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
38 * $FreeBSD: src/sys/i386/i386/machdep.c,v 1.385.2.30 2003/05/31 08:48:05 alc Exp $
39 * $DragonFly: src/sys/platform/pc32/i386/machdep.c,v 1.65 2004/08/12 19:59:30 eirikn Exp $
43 #include "use_ether.h"
46 #include "opt_atalk.h"
47 #include "opt_compat.h"
50 #include "opt_directio.h"
53 #include "opt_maxmem.h"
54 #include "opt_msgbuf.h"
55 #include "opt_perfmon.h"
57 #include "opt_userconfig.h"
59 #include <sys/param.h>
60 #include <sys/systm.h>
61 #include <sys/sysproto.h>
62 #include <sys/signalvar.h>
63 #include <sys/kernel.h>
64 #include <sys/linker.h>
65 #include <sys/malloc.h>
68 #include <sys/reboot.h>
69 #include <sys/callout.h>
71 #include <sys/msgbuf.h>
72 #include <sys/sysent.h>
73 #include <sys/sysctl.h>
74 #include <sys/vmmeter.h>
76 #include <sys/upcall.h>
79 #include <vm/vm_param.h>
81 #include <vm/vm_kern.h>
82 #include <vm/vm_object.h>
83 #include <vm/vm_page.h>
84 #include <vm/vm_map.h>
85 #include <vm/vm_pager.h>
86 #include <vm/vm_extern.h>
88 #include <sys/thread2.h>
96 #include <machine/cpu.h>
97 #include <machine/reg.h>
98 #include <machine/clock.h>
99 #include <machine/specialreg.h>
100 #include <machine/bootinfo.h>
101 #include <machine/ipl.h>
102 #include <machine/md_var.h>
103 #include <machine/pcb_ext.h> /* pcb.h included via sys/user.h */
104 #include <machine/globaldata.h> /* CPU_prvspace */
106 #include <machine/smp.h>
109 #include <machine/perfmon.h>
111 #include <machine/cputypes.h>
114 #include <bus/isa/i386/isa_device.h>
116 #include <i386/isa/intr_machdep.h>
117 #include <bus/isa/rtc.h>
118 #include <machine/vm86.h>
119 #include <sys/random.h>
120 #include <sys/ptrace.h>
121 #include <machine/sigframe.h>
123 extern void init386 (int first);
124 extern void dblfault_handler (void);
126 extern void printcpuinfo(void); /* XXX header file */
127 extern void finishidentcpu(void);
128 extern void panicifcpuunsupported(void);
129 extern void initializecpu(void);
131 static void cpu_startup (void *);
132 #ifndef CPU_DISABLE_SSE
133 static void set_fpregs_xmm (struct save87 *, struct savexmm *);
134 static void fill_fpregs_xmm (struct savexmm *, struct save87 *);
135 #endif /* CPU_DISABLE_SSE */
137 extern void ffs_rawread_setup(void);
138 #endif /* DIRECTIO */
139 static void init_locks(void);
141 SYSINIT(cpu, SI_SUB_CPU, SI_ORDER_FIRST, cpu_startup, NULL)
143 int _udatasel, _ucodesel;
146 #if defined(SWTCH_OPTIM_STATS)
147 extern int swtch_optim_stats;
148 SYSCTL_INT(_debug, OID_AUTO, swtch_optim_stats,
149 CTLFLAG_RD, &swtch_optim_stats, 0, "");
150 SYSCTL_INT(_debug, OID_AUTO, tlb_flush_count,
151 CTLFLAG_RD, &tlb_flush_count, 0, "");
155 static int ispc98 = 1;
157 static int ispc98 = 0;
159 SYSCTL_INT(_machdep, OID_AUTO, ispc98, CTLFLAG_RD, &ispc98, 0, "");
165 sysctl_hw_physmem(SYSCTL_HANDLER_ARGS)
167 int error = sysctl_handle_int(oidp, 0, ctob(physmem), req);
171 SYSCTL_PROC(_hw, HW_PHYSMEM, physmem, CTLTYPE_INT|CTLFLAG_RD,
172 0, 0, sysctl_hw_physmem, "IU", "");
175 sysctl_hw_usermem(SYSCTL_HANDLER_ARGS)
177 int error = sysctl_handle_int(oidp, 0,
178 ctob(physmem - vmstats.v_wire_count), req);
182 SYSCTL_PROC(_hw, HW_USERMEM, usermem, CTLTYPE_INT|CTLFLAG_RD,
183 0, 0, sysctl_hw_usermem, "IU", "");
186 sysctl_hw_availpages(SYSCTL_HANDLER_ARGS)
188 int error = sysctl_handle_int(oidp, 0,
189 i386_btop(avail_end - avail_start), req);
193 SYSCTL_PROC(_hw, OID_AUTO, availpages, CTLTYPE_INT|CTLFLAG_RD,
194 0, 0, sysctl_hw_availpages, "I", "");
197 sysctl_machdep_msgbuf(SYSCTL_HANDLER_ARGS)
201 /* Unwind the buffer, so that it's linear (possibly starting with
202 * some initial nulls).
204 error=sysctl_handle_opaque(oidp,msgbufp->msg_ptr+msgbufp->msg_bufr,
205 msgbufp->msg_size-msgbufp->msg_bufr,req);
206 if(error) return(error);
207 if(msgbufp->msg_bufr>0) {
208 error=sysctl_handle_opaque(oidp,msgbufp->msg_ptr,
209 msgbufp->msg_bufr,req);
214 SYSCTL_PROC(_machdep, OID_AUTO, msgbuf, CTLTYPE_STRING|CTLFLAG_RD,
215 0, 0, sysctl_machdep_msgbuf, "A","Contents of kernel message buffer");
217 static int msgbuf_clear;
220 sysctl_machdep_msgbuf_clear(SYSCTL_HANDLER_ARGS)
223 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2,
225 if (!error && req->newptr) {
226 /* Clear the buffer and reset write pointer */
227 bzero(msgbufp->msg_ptr,msgbufp->msg_size);
228 msgbufp->msg_bufr=msgbufp->msg_bufx=0;
234 SYSCTL_PROC(_machdep, OID_AUTO, msgbuf_clear, CTLTYPE_INT|CTLFLAG_RW,
235 &msgbuf_clear, 0, sysctl_machdep_msgbuf_clear, "I",
236 "Clear kernel message buffer");
239 vm_paddr_t Maxmem = 0;
242 vm_paddr_t phys_avail[10];
244 /* must be 2 less so 0 0 can signal end of chunks */
245 #define PHYS_AVAIL_ARRAY_END ((sizeof(phys_avail) / sizeof(vm_offset_t)) - 2)
247 static vm_offset_t buffer_sva, buffer_eva;
248 vm_offset_t clean_sva, clean_eva;
249 static vm_offset_t pager_sva, pager_eva;
250 static struct trapframe proc0_tf;
263 if (boothowto & RB_VERBOSE)
267 * Good {morning,afternoon,evening,night}.
269 printf("%s", version);
272 panicifcpuunsupported();
276 printf("real memory = %llu (%lluK bytes)\n", ptoa(Maxmem), ptoa(Maxmem) / 1024);
278 * Display any holes after the first chunk of extended memory.
283 printf("Physical memory chunk(s):\n");
284 for (indx = 0; phys_avail[indx + 1] != 0; indx += 2) {
285 vm_paddr_t size1 = phys_avail[indx + 1] - phys_avail[indx];
287 printf("0x%08llx - 0x%08llx, %llu bytes (%llu pages)\n",
288 phys_avail[indx], phys_avail[indx + 1] - 1, size1,
294 * Calculate callout wheel size
296 for (callwheelsize = 1, callwheelbits = 0;
297 callwheelsize < ncallout;
298 callwheelsize <<= 1, ++callwheelbits)
300 callwheelmask = callwheelsize - 1;
303 * Allocate space for system data structures.
304 * The first available kernel virtual address is in "v".
305 * As pages of kernel virtual memory are allocated, "v" is incremented.
306 * As pages of memory are allocated and cleared,
307 * "firstaddr" is incremented.
308 * An index into the kernel page table corresponding to the
309 * virtual memory address maintained in "v" is kept in "mapaddr".
313 * Make two passes. The first pass calculates how much memory is
314 * needed and allocates it. The second pass assigns virtual
315 * addresses to the various data structures.
319 v = (caddr_t)firstaddr;
321 #define valloc(name, type, num) \
322 (name) = (type *)v; v = (caddr_t)((name)+(num))
323 #define valloclim(name, type, num, lim) \
324 (name) = (type *)v; v = (caddr_t)((lim) = ((name)+(num)))
326 valloc(callout, struct callout, ncallout);
327 valloc(callwheel, struct callout_tailq, callwheelsize);
330 * The nominal buffer size (and minimum KVA allocation) is BKVASIZE.
331 * For the first 64MB of ram nominally allocate sufficient buffers to
332 * cover 1/4 of our ram. Beyond the first 64MB allocate additional
333 * buffers to cover 1/20 of our ram over 64MB. When auto-sizing
334 * the buffer cache we limit the eventual kva reservation to
337 * factor represents the 1/4 x ram conversion.
340 int factor = 4 * BKVASIZE / 1024;
341 int kbytes = physmem * (PAGE_SIZE / 1024);
345 nbuf += min((kbytes - 4096) / factor, 65536 / factor);
347 nbuf += (kbytes - 65536) * 2 / (factor * 5);
348 if (maxbcache && nbuf > maxbcache / BKVASIZE)
349 nbuf = maxbcache / BKVASIZE;
353 * Do not allow the buffer_map to be more then 1/2 the size of the
356 if (nbuf > (kernel_map->max_offset - kernel_map->min_offset) /
358 nbuf = (kernel_map->max_offset - kernel_map->min_offset) /
360 printf("Warning: nbufs capped at %d\n", nbuf);
363 nswbuf = max(min(nbuf/4, 256), 16);
365 if (nswbuf < NSWBUF_MIN)
372 valloc(swbuf, struct buf, nswbuf);
373 valloc(buf, struct buf, nbuf);
377 * End of first pass, size has been calculated so allocate memory
379 if (firstaddr == 0) {
380 size = (vm_size_t)(v - firstaddr);
381 firstaddr = (int)kmem_alloc(kernel_map, round_page(size));
383 panic("startup: no room for tables");
388 * End of second pass, addresses have been assigned
390 if ((vm_size_t)(v - firstaddr) != size)
391 panic("startup: table size inconsistency");
393 clean_map = kmem_suballoc(kernel_map, &clean_sva, &clean_eva,
394 (nbuf*BKVASIZE) + (nswbuf*MAXPHYS) + pager_map_size);
395 buffer_map = kmem_suballoc(clean_map, &buffer_sva, &buffer_eva,
397 buffer_map->system_map = 1;
398 pager_map = kmem_suballoc(clean_map, &pager_sva, &pager_eva,
399 (nswbuf*MAXPHYS) + pager_map_size);
400 pager_map->system_map = 1;
401 exec_map = kmem_suballoc(kernel_map, &minaddr, &maxaddr,
402 (16*(ARG_MAX+(PAGE_SIZE*3))));
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(vmstats.v_free_count),
424 ptoa(vmstats.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 */
443 * Send an interrupt to process.
