2 * Copyright (c) 1992 Terrence R. Lambert.
3 * Copyright (c) 1982, 1987, 1990 The Regents of the University of California.
6 * This code is derived from software contributed to Berkeley by
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
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.
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
37 * from: @(#)machdep.c 7.4 (Berkeley) 6/3/91
44 #include "opt_atalk.h"
45 #include "opt_compat.h"
50 #include "opt_maxmem.h"
51 #include "opt_msgbuf.h"
52 #include "opt_perfmon.h"
54 #include "opt_sysvipc.h"
55 #include "opt_user_ldt.h"
56 #include "opt_userconfig.h"
58 #include <sys/param.h>
59 #include <sys/systm.h>
60 #include <sys/sysproto.h>
61 #include <sys/signalvar.h>
62 #include <sys/kernel.h>
63 #include <sys/linker.h>
64 #include <sys/malloc.h>
67 #include <sys/reboot.h>
68 #include <sys/callout.h>
70 #include <sys/msgbuf.h>
71 #include <sys/sysent.h>
72 #include <sys/sysctl.h>
73 #include <sys/vmmeter.h>
89 #include <vm/vm_param.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>
100 #include <sys/cons.h>
104 #include <net/netisr.h>
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 */
115 #include <machine/smp.h>
116 #include <machine/globaldata.h>
119 #include <machine/perfmon.h>
123 #include <i386/isa/isa_device.h>
125 #include <i386/isa/intr_machdep.h>
127 #include <machine/vm86.h>
128 #include <machine/random.h>
129 #include <sys/ptrace.h>
130 #include <machine/sigframe.h>
132 extern void init386 __P((int first));
133 extern void dblfault_handler __P((void));
135 extern void printcpuinfo(void); /* XXX header file */
136 extern void earlysetcpuclass(void); /* same header file */
137 extern void finishidentcpu(void);
138 extern void panicifcpuunsupported(void);
139 extern void initializecpu(void);
141 static void cpu_startup __P((void *));
142 SYSINIT(cpu, SI_SUB_CPU, SI_ORDER_FIRST, cpu_startup, NULL)
144 static MALLOC_DEFINE(M_MBUF, "mbuf", "mbuf");
146 int _udatasel, _ucodesel;
149 #if defined(SWTCH_OPTIM_STATS)
150 extern int swtch_optim_stats;
151 SYSCTL_INT(_debug, OID_AUTO, swtch_optim_stats,
152 CTLFLAG_RD, &swtch_optim_stats, 0, "");
153 SYSCTL_INT(_debug, OID_AUTO, tlb_flush_count,
154 CTLFLAG_RD, &tlb_flush_count, 0, "");
158 static int ispc98 = 1;
160 static int ispc98 = 0;
162 SYSCTL_INT(_machdep, OID_AUTO, ispc98, CTLFLAG_RD, &ispc98, 0, "");
168 sysctl_hw_physmem SYSCTL_HANDLER_ARGS
170 int error = sysctl_handle_int(oidp, 0, ctob(physmem), req);
174 SYSCTL_PROC(_hw, HW_PHYSMEM, physmem, CTLTYPE_INT|CTLFLAG_RD,
175 0, 0, sysctl_hw_physmem, "I", "");
178 sysctl_hw_usermem SYSCTL_HANDLER_ARGS
180 int error = sysctl_handle_int(oidp, 0,
181 ctob(physmem - cnt.v_wire_count), req);
185 SYSCTL_PROC(_hw, HW_USERMEM, usermem, CTLTYPE_INT|CTLFLAG_RD,
186 0, 0, sysctl_hw_usermem, "I", "");
189 sysctl_hw_availpages SYSCTL_HANDLER_ARGS
191 int error = sysctl_handle_int(oidp, 0,
192 i386_btop(avail_end - avail_start), req);
196 SYSCTL_PROC(_hw, OID_AUTO, availpages, CTLTYPE_INT|CTLFLAG_RD,
197 0, 0, sysctl_hw_availpages, "I", "");
200 sysctl_machdep_msgbuf SYSCTL_HANDLER_ARGS
204 /* Unwind the buffer, so that it's linear (possibly starting with
205 * some initial nulls).
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);
217 SYSCTL_PROC(_machdep, OID_AUTO, msgbuf, CTLTYPE_STRING|CTLFLAG_RD,
218 0, 0, sysctl_machdep_msgbuf, "A","Contents of kernel message buffer");
220 static int msgbuf_clear;
223 sysctl_machdep_msgbuf_clear SYSCTL_HANDLER_ARGS
226 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2,
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;
237 SYSCTL_PROC(_machdep, OID_AUTO, msgbuf_clear, CTLTYPE_INT|CTLFLAG_RW,
238 &msgbuf_clear, 0, sysctl_machdep_msgbuf_clear, "I",
239 "Clear kernel message buffer");
241 int bootverbose = 0, Maxmem = 0;
244 vm_offset_t phys_avail[10];
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)
249 static vm_offset_t buffer_sva, buffer_eva;
250 vm_offset_t clean_sva, clean_eva;
251 static vm_offset_t pager_sva, pager_eva;
253 #define offsetof(type, member) ((size_t)(&((type *)0)->member))
266 if (boothowto & RB_VERBOSE)
270 * Good {morning,afternoon,evening,night}.
276 panicifcpuunsupported();
280 printf("real memory = %u (%uK bytes)\n", ptoa(Maxmem), ptoa(Maxmem) / 1024);
282 * Display any holes after the first chunk of extended memory.
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];
291 printf("0x%08x - 0x%08x, %u bytes (%u pages)\n",
292 phys_avail[indx], phys_avail[indx + 1] - 1, size1,
298 * Calculate callout wheel size
300 for (callwheelsize = 1, callwheelbits = 0;
301 callwheelsize < ncallout;
302 callwheelsize <<= 1, ++callwheelbits)
304 callwheelmask = callwheelsize - 1;
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".
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.
323 v = (caddr_t)firstaddr;
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)))
330 valloc(callout, struct callout, ncallout);
331 valloc(callwheel, struct callout_tailq, callwheelsize);
333 valloc(shmsegs, struct shmid_ds, shminfo.shmmni);
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));
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);
351 nbuf += min((physmem - 1024) / 8, 2048);
353 nbuf += (physmem - 16384) / 20;
355 nswbuf = max(min(nbuf/4, 256), 16);
357 valloc(swbuf, struct buf, nswbuf);
358 valloc(buf, struct buf, nbuf);
362 * End of first pass, size has been calculated so allocate memory
364 if (firstaddr == 0) {
365 size = (vm_size_t)(v - firstaddr);
366 firstaddr = (int)kmem_alloc(kernel_map, round_page(size));
368 panic("startup: no room for tables");
373 * End of second pass, addresses have been assigned
375 if ((vm_size_t)(v - firstaddr) != size)
376 panic("startup: table size inconsistency");
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,
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))));
389 * Finally, allocate mbuf pool. Since mclrefcnt is an off-size
390 * we use the more space efficient malloc in place of kmem_alloc.
393 vm_offset_t mb_map_size;
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,
401 mb_map->system_map = 1;
405 * Initialize callouts
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);
414 for (i = 0; i < callwheelsize; i++) {
415 TAILQ_INIT(&callwheel[i]);
418 #if defined(USERCONFIG)
420 cninit(); /* the preferred console may have changed */
423 printf("avail memory = %u (%uK bytes)\n", ptoa(cnt.v_free_count),
424 ptoa(cnt.v_free_count) / 1024);
427 * Set up buffers, so they can be used to read disk labels.
430 vm_pager_bufferinit();
434 * OK, enough kmem_alloc/malloc state should be up, lets get on with it!
436 mp_start(); /* fire up the APs and APICs */
442 register_netisr(num, handler)
447 if (num < 0 || num >= (sizeof(netisrs)/sizeof(*netisrs)) ) {
448 printf("register_netisr: bad isr number: %d\n", num);
451 netisrs[num] = handler;
456 unregister_netisr(num)
460 if (num < 0 || num >= (sizeof(netisrs)/sizeof(*netisrs)) ) {
461 printf("unregister_netisr: bad isr number: %d\n", num);
469 * Send an interrupt to process.
471 * Stack is set up to allow sigcode stored
472 * at top to call routine, followed by kcall
473 * to sigreturn routine below. After sigreturn
474 * resets the signal mask, the stack, and the
475 * frame pointer, it returns to the user
479 osendsig(sig_t catcher, int sig, sigset_t *mask, u_long code)
481 register struct proc *p = curproc;
482 register struct trapframe *regs;
483 register struct osigframe *fp;
485 struct sigacts *psp = p->p_sigacts;
488 regs = p->p_md.md_regs;
489 oonstack = (p->p_sigstk.ss_flags & SS_ONSTACK) ? 1 : 0;
491 /* Allocate and validate space for the signal handler context. */
492 if ((p->p_flag & P_ALTSTACK) && !oonstack &&
493 SIGISMEMBER(psp->ps_sigonstack, sig)) {
494 fp = (struct osigframe *)(p->p_sigstk.ss_sp +
495 p->p_sigstk.ss_size - sizeof(struct osigframe));
496 p->p_sigstk.ss_flags |= SS_ONSTACK;
499 fp = (struct osigframe *)regs->tf_esp - 1;
502 * grow() will return FALSE if the fp will not fit inside the stack
503 * and the stack can not be grown. useracc will return FALSE
504 * if access is denied.
