machdep.c revision 67308
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 67308 2000-10-19 07:47:16Z jhb $ 39 */ 40#include "apm.h" 41#include "npx.h" 42#include "opt_atalk.h" 43#include "opt_compat.h" 44#include "opt_cpu.h" 45#include "opt_ddb.h" 46#include "opt_inet.h" 47#include "opt_ipx.h" 48#include "opt_maxmem.h" 49#include "opt_msgbuf.h" 50#include "opt_perfmon.h" 51#include "opt_user_ldt.h" 52#include "opt_userconfig.h" 53 54#include <sys/param.h> 55#include <sys/systm.h> 56#include <sys/sysproto.h> 57#include <sys/signalvar.h> 58#include <sys/ipl.h> 59#include <sys/kernel.h> 60#include <sys/ktr.h> 61#include <sys/linker.h> 62#include <sys/malloc.h> 63#include <sys/proc.h> 64#include <sys/bio.h> 65#include <sys/buf.h> 66#include <sys/reboot.h> 67#include <sys/callout.h> 68#include <sys/mbuf.h> 69#include <sys/msgbuf.h> 70#include <sys/sysent.h> 71#include <sys/sysctl.h> 72#include <sys/vmmeter.h> 73#include <sys/bus.h> 74#include <sys/eventhandler.h> 75 76#include <vm/vm.h> 77#include <vm/vm_param.h> 78#include <sys/lock.h> 79#include <vm/vm_kern.h> 80#include <vm/vm_object.h> 81#include <vm/vm_page.h> 82#include <vm/vm_map.h> 83#include <vm/vm_pager.h> 84#include <vm/vm_extern.h> 85 86#include <sys/user.h> 87#include <sys/exec.h> 88#include <sys/cons.h> 89 90#include <ddb/ddb.h> 91 92#include <net/netisr.h> 93 94#include <machine/cpu.h> 95#include <machine/cputypes.h> 96#include <machine/reg.h> 97#include <machine/clock.h> 98#include <machine/specialreg.h> 99#include <machine/bootinfo.h> 100#include <machine/md_var.h> 101#include <machine/mutex.h> 102#include <machine/pc/bios.h> 103#include <machine/pcb_ext.h> /* pcb.h included via sys/user.h */ 104#include <machine/globaldata.h> 105#include <machine/globals.h> 106#ifdef SMP 107#include <machine/smp.h> 108#endif 109#ifdef PERFMON 110#include <machine/perfmon.h> 111#endif 112 113#ifdef OLD_BUS_ARCH 114#include <i386/isa/isa_device.h> 115#endif 116#include <i386/isa/icu.h> 117#include <i386/isa/intr_machdep.h> 118#include <isa/rtc.h> 119#include <machine/vm86.h> 120#include <sys/ptrace.h> 121#include <machine/sigframe.h> 122 123extern void init386 __P((int first)); 124extern void dblfault_handler __P((void)); 125 126extern void printcpuinfo(void); /* XXX header file */ 127extern void earlysetcpuclass(void); /* same header file */ 128extern void finishidentcpu(void); 129extern void panicifcpuunsupported(void); 130extern void initializecpu(void); 131 132#define CS_SECURE(cs) (ISPL(cs) == SEL_UPL) 133#define EFL_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) 134 135static void cpu_startup __P((void *)); 136SYSINIT(cpu, SI_SUB_CPU, SI_ORDER_FIRST, cpu_startup, NULL) 137 138int _udatasel, _ucodesel; 139u_int atdevbase; 140 141#if defined(SWTCH_OPTIM_STATS) 142extern int swtch_optim_stats; 143SYSCTL_INT(_debug, OID_AUTO, swtch_optim_stats, 144 CTLFLAG_RD, &swtch_optim_stats, 0, ""); 145SYSCTL_INT(_debug, OID_AUTO, tlb_flush_count, 146 CTLFLAG_RD, &tlb_flush_count, 0, ""); 147#endif 148 149#ifdef PC98 150static int ispc98 = 1; 151#else 152static int ispc98 = 0; 153#endif 154SYSCTL_INT(_machdep, OID_AUTO, ispc98, CTLFLAG_RD, &ispc98, 0, ""); 155 156int physmem = 0; 157int cold = 1; 158 159static void osendsig __P((sig_t catcher, int sig, sigset_t *mask, u_long code)); 160 161static int 162sysctl_hw_physmem(SYSCTL_HANDLER_ARGS) 163{ 164 int error = sysctl_handle_int(oidp, 0, ctob(physmem), req); 165 return (error); 166} 167 168SYSCTL_PROC(_hw, HW_PHYSMEM, physmem, CTLTYPE_INT|CTLFLAG_RD, 169 0, 0, sysctl_hw_physmem, "I", ""); 170 171static int 172sysctl_hw_usermem(SYSCTL_HANDLER_ARGS) 173{ 174 int error = sysctl_handle_int(oidp, 0, 175 ctob(physmem - cnt.v_wire_count), req); 176 return (error); 177} 178 179SYSCTL_PROC(_hw, HW_USERMEM, usermem, CTLTYPE_INT|CTLFLAG_RD, 180 0, 0, sysctl_hw_usermem, "I", ""); 181 182static int 183sysctl_hw_availpages(SYSCTL_HANDLER_ARGS) 184{ 185 int error = sysctl_handle_int(oidp, 0, 186 i386_btop(avail_end - avail_start), req); 187 return (error); 188} 189 190SYSCTL_PROC(_hw, OID_AUTO, availpages, CTLTYPE_INT|CTLFLAG_RD, 191 0, 0, sysctl_hw_availpages, "I", ""); 192 193static int 194sysctl_machdep_msgbuf(SYSCTL_HANDLER_ARGS) 195{ 196 int error; 197 198 /* Unwind the buffer, so that it's linear (possibly starting with 199 * some initial nulls). 200 */ 201 error=sysctl_handle_opaque(oidp,msgbufp->msg_ptr+msgbufp->msg_bufr, 202 msgbufp->msg_size-msgbufp->msg_bufr,req); 203 if(error) return(error); 204 if(msgbufp->msg_bufr>0) { 205 error=sysctl_handle_opaque(oidp,msgbufp->msg_ptr, 206 msgbufp->msg_bufr,req); 207 } 208 return(error); 209} 210 211SYSCTL_PROC(_machdep, OID_AUTO, msgbuf, CTLTYPE_STRING|CTLFLAG_RD, 212 0, 0, sysctl_machdep_msgbuf, "A","Contents of kernel message buffer"); 213 214static int msgbuf_clear; 215 216static int 217sysctl_machdep_msgbuf_clear(SYSCTL_HANDLER_ARGS) 218{ 219 int error; 220 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, 221 req); 222 if (!error && req->newptr) { 223 /* Clear the buffer and reset write pointer */ 224 bzero(msgbufp->msg_ptr,msgbufp->msg_size); 225 msgbufp->msg_bufr=msgbufp->msg_bufx=0; 226 msgbuf_clear=0; 227 } 228 return (error); 229} 230 231SYSCTL_PROC(_machdep, OID_AUTO, msgbuf_clear, CTLTYPE_INT|CTLFLAG_RW, 232 &msgbuf_clear, 0, sysctl_machdep_msgbuf_clear, "I", 233 "Clear kernel message buffer"); 234 235int bootverbose = 0, Maxmem = 0; 236long dumplo; 237 238vm_offset_t phys_avail[10]; 239 240/* must be 2 less so 0 0 can signal end of chunks */ 241#define PHYS_AVAIL_ARRAY_END ((sizeof(phys_avail) / sizeof(vm_offset_t)) - 2) 242 243static vm_offset_t buffer_sva, buffer_eva; 244vm_offset_t clean_sva, clean_eva; 245static vm_offset_t pager_sva, pager_eva; 246static struct trapframe proc0_tf; 247 248struct cpuhead cpuhead; 249 250struct mtx sched_lock; 251struct mtx Giant; 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("%s", 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 unsigned 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); 332 333 /* 334 * The nominal buffer size (and minimum KVA allocation) is BKVASIZE. 335 * For the first 64MB of ram nominally allocate sufficient buffers to 336 * cover 1/4 of our ram. Beyond the first 64MB allocate additional 337 * buffers to cover 1/20 of our ram over 64MB. 338 * 339 * factor represents the 1/4 x ram conversion. 340 */ 341 if (nbuf == 0) { 342 int factor = 4 * BKVASIZE / PAGE_SIZE; 343 344 nbuf = 50; 345 if (physmem > 1024) 346 nbuf += min((physmem - 1024) / factor, 16384 / factor); 347 if (physmem > 16384) 348 nbuf += (physmem - 16384) * 2 / (factor * 5); 349 } 350 351 /* 352 * Do not allow the buffer_map to be more then 1/2 the size of the 353 * kernel_map. 354 */ 355 if (nbuf > (kernel_map->max_offset - kernel_map->min_offset) / 356 (BKVASIZE * 2)) { 357 nbuf = (kernel_map->max_offset - kernel_map->min_offset) / 358 (BKVASIZE * 2); 359 printf("Warning: nbufs capped at %d\n", nbuf); 360 } 361 362 nswbuf = max(min(nbuf/4, 256), 16); 363 364 valloc(swbuf, struct buf, nswbuf); 365 valloc(buf, struct buf, nbuf); 366 v = bufhashinit(v); 367 368 /* 369 * End of first pass, size has been calculated so allocate memory 370 */ 371 if (firstaddr == 0) { 372 size = (vm_size_t)(v - firstaddr); 373 firstaddr = (int)kmem_alloc(kernel_map, round_page(size)); 374 if (firstaddr == 0) 375 panic("startup: no room for tables"); 376 goto again; 377 } 378 379 /* 380 * End of second pass, addresses have been assigned 381 */ 382 if ((vm_size_t)(v - firstaddr) != size) 383 panic("startup: table size inconsistency"); 384 385 clean_map = kmem_suballoc(kernel_map, &clean_sva, &clean_eva, 386 (nbuf*BKVASIZE) + (nswbuf*MAXPHYS) + pager_map_size); 387 buffer_map = kmem_suballoc(clean_map, &buffer_sva, &buffer_eva, 388 (nbuf*BKVASIZE)); 389 pager_map = kmem_suballoc(clean_map, &pager_sva, &pager_eva, 390 (nswbuf*MAXPHYS) + pager_map_size); 391 pager_map->system_map = 1; 392 exec_map = kmem_suballoc(kernel_map, &minaddr, &maxaddr, 393 (16*(ARG_MAX+(PAGE_SIZE*3)))); 394 395 /* 396 * XXX: Mbuf system machine-specific initializations should 397 * go here, if anywhere. 398 */ 399 400 /* 401 * Initialize callouts 402 */ 403 SLIST_INIT(&callfree); 404 for (i = 0; i < ncallout; i++) { 405 callout_init(&callout[i]); 406 callout[i].c_flags = CALLOUT_LOCAL_ALLOC; 407 SLIST_INSERT_HEAD(&callfree, &callout[i], c_links.sle); 408 } 409 410 for (i = 0; i < callwheelsize; i++) { 411 TAILQ_INIT(&callwheel[i]); 412 } 413 414#if defined(USERCONFIG) 415 userconfig(); 416 cninit(); /* the preferred console may have changed */ 417#endif 418 419 printf("avail memory = %u (%uK bytes)\n", ptoa(cnt.v_free_count), 420 ptoa(cnt.v_free_count) / 1024); 421 422 /* 423 * Set up buffers, so they can be used to read disk labels. 