445 * Stack is set up to allow sigcode stored
446 * at top to call routine, followed by kcall
447 * to sigreturn routine below. After sigreturn
448 * resets the signal mask, the stack, and the
449 * frame pointer, it returns to the user
453 sendsig(catcher, sig, mask, code)
459 struct proc *p = curproc;
460 struct trapframe *regs;
461 struct sigacts *psp = p->p_sigacts;
462 struct sigframe sf, *sfp;
465 regs = p->p_md.md_regs;
466 oonstack = (p->p_sigstk.ss_flags & SS_ONSTACK) ? 1 : 0;
468 /* save user context */
469 bzero(&sf, sizeof(struct sigframe));
470 sf.sf_uc.uc_sigmask = *mask;
471 sf.sf_uc.uc_stack = p->p_sigstk;
472 sf.sf_uc.uc_mcontext.mc_onstack = oonstack;
473 sf.sf_uc.uc_mcontext.mc_gs = rgs();
474 bcopy(regs, &sf.sf_uc.uc_mcontext.mc_fs, sizeof(struct trapframe));
476 /* Allocate and validate space for the signal handler context. */
477 if ((p->p_flag & P_ALTSTACK) != 0 && !oonstack &&
478 SIGISMEMBER(psp->ps_sigonstack, sig)) {
479 sfp = (struct sigframe *)(p->p_sigstk.ss_sp +
480 p->p_sigstk.ss_size - sizeof(struct sigframe));
481 p->p_sigstk.ss_flags |= SS_ONSTACK;
484 sfp = (struct sigframe *)regs->tf_esp - 1;
486 /* Translate the signal is appropriate */
487 if (p->p_sysent->sv_sigtbl) {
488 if (sig <= p->p_sysent->sv_sigsize)
489 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)];
492 /* Build the argument list for the signal handler. */
494 sf.sf_ucontext = (register_t)&sfp->sf_uc;
495 if (SIGISMEMBER(p->p_sigacts->ps_siginfo, sig)) {
496 /* Signal handler installed with SA_SIGINFO. */
497 sf.sf_siginfo = (register_t)&sfp->sf_si;
498 sf.sf_ahu.sf_action = (__siginfohandler_t *)catcher;
500 /* fill siginfo structure */
501 sf.sf_si.si_signo = sig;
502 sf.sf_si.si_code = code;
503 sf.sf_si.si_addr = (void*)regs->tf_err;
506 /* Old FreeBSD-style arguments. */
507 sf.sf_siginfo = code;
508 sf.sf_addr = regs->tf_err;
509 sf.sf_ahu.sf_handler = catcher;
513 * If we're a vm86 process, we want to save the segment registers.
514 * We also change eflags to be our emulated eflags, not the actual
517 if (regs->tf_eflags & PSL_VM) {
518 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs;
519 struct vm86_kernel *vm86 = &p->p_thread->td_pcb->pcb_ext->ext_vm86;
521 sf.sf_uc.uc_mcontext.mc_gs = tf->tf_vm86_gs;
522 sf.sf_uc.uc_mcontext.mc_fs = tf->tf_vm86_fs;
523 sf.sf_uc.uc_mcontext.mc_es = tf->tf_vm86_es;
524 sf.sf_uc.uc_mcontext.mc_ds = tf->tf_vm86_ds;
526 if (vm86->vm86_has_vme == 0)
527 sf.sf_uc.uc_mcontext.mc_eflags =
528 (tf->tf_eflags & ~(PSL_VIF | PSL_VIP)) |
529 (vm86->vm86_eflags & (PSL_VIF | PSL_VIP));
532 * Clear PSL_NT to inhibit T_TSSFLT faults on return from
533 * syscalls made by the signal handler. This just avoids
534 * wasting time for our lazy fixup of such faults. PSL_NT
535 * does nothing in vm86 mode, but vm86 programs can set it
536 * almost legitimately in probes for old cpu types.
538 tf->tf_eflags &= ~(PSL_VM | PSL_NT | PSL_VIF | PSL_VIP);
542 * Copy the sigframe out to the user's stack.
544 if (copyout(&sf, sfp, sizeof(struct sigframe)) != 0) {
546 * Something is wrong with the stack pointer.
547 * ...Kill the process.
552 regs->tf_esp = (int)sfp;
553 regs->tf_eip = PS_STRINGS - *(p->p_sysent->sv_szsigcode);
554 regs->tf_eflags &= ~PSL_T;
555 regs->tf_cs = _ucodesel;
556 regs->tf_ds = _udatasel;
557 regs->tf_es = _udatasel;
558 regs->tf_fs = _udatasel;
559 regs->tf_ss = _udatasel;
563 * sigreturn(ucontext_t *sigcntxp)
565 * System call to cleanup state after a signal
566 * has been taken. Reset signal mask and
567 * stack state from context left by sendsig (above).
568 * Return to previous pc and psl as specified by
569 * context left by sendsig. Check carefully to
570 * make sure that the user has not modified the
571 * state to gain improper privileges.
573 #define EFL_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0)
574 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL)
577 sigreturn(struct sigreturn_args *uap)
579 struct proc *p = curproc;
580 struct trapframe *regs;
586 if (!useracc((caddr_t)ucp, sizeof(ucontext_t), VM_PROT_READ))
589 regs = p->p_md.md_regs;
590 eflags = ucp->uc_mcontext.mc_eflags;
592 if (eflags & PSL_VM) {
593 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs;
594 struct vm86_kernel *vm86;
597 * if pcb_ext == 0 or vm86_inited == 0, the user hasn't
598 * set up the vm86 area, and we can't enter vm86 mode.
600 if (p->p_thread->td_pcb->pcb_ext == 0)
602 vm86 = &p->p_thread->td_pcb->pcb_ext->ext_vm86;
603 if (vm86->vm86_inited == 0)
606 /* go back to user mode if both flags are set */
607 if ((eflags & PSL_VIP) && (eflags & PSL_VIF))
608 trapsignal(p, SIGBUS, 0);
610 if (vm86->vm86_has_vme) {
611 eflags = (tf->tf_eflags & ~VME_USERCHANGE) |
612 (eflags & VME_USERCHANGE) | PSL_VM;
614 vm86->vm86_eflags = eflags; /* save VIF, VIP */
615 eflags = (tf->tf_eflags & ~VM_USERCHANGE) | (eflags & VM_USERCHANGE) | PSL_VM;
617 bcopy(&ucp->uc_mcontext.mc_fs, tf, sizeof(struct trapframe));
618 tf->tf_eflags = eflags;
619 tf->tf_vm86_ds = tf->tf_ds;
620 tf->tf_vm86_es = tf->tf_es;
621 tf->tf_vm86_fs = tf->tf_fs;
622 tf->tf_vm86_gs = ucp->uc_mcontext.mc_gs;
623 tf->tf_ds = _udatasel;
624 tf->tf_es = _udatasel;
625 tf->tf_fs = _udatasel;
628 * Don't allow users to change privileged or reserved flags.
631 * XXX do allow users to change the privileged flag PSL_RF.
632 * The cpu sets PSL_RF in tf_eflags for faults. Debuggers
633 * should sometimes set it there too. tf_eflags is kept in
634 * the signal context during signal handling and there is no
635 * other place to remember it, so the PSL_RF bit may be
636 * corrupted by the signal handler without us knowing.
637 * Corruption of the PSL_RF bit at worst causes one more or
638 * one less debugger trap, so allowing it is fairly harmless.
640 if (!EFL_SECURE(eflags & ~PSL_RF, regs->tf_eflags & ~PSL_RF)) {
641 printf("sigreturn: eflags = 0x%x\n", eflags);
646 * Don't allow users to load a valid privileged %cs. Let the
647 * hardware check for invalid selectors, excess privilege in
648 * other selectors, invalid %eip's and invalid %esp's.
650 cs = ucp->uc_mcontext.mc_cs;
651 if (!CS_SECURE(cs)) {
652 printf("sigreturn: cs = 0x%x\n", cs);
653 trapsignal(p, SIGBUS, T_PROTFLT);
656 bcopy(&ucp->uc_mcontext.mc_fs, regs, sizeof(struct trapframe));
659 if (ucp->uc_mcontext.mc_onstack & 1)
660 p->p_sigstk.ss_flags |= SS_ONSTACK;
662 p->p_sigstk.ss_flags &= ~SS_ONSTACK;
664 p->p_sigmask = ucp->uc_sigmask;
665 SIG_CANTMASK(p->p_sigmask);
670 * Stack frame on entry to function. %eax will contain the function vector,
671 * %ecx will contain the function data. flags, ecx, and eax will have
672 * already been pushed on the stack.
683 sendupcall(struct vmupcall *vu, int morepending)
685 struct proc *p = curproc;
686 struct trapframe *regs;
687 struct upcall upcall;
688 struct upc_frame upc_frame;
692 * Get the upcall data structure
694 if (copyin(p->p_upcall, &upcall, sizeof(upcall)) ||
695 copyin((char *)upcall.upc_uthread + upcall.upc_critoff, &crit_count, sizeof(int))
698 printf("bad upcall address\n");
703 * If the data structure is already marked pending or has a critical
704 * section count, mark the data structure as pending and return
705 * without doing an upcall. vu_pending is left set.
