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
40 #include <sys/cdefs.h>
41 __FBSDID("$FreeBSD$");
44 #include "opt_atalk.h"
45 #include "opt_compat.h"
51 #include "opt_kstack_pages.h"
52 #include "opt_maxmem.h"
53 #include "opt_msgbuf.h"
55 #include "opt_perfmon.h"
58 #include <sys/param.h>
60 #include <sys/systm.h>
64 #include <sys/callout.h>
67 #include <sys/eventhandler.h>
69 #include <sys/imgact.h>
71 #include <sys/kernel.h>
73 #include <sys/linker.h>
75 #include <sys/malloc.h>
76 #include <sys/memrange.h>
77 #include <sys/msgbuf.h>
78 #include <sys/mutex.h>
80 #include <sys/ptrace.h>
81 #include <sys/reboot.h>
82 #include <sys/sched.h>
83 #include <sys/signalvar.h>
84 #include <sys/sysctl.h>
85 #include <sys/sysent.h>
86 #include <sys/sysproto.h>
87 #include <sys/ucontext.h>
88 #include <sys/vmmeter.h>
91 #include <vm/vm_extern.h>
92 #include <vm/vm_kern.h>
93 #include <vm/vm_page.h>
94 #include <vm/vm_map.h>
95 #include <vm/vm_object.h>
96 #include <vm/vm_pager.h>
97 #include <vm/vm_param.h>
101 #error KDB must be enabled in order for DDB to work!
104 #include <ddb/db_sym.h>
109 #include <net/netisr.h>
111 #include <machine/bootinfo.h>
112 #include <machine/clock.h>
113 #include <machine/cpu.h>
114 #include <machine/cputypes.h>
115 #include <machine/intr_machdep.h>
116 #include <machine/md_var.h>
117 #include <machine/pc/bios.h>
118 #include <machine/pcb.h>
119 #include <machine/pcb_ext.h>
120 #include <machine/proc.h>
121 #include <machine/reg.h>
122 #include <machine/sigframe.h>
123 #include <machine/specialreg.h>
124 #include <machine/vm86.h>
126 #include <machine/perfmon.h>
129 #include <machine/privatespace.h>
130 #include <machine/smp.h>
134 #include <i386/isa/icu.h>
138 #include <machine/xbox.h>
140 int arch_i386_is_xbox = 0;
141 uint32_t arch_i386_xbox_memsize = 0;
144 /* Sanity check for __curthread() */
145 CTASSERT(offsetof(struct pcpu, pc_curthread) == 0);
147 extern void init386(int first);
148 extern void dblfault_handler(void);
150 extern void printcpuinfo(void); /* XXX header file */
151 extern void finishidentcpu(void);
152 extern void panicifcpuunsupported(void);
153 extern void initializecpu(void);
155 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL)
156 #define EFL_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0)
158 #if !defined(CPU_DISABLE_SSE) && defined(I686_CPU)
159 #define CPU_ENABLE_SSE
162 static void cpu_startup(void *);
163 static void fpstate_drop(struct thread *td);
164 static void get_fpcontext(struct thread *td, mcontext_t *mcp);
165 static int set_fpcontext(struct thread *td, const mcontext_t *mcp);
166 #ifdef CPU_ENABLE_SSE
167 static void set_fpregs_xmm(struct save87 *, struct savexmm *);
168 static void fill_fpregs_xmm(struct savexmm *, struct save87 *);
169 #endif /* CPU_ENABLE_SSE */
170 SYSINIT(cpu, SI_SUB_CPU, SI_ORDER_FIRST, cpu_startup, NULL)
173 extern vm_offset_t ksym_start, ksym_end;
176 int _udatasel, _ucodesel;
182 static void osendsig(sig_t catcher, ksiginfo_t *, sigset_t *mask);
184 #ifdef COMPAT_FREEBSD4
185 static void freebsd4_sendsig(sig_t catcher, ksiginfo_t *, sigset_t *mask);
191 vm_paddr_t phys_avail[10];
192 vm_paddr_t dump_avail[10];
194 /* must be 2 less so 0 0 can signal end of chunks */
195 #define PHYS_AVAIL_ARRAY_END ((sizeof(phys_avail) / sizeof(phys_avail[0])) - 2)
196 #define DUMP_AVAIL_ARRAY_END ((sizeof(dump_avail) / sizeof(dump_avail[0])) - 2)
198 struct kva_md_info kmi;
200 static struct trapframe proc0_tf;
202 static struct pcpu __pcpu;
207 struct mem_range_softc mem_range_softc;
214 * Good {morning,afternoon,evening,night}.
218 panicifcpuunsupported();
222 printf("real memory = %ju (%ju MB)\n", ptoa((uintmax_t)Maxmem),
223 ptoa((uintmax_t)Maxmem) / 1048576);
226 * Display any holes after the first chunk of extended memory.
231 printf("Physical memory chunk(s):\n");
232 for (indx = 0; phys_avail[indx + 1] != 0; indx += 2) {
235 size = phys_avail[indx + 1] - phys_avail[indx];
237 "0x%016jx - 0x%016jx, %ju bytes (%ju pages)\n",
238 (uintmax_t)phys_avail[indx],
239 (uintmax_t)phys_avail[indx + 1] - 1,
240 (uintmax_t)size, (uintmax_t)size / PAGE_SIZE);
244 vm_ksubmap_init(&kmi);
246 printf("avail memory = %ju (%ju MB)\n",
247 ptoa((uintmax_t)cnt.v_free_count),
248 ptoa((uintmax_t)cnt.v_free_count) / 1048576);
251 * Set up buffers, so they can be used to read disk labels.
254 vm_pager_bufferinit();
260 * Send an interrupt to process.
262 * Stack is set up to allow sigcode stored
263 * at top to call routine, followed by kcall
264 * to sigreturn routine below. After sigreturn
265 * resets the signal mask, the stack, and the
266 * frame pointer, it returns to the user
271 osendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
273 struct osigframe sf, *fp;
277 struct trapframe *regs;
283 PROC_LOCK_ASSERT(p, MA_OWNED);
284 sig = ksi->ksi_signo;
286 mtx_assert(&psp->ps_mtx, MA_OWNED);
288 oonstack = sigonstack(regs->tf_esp);
290 /* Allocate space for the signal handler context. */
291 if ((td->td_pflags & TDP_ALTSTACK) && !oonstack &&
292 SIGISMEMBER(psp->ps_sigonstack, sig)) {
293 fp = (struct osigframe *)(td->td_sigstk.ss_sp +
294 td->td_sigstk.ss_size - sizeof(struct osigframe));
295 #if defined(COMPAT_43)
296 td->td_sigstk.ss_flags |= SS_ONSTACK;
299 fp = (struct osigframe *)regs->tf_esp - 1;
301 /* Translate the signal if appropriate. */
302 if (p->p_sysent->sv_sigtbl && sig <= p->p_sysent->sv_sigsize)
303 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)];
305 /* Build the argument list for the signal handler. */
307 sf.sf_scp = (register_t)&fp->sf_siginfo.si_sc;
308 if (SIGISMEMBER(psp->ps_siginfo, sig)) {
309 /* Signal handler installed with SA_SIGINFO. */
310 sf.sf_arg2 = (register_t)&fp->sf_siginfo;
311 sf.sf_siginfo.si_signo = sig;
312 sf.sf_siginfo.si_code = ksi->ksi_code;
313 sf.sf_ahu.sf_action = (__osiginfohandler_t *)catcher;
315 /* Old FreeBSD-style arguments. */
316 sf.sf_arg2 = ksi->ksi_code;
317 sf.sf_addr = (register_t)ksi->ksi_addr;
318 sf.sf_ahu.sf_handler = catcher;
320 mtx_unlock(&psp->ps_mtx);
323 /* Save most if not all of trap frame. */
324 sf.sf_siginfo.si_sc.sc_eax = regs->tf_eax;
325 sf.sf_siginfo.si_sc.sc_ebx = regs->tf_ebx;
326 sf.sf_siginfo.si_sc.sc_ecx = regs->tf_ecx;
327 sf.sf_siginfo.si_sc.sc_edx = regs->tf_edx;
328 sf.sf_siginfo.si_sc.sc_esi = regs->tf_esi;
329 sf.sf_siginfo.si_sc.sc_edi = regs->tf_edi;
330 sf.sf_siginfo.si_sc.sc_cs = regs->tf_cs;
331 sf.sf_siginfo.si_sc.sc_ds = regs->tf_ds;
332 sf.sf_siginfo.si_sc.sc_ss = regs->tf_ss;
333 sf.sf_siginfo.si_sc.sc_es = regs->tf_es;
334 sf.sf_siginfo.si_sc.sc_fs = regs->tf_fs;
335 sf.sf_siginfo.si_sc.sc_gs = rgs();
336 sf.sf_siginfo.si_sc.sc_isp = regs->tf_isp;
338 /* Build the signal context to be used by osigreturn(). */
339 sf.sf_siginfo.si_sc.sc_onstack = (oonstack) ? 1 : 0;
340 SIG2OSIG(*mask, sf.sf_siginfo.si_sc.sc_mask);
341 sf.sf_siginfo.si_sc.sc_sp = regs->tf_esp;
342 sf.sf_siginfo.si_sc.sc_fp = regs->tf_ebp;
343 sf.sf_siginfo.si_sc.sc_pc = regs->tf_eip;
344 sf.sf_siginfo.si_sc.sc_ps = regs->tf_eflags;
345 sf.sf_siginfo.si_sc.sc_trapno = regs->tf_trapno;
346 sf.sf_siginfo.si_sc.sc_err = regs->tf_err;
349 * If we're a vm86 process, we want to save the segment registers.
350 * We also change eflags to be our emulated eflags, not the actual
353 if (regs->tf_eflags & PSL_VM) {
354 /* XXX confusing names: `tf' isn't a trapframe; `regs' is. */
355 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs;
356 struct vm86_kernel *vm86 = &td->td_pcb->pcb_ext->ext_vm86;
358 sf.sf_siginfo.si_sc.sc_gs = tf->tf_vm86_gs;
359 sf.sf_siginfo.si_sc.sc_fs = tf->tf_vm86_fs;
360 sf.sf_siginfo.si_sc.sc_es = tf->tf_vm86_es;
361 sf.sf_siginfo.si_sc.sc_ds = tf->tf_vm86_ds;
363 if (vm86->vm86_has_vme == 0)
364 sf.sf_siginfo.si_sc.sc_ps =
365 (tf->tf_eflags & ~(PSL_VIF | PSL_VIP)) |
366 (vm86->vm86_eflags & (PSL_VIF | PSL_VIP));
368 /* See sendsig() for comments. */
369 tf->tf_eflags &= ~(PSL_VM | PSL_NT | PSL_VIF | PSL_VIP);
373 * Copy the sigframe out to the user's stack.
375 if (copyout(&sf, fp, sizeof(*fp)) != 0) {
377 printf("process %ld has trashed its stack\n", (long)p->p_pid);
383 regs->tf_esp = (int)fp;
384 regs->tf_eip = PS_STRINGS - szosigcode;
385 regs->tf_eflags &= ~PSL_T;
386 regs->tf_cs = _ucodesel;
387 regs->tf_ds = _udatasel;
388 regs->tf_es = _udatasel;
389 regs->tf_fs = _udatasel;
391 regs->tf_ss = _udatasel;
393 mtx_lock(&psp->ps_mtx);
395 #endif /* COMPAT_43 */
397 #ifdef COMPAT_FREEBSD4
399 freebsd4_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
401 struct sigframe4 sf, *sfp;
405 struct trapframe *regs;
411 PROC_LOCK_ASSERT(p, MA_OWNED);
412 sig = ksi->ksi_signo;
414 mtx_assert(&psp->ps_mtx, MA_OWNED);
416 oonstack = sigonstack(regs->tf_esp);
418 /* Save user context. */
419 bzero(&sf, sizeof(sf));
420 sf.sf_uc.uc_sigmask = *mask;
421 sf.sf_uc.uc_stack = td->td_sigstk;
422 sf.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK)
423 ? ((oonstack) ? SS_ONSTACK : 0) : SS_DISABLE;
424 sf.sf_uc.uc_mcontext.mc_onstack = (oonstack) ? 1 : 0;
425 sf.sf_uc.uc_mcontext.mc_gs = rgs();
426 bcopy(regs, &sf.sf_uc.uc_mcontext.mc_fs, sizeof(*regs));
428 /* Allocate space for the signal handler context. */
429 if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack &&
430 SIGISMEMBER(psp->ps_sigonstack, sig)) {
431 sfp = (struct sigframe4 *)(td->td_sigstk.ss_sp +
432 td->td_sigstk.ss_size - sizeof(struct sigframe4));
433 #if defined(COMPAT_43)
434 td->td_sigstk.ss_flags |= SS_ONSTACK;
437 sfp = (struct sigframe4 *)regs->tf_esp - 1;
439 /* Translate the signal if appropriate. */
440 if (p->p_sysent->sv_sigtbl && sig <= p->p_sysent->sv_sigsize)
441 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)];
443 /* Build the argument list for the signal handler. */
445 sf.sf_ucontext = (register_t)&sfp->sf_uc;
446 if (SIGISMEMBER(psp->ps_siginfo, sig)) {
447 /* Signal handler installed with SA_SIGINFO. */
448 sf.sf_siginfo = (register_t)&sfp->sf_si;
449 sf.sf_ahu.sf_action = (__siginfohandler_t *)catcher;
451 /* Fill in POSIX parts */
452 sf.sf_si.si_signo = sig;
453 sf.sf_si.si_code = ksi->ksi_code;
454 sf.sf_si.si_addr = ksi->ksi_addr;
456 /* Old FreeBSD-style arguments. */
457 sf.sf_siginfo = ksi->ksi_code;
458 sf.sf_addr = (register_t)ksi->ksi_addr;
459 sf.sf_ahu.sf_handler = catcher;
461 mtx_unlock(&psp->ps_mtx);
465 * If we're a vm86 process, we want to save the segment registers.