424 */ 425 bufinit(); 426 vm_pager_bufferinit(); 427 428 SLIST_INIT(&cpuhead); 429 SLIST_INSERT_HEAD(&cpuhead, GLOBALDATA, gd_allcpu); 430 431 mtx_init(&sched_lock, "sched lock", MTX_SPIN); 432 433#ifdef SMP 434 /* 435 * OK, enough kmem_alloc/malloc state should be up, lets get on with it! 436 */ 437 mp_start(); /* fire up the APs and APICs */ 438 mp_announce(); 439#endif /* SMP */ 440 cpu_setregs(); 441} 442 443int 444register_netisr(num, handler) 445 int num; 446 netisr_t *handler; 447{ 448 449 if (num < 0 || num >= (sizeof(netisrs)/sizeof(*netisrs)) ) { 450 printf("register_netisr: bad isr number: %d\n", num); 451 return (EINVAL); 452 } 453 netisrs[num] = handler; 454 return (0); 455} 456 457int 458unregister_netisr(num) 459 int num; 460{ 461 462 if (num < 0 || num >= (sizeof(netisrs)/sizeof(*netisrs)) ) { 463 printf("unregister_netisr: bad isr number: %d\n", num); 464 return (EINVAL); 465 } 466 netisrs[num] = NULL; 467 return (0); 468} 469 470/* 471 * Send an interrupt to process. 472 * 473 * Stack is set up to allow sigcode stored 474 * at top to call routine, followed by kcall 475 * to sigreturn routine below. After sigreturn 476 * resets the signal mask, the stack, and the 477 * frame pointer, it returns to the user 478 * specified pc, psl. 479 */ 480static void 481osendsig(catcher, sig, mask, code) 482 sig_t catcher; 483 int sig; 484 sigset_t *mask; 485 u_long code; 486{ 487 struct osigframe sf; 488 struct osigframe *fp; 489 struct proc *p; 490 struct sigacts *psp; 491 struct trapframe *regs; 492 int oonstack; 493 494 p = curproc; 495 psp = p->p_sigacts; 496 regs = p->p_md.md_regs; 497 oonstack = p->p_sigstk.ss_flags & SS_ONSTACK; 498 499 /* Allocate and validate space for the signal handler context. */ 500 if ((p->p_flag & P_ALTSTACK) && !oonstack && 501 SIGISMEMBER(psp->ps_sigonstack, sig)) { 502 fp = (struct osigframe *)(p->p_sigstk.ss_sp + 503 p->p_sigstk.ss_size - sizeof(struct osigframe)); 504 p->p_sigstk.ss_flags |= SS_ONSTACK; 505 } else 506 fp = (struct osigframe *)regs->tf_esp - 1; 507 508 /* 509 * grow_stack() will return 0 if *fp does not fit inside the stack 510 * and the stack can not be grown. 511 * useracc() will return FALSE if access is denied. 512 */ 513 if (grow_stack(p, (int)fp) == 0 || 514 !useracc((caddr_t)fp, sizeof(*fp), VM_PROT_WRITE)) { 515 /* 516 * Process has trashed its stack; give it an illegal 517 * instruction to halt it in its tracks. 518 */ 519 SIGACTION(p, SIGILL) = SIG_DFL; 520 SIGDELSET(p->p_sigignore, SIGILL); 521 SIGDELSET(p->p_sigcatch, SIGILL); 522 SIGDELSET(p->p_sigmask, SIGILL); 523 psignal(p, SIGILL); 524 return; 525 } 526 527 /* Translate the signal if appropriate. */ 528 if (p->p_sysent->sv_sigtbl && sig <= p->p_sysent->sv_sigsize) 529 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)]; 530 531 /* Build the argument list for the signal handler. */ 532 sf.sf_signum = sig; 533 sf.sf_scp = (register_t)&fp->sf_siginfo.si_sc; 534 if (SIGISMEMBER(p->p_sigacts->ps_siginfo, sig)) { 535 /* Signal handler installed with SA_SIGINFO. */ 536 sf.sf_arg2 = (register_t)&fp->sf_siginfo; 537 sf.sf_siginfo.si_signo = sig; 538 sf.sf_siginfo.si_code = code; 539 sf.sf_ahu.sf_action = (__osiginfohandler_t *)catcher; 540 } else { 541 /* Old FreeBSD-style arguments. */ 542 sf.sf_arg2 = code; 543 sf.sf_addr = regs->tf_err; 544 sf.sf_ahu.sf_handler = catcher; 545 } 546 547 /* Save most if not all of trap frame. */ 548 sf.sf_siginfo.si_sc.sc_eax = regs->tf_eax; 549 sf.sf_siginfo.si_sc.sc_ebx = regs->tf_ebx; 550 sf.sf_siginfo.si_sc.sc_ecx = regs->tf_ecx; 551 sf.sf_siginfo.si_sc.sc_edx = regs->tf_edx; 552 sf.sf_siginfo.si_sc.sc_esi = regs->tf_esi; 553 sf.sf_siginfo.si_sc.sc_edi = regs->tf_edi; 554 sf.sf_siginfo.si_sc.sc_cs = regs->tf_cs; 555 sf.sf_siginfo.si_sc.sc_ds = regs->tf_ds; 556 sf.sf_siginfo.si_sc.sc_ss = regs->tf_ss; 557 sf.sf_siginfo.si_sc.sc_es = regs->tf_es; 558 sf.sf_siginfo.si_sc.sc_fs = regs->tf_fs; 559 sf.sf_siginfo.si_sc.sc_gs = rgs(); 560 sf.sf_siginfo.si_sc.sc_isp = regs->tf_isp; 561 562 /* Build the signal context to be used by osigreturn(). */ 563 sf.sf_siginfo.si_sc.sc_onstack = oonstack; 564 SIG2OSIG(*mask, sf.sf_siginfo.si_sc.sc_mask); 565 sf.sf_siginfo.si_sc.sc_sp = regs->tf_esp; 566 sf.sf_siginfo.si_sc.sc_fp = regs->tf_ebp; 567 sf.sf_siginfo.si_sc.sc_pc = regs->tf_eip; 568 sf.sf_siginfo.si_sc.sc_ps = regs->tf_eflags; 569 sf.sf_siginfo.si_sc.sc_trapno = regs->tf_trapno; 570 sf.sf_siginfo.si_sc.sc_err = regs->tf_err; 571 572 /* 573 * If we're a vm86 process, we want to save the segment registers. 574 * We also change eflags to be our emulated eflags, not the actual 575 * eflags. 576 */ 577 if (regs->tf_eflags & PSL_VM) { 578 /* XXX confusing names: `tf' isn't a trapframe; `regs' is. */ 579 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs; 580 struct vm86_kernel *vm86 = &p->p_addr->u_pcb.pcb_ext->ext_vm86; 581 582 sf.sf_siginfo.si_sc.sc_gs = tf->tf_vm86_gs; 583 sf.sf_siginfo.si_sc.sc_fs = tf->tf_vm86_fs; 584 sf.sf_siginfo.si_sc.sc_es = tf->tf_vm86_es; 585 sf.sf_siginfo.si_sc.sc_ds = tf->tf_vm86_ds; 586 587 if (vm86->vm86_has_vme == 0) 588 sf.sf_siginfo.si_sc.sc_ps = 589 (tf->tf_eflags & ~(PSL_VIF | PSL_VIP)) | 590 (vm86->vm86_eflags & (PSL_VIF | PSL_VIP)); 591 592 /* See sendsig() for comments. */ 593 tf->tf_eflags &= ~(PSL_VM | PSL_NT | PSL_T | PSL_VIF | PSL_VIP); 594 } 595 596 /* Copy the sigframe out to the user's stack. */ 597 if (copyout(&sf, fp, sizeof(*fp)) != 0) { 598 /* 599 * Something is wrong with the stack pointer. 600 * ...Kill the process. 601 */ 602 sigexit(p, SIGILL); 603 } 604 605 regs->tf_esp = (int)fp; 606 regs->tf_eip = PS_STRINGS - szosigcode; 607 regs->tf_cs = _ucodesel; 608 regs->tf_ds = _udatasel; 609 regs->tf_es = _udatasel; 610 regs->tf_fs = _udatasel; 611 load_gs(_udatasel); 612 regs->tf_ss = _udatasel; 613} 614 615void 616sendsig(catcher, sig, mask, code) 617 sig_t catcher; 618 int sig; 619 sigset_t *mask; 620 u_long code; 621{ 622 struct sigframe sf; 623 struct proc *p; 624 struct sigacts *psp; 625 struct trapframe *regs; 626 struct sigframe *sfp; 627 int oonstack; 628 629 p = curproc; 630 psp = p->p_sigacts; 631 if (SIGISMEMBER(psp->ps_osigset, sig)) { 632 osendsig(catcher, sig, mask, code); 633 return; 634 } 635 regs = p->p_md.md_regs; 636 oonstack = p->p_sigstk.ss_flags & SS_ONSTACK; 637 638 /* Save user context. */ 639 bzero(&sf, sizeof(sf)); 640 sf.sf_uc.uc_sigmask = *mask; 641 sf.sf_uc.uc_stack = p->p_sigstk; 642 sf.sf_uc.uc_mcontext.mc_onstack = oonstack; 643 sf.sf_uc.uc_mcontext.mc_gs = rgs(); 644 bcopy(regs, &sf.sf_uc.uc_mcontext.mc_fs, sizeof(*regs)); 645 646 /* Allocate and validate space for the signal handler context. */ 647 if ((p->p_flag & P_ALTSTACK) != 0 && !oonstack && 648 SIGISMEMBER(psp->ps_sigonstack, sig)) { 649 sfp = (struct sigframe *)(p->p_sigstk.ss_sp + 650 p->p_sigstk.ss_size - sizeof(struct sigframe)); 651 p->p_sigstk.ss_flags |= SS_ONSTACK; 652 } else 653 sfp = (struct sigframe *)regs->tf_esp - 1; 654 655 /* 656 * grow_stack() will return 0 if *sfp does not fit inside the stack 657 * and the stack can not be grown. 658 * useracc() will return FALSE if access is denied. 659 */ 660 if (grow_stack(p, (int)sfp) == 0 || 661 !useracc((caddr_t)sfp, sizeof(*sfp), VM_PROT_WRITE)) { 662 /* 663 * Process has trashed its stack; give it an illegal 664 * instruction to halt it in its tracks. 665 */ 666#ifdef DEBUG 667 printf("process %d has trashed its stack\n", p->p_pid); 668#endif 669 SIGACTION(p, SIGILL) = SIG_DFL; 670 SIGDELSET(p->p_sigignore, SIGILL); 671 SIGDELSET(p->p_sigcatch, SIGILL); 672 SIGDELSET(p->p_sigmask, SIGILL); 673 psignal(p, SIGILL); 674 return; 675 } 676 677 /* Translate the signal if appropriate. */ 678 if (p->p_sysent->sv_sigtbl && sig <= p->p_sysent->sv_sigsize) 679 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)]; 680 681 /* Build the argument list for the signal handler. */ 682 sf.sf_signum = sig; 683 sf.sf_ucontext = (register_t)&sfp->sf_uc; 684 if (SIGISMEMBER(p->p_sigacts->ps_siginfo, sig)) { 685 /* Signal handler installed with SA_SIGINFO. */ 686 sf.sf_siginfo = (register_t)&sfp->sf_si; 687 sf.sf_ahu.sf_action = (__siginfohandler_t *)catcher; 688 689 /* Fill siginfo structure. */ 690 sf.sf_si.si_signo = sig; 691 sf.sf_si.si_code = code; 692 sf.sf_si.si_addr = (void *)regs->tf_err; 693 } else { 694 /* Old FreeBSD-style arguments. */ 695 sf.sf_siginfo = code; 696 sf.sf_addr = regs->tf_err; 697 sf.sf_ahu.sf_handler = catcher; 698 } 699 700 /* 701 * If we're a vm86 process, we want to save the segment registers. 702 * We also change eflags to be our emulated eflags, not the actual 703 * eflags. 704 */ 705 if (regs->tf_eflags & PSL_VM) { 706 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs; 707 struct vm86_kernel *vm86 = &p->p_addr->u_pcb.pcb_ext->ext_vm86; 708 709 sf.sf_uc.uc_mcontext.mc_gs = tf->tf_vm86_gs; 710 sf.sf_uc.uc_mcontext.mc_fs = tf->tf_vm86_fs; 711 sf.sf_uc.uc_mcontext.mc_es = tf->tf_vm86_es; 712 sf.sf_uc.uc_mcontext.mc_ds = tf->tf_vm86_ds; 713 714 if (vm86->vm86_has_vme == 0) 715 sf.sf_uc.uc_mcontext.mc_eflags = 716 (tf->tf_eflags & ~(PSL_VIF | PSL_VIP)) | 717 (vm86->vm86_eflags & (PSL_VIF | PSL_VIP)); 718 719 /* 720 * We should never have PSL_T set when returning from vm86 721 * mode. It may be set here if we deliver a signal before 722 * getting to vm86 mode, so turn it off. 723 * 724 * Clear PSL_NT to inhibit T_TSSFLT faults on return from 725 * syscalls made by the signal handler. This just avoids 726 * wasting time for our lazy fixup of such faults. PSL_NT 727 * does nothing in vm86 mode, but vm86 programs can set it 728 * almost legitimately in probes for old cpu types. 