453 */ 1454 pte = (pt_entry_t)vtopte(KERNBASE + (1 << PAGE_SHIFT)); 1455 *pte = (1 << PAGE_SHIFT) | PG_RW | PG_V; 1456 1457 /* 1458 * get memory map with INT 15:E820 1459 */ 1460#define SMAPSIZ sizeof(*smap) 1461#define SMAP_SIG 0x534D4150 /* 'SMAP' */ 1462 1463 vmc.npages = 0; 1464 smap = (void *)vm86_addpage(&vmc, 1, KERNBASE + (1 << PAGE_SHIFT)); 1465 vm86_getptr(&vmc, (vm_offset_t)smap, &vmf.vmf_es, &vmf.vmf_di); 1466 1467 physmap_idx = 0; 1468 vmf.vmf_ebx = 0; 1469 do { 1470 vmf.vmf_eax = 0xE820; 1471 vmf.vmf_edx = SMAP_SIG; 1472 vmf.vmf_ecx = SMAPSIZ; 1473 i = vm86_datacall(0x15, &vmf, &vmc); 1474 if (i || vmf.vmf_eax != SMAP_SIG) 1475 break; 1476 if (boothowto & RB_VERBOSE) 1477 printf("SMAP type=%02x base=%08x %08x len=%08x %08x\n", 1478 smap->type, 1479 *(u_int32_t *)((char *)&smap->base + 4), 1480 (u_int32_t)smap->base, 1481 *(u_int32_t *)((char *)&smap->length + 4), 1482 (u_int32_t)smap->length); 1483 1484 if (smap->type != 0x01) 1485 goto next_run; 1486 1487 if (smap->length == 0) 1488 goto next_run; 1489 1490 if (smap->base >= 0xffffffff) { 1491 printf("%uK of memory above 4GB ignored\n", 1492 (u_int)(smap->length / 1024)); 1493 goto next_run; 1494 } 1495 1496 for (i = 0; i <= physmap_idx; i += 2) { 1497 if (smap->base < physmap[i + 1]) { 1498 if (boothowto & RB_VERBOSE) 1499 printf( 1500 "Overlapping or non-montonic memory region, ignoring second region\n"); 1501 goto next_run; 1502 } 1503 } 1504 1505 if (smap->base == physmap[physmap_idx + 1]) { 1506 physmap[physmap_idx + 1] += smap->length; 1507 goto next_run; 1508 } 1509 1510 physmap_idx += 2; 1511 if (physmap_idx == PHYSMAP_SIZE) { 1512 printf( 1513 "Too many segments in the physical address map, giving up\n"); 1514 break; 1515 } 1516 physmap[physmap_idx] = smap->base; 1517 physmap[physmap_idx + 1] = smap->base + smap->length; 1518next_run: 1519 } while (vmf.vmf_ebx != 0); 1520 1521 if (physmap[1] != 0) 1522 goto physmap_done; 1523 1524 /* 1525 * If we failed above, try memory map with INT 15:E801 1526 */ 1527 vmf.vmf_ax = 0xE801; 1528 if (vm86_intcall(0x15, &vmf) == 0) { 1529 extmem = vmf.vmf_cx + vmf.vmf_dx * 64; 1530 } else { 1531#if 0 1532 vmf.vmf_ah = 0x88; 1533 vm86_intcall(0x15, &vmf); 1534 extmem = vmf.vmf_ax; 1535#else 1536 /* 1537 * Prefer the RTC value for extended memory. 1538 */ 1539 extmem = rtcin(RTC_EXTLO) + (rtcin(RTC_EXTHI) << 8); 1540#endif 1541 } 1542 1543 /* 1544 * Special hack for chipsets that still remap the 384k hole when 1545 * there's 16MB of memory - this really confuses people that 1546 * are trying to use bus mastering ISA controllers with the 1547 * "16MB limit"; they only have 16MB, but the remapping puts 1548 * them beyond the limit. 1549 * 1550 * If extended memory is between 15-16MB (16-17MB phys address range), 1551 * chop it to 15MB. 1552 */ 1553 if ((extmem > 15 * 1024) && (extmem < 16 * 1024)) 1554 extmem = 15 * 1024; 1555 1556 physmap[0] = 0; 1557 physmap[1] = basemem * 1024; 1558 physmap_idx = 2; 1559 physmap[physmap_idx] = 0x100000; 1560 physmap[physmap_idx + 1] = physmap[physmap_idx] + extmem * 1024; 1561 1562physmap_done: 1563 /* 1564 * Now, physmap contains a map of physical memory. 