466 * We also change eflags to be our emulated eflags, not the actual
469 if (regs->tf_eflags & PSL_VM) {
470 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs;
471 struct vm86_kernel *vm86 = &td->td_pcb->pcb_ext->ext_vm86;
473 sf.sf_uc.uc_mcontext.mc_gs = tf->tf_vm86_gs;
474 sf.sf_uc.uc_mcontext.mc_fs = tf->tf_vm86_fs;
475 sf.sf_uc.uc_mcontext.mc_es = tf->tf_vm86_es;
476 sf.sf_uc.uc_mcontext.mc_ds = tf->tf_vm86_ds;
478 if (vm86->vm86_has_vme == 0)
479 sf.sf_uc.uc_mcontext.mc_eflags =
480 (tf->tf_eflags & ~(PSL_VIF | PSL_VIP)) |
481 (vm86->vm86_eflags & (PSL_VIF | PSL_VIP));
484 * Clear PSL_NT to inhibit T_TSSFLT faults on return from
485 * syscalls made by the signal handler. This just avoids
486 * wasting time for our lazy fixup of such faults. PSL_NT
487 * does nothing in vm86 mode, but vm86 programs can set it
488 * almost legitimately in probes for old cpu types.
490 tf->tf_eflags &= ~(PSL_VM | PSL_NT | PSL_VIF | PSL_VIP);
494 * Copy the sigframe out to the user's stack.
496 if (copyout(&sf, sfp, sizeof(*sfp)) != 0) {
498 printf("process %ld has trashed its stack\n", (long)p->p_pid);
504 regs->tf_esp = (int)sfp;
505 regs->tf_eip = PS_STRINGS - szfreebsd4_sigcode;
506 regs->tf_eflags &= ~PSL_T;
507 regs->tf_cs = _ucodesel;
508 regs->tf_ds = _udatasel;
509 regs->tf_es = _udatasel;
510 regs->tf_fs = _udatasel;
511 regs->tf_ss = _udatasel;
513 mtx_lock(&psp->ps_mtx);
515 #endif /* COMPAT_FREEBSD4 */
518 sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
520 struct sigframe sf, *sfp;
525 struct trapframe *regs;
531 PROC_LOCK_ASSERT(p, MA_OWNED);
532 sig = ksi->ksi_signo;
534 mtx_assert(&psp->ps_mtx, MA_OWNED);
535 #ifdef COMPAT_FREEBSD4
536 if (SIGISMEMBER(psp->ps_freebsd4, sig)) {
537 freebsd4_sendsig(catcher, ksi, mask);
542 if (SIGISMEMBER(psp->ps_osigset, sig)) {
543 osendsig(catcher, ksi, mask);
548 oonstack = sigonstack(regs->tf_esp);
550 /* Save user context. */
551 bzero(&sf, sizeof(sf));
552 sf.sf_uc.uc_sigmask = *mask;
553 sf.sf_uc.uc_stack = td->td_sigstk;
554 sf.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK)
555 ? ((oonstack) ? SS_ONSTACK : 0) : SS_DISABLE;
556 sf.sf_uc.uc_mcontext.mc_onstack = (oonstack) ? 1 : 0;
557 sf.sf_uc.uc_mcontext.mc_gs = rgs();
558 bcopy(regs, &sf.sf_uc.uc_mcontext.mc_fs, sizeof(*regs));
559 sf.sf_uc.uc_mcontext.mc_len = sizeof(sf.sf_uc.uc_mcontext); /* magic */
560 get_fpcontext(td, &sf.sf_uc.uc_mcontext);
563 /* Allocate space for the signal handler context. */
564 if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack &&
565 SIGISMEMBER(psp->ps_sigonstack, sig)) {
566 sp = td->td_sigstk.ss_sp +
567 td->td_sigstk.ss_size - sizeof(struct sigframe);
568 #if defined(COMPAT_43)
569 td->td_sigstk.ss_flags |= SS_ONSTACK;
572 sp = (char *)regs->tf_esp - sizeof(struct sigframe);
573 /* Align to 16 bytes. */
574 sfp = (struct sigframe *)((unsigned int)sp & ~0xF);
576 /* Translate the signal if appropriate. */
577 if (p->p_sysent->sv_sigtbl && sig <= p->p_sysent->sv_sigsize)
578 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)];
580 /* Build the argument list for the signal handler. */
582 sf.sf_ucontext = (register_t)&sfp->sf_uc;
583 if (SIGISMEMBER(psp->ps_siginfo, sig)) {
584 /* Signal handler installed with SA_SIGINFO. */
585 sf.sf_siginfo = (register_t)&sfp->sf_si;
586 sf.sf_ahu.sf_action = (__siginfohandler_t *)catcher;
588 /* Fill in POSIX parts */
589 sf.sf_si = ksi->ksi_info;
590 sf.sf_si.si_signo = sig; /* maybe a translated signal */
592 /* Old FreeBSD-style arguments. */
593 sf.sf_siginfo = ksi->ksi_code;
594 sf.sf_addr = (register_t)ksi->ksi_addr;
595 sf.sf_ahu.sf_handler = catcher;
597 mtx_unlock(&psp->ps_mtx);
601 * If we're a vm86 process, we want to save the segment registers.
602 * We also change eflags to be our emulated eflags, not the actual
605 if (regs->tf_eflags & PSL_VM) {
606 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs;
607 struct vm86_kernel *vm86 = &td->td_pcb->pcb_ext->ext_vm86;
609 sf.sf_uc.uc_mcontext.mc_gs = tf->tf_vm86_gs;
610 sf.sf_uc.uc_mcontext.mc_fs = tf->tf_vm86_fs;
611 sf.sf_uc.uc_mcontext.mc_es = tf->tf_vm86_es;
612 sf.sf_uc.uc_mcontext.mc_ds = tf->tf_vm86_ds;
614 if (vm86->vm86_has_vme == 0)
615 sf.sf_uc.uc_mcontext.mc_eflags =
616 (tf->tf_eflags & ~(PSL_VIF | PSL_VIP)) |
617 (vm86->vm86_eflags & (PSL_VIF | PSL_VIP));
620 * Clear PSL_NT to inhibit T_TSSFLT faults on return from
621 * syscalls made by the signal handler. This just avoids
622 * wasting time for our lazy fixup of such faults. PSL_NT
623 * does nothing in vm86 mode, but vm86 programs can set it
624 * almost legitimately in probes for old cpu types.
626 tf->tf_eflags &= ~(PSL_VM | PSL_NT | PSL_VIF | PSL_VIP);
630 * Copy the sigframe out to the user's stack.
632 if (copyout(&sf, sfp, sizeof(*sfp)) != 0) {
634 printf("process %ld has trashed its stack\n", (long)p->p_pid);
640 regs->tf_esp = (int)sfp;
641 regs->tf_eip = PS_STRINGS - *(p->p_sysent->sv_szsigcode);
642 regs->tf_eflags &= ~PSL_T;
643 regs->tf_cs = _ucodesel;
644 regs->tf_ds = _udatasel;
645 regs->tf_es = _udatasel;
646 regs->tf_fs = _udatasel;
647 regs->tf_ss = _udatasel;
649 mtx_lock(&psp->ps_mtx);
653 * System call to cleanup state after a signal
654 * has been taken. Reset signal mask and
655 * stack state from context left by sendsig (above).
656 * Return to previous pc and psl as specified by
657 * context left by sendsig. Check carefully to
658 * make sure that the user has not modified the
659 * state to gain improper privileges.
667 struct osigreturn_args /* {
668 struct osigcontext *sigcntxp;
671 struct osigcontext sc;
672 struct trapframe *regs;
673 struct osigcontext *scp;
674 struct proc *p = td->td_proc;
679 error = copyin(uap->sigcntxp, &sc, sizeof(sc));
684 if (eflags & PSL_VM) {
685 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs;
686 struct vm86_kernel *vm86;
689 * if pcb_ext == 0 or vm86_inited == 0, the user hasn't
690 * set up the vm86 area, and we can't enter vm86 mode.
692 if (td->td_pcb->pcb_ext == 0)
694 vm86 = &td->td_pcb->pcb_ext->ext_vm86;
695 if (vm86->vm86_inited == 0)
698 /* Go back to user mode if both flags are set. */
699 if ((eflags & PSL_VIP) && (eflags & PSL_VIF)) {
700 ksiginfo_init_trap(&ksi);
701 ksi.ksi_signo = SIGBUS;
702 ksi.ksi_code = BUS_OBJERR;
703 ksi.ksi_addr = (void *)regs->tf_eip;
704 trapsignal(td, &ksi);
707 if (vm86->vm86_has_vme) {
708 eflags = (tf->tf_eflags & ~VME_USERCHANGE) |
709 (eflags & VME_USERCHANGE) | PSL_VM;
711 vm86->vm86_eflags = eflags; /* save VIF, VIP */
712 eflags = (tf->tf_eflags & ~VM_USERCHANGE) |
713 (eflags & VM_USERCHANGE) | PSL_VM;
715 tf->tf_vm86_ds = scp->sc_ds;
716 tf->tf_vm86_es = scp->sc_es;
717 tf->tf_vm86_fs = scp->sc_fs;
718 tf->tf_vm86_gs = scp->sc_gs;
719 tf->tf_ds = _udatasel;
720 tf->tf_es = _udatasel;
721 tf->tf_fs = _udatasel;
724 * Don't allow users to change privileged or reserved flags.
727 * XXX do allow users to change the privileged flag PSL_RF.
728 * The cpu sets PSL_RF in tf_eflags for faults. Debuggers
729 * should sometimes set it there too. tf_eflags is kept in
730 * the signal context during signal handling and there is no
731 * other place to remember it, so the PSL_RF bit may be
732 * corrupted by the signal handler without us knowing.
733 * Corruption of the PSL_RF bit at worst causes one more or
734 * one less debugger trap, so allowing it is fairly harmless.
736 if (!EFL_SECURE(eflags & ~PSL_RF, regs->tf_eflags & ~PSL_RF)) {
741 * Don't allow users to load a valid privileged %cs. Let the
742 * hardware check for invalid selectors, excess privilege in
743 * other selectors, invalid %eip's and invalid %esp's.
745 if (!CS_SECURE(scp->sc_cs)) {
746 ksiginfo_init_trap(&ksi);
747 ksi.ksi_signo = SIGBUS;
748 ksi.ksi_code = BUS_OBJERR;
749 ksi.ksi_trapno = T_PROTFLT;
750 ksi.ksi_addr = (void *)regs->tf_eip;
751 trapsignal(td, &ksi);
754 regs->tf_ds = scp->sc_ds;
755 regs->tf_es = scp->sc_es;
756 regs->tf_fs = scp->sc_fs;
759 /* Restore remaining registers. */
760 regs->tf_eax = scp->sc_eax;
761 regs->tf_ebx = scp->sc_ebx;
762 regs->tf_ecx = scp->sc_ecx;
763 regs->tf_edx = scp->sc_edx;
764 regs->tf_esi = scp->sc_esi;
765 regs->tf_edi = scp->sc_edi;
766 regs->tf_cs = scp->sc_cs;
767 regs->tf_ss = scp->sc_ss;
768 regs->tf_isp = scp->sc_isp;
769 regs->tf_ebp = scp->sc_fp;
770 regs->tf_esp = scp->sc_sp;
771 regs->tf_eip = scp->sc_pc;
772 regs->tf_eflags = eflags;
775 #if defined(COMPAT_43)
776 if (scp->sc_onstack & 1)
777 td->td_sigstk.ss_flags |= SS_ONSTACK;
779 td->td_sigstk.ss_flags &= ~SS_ONSTACK;
781 SIGSETOLD(td->td_sigmask, scp->sc_mask);
782 SIG_CANTMASK(td->td_sigmask);
785 return (EJUSTRETURN);
787 #endif /* COMPAT_43 */
789 #ifdef COMPAT_FREEBSD4
794 freebsd4_sigreturn(td, uap)
796 struct freebsd4_sigreturn_args /* {
797 const ucontext4 *sigcntxp;
801 struct proc *p = td->td_proc;
802 struct trapframe *regs;
803 const struct ucontext4 *ucp;
804 int cs, eflags, error;
807 error = copyin(uap->sigcntxp, &uc, sizeof(uc));
812 eflags = ucp->uc_mcontext.mc_eflags;
813 if (eflags & PSL_VM) {
814 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs;
815 struct vm86_kernel *vm86;
818 * if pcb_ext == 0 or vm86_inited == 0, the user hasn't
819 * set up the vm86 area, and we can't enter vm86 mode.