729 */ 730 tf->tf_eflags &= ~(PSL_VM | PSL_NT | PSL_T | PSL_VIF | PSL_VIP); 731 } 732 733 /* Copy the sigframe out to the user's stack. */ 734 if (copyout(&sf, sfp, sizeof(*sfp)) != 0) { 735 /* 736 * Something is wrong with the stack pointer. 737 * ...Kill the process. 738 */ 739 sigexit(p, SIGILL); 740 } 741 742 regs->tf_esp = (int)sfp; 743 regs->tf_eip = PS_STRINGS - *(p->p_sysent->sv_szsigcode); 744 regs->tf_cs = _ucodesel; 745 regs->tf_ds = _udatasel; 746 regs->tf_es = _udatasel; 747 regs->tf_fs = _udatasel; 748 load_gs(_udatasel); 749 regs->tf_ss = _udatasel; 750} 751 752/* 753 * System call to cleanup state after a signal 754 * has been taken. Reset signal mask and 755 * stack state from context left by sendsig (above). 756 * Return to previous pc and psl as specified by 757 * context left by sendsig. Check carefully to 758 * make sure that the user has not modified the 759 * state to gain improper privileges. 760 */ 761int 762osigreturn(p, uap) 763 struct proc *p; 764 struct osigreturn_args /* { 765 struct osigcontext *sigcntxp; 766 } */ *uap; 767{ 768 struct trapframe *regs; 769 struct osigcontext *scp; 770 int eflags; 771 772 regs = p->p_md.md_regs; 773 scp = uap->sigcntxp; 774 if (!useracc((caddr_t)scp, sizeof(*scp), VM_PROT_READ)) 775 return (EFAULT); 776 eflags = scp->sc_ps; 777 if (eflags & PSL_VM) { 778 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs; 779 struct vm86_kernel *vm86; 780 781 /* 782 * if pcb_ext == 0 or vm86_inited == 0, the user hasn't 783 * set up the vm86 area, and we can't enter vm86 mode. 784 */ 785 if (p->p_addr->u_pcb.pcb_ext == 0) 786 return (EINVAL); 787 vm86 = &p->p_addr->u_pcb.pcb_ext->ext_vm86; 788 if (vm86->vm86_inited == 0) 789 return (EINVAL); 790 791 /* Go back to user mode if both flags are set. */ 792 if ((eflags & PSL_VIP) && (eflags & PSL_VIF)) 793 trapsignal(p, SIGBUS, 0); 794 795 if (vm86->vm86_has_vme) { 796 eflags = (tf->tf_eflags & ~VME_USERCHANGE) | 797 (eflags & VME_USERCHANGE) | PSL_VM; 798 } else { 799 vm86->vm86_eflags = eflags; /* save VIF, VIP */ 800 eflags = (tf->tf_eflags & ~VM_USERCHANGE) | (eflags & VM_USERCHANGE) | PSL_VM; 801 } 802 tf->tf_vm86_ds = scp->sc_ds; 803 tf->tf_vm86_es = scp->sc_es; 804 tf->tf_vm86_fs = scp->sc_fs; 805 tf->tf_vm86_gs = scp->sc_gs; 806 tf->tf_ds = _udatasel; 807 tf->tf_es = _udatasel; 808 tf->tf_fs = _udatasel; 809 } else { 810 /* 811 * Don't allow users to change privileged or reserved flags. 812 */ 813 /* 814 * XXX do allow users to change the privileged flag PSL_RF. 815 * The cpu sets PSL_RF in tf_eflags for faults. Debuggers 816 * should sometimes set it there too. tf_eflags is kept in 817 * the signal context during signal handling and there is no 818 * other place to remember it, so the PSL_RF bit may be 819 * corrupted by the signal handler without us knowing. 820 * Corruption of the PSL_RF bit at worst causes one more or 821 * one less debugger trap, so allowing it is fairly harmless. 822 */ 823 if (!EFL_SECURE(eflags & ~PSL_RF, regs->tf_eflags & ~PSL_RF)) { 824 return (EINVAL); 825 } 826 827 /* 828 * Don't allow users to load a valid privileged %cs. Let the 829 * hardware check for invalid selectors, excess privilege in 830 * other selectors, invalid %eip's and invalid %esp's. 831 */ 832 if (!CS_SECURE(scp->sc_cs)) { 833 trapsignal(p, SIGBUS, T_PROTFLT); 834 return (EINVAL); 835 } 836 regs->tf_ds = scp->sc_ds; 837 regs->tf_es = scp->sc_es; 838 regs->tf_fs = scp->sc_fs; 839 } 840 841 /* Restore remaining registers. */ 842 regs->tf_eax = scp->sc_eax; 843 regs->tf_ebx = scp->sc_ebx; 844 regs->tf_ecx = scp->sc_ecx; 845 regs->tf_edx = scp->sc_edx; 846 regs->tf_esi = scp->sc_esi; 847 regs->tf_edi = scp->sc_edi; 848 regs->tf_cs = scp->sc_cs; 849 regs->tf_ss = scp->sc_ss; 850 regs->tf_isp = scp->sc_isp; 851 852 if (scp->sc_onstack & 01) 853 p->p_sigstk.ss_flags |= SS_ONSTACK; 854 else 855 p->p_sigstk.ss_flags &= ~SS_ONSTACK; 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 if (!useracc((caddr_t)ucp, sizeof(struct osigcontext), VM_PROT_READ)) 878 return (EFAULT); 879 if (((struct osigcontext *)ucp)->sc_trapno == 0x01d516) 880 return (osigreturn(p, (struct osigreturn_args *)uap)); 881 882 /* 883 * Since ucp is not an osigcontext but a ucontext_t, we have to 884 * check again if all of it is accessible. A ucontext_t is 885 * much larger, so instead of just checking for the pointer 886 * being valid for the size of an osigcontext, now check for 887 * it being valid for a whole, new-style ucontext_t. 888 */ 889 if (!useracc((caddr_t)ucp, sizeof(*ucp), VM_PROT_READ)) 890 return (EFAULT); 891 892 regs = p->p_md.md_regs; 893 eflags = ucp->uc_mcontext.mc_eflags; 894 if (eflags & PSL_VM) { 895 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs; 896 struct vm86_kernel *vm86; 897 898 /* 899 * if pcb_ext == 0 or vm86_inited == 0, the user hasn't 900 * set up the vm86 area, and we can't enter vm86 mode. 901 */ 902 if (p->p_addr->u_pcb.pcb_ext == 0) 903 return (EINVAL); 904 vm86 = &p->p_addr->u_pcb.pcb_ext->ext_vm86; 905 if (vm86->vm86_inited == 0) 906 return (EINVAL); 907 908 /* Go back to user mode if both flags are set. */ 909 if ((eflags & PSL_VIP) && (eflags & PSL_VIF)) 910 trapsignal(p, SIGBUS, 0); 911 912 if (vm86->vm86_has_vme) { 913 eflags = (tf->tf_eflags & ~VME_USERCHANGE) | 914 (eflags & VME_USERCHANGE) | PSL_VM; 915 } else { 916 vm86->vm86_eflags = eflags; /* save VIF, VIP */ 917 eflags = (tf->tf_eflags & ~VM_USERCHANGE) | (eflags & VM_USERCHANGE) | PSL_VM; 918 } 919 bcopy(&ucp->uc_mcontext.mc_fs, tf, sizeof(struct trapframe)); 920 tf->tf_eflags = eflags; 921 tf->tf_vm86_ds = tf->tf_ds; 922 tf->tf_vm86_es = tf->tf_es; 923 tf->tf_vm86_fs = tf->tf_fs; 924 tf->tf_vm86_gs = ucp->uc_mcontext.mc_gs; 925 tf->tf_ds = _udatasel; 926 tf->tf_es = _udatasel; 927 tf->tf_fs = _udatasel; 928 } else { 929 /* 930 * Don't allow users to change privileged or reserved flags. 931 */ 932 /* 933 * XXX do allow users to change the privileged flag PSL_RF. 934 * The cpu sets PSL_RF in tf_eflags for faults. Debuggers 935 * should sometimes set it there too. tf_eflags is kept in 936 * the signal context during signal handling and there is no 937 * other place to remember it, so the PSL_RF bit may be 938 * corrupted by the signal handler without us knowing. 939 * Corruption of the PSL_RF bit at worst causes one more or 940 * one less debugger trap, so allowing it is fairly harmless. 941 */ 942 if (!EFL_SECURE(eflags & ~PSL_RF, regs->tf_eflags & ~PSL_RF)) { 943 printf("sigreturn: eflags = 0x%x\n", eflags); 944 return (EINVAL); 945 } 946 947 /* 948 * Don't allow users to load a valid privileged %cs. Let the 949 * hardware check for invalid selectors, excess privilege in 950 * other selectors, invalid %eip's and invalid %esp's. 951 */ 952 cs = ucp->uc_mcontext.mc_cs; 953 if (!CS_SECURE(cs)) { 954 printf("sigreturn: cs = 0x%x\n", cs); 955 trapsignal(p, SIGBUS, T_PROTFLT); 956 return (EINVAL); 957 } 958 959 bcopy(&ucp->uc_mcontext.mc_fs, regs, sizeof(*regs)); 960 } 961 if (ucp->uc_mcontext.mc_onstack & 1) 962 p->p_sigstk.ss_flags |= SS_ONSTACK; 963 else 964 p->p_sigstk.ss_flags &= ~SS_ONSTACK; 965 966 p->p_sigmask = ucp->uc_sigmask; 967 SIG_CANTMASK(p->p_sigmask); 968 return (EJUSTRETURN); 969} 970 971/* 972 * Machine dependent boot() routine 973 * 974 * I haven't seen anything to put here yet 975 * Possibly some stuff might be grafted back here from boot() 976 */ 977void 978cpu_boot(int howto) 979{ 980} 981 982/* 983 * Shutdown the CPU as much as possible 984 */ 985void 986cpu_halt(void) 987{ 988 for (;;) 989 __asm__ ("hlt"); 990} 991 992/* 993 * Hook to idle the CPU when possible. This currently only works in 994 * the !SMP case, as there is no clean way to ensure that a CPU will be 995 * woken when there is work available for it. 996 */ 997static int cpu_idle_hlt = 1; 998SYSCTL_INT(_machdep, OID_AUTO, cpu_idle_hlt, CTLFLAG_RW, 999 &cpu_idle_hlt, 0, "Idle loop HLT enable"); 1000 1001/* 1002 * Note that we have to be careful here to avoid a race between checking 1003 * procrunnable() and actually halting. If we don't do this, we may waste 1004 * the time between calling hlt and the next interrupt even though there 1005 * is a runnable process. 