1565 */ 1566 1567#ifdef SMP 1568 /* make hole for AP bootstrap code */ 1569 physmap[1] = mp_bootaddress(physmap[1] / 1024); 1570 1571 /* look for the MP hardware - needed for apic addresses */ 1572 mp_probe(); 1573#endif 1574 1575 /* 1576 * Maxmem isn't the "maximum memory", it's one larger than the 1577 * highest page of the physical address space. It should be 1578 * called something like "Maxphyspage". We may adjust this 1579 * based on ``hw.physmem'' and the results of the memory test. 1580 */ 1581 Maxmem = atop(physmap[physmap_idx + 1]); 1582 1583#ifdef MAXMEM 1584 Maxmem = MAXMEM / 4; 1585#endif 1586 1587 /* 1588 * hw.maxmem is a size in bytes; we also allow k, m, and g suffixes 1589 * for the appropriate modifiers. This overrides MAXMEM. 1590 */ 1591 if ((cp = getenv("hw.physmem")) != NULL) { 1592 u_int64_t AllowMem, sanity; 1593 char *ep; 1594 1595 sanity = AllowMem = strtouq(cp, &ep, 0); 1596 if ((ep != cp) && (*ep != 0)) { 1597 switch(*ep) { 1598 case 'g': 1599 case 'G': 1600 AllowMem <<= 10; 1601 case 'm': 1602 case 'M': 1603 AllowMem <<= 10; 1604 case 'k': 1605 case 'K': 1606 AllowMem <<= 10; 1607 break; 1608 default: 1609 AllowMem = sanity = 0; 1610 } 1611 if (AllowMem < sanity) 1612 AllowMem = 0; 1613 } 1614 if (AllowMem == 0) 1615 printf("Ignoring invalid memory size of '%s'\n", cp); 1616 else 1617 Maxmem = atop(AllowMem); 1618 } 1619 1620 if (atop(physmap[physmap_idx + 1]) != Maxmem && 1621 (boothowto & RB_VERBOSE)) 1622 printf("Physical memory use set to %uK\n", Maxmem * 4); 1623 1624 /* 1625 * If Maxmem has been increased beyond what the system has detected, 1626 * extend the last memory segment to the new limit. 1627 */ 1628 if (atop(physmap[physmap_idx + 1]) < Maxmem) 1629 physmap[physmap_idx + 1] = ptoa(Maxmem); 1630 1631 /* call pmap initialization to make new kernel address space */ 1632 pmap_bootstrap(first, 0); 1633 1634 /* 1635 * Size up each available chunk of physical memory. 1636 */ 1637 physmap[0] = PAGE_SIZE; /* mask off page 0 */ 1638 pa_indx = 0; 1639 phys_avail[pa_indx++] = physmap[0]; 1640 phys_avail[pa_indx] = physmap[0]; 1641#if 0 1642 pte = (pt_entry_t)vtopte(KERNBASE); 1643#else 1644 pte = (pt_entry_t)CMAP1; 1645#endif 1646 1647 /* 1648 * physmap is in bytes, so when converting to page boundaries, 1649 * round up the start address and round down the end address. 1650 */ 1651 for (i = 0; i <= physmap_idx; i += 2) { 1652 vm_offset_t end; 1653 1654 end = ptoa(Maxmem); 1655 if (physmap[i + 1] < end) 1656 end = trunc_page(physmap[i + 1]); 1657 for (pa = round_page(physmap[i]); pa < end; pa += PAGE_SIZE) { 1658 int tmp, page_bad; 1659#if 0 1660 int *ptr = 0; 1661#else 1662 int *ptr = (int *)CADDR1; 1663#endif 1664 1665 /* 1666 * block out kernel memory as not available. 1667 */ 1668 if (pa >= 0x100000 && pa < first) 1669 continue; 1670 1671 page_bad = FALSE; 1672 1673 /* 1674 * map page into kernel: valid, read/write,non-cacheable 1675 */ 1676 *pte = pa | PG_V | PG_RW | PG_N; 1677 invltlb(); 1678 1679 tmp = *(int *)ptr; 1680 /* 1681 * Test for alternating 1's and 0's 1682 */ 1683 *(volatile int *)ptr = 0xaaaaaaaa; 1684 if (*(volatile int *)ptr != 0xaaaaaaaa) { 1685 page_bad = TRUE; 1686 } 1687 /* 1688 * Test for alternating 0's and 1's 1689 */ 1690 *(volatile int *)ptr = 0x55555555; 1691 if (*(volatile int *)ptr != 0x55555555) { 1692 page_bad = TRUE; 1693 } 1694 /* 1695 * Test for all 1's 1696 */ 1697 *(volatile int *)ptr = 0xffffffff; 1698 if (*(volatile int *)ptr != 0xffffffff) { 1699 page_bad = TRUE; 1700 } 1701 /* 1702 * Test for all 0's 1703 */ 1704 *(volatile int *)ptr = 0x0; 1705 if (*(volatile int *)ptr != 0x0) { 1706 page_bad = TRUE; 1707 } 1708 /* 1709 * Restore original value. 