506 if (grow_stack(p, (int)fp) == FALSE ||
507 !useracc((caddr_t)fp, sizeof(struct osigframe), VM_PROT_WRITE)) {
509 * Process has trashed its stack; give it an illegal
510 * instruction to halt it in its tracks.
512 SIGACTION(p, SIGILL) = SIG_DFL;
513 SIGDELSET(p->p_sigignore, SIGILL);
514 SIGDELSET(p->p_sigcatch, SIGILL);
515 SIGDELSET(p->p_sigmask, SIGILL);
520 /* Translate the signal if appropriate */
521 if (p->p_sysent->sv_sigtbl) {
522 if (sig <= p->p_sysent->sv_sigsize)
523 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)];
526 /* Build the argument list for the signal handler. */
528 sf.sf_scp = (register_t)&fp->sf_siginfo.si_sc;
529 if (SIGISMEMBER(p->p_sigacts->ps_siginfo, sig)) {
530 /* Signal handler installed with SA_SIGINFO. */
531 sf.sf_arg2 = (register_t)&fp->sf_siginfo;
532 sf.sf_siginfo.si_signo = sig;
533 sf.sf_siginfo.si_code = code;
534 sf.sf_ahu.sf_action = (__osiginfohandler_t *)catcher;
537 /* Old FreeBSD-style arguments. */
539 sf.sf_addr = regs->tf_err;
540 sf.sf_ahu.sf_handler = catcher;
543 /* save scratch registers */
544 sf.sf_siginfo.si_sc.sc_eax = regs->tf_eax;
545 sf.sf_siginfo.si_sc.sc_ebx = regs->tf_ebx;
546 sf.sf_siginfo.si_sc.sc_ecx = regs->tf_ecx;
547 sf.sf_siginfo.si_sc.sc_edx = regs->tf_edx;
548 sf.sf_siginfo.si_sc.sc_esi = regs->tf_esi;
549 sf.sf_siginfo.si_sc.sc_edi = regs->tf_edi;
550 sf.sf_siginfo.si_sc.sc_cs = regs->tf_cs;
551 sf.sf_siginfo.si_sc.sc_ds = regs->tf_ds;
552 sf.sf_siginfo.si_sc.sc_ss = regs->tf_ss;
553 sf.sf_siginfo.si_sc.sc_es = regs->tf_es;
554 sf.sf_siginfo.si_sc.sc_fs = regs->tf_fs;
555 sf.sf_siginfo.si_sc.sc_gs = rgs();
556 sf.sf_siginfo.si_sc.sc_isp = regs->tf_isp;
558 /* Build the signal context to be used by sigreturn. */
559 sf.sf_siginfo.si_sc.sc_onstack = oonstack;
560 SIG2OSIG(*mask, sf.sf_siginfo.si_sc.sc_mask);
561 sf.sf_siginfo.si_sc.sc_sp = regs->tf_esp;
562 sf.sf_siginfo.si_sc.sc_fp = regs->tf_ebp;
563 sf.sf_siginfo.si_sc.sc_pc = regs->tf_eip;
564 sf.sf_siginfo.si_sc.sc_ps = regs->tf_eflags;
565 sf.sf_siginfo.si_sc.sc_trapno = regs->tf_trapno;
566 sf.sf_siginfo.si_sc.sc_err = regs->tf_err;
569 * If we're a vm86 process, we want to save the segment registers.
570 * We also change eflags to be our emulated eflags, not the actual
573 if (regs->tf_eflags & PSL_VM) {
574 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs;
575 struct vm86_kernel *vm86 = &p->p_addr->u_pcb.pcb_ext->ext_vm86;
577 sf.sf_siginfo.si_sc.sc_gs = tf->tf_vm86_gs;
578 sf.sf_siginfo.si_sc.sc_fs = tf->tf_vm86_fs;
579 sf.sf_siginfo.si_sc.sc_es = tf->tf_vm86_es;
580 sf.sf_siginfo.si_sc.sc_ds = tf->tf_vm86_ds;
582 if (vm86->vm86_has_vme == 0)
583 sf.sf_siginfo.si_sc.sc_ps =
584 (tf->tf_eflags & ~(PSL_VIF | PSL_VIP))
585 | (vm86->vm86_eflags & (PSL_VIF | PSL_VIP));
586 /* see sendsig for comment */
587 tf->tf_eflags &= ~(PSL_VM|PSL_NT|PSL_T|PSL_VIF|PSL_VIP);
590 /* Copy the sigframe out to the user's stack. */
591 if (copyout(&sf, fp, sizeof(struct osigframe)) != 0) {
593 * Something is wrong with the stack pointer.
594 * ...Kill the process.
599 regs->tf_esp = (int)fp;
600 regs->tf_eip = PS_STRINGS - szosigcode;
601 regs->tf_cs = _ucodesel;
602 regs->tf_ds = _udatasel;
603 regs->tf_es = _udatasel;
604 regs->tf_fs = _udatasel;
606 regs->tf_ss = _udatasel;
610 sendsig(catcher, sig, mask, code)
616 struct proc *p = curproc;
617 struct trapframe *regs;
618 struct sigacts *psp = p->p_sigacts;
619 struct sigframe sf, *sfp;
622 if (SIGISMEMBER(psp->ps_osigset, sig)) {
623 osendsig(catcher, sig, mask, code);
627 regs = p->p_md.md_regs;
628 oonstack = (p->p_sigstk.ss_flags & SS_ONSTACK) ? 1 : 0;
630 /* save user context */
631 bzero(&sf, sizeof(struct sigframe));
632 sf.sf_uc.uc_sigmask = *mask;
633 sf.sf_uc.uc_stack = p->p_sigstk;
634 sf.sf_uc.uc_mcontext.mc_onstack = oonstack;
635 sf.sf_uc.uc_mcontext.mc_gs = rgs();
636 bcopy(regs, &sf.sf_uc.uc_mcontext.mc_fs, sizeof(struct trapframe));
638 /* Allocate and validate space for the signal handler context. */
639 if ((p->p_flag & P_ALTSTACK) != 0 && !oonstack &&
640 SIGISMEMBER(psp->ps_sigonstack, sig)) {
641 sfp = (struct sigframe *)(p->p_sigstk.ss_sp +
642 p->p_sigstk.ss_size - sizeof(struct sigframe));
643 p->p_sigstk.ss_flags |= SS_ONSTACK;
646 sfp = (struct sigframe *)regs->tf_esp - 1;
649 * grow() will return FALSE if the sfp will not fit inside the stack
650 * and the stack can not be grown. useracc will return FALSE if
653 if (grow_stack(p, (int)sfp) == FALSE ||
654 !useracc((caddr_t)sfp, sizeof(struct sigframe), VM_PROT_WRITE)) {
656 * Process has trashed its stack; give it an illegal
657 * instruction to halt it in its tracks.
660 printf("process %d has trashed its stack\n", p->p_pid);
662 SIGACTION(p, SIGILL) = SIG_DFL;
663 SIGDELSET(p->p_sigignore, SIGILL);
664 SIGDELSET(p->p_sigcatch, SIGILL);
665 SIGDELSET(p->p_sigmask, SIGILL);
670 /* Translate the signal is appropriate */
671 if (p->p_sysent->sv_sigtbl) {
672 if (sig <= p->p_sysent->sv_sigsize)
673 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)];
676 /* Build the argument list for the signal handler. */
678 sf.sf_ucontext = (register_t)&sfp->sf_uc;
679 if (SIGISMEMBER(p->p_sigacts->ps_siginfo, sig)) {
680 /* Signal handler installed with SA_SIGINFO. */
681 sf.sf_siginfo = (register_t)&sfp->sf_si;
682 sf.sf_ahu.sf_action = (__siginfohandler_t *)catcher;
684 /* fill siginfo structure */
685 sf.sf_si.si_signo = sig;
686 sf.sf_si.si_code = code;
687 sf.sf_si.si_addr = (void*)regs->tf_err;
690 /* Old FreeBSD-style arguments. */
691 sf.sf_siginfo = code;
692 sf.sf_addr = regs->tf_err;
693 sf.sf_ahu.sf_handler = catcher;
697 * If we're a vm86 process, we want to save the segment registers.
698 * We also change eflags to be our emulated eflags, not the actual
701 if (regs->tf_eflags & PSL_VM) {
702 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs;
703 struct vm86_kernel *vm86 = &p->p_addr->u_pcb.pcb_ext->ext_vm86;
705 sf.sf_uc.uc_mcontext.mc_gs = tf->tf_vm86_gs;
706 sf.sf_uc.uc_mcontext.mc_fs = tf->tf_vm86_fs;
707 sf.sf_uc.uc_mcontext.mc_es = tf->tf_vm86_es;
708 sf.sf_uc.uc_mcontext.mc_ds = tf->tf_vm86_ds;
710 if (vm86->vm86_has_vme == 0)
711 sf.sf_uc.uc_mcontext.mc_eflags =
712 (tf->tf_eflags & ~(PSL_VIF | PSL_VIP)) |
713 (vm86->vm86_eflags & (PSL_VIF | PSL_VIP));
716 * We should never have PSL_T set when returning from vm86
717 * mode. It may be set here if we deliver a signal before
718 * getting to vm86 mode, so turn it off.