1006 */ 1007void 1008cpu_idle(void) 1009{ 1010#ifndef SMP 1011 if (cpu_idle_hlt) { 1012 disable_intr(); 1013 if (procrunnable()) 1014 enable_intr(); 1015 else { 1016 enable_intr(); 1017 __asm __volatile("hlt"); 1018 } 1019 } 1020#endif 1021} 1022 1023/* 1024 * Clear registers on exec 1025 */ 1026void 1027setregs(p, entry, stack, ps_strings) 1028 struct proc *p; 1029 u_long entry; 1030 u_long stack; 1031 u_long ps_strings; 1032{ 1033 struct trapframe *regs = p->p_md.md_regs; 1034 struct pcb *pcb = &p->p_addr->u_pcb; 1035 1036#ifdef USER_LDT 1037 /* was i386_user_cleanup() in NetBSD */ 1038 user_ldt_free(pcb); 1039#endif 1040 1041 bzero((char *)regs, sizeof(struct trapframe)); 1042 regs->tf_eip = entry; 1043 regs->tf_esp = stack; 1044 regs->tf_eflags = PSL_USER | (regs->tf_eflags & PSL_T); 1045 regs->tf_ss = _udatasel; 1046 regs->tf_ds = _udatasel; 1047 regs->tf_es = _udatasel; 1048 regs->tf_fs = _udatasel; 1049 regs->tf_cs = _ucodesel; 1050 1051 /* PS_STRINGS value for BSD/OS binaries. It is 0 for non-BSD/OS. */ 1052 regs->tf_ebx = ps_strings; 1053 1054 /* reset %gs as well */ 1055 if (pcb == curpcb) 1056 load_gs(_udatasel); 1057 else 1058 pcb->pcb_gs = _udatasel; 1059 1060 /* 1061 * Reset the hardware debug registers if they were in use. 1062 * They won't have any meaning for the newly exec'd process. 1063 */ 1064 if (pcb->pcb_flags & PCB_DBREGS) { 1065 pcb->pcb_dr0 = 0; 1066 pcb->pcb_dr1 = 0; 1067 pcb->pcb_dr2 = 0; 1068 pcb->pcb_dr3 = 0; 1069 pcb->pcb_dr6 = 0; 1070 pcb->pcb_dr7 = 0; 1071 if (pcb == curpcb) { 1072 /* 1073 * Clear the debug registers on the running 1074 * CPU, otherwise they will end up affecting 1075 * the next process we switch to. 1076 */ 1077 reset_dbregs(); 1078 } 1079 pcb->pcb_flags &= ~PCB_DBREGS; 1080 } 1081 1082 /* 1083 * Initialize the math emulator (if any) for the current process. 1084 * Actually, just clear the bit that says that the emulator has 1085 * been initialized. Initialization is delayed until the process 1086 * traps to the emulator (if it is done at all) mainly because 1087 * emulators don't provide an entry point for initialization. 1088 */ 1089 p->p_addr->u_pcb.pcb_flags &= ~FP_SOFTFP; 1090 1091 /* 1092 * Arrange to trap the next npx or `fwait' instruction (see npx.c 1093 * for why fwait must be trapped at least if there is an npx or an 1094 * emulator). This is mainly to handle the case where npx0 is not 1095 * configured, since the npx routines normally set up the trap 1096 * otherwise. It should be done only at boot time, but doing it 1097 * here allows modifying `npx_exists' for testing the emulator on 1098 * systems with an npx. 1099 */ 1100 load_cr0(rcr0() | CR0_MP | CR0_TS); 1101 1102#if NNPX > 0 1103 /* Initialize the npx (if any) for the current process. */ 1104 npxinit(__INITIAL_NPXCW__); 1105#endif 1106 1107 /* 1108 * XXX - Linux emulator 1109 * Make sure sure edx is 0x0 on entry. Linux binaries depend 1110 * on it. 1111 */ 1112 p->p_retval[1] = 0; 1113} 1114 1115void 1116cpu_setregs(void) 1117{ 1118 unsigned int cr0; 1119 1120 cr0 = rcr0(); 1121 cr0 |= CR0_NE; /* Done by npxinit() */ 1122 cr0 |= CR0_MP | CR0_TS; /* Done at every execve() too. */ 1123#ifdef I386_CPU 1124 if (cpu_class != CPUCLASS_386) 1125#endif 1126 cr0 |= CR0_WP | CR0_AM; 1127 load_cr0(cr0); 1128 load_gs(_udatasel); 1129} 1130 1131static int 1132sysctl_machdep_adjkerntz(SYSCTL_HANDLER_ARGS) 1133{ 1134 int error; 1135 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, 1136 req); 1137 if (!error && req->newptr) 1138 resettodr(); 1139 return (error); 1140} 1141 1142SYSCTL_PROC(_machdep, CPU_ADJKERNTZ, adjkerntz, CTLTYPE_INT|CTLFLAG_RW, 1143 &adjkerntz, 0, sysctl_machdep_adjkerntz, "I", ""); 1144 1145SYSCTL_INT(_machdep, CPU_DISRTCSET, disable_rtc_set, 1146 CTLFLAG_RW, &disable_rtc_set, 0, ""); 1147 1148SYSCTL_STRUCT(_machdep, CPU_BOOTINFO, bootinfo, 1149 CTLFLAG_RD, &bootinfo, bootinfo, ""); 1150 1151SYSCTL_INT(_machdep, CPU_WALLCLOCK, wall_cmos_clock, 1152 CTLFLAG_RW, &wall_cmos_clock, 0, ""); 1153 1154/* 1155 * Initialize 386 and configure to run kernel 1156 */ 1157 1158/* 1159 * Initialize segments & interrupt table 1160 */ 1161 1162int _default_ldt; 1163union descriptor gdt[NGDT * MAXCPU]; /* global descriptor table */ 1164static struct gate_descriptor idt0[NIDT]; 1165struct gate_descriptor *idt = &idt0[0]; /* interrupt descriptor table */ 1166union descriptor ldt[NLDT]; /* local descriptor table */ 1167#ifdef SMP 1168/* table descriptors - used to load tables by microp */ 1169struct region_descriptor r_gdt, r_idt; 1170#endif 1171 1172#ifndef SMP 1173extern struct segment_descriptor common_tssd, *tss_gdt; 1174#endif 1175int private_tss; /* flag indicating private tss */ 1176 1177#if defined(I586_CPU) && !defined(NO_F00F_HACK) 1178extern int has_f00f_bug; 1179#endif 1180 1181static struct i386tss dblfault_tss; 1182static char dblfault_stack[PAGE_SIZE]; 1183 1184extern struct user *proc0paddr; 1185 1186 1187/* software prototypes -- in more palatable form */ 1188struct soft_segment_descriptor gdt_segs[] = { 1189/* GNULL_SEL 0 Null Descriptor */ 1190{ 0x0, /* segment base address */ 1191 0x0, /* length */ 1192 0, /* segment type */ 1193 0, /* segment descriptor priority level */ 1194 0, /* segment descriptor present */ 1195 0, 0, 1196 0, /* default 32 vs 16 bit size */ 1197 0 /* limit granularity (byte/page units)*/ }, 1198/* GCODE_SEL 1 Code Descriptor for kernel */ 1199{ 0x0, /* segment base address */ 1200 0xfffff, /* length - all address space */ 1201 SDT_MEMERA, /* segment type */ 1202 0, /* segment descriptor priority level */ 1203 1, /* segment descriptor present */ 1204 0, 0, 1205 1, /* default 32 vs 16 bit size */ 1206 1 /* limit granularity (byte/page units)*/ }, 1207/* GDATA_SEL 2 Data Descriptor for kernel */ 1208{ 0x0, /* segment base address */ 1209 0xfffff, /* length - all address space */ 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/* GPRIV_SEL 3 SMP Per-Processor Private Data Descriptor */ 1217{ 0x0, /* segment base address */ 1218 0xfffff, /* length - all address space */ 1219 SDT_MEMRWA, /* segment type */ 1220 0, /* segment descriptor priority level */ 1221 1, /* segment descriptor present */ 1222 0, 0, 1223 1, /* default 32 vs 16 bit size */ 1224 1 /* limit granularity (byte/page units)*/ }, 1225/* GPROC0_SEL 4 Proc 0 Tss Descriptor */ 1226{ 1227 0x0, /* segment base address */ 1228 sizeof(struct i386tss)-1,/* length - all address space */ 1229 SDT_SYS386TSS, /* segment type */ 1230 0, /* segment descriptor priority level */ 1231 1, /* segment descriptor present */ 1232 0, 0, 1233 0, /* unused - default 32 vs 16 bit size */ 1234 0 /* limit granularity (byte/page units)*/ }, 1235/* GLDT_SEL 5 LDT Descriptor */ 1236{ (int) ldt, /* segment base address */ 1237 sizeof(ldt)-1, /* length - all address space */ 1238 SDT_SYSLDT, /* segment type */ 1239 SEL_UPL, /* segment descriptor priority level */ 1240 1, /* segment descriptor present */ 1241 0, 0, 1242 0, /* unused - default 32 vs 16 bit size */ 1243 0 /* limit granularity (byte/page units)*/ }, 1244/* GUSERLDT_SEL 6 User LDT Descriptor per process */ 1245{ (int) ldt, /* segment base address */ 1246 (512 * sizeof(union descriptor)-1), /* length */ 1247 SDT_SYSLDT, /* segment type */ 1248 0, /* segment descriptor priority level */ 1249 1, /* segment descriptor present */ 1250 0, 0, 1251 0, /* unused - default 32 vs 16 bit size */ 1252 0 /* limit granularity (byte/page units)*/ }, 1253/* GTGATE_SEL 7 Null Descriptor - Placeholder */ 1254{ 0x0, /* segment base address */ 1255 0x0, /* length - all address space */ 1256 0, /* segment type */ 1257 0, /* segment descriptor priority level */ 1258 0, /* segment descriptor present */ 1259 0, 0, 1260 0, /* default 32 vs 16 bit size */ 1261 0 /* limit granularity (byte/page units)*/ }, 1262/* GBIOSLOWMEM_SEL 8 BIOS access to realmode segment 0x40, must be #8 in GDT */ 1263{ 0x400, /* segment base address */ 1264 0xfffff, /* length */ 1265 SDT_MEMRWA, /* segment type */ 1266 0, /* segment descriptor priority level */ 1267 1, /* segment descriptor present */ 1268 0, 0, 1269 1, /* default 32 vs 16 bit size */ 1270 1 /* limit granularity (byte/page units)*/ }, 1271/* GPANIC_SEL 9 Panic Tss Descriptor */ 1272{ (int) &dblfault_tss, /* segment base address */ 1273 sizeof(struct i386tss)-1,/* length - all address space */ 1274 SDT_SYS386TSS, /* segment type */ 1275 0, /* segment descriptor priority level */ 1276 1, /* segment descriptor present */ 1277 0, 0, 1278 0, /* unused - default 32 vs 16 bit size */ 1279 0 /* limit granularity (byte/page units)*/ }, 1280/* GBIOSCODE32_SEL 10 BIOS 32-bit interface (32bit Code) */ 1281{ 0, /* segment base address (overwritten) */ 1282 0xfffff, /* length */ 1283 SDT_MEMERA, /* segment type */ 1284 0, /* segment descriptor priority level */ 1285 1, /* segment descriptor present */ 1286 0, 0, 1287 0, /* default 32 vs 16 bit size */ 1288 1 /* limit granularity (byte/page units)*/ }, 1289/* GBIOSCODE16_SEL 11 BIOS 32-bit interface (16bit Code) */ 1290{ 0, /* segment base address (overwritten) */ 1291 0xfffff, /* length */ 1292 SDT_MEMERA, /* segment type */ 1293 0, /* segment descriptor priority level */ 1294 1, /* segment descriptor present */ 1295 0, 0, 1296 0, /* default 32 vs 16 bit size */ 1297 1 /* limit granularity (byte/page units)*/ }, 1298/* GBIOSDATA_SEL 12 BIOS 32-bit interface (Data) */ 1299{ 0, /* segment base address (overwritten) */ 1300 0xfffff, /* length */ 1301 SDT_MEMRWA, /* segment type */ 1302 0, /* segment descriptor priority level */ 1303 1, /* segment descriptor present */ 1304 0, 0, 1305 1, /* default 32 vs 16 bit size */ 1306 1 /* limit granularity (byte/page units)*/ }, 1307/* GBIOSUTIL_SEL 13 BIOS 16-bit interface (Utility) */ 1308{ 0, /* segment base address (overwritten) */ 1309 0xfffff, /* length */ 1310 SDT_MEMRWA, /* segment type */ 1311 0, /* segment descriptor priority level */ 1312 1, /* segment descriptor present */ 1313 0, 0, 1314 0, /* default 32 vs 16 bit size */ 1315 1 /* limit granularity (byte/page units)*/ }, 1316/* GBIOSARGS_SEL 14 BIOS 16-bit interface (Arguments) */ 1317{ 0, /* segment base address (overwritten) */ 1318 0xfffff, /* length */ 1319 SDT_MEMRWA, /* segment type */ 1320 0, /* segment descriptor priority level */ 1321 1, /* segment descriptor present */ 1322 0, 0, 1323 0, /* default 32 vs 16 bit size */ 1324 1 /* limit granularity (byte/page units)*/ }, 1325}; 1326 1327static struct soft_segment_descriptor ldt_segs[] = { 1328 /* Null Descriptor - overwritten by call gate */ 1329{ 0x0, /* segment base address */ 1330 0x0, /* length - all address space */ 1331 0, /* segment type */ 1332 0, /* segment descriptor priority level */ 1333 0, /* segment descriptor present */ 1334 0, 0, 1335 0, /* default 32 vs 16 bit size */ 1336 0 /* limit granularity (byte/page units)*/ }, 1337 /* Null Descriptor - overwritten by call gate */ 1338{ 0x0, /* segment base address */ 1339 0x0, /* length - all address space */ 1340 0, /* segment type */ 1341 0, /* segment descriptor priority level */ 1342 0, /* segment descriptor present */ 1343 0, 0, 1344 0, /* default 32 vs 16 bit size */ 1345 0 /* limit granularity (byte/page units)*/ }, 1346 /* Null Descriptor - overwritten by call gate */ 1347{ 0x0, /* segment base address */ 1348 0x0, /* length - all address space */ 1349 0, /* segment type */ 1350 0, /* segment descriptor priority level */ 1351 0, /* segment descriptor present */ 1352 0, 0, 1353 0, /* default 32 vs 16 bit size */ 1354 0 /* limit granularity (byte/page units)*/ }, 1355 /* Code Descriptor for user */ 1356{ 0x0, /* segment base address */ 1357 0xfffff, /* length - all address space */ 1358 SDT_MEMERA, /* segment type */ 1359 SEL_UPL, /* segment descriptor priority level */ 1360 1, /* segment descriptor present */ 1361 0, 0, 1362 1, /* default 32 vs 16 bit size */ 1363 1 /* limit granularity (byte/page units)*/ }, 1364 /* Null Descriptor - overwritten by call gate */ 1365{ 0x0, /* segment base address */ 1366 0x0, /* length - all address space */ 1367 0, /* segment type */ 1368 0, /* segment descriptor priority level */ 1369 0, /* segment descriptor present */ 1370 0, 0, 1371 0, /* default 32 vs 16 bit size */ 1372 0 /* limit granularity (byte/page units)*/ }, 1373 /* Data Descriptor for user */ 1374{ 0x0, /* segment base address */ 1375 0xfffff, /* length - all address space */ 1376 SDT_MEMRWA, /* segment type */ 1377 SEL_UPL, /* segment descriptor priority level */ 1378 1, /* segment descriptor present */ 1379 0, 0, 1380 1, /* default 32 vs 16 bit size */ 1381 1 /* limit granularity (byte/page units)*/ }, 1382}; 1383 1384void 1385setidt(idx, func, typ, dpl, selec) 1386 int idx; 1387 inthand_t *func; 1388 int typ; 1389 int dpl; 1390 int selec; 1391{ 1392 struct gate_descriptor *ip; 1393 1394 ip = idt + idx; 1395 ip->gd_looffset = (int)func; 1396 ip->gd_selector = selec; 1397 ip->gd_stkcpy = 0; 1398 ip->gd_xx = 0; 1399 ip->gd_type = typ; 1400 ip->gd_dpl = dpl; 1401 ip->gd_p = 1; 1402 ip->gd_hioffset = ((int)func)>>16 ; 1403} 1404 1405#define IDTVEC(name) __CONCAT(X,name) 1406 1407extern inthand_t 1408 IDTVEC(div), IDTVEC(dbg), IDTVEC(nmi), IDTVEC(bpt), IDTVEC(ofl), 1409 IDTVEC(bnd), IDTVEC(ill), IDTVEC(dna), IDTVEC(fpusegm), 1410 IDTVEC(tss), IDTVEC(missing), IDTVEC(stk), IDTVEC(prot), 1411 IDTVEC(page), IDTVEC(mchk), IDTVEC(rsvd), IDTVEC(fpu), IDTVEC(align), 1412 IDTVEC(syscall), IDTVEC(int0x80_syscall); 1413 1414void 1415sdtossd(sd, ssd) 1416 struct segment_descriptor *sd; 1417 struct soft_segment_descriptor *ssd; 1418{ 1419 ssd->ssd_base = (sd->sd_hibase << 24) | sd->sd_lobase; 1420 ssd->ssd_limit = (sd->sd_hilimit << 16) | sd->sd_lolimit; 1421 ssd->ssd_type = sd->sd_type; 1422 ssd->ssd_dpl = sd->sd_dpl; 1423 ssd->ssd_p = sd->sd_p; 1424 ssd->ssd_def32 = sd->sd_def32; 1425 ssd->ssd_gran = sd->sd_gran; 1426} 1427 1428#define PHYSMAP_SIZE (2 * 8) 1429 1430/* 1431 * Populate the (physmap) array with base/bound pairs describing the 1432 * available physical memory in the system, then test this memory and 1433 * build the phys_avail array describing the actually-available memory. 1434 * 1435 * If we cannot accurately determine the physical memory map, then use 1436 * value from the 0xE801 call, and failing that, the RTC. 1437 * 1438 * Total memory size may be set by the kernel environment variable 1439 * hw.physmem or the compile-time define MAXMEM. 1440 */ 1441static void 1442getmemsize(int first) 1443{ 1444 int i, physmap_idx, pa_indx; 1445 u_int basemem, extmem; 1446 struct vm86frame vmf; 1447 struct vm86context vmc; 1448 vm_offset_t pa, physmap[PHYSMAP_SIZE]; 1449 pt_entry_t pte; 1450 const char *cp; 1451 struct bios_smap *smap; 1452 1453 bzero(&vmf, sizeof(struct vm86frame)); 1454 bzero(physmap, sizeof(physmap)); 1455 1456 /* 1457 * Perform "base memory" related probes & setup 1458 */ 1459 vm86_intcall(0x12, &vmf); 1460 basemem = vmf.vmf_ax; 1461 if (basemem > 640) { 1462 printf("Preposterous BIOS basemem of %uK, truncating to 640K\n", 1463 basemem); 1464 basemem = 640; 1465 } 1466 1467 /* 1468 * XXX if biosbasemem is now < 640, there is a `hole' 1469 * between the end of base memory and the start of 1470 * ISA memory. The hole may be empty or it may 1471 * contain BIOS code or data. Map it read/write so 1472 * that the BIOS can write to it. (Memory from 0 to 1473 * the physical end of the kernel is mapped read-only 1474 * to begin with and then parts of it are remapped. 1475 * The parts that aren't remapped form holes that 1476 * remain read-only and are unused by the kernel. 1477 * The base memory area is below the physical end of 1478 * the kernel and right now forms a read-only hole. 1479 * The part of it from PAGE_SIZE to 1480 * (trunc_page(biosbasemem * 1024) - 1) will be 1481 * remapped and used by the kernel later.) 1482 * 1483 * This code is similar to the code used in 1484 * pmap_mapdev, but since no memory needs to be 1485 * allocated we simply change the mapping. 1486 */ 1487 for (pa = trunc_page(basemem * 1024); 1488 pa < ISA_HOLE_START; pa += PAGE_SIZE) { 1489 pte = (pt_entry_t)vtopte(pa + KERNBASE); 1490 *pte = pa | PG_RW | PG_V; 1491 } 1492 1493 /* 1494 * if basemem != 640, map pages r/w into vm86 page table so 1495 * that the bios can scribble on it. 1496 */ 1497 pte = (pt_entry_t)vm86paddr; 1498 for (i = basemem / 4; i < 160; i++) 1499 pte[i] = (i << PAGE_SHIFT) | PG_V | PG_RW | PG_U; 1500 1501 /* 1502 * map page 1 R/W into the kernel page table so we can use it 1503 * as a buffer. The kernel will unmap this page later. 1504 */ 1505 pte = (pt_entry_t)vtopte(KERNBASE + (1 << PAGE_SHIFT)); 1506 *pte = (1 << PAGE_SHIFT) | PG_RW | PG_V; 1507 1508 /* 1509 * get memory map with INT 15:E820 1510 */ 1511 vmc.npages = 0; 1512 smap = (void *)vm86_addpage(&vmc, 1, KERNBASE + (1 << PAGE_SHIFT)); 1513 vm86_getptr(&vmc, (vm_offset_t)smap, &vmf.vmf_es, &vmf.vmf_di); 1514 1515 physmap_idx = 0; 1516 vmf.vmf_ebx = 0; 1517 do { 1518 vmf.vmf_eax = 0xE820; 1519 vmf.vmf_edx = SMAP_SIG; 1520 vmf.vmf_ecx = sizeof(struct bios_smap); 1521 i = vm86_datacall(0x15, &vmf, &vmc); 1522 if (i || vmf.vmf_eax != SMAP_SIG) 1523 break; 1524 if (boothowto & RB_VERBOSE) 1525 printf("SMAP type=%02x base=%08x %08x len=%08x %08x\n", 1526 smap->type, 1527 *(u_int32_t *)((char *)&smap->base + 4), 1528 (u_int32_t)smap->base, 1529 *(u_int32_t *)((char *)&smap->length + 4), 1530 (u_int32_t)smap->length); 1531 1532 if (smap->type != 0x01) 1533 goto next_run; 1534 1535 if (smap->length == 0) 1536 goto next_run; 1537 1538 if (smap->base >= 0xffffffff) { 1539 printf("%uK of memory above 4GB ignored\n", 1540 (u_int)(smap->length / 1024)); 1541 goto next_run; 1542 } 1543 1544 for (i = 0; i <= physmap_idx; i += 2) { 1545 if (smap->base < physmap[i + 1]) { 1546 if (boothowto & RB_VERBOSE) 1547 printf( 1548 "Overlapping or non-montonic memory region, ignoring second region\n"); 1549 goto next_run; 1550 } 1551 } 1552 1553 if (smap->base == physmap[physmap_idx + 1]) { 1554 physmap[physmap_idx + 1] += smap->length; 1555 goto next_run; 1556 } 1557 1558 physmap_idx += 2; 1559 if (physmap_idx == PHYSMAP_SIZE) { 1560 printf( 1561 "Too many segments in the physical address map, giving up\n"); 1562 break; 1563 } 1564 physmap[physmap_idx] = smap->base; 1565 physmap[physmap_idx + 1] = smap->base + smap->length; 1566next_run: 1567 } while (vmf.vmf_ebx != 0); 1568 1569 if (physmap[1] != 0) 1570 goto physmap_done; 1571 1572 /* 1573 * If we failed above, try memory map with INT 15:E801 1574 */ 1575 vmf.vmf_ax = 0xE801; 1576 if (vm86_intcall(0x15, &vmf) == 0) { 1577 extmem = vmf.vmf_cx + vmf.vmf_dx * 64; 1578 } else { 1579#if 0 1580 vmf.vmf_ah = 0x88; 1581 vm86_intcall(0x15, &vmf); 1582 extmem = vmf.vmf_ax; 1583#else 1584 /* 1585 * Prefer the RTC value for extended memory. 