1710 */ 1711 *(int *)ptr = tmp; 1712 1713 /* 1714 * Adjust array of valid/good pages. 1715 */ 1716 if (page_bad == TRUE) { 1717 continue; 1718 } 1719 /* 1720 * If this good page is a continuation of the 1721 * previous set of good pages, then just increase 1722 * the end pointer. Otherwise start a new chunk. 1723 * Note that "end" points one higher than end, 1724 * making the range >= start and < end. 1725 * If we're also doing a speculative memory 1726 * test and we at or past the end, bump up Maxmem 1727 * so that we keep going. The first bad page 1728 * will terminate the loop. 1729 */ 1730 if (phys_avail[pa_indx] == pa) { 1731 phys_avail[pa_indx] += PAGE_SIZE; 1732 } else { 1733 pa_indx++; 1734 if (pa_indx == PHYS_AVAIL_ARRAY_END) { 1735 printf("Too many holes in the physical address space, giving up\n"); 1736 pa_indx--; 1737 break; 1738 } 1739 phys_avail[pa_indx++] = pa; /* start */ 1740 phys_avail[pa_indx] = pa + PAGE_SIZE; /* end */ 1741 } 1742 physmem++; 1743 } 1744 } 1745 *pte = 0; 1746 invltlb(); 1747 1748 /* 1749 * XXX 1750 * The last chunk must contain at least one page plus the message 1751 * buffer to avoid complicating other code (message buffer address 1752 * calculation, etc.). 1753 */ 1754 while (phys_avail[pa_indx - 1] + PAGE_SIZE + 1755 round_page(MSGBUF_SIZE) >= phys_avail[pa_indx]) { 1756 physmem -= atop(phys_avail[pa_indx] - phys_avail[pa_indx - 1]); 1757 phys_avail[pa_indx--] = 0; 1758 phys_avail[pa_indx--] = 0; 1759 } 1760 1761 Maxmem = atop(phys_avail[pa_indx]); 1762 1763 /* Trim off space for the message buffer. */ 1764 phys_avail[pa_indx] -= round_page(MSGBUF_SIZE); 1765 1766 avail_end = phys_avail[pa_indx]; 1767} 1768 1769void 1770init386(first) 1771 int first; 1772{ 1773 int x; 1774 struct gate_descriptor *gdp; 1775 int gsel_tss; 1776#ifndef SMP 1777 /* table descriptors - used to load tables by microp */ 1778 struct region_descriptor r_gdt, r_idt; 1779#endif 1780 int off; 1781 1782 /* 1783 * Prevent lowering of the ipl if we call tsleep() early. 1784 */ 1785 safepri = cpl; 1786 1787 proc0.p_addr = proc0paddr; 1788 1789 atdevbase = ISA_HOLE_START + KERNBASE; 1790 1791 if (bootinfo.bi_modulep) { 1792 preload_metadata = (caddr_t)bootinfo.bi_modulep + KERNBASE; 1793 preload_bootstrap_relocate(KERNBASE); 1794 } 1795 if (bootinfo.bi_envp) 1796 kern_envp = (caddr_t)bootinfo.bi_envp + KERNBASE; 1797 1798 /* 1799 * make gdt memory segments, the code segment goes up to end of the 1800 * page with etext in it, the data segment goes to the end of 1801 * the address space 1802 */ 1803 /* 1804 * XXX text protection is temporarily (?) disabled. The limit was 1805 * i386_btop(round_page(etext)) - 1. 1806 */ 1807 gdt_segs[GCODE_SEL].ssd_limit = i386_btop(0) - 1; 1808 gdt_segs[GDATA_SEL].ssd_limit = i386_btop(0) - 1; 1809#ifdef SMP 1810 gdt_segs[GPRIV_SEL].ssd_limit = 1811 i386_btop(sizeof(struct privatespace)) - 1; 1812 gdt_segs[GPRIV_SEL].ssd_base = (int) &SMP_prvspace[0]; 1813 gdt_segs[GPROC0_SEL].ssd_base = 1814 (int) &SMP_prvspace[0].globaldata.gd_common_tss; 1815 SMP_prvspace[0].globaldata.gd_prvspace = &SMP_prvspace[0]; 1816#else 1817 gdt_segs[GPRIV_SEL].ssd_limit = i386_btop(0) - 1; 1818 