707 if (upcall.upc_pending || crit_count >= vu->vu_pending) {
708 if (upcall.upc_pending < vu->vu_pending) {
709 upcall.upc_pending = vu->vu_pending;
710 copyout(&upcall.upc_pending, &p->p_upcall->upc_pending,
711 sizeof(upcall.upc_pending));
717 * We can run this upcall now, clear vu_pending.
719 * Bump our critical section count and set or clear the
720 * user pending flag depending on whether more upcalls are
721 * pending. The user will be responsible for calling
722 * upc_dispatch(-1) to process remaining upcalls.
725 upcall.upc_pending = morepending;
726 crit_count += TDPRI_CRIT;
727 copyout(&upcall.upc_pending, &p->p_upcall->upc_pending,
728 sizeof(upcall.upc_pending));
729 copyout(&crit_count, (char *)upcall.upc_uthread + upcall.upc_critoff,
733 * Construct a stack frame and issue the upcall
735 regs = p->p_md.md_regs;
736 upc_frame.eax = regs->tf_eax;
737 upc_frame.ecx = regs->tf_ecx;
738 upc_frame.edx = regs->tf_edx;
739 upc_frame.flags = regs->tf_eflags;
740 upc_frame.oldip = regs->tf_eip;
741 if (copyout(&upc_frame, (void *)(regs->tf_esp - sizeof(upc_frame)),
742 sizeof(upc_frame)) != 0) {
743 printf("bad stack on upcall\n");
745 regs->tf_eax = (register_t)vu->vu_func;
746 regs->tf_ecx = (register_t)vu->vu_data;
747 regs->tf_edx = (register_t)p->p_upcall;
748 regs->tf_eip = (register_t)vu->vu_ctx;
749 regs->tf_esp -= sizeof(upc_frame);
754 * fetchupcall occurs in the context of a system call, which means that
755 * we have to return EJUSTRETURN in order to prevent eax and edx from
756 * being overwritten by the syscall return value.
758 * if vu is not NULL we return the new context in %edx, the new data in %ecx,
759 * and the function pointer in %eax.
762 fetchupcall (struct vmupcall *vu, int morepending, void *rsp)
764 struct upc_frame upc_frame;
766 struct trapframe *regs;
768 struct upcall upcall;
772 regs = p->p_md.md_regs;
774 error = copyout(&morepending, &p->p_upcall->upc_pending, sizeof(int));
778 * This jumps us to the next ready context.
781 error = copyin(p->p_upcall, &upcall, sizeof(upcall));
784 error = copyin((char *)upcall.upc_uthread + upcall.upc_critoff, &crit_count, sizeof(int));
785 crit_count += TDPRI_CRIT;
787 error = copyout(&crit_count, (char *)upcall.upc_uthread + upcall.upc_critoff, sizeof(int));
788 regs->tf_eax = (register_t)vu->vu_func;
789 regs->tf_ecx = (register_t)vu->vu_data;
790 regs->tf_edx = (register_t)p->p_upcall;
791 regs->tf_eip = (register_t)vu->vu_ctx;
792 regs->tf_esp = (register_t)rsp;
795 * This returns us to the originally interrupted code.
797 error = copyin(rsp, &upc_frame, sizeof(upc_frame));
798 regs->tf_eax = upc_frame.eax;
799 regs->tf_ecx = upc_frame.ecx;
800 regs->tf_edx = upc_frame.edx;
801 regs->tf_eflags = (regs->tf_eflags & ~PSL_USERCHANGE) |
802 (upc_frame.flags & PSL_USERCHANGE);
803 regs->tf_eip = upc_frame.oldip;
804 regs->tf_esp = (register_t)((char *)rsp + sizeof(upc_frame));
813 * Machine dependent boot() routine
815 * I haven't seen anything to put here yet
816 * Possibly some stuff might be grafted back here from boot()
824 * Shutdown the CPU as much as possible
834 * cpu_idle() represents the idle LWKT. You cannot return from this function
835 * (unless you want to blow things up!). Instead we look for runnable threads
836 * and loop or halt as appropriate. Giant is not held on entry to the thread.
838 * The main loop is entered with a critical section held, we must release
839 * the critical section before doing anything else. lwkt_switch() will
840 * check for pending interrupts due to entering and exiting its own
843 * Note on cpu_idle_hlt: On an SMP system we rely on a scheduler IPI
844 * to wake a HLTed cpu up. However, there are cases where the idlethread
845 * will be entered with the possibility that no IPI will occur and in such
846 * cases lwkt_switch() sets TDF_IDLE_NOHLT.
848 static int cpu_idle_hlt = 1;
849 static int cpu_idle_hltcnt;
850 static int cpu_idle_spincnt;
851 SYSCTL_INT(_machdep, OID_AUTO, cpu_idle_hlt, CTLFLAG_RW,
852 &cpu_idle_hlt, 0, "Idle loop HLT enable");
853 SYSCTL_INT(_machdep, OID_AUTO, cpu_idle_hltcnt, CTLFLAG_RW,
854 &cpu_idle_hltcnt, 0, "Idle loop entry halts");
855 SYSCTL_INT(_machdep, OID_AUTO, cpu_idle_spincnt, CTLFLAG_RW,
856 &cpu_idle_spincnt, 0, "Idle loop entry spins");
859 cpu_idle_default_hook(void)
862 * We must guarentee that hlt is exactly the instruction
865 __asm __volatile("sti; hlt");
868 /* Other subsystems (e.g., ACPI) can hook this later. */
869 void (*cpu_idle_hook)(void) = cpu_idle_default_hook;
874 struct thread *td = curthread;
877 KKASSERT(td->td_pri < TDPRI_CRIT);
880 * See if there are any LWKTs ready to go.
885 * If we are going to halt call splz unconditionally after
886 * CLIing to catch any interrupt races. Note that we are
887 * at SPL0 and interrupts are enabled.
889 if (cpu_idle_hlt && !lwkt_runnable() &&
890 (td->td_flags & TDF_IDLE_NOHLT) == 0) {
891 __asm __volatile("cli");
896 td->td_flags &= ~TDF_IDLE_NOHLT;
898 __asm __volatile("sti");
905 * Clear registers on exec
908 setregs(p, entry, stack, ps_strings)
914 struct trapframe *regs = p->p_md.md_regs;
915 struct pcb *pcb = p->p_thread->td_pcb;
917 /* Reset pc->pcb_gs and %gs before possibly invalidating it. */
918 pcb->pcb_gs = _udatasel;
921 /* was i386_user_cleanup() in NetBSD */
924 bzero((char *)regs, sizeof(struct trapframe));
925 regs->tf_eip = entry;
926 regs->tf_esp = stack;
927 regs->tf_eflags = PSL_USER | (regs->tf_eflags & PSL_T);
928 regs->tf_ss = _udatasel;
929 regs->tf_ds = _udatasel;
930 regs->tf_es = _udatasel;
931 regs->tf_fs = _udatasel;
932 regs->tf_cs = _ucodesel;
934 /* PS_STRINGS value for BSD/OS binaries. It is 0 for non-BSD/OS. */
935 regs->tf_ebx = ps_strings;
938 * Reset the hardware debug registers if they were in use.
939 * They won't have any meaning for the newly exec'd process.
941 if (pcb->pcb_flags & PCB_DBREGS) {
948 if (pcb == curthread->td_pcb) {
950 * Clear the debug registers on the running
951 * CPU, otherwise they will end up affecting
952 * the next process we switch to.
956 pcb->pcb_flags &= ~PCB_DBREGS;
960 * Initialize the math emulator (if any) for the current process.
961 * Actually, just clear the bit that says that the emulator has
962 * been initialized. Initialization is delayed until the process
963 * traps to the emulator (if it is done at all) mainly because
964 * emulators don't provide an entry point for initialization.