1586 */ 1587 extmem = rtcin(RTC_EXTLO) + (rtcin(RTC_EXTHI) << 8); 1588#endif 1589 } 1590 1591 /* 1592 * Special hack for chipsets that still remap the 384k hole when 1593 * there's 16MB of memory - this really confuses people that 1594 * are trying to use bus mastering ISA controllers with the 1595 * "16MB limit"; they only have 16MB, but the remapping puts 1596 * them beyond the limit. 1597 * 1598 * If extended memory is between 15-16MB (16-17MB phys address range), 1599 * chop it to 15MB. 1600 */ 1601 if ((extmem > 15 * 1024) && (extmem < 16 * 1024)) 1602 extmem = 15 * 1024; 1603 1604 physmap[0] = 0; 1605 physmap[1] = basemem * 1024; 1606 physmap_idx = 2; 1607 physmap[physmap_idx] = 0x100000; 1608 physmap[physmap_idx + 1] = physmap[physmap_idx] + extmem * 1024; 1609 1610physmap_done: 1611 /* 1612 * Now, physmap contains a map of physical memory. 1613 */ 1614 1615#ifdef SMP 1616 /* make hole for AP bootstrap code */ 1617 physmap[1] = mp_bootaddress(physmap[1] / 1024); 1618 1619 /* look for the MP hardware - needed for apic addresses */ 1620 mp_probe(); 1621#endif 1622 1623 /* 1624 * Maxmem isn't the "maximum memory", it's one larger than the 1625 * highest page of the physical address space. It should be 1626 * called something like "Maxphyspage". We may adjust this 1627 * based on ``hw.physmem'' and the results of the memory test. 1628 */ 1629 Maxmem = atop(physmap[physmap_idx + 1]); 1630 1631#ifdef MAXMEM 1632 Maxmem = MAXMEM / 4; 1633#endif 1634 1635 /* 1636 * hw.maxmem is a size in bytes; we also allow k, m, and g suffixes 1637 * for the appropriate modifiers. This overrides MAXMEM. 1638 */ 1639 if ((cp = getenv("hw.physmem")) != NULL) { 1640 u_int64_t AllowMem, sanity; 1641 char *ep; 1642 1643 sanity = AllowMem = strtouq(cp, &ep, 0); 1644 if ((ep != cp) && (*ep != 0)) { 1645 switch(*ep) { 1646 case 'g': 1647 case 'G': 1648 AllowMem <<= 10; 1649 case 'm': 1650 case 'M': 1651 AllowMem <<= 10; 1652 case 'k': 1653 case 'K': 1654 AllowMem <<= 10; 1655 break; 1656 default: 1657 AllowMem = sanity = 0; 1658 } 1659 if (AllowMem < sanity) 1660 AllowMem = 0; 1661 } 1662 if (AllowMem == 0) 1663 printf("Ignoring invalid memory size of '%s'\n", cp); 1664 else 1665 Maxmem = atop(AllowMem); 1666 } 1667 1668 if (atop(physmap[physmap_idx + 1]) != Maxmem && 1669 (boothowto & RB_VERBOSE)) 1670 printf("Physical memory use set to %uK\n", Maxmem * 4); 1671 1672 /* 1673 * If Maxmem has been increased beyond what the system has detected, 1674 * extend the last memory segment to the new limit. 1675 */ 1676 if (atop(physmap[physmap_idx + 1]) < Maxmem) 1677 physmap[physmap_idx + 1] = ptoa(Maxmem); 1678 1679 /* call pmap initialization to make new kernel address space */ 1680 pmap_bootstrap(first, 0); 1681 1682 /* 1683 * Size up each available chunk of physical memory. 1684 */ 1685 physmap[0] = PAGE_SIZE; /* mask off page 0 */ 1686 pa_indx = 0; 1687 phys_avail[pa_indx++] = physmap[0]; 1688 phys_avail[pa_indx] = physmap[0]; 1689#if 0 1690 pte = (pt_entry_t)vtopte(KERNBASE); 1691#else 1692 pte = (pt_entry_t)CMAP1; 1693#endif 1694 1695 /* 1696 * physmap is in bytes, so when converting to page boundaries, 1697 * round up the start address and round down the end address. 1698 */ 1699 for (i = 0; i <= physmap_idx; i += 2) { 1700 vm_offset_t end; 1701 1702 end = ptoa(Maxmem); 1703 if (physmap[i + 1] < end) 1704 end = trunc_page(physmap[i + 1]); 1705 for (pa = round_page(physmap[i]); pa < end; pa += PAGE_SIZE) { 1706 int tmp, page_bad; 1707#if 0 1708 int *ptr = 0; 1709#else 1710 int *ptr = (int *)CADDR1; 1711#endif 1712 1713 /* 1714 * block out kernel memory as not available. 1715 */ 1716 if (pa >= 0x100000 && pa < first) 1717 continue; 1718 1719 page_bad = FALSE; 1720 1721 /* 1722 * map page into kernel: valid, read/write,non-cacheable 1723 */ 1724 *pte = pa | PG_V | PG_RW | PG_N; 1725 invltlb(); 1726 1727 tmp = *(int *)ptr; 1728 /* 1729 * Test for alternating 1's and 0's 1730 */ 1731 *(volatile int *)ptr = 0xaaaaaaaa; 1732 if (*(volatile int *)ptr != 0xaaaaaaaa) { 1733 page_bad = TRUE; 1734 } 1735 /* 1736 * Test for alternating 0's and 1's 1737 */ 1738 *(volatile int *)ptr = 0x55555555; 1739 if (*(volatile int *)ptr != 0x55555555) { 1740 page_bad = TRUE; 1741 } 1742 /* 1743 * Test for all 1's 1744 */ 1745 *(volatile int *)ptr = 0xffffffff; 1746 if (*(volatile int *)ptr != 0xffffffff) { 1747 page_bad = TRUE; 1748 } 1749 /* 1750 * Test for all 0's 1751 */ 1752 *(volatile int *)ptr = 0x0; 1753 if (*(volatile int *)ptr != 0x0) { 1754 page_bad = TRUE; 1755 } 1756 /* 1757 * Restore original value. 1758 */ 1759 *(int *)ptr = tmp; 1760 1761 /* 1762 * Adjust array of valid/good pages. 1763 */ 1764 if (page_bad == TRUE) { 1765 continue; 1766 } 1767 /* 1768 * If this good page is a continuation of the 1769 * previous set of good pages, then just increase 1770 * the end pointer. Otherwise start a new chunk. 1771 * Note that "end" points one higher than end, 1772 * making the range >= start and < end. 1773 * If we're also doing a speculative memory 1774 * test and we at or past the end, bump up Maxmem 1775 * so that we keep going. The first bad page 1776 * will terminate the loop. 1777 */ 1778 if (phys_avail[pa_indx] == pa) { 1779 phys_avail[pa_indx] += PAGE_SIZE; 1780 } else { 1781 pa_indx++; 1782 if (pa_indx == PHYS_AVAIL_ARRAY_END) { 1783 printf("Too many holes in the physical address space, giving up\n"); 1784 pa_indx--; 1785 break; 1786 } 1787 phys_avail[pa_indx++] = pa; /* start */ 1788 phys_avail[pa_indx] = pa + PAGE_SIZE; /* end */ 1789 } 1790 physmem++; 1791 } 1792 } 1793 *pte = 0; 1794 invltlb(); 1795 1796 /* 1797 * XXX 1798 * The last chunk must contain at least one page plus the message 1799 * buffer to avoid complicating other code (message buffer address 1800 * calculation, etc.). 1801 */ 1802 while (phys_avail[pa_indx - 1] + PAGE_SIZE + 1803 round_page(MSGBUF_SIZE) >= phys_avail[pa_indx]) { 1804 physmem -= atop(phys_avail[pa_indx] - phys_avail[pa_indx - 1]); 1805 phys_avail[pa_indx--] = 0; 1806 phys_avail[pa_indx--] = 0; 1807 } 1808 1809 Maxmem = atop(phys_avail[pa_indx]); 1810 1811 /* Trim off space for the message buffer. */ 1812 phys_avail[pa_indx] -= round_page(MSGBUF_SIZE); 1813 1814 avail_end = phys_avail[pa_indx]; 1815} 1816 1817void 1818init386(first) 1819 int first; 1820{ 1821 int x; 1822 struct gate_descriptor *gdp; 1823 int gsel_tss; 1824#ifndef SMP 1825 /* table descriptors - used to load tables by microp */ 1826 struct region_descriptor r_gdt, r_idt; 1827#endif 1828 int off; 1829 1830 proc0.p_addr = proc0paddr; 1831 1832 atdevbase = ISA_HOLE_START + KERNBASE; 1833 1834 if (bootinfo.bi_modulep) { 1835 preload_metadata = (caddr_t)bootinfo.bi_modulep + KERNBASE; 1836 preload_bootstrap_relocate(KERNBASE); 1837 } else { 1838 printf("WARNING: loader(8) metadata is missing!\n"); 1839 } 1840 if (bootinfo.bi_envp) 1841 kern_envp = (caddr_t)bootinfo.bi_envp + KERNBASE; 1842 1843 /* 1844 * make gdt memory segments, the code segment goes up to end of the 1845 * page with etext in it, the data segment goes to the end of 1846 * the address space 1847 */ 1848 /* 1849 * XXX text protection is temporarily (?) disabled. The limit was 1850 * i386_btop(round_page(etext)) - 1. 1851 */ 1852 gdt_segs[GCODE_SEL].ssd_limit = i386_btop(0) - 1; 1853 gdt_segs[GDATA_SEL].ssd_limit = i386_btop(0) - 1; 1854#ifdef SMP 1855 gdt_segs[GPRIV_SEL].ssd_limit = 1856 i386_btop(sizeof(struct privatespace)) - 1; 1857 gdt_segs[GPRIV_SEL].ssd_base = (int) &SMP_prvspace[0]; 1858 gdt_segs[GPROC0_SEL].ssd_base = 1859 (int) &SMP_prvspace[0].globaldata.gd_common_tss; 1860 SMP_prvspace[0].globaldata.gd_prvspace = &SMP_prvspace[0]; 1861#else 1862 gdt_segs[GPRIV_SEL].ssd_limit = i386_btop(0) - 1; 1863 gdt_segs[GPROC0_SEL].ssd_base = (int) &common_tss; 1864#endif 1865 1866 for (x = 0; x < NGDT; x++) { 1867#ifdef BDE_DEBUGGER 1868 /* avoid overwriting db entries with APM ones */ 1869 if (x >= GAPMCODE32_SEL && x <= GAPMDATA_SEL) 1870 continue; 1871#endif 1872 ssdtosd(&gdt_segs[x], &gdt[x].sd); 1873 } 1874 1875 r_gdt.rd_limit = NGDT * sizeof(gdt[0]) - 1; 1876 r_gdt.rd_base = (int) gdt; 1877 lgdt(&r_gdt); 1878 1879 /* setup curproc so that mutexes work */ 1880 PCPU_SET(curproc, &proc0); 1881 1882 /* make ldt memory segments */ 1883 /* 1884 * The data segment limit must not cover the user area because we 1885 * don't want the user area to be writable in copyout() etc. (page 1886 * level protection is lost in kernel mode on 386's). Also, we 1887 * don't want the user area to be writable directly (page level 1888 * protection of the user area is not available on 486's with 1889 * CR0_WP set, because there is no user-read/kernel-write mode). 