gdt_segs[GPROC0_SEL].ssd_base = (int) &common_tss; 1819#endif 1820 1821 for (x = 0; x < NGDT; x++) { 1822#ifdef BDE_DEBUGGER 1823 /* avoid overwriting db entries with APM ones */ 1824 if (x >= GAPMCODE32_SEL && x <= GAPMDATA_SEL) 1825 continue; 1826#endif 1827 ssdtosd(&gdt_segs[x], &gdt[x].sd); 1828 } 1829 1830 r_gdt.rd_limit = NGDT * sizeof(gdt[0]) - 1; 1831 r_gdt.rd_base = (int) gdt; 1832 lgdt(&r_gdt); 1833 1834 /* make ldt memory segments */ 1835 /* 1836 * The data segment limit must not cover the user area because we 1837 * don't want the user area to be writable in copyout() etc. (page 1838 * level protection is lost in kernel mode on 386's). Also, we 1839 * don't want the user area to be writable directly (page level 1840 * protection of the user area is not available on 486's with 1841 * CR0_WP set, because there is no user-read/kernel-write mode). 1842 * 1843 * XXX - VM_MAXUSER_ADDRESS is an end address, not a max. And it 1844 * should be spelled ...MAX_USER... 1845 */ 1846#define VM_END_USER_RW_ADDRESS VM_MAXUSER_ADDRESS 1847 /* 1848 * The code segment limit has to cover the user area until we move 1849 * the signal trampoline out of the user area. This is safe because 1850 * the code segment cannot be written to directly. 1851 */ 1852#define VM_END_USER_R_ADDRESS (VM_END_USER_RW_ADDRESS + UPAGES * PAGE_SIZE) 1853 ldt_segs[LUCODE_SEL].ssd_limit = i386_btop(VM_END_USER_R_ADDRESS) - 1; 1854 ldt_segs[LUDATA_SEL].ssd_limit = i386_btop(VM_END_USER_RW_ADDRESS) - 1; 1855 for (x = 0; x < sizeof ldt_segs / sizeof ldt_segs[0]; x++) 1856 ssdtosd(&ldt_segs[x], &ldt[x].sd); 1857 1858 _default_ldt = GSEL(GLDT_SEL, SEL_KPL); 1859 lldt(_default_ldt); 1860#ifdef USER_LDT 1861 currentldt = _default_ldt; 1862#endif 1863 1864 /* exceptions */ 1865 for (x = 0; x < NIDT; x++) 1866 setidt(x, &IDTVEC(rsvd), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1867 setidt(0, &IDTVEC(div), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1868 setidt(1, &IDTVEC(dbg), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1869 setidt(2, &IDTVEC(nmi), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1870 setidt(3, &IDTVEC(bpt), SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL)); 1871 setidt(4, &IDTVEC(ofl), SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL)); 1872 setidt(5, &IDTVEC(bnd), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1873 setidt(6, &IDTVEC(ill), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1874 setidt(7, &IDTVEC(dna), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1875 setidt(8, 0, SDT_SYSTASKGT, SEL_KPL, GSEL(GPANIC_SEL, SEL_KPL)); 1876 setidt(9, &IDTVEC(fpusegm), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1877 setidt(10, &IDTVEC(tss), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1878 setidt(11, &IDTVEC(missing), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1879 setidt(12, &IDTVEC(stk), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1880 setidt(13, &IDTVEC(prot), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1881 setidt(14, &IDTVEC(page), SDT_SYS386IGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1882 setidt(15, &IDTVEC(rsvd), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1883 setidt(16, &IDTVEC(fpu), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1884 