966 p->p_thread->td_pcb->pcb_flags &= ~FP_SOFTFP;
969 * note: do not set CR0_TS here. npxinit() must do it after clearing
970 * gd_npxthread. Otherwise a preemptive interrupt thread may panic
974 load_cr0(rcr0() | CR0_MP);
977 /* Initialize the npx (if any) for the current process. */
978 npxinit(__INITIAL_NPXCW__);
983 * note: linux emulator needs edx to be 0x0 on entry, which is
984 * handled in execve simply by setting the 64 bit syscall
995 cr0 |= CR0_NE; /* Done by npxinit() */
996 cr0 |= CR0_MP | CR0_TS; /* Done at every execve() too. */
998 if (cpu_class != CPUCLASS_386)
1000 cr0 |= CR0_WP | CR0_AM;
1006 sysctl_machdep_adjkerntz(SYSCTL_HANDLER_ARGS)
1009 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2,
1011 if (!error && req->newptr)
1016 SYSCTL_PROC(_machdep, CPU_ADJKERNTZ, adjkerntz, CTLTYPE_INT|CTLFLAG_RW,
1017 &adjkerntz, 0, sysctl_machdep_adjkerntz, "I", "");
1019 SYSCTL_INT(_machdep, CPU_DISRTCSET, disable_rtc_set,
1020 CTLFLAG_RW, &disable_rtc_set, 0, "");
1022 SYSCTL_STRUCT(_machdep, CPU_BOOTINFO, bootinfo,
1023 CTLFLAG_RD, &bootinfo, bootinfo, "");
1025 SYSCTL_INT(_machdep, CPU_WALLCLOCK, wall_cmos_clock,
1026 CTLFLAG_RW, &wall_cmos_clock, 0, "");
1028 extern u_long bootdev; /* not a dev_t - encoding is different */
1029 SYSCTL_ULONG(_machdep, OID_AUTO, guessed_bootdev,
1030 CTLFLAG_RD, &bootdev, 0, "Boot device (not in dev_t format)");
1033 * Initialize 386 and configure to run kernel
1037 * Initialize segments & interrupt table
1041 union descriptor gdt[NGDT * MAXCPU]; /* global descriptor table */
1042 static struct gate_descriptor idt0[NIDT];
1043 struct gate_descriptor *idt = &idt0[0]; /* interrupt descriptor table */
1044 union descriptor ldt[NLDT]; /* local descriptor table */
1046 /* table descriptors - used to load tables by cpu */
1047 struct region_descriptor r_gdt, r_idt;
1049 #if defined(I586_CPU) && !defined(NO_F00F_HACK)
1050 extern int has_f00f_bug;
1053 static struct i386tss dblfault_tss;
1054 static char dblfault_stack[PAGE_SIZE];
1056 extern struct user *proc0paddr;
1059 /* software prototypes -- in more palatable form */
1060 struct soft_segment_descriptor gdt_segs[] = {
1061 /* GNULL_SEL 0 Null Descriptor */
1062 { 0x0, /* segment base address */
1064 0, /* segment type */
1065 0, /* segment descriptor priority level */
1066 0, /* segment descriptor present */
1068 0, /* default 32 vs 16 bit size */
1069 0 /* limit granularity (byte/page units)*/ },
1070 /* GCODE_SEL 1 Code Descriptor for kernel */
1071 { 0x0, /* segment base address */
1072 0xfffff, /* length - all address space */
1073 SDT_MEMERA, /* segment type */
1074 0, /* segment descriptor priority level */
1075 1, /* segment descriptor present */
1077 1, /* default 32 vs 16 bit size */
1078 1 /* limit granularity (byte/page units)*/ },
1079 /* GDATA_SEL 2 Data Descriptor for kernel */
1080 { 0x0, /* segment base address */
1081 0xfffff, /* length - all address space */
1082 SDT_MEMRWA, /* segment type */
1083 0, /* segment descriptor priority level */
1084 1, /* segment descriptor present */
1086 1, /* default 32 vs 16 bit size */
1087 1 /* limit granularity (byte/page units)*/ },
1088 /* GPRIV_SEL 3 SMP Per-Processor Private Data Descriptor */
1089 { 0x0, /* segment base address */
1090 0xfffff, /* length - all address space */
1091 SDT_MEMRWA, /* segment type */
1092 0, /* segment descriptor priority level */
1093 1, /* segment descriptor present */
1095 1, /* default 32 vs 16 bit size */
1096 1 /* limit granularity (byte/page units)*/ },
1097 /* GPROC0_SEL 4 Proc 0 Tss Descriptor */
1099 0x0, /* segment base address */
1100 sizeof(struct i386tss)-1,/* length - all address space */
1101 SDT_SYS386TSS, /* segment type */
1102 0, /* segment descriptor priority level */
1103 1, /* segment descriptor present */
1105 0, /* unused - default 32 vs 16 bit size */
1106 0 /* limit granularity (byte/page units)*/ },
1107 /* GLDT_SEL 5 LDT Descriptor */
1108 { (int) ldt, /* segment base address */
1109 sizeof(ldt)-1, /* length - all address space */
1110 SDT_SYSLDT, /* segment type */
1111 SEL_UPL, /* segment descriptor priority level */
1112 1, /* segment descriptor present */
1114 0, /* unused - default 32 vs 16 bit size */
1115 0 /* limit granularity (byte/page units)*/ },
1116 /* GUSERLDT_SEL 6 User LDT Descriptor per process */
1117 { (int) ldt, /* segment base address */
1118 (512 * sizeof(union descriptor)-1), /* length */
1119 SDT_SYSLDT, /* segment type */
1120 0, /* segment descriptor priority level */
1121 1, /* segment descriptor present */
1123 0, /* unused - default 32 vs 16 bit size */
1124 0 /* limit granularity (byte/page units)*/ },
1125 /* GTGATE_SEL 7 Null Descriptor - Placeholder */
1126 { 0x0, /* segment base address */
1127 0x0, /* length - all address space */
1128 0, /* segment type */
1129 0, /* segment descriptor priority level */
1130 0, /* segment descriptor present */
1132 0, /* default 32 vs 16 bit size */
1133 0 /* limit granularity (byte/page units)*/ },
1134 /* GBIOSLOWMEM_SEL 8 BIOS access to realmode segment 0x40, must be #8 in GDT */
1135 { 0x400, /* segment base address */
1136 0xfffff, /* length */
1137 SDT_MEMRWA, /* segment type */
1138 0, /* segment descriptor priority level */
1139 1, /* segment descriptor present */
1141 1, /* default 32 vs 16 bit size */
1142 1 /* limit granularity (byte/page units)*/ },
1143 /* GPANIC_SEL 9 Panic Tss Descriptor */
1144 { (int) &dblfault_tss, /* segment base address */
1145 sizeof(struct i386tss)-1,/* length - all address space */
1146 SDT_SYS386TSS, /* segment type */
1147 0, /* segment descriptor priority level */
1148 1, /* segment descriptor present */
1150 0, /* unused - default 32 vs 16 bit size */
1151 0 /* limit granularity (byte/page units)*/ },
1152 /* GBIOSCODE32_SEL 10 BIOS 32-bit interface (32bit Code) */
1153 { 0, /* segment base address (overwritten) */
1154 0xfffff, /* length */
1155 SDT_MEMERA, /* segment type */
1156 0, /* segment descriptor priority level */
1157 1, /* segment descriptor present */
1159 0, /* default 32 vs 16 bit size */
1160 1 /* limit granularity (byte/page units)*/ },
1161 /* GBIOSCODE16_SEL 11 BIOS 32-bit interface (16bit Code) */
1162 { 0, /* segment base address (overwritten) */
1163 0xfffff, /* length */
1164 SDT_MEMERA, /* segment type */
1165 0, /* segment descriptor priority level */
1166 1, /* segment descriptor present */
1168 0, /* default 32 vs 16 bit size */
1169 1 /* limit granularity (byte/page units)*/ },
1170 /* GBIOSDATA_SEL 12 BIOS 32-bit interface (Data) */
1171 { 0, /* segment base address (overwritten) */
1172 0xfffff, /* length */
1173 SDT_MEMRWA, /* segment type */
1174 0, /* segment descriptor priority level */
1175 1, /* segment descriptor present */
1177 1, /* default 32 vs 16 bit size */
1178 1 /* limit granularity (byte/page units)*/ },
1179 /* GBIOSUTIL_SEL 13 BIOS 16-bit interface (Utility) */
1180 { 0, /* segment base address (overwritten) */
1181 0xfffff, /* length */
1182 SDT_MEMRWA, /* segment type */
1183 0, /* segment descriptor priority level */
1184 1, /* segment descriptor present */
1186 0, /* default 32 vs 16 bit size */
1187 1 /* limit granularity (byte/page units)*/ },
1188 /* GBIOSARGS_SEL 14 BIOS 16-bit interface (Arguments) */
1189 { 0, /* segment base address (overwritten) */
1190 0xfffff, /* length */
1191 SDT_MEMRWA, /* segment type */
1192 0, /* segment descriptor priority level */
1193 1, /* segment descriptor present */
1195 0, /* default 32 vs 16 bit size */
1196 1 /* limit granularity (byte/page units)*/ },
1199 static struct soft_segment_descriptor ldt_segs[] = {
1200 /* Null Descriptor - overwritten by call gate */
1201 { 0x0, /* segment base address */
1202 0x0, /* length - all address space */
1203 0, /* segment type */
1204 0, /* segment descriptor priority level */
1205 0, /* segment descriptor present */
1207 0, /* default 32 vs 16 bit size */
1208 0 /* limit granularity (byte/page units)*/ },
1209 /* Null Descriptor - overwritten by call gate */
1210 { 0x0, /* segment base address */
1211 0x0, /* length - all address space */
1212 0, /* segment type */
1213 0, /* segment descriptor priority level */
1214 0, /* segment descriptor present */
1216 0, /* default 32 vs 16 bit size */
1217 0 /* limit granularity (byte/page units)*/ },
1218 /* Null Descriptor - overwritten by call gate */
1219 { 0x0, /* segment base address */
1220 0x0, /* length - all address space */
1221 0, /* segment type */
1222 0, /* segment descriptor priority level */
1223 0, /* segment descriptor present */
1225 0, /* default 32 vs 16 bit size */
1226 0 /* limit granularity (byte/page units)*/ },
1227 /* Code Descriptor for user */
1228 { 0x0, /* segment base address */
1229 0xfffff, /* length - all address space */
1230 SDT_MEMERA, /* segment type */
1231 SEL_UPL, /* segment descriptor priority level */
1232 1, /* segment descriptor present */
1234 1, /* default 32 vs 16 bit size */
1235 1 /* limit granularity (byte/page units)*/ },
1236 /* Null Descriptor - overwritten by call gate */
1237 { 0x0, /* segment base address */
1238 0x0, /* length - all address space */
1239 0, /* segment type */
1240 0, /* segment descriptor priority level */
1241 0, /* segment descriptor present */
1243 0, /* default 32 vs 16 bit size */
1244 0 /* limit granularity (byte/page units)*/ },
1245 /* Data Descriptor for user */
1246 { 0x0, /* segment base address */
1247 0xfffff, /* length - all address space */
1248 SDT_MEMRWA, /* segment type */
1249 SEL_UPL, /* segment descriptor priority level */
1250 1, /* segment descriptor present */
1252 1, /* default 32 vs 16 bit size */
1253 1 /* limit granularity (byte/page units)*/ },
1257 setidt(idx, func, typ, dpl, selec)
1264 struct gate_descriptor *ip;
1267 ip->gd_looffset = (int)func;
1268 ip->gd_selector = selec;
1274 ip->gd_hioffset = ((int)func)>>16 ;
1277 #define IDTVEC(name) __CONCAT(X,name)
1280 IDTVEC(div), IDTVEC(dbg), IDTVEC(nmi), IDTVEC(bpt), IDTVEC(ofl),
1281 IDTVEC(bnd), IDTVEC(ill), IDTVEC(dna), IDTVEC(fpusegm),
1282 IDTVEC(tss), IDTVEC(missing), IDTVEC(stk), IDTVEC(prot),
1283 IDTVEC(page), IDTVEC(mchk), IDTVEC(fpu), IDTVEC(align),
1284 IDTVEC(xmm), IDTVEC(syscall),
1287 IDTVEC(int0x80_syscall), IDTVEC(int0x81_syscall),
1288 IDTVEC(int0x82_syscall);
1290 #ifdef DEBUG_INTERRUPTS
1291 extern inthand_t *Xrsvdary[256];
1296 struct segment_descriptor *sd;
1297 struct soft_segment_descriptor *ssd;
1299 ssd->ssd_base = (sd->sd_hibase << 24) | sd->sd_lobase;
1300 ssd->ssd_limit = (sd->sd_hilimit << 16) | sd->sd_lolimit;
1301 ssd->ssd_type = sd->sd_type;
1302 ssd->ssd_dpl = sd->sd_dpl;
1303 ssd->ssd_p = sd->sd_p;
1304 ssd->ssd_def32 = sd->sd_def32;
1305 ssd->ssd_gran = sd->sd_gran;
1308 #define PHYSMAP_SIZE (2 * 8)
1311 * Populate the (physmap) array with base/bound pairs describing the
1312 * available physical memory in the system, then test this memory and
1313 * build the phys_avail array describing the actually-available memory.