720 * Clear PSL_NT to inhibit T_TSSFLT faults on return from
721 * syscalls made by the signal handler. This just avoids
722 * wasting time for our lazy fixup of such faults. PSL_NT
723 * does nothing in vm86 mode, but vm86 programs can set it
724 * almost legitimately in probes for old cpu types.
726 tf->tf_eflags &= ~(PSL_VM|PSL_NT|PSL_T|PSL_VIF|PSL_VIP);
730 * Copy the sigframe out to the user's stack.
732 if (copyout(&sf, sfp, sizeof(struct sigframe)) != 0) {
734 * Something is wrong with the stack pointer.
735 * ...Kill the process.
740 regs->tf_esp = (int)sfp;
741 regs->tf_eip = PS_STRINGS - *(p->p_sysent->sv_szsigcode);
742 regs->tf_cs = _ucodesel;
743 regs->tf_ds = _udatasel;
744 regs->tf_es = _udatasel;
745 regs->tf_fs = _udatasel;
747 regs->tf_ss = _udatasel;
751 * System call to cleanup state after a signal
752 * has been taken. Reset signal mask and
753 * stack state from context left by sendsig (above).
754 * Return to previous pc and psl as specified by
755 * context left by sendsig. Check carefully to
756 * make sure that the user has not modified the
757 * state to gain improper privileges.
759 #define EFL_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0)
760 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL)
765 struct osigreturn_args /* {
766 struct osigcontext *sigcntxp;
769 register struct osigcontext *scp;
770 register struct trapframe *regs = p->p_md.md_regs;
775 if (!useracc((caddr_t)scp, sizeof (struct osigcontext), VM_PROT_READ))
779 if (eflags & PSL_VM) {
780 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs;
781 struct vm86_kernel *vm86;
784 * if pcb_ext == 0 or vm86_inited == 0, the user hasn't
785 * set up the vm86 area, and we can't enter vm86 mode.
787 if (p->p_addr->u_pcb.pcb_ext == 0)
789 vm86 = &p->p_addr->u_pcb.pcb_ext->ext_vm86;
790 if (vm86->vm86_inited == 0)
793 /* go back to user mode if both flags are set */
794 if ((eflags & PSL_VIP) && (eflags & PSL_VIF))
795 trapsignal(p, SIGBUS, 0);
797 if (vm86->vm86_has_vme) {
798 eflags = (tf->tf_eflags & ~VME_USERCHANGE) |
799 (eflags & VME_USERCHANGE) | PSL_VM;
801 vm86->vm86_eflags = eflags; /* save VIF, VIP */
802 eflags = (tf->tf_eflags & ~VM_USERCHANGE) | (eflags & VM_USERCHANGE) | PSL_VM;
804 tf->tf_vm86_ds = scp->sc_ds;
805 tf->tf_vm86_es = scp->sc_es;
806 tf->tf_vm86_fs = scp->sc_fs;
807 tf->tf_vm86_gs = scp->sc_gs;
808 tf->tf_ds = _udatasel;
809 tf->tf_es = _udatasel;
810 tf->tf_fs = _udatasel;
813 * Don't allow users to change privileged or reserved flags.
816 * XXX do allow users to change the privileged flag PSL_RF.
817 * The cpu sets PSL_RF in tf_eflags for faults. Debuggers
818 * should sometimes set it there too. tf_eflags is kept in
819 * the signal context during signal handling and there is no
820 * other place to remember it, so the PSL_RF bit may be
821 * corrupted by the signal handler without us knowing.
822 * Corruption of the PSL_RF bit at worst causes one more or
823 * one less debugger trap, so allowing it is fairly harmless.
825 if (!EFL_SECURE(eflags & ~PSL_RF, regs->tf_eflags & ~PSL_RF)) {
830 * Don't allow users to load a valid privileged %cs. Let the
831 * hardware check for invalid selectors, excess privilege in
832 * other selectors, invalid %eip's and invalid %esp's.
834 if (!CS_SECURE(scp->sc_cs)) {
835 trapsignal(p, SIGBUS, T_PROTFLT);
838 regs->tf_ds = scp->sc_ds;
839 regs->tf_es = scp->sc_es;
840 regs->tf_fs = scp->sc_fs;
843 /* restore scratch registers */
844 regs->tf_eax = scp->sc_eax;
845 regs->tf_ebx = scp->sc_ebx;
846 regs->tf_ecx = scp->sc_ecx;
847 regs->tf_edx = scp->sc_edx;
848 regs->tf_esi = scp->sc_esi;
849 regs->tf_edi = scp->sc_edi;
850 regs->tf_cs = scp->sc_cs;
851 regs->tf_ss = scp->sc_ss;
852 regs->tf_isp = scp->sc_isp;
854 if (scp->sc_onstack & 01)
855 p->p_sigstk.ss_flags |= SS_ONSTACK;
857 p->p_sigstk.ss_flags &= ~SS_ONSTACK;
859 SIGSETOLD(p->p_sigmask, scp->sc_mask);
860 SIG_CANTMASK(p->p_sigmask);
861 regs->tf_ebp = scp->sc_fp;
862 regs->tf_esp = scp->sc_sp;
863 regs->tf_eip = scp->sc_pc;
864 regs->tf_eflags = eflags;
871 struct sigreturn_args /* {
872 ucontext_t *sigcntxp;
875 struct trapframe *regs;
881 if (!useracc((caddr_t)ucp, sizeof(struct osigcontext), VM_PROT_READ))
883 if (((struct osigcontext *)ucp)->sc_trapno == 0x01d516)
884 return (osigreturn(p, (struct osigreturn_args *)uap));
887 * Since ucp is not an osigcontext but a ucontext_t, we have to
888 * check again if all of it is accessible. A ucontext_t is
889 * much larger, so instead of just checking for the pointer
890 * being valid for the size of an osigcontext, now check for
891 * it being valid for a whole, new-style ucontext_t.
893 if (!useracc((caddr_t)ucp, sizeof(ucontext_t), VM_PROT_READ))
896 regs = p->p_md.md_regs;
897 eflags = ucp->uc_mcontext.mc_eflags;
899 if (eflags & PSL_VM) {
900 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs;
901 struct vm86_kernel *vm86;
904 * if pcb_ext == 0 or vm86_inited == 0, the user hasn't
905 * set up the vm86 area, and we can't enter vm86 mode.
907 if (p->p_addr->u_pcb.pcb_ext == 0)
909 vm86 = &p->p_addr->u_pcb.pcb_ext->ext_vm86;
910 if (vm86->vm86_inited == 0)
913 /* go back to user mode if both flags are set */
914 if ((eflags & PSL_VIP) && (eflags & PSL_VIF))
915 trapsignal(p, SIGBUS, 0);
917 if (vm86->vm86_has_vme) {
918 eflags = (tf->tf_eflags & ~VME_USERCHANGE) |
919 (eflags & VME_USERCHANGE) | PSL_VM;
921 vm86->vm86_eflags = eflags; /* save VIF, VIP */
922 eflags = (tf->tf_eflags & ~VM_USERCHANGE) | (eflags & VM_USERCHANGE) | PSL_VM;
924 bcopy(&ucp->uc_mcontext.mc_fs, tf, sizeof(struct trapframe));
925 tf->tf_eflags = eflags;
926 tf->tf_vm86_ds = tf->tf_ds;
927 tf->tf_vm86_es = tf->tf_es;
928 tf->tf_vm86_fs = tf->tf_fs;
929 tf->tf_vm86_gs = ucp->uc_mcontext.mc_gs;
930 tf->tf_ds = _udatasel;
931 tf->tf_es = _udatasel;
932 tf->tf_fs = _udatasel;
935 * Don't allow users to change privileged or reserved flags.
938 * XXX do allow users to change the privileged flag PSL_RF.
939 * The cpu sets PSL_RF in tf_eflags for faults. Debuggers
940 * should sometimes set it there too. tf_eflags is kept in
941 * the signal context during signal handling and there is no
942 * other place to remember it, so the PSL_RF bit may be
943 * corrupted by the signal handler without us knowing.
944 * Corruption of the PSL_RF bit at worst causes one more or
945 * one less debugger trap, so allowing it is fairly harmless.
947 if (!EFL_SECURE(eflags & ~PSL_RF, regs->tf_eflags & ~PSL_RF)) {
948 printf("sigreturn: eflags = 0x%x\n", eflags);
953 * Don't allow users to load a valid privileged %cs. Let the
954 * hardware check for invalid selectors, excess privilege in
955 * other selectors, invalid %eip's and invalid %esp's.