821 if (td->td_pcb->pcb_ext == 0)
823 vm86 = &td->td_pcb->pcb_ext->ext_vm86;
824 if (vm86->vm86_inited == 0)
827 /* Go back to user mode if both flags are set. */
828 if ((eflags & PSL_VIP) && (eflags & PSL_VIF)) {
829 ksiginfo_init_trap(&ksi);
830 ksi.ksi_signo = SIGBUS;
831 ksi.ksi_code = BUS_OBJERR;
832 ksi.ksi_addr = (void *)regs->tf_eip;
833 trapsignal(td, &ksi);
835 if (vm86->vm86_has_vme) {
836 eflags = (tf->tf_eflags & ~VME_USERCHANGE) |
837 (eflags & VME_USERCHANGE) | PSL_VM;
839 vm86->vm86_eflags = eflags; /* save VIF, VIP */
840 eflags = (tf->tf_eflags & ~VM_USERCHANGE) |
841 (eflags & VM_USERCHANGE) | PSL_VM;
843 bcopy(&ucp->uc_mcontext.mc_fs, tf, sizeof(struct trapframe));
844 tf->tf_eflags = eflags;
845 tf->tf_vm86_ds = tf->tf_ds;
846 tf->tf_vm86_es = tf->tf_es;
847 tf->tf_vm86_fs = tf->tf_fs;
848 tf->tf_vm86_gs = ucp->uc_mcontext.mc_gs;
849 tf->tf_ds = _udatasel;
850 tf->tf_es = _udatasel;
851 tf->tf_fs = _udatasel;
854 * Don't allow users to change privileged or reserved flags.
857 * XXX do allow users to change the privileged flag PSL_RF.
858 * The cpu sets PSL_RF in tf_eflags for faults. Debuggers
859 * should sometimes set it there too. tf_eflags is kept in
860 * the signal context during signal handling and there is no
861 * other place to remember it, so the PSL_RF bit may be
862 * corrupted by the signal handler without us knowing.
863 * Corruption of the PSL_RF bit at worst causes one more or
864 * one less debugger trap, so allowing it is fairly harmless.
866 if (!EFL_SECURE(eflags & ~PSL_RF, regs->tf_eflags & ~PSL_RF)) {
867 printf("freebsd4_sigreturn: eflags = 0x%x\n", eflags);
872 * Don't allow users to load a valid privileged %cs. Let the
873 * hardware check for invalid selectors, excess privilege in
874 * other selectors, invalid %eip's and invalid %esp's.
876 cs = ucp->uc_mcontext.mc_cs;
877 if (!CS_SECURE(cs)) {
878 printf("freebsd4_sigreturn: cs = 0x%x\n", cs);
879 ksiginfo_init_trap(&ksi);
880 ksi.ksi_signo = SIGBUS;
881 ksi.ksi_code = BUS_OBJERR;
882 ksi.ksi_trapno = T_PROTFLT;
883 ksi.ksi_addr = (void *)regs->tf_eip;
884 trapsignal(td, &ksi);
888 bcopy(&ucp->uc_mcontext.mc_fs, regs, sizeof(*regs));
892 #if defined(COMPAT_43)
893 if (ucp->uc_mcontext.mc_onstack & 1)
894 td->td_sigstk.ss_flags |= SS_ONSTACK;
896 td->td_sigstk.ss_flags &= ~SS_ONSTACK;
899 td->td_sigmask = ucp->uc_sigmask;
900 SIG_CANTMASK(td->td_sigmask);
903 return (EJUSTRETURN);
905 #endif /* COMPAT_FREEBSD4 */
913 struct sigreturn_args /* {
914 const struct __ucontext *sigcntxp;
918 struct proc *p = td->td_proc;
919 struct trapframe *regs;
920 const ucontext_t *ucp;
921 int cs, eflags, error, ret;
924 error = copyin(uap->sigcntxp, &uc, sizeof(uc));
929 eflags = ucp->uc_mcontext.mc_eflags;
930 if (eflags & PSL_VM) {
931 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs;
932 struct vm86_kernel *vm86;
935 * if pcb_ext == 0 or vm86_inited == 0, the user hasn't
936 * set up the vm86 area, and we can't enter vm86 mode.
938 if (td->td_pcb->pcb_ext == 0)
940 vm86 = &td->td_pcb->pcb_ext->ext_vm86;
941 if (vm86->vm86_inited == 0)
944 /* Go back to user mode if both flags are set. */
945 if ((eflags & PSL_VIP) && (eflags & PSL_VIF)) {
946 ksiginfo_init_trap(&ksi);
947 ksi.ksi_signo = SIGBUS;
948 ksi.ksi_code = BUS_OBJERR;
949 ksi.ksi_addr = (void *)regs->tf_eip;
950 trapsignal(td, &ksi);
953 if (vm86->vm86_has_vme) {
954 eflags = (tf->tf_eflags & ~VME_USERCHANGE) |
955 (eflags & VME_USERCHANGE) | PSL_VM;
957 vm86->vm86_eflags = eflags; /* save VIF, VIP */
958 eflags = (tf->tf_eflags & ~VM_USERCHANGE) |
959 (eflags & VM_USERCHANGE) | PSL_VM;
961 bcopy(&ucp->uc_mcontext.mc_fs, tf, sizeof(struct trapframe));
962 tf->tf_eflags = eflags;
963 tf->tf_vm86_ds = tf->tf_ds;
964 tf->tf_vm86_es = tf->tf_es;
965 tf->tf_vm86_fs = tf->tf_fs;
966 tf->tf_vm86_gs = ucp->uc_mcontext.mc_gs;
967 tf->tf_ds = _udatasel;
968 tf->tf_es = _udatasel;
969 tf->tf_fs = _udatasel;
972 * Don't allow users to change privileged or reserved flags.
975 * XXX do allow users to change the privileged flag PSL_RF.
976 * The cpu sets PSL_RF in tf_eflags for faults. Debuggers
977 * should sometimes set it there too. tf_eflags is kept in
978 * the signal context during signal handling and there is no
979 * other place to remember it, so the PSL_RF bit may be
980 * corrupted by the signal handler without us knowing.
981 * Corruption of the PSL_RF bit at worst causes one more or
982 * one less debugger trap, so allowing it is fairly harmless.
984 if (!EFL_SECURE(eflags & ~PSL_RF, regs->tf_eflags & ~PSL_RF)) {
985 printf("sigreturn: eflags = 0x%x\n", eflags);
990 * Don't allow users to load a valid privileged %cs. Let the
991 * hardware check for invalid selectors, excess privilege in
992 * other selectors, invalid %eip's and invalid %esp's.
994 cs = ucp->uc_mcontext.mc_cs;
995 if (!CS_SECURE(cs)) {
996 printf("sigreturn: cs = 0x%x\n", cs);
997 ksiginfo_init_trap(&ksi);
998 ksi.ksi_signo = SIGBUS;
999 ksi.ksi_code = BUS_OBJERR;
1000 ksi.ksi_trapno = T_PROTFLT;
1001 ksi.ksi_addr = (void *)regs->tf_eip;
1002 trapsignal(td, &ksi);
1006 ret = set_fpcontext(td, &ucp->uc_mcontext);
1009 bcopy(&ucp->uc_mcontext.mc_fs, regs, sizeof(*regs));
1013 #if defined(COMPAT_43)
1014 if (ucp->uc_mcontext.mc_onstack & 1)
1015 td->td_sigstk.ss_flags |= SS_ONSTACK;
1017 td->td_sigstk.ss_flags &= ~SS_ONSTACK;
1020 td->td_sigmask = ucp->uc_sigmask;
1021 SIG_CANTMASK(td->td_sigmask);
1024 return (EJUSTRETURN);
1028 * Machine dependent boot() routine
1030 * I haven't seen anything to put here yet
1031 * Possibly some stuff might be grafted back here from boot()
1038 /* Get current clock frequency for the given cpu id. */
1040 cpu_est_clockrate(int cpu_id, uint64_t *rate)
1043 uint64_t tsc1, tsc2;
1045 if (pcpu_find(cpu_id) == NULL || rate == NULL)
1048 return (EOPNOTSUPP);
1050 /* If we're booting, trust the rate calibrated moments ago. */
1057 /* Schedule ourselves on the indicated cpu. */
1058 mtx_lock_spin(&sched_lock);
1059 sched_bind(curthread, cpu_id);
1060 mtx_unlock_spin(&sched_lock);
1063 /* Calibrate by measuring a short delay. */
1064 reg = intr_disable();
1071 mtx_lock_spin(&sched_lock);
1072 sched_unbind(curthread);
1073 mtx_unlock_spin(&sched_lock);
1077 * Calculate the difference in readings, convert to Mhz, and
1078 * subtract 0.5% of the total. Empirical testing has shown that
1079 * overhead in DELAY() works out to approximately this value.
1082 *rate = tsc2 * 1000 - tsc2 * 5;
1087 * Shutdown the CPU as much as possible
1097 * Hook to idle the CPU when possible. In the SMP case we default to
1098 * off because a halted cpu will not currently pick up a new thread in the
1099 * run queue until the next timer tick. If turned on this will result in
1100 * approximately a 4.2% loss in real time performance in buildworld tests
1101 * (but improves user and sys times oddly enough), and saves approximately
1102 * 5% in power consumption on an idle machine (tests w/2xCPU 1.1GHz P3).
1104 * XXX we need to have a cpu mask of idle cpus and generate an IPI or
1105 * otherwise generate some sort of interrupt to wake up cpus sitting in HLT.
1106 * Then we can have our cake and eat it too.
1108 * XXX I'm turning it on for SMP as well by default for now. It seems to
1109 * help lock contention somewhat, and this is critical for HTT. -Peter
1111 static int cpu_idle_hlt = 1;
1112 SYSCTL_INT(_machdep, OID_AUTO, cpu_idle_hlt, CTLFLAG_RW,
1113 &cpu_idle_hlt, 0, "Idle loop HLT enable");
1116 cpu_idle_default(void)
1119 * we must absolutely guarentee that hlt is the
1120 * absolute next instruction after sti or we
1121 * introduce a timing window.
1123 __asm __volatile("sti; hlt");
1127 * Note that we have to be careful here to avoid a race between checking
1128 * sched_runnable() and actually halting. If we don't do this, we may waste
1129 * the time between calling hlt and the next interrupt even though there
1130 * is a runnable process.
1137 if (mp_grab_cpu_hlt())
1143 if (sched_runnable())
1150 /* Other subsystems (e.g., ACPI) can hook this later. */
1151 void (*cpu_idle_hook)(void) = cpu_idle_default;
1154 * Clear registers on exec
1157 exec_setregs(td, entry, stack, ps_strings)
1163 struct trapframe *regs = td->td_frame;
1164 struct pcb *pcb = td->td_pcb;
1166 /* Reset pc->pcb_gs and %gs before possibly invalidating it. */
1167 pcb->pcb_gs = _udatasel;
1170 if (td->td_proc->p_md.md_ldt)
1173 bzero((char *)regs, sizeof(struct trapframe));
1174 regs->tf_eip = entry;
1175 regs->tf_esp = stack;
1176 regs->tf_eflags = PSL_USER | (regs->tf_eflags & PSL_T);
1177 regs->tf_ss = _udatasel;
1178 regs->tf_ds = _udatasel;
1179 regs->tf_es = _udatasel;
1180 regs->tf_fs = _udatasel;
1181 regs->tf_cs = _ucodesel;
1183 /* PS_STRINGS value for BSD/OS binaries. It is 0 for non-BSD/OS. */
1184 regs->tf_ebx = ps_strings;
1187 * Reset the hardware debug registers if they were in use.
1188 * They won't have any meaning for the newly exec'd process.