1315 * If we cannot accurately determine the physical memory map, then use
1316 * value from the 0xE801 call, and failing that, the RTC.
1318 * Total memory size may be set by the kernel environment variable
1319 * hw.physmem or the compile-time define MAXMEM.
1322 getmemsize(int first)
1324 int i, physmap_idx, pa_indx;
1326 u_int basemem, extmem;
1327 struct vm86frame vmf;
1328 struct vm86context vmc;
1329 vm_offset_t pa, physmap[PHYSMAP_SIZE];
1339 TUNABLE_INT_FETCH("hw.hasbrokenint12", &hasbrokenint12);
1340 bzero(&vmf, sizeof(struct vm86frame));
1341 bzero(physmap, sizeof(physmap));
1345 * Some newer BIOSes has broken INT 12H implementation which cause
1346 * kernel panic immediately. In this case, we need to scan SMAP
1347 * with INT 15:E820 first, then determine base memory size.
1349 if (hasbrokenint12) {
1354 * Perform "base memory" related probes & setup. If we get a crazy
1355 * value give the bios some scribble space just in case.
1357 vm86_intcall(0x12, &vmf);
1358 basemem = vmf.vmf_ax;
1359 if (basemem > 640) {
1360 printf("Preposterous BIOS basemem of %uK, "
1361 "truncating to < 640K\n", basemem);
1366 * XXX if biosbasemem is now < 640, there is a `hole'
1367 * between the end of base memory and the start of
1368 * ISA memory. The hole may be empty or it may
1369 * contain BIOS code or data. Map it read/write so
1370 * that the BIOS can write to it. (Memory from 0 to
1371 * the physical end of the kernel is mapped read-only
1372 * to begin with and then parts of it are remapped.
1373 * The parts that aren't remapped form holes that
1374 * remain read-only and are unused by the kernel.
1375 * The base memory area is below the physical end of
1376 * the kernel and right now forms a read-only hole.
1377 * The part of it from PAGE_SIZE to
1378 * (trunc_page(biosbasemem * 1024) - 1) will be
1379 * remapped and used by the kernel later.)
1381 * This code is similar to the code used in
1382 * pmap_mapdev, but since no memory needs to be
1383 * allocated we simply change the mapping.
1385 for (pa = trunc_page(basemem * 1024);
1386 pa < ISA_HOLE_START; pa += PAGE_SIZE) {
1387 pte = vtopte(pa + KERNBASE);
1388 *pte = pa | PG_RW | PG_V;
1392 * if basemem != 640, map pages r/w into vm86 page table so
1393 * that the bios can scribble on it.
1396 for (i = basemem / 4; i < 160; i++)
1397 pte[i] = (i << PAGE_SHIFT) | PG_V | PG_RW | PG_U;
1401 * map page 1 R/W into the kernel page table so we can use it
1402 * as a buffer. The kernel will unmap this page later.
1404 pte = vtopte(KERNBASE + (1 << PAGE_SHIFT));
1405 *pte = (1 << PAGE_SHIFT) | PG_RW | PG_V;
1408 * get memory map with INT 15:E820
1410 #define SMAPSIZ sizeof(*smap)
1411 #define SMAP_SIG 0x534D4150 /* 'SMAP' */
1414 smap = (void *)vm86_addpage(&vmc, 1, KERNBASE + (1 << PAGE_SHIFT));
1415 vm86_getptr(&vmc, (vm_offset_t)smap, &vmf.vmf_es, &vmf.vmf_di);
1420 vmf.vmf_eax = 0xE820;
1421 vmf.vmf_edx = SMAP_SIG;
1422 vmf.vmf_ecx = SMAPSIZ;
1423 i = vm86_datacall(0x15, &vmf, &vmc);
1424 if (i || vmf.vmf_eax != SMAP_SIG)
1426 if (boothowto & RB_VERBOSE)
1427 printf("SMAP type=%02x base=%08x %08x len=%08x %08x\n",
1429 *(u_int32_t *)((char *)&smap->base + 4),
1430 (u_int32_t)smap->base,
1431 *(u_int32_t *)((char *)&smap->length + 4),
1432 (u_int32_t)smap->length);
1434 if (smap->type != 0x01)
1437 if (smap->length == 0)
1440 if (smap->base >= 0xffffffff) {
1441 printf("%uK of memory above 4GB ignored\n",
1442 (u_int)(smap->length / 1024));
1446 for (i = 0; i <= physmap_idx; i += 2) {
1447 if (smap->base < physmap[i + 1]) {
1448 if (boothowto & RB_VERBOSE)
1450 "Overlapping or non-montonic memory region, ignoring second region\n");
1455 if (smap->base == physmap[physmap_idx + 1]) {
1456 physmap[physmap_idx + 1] += smap->length;
1461 if (physmap_idx == PHYSMAP_SIZE) {
1463 "Too many segments in the physical address map, giving up\n");
1466 physmap[physmap_idx] = smap->base;
1467 physmap[physmap_idx + 1] = smap->base + smap->length;
1469 ; /* fix GCC3.x warning */
1470 } while (vmf.vmf_ebx != 0);
1473 * Perform "base memory" related probes & setup based on SMAP
1476 for (i = 0; i <= physmap_idx; i += 2) {
1477 if (physmap[i] == 0x00000000) {
1478 basemem = physmap[i + 1] / 1024;
1487 if (basemem > 640) {
1488 printf("Preposterous BIOS basemem of %uK, truncating to 640K\n",
1493 for (pa = trunc_page(basemem * 1024);
1494 pa < ISA_HOLE_START; pa += PAGE_SIZE) {
1495 pte = vtopte(pa + KERNBASE);
1496 *pte = pa | PG_RW | PG_V;
1500 for (i = basemem / 4; i < 160; i++)
1501 pte[i] = (i << PAGE_SHIFT) | PG_V | PG_RW | PG_U;
1504 if (physmap[1] != 0)
1508 * If we failed above, try memory map with INT 15:E801
1510 vmf.vmf_ax = 0xE801;
1511 if (vm86_intcall(0x15, &vmf) == 0) {
1512 extmem = vmf.vmf_cx + vmf.vmf_dx * 64;
1516 vm86_intcall(0x15, &vmf);
1517 extmem = vmf.vmf_ax;
1520 * Prefer the RTC value for extended memory.
1522 extmem = rtcin(RTC_EXTLO) + (rtcin(RTC_EXTHI) << 8);
1527 * Special hack for chipsets that still remap the 384k hole when
1528 * there's 16MB of memory - this really confuses people that
1529 * are trying to use bus mastering ISA controllers with the
1530 * "16MB limit"; they only have 16MB, but the remapping puts
1531 * them beyond the limit.
1533 * If extended memory is between 15-16MB (16-17MB phys address range),
1536 if ((extmem > 15 * 1024) && (extmem < 16 * 1024))
1540 physmap[1] = basemem * 1024;
1542 physmap[physmap_idx] = 0x100000;
1543 physmap[physmap_idx + 1] = physmap[physmap_idx] + extmem * 1024;
1547 * Now, physmap contains a map of physical memory.
1551 /* make hole for AP bootstrap code YYY */
1552 physmap[1] = mp_bootaddress(physmap[1] / 1024);
1554 /* look for the MP hardware - needed for apic addresses */
1559 * Maxmem isn't the "maximum memory", it's one larger than the
1560 * highest page of the physical address space. It should be
1561 * called something like "Maxphyspage". We may adjust this
1562 * based on ``hw.physmem'' and the results of the memory test.
1564 Maxmem = atop(physmap[physmap_idx + 1]);
1567 Maxmem = MAXMEM / 4;
1571 * hw.physmem is a size in bytes; we also allow k, m, and g suffixes
1572 * for the appropriate modifiers. This overrides MAXMEM.
1574 if ((cp = getenv("hw.physmem")) != NULL) {
1575 u_int64_t AllowMem, sanity;
1578 sanity = AllowMem = strtouq(cp, &ep, 0);
1579 if ((ep != cp) && (*ep != 0)) {
1592 AllowMem = sanity = 0;
1594 if (AllowMem < sanity)
1598 printf("Ignoring invalid memory size of '%s'\n", cp);
1600 Maxmem = atop(AllowMem);
1603 if (atop(physmap[physmap_idx + 1]) != Maxmem &&
1604 (boothowto & RB_VERBOSE))
1605 printf("Physical memory use set to %lluK\n", Maxmem * 4);
1608 * If Maxmem has been increased beyond what the system has detected,
1609 * extend the last memory segment to the new limit.
1611 if (atop(physmap[physmap_idx + 1]) < Maxmem)
1612 physmap[physmap_idx + 1] = ptoa(Maxmem);
1614 /* call pmap initialization to make new kernel address space */
1615 pmap_bootstrap(first, 0);
1618 * Size up each available chunk of physical memory.
1620 physmap[0] = PAGE_SIZE; /* mask off page 0 */
1622 phys_avail[pa_indx++] = physmap[0];
1623 phys_avail[pa_indx] = physmap[0];
1627 * physmap is in bytes, so when converting to page boundaries,
1628 * round up the start address and round down the end address.
1630 for (i = 0; i <= physmap_idx; i += 2) {
1634 if (physmap[i + 1] < end)
1635 end = trunc_page(physmap[i + 1]);
1636 for (pa = round_page(physmap[i]); pa < end; pa += PAGE_SIZE) {
1641 int *ptr = (int *)CADDR1;
1645 * block out kernel memory as not available.
1647 if (pa >= 0x100000 && pa < first)
1653 * map page into kernel: valid, read/write,non-cacheable
1655 *pte = pa | PG_V | PG_RW | PG_N;
1660 * Test for alternating 1's and 0's
1662 *(volatile int *)ptr = 0xaaaaaaaa;
1663 if (*(volatile int *)ptr != 0xaaaaaaaa) {
1667 * Test for alternating 0's and 1's
1669 *(volatile int *)ptr = 0x55555555;
1670 if (*(volatile int *)ptr != 0x55555555) {
1676 *(volatile int *)ptr = 0xffffffff;
1677 if (*(volatile int *)ptr != 0xffffffff) {
1683 *(volatile int *)ptr = 0x0;
1684 if (*(volatile int *)ptr != 0x0) {
1688 * Restore original value.