957 cs = ucp->uc_mcontext.mc_cs;
958 if (!CS_SECURE(cs)) {
959 printf("sigreturn: cs = 0x%x\n", cs);
960 trapsignal(p, SIGBUS, T_PROTFLT);
963 bcopy(&ucp->uc_mcontext.mc_fs, regs, sizeof(struct trapframe));
966 if (ucp->uc_mcontext.mc_onstack & 1)
967 p->p_sigstk.ss_flags |= SS_ONSTACK;
969 p->p_sigstk.ss_flags &= ~SS_ONSTACK;
971 p->p_sigmask = ucp->uc_sigmask;
972 SIG_CANTMASK(p->p_sigmask);
977 * Machine dependent boot() routine
979 * I haven't seen anything to put here yet
980 * Possibly some stuff might be grafted back here from boot()
988 * Shutdown the CPU as much as possible
998 * Clear registers on exec
1001 setregs(p, entry, stack, ps_strings)
1007 struct trapframe *regs = p->p_md.md_regs;
1008 struct pcb *pcb = &p->p_addr->u_pcb;
1011 /* was i386_user_cleanup() in NetBSD */
1015 bzero((char *)regs, sizeof(struct trapframe));
1016 regs->tf_eip = entry;
1017 regs->tf_esp = stack;
1018 regs->tf_eflags = PSL_USER | (regs->tf_eflags & PSL_T);
1019 regs->tf_ss = _udatasel;
1020 regs->tf_ds = _udatasel;
1021 regs->tf_es = _udatasel;
1022 regs->tf_fs = _udatasel;
1023 regs->tf_cs = _ucodesel;
1025 /* PS_STRINGS value for BSD/OS binaries. It is 0 for non-BSD/OS. */
1026 regs->tf_ebx = ps_strings;
1028 /* reset %gs as well */
1032 pcb->pcb_gs = _udatasel;
1035 * Initialize the math emulator (if any) for the current process.
1036 * Actually, just clear the bit that says that the emulator has
1037 * been initialized. Initialization is delayed until the process
1038 * traps to the emulator (if it is done at all) mainly because
1039 * emulators don't provide an entry point for initialization.
1041 p->p_addr->u_pcb.pcb_flags &= ~FP_SOFTFP;
1044 * Arrange to trap the next npx or `fwait' instruction (see npx.c
1045 * for why fwait must be trapped at least if there is an npx or an
1046 * emulator). This is mainly to handle the case where npx0 is not
1047 * configured, since the npx routines normally set up the trap
1048 * otherwise. It should be done only at boot time, but doing it
1049 * here allows modifying `npx_exists' for testing the emulator on
1050 * systems with an npx.
1052 load_cr0(rcr0() | CR0_MP | CR0_TS);
1055 /* Initialize the npx (if any) for the current process. */
1056 npxinit(__INITIAL_NPXCW__);
1060 * XXX - Linux emulator
1061 * Make sure sure edx is 0x0 on entry. Linux binaries depend
1068 sysctl_machdep_adjkerntz SYSCTL_HANDLER_ARGS
1071 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2,
1073 if (!error && req->newptr)
1078 SYSCTL_PROC(_machdep, CPU_ADJKERNTZ, adjkerntz, CTLTYPE_INT|CTLFLAG_RW,
1079 &adjkerntz, 0, sysctl_machdep_adjkerntz, "I", "");
1081 SYSCTL_INT(_machdep, CPU_DISRTCSET, disable_rtc_set,
1082 CTLFLAG_RW, &disable_rtc_set, 0, "");
1084 SYSCTL_STRUCT(_machdep, CPU_BOOTINFO, bootinfo,
1085 CTLFLAG_RD, &bootinfo, bootinfo, "");
1087 SYSCTL_INT(_machdep, CPU_WALLCLOCK, wall_cmos_clock,
1088 CTLFLAG_RW, &wall_cmos_clock, 0, "");
1091 * Initialize 386 and configure to run kernel
1095 * Initialize segments & interrupt table
1100 union descriptor gdt[NGDT * NCPU]; /* global descriptor table */
1102 union descriptor gdt[NGDT]; /* global descriptor table */
1104 static struct gate_descriptor idt0[NIDT];
1105 struct gate_descriptor *idt = &idt0[0]; /* interrupt descriptor table */
1106 union descriptor ldt[NLDT]; /* local descriptor table */
1108 /* table descriptors - used to load tables by microp */
1109 struct region_descriptor r_gdt, r_idt;
1113 extern struct segment_descriptor common_tssd, *tss_gdt;
1115 int private_tss; /* flag indicating private tss */
1117 #if defined(I586_CPU) && !defined(NO_F00F_HACK)
1118 extern int has_f00f_bug;
1121 static struct i386tss dblfault_tss;
1122 static char dblfault_stack[PAGE_SIZE];
1124 extern struct user *proc0paddr;
1127 /* software prototypes -- in more palatable form */
1128 struct soft_segment_descriptor gdt_segs[] = {
1129 /* GNULL_SEL 0 Null Descriptor */
1130 { 0x0, /* segment base address */
1132 0, /* segment type */
1133 0, /* segment descriptor priority level */
1134 0, /* segment descriptor present */
1136 0, /* default 32 vs 16 bit size */
1137 0 /* limit granularity (byte/page units)*/ },
1138 /* GCODE_SEL 1 Code Descriptor for kernel */
1139 { 0x0, /* segment base address */
1140 0xfffff, /* length - all address space */
1141 SDT_MEMERA, /* segment type */
1142 0, /* segment descriptor priority level */
1143 1, /* segment descriptor present */
1145 1, /* default 32 vs 16 bit size */
1146 1 /* limit granularity (byte/page units)*/ },
1147 /* GDATA_SEL 2 Data Descriptor for kernel */
1148 { 0x0, /* segment base address */
1149 0xfffff, /* length - all address space */
1150 SDT_MEMRWA, /* segment type */
1151 0, /* segment descriptor priority level */
1152 1, /* segment descriptor present */
1154 1, /* default 32 vs 16 bit size */
1155 1 /* limit granularity (byte/page units)*/ },
1156 /* GPRIV_SEL 3 SMP Per-Processor Private Data Descriptor */
1157 { 0x0, /* segment base address */
1158 0xfffff, /* length - all address space */
1159 SDT_MEMRWA, /* segment type */
1160 0, /* segment descriptor priority level */
1161 1, /* segment descriptor present */
1163 1, /* default 32 vs 16 bit size */
1164 1 /* limit granularity (byte/page units)*/ },
1165 /* GPROC0_SEL 4 Proc 0 Tss Descriptor */
1167 0x0, /* segment base address */
1168 sizeof(struct i386tss)-1,/* length - all address space */
1169 SDT_SYS386TSS, /* segment type */
1170 0, /* segment descriptor priority level */
1171 1, /* segment descriptor present */
1173 0, /* unused - default 32 vs 16 bit size */
1174 0 /* limit granularity (byte/page units)*/ },
1175 /* GLDT_SEL 5 LDT Descriptor */
1176 { (int) ldt, /* segment base address */
1177 sizeof(ldt)-1, /* length - all address space */
1178 SDT_SYSLDT, /* segment type */
1179 SEL_UPL, /* segment descriptor priority level */
1180 1, /* segment descriptor present */
1182 0, /* unused - default 32 vs 16 bit size */
1183 0 /* limit granularity (byte/page units)*/ },
1184 /* GUSERLDT_SEL 6 User LDT Descriptor per process */
1185 { (int) ldt, /* segment base address */
1186 (512 * sizeof(union descriptor)-1), /* length */
1187 SDT_SYSLDT, /* segment type */
1188 0, /* segment descriptor priority level */
1189 1, /* segment descriptor present */
1191 0, /* unused - default 32 vs 16 bit size */
1192 0 /* limit granularity (byte/page units)*/ },
1193 /* GTGATE_SEL 7 Null Descriptor - Placeholder */
1194 { 0x0, /* segment base address */
1195 0x0, /* length - all address space */
1196 0, /* segment type */
1197 0, /* segment descriptor priority level */
1198 0, /* segment descriptor present */
1200 0, /* default 32 vs 16 bit size */
1201 0 /* limit granularity (byte/page units)*/ },
1202 /* GBIOSLOWMEM_SEL 8 BIOS access to realmode segment 0x40, must be #8 in GDT */
1203 { 0x400, /* segment base address */
1204 0xfffff, /* length */
1205 SDT_MEMRWA, /* segment type */
1206 0, /* segment descriptor priority level */
1207 1, /* segment descriptor present */
1209 1, /* default 32 vs 16 bit size */
1210 1 /* limit granularity (byte/page units)*/ },
1211 /* GPANIC_SEL 9 Panic Tss Descriptor */
1212 { (int) &dblfault_tss, /* segment base address */
1213 sizeof(struct i386tss)-1,/* length - all address space */
1214 SDT_SYS386TSS, /* segment type */
1215 0, /* segment descriptor priority level */
1216 1, /* segment descriptor present */
1218 0, /* unused - default 32 vs 16 bit size */
1219 0 /* limit granularity (byte/page units)*/ },
1220 /* GBIOSCODE32_SEL 10 BIOS 32-bit interface (32bit Code) */
1221 { 0, /* segment base address (overwritten) */
1222 0xfffff, /* length */
1223 SDT_MEMERA, /* segment type */
1224 0, /* segment descriptor priority level */
1225 1, /* segment descriptor present */
1227 0, /* default 32 vs 16 bit size */
1228 1 /* limit granularity (byte/page units)*/ },
1229 /* GBIOSCODE16_SEL 11 BIOS 32-bit interface (16bit Code) */
1230 { 0, /* segment base address (overwritten) */
1231 0xfffff, /* length */
1232 SDT_MEMERA, /* segment type */
1233 0, /* segment descriptor priority level */
1234 1, /* segment descriptor present */
1236 0, /* default 32 vs 16 bit size */
1237 1 /* limit granularity (byte/page units)*/ },
1238 /* GBIOSDATA_SEL 12 BIOS 32-bit interface (Data) */