setidt(17, &IDTVEC(align), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1885 setidt(18, &IDTVEC(mchk), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1886 setidt(0x80, &IDTVEC(int0x80_syscall), 1887 SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL)); 1888 1889 r_idt.rd_limit = sizeof(idt0) - 1; 1890 r_idt.rd_base = (int) idt; 1891 lidt(&r_idt); 1892 1893 /* 1894 * Initialize the console before we print anything out. 1895 */ 1896 cninit(); 1897 1898#include "isa.h" 1899#if NISA >0 1900 isa_defaultirq(); 1901#endif 1902 rand_initialize(); 1903 1904#ifdef DDB 1905 kdb_init(); 1906 if (boothowto & RB_KDB) 1907 Debugger("Boot flags requested debugger"); 1908#endif 1909 1910 finishidentcpu(); /* Final stage of CPU initialization */ 1911 setidt(6, &IDTVEC(ill), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1912 setidt(13, &IDTVEC(prot), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1913 initializecpu(); /* Initialize CPU registers */ 1914 1915 /* make an initial tss so cpu can get interrupt stack on syscall! */ 1916 common_tss.tss_esp0 = (int) proc0.p_addr + UPAGES*PAGE_SIZE - 16; 1917 common_tss.tss_ss0 = GSEL(GDATA_SEL, SEL_KPL) ; 1918 gsel_tss = GSEL(GPROC0_SEL, SEL_KPL); 1919 private_tss = 0; 1920 tss_gdt = &gdt[GPROC0_SEL].sd; 1921 common_tssd = *tss_gdt; 1922 common_tss.tss_ioopt = (sizeof common_tss) << 16; 1923 ltr(gsel_tss); 1924 1925 dblfault_tss.tss_esp = dblfault_tss.tss_esp0 = dblfault_tss.tss_esp1 = 1926 dblfault_tss.tss_esp2 = (int) &dblfault_stack[sizeof(dblfault_stack)]; 1927 dblfault_tss.tss_ss = dblfault_tss.tss_ss0 = dblfault_tss.tss_ss1 = 1928 dblfault_tss.tss_ss2 = GSEL(GDATA_SEL, SEL_KPL); 1929 dblfault_tss.tss_cr3 = (int)IdlePTD; 1930 dblfault_tss.tss_eip = (int) dblfault_handler; 1931 dblfault_tss.tss_eflags = PSL_KERNEL; 1932 dblfault_tss.tss_ds = dblfault_tss.tss_es = 1933 dblfault_tss.tss_gs = GSEL(GDATA_SEL, SEL_KPL); 1934 dblfault_tss.tss_fs = GSEL(GPRIV_SEL, SEL_KPL); 1935 dblfault_tss.tss_cs = GSEL(GCODE_SEL, SEL_KPL); 1936 dblfault_tss.tss_ldt = GSEL(GLDT_SEL, SEL_KPL); 1937 1938 vm86_initialize(); 1939 getmemsize(first); 1940 1941 /* now running on new page tables, configured,and u/iom is accessible */ 1942 1943 /* Map the message buffer. */ 1944 for (off = 0; off < round_page(MSGBUF_SIZE); off += PAGE_SIZE) 1945 pmap_kenter((vm_offset_t)msgbufp + off, avail_end + off); 1946 1947 msgbufinit(msgbufp, MSGBUF_SIZE); 1948 1949 /* make a call gate to reenter kernel with */ 1950 gdp = &ldt[LSYS5CALLS_SEL].gd; 1951 1952 x = (int) &IDTVEC(syscall); 1953 gdp->gd_looffset = x++; 1954 gdp->gd_selector = GSEL(GCODE_SEL,SEL_KPL); 1955 gdp->gd_stkcpy = 1; 1956 gdp->gd_type = SDT_SYS386CGT; 1957 gdp->gd_dpl = SEL_UPL; 1958 gdp->gd_p = 1; 1959 gdp->gd_hioffset = ((int) &IDTVEC(syscall)) >>16; 1960 1961 /* XXX does this work? */ 1962 ldt[LBSDICALLS_SEL] = ldt[LSYS5CALLS_SEL]; 1963 ldt[LSOL26CALLS_SEL] = ldt[LSYS5CALLS_SEL]; 1964 1965 /* transfer to user mode */ 1966 1967 _ucodesel = LSEL(LUCODE_SEL, SEL_UPL); 1968 _udatasel = LSEL(LUDATA_SEL, SEL_UPL); 1969 1970 /* setup proc 0's pcb */ 1971 proc0.p_addr->u_pcb.pcb_flags = 0; 1972 proc0.p_addr->u_pcb.pcb_cr3 = (int)IdlePTD; 1973#ifdef SMP 1974 proc0.p_addr->u_pcb.pcb_mpnest = 1; 1975#endif 1976 proc0.p_addr->u_pcb.pcb_ext = 0; 1977} 1978 1979#if defined(I586_CPU) && !defined(NO_F00F_HACK) 1980static void f00f_hack(void *unused); 1981SYSINIT(f00f_hack, SI_SUB_INTRINSIC, SI_ORDER_FIRST, f00f_hack, NULL); 1982 1983static void 1984f00f_hack(void *unused) { 1985 struct gate_descriptor *new_idt; 1986#ifndef SMP 1987 struct region_descriptor r_idt; 1988#endif 1989 vm_offset_t tmp; 1990 1991 if (!has_f00f_bug) 1992 return; 1993 1994 printf("Intel Pentium detected, installing workaround for F00F bug\n"); 1995 1996 r_idt.rd_limit = sizeof(idt0) - 1; 1997 1998 tmp = kmem_alloc(kernel_map, PAGE_SIZE * 2); 1999 if (tmp == 0) 2000 panic("kmem_alloc returned 0"); 2001 if (((unsigned int)tmp & (PAGE_SIZE-1)) != 0) 2002 panic("kmem_alloc returned non-page-aligned memory"); 2003 /* Put the first seven entries in the lower page */ 2004 new_idt = (struct gate_descriptor*)(tmp + PAGE_SIZE - (7*8)); 2005 bcopy(idt, new_idt, sizeof(idt0)); 2006 r_idt.rd_base = (int)new_idt; 2007 lidt(&r_idt); 2008 idt = new_idt; 2009 if (vm_map_protect(kernel_map, tmp, tmp + PAGE_SIZE, 2010 VM_PROT_READ, FALSE) != KERN_SUCCESS) 2011 panic("vm_map_protect failed"); 2012 return; 2013} 2014#endif /* defined(I586_CPU) && !NO_F00F_HACK */ 2015 2016int 2017ptrace_set_pc(p, addr) 2018 struct proc *p; 2019 unsigned long addr; 2020{ 2021 p->p_md.md_regs->tf_eip = addr; 2022 return (0); 2023} 2024 2025int 2026ptrace_single_step(p) 2027 struct proc *p; 2028{ 2029 p->p_md.md_regs->tf_eflags |= PSL_T; 2030 return (0); 2031} 2032 2033int ptrace_read_u_check(p, addr, len) 2034 struct proc *p; 2035 vm_offset_t addr; 2036 size_t len; 2037{ 2038 vm_offset_t gap; 2039 2040 if ((vm_offset_t) (addr + len) < addr) 2041 return EPERM; 2042 if ((vm_offset_t) (addr + len) <= sizeof(struct user)) 2043 return 0; 2044 2045 gap = (char *) p->p_md.md_regs - (char *) p->p_addr; 2046 2047 if ((vm_offset_t) addr < gap) 2048 return EPERM; 2049 if ((vm_offset_t) (addr + len) <= 2050 (vm_offset_t) (gap + sizeof(struct trapframe))) 2051 return 0; 2052 return EPERM; 2053} 2054 2055int ptrace_write_u(p, off, data) 2056 struct proc *p; 2057 vm_offset_t off; 2058 long data; 2059{ 2060 struct trapframe frame_copy; 2061 vm_offset_t min; 2062 struct trapframe *tp; 2063 2064 /* 2065 * Privileged kernel state is scattered all over the user area. 2066 * Only allow write access to parts of regs and to fpregs. 2067 */ 2068 min = (char *)p->p_md.md_regs - (char *)p->p_addr; 2069 if (off >= min && off <= min + sizeof(struct trapframe) - sizeof(int)) { 2070 tp = p->p_md.md_regs; 2071 frame_copy = *tp; 2072 *(int *)((char *)&frame_copy + (off - min)) = data; 2073 if (!EFL_SECURE(frame_copy.tf_eflags, tp->tf_eflags) || 2074 !CS_SECURE(frame_copy.tf_cs)) 2075 return (EINVAL); 2076 *(int*)((char *)p->p_addr + off) = data; 2077 return (0); 2078 } 2079 min = offsetof(struct user, u_pcb) + offsetof(struct pcb, pcb_savefpu); 2080 if (off >= min && off <= min + sizeof(struct save87) - sizeof(int)) { 2081 *(int*)((char *)p->p_addr + off) = data; 2082 return (0); 2083 } 2084 return (EFAULT); 2085} 2086 2087int 2088fill_regs(p, regs) 2089 struct proc *p; 2090 struct reg *regs; 2091{ 2092 struct pcb *pcb; 2093 struct trapframe *tp; 2094 2095 tp = p->p_md.md_regs; 2096 regs->r_fs = tp->tf_fs; 2097 regs->r_es = tp->tf_es; 2098 regs->r_ds = tp->tf_ds; 2099 regs->r_edi = tp->tf_edi; 2100 regs->r_esi = tp->tf_esi; 2101 regs->r_ebp = tp->tf_ebp; 2102 regs->r_ebx = tp->tf_ebx; 2103 regs->r_edx = tp->tf_edx; 