1190 if (pcb->pcb_flags & PCB_DBREGS) {
1197 if (pcb == PCPU_GET(curpcb)) {
1199 * Clear the debug registers on the running
1200 * CPU, otherwise they will end up affecting
1201 * the next process we switch to.
1205 pcb->pcb_flags &= ~PCB_DBREGS;
1209 * Initialize the math emulator (if any) for the current process.
1210 * Actually, just clear the bit that says that the emulator has
1211 * been initialized. Initialization is delayed until the process
1212 * traps to the emulator (if it is done at all) mainly because
1213 * emulators don't provide an entry point for initialization.
1215 td->td_pcb->pcb_flags &= ~FP_SOFTFP;
1218 * Drop the FP state if we hold it, so that the process gets a
1219 * clean FP state if it uses the FPU again.
1224 * XXX - Linux emulator
1225 * Make sure sure edx is 0x0 on entry. Linux binaries depend
1228 td->td_retval[1] = 0;
1239 * CR0_MP, CR0_NE and CR0_TS are set for NPX (FPU) support:
1241 * Prepare to trap all ESC (i.e., NPX) instructions and all WAIT
1242 * instructions. We must set the CR0_MP bit and use the CR0_TS
1243 * bit to control the trap, because setting the CR0_EM bit does
1244 * not cause WAIT instructions to trap. It's important to trap
1245 * WAIT instructions - otherwise the "wait" variants of no-wait
1246 * control instructions would degenerate to the "no-wait" variants
1247 * after FP context switches but work correctly otherwise. It's
1248 * particularly important to trap WAITs when there is no NPX -
1249 * otherwise the "wait" variants would always degenerate.
1251 * Try setting CR0_NE to get correct error reporting on 486DX's.
1252 * Setting it should fail or do nothing on lesser processors.
1254 cr0 |= CR0_MP | CR0_NE | CR0_TS | CR0_WP | CR0_AM;
1260 sysctl_machdep_adjkerntz(SYSCTL_HANDLER_ARGS)
1263 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2,
1265 if (!error && req->newptr)
1270 SYSCTL_PROC(_machdep, OID_AUTO, adjkerntz, CTLTYPE_INT|CTLFLAG_RW,
1271 &adjkerntz, 0, sysctl_machdep_adjkerntz, "I", "");
1273 SYSCTL_INT(_machdep, OID_AUTO, disable_rtc_set,
1274 CTLFLAG_RW, &disable_rtc_set, 0, "");
1276 SYSCTL_STRUCT(_machdep, OID_AUTO, bootinfo,
1277 CTLFLAG_RD, &bootinfo, bootinfo, "");
1279 SYSCTL_INT(_machdep, OID_AUTO, wall_cmos_clock,
1280 CTLFLAG_RW, &wall_cmos_clock, 0, "");
1282 u_long bootdev; /* not a struct cdev *- encoding is different */
1283 SYSCTL_ULONG(_machdep, OID_AUTO, guessed_bootdev,
1284 CTLFLAG_RD, &bootdev, 0, "Maybe the Boot device (not in struct cdev *format)");
1287 * Initialize 386 and configure to run kernel
1291 * Initialize segments & interrupt table
1295 union descriptor gdt[NGDT * MAXCPU]; /* global descriptor table */
1296 static struct gate_descriptor idt0[NIDT];
1297 struct gate_descriptor *idt = &idt0[0]; /* interrupt descriptor table */
1298 union descriptor ldt[NLDT]; /* local descriptor table */
1299 struct region_descriptor r_gdt, r_idt; /* table descriptors */
1301 #if defined(I586_CPU) && !defined(NO_F00F_HACK)
1302 extern int has_f00f_bug;
1305 static struct i386tss dblfault_tss;
1306 static char dblfault_stack[PAGE_SIZE];
1308 extern vm_offset_t proc0kstack;
1312 * software prototypes -- in more palatable form.
1314 * GCODE_SEL through GUDATA_SEL must be in this order for syscall/sysret
1315 * GUFS_SEL and GUGS_SEL must be in this order (swtch.s knows it)
1317 struct soft_segment_descriptor gdt_segs[] = {
1318 /* GNULL_SEL 0 Null Descriptor */
1319 { 0x0, /* segment base address */
1321 0, /* segment type */
1322 0, /* segment descriptor priority level */
1323 0, /* segment descriptor present */
1325 0, /* default 32 vs 16 bit size */
1326 0 /* limit granularity (byte/page units)*/ },
1327 /* GPRIV_SEL 1 SMP Per-Processor Private Data Descriptor */
1328 { 0x0, /* segment base address */
1329 0xfffff, /* length - all address space */
1330 SDT_MEMRWA, /* segment type */
1331 0, /* segment descriptor priority level */
1332 1, /* segment descriptor present */
1334 1, /* default 32 vs 16 bit size */
1335 1 /* limit granularity (byte/page units)*/ },
1336 /* GUFS_SEL 2 %fs Descriptor for user */
1337 { 0x0, /* segment base address */
1338 0xfffff, /* length - all address space */
1339 SDT_MEMRWA, /* segment type */
1340 SEL_UPL, /* segment descriptor priority level */
1341 1, /* segment descriptor present */
1343 1, /* default 32 vs 16 bit size */
1344 1 /* limit granularity (byte/page units)*/ },
1345 /* GUGS_SEL 3 %gs Descriptor for user */
1346 { 0x0, /* segment base address */
1347 0xfffff, /* length - all address space */
1348 SDT_MEMRWA, /* segment type */
1349 SEL_UPL, /* segment descriptor priority level */
1350 1, /* segment descriptor present */
1352 1, /* default 32 vs 16 bit size */
1353 1 /* limit granularity (byte/page units)*/ },
1354 /* GCODE_SEL 4 Code Descriptor for kernel */
1355 { 0x0, /* segment base address */
1356 0xfffff, /* length - all address space */
1357 SDT_MEMERA, /* segment type */
1358 0, /* segment descriptor priority level */
1359 1, /* segment descriptor present */
1361 1, /* default 32 vs 16 bit size */
1362 1 /* limit granularity (byte/page units)*/ },
1363 /* GDATA_SEL 5 Data Descriptor for kernel */
1364 { 0x0, /* segment base address */
1365 0xfffff, /* length - all address space */
1366 SDT_MEMRWA, /* segment type */
1367 0, /* segment descriptor priority level */
1368 1, /* segment descriptor present */
1370 1, /* default 32 vs 16 bit size */
1371 1 /* limit granularity (byte/page units)*/ },
1372 /* GUCODE_SEL 6 Code Descriptor for user */
1373 { 0x0, /* segment base address */
1374 0xfffff, /* length - all address space */
1375 SDT_MEMERA, /* segment type */
1376 SEL_UPL, /* segment descriptor priority level */
1377 1, /* segment descriptor present */
1379 1, /* default 32 vs 16 bit size */
1380 1 /* limit granularity (byte/page units)*/ },
1381 /* GUDATA_SEL 7 Data Descriptor for user */
1382 { 0x0, /* segment base address */
1383 0xfffff, /* length - all address space */
1384 SDT_MEMRWA, /* segment type */
1385 SEL_UPL, /* segment descriptor priority level */
1386 1, /* segment descriptor present */
1388 1, /* default 32 vs 16 bit size */
1389 1 /* limit granularity (byte/page units)*/ },
1390 /* GBIOSLOWMEM_SEL 8 BIOS access to realmode segment 0x40, must be #8 in GDT */
1391 { 0x400, /* segment base address */
1392 0xfffff, /* length */
1393 SDT_MEMRWA, /* segment type */
1394 0, /* segment descriptor priority level */
1395 1, /* segment descriptor present */
1397 1, /* default 32 vs 16 bit size */
1398 1 /* limit granularity (byte/page units)*/ },
1399 /* GPROC0_SEL 9 Proc 0 Tss Descriptor */
1401 0x0, /* segment base address */
1402 sizeof(struct i386tss)-1,/* length */
1403 SDT_SYS386TSS, /* segment type */
1404 0, /* segment descriptor priority level */
1405 1, /* segment descriptor present */
1407 0, /* unused - default 32 vs 16 bit size */
1408 0 /* limit granularity (byte/page units)*/ },
1409 /* GLDT_SEL 10 LDT Descriptor */
1410 { (int) ldt, /* segment base address */
1411 sizeof(ldt)-1, /* length - all address space */
1412 SDT_SYSLDT, /* segment type */
1413 SEL_UPL, /* segment descriptor priority level */
1414 1, /* segment descriptor present */
1416 0, /* unused - default 32 vs 16 bit size */
1417 0 /* limit granularity (byte/page units)*/ },
1418 /* GUSERLDT_SEL 11 User LDT Descriptor per process */
1419 { (int) ldt, /* segment base address */
1420 (512 * sizeof(union descriptor)-1), /* length */
1421 SDT_SYSLDT, /* segment type */
1422 0, /* segment descriptor priority level */
1423 1, /* segment descriptor present */
1425 0, /* unused - default 32 vs 16 bit size */
1426 0 /* limit granularity (byte/page units)*/ },
1427 /* GPANIC_SEL 12 Panic Tss Descriptor */
1428 { (int) &dblfault_tss, /* segment base address */
1429 sizeof(struct i386tss)-1,/* length - all address space */
1430 SDT_SYS386TSS, /* segment type */
1431 0, /* segment descriptor priority level */
1432 1, /* segment descriptor present */
1434 0, /* unused - default 32 vs 16 bit size */
1435 0 /* limit granularity (byte/page units)*/ },
1436 /* GBIOSCODE32_SEL 13 BIOS 32-bit interface (32bit Code) */
1437 { 0, /* segment base address (overwritten) */
1438 0xfffff, /* length */
1439 SDT_MEMERA, /* segment type */
1440 0, /* segment descriptor priority level */
1441 1, /* segment descriptor present */
1443 0, /* default 32 vs 16 bit size */
1444 1 /* limit granularity (byte/page units)*/ },
1445 /* GBIOSCODE16_SEL 14 BIOS 32-bit interface (16bit Code) */
1446 { 0, /* segment base address (overwritten) */
1447 0xfffff, /* length */
1448 SDT_MEMERA, /* segment type */
1449 0, /* segment descriptor priority level */
1450 1, /* segment descriptor present */
1452 0, /* default 32 vs 16 bit size */
1453 1 /* limit granularity (byte/page units)*/ },
1454 /* GBIOSDATA_SEL 15 BIOS 32-bit interface (Data) */
1455 { 0, /* segment base address (overwritten) */
1456 0xfffff, /* length */
1457 SDT_MEMRWA, /* segment type */
1458 0, /* segment descriptor priority level */
1459 1, /* segment descriptor present */
1461 1, /* default 32 vs 16 bit size */
1462 1 /* limit granularity (byte/page units)*/ },
1463 /* GBIOSUTIL_SEL 16 BIOS 16-bit interface (Utility) */
1464 { 0, /* segment base address (overwritten) */
1465 0xfffff, /* length */
1466 SDT_MEMRWA, /* segment type */
1467 0, /* segment descriptor priority level */
1468 1, /* segment descriptor present */
1470 0, /* default 32 vs 16 bit size */
1471 1 /* limit granularity (byte/page units)*/ },
1472 /* GBIOSARGS_SEL 17 BIOS 16-bit interface (Arguments) */
1473 { 0, /* segment base address (overwritten) */
1474 0xfffff, /* length */
1475 SDT_MEMRWA, /* segment type */
1476 0, /* segment descriptor priority level */
1477 1, /* segment descriptor present */
1479 0, /* default 32 vs 16 bit size */
1480 1 /* limit granularity (byte/page units)*/ },
1481 /* GNDIS_SEL 18 NDIS Descriptor */
1482 { 0x0, /* segment base address */
1484 0, /* segment type */
1485 0, /* segment descriptor priority level */
1486 0, /* segment descriptor present */
1488 0, /* default 32 vs 16 bit size */
1489 0 /* limit granularity (byte/page units)*/ },
1492 static struct soft_segment_descriptor ldt_segs[] = {
1493 /* Null Descriptor - overwritten by call gate */
1494 { 0x0, /* segment base address */
1495 0x0, /* length - all address space */
1496 0, /* segment type */
1497 0, /* segment descriptor priority level */
1498 0, /* segment descriptor present */
1500 0, /* default 32 vs 16 bit size */
1501 0 /* limit granularity (byte/page units)*/ },
1502 /* Null Descriptor - overwritten by call gate */
1503 { 0x0, /* segment base address */
1504 0x0, /* length - all address space */
1505 0, /* segment type */
1506 0, /* segment descriptor priority level */
1507 0, /* segment descriptor present */
1509 0, /* default 32 vs 16 bit size */
1510 0 /* limit granularity (byte/page units)*/ },
1511 /* Null Descriptor - overwritten by call gate */
1512 { 0x0, /* segment base address */
1513 0x0, /* length - all address space */
1514 0, /* segment type */
1515 0, /* segment descriptor priority level */
1516 0, /* segment descriptor present */
1518 0, /* default 32 vs 16 bit size */
1519 0 /* limit granularity (byte/page units)*/ },
1520 /* Code Descriptor for user */
1521 { 0x0, /* segment base address */
1522 0xfffff, /* length - all address space */
1523 SDT_MEMERA, /* segment type */
1524 SEL_UPL, /* segment descriptor priority level */
1525 1, /* segment descriptor present */
1527 1, /* default 32 vs 16 bit size */
1528 1 /* limit granularity (byte/page units)*/ },
1529 /* Null Descriptor - overwritten by call gate */
1530 { 0x0, /* segment base address */
1531 0x0, /* length - all address space */
1532 0, /* segment type */
1533 0, /* segment descriptor priority level */
1534 0, /* segment descriptor present */
1536 0, /* default 32 vs 16 bit size */
1537 0 /* limit granularity (byte/page units)*/ },
1538 /* Data Descriptor for user */
1539 { 0x0, /* segment base address */
1540 0xfffff, /* length - all address space */
1541 SDT_MEMRWA, /* segment type */
1542 SEL_UPL, /* segment descriptor priority level */
1543 1, /* segment descriptor present */
1545 1, /* default 32 vs 16 bit size */
1546 1 /* limit granularity (byte/page units)*/ },
1550 setidt(idx, func, typ, dpl, selec)
1557 struct gate_descriptor *ip;
1560 ip->gd_looffset = (int)func;
1561 ip->gd_selector = selec;
1567 ip->gd_hioffset = ((int)func)>>16 ;
1570 #define IDTVEC(name) __CONCAT(X,name)
1573 IDTVEC(div), IDTVEC(dbg), IDTVEC(nmi), IDTVEC(bpt), IDTVEC(ofl),
1574 IDTVEC(bnd), IDTVEC(ill), IDTVEC(dna), IDTVEC(fpusegm),
1575 IDTVEC(tss), IDTVEC(missing), IDTVEC(stk), IDTVEC(prot),
1576 IDTVEC(page), IDTVEC(mchk), IDTVEC(rsvd), IDTVEC(fpu), IDTVEC(align),
1577 IDTVEC(xmm), IDTVEC(lcall_syscall), IDTVEC(int0x80_syscall);
1581 * Display the index and function name of any IDT entries that don't use
1582 * the default 'rsvd' entry point.