1239 { 0, /* segment base address (overwritten) */
1240 0xfffff, /* length */
1241 SDT_MEMRWA, /* segment type */
1242 0, /* segment descriptor priority level */
1243 1, /* segment descriptor present */
1245 1, /* default 32 vs 16 bit size */
1246 1 /* limit granularity (byte/page units)*/ },
1247 /* GBIOSUTIL_SEL 13 BIOS 16-bit interface (Utility) */
1248 { 0, /* segment base address (overwritten) */
1249 0xfffff, /* length */
1250 SDT_MEMRWA, /* segment type */
1251 0, /* segment descriptor priority level */
1252 1, /* segment descriptor present */
1254 0, /* default 32 vs 16 bit size */
1255 1 /* limit granularity (byte/page units)*/ },
1256 /* GBIOSARGS_SEL 14 BIOS 16-bit interface (Arguments) */
1257 { 0, /* segment base address (overwritten) */
1258 0xfffff, /* length */
1259 SDT_MEMRWA, /* segment type */
1260 0, /* segment descriptor priority level */
1261 1, /* segment descriptor present */
1263 0, /* default 32 vs 16 bit size */
1264 1 /* limit granularity (byte/page units)*/ },
1267 static struct soft_segment_descriptor ldt_segs[] = {
1268 /* Null Descriptor - overwritten by call gate */
1269 { 0x0, /* segment base address */
1270 0x0, /* length - all address space */
1271 0, /* segment type */
1272 0, /* segment descriptor priority level */
1273 0, /* segment descriptor present */
1275 0, /* default 32 vs 16 bit size */
1276 0 /* limit granularity (byte/page units)*/ },
1277 /* Null Descriptor - overwritten by call gate */
1278 { 0x0, /* segment base address */
1279 0x0, /* length - all address space */
1280 0, /* segment type */
1281 0, /* segment descriptor priority level */
1282 0, /* segment descriptor present */
1284 0, /* default 32 vs 16 bit size */
1285 0 /* limit granularity (byte/page units)*/ },
1286 /* Null Descriptor - overwritten by call gate */
1287 { 0x0, /* segment base address */
1288 0x0, /* length - all address space */
1289 0, /* segment type */
1290 0, /* segment descriptor priority level */
1291 0, /* segment descriptor present */
1293 0, /* default 32 vs 16 bit size */
1294 0 /* limit granularity (byte/page units)*/ },
1295 /* Code Descriptor for user */
1296 { 0x0, /* segment base address */
1297 0xfffff, /* length - all address space */
1298 SDT_MEMERA, /* segment type */
1299 SEL_UPL, /* segment descriptor priority level */
1300 1, /* segment descriptor present */
1302 1, /* default 32 vs 16 bit size */
1303 1 /* limit granularity (byte/page units)*/ },
1304 /* Null Descriptor - overwritten by call gate */
1305 { 0x0, /* segment base address */
1306 0x0, /* length - all address space */
1307 0, /* segment type */
1308 0, /* segment descriptor priority level */
1309 0, /* segment descriptor present */
1311 0, /* default 32 vs 16 bit size */
1312 0 /* limit granularity (byte/page units)*/ },
1313 /* Data Descriptor for user */
1314 { 0x0, /* segment base address */
1315 0xfffff, /* length - all address space */
1316 SDT_MEMRWA, /* segment type */
1317 SEL_UPL, /* segment descriptor priority level */
1318 1, /* segment descriptor present */
1320 1, /* default 32 vs 16 bit size */
1321 1 /* limit granularity (byte/page units)*/ },
1325 setidt(idx, func, typ, dpl, selec)
1332 struct gate_descriptor *ip;
1335 ip->gd_looffset = (int)func;
1336 ip->gd_selector = selec;
1342 ip->gd_hioffset = ((int)func)>>16 ;
1345 #define IDTVEC(name) __CONCAT(X,name)
1348 IDTVEC(div), IDTVEC(dbg), IDTVEC(nmi), IDTVEC(bpt), IDTVEC(ofl),
1349 IDTVEC(bnd), IDTVEC(ill), IDTVEC(dna), IDTVEC(fpusegm),
1350 IDTVEC(tss), IDTVEC(missing), IDTVEC(stk), IDTVEC(prot),
1351 IDTVEC(page), IDTVEC(mchk), IDTVEC(rsvd), IDTVEC(fpu), IDTVEC(align),
1352 IDTVEC(syscall), IDTVEC(int0x80_syscall);
1356 struct segment_descriptor *sd;
1357 struct soft_segment_descriptor *ssd;
1359 ssd->ssd_base = (sd->sd_hibase << 24) | sd->sd_lobase;
1360 ssd->ssd_limit = (sd->sd_hilimit << 16) | sd->sd_lolimit;
1361 ssd->ssd_type = sd->sd_type;
1362 ssd->ssd_dpl = sd->sd_dpl;
1363 ssd->ssd_p = sd->sd_p;
1364 ssd->ssd_def32 = sd->sd_def32;
1365 ssd->ssd_gran = sd->sd_gran;
1368 #define PHYSMAP_SIZE (2 * 8)
1371 * Populate the (physmap) array with base/bound pairs describing the
1372 * available physical memory in the system, then test this memory and
1373 * build the phys_avail array describing the actually-available memory.
1375 * If we cannot accurately determine the physical memory map, then use
1376 * value from the 0xE801 call, and failing that, the RTC.
1378 * Total memory size may be set by the kernel environment variable
1379 * hw.physmem or the compile-time define MAXMEM.
1382 getmemsize(int first)
1384 int i, physmap_idx, pa_indx;
1385 u_int basemem, extmem;
1386 struct vm86frame vmf;
1387 struct vm86context vmc;
1388 vm_offset_t pa, physmap[PHYSMAP_SIZE];
1397 bzero(&vmf, sizeof(struct vm86frame));
1398 bzero(physmap, sizeof(physmap));
1401 * Perform "base memory" related probes & setup
1403 vm86_intcall(0x12, &vmf);
1404 basemem = vmf.vmf_ax;
1405 if (basemem > 640) {
1406 printf("Preposterous BIOS basemem of %uK, truncating to 640K\n",
1412 * XXX if biosbasemem is now < 640, there is a `hole'
1413 * between the end of base memory and the start of
1414 * ISA memory. The hole may be empty or it may
1415 * contain BIOS code or data. Map it read/write so
1416 * that the BIOS can write to it. (Memory from 0 to
1417 * the physical end of the kernel is mapped read-only
1418 * to begin with and then parts of it are remapped.
1419 * The parts that aren't remapped form holes that
1420 * remain read-only and are unused by the kernel.
1421 * The base memory area is below the physical end of
1422 * the kernel and right now forms a read-only hole.
1423 * The part of it from PAGE_SIZE to
1424 * (trunc_page(biosbasemem * 1024) - 1) will be
1425 * remapped and used by the kernel later.)
1427 * This code is similar to the code used in
1428 * pmap_mapdev, but since no memory needs to be
1429 * allocated we simply change the mapping.
1431 for (pa = trunc_page(basemem * 1024);
1432 pa < ISA_HOLE_START; pa += PAGE_SIZE) {
1433 pte = (pt_entry_t)vtopte(pa + KERNBASE);
1434 *pte = pa | PG_RW | PG_V;
1438 * if basemem != 640, map pages r/w into vm86 page table so
1439 * that the bios can scribble on it.
1441 pte = (pt_entry_t)vm86paddr;
1442 for (i = basemem / 4; i < 160; i++)
1443 pte[i] = (i << PAGE_SHIFT) | PG_V | PG_RW | PG_U;
1446 * map page 1 R/W into the kernel page table so we can use it
1447 * as a buffer. The kernel will unmap this page later.
1449 pte = (pt_entry_t)vtopte(KERNBASE + (1 << PAGE_SHIFT));
1450 *pte = (1 << PAGE_SHIFT) | PG_RW | PG_V;
1453 * get memory map with INT 15:E820
1455 #define SMAPSIZ sizeof(*smap)
1456 #define SMAP_SIG 0x534D4150 /* 'SMAP' */
1459 smap = (void *)vm86_addpage(&vmc, 1, KERNBASE + (1 << PAGE_SHIFT));
1460 vm86_getptr(&vmc, (vm_offset_t)smap, &vmf.vmf_es, &vmf.vmf_di);
1465 vmf.vmf_eax = 0xE820;
1466 vmf.vmf_edx = SMAP_SIG;
1467 vmf.vmf_ecx = SMAPSIZ;
1468 i = vm86_datacall(0x15, &vmf, &vmc);
1469 if (i || vmf.vmf_eax != SMAP_SIG)
1471 if (boothowto & RB_VERBOSE)
1472 printf("SMAP type=%02x base=%08x %08x len=%08x %08x\n",
1474 *(u_int32_t *)((char *)&smap->base + 4),
1475 (u_int32_t)smap->base,
1476 *(u_int32_t *)((char *)&smap->length + 4),
1477 (u_int32_t)smap->length);
1479 if (smap->type != 0x01)
1482 if (smap->length == 0)
1485 if (smap->base >= 0xffffffff) {
1486 printf("%uK of memory above 4GB ignored\n",
1487 (u_int)(smap->length / 1024));
1491 for (i = 0; i <= physmap_idx; i += 2) {
1492 if (smap->base < physmap[i + 1]) {
1493 if (boothowto & RB_VERBOSE)
1495 "Overlapping or non-montonic memory region, ignoring second region\n");
1500 if (smap->base == physmap[physmap_idx + 1]) {
1501 physmap[physmap_idx + 1] += smap->length;
1506 if (physmap_idx == PHYSMAP_SIZE) {
1508 "Too many segments in the physical address map, giving up\n");
1511 physmap[physmap_idx] = smap->base;
1512 physmap[physmap_idx + 1] = smap->base + smap->length;
1514 } while (vmf.vmf_ebx != 0);
1516 if (physmap[1] != 0)
1520 * If we failed above, try memory map with INT 15:E801
1522 vmf.vmf_ax = 0xE801;
1523 if (vm86_intcall(0x15, &vmf) == 0) {
1524 extmem = vmf.vmf_cx + vmf.vmf_dx * 64;
1528 vm86_intcall(0x15, &vmf);
1529 extmem = vmf.vmf_ax;
1532 * Prefer the RTC value for extended memory.