2104 regs->r_ecx = tp->tf_ecx; 2105 regs->r_eax = tp->tf_eax; 2106 regs->r_eip = tp->tf_eip; 2107 regs->r_cs = tp->tf_cs; 2108 regs->r_eflags = tp->tf_eflags; 2109 regs->r_esp = tp->tf_esp; 2110 regs->r_ss = tp->tf_ss; 2111 pcb = &p->p_addr->u_pcb; 2112 regs->r_gs = pcb->pcb_gs; 2113 return (0); 2114} 2115 2116int 2117set_regs(p, regs) 2118 struct proc *p; 2119 struct reg *regs; 2120{ 2121 struct pcb *pcb; 2122 struct trapframe *tp; 2123 2124 tp = p->p_md.md_regs; 2125 if (!EFL_SECURE(regs->r_eflags, tp->tf_eflags) || 2126 !CS_SECURE(regs->r_cs)) 2127 return (EINVAL); 2128 tp->tf_fs = regs->r_fs; 2129 tp->tf_es = regs->r_es; 2130 tp->tf_ds = regs->r_ds; 2131 tp->tf_edi = regs->r_edi; 2132 tp->tf_esi = regs->r_esi; 2133 tp->tf_ebp = regs->r_ebp; 2134 tp->tf_ebx = regs->r_ebx; 2135 tp->tf_edx = regs->r_edx; 2136 tp->tf_ecx = regs->r_ecx; 2137 tp->tf_eax = regs->r_eax; 2138 tp->tf_eip = regs->r_eip; 2139 tp->tf_cs = regs->r_cs; 2140 tp->tf_eflags = regs->r_eflags; 2141 tp->tf_esp = regs->r_esp; 2142 tp->tf_ss = regs->r_ss; 2143 pcb = &p->p_addr->u_pcb; 2144 pcb->pcb_gs = regs->r_gs; 2145 return (0); 2146} 2147 2148int 2149fill_fpregs(p, fpregs) 2150 struct proc *p; 2151 struct fpreg *fpregs; 2152{ 2153 bcopy(&p->p_addr->u_pcb.pcb_savefpu, fpregs, sizeof *fpregs); 2154 return (0); 2155} 2156 2157int 2158set_fpregs(p, fpregs) 2159 struct proc *p; 2160 struct fpreg *fpregs; 2161{ 2162 bcopy(fpregs, &p->p_addr->u_pcb.pcb_savefpu, sizeof *fpregs); 2163 return (0); 2164} 2165 2166int 2167fill_dbregs(p, dbregs) 2168 struct proc *p; 2169 struct dbreg *dbregs; 2170{ 2171 struct pcb *pcb; 2172 2173 pcb = &p->p_addr->u_pcb; 2174 dbregs->dr0 = pcb->pcb_dr0; 2175 dbregs->dr1 = pcb->pcb_dr1; 2176 dbregs->dr2 = pcb->pcb_dr2; 2177 dbregs->dr3 = pcb->pcb_dr3; 2178 dbregs->dr4 = 0; 2179 dbregs->dr5 = 0; 2180 dbregs->dr6 = pcb->pcb_dr6; 2181 dbregs->dr7 = pcb->pcb_dr7; 2182 return (0); 2183} 2184 2185int 2186set_dbregs(p, dbregs) 2187 struct proc *p; 2188 struct dbreg *dbregs; 2189{ 2190 struct pcb *pcb; 2191 2192 pcb = &p->p_addr->u_pcb; 2193 2194 /* 2195 * Don't let a process set a breakpoint that is not within the 2196 * process's address space. If a process could do this, it 2197 * could halt the system by setting a breakpoint in the kernel 2198 * (if ddb was enabled). Thus, we need to check to make sure 2199 * that no breakpoints are being enabled for addresses outside 2200 * process's address space, unless, perhaps, we were called by 2201 * uid 0. 2202 * 2203 * XXX - what about when the watched area of the user's 2204 * address space is written into from within the kernel 2205 * ... wouldn't that still cause a breakpoint to be generated 2206 * from within kernel mode? 2207 */ 2208 2209 if (p->p_ucred->cr_uid != 0) { 2210 if (dbregs->dr7 & 0x3) { 2211 /* dr0 is enabled */ 2212 if (dbregs->dr0 >= VM_MAXUSER_ADDRESS) 2213 return (EINVAL); 2214 } 2215 2216 if (dbregs->dr7 & (0x3<<2)) { 2217 /* dr1 is enabled */ 2218 if (dbregs->dr1 >= VM_MAXUSER_ADDRESS) 2219 return (EINVAL); 2220 } 2221 2222 if (dbregs->dr7 & (0x3<<4)) { 2223 /* dr2 is enabled */ 2224 if (dbregs->dr2 >= VM_MAXUSER_ADDRESS) 2225 return (EINVAL); 2226 } 2227 2228 if (dbregs->dr7 & (0x3<<6)) { 2229 /* dr3 is enabled */ 2230 if (dbregs->dr3 >= VM_MAXUSER_ADDRESS) 2231 return (EINVAL); 2232 } 2233 } 2234 2235 pcb->pcb_dr0 = dbregs->dr0; 2236 pcb->pcb_dr1 = dbregs->dr1; 2237 pcb->pcb_dr2 = dbregs->dr2; 2238 pcb->pcb_dr3 = dbregs->dr3; 2239 pcb->pcb_dr6 = dbregs->dr6; 2240 pcb->pcb_dr7 = dbregs->dr7; 2241 2242 pcb->pcb_flags |= PCB_DBREGS; 2243 2244 return (0); 2245} 2246 2247#ifndef DDB 2248void 2249Debugger(const char *msg) 2250{ 2251 printf("Debugger(\"%s\") called.