1693 * Adjust array of valid/good pages.
1695 if (page_bad == TRUE) {
1699 * If this good page is a continuation of the
1700 * previous set of good pages, then just increase
1701 * the end pointer. Otherwise start a new chunk.
1702 * Note that "end" points one higher than end,
1703 * making the range >= start and < end.
1704 * If we're also doing a speculative memory
1705 * test and we at or past the end, bump up Maxmem
1706 * so that we keep going. The first bad page
1707 * will terminate the loop.
1709 if (phys_avail[pa_indx] == pa) {
1710 phys_avail[pa_indx] += PAGE_SIZE;
1713 if (pa_indx == PHYS_AVAIL_ARRAY_END) {
1714 printf("Too many holes in the physical address space, giving up\n");
1718 phys_avail[pa_indx++] = pa; /* start */
1719 phys_avail[pa_indx] = pa + PAGE_SIZE; /* end */
1729 * The last chunk must contain at least one page plus the message
1730 * buffer to avoid complicating other code (message buffer address
1731 * calculation, etc.).
1733 while (phys_avail[pa_indx - 1] + PAGE_SIZE +
1734 round_page(MSGBUF_SIZE) >= phys_avail[pa_indx]) {
1735 physmem -= atop(phys_avail[pa_indx] - phys_avail[pa_indx - 1]);
1736 phys_avail[pa_indx--] = 0;
1737 phys_avail[pa_indx--] = 0;
1740 Maxmem = atop(phys_avail[pa_indx]);
1742 /* Trim off space for the message buffer. */
1743 phys_avail[pa_indx] -= round_page(MSGBUF_SIZE);
1745 avail_end = phys_avail[pa_indx];
1757 * 7 Device Not Available (x87)
1759 * 9 Coprocessor Segment overrun (unsupported, reserved)
1761 * 11 Segment not present
1763 * 13 General Protection
1766 * 16 x87 FP Exception pending
1767 * 17 Alignment Check
1769 * 19 SIMD floating point
1771 * 32-255 INTn/external sources
1776 struct gate_descriptor *gdp;
1777 int gsel_tss, metadata_missing, off, x;
1778 struct mdglobaldata *gd;
1781 * Prevent lowering of the ipl if we call tsleep() early.
1783 gd = &CPU_prvspace[0].mdglobaldata;
1784 bzero(gd, sizeof(*gd));
1786 gd->mi.gd_curthread = &thread0;
1788 atdevbase = ISA_HOLE_START + KERNBASE;
1790 metadata_missing = 0;
1791 if (bootinfo.bi_modulep) {
1792 preload_metadata = (caddr_t)bootinfo.bi_modulep + KERNBASE;
1793 preload_bootstrap_relocate(KERNBASE);
1795 metadata_missing = 1;
1797 if (bootinfo.bi_envp)
1798 kern_envp = (caddr_t)bootinfo.bi_envp + KERNBASE;
1801 * start with one cpu. Note: ncpus2_shift and ncpus2_mask are left
1806 /* Init basic tunables, hz etc */
1810 * make gdt memory segments, the code segment goes up to end of the
1811 * page with etext in it, the data segment goes to the end of
1815 * XXX text protection is temporarily (?) disabled. The limit was
1816 * i386_btop(round_page(etext)) - 1.
1818 gdt_segs[GCODE_SEL].ssd_limit = atop(0 - 1);
1819 gdt_segs[GDATA_SEL].ssd_limit = atop(0 - 1);
1821 gdt_segs[GPRIV_SEL].ssd_limit =
1822 atop(sizeof(struct privatespace) - 1);
1823 gdt_segs[GPRIV_SEL].ssd_base = (int) &CPU_prvspace[0];
1824 gdt_segs[GPROC0_SEL].ssd_base =
1825 (int) &CPU_prvspace[0].mdglobaldata.gd_common_tss;
1827 gd->mi.gd_prvspace = &CPU_prvspace[0];
1830 * Note: on both UP and SMP curthread must be set non-NULL
1831 * early in the boot sequence because the system assumes
1832 * that 'curthread' is never NULL.
1835 for (x = 0; x < NGDT; x++) {
1837 /* avoid overwriting db entries with APM ones */
1838 if (x >= GAPMCODE32_SEL && x <= GAPMDATA_SEL)
1841 ssdtosd(&gdt_segs[x], &gdt[x].sd);
1844 r_gdt.rd_limit = NGDT * sizeof(gdt[0]) - 1;
1845 r_gdt.rd_base = (int) gdt;
1848 mi_gdinit(&gd->mi, 0);
1850 lwkt_init_thread(&thread0, proc0paddr, LWKT_THREAD_STACK, 0, &gd->mi);
1851 lwkt_set_comm(&thread0, "thread0");
1852 proc0.p_addr = (void *)thread0.td_kstack;
1853 proc0.p_thread = &thread0;
1854 varsymset_init(&proc0.p_varsymset, NULL);
1855 thread0.td_flags |= TDF_RUNNING;
1856 thread0.td_proc = &proc0;
1857 thread0.td_switch = cpu_heavy_switch; /* YYY eventually LWKT */
1858 safepri = thread0.td_cpl = SWI_MASK | HWI_MASK;
1860 /* make ldt memory segments */
1862 * XXX - VM_MAXUSER_ADDRESS is an end address, not a max. And it
1863 * should be spelled ...MAX_USER...
1865 ldt_segs[LUCODE_SEL].ssd_limit = atop(VM_MAXUSER_ADDRESS - 1);
1866 ldt_segs[LUDATA_SEL].ssd_limit = atop(VM_MAXUSER_ADDRESS - 1);
1867 for (x = 0; x < sizeof ldt_segs / sizeof ldt_segs[0]; x++)
1868 ssdtosd(&ldt_segs[x], &ldt[x].sd);
1870 _default_ldt = GSEL(GLDT_SEL, SEL_KPL);
1872 gd->gd_currentldt = _default_ldt;
1873 /* spinlocks and the BGL */
1877 for (x = 0; x < NIDT; x++) {
1878 #ifdef DEBUG_INTERRUPTS
1879 setidt(x, Xrsvdary[x], SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1881 setidt(x, &IDTVEC(rsvd0), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1884 setidt(0, &IDTVEC(div), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1885 setidt(1, &IDTVEC(dbg), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1886 setidt(2, &IDTVEC(nmi), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1887 setidt(3, &IDTVEC(bpt), SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL));
1888 setidt(4, &IDTVEC(ofl), SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL));
1889 setidt(5, &IDTVEC(bnd), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1890 setidt(6, &IDTVEC(ill), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1891 setidt(7, &IDTVEC(dna), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1892 setidt(8, 0, SDT_SYSTASKGT, SEL_KPL, GSEL(GPANIC_SEL, SEL_KPL));
1893 setidt(9, &IDTVEC(fpusegm), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1894 setidt(10, &IDTVEC(tss), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1895 setidt(11, &IDTVEC(missing), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1896 setidt(12, &IDTVEC(stk), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1897 setidt(13, &IDTVEC(prot), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1898 setidt(14, &IDTVEC(page), SDT_SYS386IGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1899 setidt(15, &IDTVEC(rsvd0), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1900 setidt(16, &IDTVEC(fpu), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1901 setidt(17, &IDTVEC(align), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1902 setidt(18, &IDTVEC(mchk), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1903 setidt(19, &IDTVEC(xmm), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1904 setidt(0x80, &IDTVEC(int0x80_syscall),
1905 SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL));
1906 setidt(0x81, &IDTVEC(int0x81_syscall),
1907 SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL));
1908 setidt(0x82, &IDTVEC(int0x82_syscall),
1909 SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL));
1911 r_idt.rd_limit = sizeof(idt0) - 1;
1912 r_idt.rd_base = (int) idt;
1916 * Initialize the console before we print anything out.
1920 if (metadata_missing)
1921 printf("WARNING: loader(8) metadata is missing!\n");
1930 if (boothowto & RB_KDB)
1931 Debugger("Boot flags requested debugger");
1934 finishidentcpu(); /* Final stage of CPU initialization */
1935 setidt(6, &IDTVEC(ill), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1936 setidt(13, &IDTVEC(prot), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1937 initializecpu(); /* Initialize CPU registers */
1940 * make an initial tss so cpu can get interrupt stack on syscall!
1941 * The 16 bytes is to save room for a VM86 context.