1584 DB_SHOW_COMMAND(idt, db_show_idt)
1586 struct gate_descriptor *ip;
1591 for (idx = 0; idx < NIDT && !db_pager_quit; idx++) {
1592 func = (ip->gd_hioffset << 16 | ip->gd_looffset);
1593 if (func != (uintptr_t)&IDTVEC(rsvd)) {
1594 db_printf("%3d\t", idx);
1595 db_printsym(func, DB_STGY_PROC);
1605 struct segment_descriptor *sd;
1606 struct soft_segment_descriptor *ssd;
1608 ssd->ssd_base = (sd->sd_hibase << 24) | sd->sd_lobase;
1609 ssd->ssd_limit = (sd->sd_hilimit << 16) | sd->sd_lolimit;
1610 ssd->ssd_type = sd->sd_type;
1611 ssd->ssd_dpl = sd->sd_dpl;
1612 ssd->ssd_p = sd->sd_p;
1613 ssd->ssd_def32 = sd->sd_def32;
1614 ssd->ssd_gran = sd->sd_gran;
1617 #define PHYSMAP_SIZE (2 * 8)
1620 * Populate the (physmap) array with base/bound pairs describing the
1621 * available physical memory in the system, then test this memory and
1622 * build the phys_avail array describing the actually-available memory.
1624 * If we cannot accurately determine the physical memory map, then use
1625 * value from the 0xE801 call, and failing that, the RTC.
1627 * Total memory size may be set by the kernel environment variable
1628 * hw.physmem or the compile-time define MAXMEM.
1630 * XXX first should be vm_paddr_t.
1633 getmemsize(int first)
1635 int i, physmap_idx, pa_indx, da_indx;
1636 int hasbrokenint12, has_smap;
1637 u_long physmem_tunable;
1639 struct vm86frame vmf;
1640 struct vm86context vmc;
1641 vm_paddr_t pa, physmap[PHYSMAP_SIZE];
1643 struct bios_smap *smap;
1644 quad_t dcons_addr, dcons_size;
1648 if (arch_i386_is_xbox) {
1650 * We queried the memory size before, so chop off 4MB for
1651 * the framebuffer and inform the OS of this.
1654 physmap[1] = (arch_i386_xbox_memsize * 1024 * 1024) - XBOX_FB_SIZE;
1661 TUNABLE_INT_FETCH("hw.hasbrokenint12", &hasbrokenint12);
1662 bzero(&vmf, sizeof(vmf));
1663 bzero(physmap, sizeof(physmap));
1667 * Some newer BIOSes has broken INT 12H implementation which cause
1668 * kernel panic immediately. In this case, we need to scan SMAP
1669 * with INT 15:E820 first, then determine base memory size.
1671 if (hasbrokenint12) {
1676 * Perform "base memory" related probes & setup
1678 vm86_intcall(0x12, &vmf);
1679 basemem = vmf.vmf_ax;
1680 if (basemem > 640) {
1681 printf("Preposterous BIOS basemem of %uK, truncating to 640K\n",
1687 * XXX if biosbasemem is now < 640, there is a `hole'
1688 * between the end of base memory and the start of
1689 * ISA memory. The hole may be empty or it may
1690 * contain BIOS code or data. Map it read/write so
1691 * that the BIOS can write to it. (Memory from 0 to
1692 * the physical end of the kernel is mapped read-only
1693 * to begin with and then parts of it are remapped.
1694 * The parts that aren't remapped form holes that
1695 * remain read-only and are unused by the kernel.
1696 * The base memory area is below the physical end of
1697 * the kernel and right now forms a read-only hole.
1698 * The part of it from PAGE_SIZE to
1699 * (trunc_page(biosbasemem * 1024) - 1) will be
1700 * remapped and used by the kernel later.)
1702 * This code is similar to the code used in
1703 * pmap_mapdev, but since no memory needs to be
1704 * allocated we simply change the mapping.
1706 for (pa = trunc_page(basemem * 1024);
1707 pa < ISA_HOLE_START; pa += PAGE_SIZE)
1708 pmap_kenter(KERNBASE + pa, pa);
1711 * Map pages between basemem and ISA_HOLE_START, if any, r/w into
1712 * the vm86 page table so that vm86 can scribble on them using
1713 * the vm86 map too. XXX: why 2 ways for this and only 1 way for
1714 * page 0, at least as initialized here?
1716 pte = (pt_entry_t *)vm86paddr;
1717 for (i = basemem / 4; i < 160; i++)
1718 pte[i] = (i << PAGE_SHIFT) | PG_V | PG_RW | PG_U;
1722 * map page 1 R/W into the kernel page table so we can use it
1723 * as a buffer. The kernel will unmap this page later.
1725 pmap_kenter(KERNBASE + (1 << PAGE_SHIFT), 1 << PAGE_SHIFT);
1728 * get memory map with INT 15:E820
1731 smap = (void *)vm86_addpage(&vmc, 1, KERNBASE + (1 << PAGE_SHIFT));
1732 vm86_getptr(&vmc, (vm_offset_t)smap, &vmf.vmf_es, &vmf.vmf_di);
1737 vmf.vmf_eax = 0xE820;
1738 vmf.vmf_edx = SMAP_SIG;
1739 vmf.vmf_ecx = sizeof(struct bios_smap);
1740 i = vm86_datacall(0x15, &vmf, &vmc);
1741 if (i || vmf.vmf_eax != SMAP_SIG)
1743 if (boothowto & RB_VERBOSE)
1744 printf("SMAP type=%02x base=%016llx len=%016llx\n",
1745 smap->type, smap->base, smap->length);
1748 if (smap->type != 0x01)
1751 if (smap->length == 0)
1755 if (smap->base >= 0xffffffff) {
1756 printf("%uK of memory above 4GB ignored\n",
1757 (u_int)(smap->length / 1024));
1762 for (i = 0; i <= physmap_idx; i += 2) {
1763 if (smap->base < physmap[i + 1]) {
1764 if (boothowto & RB_VERBOSE)
1766 "Overlapping or non-montonic memory region, ignoring second region\n");
1771 if (smap->base == physmap[physmap_idx + 1]) {
1772 physmap[physmap_idx + 1] += smap->length;
1777 if (physmap_idx == PHYSMAP_SIZE) {
1779 "Too many segments in the physical address map, giving up\n");
1782 physmap[physmap_idx] = smap->base;
1783 physmap[physmap_idx + 1] = smap->base + smap->length;
1784 } while (vmf.vmf_ebx != 0);
1787 * Perform "base memory" related probes & setup based on SMAP
1790 for (i = 0; i <= physmap_idx; i += 2) {
1791 if (physmap[i] == 0x00000000) {
1792 basemem = physmap[i + 1] / 1024;
1798 * XXX this function is horribly organized and has to the same
1799 * things that it does above here.
1803 if (basemem > 640) {
1805 "Preposterous BIOS basemem of %uK, truncating to 640K\n",
1811 * Let vm86 scribble on pages between basemem and
1812 * ISA_HOLE_START, as above.
1814 for (pa = trunc_page(basemem * 1024);
1815 pa < ISA_HOLE_START; pa += PAGE_SIZE)
1816 pmap_kenter(KERNBASE + pa, pa);
1817 pte = (pt_entry_t *)vm86paddr;
1818 for (i = basemem / 4; i < 160; i++)
1819 pte[i] = (i << PAGE_SHIFT) | PG_V | PG_RW | PG_U;
1822 if (physmap[1] != 0)
1826 * If we failed above, try memory map with INT 15:E801
1828 vmf.vmf_ax = 0xE801;
1829 if (vm86_intcall(0x15, &vmf) == 0) {
1830 extmem = vmf.vmf_cx + vmf.vmf_dx * 64;
1834 vm86_intcall(0x15, &vmf);
1835 extmem = vmf.vmf_ax;
1838 * Prefer the RTC value for extended memory.
1840 extmem = rtcin(RTC_EXTLO) + (rtcin(RTC_EXTHI) << 8);
1845 * Special hack for chipsets that still remap the 384k hole when
1846 * there's 16MB of memory - this really confuses people that
1847 * are trying to use bus mastering ISA controllers with the
1848 * "16MB limit"; they only have 16MB, but the remapping puts
1849 * them beyond the limit.
1851 * If extended memory is between 15-16MB (16-17MB phys address range),
1854 if ((extmem > 15 * 1024) && (extmem < 16 * 1024))
1858 physmap[1] = basemem * 1024;
1860 physmap[physmap_idx] = 0x100000;
1861 physmap[physmap_idx + 1] = physmap[physmap_idx] + extmem * 1024;
1865 * Now, physmap contains a map of physical memory.
1869 /* make hole for AP bootstrap code */
1870 physmap[1] = mp_bootaddress(physmap[1]);
1874 * Maxmem isn't the "maximum memory", it's one larger than the
1875 * highest page of the physical address space. It should be
1876 * called something like "Maxphyspage". We may adjust this
1877 * based on ``hw.physmem'' and the results of the memory test.
1879 Maxmem = atop(physmap[physmap_idx + 1]);
1882 Maxmem = MAXMEM / 4;
1885 if (TUNABLE_ULONG_FETCH("hw.physmem", &physmem_tunable))
1886 Maxmem = atop(physmem_tunable);
1889 * If we have an SMAP, don't allow MAXMEM or hw.physmem to extend
1890 * the amount of memory in the system.
1892 if (has_smap && Maxmem > atop(physmap[physmap_idx + 1]))
1893 Maxmem = atop(physmap[physmap_idx + 1]);
1895 if (atop(physmap[physmap_idx + 1]) != Maxmem &&
1896 (boothowto & RB_VERBOSE))
1897 printf("Physical memory use set to %ldK\n", Maxmem * 4);
1900 * If Maxmem has been increased beyond what the system has detected,
1901 * extend the last memory segment to the new limit.
1903 if (atop(physmap[physmap_idx + 1]) < Maxmem)
1904 physmap[physmap_idx + 1] = ptoa((vm_paddr_t)Maxmem);
1906 /* call pmap initialization to make new kernel address space */
1907 pmap_bootstrap(first, 0);
1910 * Size up each available chunk of physical memory.