1534 extmem = rtcin(RTC_EXTLO) + (rtcin(RTC_EXTHI) << 8);
1539 * Special hack for chipsets that still remap the 384k hole when
1540 * there's 16MB of memory - this really confuses people that
1541 * are trying to use bus mastering ISA controllers with the
1542 * "16MB limit"; they only have 16MB, but the remapping puts
1543 * them beyond the limit.
1545 * If extended memory is between 15-16MB (16-17MB phys address range),
1548 if ((extmem > 15 * 1024) && (extmem < 16 * 1024))
1552 physmap[1] = basemem * 1024;
1554 physmap[physmap_idx] = 0x100000;
1555 physmap[physmap_idx + 1] = physmap[physmap_idx] + extmem * 1024;
1559 * Now, physmap contains a map of physical memory.
1563 /* make hole for AP bootstrap code */
1564 physmap[1] = mp_bootaddress(physmap[1] / 1024);
1566 /* look for the MP hardware - needed for apic addresses */
1571 * Maxmem isn't the "maximum memory", it's one larger than the
1572 * highest page of the physical address space. It should be
1573 * called something like "Maxphyspage". We may adjust this
1574 * based on ``hw.physmem'' and the results of the memory test.
1576 Maxmem = atop(physmap[physmap_idx + 1]);
1579 Maxmem = MAXMEM / 4;
1583 * hw.maxmem is a size in bytes; we also allow k, m, and g suffixes
1584 * for the appropriate modifiers. This overrides MAXMEM.
1586 if ((cp = getenv("hw.physmem")) != NULL) {
1587 u_int64_t AllowMem, sanity;
1590 sanity = AllowMem = strtouq(cp, &ep, 0);
1591 if ((ep != cp) && (*ep != 0)) {
1604 AllowMem = sanity = 0;
1606 if (AllowMem < sanity)
1610 printf("Ignoring invalid memory size of '%s'\n", cp);
1612 Maxmem = atop(AllowMem);
1615 if (atop(physmap[physmap_idx + 1]) != Maxmem &&
1616 (boothowto & RB_VERBOSE))
1617 printf("Physical memory use set to %uK\n", Maxmem * 4);
1620 * If Maxmem has been increased beyond what the system has detected,
1621 * extend the last memory segment to the new limit.
1623 if (atop(physmap[physmap_idx + 1]) < Maxmem)
1624 physmap[physmap_idx + 1] = ptoa(Maxmem);
1626 /* call pmap initialization to make new kernel address space */
1627 pmap_bootstrap(first, 0);
1630 * Size up each available chunk of physical memory.
1632 physmap[0] = PAGE_SIZE; /* mask off page 0 */
1634 phys_avail[pa_indx++] = physmap[0];
1635 phys_avail[pa_indx] = physmap[0];
1637 pte = (pt_entry_t)vtopte(KERNBASE);
1639 pte = (pt_entry_t)CMAP1;
1643 * physmap is in bytes, so when converting to page boundaries,
1644 * round up the start address and round down the end address.
1646 for (i = 0; i <= physmap_idx; i += 2) {
1650 if (physmap[i + 1] < end)
1651 end = trunc_page(physmap[i + 1]);
1652 for (pa = round_page(physmap[i]); pa < end; pa += PAGE_SIZE) {
1657 int *ptr = (int *)CADDR1;
1661 * block out kernel memory as not available.
1663 if (pa >= 0x100000 && pa < first)
1669 * map page into kernel: valid, read/write,non-cacheable
1671 *pte = pa | PG_V | PG_RW | PG_N;
1676 * Test for alternating 1's and 0's
1678 *(volatile int *)ptr = 0xaaaaaaaa;
1679 if (*(volatile int *)ptr != 0xaaaaaaaa) {
1683 * Test for alternating 0's and 1's
1685 *(volatile int *)ptr = 0x55555555;
1686 if (*(volatile int *)ptr != 0x55555555) {
1692 *(volatile int *)ptr = 0xffffffff;
1693 if (*(volatile int *)ptr != 0xffffffff) {
1699 *(volatile int *)ptr = 0x0;
1700 if (*(volatile int *)ptr != 0x0) {
1704 * Restore original value.
1709 * Adjust array of valid/good pages.
1711 if (page_bad == TRUE) {
1715 * If this good page is a continuation of the
1716 * previous set of good pages, then just increase
1717 * the end pointer. Otherwise start a new chunk.
1718 * Note that "end" points one higher than end,
1719 * making the range >= start and < end.
1720 * If we're also doing a speculative memory
1721 * test and we at or past the end, bump up Maxmem
1722 * so that we keep going. The first bad page
1723 * will terminate the loop.
1725 if (phys_avail[pa_indx] == pa) {
1726 phys_avail[pa_indx] += PAGE_SIZE;
1729 if (pa_indx == PHYS_AVAIL_ARRAY_END) {
1730 printf("Too many holes in the physical address space, giving up\n");
1734 phys_avail[pa_indx++] = pa; /* start */
1735 phys_avail[pa_indx] = pa + PAGE_SIZE; /* end */
1745 * The last chunk must contain at least one page plus the message
1746 * buffer to avoid complicating other code (message buffer address
1747 * calculation, etc.).
1749 while (phys_avail[pa_indx - 1] + PAGE_SIZE +
1750 round_page(MSGBUF_SIZE) >= phys_avail[pa_indx]) {
1751 physmem -= atop(phys_avail[pa_indx] - phys_avail[pa_indx - 1]);
1752 phys_avail[pa_indx--] = 0;
1753 phys_avail[pa_indx--] = 0;
1756 Maxmem = atop(phys_avail[pa_indx]);
1758 /* Trim off space for the message buffer. */
1759 phys_avail[pa_indx] -= round_page(MSGBUF_SIZE);
1761 avail_end = phys_avail[pa_indx];
1769 struct gate_descriptor *gdp;
1772 /* table descriptors - used to load tables by microp */
1773 struct region_descriptor r_gdt, r_idt;
1778 * Prevent lowering of the ipl if we call tsleep() early.
1782 proc0.p_addr = proc0paddr;
1784 atdevbase = ISA_HOLE_START + KERNBASE;
1786 if (bootinfo.bi_modulep) {
1787 preload_metadata = (caddr_t)bootinfo.bi_modulep + KERNBASE;
1788 preload_bootstrap_relocate(KERNBASE);
1790 if (bootinfo.bi_envp)
1791 kern_envp = (caddr_t)bootinfo.bi_envp + KERNBASE;
1794 * make gdt memory segments, the code segment goes up to end of the
1795 * page with etext in it, the data segment goes to the end of
1799 * XXX text protection is temporarily (?) disabled. The limit was
1800 * i386_btop(round_page(etext)) - 1.
1802 gdt_segs[GCODE_SEL].ssd_limit = i386_btop(0) - 1;
1803 gdt_segs[GDATA_SEL].ssd_limit = i386_btop(0) - 1;
1805 gdt_segs[GPRIV_SEL].ssd_limit =
1806 i386_btop(sizeof(struct privatespace)) - 1;
1807 gdt_segs[GPRIV_SEL].ssd_base = (int) &SMP_prvspace[0];
1808 gdt_segs[GPROC0_SEL].ssd_base =
1809 (int) &SMP_prvspace[0].globaldata.gd_common_tss;
1810 SMP_prvspace[0].globaldata.gd_prvspace = &SMP_prvspace[0];
1812 gdt_segs[GPRIV_SEL].ssd_limit = i386_btop(0) - 1;
1813 gdt_segs[GPROC0_SEL].ssd_base = (int) &common_tss;
1816 for (x = 0; x < NGDT; x++) {
1818 /* avoid overwriting db entries with APM ones */
1819 if (x >= GAPMCODE32_SEL && x <= GAPMDATA_SEL)
1822 ssdtosd(&gdt_segs[x], &gdt[x].sd);
1825 r_gdt.rd_limit = NGDT * sizeof(gdt[0]) - 1;
1826 r_gdt.rd_base = (int) gdt;
1829 /* make ldt memory segments */
1831 * The data segment limit must not cover the user area because we
1832 * don't want the user area to be writable in copyout() etc. (page
1833 * level protection is lost in kernel mode on 386's). Also, we
1834 * don't want the user area to be writable directly (page level
1835 * protection of the user area is not available on 486's with
1836 * CR0_WP set, because there is no user-read/kernel-write mode).