1943 gd->gd_common_tss.tss_esp0 = (int) thread0.td_pcb - 16;
1944 gd->gd_common_tss.tss_ss0 = GSEL(GDATA_SEL, SEL_KPL) ;
1945 gsel_tss = GSEL(GPROC0_SEL, SEL_KPL);
1946 gd->gd_tss_gdt = &gdt[GPROC0_SEL].sd;
1947 gd->gd_common_tssd = *gd->gd_tss_gdt;
1948 gd->gd_common_tss.tss_ioopt = (sizeof gd->gd_common_tss) << 16;
1951 dblfault_tss.tss_esp = dblfault_tss.tss_esp0 = dblfault_tss.tss_esp1 =
1952 dblfault_tss.tss_esp2 = (int) &dblfault_stack[sizeof(dblfault_stack)];
1953 dblfault_tss.tss_ss = dblfault_tss.tss_ss0 = dblfault_tss.tss_ss1 =
1954 dblfault_tss.tss_ss2 = GSEL(GDATA_SEL, SEL_KPL);
1955 dblfault_tss.tss_cr3 = (int)IdlePTD;
1956 dblfault_tss.tss_eip = (int) dblfault_handler;
1957 dblfault_tss.tss_eflags = PSL_KERNEL;
1958 dblfault_tss.tss_ds = dblfault_tss.tss_es =
1959 dblfault_tss.tss_gs = GSEL(GDATA_SEL, SEL_KPL);
1960 dblfault_tss.tss_fs = GSEL(GPRIV_SEL, SEL_KPL);
1961 dblfault_tss.tss_cs = GSEL(GCODE_SEL, SEL_KPL);
1962 dblfault_tss.tss_ldt = GSEL(GLDT_SEL, SEL_KPL);
1966 init_param2(physmem);
1968 /* now running on new page tables, configured,and u/iom is accessible */
1970 /* Map the message buffer. */
1971 for (off = 0; off < round_page(MSGBUF_SIZE); off += PAGE_SIZE)
1972 pmap_kenter((vm_offset_t)msgbufp + off, avail_end + off);
1974 msgbufinit(msgbufp, MSGBUF_SIZE);
1976 /* make a call gate to reenter kernel with */
1977 gdp = &ldt[LSYS5CALLS_SEL].gd;
1979 x = (int) &IDTVEC(syscall);
1980 gdp->gd_looffset = x++;
1981 gdp->gd_selector = GSEL(GCODE_SEL,SEL_KPL);
1983 gdp->gd_type = SDT_SYS386CGT;
1984 gdp->gd_dpl = SEL_UPL;
1986 gdp->gd_hioffset = ((int) &IDTVEC(syscall)) >>16;
1988 /* XXX does this work? */
1989 ldt[LBSDICALLS_SEL] = ldt[LSYS5CALLS_SEL];
1990 ldt[LSOL26CALLS_SEL] = ldt[LSYS5CALLS_SEL];
1992 /* transfer to user mode */
1994 _ucodesel = LSEL(LUCODE_SEL, SEL_UPL);
1995 _udatasel = LSEL(LUDATA_SEL, SEL_UPL);
1997 /* setup proc 0's pcb */
1998 thread0.td_pcb->pcb_flags = 0;
1999 thread0.td_pcb->pcb_cr3 = (int)IdlePTD; /* should already be setup */
2000 thread0.td_pcb->pcb_ext = 0;
2001 proc0.p_md.md_regs = &proc0_tf;
2005 * Initialize machine-dependant portions of the global data structure.
2006 * Note that the global data area and cpu0's idlestack in the private
2007 * data space were allocated in locore.
2009 * Note: the idlethread's cpl is 0
2011 * WARNING! Called from early boot, 'mycpu' may not work yet.
2014 cpu_gdinit(struct mdglobaldata *gd, int cpu)
2017 gd->mi.gd_curthread = &gd->mi.gd_idlethread;
2019 lwkt_init_thread(&gd->mi.gd_idlethread,
2020 gd->mi.gd_prvspace->idlestack,
2021 sizeof(gd->mi.gd_prvspace->idlestack), 0, &gd->mi);
2022 lwkt_set_comm(&gd->mi.gd_idlethread, "idle_%d", cpu);
2023 gd->mi.gd_idlethread.td_switch = cpu_lwkt_switch;
2024 gd->mi.gd_idlethread.td_sp -= sizeof(void *);
2025 *(void **)gd->mi.gd_idlethread.td_sp = cpu_idle_restore;
2029 globaldata_find(int cpu)
2031 KKASSERT(cpu >= 0 && cpu < ncpus);
2032 return(&CPU_prvspace[cpu].mdglobaldata.mi);
2035 #if defined(I586_CPU) && !defined(NO_F00F_HACK)
2036 static void f00f_hack(void *unused);
2037 SYSINIT(f00f_hack, SI_SUB_INTRINSIC, SI_ORDER_FIRST, f00f_hack, NULL);
2040 f00f_hack(void *unused)
2042 struct gate_descriptor *new_idt;
2048 printf("Intel Pentium detected, installing workaround for F00F bug\n");
2050 r_idt.rd_limit = sizeof(idt0) - 1;
2052 tmp = kmem_alloc(kernel_map, PAGE_SIZE * 2);
2054 panic("kmem_alloc returned 0");
2055 if (((unsigned int)tmp & (PAGE_SIZE-1)) != 0)
2056 panic("kmem_alloc returned non-page-aligned memory");
2057 /* Put the first seven entries in the lower page */
2058 new_idt = (struct gate_descriptor*)(tmp + PAGE_SIZE - (7*8));
2059 bcopy(idt, new_idt, sizeof(idt0));
2060 r_idt.rd_base = (int)new_idt;
2063 if (vm_map_protect(kernel_map, tmp, tmp + PAGE_SIZE,
2064 VM_PROT_READ, FALSE) != KERN_SUCCESS)
2065 panic("vm_map_protect failed");
2068 #endif /* defined(I586_CPU) && !NO_F00F_HACK */
2071 ptrace_set_pc(p, addr)
2075 p->p_md.md_regs->tf_eip = addr;
2080 ptrace_single_step(p)
2083 p->p_md.md_regs->tf_eflags |= PSL_T;
2087 int ptrace_read_u_check(p, addr, len)
2094 if ((vm_offset_t) (addr + len) < addr)
2096 if ((vm_offset_t) (addr + len) <= sizeof(struct user))
2099 gap = (char *) p->p_md.md_regs - (char *) p->p_addr;
2101 if ((vm_offset_t) addr < gap)
2103 if ((vm_offset_t) (addr + len) <=
2104 (vm_offset_t) (gap + sizeof(struct trapframe)))
2109 int ptrace_write_u(p, off, data)
2114 struct trapframe frame_copy;
2116 struct trapframe *tp;
2119 * Privileged kernel state is scattered all over the user area.
2120 * Only allow write access to parts of regs and to fpregs.
2122 min = (char *)p->p_md.md_regs - (char *)p->p_addr;
2123 if (off >= min && off <= min + sizeof(struct trapframe) - sizeof(int)) {
2124 tp = p->p_md.md_regs;
2126 *(int *)((char *)&frame_copy + (off - min)) = data;
2127 if (!EFL_SECURE(frame_copy.tf_eflags, tp->tf_eflags) ||
2128 !CS_SECURE(frame_copy.tf_cs))
2130 *(int*)((char *)p->p_addr + off) = data;
2135 * The PCB is at the end of the user area YYY
2137 min = (char *)p->p_thread->td_pcb - (char *)p->p_addr;
2138 min += offsetof(struct pcb, pcb_save);
2139 if (off >= min && off <= min + sizeof(union savefpu) - sizeof(int)) {
2140 *(int*)((char *)p->p_addr + off) = data;
2152 struct trapframe *tp;
2154 tp = p->p_md.md_regs;
2155 regs->r_fs = tp->tf_fs;
2156 regs->r_es = tp->tf_es;
2157 regs->r_ds = tp->tf_ds;
2158 regs->r_edi = tp->tf_edi;
2159 regs->r_esi = tp->tf_esi;
2160 regs->r_ebp = tp->tf_ebp;
2161 regs->r_ebx = tp->tf_ebx;
2162 regs->r_edx = tp->tf_edx;
2163 regs->r_ecx = tp->tf_ecx;
2164 regs->r_eax = tp->tf_eax;
2165 regs->r_eip = tp->tf_eip;
2166 regs->r_cs = tp->tf_cs;
2167 regs->r_eflags = tp->tf_eflags;
2168 regs->r_esp = tp->tf_esp;
2169 regs->r_ss = tp->tf_ss;
2170 pcb = p->p_thread->td_pcb;
2171 regs->r_gs = pcb->pcb_gs;
2181 struct trapframe *tp;
2183 tp = p->p_md.md_regs;
2184 if (!EFL_SECURE(regs->r_eflags, tp->tf_eflags) ||
2185 !CS_SECURE(regs->r_cs))
2187 tp->tf_fs = regs->r_fs;
2188 tp->tf_es = regs->r_es;
2189 tp->tf_ds = regs->r_ds;
2190 tp->tf_edi = regs->r_edi;
2191 tp->tf_esi = regs->r_esi;
2192 tp->tf_ebp = regs->r_ebp;
2193 tp->tf_ebx = regs->r_ebx;
2194 tp->tf_edx = regs->r_edx;
2195 tp->tf_ecx = regs->r_ecx;
2196 tp->tf_eax = regs->r_eax;
2197 tp->tf_eip = regs->r_eip;
2198 tp->tf_cs = regs->r_cs;
2199 tp->tf_eflags = regs->r_eflags;
2200 tp->tf_esp = regs->r_esp;
2201 tp->tf_ss = regs->r_ss;
2202 pcb = p->p_thread->td_pcb;
2203 pcb->pcb_gs = regs->r_gs;
2207 #ifndef CPU_DISABLE_SSE
2209 fill_fpregs_xmm(sv_xmm, sv_87)
2210 struct savexmm *sv_xmm;
2211 struct save87 *sv_87;
2213 struct env87 *penv_87 = &sv_87->sv_env;
2214 struct envxmm *penv_xmm = &sv_xmm->sv_env;
2217 /* FPU control/status */
2218 penv_87->en_cw = penv_xmm->en_cw;
2219 penv_87->en_sw = penv_xmm->en_sw;
2220 penv_87->en_tw = penv_xmm->en_tw;
2221 penv_87->en_fip = penv_xmm->en_fip;
2222 penv_87->en_fcs = penv_xmm->en_fcs;
2223 penv_87->en_opcode = penv_xmm->en_opcode;
2224 penv_87->en_foo = penv_xmm->en_foo;
2225 penv_87->en_fos = penv_xmm->en_fos;
2228 for (i = 0; i < 8; ++i)
2229 sv_87->sv_ac[i] = sv_xmm->sv_fp[i].fp_acc;
2231 sv_87->sv_ex_sw = sv_xmm->sv_ex_sw;
2235 set_fpregs_xmm(sv_87, sv_xmm)
2236 struct save87 *sv_87;
2237 struct savexmm *sv_xmm;
2239 struct env87 *penv_87 = &sv_87->sv_env;
2240 struct envxmm *penv_xmm = &sv_xmm->sv_env;
2243 /* FPU control/status */
2244 penv_xmm->en_cw = penv_87->en_cw;
2245 penv_xmm->en_sw = penv_87->en_sw;
2246 penv_xmm->en_tw = penv_87->en_tw;
2247 penv_xmm->en_fip = penv_87->en_fip;
2248 penv_xmm->en_fcs = penv_87->en_fcs;
2249 penv_xmm->en_opcode = penv_87->en_opcode;
2250 penv_xmm->en_foo = penv_87->en_foo;
2251 penv_xmm->en_fos = penv_87->en_fos;
2254 for (i = 0; i < 8; ++i)
2255 sv_xmm->sv_fp[i].fp_acc = sv_87->sv_ac[i];