1912 physmap[0] = PAGE_SIZE; /* mask off page 0 */
1915 phys_avail[pa_indx++] = physmap[0];
1916 phys_avail[pa_indx] = physmap[0];
1917 dump_avail[da_indx] = physmap[0];
1921 * Get dcons buffer address
1923 if (getenv_quad("dcons.addr", &dcons_addr) == 0 ||
1924 getenv_quad("dcons.size", &dcons_size) == 0)
1928 * physmap is in bytes, so when converting to page boundaries,
1929 * round up the start address and round down the end address.
1931 for (i = 0; i <= physmap_idx; i += 2) {
1934 end = ptoa((vm_paddr_t)Maxmem);
1935 if (physmap[i + 1] < end)
1936 end = trunc_page(physmap[i + 1]);
1937 for (pa = round_page(physmap[i]); pa < end; pa += PAGE_SIZE) {
1938 int tmp, page_bad, full;
1939 int *ptr = (int *)CADDR1;
1943 * block out kernel memory as not available.
1945 if (pa >= KERNLOAD && pa < first)
1949 * block out dcons buffer
1952 && pa >= trunc_page(dcons_addr)
1953 && pa < dcons_addr + dcons_size)
1959 * map page into kernel: valid, read/write,non-cacheable
1961 *pte = pa | PG_V | PG_RW | PG_N;
1966 * Test for alternating 1's and 0's
1968 *(volatile int *)ptr = 0xaaaaaaaa;
1969 if (*(volatile int *)ptr != 0xaaaaaaaa)
1972 * Test for alternating 0's and 1's
1974 *(volatile int *)ptr = 0x55555555;
1975 if (*(volatile int *)ptr != 0x55555555)
1980 *(volatile int *)ptr = 0xffffffff;
1981 if (*(volatile int *)ptr != 0xffffffff)
1986 *(volatile int *)ptr = 0x0;
1987 if (*(volatile int *)ptr != 0x0)
1990 * Restore original value.
1995 * Adjust array of valid/good pages.
1997 if (page_bad == TRUE)
2000 * If this good page is a continuation of the
2001 * previous set of good pages, then just increase
2002 * the end pointer. Otherwise start a new chunk.
2003 * Note that "end" points one higher than end,
2004 * making the range >= start and < end.
2005 * If we're also doing a speculative memory
2006 * test and we at or past the end, bump up Maxmem
2007 * so that we keep going. The first bad page
2008 * will terminate the loop.
2010 if (phys_avail[pa_indx] == pa) {
2011 phys_avail[pa_indx] += PAGE_SIZE;
2014 if (pa_indx == PHYS_AVAIL_ARRAY_END) {
2016 "Too many holes in the physical address space, giving up\n");
2021 phys_avail[pa_indx++] = pa; /* start */
2022 phys_avail[pa_indx] = pa + PAGE_SIZE; /* end */
2026 if (dump_avail[da_indx] == pa) {
2027 dump_avail[da_indx] += PAGE_SIZE;
2030 if (da_indx == DUMP_AVAIL_ARRAY_END) {
2034 dump_avail[da_indx++] = pa; /* start */
2035 dump_avail[da_indx] = pa + PAGE_SIZE; /* end */
2047 * The last chunk must contain at least one page plus the message
2048 * buffer to avoid complicating other code (message buffer address
2049 * calculation, etc.).
2051 while (phys_avail[pa_indx - 1] + PAGE_SIZE +
2052 round_page(MSGBUF_SIZE) >= phys_avail[pa_indx]) {
2053 physmem -= atop(phys_avail[pa_indx] - phys_avail[pa_indx - 1]);
2054 phys_avail[pa_indx--] = 0;
2055 phys_avail[pa_indx--] = 0;
2058 Maxmem = atop(phys_avail[pa_indx]);
2060 /* Trim off space for the message buffer. */
2061 phys_avail[pa_indx] -= round_page(MSGBUF_SIZE);
2063 avail_end = phys_avail[pa_indx];
2070 struct gate_descriptor *gdp;
2071 int gsel_tss, metadata_missing, off, x;
2074 thread0.td_kstack = proc0kstack;
2075 thread0.td_pcb = (struct pcb *)
2076 (thread0.td_kstack + KSTACK_PAGES * PAGE_SIZE) - 1;
2079 * This may be done better later if it gets more high level
2080 * components in it. If so just link td->td_proc here.
2082 proc_linkup(&proc0, &ksegrp0, &thread0);
2084 metadata_missing = 0;
2085 if (bootinfo.bi_modulep) {
2086 preload_metadata = (caddr_t)bootinfo.bi_modulep + KERNBASE;
2087 preload_bootstrap_relocate(KERNBASE);
2089 metadata_missing = 1;
2092 kern_envp = static_env;
2093 else if (bootinfo.bi_envp)
2094 kern_envp = (caddr_t)bootinfo.bi_envp + KERNBASE;
2096 /* Init basic tunables, hz etc */
2100 * Make gdt memory segments. All segments cover the full 4GB
2101 * of address space and permissions are enforced at page level.
2103 gdt_segs[GCODE_SEL].ssd_limit = atop(0 - 1);
2104 gdt_segs[GDATA_SEL].ssd_limit = atop(0 - 1);
2105 gdt_segs[GUCODE_SEL].ssd_limit = atop(0 - 1);
2106 gdt_segs[GUDATA_SEL].ssd_limit = atop(0 - 1);
2107 gdt_segs[GUFS_SEL].ssd_limit = atop(0 - 1);
2108 gdt_segs[GUGS_SEL].ssd_limit = atop(0 - 1);
2111 pc = &SMP_prvspace[0].pcpu;
2115 gdt_segs[GPRIV_SEL].ssd_limit = atop(0 - 1);
2116 gdt_segs[GPRIV_SEL].ssd_base = (int) pc;
2117 gdt_segs[GPROC0_SEL].ssd_base = (int) &pc->pc_common_tss;
2119 for (x = 0; x < NGDT; x++)
2120 ssdtosd(&gdt_segs[x], &gdt[x].sd);
2122 r_gdt.rd_limit = NGDT * sizeof(gdt[0]) - 1;
2123 r_gdt.rd_base = (int) gdt;
2126 pcpu_init(pc, 0, sizeof(struct pcpu));
2127 PCPU_SET(prvspace, pc);
2128 PCPU_SET(curthread, &thread0);
2129 PCPU_SET(curpcb, thread0.td_pcb);
2132 * Initialize mutexes.
2134 * icu_lock: in order to allow an interrupt to occur in a critical
2135 * section, to set pcpu->ipending (etc...) properly, we
2136 * must be able to get the icu lock, so it can't be
2140 mtx_init(&clock_lock, "clk", NULL, MTX_SPIN);
2141 mtx_init(&icu_lock, "icu", NULL, MTX_SPIN | MTX_NOWITNESS);
2143 /* make ldt memory segments */
2144 ldt_segs[LUCODE_SEL].ssd_limit = atop(0 - 1);
2145 ldt_segs[LUDATA_SEL].ssd_limit = atop(0 - 1);
2146 for (x = 0; x < sizeof ldt_segs / sizeof ldt_segs[0]; x++)
2147 ssdtosd(&ldt_segs[x], &ldt[x].sd);
2149 _default_ldt = GSEL(GLDT_SEL, SEL_KPL);
2151 PCPU_SET(currentldt, _default_ldt);
2154 for (x = 0; x < NIDT; x++)
2155 setidt(x, &IDTVEC(rsvd), SDT_SYS386TGT, SEL_KPL,
2156 GSEL(GCODE_SEL, SEL_KPL));
2157 setidt(IDT_DE, &IDTVEC(div), SDT_SYS386TGT, SEL_KPL,
2158 GSEL(GCODE_SEL, SEL_KPL));
2159 setidt(IDT_DB, &IDTVEC(dbg), SDT_SYS386IGT, SEL_KPL,
2160 GSEL(GCODE_SEL, SEL_KPL));
2161 setidt(IDT_NMI, &IDTVEC(nmi), SDT_SYS386IGT, SEL_KPL,
2162 GSEL(GCODE_SEL, SEL_KPL));
2163 setidt(IDT_BP, &IDTVEC(bpt), SDT_SYS386IGT, SEL_UPL,
2164 GSEL(GCODE_SEL, SEL_KPL));
2165 setidt(IDT_OF, &IDTVEC(ofl), SDT_SYS386TGT, SEL_UPL,
2166 GSEL(GCODE_SEL, SEL_KPL));
2167 setidt(IDT_BR, &IDTVEC(bnd), SDT_SYS386TGT, SEL_KPL,
2168 GSEL(GCODE_SEL, SEL_KPL));
2169 setidt(IDT_UD, &IDTVEC(ill), SDT_SYS386TGT, SEL_KPL,
2170 GSEL(GCODE_SEL, SEL_KPL));
2171 setidt(IDT_NM, &IDTVEC(dna), SDT_SYS386TGT, SEL_KPL
2172 , GSEL(GCODE_SEL, SEL_KPL));
2173 setidt(IDT_DF, 0, SDT_SYSTASKGT, SEL_KPL, GSEL(GPANIC_SEL, SEL_KPL));
2174 setidt(IDT_FPUGP, &IDTVEC(fpusegm), SDT_SYS386TGT, SEL_KPL,
2175 GSEL(GCODE_SEL, SEL_KPL));
2176 setidt(IDT_TS, &IDTVEC(tss), SDT_SYS386TGT, SEL_KPL,
2177 GSEL(GCODE_SEL, SEL_KPL));
2178 setidt(IDT_NP, &IDTVEC(missing), SDT_SYS386TGT, SEL_KPL,
2179 GSEL(GCODE_SEL, SEL_KPL));
2180 setidt(IDT_SS, &IDTVEC(stk), SDT_SYS386TGT, SEL_KPL,
2181 GSEL(GCODE_SEL, SEL_KPL));
2182 setidt(IDT_GP, &IDTVEC(prot), SDT_SYS386TGT, SEL_KPL,
2183 GSEL(GCODE_SEL, SEL_KPL));
2184 setidt(IDT_PF, &IDTVEC(page), SDT_SYS386IGT, SEL_KPL,
2185 GSEL(GCODE_SEL, SEL_KPL));
2186 setidt(IDT_MF, &IDTVEC(fpu), SDT_SYS386TGT, SEL_KPL,
2187 GSEL(GCODE_SEL, SEL_KPL));
2188 setidt(IDT_AC, &IDTVEC(align), SDT_SYS386TGT, SEL_KPL,
2189 GSEL(GCODE_SEL, SEL_KPL));
2190 setidt(IDT_MC, &IDTVEC(mchk), SDT_SYS386TGT, SEL_KPL,
2191 GSEL(GCODE_SEL, SEL_KPL));
2192 setidt(IDT_XF, &IDTVEC(xmm), SDT_SYS386TGT, SEL_KPL,
2193 GSEL(GCODE_SEL, SEL_KPL));
2194 setidt(IDT_SYSCALL, &IDTVEC(int0x80_syscall), SDT_SYS386TGT, SEL_UPL,
2195 GSEL(GCODE_SEL, SEL_KPL));
2197 r_idt.rd_limit = sizeof(idt0) - 1;
2198 r_idt.rd_base = (int) idt;
2203 * The following code queries the PCI ID of 0:0:0. For the XBOX,
2204 * This should be 0x10de / 0x02a5.
2206 * This is exactly what Linux does.
2208 outl(0xcf8, 0x80000000);
2209 if (inl(0xcfc) == 0x02a510de) {
2210 arch_i386_is_xbox = 1;
2211 pic16l_setled(XBOX_LED_GREEN);
2214 * We are an XBOX, but we may have either 64MB or 128MB of
2215 * memory. The PCI host bridge should be programmed for this,
2216 * so we just query it.
2218 outl(0xcf8, 0x80000084);
2219 arch_i386_xbox_memsize = (inl(0xcfc) == 0x7FFFFFF) ? 128 : 64;
2224 * Initialize the console before we print anything out.