1838 * XXX - VM_MAXUSER_ADDRESS is an end address, not a max. And it
1839 * should be spelled ...MAX_USER...
1841 #define VM_END_USER_RW_ADDRESS VM_MAXUSER_ADDRESS
1843 * The code segment limit has to cover the user area until we move
1844 * the signal trampoline out of the user area. This is safe because
1845 * the code segment cannot be written to directly.
1847 #define VM_END_USER_R_ADDRESS (VM_END_USER_RW_ADDRESS + UPAGES * PAGE_SIZE)
1848 ldt_segs[LUCODE_SEL].ssd_limit = i386_btop(VM_END_USER_R_ADDRESS) - 1;
1849 ldt_segs[LUDATA_SEL].ssd_limit = i386_btop(VM_END_USER_RW_ADDRESS) - 1;
1850 for (x = 0; x < sizeof ldt_segs / sizeof ldt_segs[0]; x++)
1851 ssdtosd(&ldt_segs[x], &ldt[x].sd);
1853 _default_ldt = GSEL(GLDT_SEL, SEL_KPL);
1856 currentldt = _default_ldt;
1860 for (x = 0; x < NIDT; x++)
1861 setidt(x, &IDTVEC(rsvd), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1862 setidt(0, &IDTVEC(div), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1863 setidt(1, &IDTVEC(dbg), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1864 setidt(2, &IDTVEC(nmi), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1865 setidt(3, &IDTVEC(bpt), SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL));
1866 setidt(4, &IDTVEC(ofl), SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL));
1867 setidt(5, &IDTVEC(bnd), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1868 setidt(6, &IDTVEC(ill), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1869 setidt(7, &IDTVEC(dna), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1870 setidt(8, 0, SDT_SYSTASKGT, SEL_KPL, GSEL(GPANIC_SEL, SEL_KPL));
1871 setidt(9, &IDTVEC(fpusegm), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1872 setidt(10, &IDTVEC(tss), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1873 setidt(11, &IDTVEC(missing), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1874 setidt(12, &IDTVEC(stk), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1875 setidt(13, &IDTVEC(prot), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1876 setidt(14, &IDTVEC(page), SDT_SYS386IGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1877 setidt(15, &IDTVEC(rsvd), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1878 setidt(16, &IDTVEC(fpu), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1879 setidt(17, &IDTVEC(align), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1880 setidt(18, &IDTVEC(mchk), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1881 setidt(0x80, &IDTVEC(int0x80_syscall),
1882 SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL));
1884 r_idt.rd_limit = sizeof(idt0) - 1;
1885 r_idt.rd_base = (int) idt;
1889 * Initialize the console before we print anything out.
1901 if (boothowto & RB_KDB)
1902 Debugger("Boot flags requested debugger");
1905 finishidentcpu(); /* Final stage of CPU initialization */
1906 setidt(6, &IDTVEC(ill), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1907 setidt(13, &IDTVEC(prot), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1908 initializecpu(); /* Initialize CPU registers */
1910 /* make an initial tss so cpu can get interrupt stack on syscall! */
1911 common_tss.tss_esp0 = (int) proc0.p_addr + UPAGES*PAGE_SIZE - 16;
1912 common_tss.tss_ss0 = GSEL(GDATA_SEL, SEL_KPL) ;
1913 gsel_tss = GSEL(GPROC0_SEL, SEL_KPL);
1915 tss_gdt = &gdt[GPROC0_SEL].sd;
1916 common_tssd = *tss_gdt;
1917 common_tss.tss_ioopt = (sizeof common_tss) << 16;
1920 dblfault_tss.tss_esp = dblfault_tss.tss_esp0 = dblfault_tss.tss_esp1 =
1921 dblfault_tss.tss_esp2 = (int) &dblfault_stack[sizeof(dblfault_stack)];
1922 dblfault_tss.tss_ss = dblfault_tss.tss_ss0 = dblfault_tss.tss_ss1 =
1923 dblfault_tss.tss_ss2 = GSEL(GDATA_SEL, SEL_KPL);
1924 dblfault_tss.tss_cr3 = (int)IdlePTD;
1925 dblfault_tss.tss_eip = (int) dblfault_handler;
1926 dblfault_tss.tss_eflags = PSL_KERNEL;
1927 dblfault_tss.tss_ds = dblfault_tss.tss_es =
1928 dblfault_tss.tss_gs = GSEL(GDATA_SEL, SEL_KPL);
1929 dblfault_tss.tss_fs = GSEL(GPRIV_SEL, SEL_KPL);
1930 dblfault_tss.tss_cs = GSEL(GCODE_SEL, SEL_KPL);
1931 dblfault_tss.tss_ldt = GSEL(GLDT_SEL, SEL_KPL);
1936 /* now running on new page tables, configured,and u/iom is accessible */
1938 /* Map the message buffer. */
1939 for (off = 0; off < round_page(MSGBUF_SIZE); off += PAGE_SIZE)
1940 pmap_kenter((vm_offset_t)msgbufp + off, avail_end + off);
1942 msgbufinit(msgbufp, MSGBUF_SIZE);
1944 /* make a call gate to reenter kernel with */
1945 gdp = &ldt[LSYS5CALLS_SEL].gd;
1947 x = (int) &IDTVEC(syscall);
1948 gdp->gd_looffset = x++;
1949 gdp->gd_selector = GSEL(GCODE_SEL,SEL_KPL);
1951 gdp->gd_type = SDT_SYS386CGT;
1952 gdp->gd_dpl = SEL_UPL;
1954 gdp->gd_hioffset = ((int) &IDTVEC(syscall)) >>16;
1956 /* XXX does this work? */
1957 ldt[LBSDICALLS_SEL] = ldt[LSYS5CALLS_SEL];
1958 ldt[LSOL26CALLS_SEL] = ldt[LSYS5CALLS_SEL];
1960 /* transfer to user mode */
1962 _ucodesel = LSEL(LUCODE_SEL, SEL_UPL);
1963 _udatasel = LSEL(LUDATA_SEL, SEL_UPL);
1965 /* setup proc 0's pcb */
1966 proc0.p_addr->u_pcb.pcb_flags = 0;
1967 proc0.p_addr->u_pcb.pcb_cr3 = (int)IdlePTD;
1969 proc0.p_addr->u_pcb.pcb_mpnest = 1;
1971 proc0.p_addr->u_pcb.pcb_ext = 0;
1974 #if defined(I586_CPU) && !defined(NO_F00F_HACK)
1975 static void f00f_hack(void *unused);
1976 SYSINIT(f00f_hack, SI_SUB_INTRINSIC, SI_ORDER_FIRST, f00f_hack, NULL);
1979 f00f_hack(void *unused) {
1980 struct gate_descriptor *new_idt;
1982 struct region_descriptor r_idt;
1989 printf("Intel Pentium detected, installing workaround for F00F bug\n");
1991 r_idt.rd_limit = sizeof(idt0) - 1;
1993 tmp = kmem_alloc(kernel_map, PAGE_SIZE * 2);
1995 panic("kmem_alloc returned 0");
1996 if (((unsigned int)tmp & (PAGE_SIZE-1)) != 0)
1997 panic("kmem_alloc returned non-page-aligned memory");
1998 /* Put the first seven entries in the lower page */
1999 new_idt = (struct gate_descriptor*)(tmp + PAGE_SIZE - (7*8));
2000 bcopy(idt, new_idt, sizeof(idt0));
2001 r_idt.rd_base = (int)new_idt;
2004 if (vm_map_protect(kernel_map, tmp, tmp + PAGE_SIZE,
2005 VM_PROT_READ, FALSE) != KERN_SUCCESS)
2006 panic("vm_map_protect failed");
2009 #endif /* defined(I586_CPU) && !NO_F00F_HACK */
2012 ptrace_set_pc(p, addr)
2016 p->p_md.md_regs->tf_eip = addr;
2021 ptrace_single_step(p)
2024 p->p_md.md_regs->tf_eflags |= PSL_T;
2028 int ptrace_read_u_check(p, addr, len)
2035 if ((vm_offset_t) (addr + len) < addr)
2037 if ((vm_offset_t) (addr + len) <= sizeof(struct user))
2040 gap = (char *) p->p_md.md_regs - (char *) p->p_addr;
2042 if ((vm_offset_t) addr < gap)
2044 if ((vm_offset_t) (addr + len) <=
2045 (vm_offset_t) (gap + sizeof(struct trapframe)))
2050 int ptrace_write_u(p, off, data)
2055 struct trapframe frame_copy;
2057 struct trapframe *tp;
2060 * Privileged kernel state is scattered all over the user area.
2061 * Only allow write access to parts of regs and to fpregs.