\n", msg); 2252} 2253#endif /* no DDB */ 2254 2255#include <sys/disklabel.h> 2256 2257/* 2258 * Determine the size of the transfer, and make sure it is 2259 * within the boundaries of the partition. Adjust transfer 2260 * if needed, and signal errors or early completion. 2261 */ 2262int 2263bounds_check_with_label(struct buf *bp, struct disklabel *lp, int wlabel) 2264{ 2265 struct partition *p = lp->d_partitions + dkpart(bp->b_dev); 2266 int labelsect = lp->d_partitions[0].p_offset; 2267 int maxsz = p->p_size, 2268 sz = (bp->b_bcount + DEV_BSIZE - 1) >> DEV_BSHIFT; 2269 2270 /* overwriting disk label ? */ 2271 /* XXX should also protect bootstrap in first 8K */ 2272 if (bp->b_blkno + p->p_offset <= LABELSECTOR + labelsect && 2273#if LABELSECTOR != 0 2274 bp->b_blkno + p->p_offset + sz > LABELSECTOR + labelsect && 2275#endif 2276 (bp->b_flags & B_READ) == 0 && wlabel == 0) { 2277 bp->b_error = EROFS; 2278 goto bad; 2279 } 2280 2281#if defined(DOSBBSECTOR) && defined(notyet) 2282 /* overwriting master boot record? */ 2283 if (bp->b_blkno + p->p_offset <= DOSBBSECTOR && 2284 (bp->b_flags & B_READ) == 0 && wlabel == 0) { 2285 bp->b_error = EROFS; 2286 goto bad; 2287 } 2288#endif 2289 2290 /* beyond partition? */ 2291 if (bp->b_blkno < 0 || bp->b_blkno + sz > maxsz) { 2292 /* if exactly at end of disk, return an EOF */ 2293 if (bp->b_blkno == maxsz) { 2294 bp->b_resid = bp->b_bcount; 2295 return(0); 2296 } 2297 /* or truncate if part of it fits */ 2298 sz = maxsz - bp->b_blkno; 2299 if (sz <= 0) { 2300 bp->b_error = EINVAL; 2301 goto bad; 2302 } 2303 bp->b_bcount = sz << DEV_BSHIFT; 2304 } 2305 2306 bp->b_pblkno = bp->b_blkno + p->p_offset; 2307 return(1); 2308 2309bad: 2310 bp->b_flags |= B_ERROR; 2311 return(-1); 2312} 2313 2314#ifdef DDB 2315 2316/* 2317 * Provide inb() and outb() as functions. They are normally only 2318 * available as macros calling inlined functions, thus cannot be 2319 * called inside DDB. 2320 * 2321 * The actual code is stolen from <machine/cpufunc.h>, and de-inlined. 2322 */ 2323 2324#undef inb 2325#undef outb 2326 2327/* silence compiler warnings */ 2328u_char inb(u_int); 2329void outb(u_int, u_char); 2330 2331u_char 2332inb(u_int port) 2333{ 2334 u_char data; 2335 /* 2336 * We use %%dx and not %1 here because i/o is done at %dx and not at 2337 * %edx, while gcc generates inferior code (movw instead of movl) 2338 * if we tell it to load (u_short) port. 2339 */ 2340 __asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port)); 2341 return (data); 2342} 2343 2344void 2345outb(u_int port, u_char data) 2346{ 2347 u_char al; 2348 /* 2349 * Use an unnecessary assignment to help gcc's register allocator. 2350 * This make a large difference for gcc-1.40 and a tiny difference 2351 * for gcc-2.6.0. For gcc-1.40, al had to be ``asm("ax")'' for 2352 * best results. gcc-2.6.0 can't handle this. 2353 */ 2354 al = data; 2355 __asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port)); 2356} 2357 2358#endif /* DDB */ 2359