2228 if (metadata_missing)
2229 printf("WARNING: loader(8) metadata is missing!\n");
2237 ksym_start = bootinfo.bi_symtab;
2238 ksym_end = bootinfo.bi_esymtab;
2244 if (boothowto & RB_KDB)
2245 kdb_enter("Boot flags requested debugger");
2248 finishidentcpu(); /* Final stage of CPU initialization */
2249 setidt(IDT_UD, &IDTVEC(ill), SDT_SYS386TGT, SEL_KPL,
2250 GSEL(GCODE_SEL, SEL_KPL));
2251 setidt(IDT_GP, &IDTVEC(prot), SDT_SYS386TGT, SEL_KPL,
2252 GSEL(GCODE_SEL, SEL_KPL));
2253 initializecpu(); /* Initialize CPU registers */
2255 /* make an initial tss so cpu can get interrupt stack on syscall! */
2256 /* Note: -16 is so we can grow the trapframe if we came from vm86 */
2257 PCPU_SET(common_tss.tss_esp0, thread0.td_kstack +
2258 KSTACK_PAGES * PAGE_SIZE - sizeof(struct pcb) - 16);
2259 PCPU_SET(common_tss.tss_ss0, GSEL(GDATA_SEL, SEL_KPL));
2260 gsel_tss = GSEL(GPROC0_SEL, SEL_KPL);
2261 PCPU_SET(tss_gdt, &gdt[GPROC0_SEL].sd);
2262 PCPU_SET(common_tssd, *PCPU_GET(tss_gdt));
2263 PCPU_SET(common_tss.tss_ioopt, (sizeof (struct i386tss)) << 16);
2266 /* pointer to selector slot for %fs/%gs */
2267 PCPU_SET(fsgs_gdt, &gdt[GUFS_SEL].sd);
2269 dblfault_tss.tss_esp = dblfault_tss.tss_esp0 = dblfault_tss.tss_esp1 =
2270 dblfault_tss.tss_esp2 = (int)&dblfault_stack[sizeof(dblfault_stack)];
2271 dblfault_tss.tss_ss = dblfault_tss.tss_ss0 = dblfault_tss.tss_ss1 =
2272 dblfault_tss.tss_ss2 = GSEL(GDATA_SEL, SEL_KPL);
2274 dblfault_tss.tss_cr3 = (int)IdlePDPT;
2276 dblfault_tss.tss_cr3 = (int)IdlePTD;
2278 dblfault_tss.tss_eip = (int)dblfault_handler;
2279 dblfault_tss.tss_eflags = PSL_KERNEL;
2280 dblfault_tss.tss_ds = dblfault_tss.tss_es =
2281 dblfault_tss.tss_gs = GSEL(GDATA_SEL, SEL_KPL);
2282 dblfault_tss.tss_fs = GSEL(GPRIV_SEL, SEL_KPL);
2283 dblfault_tss.tss_cs = GSEL(GCODE_SEL, SEL_KPL);
2284 dblfault_tss.tss_ldt = GSEL(GLDT_SEL, SEL_KPL);
2288 init_param2(physmem);
2290 /* now running on new page tables, configured,and u/iom is accessible */
2292 /* Map the message buffer. */
2293 for (off = 0; off < round_page(MSGBUF_SIZE); off += PAGE_SIZE)
2294 pmap_kenter((vm_offset_t)msgbufp + off, avail_end + off);
2296 msgbufinit(msgbufp, MSGBUF_SIZE);
2298 /* make a call gate to reenter kernel with */
2299 gdp = &ldt[LSYS5CALLS_SEL].gd;
2301 x = (int) &IDTVEC(lcall_syscall);
2302 gdp->gd_looffset = x;
2303 gdp->gd_selector = GSEL(GCODE_SEL,SEL_KPL);
2305 gdp->gd_type = SDT_SYS386CGT;
2306 gdp->gd_dpl = SEL_UPL;
2308 gdp->gd_hioffset = x >> 16;
2310 /* XXX does this work? */
2312 ldt[LBSDICALLS_SEL] = ldt[LSYS5CALLS_SEL];
2313 ldt[LSOL26CALLS_SEL] = ldt[LSYS5CALLS_SEL];
2315 /* transfer to user mode */
2317 _ucodesel = GSEL(GUCODE_SEL, SEL_UPL);
2318 _udatasel = GSEL(GUDATA_SEL, SEL_UPL);
2320 /* setup proc 0's pcb */
2321 thread0.td_pcb->pcb_flags = 0; /* XXXKSE */
2323 thread0.td_pcb->pcb_cr3 = (int)IdlePDPT;
2325 thread0.td_pcb->pcb_cr3 = (int)IdlePTD;
2327 thread0.td_pcb->pcb_ext = 0;
2328 thread0.td_frame = &proc0_tf;
2332 cpu_pcpu_init(struct pcpu *pcpu, int cpuid, size_t size)
2335 pcpu->pc_acpi_id = 0xffffffff;
2339 spinlock_enter(void)
2344 if (td->td_md.md_spinlock_count == 0)
2345 td->td_md.md_saved_flags = intr_disable();
2346 td->td_md.md_spinlock_count++;
2357 td->td_md.md_spinlock_count--;
2358 if (td->td_md.md_spinlock_count == 0)
2359 intr_restore(td->td_md.md_saved_flags);
2362 #if defined(I586_CPU) && !defined(NO_F00F_HACK)
2363 static void f00f_hack(void *unused);
2364 SYSINIT(f00f_hack, SI_SUB_INTRINSIC, SI_ORDER_FIRST, f00f_hack, NULL)
2367 f00f_hack(void *unused)
2369 struct gate_descriptor *new_idt;
2377 printf("Intel Pentium detected, installing workaround for F00F bug\n");
2379 tmp = kmem_alloc(kernel_map, PAGE_SIZE * 2);
2381 panic("kmem_alloc returned 0");
2383 /* Put the problematic entry (#6) at the end of the lower page. */
2384 new_idt = (struct gate_descriptor*)
2385 (tmp + PAGE_SIZE - 7 * sizeof(struct gate_descriptor));
2386 bcopy(idt, new_idt, sizeof(idt0));
2387 r_idt.rd_base = (u_int)new_idt;
2390 if (vm_map_protect(kernel_map, tmp, tmp + PAGE_SIZE,
2391 VM_PROT_READ, FALSE) != KERN_SUCCESS)
2392 panic("vm_map_protect failed");
2394 #endif /* defined(I586_CPU) && !NO_F00F_HACK */
2397 * Construct a PCB from a trapframe. This is called from kdb_trap() where
2398 * we want to start a backtrace from the function that caused us to enter
2399 * the debugger. We have the context in the trapframe, but base the trace
2400 * on the PCB. The PCB doesn't have to be perfect, as long as it contains
2401 * enough for a backtrace.
2404 makectx(struct trapframe *tf, struct pcb *pcb)
2407 pcb->pcb_edi = tf->tf_edi;
2408 pcb->pcb_esi = tf->tf_esi;
2409 pcb->pcb_ebp = tf->tf_ebp;
2410 pcb->pcb_ebx = tf->tf_ebx;
2411 pcb->pcb_eip = tf->tf_eip;
2412 pcb->pcb_esp = (ISPL(tf->tf_cs)) ? tf->tf_esp : (int)(tf + 1) - 8;
2416 ptrace_set_pc(struct thread *td, u_long addr)
2419 td->td_frame->tf_eip = addr;
2424 ptrace_single_step(struct thread *td)
2426 td->td_frame->tf_eflags |= PSL_T;
2431 ptrace_clear_single_step(struct thread *td)
2433 td->td_frame->tf_eflags &= ~PSL_T;
2438 fill_regs(struct thread *td, struct reg *regs)
2441 struct trapframe *tp;
2445 regs->r_fs = tp->tf_fs;
2446 regs->r_es = tp->tf_es;
2447 regs->r_ds = tp->tf_ds;
2448 regs->r_edi = tp->tf_edi;
2449 regs->r_esi = tp->tf_esi;
2450 regs->r_ebp = tp->tf_ebp;
2451 regs->r_ebx = tp->tf_ebx;
2452 regs->r_edx = tp->tf_edx;
2453 regs->r_ecx = tp->tf_ecx;
2454 regs->r_eax = tp->tf_eax;
2455 regs->r_eip = tp->tf_eip;
2456 regs->r_cs = tp->tf_cs;
2457 regs->r_eflags = tp->tf_eflags;
2458 regs->r_esp = tp->tf_esp;
2459 regs->r_ss = tp->tf_ss;
2460 regs->r_gs = pcb->pcb_gs;
2465 set_regs(struct thread *td, struct reg *regs)
2468 struct trapframe *tp;
2471 if (!EFL_SECURE(regs->r_eflags, tp->tf_eflags) ||
2472 !CS_SECURE(regs->r_cs))
2475 tp->tf_fs = regs->r_fs;
2476 tp->tf_es = regs->r_es;
2477 tp->tf_ds = regs->r_ds;
2478 tp->tf_edi = regs->r_edi;
2479 tp->tf_esi = regs->r_esi;
2480 tp->tf_ebp = regs->r_ebp;
2481 tp->tf_ebx = regs->r_ebx;
2482 tp->tf_edx = regs->r_edx;
2483 tp->tf_ecx = regs->r_ecx;
2484 tp->tf_eax = regs->r_eax;
2485 tp->tf_eip = regs->r_eip;
2486 tp->tf_cs = regs->r_cs;
2487 tp->tf_eflags = regs->r_eflags;
2488 tp->tf_esp = regs->r_esp;
2489 tp->tf_ss = regs->r_ss;
2490 pcb->pcb_gs = regs->r_gs;
2494 #ifdef CPU_ENABLE_SSE
2496 fill_fpregs_xmm(sv_xmm, sv_87)
2497 struct savexmm *sv_xmm;
2498 struct save87 *sv_87;
2500 register struct env87 *penv_87 = &sv_87->sv_env;
2501 register struct envxmm *penv_xmm = &sv_xmm->sv_env;
2504 bzero(sv_87, sizeof(*sv_87));
2506 /* FPU control/status */
2507 penv_87->en_cw = penv_xmm->en_cw;
2508 penv_87->en_sw = penv_xmm->en_sw;
2509 penv_87->en_tw = penv_xmm->en_tw;
2510 penv_87->en_fip = penv_xmm->en_fip;
2511 penv_87->en_fcs = penv_xmm->en_fcs;
2512 penv_87->en_opcode = penv_xmm->en_opcode;
2513 penv_87->en_foo = penv_xmm->en_foo;
2514 penv_87->en_fos = penv_xmm->en_fos;
2517 for (i = 0; i < 8; ++i)
2518 sv_87->sv_ac[i] = sv_xmm->sv_fp[i].fp_acc;
2522 set_fpregs_xmm(sv_87, sv_xmm)
2523 struct save87 *sv_87;
2524 struct savexmm *sv_xmm;
2526 register struct env87 *penv_87 = &sv_87->sv_env;
2527 register struct envxmm *penv_xmm = &sv_xmm->sv_env;
2530 /* FPU control/status */
2531 penv_xmm->en_cw = penv_87->en_cw;
2532 penv_xmm->en_sw = penv_87->en_sw;
2533 penv_xmm->en_tw = penv_87->en_tw;
2534 penv_xmm->en_fip = penv_87->en_fip;
2535 penv_xmm->en_fcs = penv_87->en_fcs;
2536 penv_xmm->en_opcode = penv_87->en_opcode;
2537 penv_xmm->en_foo = penv_87->en_foo;
2538 penv_xmm->en_fos = penv_87->en_fos;
2541 for (i = 0; i < 8; ++i)
2542 sv_xmm->sv_fp[i].fp_acc = sv_87->sv_ac[i];
2544 #endif /* CPU_ENABLE_SSE */
2547 fill_fpregs(struct thread *td, struct fpreg *fpregs)
2549 #ifdef CPU_ENABLE_SSE
2551 fill_fpregs_xmm(&td->td_pcb->pcb_save.sv_xmm,
2552 (struct save87 *)fpregs);
2555 #endif /* CPU_ENABLE_SSE */
2556 bcopy(&td->td_pcb->pcb_save.sv_87, fpregs, sizeof *fpregs);
2561 set_fpregs(struct thread *td, struct fpreg *fpregs)
2563 #ifdef CPU_ENABLE_SSE
2565 set_fpregs_xmm((struct save87 *)fpregs,
2566 &td->td_pcb->pcb_save.sv_xmm);
2569 #endif /* CPU_ENABLE_SSE */
2570 bcopy(fpregs, &td->td_pcb->pcb_save.sv_87, sizeof *fpregs);
2575 * Get machine context.
2578 get_mcontext(struct thread *td, mcontext_t *mcp, int flags)
2580 struct trapframe *tp;
2584 PROC_LOCK(curthread->td_proc);
2585 mcp->mc_onstack = sigonstack(tp->tf_esp);
2586 PROC_UNLOCK(curthread->td_proc);
2587 mcp->mc_gs = td->td_pcb->pcb_gs;
2588 mcp->mc_fs = tp->tf_fs;
2589 mcp->mc_es = tp->tf_es;
2590 mcp->mc_ds = tp->tf_ds;
2591 mcp->mc_edi = tp->tf_edi;
2592 mcp->mc_esi = tp->tf_esi;
2593 mcp->mc_ebp = tp->tf_ebp;
2594 mcp->mc_isp = tp->tf_isp;
2595 mcp->mc_eflags = tp->tf_eflags;
2596 if (flags & GET_MC_CLEAR_RET) {
2599 mcp->mc_eflags &= ~PSL_C;
2601 mcp->mc_eax = tp->tf_eax;
2602 mcp->mc_edx = tp->tf_edx;
2604 mcp->mc_ebx = tp->tf_ebx;
2605 mcp->mc_ecx = tp->tf_ecx;
2606 mcp->mc_eip = tp->tf_eip;
2607 mcp->mc_cs = tp->tf_cs;
2608 mcp->mc_esp = tp->tf_esp;
2609 mcp->mc_ss = tp->tf_ss;
2610 mcp->mc_len = sizeof(*mcp);
2611 get_fpcontext(td, mcp);
2616 * Set machine context.