2063 min = (char *)p->p_md.md_regs - (char *)p->p_addr;
2064 if (off >= min && off <= min + sizeof(struct trapframe) - sizeof(int)) {
2065 tp = p->p_md.md_regs;
2067 *(int *)((char *)&frame_copy + (off - min)) = data;
2068 if (!EFL_SECURE(frame_copy.tf_eflags, tp->tf_eflags) ||
2069 !CS_SECURE(frame_copy.tf_cs))
2071 *(int*)((char *)p->p_addr + off) = data;
2074 min = offsetof(struct user, u_pcb) + offsetof(struct pcb, pcb_savefpu);
2075 if (off >= min && off <= min + sizeof(struct save87) - sizeof(int)) {
2076 *(int*)((char *)p->p_addr + off) = data;
2088 struct trapframe *tp;
2090 tp = p->p_md.md_regs;
2091 regs->r_fs = tp->tf_fs;
2092 regs->r_es = tp->tf_es;
2093 regs->r_ds = tp->tf_ds;
2094 regs->r_edi = tp->tf_edi;
2095 regs->r_esi = tp->tf_esi;
2096 regs->r_ebp = tp->tf_ebp;
2097 regs->r_ebx = tp->tf_ebx;
2098 regs->r_edx = tp->tf_edx;
2099 regs->r_ecx = tp->tf_ecx;
2100 regs->r_eax = tp->tf_eax;
2101 regs->r_eip = tp->tf_eip;
2102 regs->r_cs = tp->tf_cs;
2103 regs->r_eflags = tp->tf_eflags;
2104 regs->r_esp = tp->tf_esp;
2105 regs->r_ss = tp->tf_ss;
2106 pcb = &p->p_addr->u_pcb;
2107 regs->r_gs = pcb->pcb_gs;
2117 struct trapframe *tp;
2119 tp = p->p_md.md_regs;
2120 if (!EFL_SECURE(regs->r_eflags, tp->tf_eflags) ||
2121 !CS_SECURE(regs->r_cs))
2123 tp->tf_fs = regs->r_fs;
2124 tp->tf_es = regs->r_es;
2125 tp->tf_ds = regs->r_ds;
2126 tp->tf_edi = regs->r_edi;
2127 tp->tf_esi = regs->r_esi;
2128 tp->tf_ebp = regs->r_ebp;
2129 tp->tf_ebx = regs->r_ebx;
2130 tp->tf_edx = regs->r_edx;
2131 tp->tf_ecx = regs->r_ecx;
2132 tp->tf_eax = regs->r_eax;
2133 tp->tf_eip = regs->r_eip;
2134 tp->tf_cs = regs->r_cs;
2135 tp->tf_eflags = regs->r_eflags;
2136 tp->tf_esp = regs->r_esp;
2137 tp->tf_ss = regs->r_ss;
2138 pcb = &p->p_addr->u_pcb;
2139 pcb->pcb_gs = regs->r_gs;
2144 fill_fpregs(p, fpregs)
2146 struct fpreg *fpregs;
2148 bcopy(&p->p_addr->u_pcb.pcb_savefpu, fpregs, sizeof *fpregs);
2153 set_fpregs(p, fpregs)
2155 struct fpreg *fpregs;
2157 bcopy(fpregs, &p->p_addr->u_pcb.pcb_savefpu, sizeof *fpregs);
2162 fill_dbregs(p, dbregs)
2164 struct dbreg *dbregs;
2168 pcb = &p->p_addr->u_pcb;
2169 dbregs->dr0 = pcb->pcb_dr0;
2170 dbregs->dr1 = pcb->pcb_dr1;
2171 dbregs->dr2 = pcb->pcb_dr2;
2172 dbregs->dr3 = pcb->pcb_dr3;
2175 dbregs->dr6 = pcb->pcb_dr6;
2176 dbregs->dr7 = pcb->pcb_dr7;
2181 set_dbregs(p, dbregs)
2183 struct dbreg *dbregs;
2187 pcb = &p->p_addr->u_pcb;
2190 * Don't let a process set a breakpoint that is not within the
2191 * process's address space. If a process could do this, it
2192 * could halt the system by setting a breakpoint in the kernel
2193 * (if ddb was enabled). Thus, we need to check to make sure
2194 * that no breakpoints are being enabled for addresses outside
2195 * process's address space, unless, perhaps, we were called by
2198 * XXX - what about when the watched area of the user's
2199 * address space is written into from within the kernel
2200 * ... wouldn't that still cause a breakpoint to be generated
2201 * from within kernel mode?
2204 if (p->p_ucred->cr_uid != 0) {
2205 if (dbregs->dr7 & 0x3) {
2206 /* dr0 is enabled */
2207 if (dbregs->dr0 >= VM_MAXUSER_ADDRESS)
2211 if (dbregs->dr7 & (0x3<<2)) {
2212 /* dr1 is enabled */
2213 if (dbregs->dr1 >= VM_MAXUSER_ADDRESS)
2217 if (dbregs->dr7 & (0x3<<4)) {
2218 /* dr2 is enabled */
2219 if (dbregs->dr2 >= VM_MAXUSER_ADDRESS)
2223 if (dbregs->dr7 & (0x3<<6)) {
2224 /* dr3 is enabled */
2225 if (dbregs->dr3 >= VM_MAXUSER_ADDRESS)
2230 pcb->pcb_dr0 = dbregs->dr0;
2231 pcb->pcb_dr1 = dbregs->dr1;
2232 pcb->pcb_dr2 = dbregs->dr2;
2233 pcb->pcb_dr3 = dbregs->dr3;
2234 pcb->pcb_dr6 = dbregs->dr6;
2235 pcb->pcb_dr7 = dbregs->dr7;
2237 pcb->pcb_flags |= PCB_DBREGS;
2243 * Return > 0 if a hardware breakpoint has been hit, and the
2244 * breakpoint was in user space. Return 0, otherwise.
2247 user_dbreg_trap(void)
2249 u_int32_t dr7, dr6; /* debug registers dr6 and dr7 */
2250 u_int32_t bp; /* breakpoint bits extracted from dr6 */
2251 int nbp; /* number of breakpoints that triggered */
2252 caddr_t addr[4]; /* breakpoint addresses */
2256 if ((dr7 & 0x000000ff) == 0) {
2258 * all GE and LE bits in the dr7 register are zero,
2259 * thus the trap couldn't have been caused by the
2260 * hardware debug registers
2267 bp = dr6 & 0x0000000f;
2271 * None of the breakpoint bits are set meaning this
2272 * trap was not caused by any of the debug registers
2278 * at least one of the breakpoints were hit, check to see
2279 * which ones and if any of them are user space addresses
2283 addr[nbp++] = (caddr_t)rdr0();
2286 addr[nbp++] = (caddr_t)rdr1();
2289 addr[nbp++] = (caddr_t)rdr2();
2292 addr[nbp++] = (caddr_t)rdr3();
2295 for (i=0; i<nbp; i++) {
2297 (caddr_t)VM_MAXUSER_ADDRESS) {
2299 * addr[i] is in user space
2306 * None of the breakpoints are in user space.
2314 Debugger(const char *msg)
2316 printf("Debugger(\"%s\") called.\n", msg);
2320 #include <sys/disklabel.h>
2323 * Determine the size of the transfer, and make sure it is
2324 * within the boundaries of the partition. Adjust transfer
2325 * if needed, and signal errors or early completion.
2328 bounds_check_with_label(struct buf *bp, struct disklabel *lp, int wlabel)
2330 struct partition *p = lp->d_partitions + dkpart(bp->b_dev);
2331 int labelsect = lp->d_partitions[0].p_offset;
2332 int maxsz = p->p_size,
2333 sz = (bp->b_bcount + DEV_BSIZE - 1) >> DEV_BSHIFT;
2335 /* overwriting disk label ? */
2336 /* XXX should also protect bootstrap in first 8K */
2337 if (bp->b_blkno + p->p_offset <= LABELSECTOR + labelsect &&
2338 #if LABELSECTOR != 0
2339 bp->b_blkno + p->p_offset + sz > LABELSECTOR + labelsect &&
2341 (bp->b_flags & B_READ) == 0 && wlabel == 0) {
2342 bp->b_error = EROFS;
2346 #if defined(DOSBBSECTOR) && defined(notyet)
2347 /* overwriting master boot record? */
2348 if (bp->b_blkno + p->p_offset <= DOSBBSECTOR &&
2349 (bp->b_flags & B_READ) == 0 && wlabel == 0) {
2350 bp->b_error = EROFS;
2355 /* beyond partition? */
2356 if (bp->b_blkno < 0 || bp->b_blkno + sz > maxsz) {
2357 /* if exactly at end of disk, return an EOF */
2358 if (bp->b_blkno == maxsz) {
2359 bp->b_resid = bp->b_bcount;
2362 /* or truncate if part of it fits */
2363 sz = maxsz - bp->b_blkno;
2365 bp->b_error = EINVAL;
2368 bp->b_bcount = sz << DEV_BSHIFT;
2371 bp->b_pblkno = bp->b_blkno + p->p_offset;
2375 bp->b_flags |= B_ERROR;
2382 * Provide inb() and outb() as functions. They are normally only
2383 * available as macros calling inlined functions, thus cannot be
2384 * called inside DDB.
2386 * The actual code is stolen from <machine/cpufunc.h>, and de-inlined.
2392 /* silence compiler warnings */
2394 void outb(u_int, u_char);
2401 * We use %%dx and not %1 here because i/o is done at %dx and not at
2402 * %edx, while gcc generates inferior code (movw instead of movl)
2403 * if we tell it to load (u_short) port.
2405 __asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port));
2410 outb(u_int port, u_char data)
2414 * Use an unnecessary assignment to help gcc's register allocator.
2415 * This make a large difference for gcc-1.40 and a tiny difference
2416 * for gcc-2.6.0. For gcc-1.40, al had to be ``asm("ax")'' for
2417 * best results. gcc-2.6.0 can't handle this.
2420 __asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port));