1890 * 1891 * XXX - VM_MAXUSER_ADDRESS is an end address, not a max. And it 1892 * should be spelled ...MAX_USER... 1893 */ 1894#define VM_END_USER_RW_ADDRESS VM_MAXUSER_ADDRESS 1895 /* 1896 * The code segment limit has to cover the user area until we move 1897 * the signal trampoline out of the user area. This is safe because 1898 * the code segment cannot be written to directly. 1899 */ 1900#define VM_END_USER_R_ADDRESS (VM_END_USER_RW_ADDRESS + UPAGES * PAGE_SIZE) 1901 ldt_segs[LUCODE_SEL].ssd_limit = i386_btop(VM_END_USER_R_ADDRESS) - 1; 1902 ldt_segs[LUDATA_SEL].ssd_limit = i386_btop(VM_END_USER_RW_ADDRESS) - 1; 1903 for (x = 0; x < sizeof ldt_segs / sizeof ldt_segs[0]; x++) 1904 ssdtosd(&ldt_segs[x], &ldt[x].sd); 1905 1906 _default_ldt = GSEL(GLDT_SEL, SEL_KPL); 1907 lldt(_default_ldt); 1908#ifdef USER_LDT 1909 PCPU_SET(currentldt, _default_ldt); 1910#endif 1911 1912 /* exceptions */ 1913 for (x = 0; x < NIDT; x++) 1914 setidt(x, &IDTVEC(rsvd), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1915 setidt(0, &IDTVEC(div), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1916 setidt(1, &IDTVEC(dbg), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1917 setidt(2, &IDTVEC(nmi), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1918 setidt(3, &IDTVEC(bpt), SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL)); 1919 setidt(4, &IDTVEC(ofl), SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL)); 1920 setidt(5, &IDTVEC(bnd), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1921 setidt(6, &IDTVEC(ill), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1922 setidt(7, &IDTVEC(dna), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1923 setidt(8, 0, SDT_SYSTASKGT, SEL_KPL, GSEL(GPANIC_SEL, SEL_KPL)); 1924 setidt(9, &IDTVEC(fpusegm), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1925 setidt(10, &IDTVEC(tss), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1926 setidt(11, &IDTVEC(missing), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1927 setidt(12, &IDTVEC(stk), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1928 setidt(13, &IDTVEC(prot), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1929 setidt(14, &IDTVEC(page), SDT_SYS386IGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1930 setidt(15, &IDTVEC(rsvd), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1931 setidt(16, &IDTVEC(fpu), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1932 setidt(17, &IDTVEC(align), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1933 setidt(18, &IDTVEC(mchk), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1934 setidt(0x80, &IDTVEC(int0x80_syscall), 1935 SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL)); 1936 1937 r_idt.rd_limit = sizeof(idt0) - 1; 1938 r_idt.rd_base = (int) idt; 1939 lidt(&r_idt); 1940 1941 /* 1942 * We need this mutex before the console probe. 1943 */ 1944 mtx_init(&clock_lock, "clk interrupt lock", MTX_SPIN); 1945 1946 /* 1947 * Initialize the console before we print anything out. 1948 */ 1949 cninit(); 1950 1951#include "isa.h" 1952#if NISA >0 1953 isa_defaultirq(); 1954#endif 1955 1956 /* 1957 * Giant is used early for at least debugger traps and unexpected traps. 1958 */ 1959 mtx_init(&Giant, "Giant", MTX_DEF); 1960 1961#ifdef DDB 1962 kdb_init(); 1963 if (boothowto & RB_KDB) 1964 Debugger("Boot flags requested debugger"); 1965#endif 1966 1967 finishidentcpu(); /* Final stage of CPU initialization */ 1968 setidt(6, &IDTVEC(ill), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1969 setidt(13, &IDTVEC(prot), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1970 initializecpu(); /* Initialize CPU registers */ 1971 1972 /* make an initial tss so cpu can get interrupt stack on syscall! */ 1973 common_tss.tss_esp0 = (int) proc0.p_addr + UPAGES*PAGE_SIZE - 16; 1974 common_tss.tss_ss0 = GSEL(GDATA_SEL, SEL_KPL); 1975 gsel_tss = GSEL(GPROC0_SEL, SEL_KPL); 1976 private_tss = 0; 1977 tss_gdt = &gdt[GPROC0_SEL].sd; 1978 common_tssd = *tss_gdt; 1979 common_tss.tss_ioopt = (sizeof common_tss) << 16; 1980 ltr(gsel_tss); 1981 1982 dblfault_tss.tss_esp = dblfault_tss.tss_esp0 = dblfault_tss.tss_esp1 = 1983 dblfault_tss.tss_esp2 = (int) &dblfault_stack[sizeof(dblfault_stack)]; 1984 dblfault_tss.tss_ss = dblfault_tss.tss_ss0 = dblfault_tss.tss_ss1 = 1985 dblfault_tss.tss_ss2 = GSEL(GDATA_SEL, SEL_KPL); 1986 dblfault_tss.tss_cr3 = (int)IdlePTD; 1987 dblfault_tss.tss_eip = (int) dblfault_handler; 1988 dblfault_tss.tss_eflags = PSL_KERNEL; 1989 dblfault_tss.tss_ds = dblfault_tss.tss_es = 1990 dblfault_tss.tss_gs = GSEL(GDATA_SEL, SEL_KPL); 1991 dblfault_tss.tss_fs = GSEL(GPRIV_SEL, SEL_KPL); 1992 dblfault_tss.tss_cs = GSEL(GCODE_SEL, SEL_KPL); 1993 dblfault_tss.tss_ldt = GSEL(GLDT_SEL, SEL_KPL); 1994 1995 vm86_initialize(); 1996 getmemsize(first); 1997 1998 /* now running on new page tables, configured,and u/iom is accessible */ 1999 2000 /* Map the message buffer. */ 2001 for (off = 0; off < round_page(MSGBUF_SIZE); off += PAGE_SIZE) 2002 pmap_kenter((vm_offset_t)msgbufp + off, avail_end + off); 2003 2004 msgbufinit(msgbufp, MSGBUF_SIZE); 2005 2006 /* make a call gate to reenter kernel with */ 2007 gdp = &ldt[LSYS5CALLS_SEL].gd; 2008 2009 x = (int) &IDTVEC(syscall); 2010 gdp->gd_looffset = x++; 2011 gdp->gd_selector = GSEL(GCODE_SEL,SEL_KPL); 2012 gdp->gd_stkcpy = 1; 2013 gdp->gd_type = SDT_SYS386CGT; 2014 gdp->gd_dpl = SEL_UPL; 2015 gdp->gd_p = 1; 2016 gdp->gd_hioffset = ((int) &IDTVEC(syscall)) >>16; 2017 2018 /* XXX does this work? */ 2019 ldt[LBSDICALLS_SEL] = ldt[LSYS5CALLS_SEL]; 2020 ldt[LSOL26CALLS_SEL] = ldt[LSYS5CALLS_SEL]; 2021 2022 /* transfer to user mode */ 2023 2024 _ucodesel = LSEL(LUCODE_SEL, SEL_UPL); 2025 _udatasel = LSEL(LUDATA_SEL, SEL_UPL); 2026 2027 /* setup proc 0's pcb */ 2028 proc0.p_addr->u_pcb.pcb_flags = 0; 2029 proc0.p_addr->u_pcb.pcb_cr3 = (int)IdlePTD; 2030 proc0.p_addr->u_pcb.pcb_schednest = 0; 2031 proc0.p_addr->u_pcb.pcb_ext = 0; 2032 proc0.p_md.md_regs = &proc0_tf; 2033} 2034 2035#if defined(I586_CPU) && !defined(NO_F00F_HACK) 2036static void f00f_hack(void *unused); 2037SYSINIT(f00f_hack, SI_SUB_INTRINSIC, SI_ORDER_FIRST, f00f_hack, NULL); 2038 2039static void 2040f00f_hack(void *unused) { 2041 struct gate_descriptor *new_idt; 2042#ifndef SMP 2043 struct region_descriptor r_idt; 2044#endif 2045 vm_offset_t tmp; 2046 2047 if (!has_f00f_bug) 2048 return; 2049 2050 printf("Intel Pentium detected, installing workaround for F00F bug\n"); 2051 2052 r_idt.rd_limit = sizeof(idt0) - 1; 2053 2054 tmp = kmem_alloc(kernel_map, PAGE_SIZE * 2); 2055 if (tmp == 0) 2056 panic("kmem_alloc returned 0"); 2057 if (((unsigned int)tmp & (PAGE_SIZE-1)) != 0) 2058 panic("kmem_alloc returned non-page-aligned memory"); 2059 /* Put the first seven entries in the lower page */ 2060 new_idt = (struct gate_descriptor*)(tmp + PAGE_SIZE - (7*8)); 2061 bcopy(idt, new_idt, sizeof(idt0)); 2062 r_idt.rd_base = (int)new_idt; 2063 lidt(&r_idt); 2064 idt = new_idt; 2065 if (vm_map_protect(kernel_map, tmp, tmp + PAGE_SIZE, 2066 VM_PROT_READ, FALSE) != KERN_SUCCESS) 2067 panic("vm_map_protect failed"); 2068 return; 2069} 2070#endif /* defined(I586_CPU) && !NO_F00F_HACK */ 2071 2072int 2073ptrace_set_pc(p, addr) 2074 struct proc *p; 2075 unsigned long addr; 2076{ 2077 p->p_md.md_regs->tf_eip = addr; 2078 return (0); 2079} 2080 2081int 2082ptrace_single_step(p) 2083 struct proc *p; 2084{ 2085 p->p_md.md_regs->tf_eflags |= PSL_T; 2086 return (0); 2087} 2088 2089int ptrace_read_u_check(p, addr, len) 2090 struct proc *p; 2091 vm_offset_t addr; 2092 size_t len; 2093{ 2094 vm_offset_t gap; 2095 2096 if ((vm_offset_t) (addr + len) < addr) 2097 return EPERM; 2098 if ((vm_offset_t) (addr + len) <= sizeof(struct user)) 2099 return 0; 2100 2101 gap = (char *) p->p_md.md_regs - (char *) p->p_addr; 2102 2103 if ((vm_offset_t) addr < gap) 2104 return EPERM; 2105 if ((vm_offset_t) (addr + len) <= 2106 (vm_offset_t) (gap + sizeof(struct trapframe))) 2107 return 0; 2108 return EPERM; 2109} 2110 2111int ptrace_write_u(p, off, data) 2112 struct proc *p; 2113 vm_offset_t off; 2114 long data; 2115{ 2116 struct trapframe frame_copy; 2117 vm_offset_t min; 2118 struct trapframe *tp; 2119 2120 /* 2121 * Privileged kernel state is scattered all over the user area. 2122 * Only allow write access to parts of regs and to fpregs. 