2618 * However, we don't set any but the user modifiable flags, and we won't
2619 * touch the cs selector.
2622 set_mcontext(struct thread *td, const mcontext_t *mcp)
2624 struct trapframe *tp;
2628 if (mcp->mc_len != sizeof(*mcp))
2630 eflags = (mcp->mc_eflags & PSL_USERCHANGE) |
2631 (tp->tf_eflags & ~PSL_USERCHANGE);
2632 if ((ret = set_fpcontext(td, mcp)) == 0) {
2633 tp->tf_fs = mcp->mc_fs;
2634 tp->tf_es = mcp->mc_es;
2635 tp->tf_ds = mcp->mc_ds;
2636 tp->tf_edi = mcp->mc_edi;
2637 tp->tf_esi = mcp->mc_esi;
2638 tp->tf_ebp = mcp->mc_ebp;
2639 tp->tf_ebx = mcp->mc_ebx;
2640 tp->tf_edx = mcp->mc_edx;
2641 tp->tf_ecx = mcp->mc_ecx;
2642 tp->tf_eax = mcp->mc_eax;
2643 tp->tf_eip = mcp->mc_eip;
2644 tp->tf_eflags = eflags;
2645 tp->tf_esp = mcp->mc_esp;
2646 tp->tf_ss = mcp->mc_ss;
2647 td->td_pcb->pcb_gs = mcp->mc_gs;
2654 get_fpcontext(struct thread *td, mcontext_t *mcp)
2657 mcp->mc_fpformat = _MC_FPFMT_NODEV;
2658 mcp->mc_ownedfp = _MC_FPOWNED_NONE;
2660 union savefpu *addr;
2663 * XXX mc_fpstate might be misaligned, since its declaration is not
2664 * unportabilized using __attribute__((aligned(16))) like the
2665 * declaration of struct savemm, and anyway, alignment doesn't work
2666 * for auto variables since we don't use gcc's pessimal stack
2667 * alignment. Work around this by abusing the spare fields after
2670 * XXX unpessimize most cases by only aligning when fxsave might be
2671 * called, although this requires knowing too much about
2672 * npxgetregs()'s internals.
2674 addr = (union savefpu *)&mcp->mc_fpstate;
2675 if (td == PCPU_GET(fpcurthread) &&
2676 #ifdef CPU_ENABLE_SSE
2679 ((uintptr_t)(void *)addr & 0xF)) {
2681 addr = (void *)((char *)addr + 4);
2682 while ((uintptr_t)(void *)addr & 0xF);
2684 mcp->mc_ownedfp = npxgetregs(td, addr);
2685 if (addr != (union savefpu *)&mcp->mc_fpstate) {
2686 bcopy(addr, &mcp->mc_fpstate, sizeof(mcp->mc_fpstate));
2687 bzero(&mcp->mc_spare2, sizeof(mcp->mc_spare2));
2689 mcp->mc_fpformat = npxformat();
2694 set_fpcontext(struct thread *td, const mcontext_t *mcp)
2696 union savefpu *addr;
2698 if (mcp->mc_fpformat == _MC_FPFMT_NODEV)
2700 else if (mcp->mc_fpformat != _MC_FPFMT_387 &&
2701 mcp->mc_fpformat != _MC_FPFMT_XMM)
2703 else if (mcp->mc_ownedfp == _MC_FPOWNED_NONE)
2704 /* We don't care what state is left in the FPU or PCB. */
2706 else if (mcp->mc_ownedfp == _MC_FPOWNED_FPU ||
2707 mcp->mc_ownedfp == _MC_FPOWNED_PCB) {
2708 /* XXX align as above. */
2709 addr = (union savefpu *)&mcp->mc_fpstate;
2710 if (td == PCPU_GET(fpcurthread) &&
2711 #ifdef CPU_ENABLE_SSE
2714 ((uintptr_t)(void *)addr & 0xF)) {
2716 addr = (void *)((char *)addr + 4);
2717 while ((uintptr_t)(void *)addr & 0xF);
2718 bcopy(&mcp->mc_fpstate, addr, sizeof(mcp->mc_fpstate));
2721 #ifdef CPU_ENABLE_SSE
2723 addr->sv_xmm.sv_env.en_mxcsr &= cpu_mxcsr_mask;
2726 * XXX we violate the dubious requirement that npxsetregs()
2727 * be called with interrupts disabled.
2729 npxsetregs(td, addr);
2732 * Don't bother putting things back where they were in the
2733 * misaligned case, since we know that the caller won't use
2742 fpstate_drop(struct thread *td)
2748 if (PCPU_GET(fpcurthread) == td)
2752 * XXX force a full drop of the npx. The above only drops it if we
2753 * owned it. npxgetregs() has the same bug in the !cpu_fxsr case.
2755 * XXX I don't much like npxgetregs()'s semantics of doing a full
2756 * drop. Dropping only to the pcb matches fnsave's behaviour.
2757 * We only need to drop to !PCB_INITDONE in sendsig(). But
2758 * sendsig() is the only caller of npxgetregs()... perhaps we just
2759 * have too many layers.
2761 curthread->td_pcb->pcb_flags &= ~PCB_NPXINITDONE;
2766 fill_dbregs(struct thread *td, struct dbreg *dbregs)
2771 dbregs->dr[0] = rdr0();
2772 dbregs->dr[1] = rdr1();
2773 dbregs->dr[2] = rdr2();
2774 dbregs->dr[3] = rdr3();
2775 dbregs->dr[4] = rdr4();
2776 dbregs->dr[5] = rdr5();
2777 dbregs->dr[6] = rdr6();
2778 dbregs->dr[7] = rdr7();
2781 dbregs->dr[0] = pcb->pcb_dr0;
2782 dbregs->dr[1] = pcb->pcb_dr1;
2783 dbregs->dr[2] = pcb->pcb_dr2;
2784 dbregs->dr[3] = pcb->pcb_dr3;
2787 dbregs->dr[6] = pcb->pcb_dr6;
2788 dbregs->dr[7] = pcb->pcb_dr7;
2794 set_dbregs(struct thread *td, struct dbreg *dbregs)
2798 u_int32_t mask1, mask2;
2801 load_dr0(dbregs->dr[0]);
2802 load_dr1(dbregs->dr[1]);
2803 load_dr2(dbregs->dr[2]);
2804 load_dr3(dbregs->dr[3]);
2805 load_dr4(dbregs->dr[4]);
2806 load_dr5(dbregs->dr[5]);
2807 load_dr6(dbregs->dr[6]);
2808 load_dr7(dbregs->dr[7]);
2811 * Don't let an illegal value for dr7 get set. Specifically,
2812 * check for undefined settings. Setting these bit patterns
2813 * result in undefined behaviour and can lead to an unexpected
2816 for (i = 0, mask1 = 0x3<<16, mask2 = 0x2<<16; i < 8;
2817 i++, mask1 <<= 2, mask2 <<= 2)
2818 if ((dbregs->dr[7] & mask1) == mask2)
2824 * Don't let a process set a breakpoint that is not within the
2825 * process's address space. If a process could do this, it
2826 * could halt the system by setting a breakpoint in the kernel
2827 * (if ddb was enabled). Thus, we need to check to make sure
2828 * that no breakpoints are being enabled for addresses outside
2829 * process's address space.
2831 * XXX - what about when the watched area of the user's
2832 * address space is written into from within the kernel
2833 * ... wouldn't that still cause a breakpoint to be generated
2834 * from within kernel mode?
2837 if (dbregs->dr[7] & 0x3) {
2838 /* dr0 is enabled */
2839 if (dbregs->dr[0] >= VM_MAXUSER_ADDRESS)
2843 if (dbregs->dr[7] & (0x3<<2)) {
2844 /* dr1 is enabled */
2845 if (dbregs->dr[1] >= VM_MAXUSER_ADDRESS)
2849 if (dbregs->dr[7] & (0x3<<4)) {
2850 /* dr2 is enabled */
2851 if (dbregs->dr[2] >= VM_MAXUSER_ADDRESS)
2855 if (dbregs->dr[7] & (0x3<<6)) {
2856 /* dr3 is enabled */
2857 if (dbregs->dr[3] >= VM_MAXUSER_ADDRESS)
2861 pcb->pcb_dr0 = dbregs->dr[0];
2862 pcb->pcb_dr1 = dbregs->dr[1];
2863 pcb->pcb_dr2 = dbregs->dr[2];
2864 pcb->pcb_dr3 = dbregs->dr[3];
2865 pcb->pcb_dr6 = dbregs->dr[6];
2866 pcb->pcb_dr7 = dbregs->dr[7];
2868 pcb->pcb_flags |= PCB_DBREGS;
2875 * Return > 0 if a hardware breakpoint has been hit, and the
2876 * breakpoint was in user space. Return 0, otherwise.
2879 user_dbreg_trap(void)
2881 u_int32_t dr7, dr6; /* debug registers dr6 and dr7 */
2882 u_int32_t bp; /* breakpoint bits extracted from dr6 */
2883 int nbp; /* number of breakpoints that triggered */
2884 caddr_t addr[4]; /* breakpoint addresses */
2888 if ((dr7 & 0x000000ff) == 0) {
2890 * all GE and LE bits in the dr7 register are zero,
2891 * thus the trap couldn't have been caused by the
2892 * hardware debug registers
2899 bp = dr6 & 0x0000000f;
2903 * None of the breakpoint bits are set meaning this
2904 * trap was not caused by any of the debug registers
2910 * at least one of the breakpoints were hit, check to see
2911 * which ones and if any of them are user space addresses
2915 addr[nbp++] = (caddr_t)rdr0();
2918 addr[nbp++] = (caddr_t)rdr1();
2921 addr[nbp++] = (caddr_t)rdr2();
2924 addr[nbp++] = (caddr_t)rdr3();
2927 for (i=0; i<nbp; i++) {
2929 (caddr_t)VM_MAXUSER_ADDRESS) {
2931 * addr[i] is in user space
2938 * None of the breakpoints are in user space.
2944 #include <machine/apicvar.h>
2947 * Provide stub functions so that the MADT APIC enumerator in the acpi
2948 * kernel module will link against a kernel without 'device apic'.
2950 * XXX - This is a gross hack.
2953 apic_register_enumerator(struct apic_enumerator *enumerator)
2958 ioapic_create(uintptr_t addr, int32_t id, int intbase)
2964 ioapic_disable_pin(void *cookie, u_int pin)
2970 ioapic_get_vector(void *cookie, u_int pin)
2976 ioapic_register(void *cookie)
2981 ioapic_remap_vector(void *cookie, u_int pin, int vector)
2987 ioapic_set_extint(void *cookie, u_int pin)
2993 ioapic_set_nmi(void *cookie, u_int pin)
2999 ioapic_set_polarity(void *cookie, u_int pin, enum intr_polarity pol)
3005 ioapic_set_triggermode(void *cookie, u_int pin, enum intr_trigger trigger)
3011 lapic_create(u_int apic_id, int boot_cpu)
3016 lapic_init(uintptr_t addr)
3021 lapic_set_lvt_mode(u_int apic_id, u_int lvt, u_int32_t mode)
3027 lapic_set_lvt_polarity(u_int apic_id, u_int lvt, enum intr_polarity pol)
3033 lapic_set_lvt_triggermode(u_int apic_id, u_int lvt, enum intr_trigger trigger)
3042 * Provide inb() and outb() as functions. They are normally only
3043 * available as macros calling inlined functions, thus cannot be
3044 * called from the debugger.
3046 * The actual code is stolen from <machine/cpufunc.h>, and de-inlined.
3052 /* silence compiler warnings */
3054 void outb(u_int, u_char);
3061 * We use %%dx and not %1 here because i/o is done at %dx and not at
3062 * %edx, while gcc generates inferior code (movw instead of movl)
3063 * if we tell it to load (u_short) port.
3065 __asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port));
3070 outb(u_int port, u_char data)
3074 * Use an unnecessary assignment to help gcc's register allocator.
3075 * This make a large difference for gcc-1.40 and a tiny difference
3076 * for gcc-2.6.0. For gcc-1.40, al had to be ``asm("ax")'' for
3077 * best results. gcc-2.6.0 can't handle this.
3080 __asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port));