2123 */ 2124 min = (char *)p->p_md.md_regs - (char *)p->p_addr; 2125 if (off >= min && off <= min + sizeof(struct trapframe) - sizeof(int)) { 2126 tp = p->p_md.md_regs; 2127 frame_copy = *tp; 2128 *(int *)((char *)&frame_copy + (off - min)) = data; 2129 if (!EFL_SECURE(frame_copy.tf_eflags, tp->tf_eflags) || 2130 !CS_SECURE(frame_copy.tf_cs)) 2131 return (EINVAL); 2132 *(int*)((char *)p->p_addr + off) = data; 2133 return (0); 2134 } 2135 min = offsetof(struct user, u_pcb) + offsetof(struct pcb, pcb_savefpu); 2136 if (off >= min && off <= min + sizeof(struct save87) - sizeof(int)) { 2137 *(int*)((char *)p->p_addr + off) = data; 2138 return (0); 2139 } 2140 return (EFAULT); 2141} 2142 2143int 2144fill_regs(p, regs) 2145 struct proc *p; 2146 struct reg *regs; 2147{ 2148 struct pcb *pcb; 2149 struct trapframe *tp; 2150 2151 tp = p->p_md.md_regs; 2152 regs->r_fs = tp->tf_fs; 2153 regs->r_es = tp->tf_es; 2154 regs->r_ds = tp->tf_ds; 2155 regs->r_edi = tp->tf_edi; 2156 regs->r_esi = tp->tf_esi; 2157 regs->r_ebp = tp->tf_ebp; 2158 regs->r_ebx = tp->tf_ebx; 2159 regs->r_edx = tp->tf_edx; 2160 regs->r_ecx = tp->tf_ecx; 2161 regs->r_eax = tp->tf_eax; 2162 regs->r_eip = tp->tf_eip; 2163 regs->r_cs = tp->tf_cs; 2164 regs->r_eflags = tp->tf_eflags; 2165 regs->r_esp = tp->tf_esp; 2166 regs->r_ss = tp->tf_ss; 2167 pcb = &p->p_addr->u_pcb; 2168 regs->r_gs = pcb->pcb_gs; 2169 return (0); 2170} 2171 2172int 2173set_regs(p, regs) 2174 struct proc *p; 2175 struct reg *regs; 2176{ 2177 struct pcb *pcb; 2178 struct trapframe *tp; 2179 2180 tp = p->p_md.md_regs; 2181 if (!EFL_SECURE(regs->r_eflags, tp->tf_eflags) || 2182 !CS_SECURE(regs->r_cs)) 2183 return (EINVAL); 2184 tp->tf_fs = regs->r_fs; 2185 tp->tf_es = regs->r_es; 2186 tp->tf_ds = regs->r_ds; 2187 tp->tf_edi = regs->r_edi; 2188 tp->tf_esi = regs->r_esi; 2189 tp->tf_ebp = regs->r_ebp; 2190 tp->tf_ebx = regs->r_ebx; 2191 tp->tf_edx = regs->r_edx; 2192 tp->tf_ecx = regs->r_ecx; 2193 tp->tf_eax = regs->r_eax; 2194 tp->tf_eip = regs->r_eip; 2195 tp->tf_cs = regs->r_cs; 2196 tp->tf_eflags = regs->r_eflags; 2197 tp->tf_esp = regs->r_esp; 2198 tp->tf_ss = regs->r_ss; 2199 pcb = &p->p_addr->u_pcb; 2200 pcb->pcb_gs = regs->r_gs; 2201 return (0); 2202} 2203 2204int 2205fill_fpregs(p, fpregs) 2206 struct proc *p; 2207 struct fpreg *fpregs; 2208{ 2209 bcopy(&p->p_addr->u_pcb.pcb_savefpu, fpregs, sizeof *fpregs); 2210 return (0); 2211} 2212 2213int 2214set_fpregs(p, fpregs) 2215 struct proc *p; 2216 struct fpreg *fpregs; 2217{ 2218 bcopy(fpregs, &p->p_addr->u_pcb.pcb_savefpu, sizeof *fpregs); 2219 return (0); 2220} 2221 2222int 2223fill_dbregs(p, dbregs) 2224 struct proc *p; 2225 struct dbreg *dbregs; 2226{ 2227 struct pcb *pcb; 2228 2229 pcb = &p->p_addr->u_pcb; 2230 dbregs->dr0 = pcb->pcb_dr0; 2231 dbregs->dr1 = pcb->pcb_dr1; 2232 dbregs->dr2 = pcb->pcb_dr2; 2233 dbregs->dr3 = pcb->pcb_dr3; 2234 dbregs->dr4 = 0; 2235 dbregs->dr5 = 0; 2236 dbregs->dr6 = pcb->pcb_dr6; 2237 dbregs->dr7 = pcb->pcb_dr7; 2238 return (0); 2239} 2240 2241int 2242set_dbregs(p, dbregs) 2243 struct proc *p; 2244 struct dbreg *dbregs; 2245{ 2246 struct pcb *pcb; 2247 int i; 2248 u_int32_t mask1, mask2; 2249 2250 /* 2251 * Don't let an illegal value for dr7 get set. Specifically, 2252 * check for undefined settings. Setting these bit patterns 2253 * result in undefined behaviour and can lead to an unexpected 2254 * TRCTRAP. 2255 */ 2256 for (i = 0, mask1 = 0x3<<16, mask2 = 0x2<<16; i < 8; 2257 i++, mask1 <<= 2, mask2 <<= 2) 2258 if ((dbregs->dr7 & mask1) == mask2) 2259 return (EINVAL); 2260 2261 if (dbregs->dr7 & 0x0000fc00) 2262 return (EINVAL); 2263 2264 2265 2266 pcb = &p->p_addr->u_pcb; 2267 2268 /* 2269 * Don't let a process set a breakpoint that is not within the 2270 * process's address space. If a process could do this, it 2271 * could halt the system by setting a breakpoint in the kernel 2272 * (if ddb was enabled). Thus, we need to check to make sure 2273 * that no breakpoints are being enabled for addresses outside 2274 * process's address space, unless, perhaps, we were called by 2275 * uid 0. 2276 * 2277 * XXX - what about when the watched area of the user's 2278 * address space is written into from within the kernel 2279 * ... wouldn't that still cause a breakpoint to be generated 2280 * from within kernel mode? 2281 */ 2282 2283 if (p->p_ucred->cr_uid != 0) { 2284 if (dbregs->dr7 & 0x3) { 2285 /* dr0 is enabled */ 2286 if (dbregs->dr0 >= VM_MAXUSER_ADDRESS) 2287 return (EINVAL); 2288 } 2289 2290 if (dbregs->dr7 & (0x3<<2)) { 2291 /* dr1 is enabled */ 2292 if (dbregs->dr1 >= VM_MAXUSER_ADDRESS) 2293 return (EINVAL); 2294 } 2295 2296 if (dbregs->dr7 & (0x3<<4)) { 2297 /* dr2 is enabled */ 2298 if (dbregs->dr2 >= VM_MAXUSER_ADDRESS) 2299 return (EINVAL); 2300 } 2301 2302 if (dbregs->dr7 & (0x3<<6)) { 2303 /* dr3 is enabled */ 2304 if (dbregs->dr3 >= VM_MAXUSER_ADDRESS) 2305 return (EINVAL); 2306 } 2307 } 2308 2309 pcb->pcb_dr0 = dbregs->dr0; 2310 pcb->pcb_dr1 = dbregs->dr1; 2311 pcb->pcb_dr2 = dbregs->dr2; 2312 pcb->pcb_dr3 = dbregs->dr3; 2313 pcb->pcb_dr6 = dbregs->dr6; 2314 pcb->pcb_dr7 = dbregs->dr7; 2315 2316 pcb->pcb_flags |= PCB_DBREGS; 2317 2318 return (0); 2319} 2320 2321/* 2322 * Return > 0 if a hardware breakpoint has been hit, and the 2323 * breakpoint was in user space. Return 0, otherwise. 2324 */ 2325int 2326user_dbreg_trap(void) 2327{ 2328 u_int32_t dr7, dr6; /* debug registers dr6 and dr7 */ 2329 u_int32_t bp; /* breakpoint bits extracted from dr6 */ 2330 int nbp; /* number of breakpoints that triggered */ 2331 caddr_t addr[4]; /* breakpoint addresses */ 2332 int i; 2333 2334 dr7 = rdr7(); 2335 if ((dr7 & 0x000000ff) == 0) { 2336 /* 2337 * all GE and LE bits in the dr7 register are zero, 2338 * thus the trap couldn't have been caused by the 2339 * hardware debug registers 2340 */ 2341 return 0; 2342 } 2343 2344 nbp = 0; 2345 dr6 = rdr6(); 2346 bp = dr6 & 0x0000000f; 2347 2348 if (!bp) { 2349 /* 2350 * None of the breakpoint bits are set meaning this 2351 * trap was not caused by any of the debug registers 2352 */ 2353 return 0; 2354 } 2355 2356 /* 2357 * at least one of the breakpoints were hit, check to see 2358 * which ones and if any of them are user space addresses 2359 */ 2360 2361 if (bp & 0x01) { 2362 addr[nbp++] = (caddr_t)rdr0(); 2363 } 2364 if (bp & 0x02) { 2365 addr[nbp++] = (caddr_t)rdr1(); 2366 } 2367 if (bp & 0x04) { 2368 addr[nbp++] = (caddr_t)rdr2(); 2369 } 2370 if (bp & 0x08) { 2371 addr[nbp++] = (caddr_t)rdr3(); 2372 } 2373 2374 for (i=0; i<nbp; i++) { 2375 if (addr[i] < 2376 (caddr_t)VM_MAXUSER_ADDRESS) { 2377 /* 2378 * addr[i] is in user space 2379 */ 2380 return nbp; 2381 } 2382 } 2383 2384 /* 2385 * None of the breakpoints are in user space. 2386 */ 2387 return 0; 2388} 2389 2390 2391#ifndef DDB 2392void 2393Debugger(const char *msg) 2394{ 2395 printf("Debugger(\"%s\") called.\n", msg); 2396} 2397#endif /* no DDB */ 2398 2399#include <sys/disklabel.h> 2400 2401/* 2402 * Determine the size of the transfer, and make sure it is 2403 * within the boundaries of the partition. Adjust transfer 2404 * if needed, and signal errors or early completion. 2405 */ 2406int 2407bounds_check_with_label(struct bio *bp, struct disklabel *lp, int wlabel) 2408{ 2409 struct partition *p = lp->d_partitions + dkpart(bp->bio_dev); 2410 int labelsect = lp->d_partitions[0].p_offset; 2411 int maxsz = p->p_size, 2412 sz = (bp->bio_bcount + DEV_BSIZE - 1) >> DEV_BSHIFT; 2413 2414 /* overwriting disk label ? */ 2415 /* XXX should also protect bootstrap in first 8K */ 2416 if (bp->bio_blkno + p->p_offset <= LABELSECTOR + labelsect && 2417#if LABELSECTOR != 0 2418 bp->bio_blkno + p->p_offset + sz > LABELSECTOR + labelsect && 2419#endif 2420 (bp->bio_cmd == BIO_WRITE) && wlabel == 0) { 2421 bp->bio_error = EROFS; 2422 goto bad; 2423 } 2424 2425#if defined(DOSBBSECTOR) && defined(notyet) 2426 /* overwriting master boot record? */ 2427 if (bp->bio_blkno + p->p_offset <= DOSBBSECTOR && 2428 (bp->bio_cmd == BIO_WRITE) && wlabel == 0) { 2429 bp->bio_error = EROFS; 2430 goto bad; 2431 } 2432#endif 2433 2434 /* beyond partition? */ 2435 if (bp->bio_blkno < 0 || bp->bio_blkno + sz > maxsz) { 2436 /* if exactly at end of disk, return an EOF */ 2437 if (bp->bio_blkno == maxsz) { 2438 bp->bio_resid = bp->bio_bcount; 2439 return(0); 2440 } 2441 /* or truncate if part of it fits */ 2442 sz = maxsz - bp->bio_blkno; 2443 if (sz <= 0) { 2444 bp->bio_error = EINVAL; 2445 goto bad; 2446 } 2447 bp->bio_bcount = sz << DEV_BSHIFT; 2448 } 2449 2450 bp->bio_pblkno = bp->bio_blkno + p->p_offset; 2451 return(1); 2452 2453bad: 2454 bp->bio_flags |= BIO_ERROR; 2455 return(-1); 2456} 2457 2458#ifdef DDB 2459 2460/* 2461 * Provide inb() and outb() as functions. They are normally only 2462 * available as macros calling inlined functions, thus cannot be 2463 * called inside DDB. 2464 * 2465 * The actual code is stolen from <machine/cpufunc.h>, and de-inlined. 2466 */ 2467 2468#undef inb 2469#undef outb 2470 2471/* silence compiler warnings */ 2472u_char inb(u_int); 2473void outb(u_int, u_char); 2474 2475u_char 2476inb(u_int port) 2477{ 2478 u_char data; 2479 /* 2480 * We use %%dx and not %1 here because i/o is done at %dx and not at 2481 * %edx, while gcc generates inferior code (movw instead of movl) 2482 * if we tell it to load (u_short) port. 2483 */ 2484 __asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port)); 2485 return (data); 2486} 2487 2488void 2489outb(u_int port, u_char data) 2490{ 2491 u_char al; 2492 /* 2493 * Use an unnecessary assignment to help gcc's register allocator. 2494 * This make a large difference for gcc-1.40 and a tiny difference 2495 * for gcc-2.6.0. For gcc-1.40, al had to be ``asm("ax")'' for 2496 * best results. gcc-2.6.0 can't handle this. 2497 */ 2498 al = data; 2499 __asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port)); 2500} 2501 2502#endif /* DDB */ 2503