2257 sv_xmm->sv_ex_sw = sv_87->sv_ex_sw;
2259 #endif /* CPU_DISABLE_SSE */
2262 fill_fpregs(p, fpregs)
2264 struct fpreg *fpregs;
2266 #ifndef CPU_DISABLE_SSE
2268 fill_fpregs_xmm(&p->p_thread->td_pcb->pcb_save.sv_xmm,
2269 (struct save87 *)fpregs);
2272 #endif /* CPU_DISABLE_SSE */
2273 bcopy(&p->p_thread->td_pcb->pcb_save.sv_87, fpregs, sizeof *fpregs);
2278 set_fpregs(p, fpregs)
2280 struct fpreg *fpregs;
2282 #ifndef CPU_DISABLE_SSE
2284 set_fpregs_xmm((struct save87 *)fpregs,
2285 &p->p_thread->td_pcb->pcb_save.sv_xmm);
2288 #endif /* CPU_DISABLE_SSE */
2289 bcopy(fpregs, &p->p_thread->td_pcb->pcb_save.sv_87, sizeof *fpregs);
2294 fill_dbregs(p, dbregs)
2296 struct dbreg *dbregs;
2301 dbregs->dr0 = rdr0();
2302 dbregs->dr1 = rdr1();
2303 dbregs->dr2 = rdr2();
2304 dbregs->dr3 = rdr3();
2305 dbregs->dr4 = rdr4();
2306 dbregs->dr5 = rdr5();
2307 dbregs->dr6 = rdr6();
2308 dbregs->dr7 = rdr7();
2311 pcb = p->p_thread->td_pcb;
2312 dbregs->dr0 = pcb->pcb_dr0;
2313 dbregs->dr1 = pcb->pcb_dr1;
2314 dbregs->dr2 = pcb->pcb_dr2;
2315 dbregs->dr3 = pcb->pcb_dr3;
2318 dbregs->dr6 = pcb->pcb_dr6;
2319 dbregs->dr7 = pcb->pcb_dr7;
2325 set_dbregs(p, dbregs)
2327 struct dbreg *dbregs;
2331 u_int32_t mask1, mask2;
2334 load_dr0(dbregs->dr0);
2335 load_dr1(dbregs->dr1);
2336 load_dr2(dbregs->dr2);
2337 load_dr3(dbregs->dr3);
2338 load_dr4(dbregs->dr4);
2339 load_dr5(dbregs->dr5);
2340 load_dr6(dbregs->dr6);
2341 load_dr7(dbregs->dr7);
2345 * Don't let an illegal value for dr7 get set. Specifically,
2346 * check for undefined settings. Setting these bit patterns
2347 * result in undefined behaviour and can lead to an unexpected
2350 for (i = 0, mask1 = 0x3<<16, mask2 = 0x2<<16; i < 8;
2351 i++, mask1 <<= 2, mask2 <<= 2)
2352 if ((dbregs->dr7 & mask1) == mask2)
2355 pcb = p->p_thread->td_pcb;
2358 * Don't let a process set a breakpoint that is not within the
2359 * process's address space. If a process could do this, it
2360 * could halt the system by setting a breakpoint in the kernel
2361 * (if ddb was enabled). Thus, we need to check to make sure
2362 * that no breakpoints are being enabled for addresses outside
2363 * process's address space, unless, perhaps, we were called by
2366 * XXX - what about when the watched area of the user's
2367 * address space is written into from within the kernel
2368 * ... wouldn't that still cause a breakpoint to be generated
2369 * from within kernel mode?
2372 if (suser_cred(p->p_ucred, 0) != 0) {
2373 if (dbregs->dr7 & 0x3) {
2374 /* dr0 is enabled */
2375 if (dbregs->dr0 >= VM_MAXUSER_ADDRESS)
2379 if (dbregs->dr7 & (0x3<<2)) {
2380 /* dr1 is enabled */
2381 if (dbregs->dr1 >= VM_MAXUSER_ADDRESS)
2385 if (dbregs->dr7 & (0x3<<4)) {
2386 /* dr2 is enabled */
2387 if (dbregs->dr2 >= VM_MAXUSER_ADDRESS)
2391 if (dbregs->dr7 & (0x3<<6)) {
2392 /* dr3 is enabled */
2393 if (dbregs->dr3 >= VM_MAXUSER_ADDRESS)
2398 pcb->pcb_dr0 = dbregs->dr0;
2399 pcb->pcb_dr1 = dbregs->dr1;
2400 pcb->pcb_dr2 = dbregs->dr2;
2401 pcb->pcb_dr3 = dbregs->dr3;
2402 pcb->pcb_dr6 = dbregs->dr6;
2403 pcb->pcb_dr7 = dbregs->dr7;
2405 pcb->pcb_flags |= PCB_DBREGS;
2412 * Return > 0 if a hardware breakpoint has been hit, and the
2413 * breakpoint was in user space. Return 0, otherwise.
2416 user_dbreg_trap(void)
2418 u_int32_t dr7, dr6; /* debug registers dr6 and dr7 */
2419 u_int32_t bp; /* breakpoint bits extracted from dr6 */
2420 int nbp; /* number of breakpoints that triggered */
2421 caddr_t addr[4]; /* breakpoint addresses */
2425 if ((dr7 & 0x000000ff) == 0) {
2427 * all GE and LE bits in the dr7 register are zero,
2428 * thus the trap couldn't have been caused by the
2429 * hardware debug registers
2436 bp = dr6 & 0x0000000f;
2440 * None of the breakpoint bits are set meaning this
2441 * trap was not caused by any of the debug registers
2447 * at least one of the breakpoints were hit, check to see
2448 * which ones and if any of them are user space addresses
2452 addr[nbp++] = (caddr_t)rdr0();
2455 addr[nbp++] = (caddr_t)rdr1();
2458 addr[nbp++] = (caddr_t)rdr2();
2461 addr[nbp++] = (caddr_t)rdr3();
2464 for (i=0; i<nbp; i++) {
2466 (caddr_t)VM_MAXUSER_ADDRESS) {
2468 * addr[i] is in user space
2475 * None of the breakpoints are in user space.
2483 Debugger(const char *msg)
2485 printf("Debugger(\"%s\") called.\n", msg);
2489 #include <machine/apicvar.h>
2492 * Provide stub functions so that the MADT APIC enumerator in the acpi
2493 * kernel module will link against a kernel without 'option APIC_IO'.
2495 * XXX - This is a gross hack.
2498 apic_register_enumerator(struct apic_enumerator *enumerator)
2503 ioapic_create(uintptr_t addr, int32_t id, int intbase)
2509 ioapic_disable_pin(void *cookie, u_int pin)
2515 ioapic_enable_mixed_mode(void)
2520 ioapic_get_vector(void *cookie, u_int pin)
2526 ioapic_register(void *cookie)
2531 ioapic_remap_vector(void *cookie, u_int pin, int vector)
2537 ioapic_set_extint(void *cookie, u_int pin)
2543 ioapic_set_nmi(void *cookie, u_int pin)
2549 ioapic_set_polarity(void *cookie, u_int pin, char activehi)
2555 ioapic_set_triggermode(void *cookie, u_int pin, char edgetrigger)
2561 lapic_create(u_int apic_id, int boot_cpu)
2566 lapic_init(uintptr_t addr)
2571 lapic_set_lvt_mode(u_int apic_id, u_int lvt, u_int32_t mode)
2577 lapic_set_lvt_polarity(u_int apic_id, u_int lvt, u_char activehi)
2583 lapic_set_lvt_triggermode(u_int apic_id, u_int lvt, u_char edgetrigger)
2588 #include <sys/disklabel.h>
2591 * Determine the size of the transfer, and make sure it is
2592 * within the boundaries of the partition. Adjust transfer
2593 * if needed, and signal errors or early completion.
2596 bounds_check_with_label(struct buf *bp, struct disklabel *lp, int wlabel)
2598 struct partition *p = lp->d_partitions + dkpart(bp->b_dev);
2599 int labelsect = lp->d_partitions[0].p_offset;
2600 int maxsz = p->p_size,
2601 sz = (bp->b_bcount + DEV_BSIZE - 1) >> DEV_BSHIFT;
2603 /* overwriting disk label ? */
2604 /* XXX should also protect bootstrap in first 8K */
2605 if (bp->b_blkno + p->p_offset <= LABELSECTOR + labelsect &&
2606 #if LABELSECTOR != 0
2607 bp->b_blkno + p->p_offset + sz > LABELSECTOR + labelsect &&
2609 (bp->b_flags & B_READ) == 0 && wlabel == 0) {
2610 bp->b_error = EROFS;
2614 #if defined(DOSBBSECTOR) && defined(notyet)
2615 /* overwriting master boot record? */
2616 if (bp->b_blkno + p->p_offset <= DOSBBSECTOR &&
2617 (bp->b_flags & B_READ) == 0 && wlabel == 0) {
2618 bp->b_error = EROFS;
2623 /* beyond partition? */
2624 if (bp->b_blkno < 0 || bp->b_blkno + sz > maxsz) {
2625 /* if exactly at end of disk, return an EOF */
2626 if (bp->b_blkno == maxsz) {
2627 bp->b_resid = bp->b_bcount;
2630 /* or truncate if part of it fits */
2631 sz = maxsz - bp->b_blkno;
2633 bp->b_error = EINVAL;
2636 bp->b_bcount = sz << DEV_BSHIFT;
2639 bp->b_pblkno = bp->b_blkno + p->p_offset;
2643 bp->b_flags |= B_ERROR;
2650 * Provide inb() and outb() as functions. They are normally only
2651 * available as macros calling inlined functions, thus cannot be
2652 * called inside DDB.
2654 * The actual code is stolen from <machine/cpufunc.h>, and de-inlined.
2660 /* silence compiler warnings */
2662 void outb(u_int, u_char);
2669 * We use %%dx and not %1 here because i/o is done at %dx and not at
2670 * %edx, while gcc generates inferior code (movw instead of movl)
2671 * if we tell it to load (u_short) port.
2673 __asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port));
2678 outb(u_int port, u_char data)
2682 * Use an unnecessary assignment to help gcc's register allocator.
2683 * This make a large difference for gcc-1.40 and a tiny difference
2684 * for gcc-2.6.0. For gcc-1.40, al had to be ``asm("ax")'' for
2685 * best results. gcc-2.6.0 can't handle this.
2688 __asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port));
2695 #include "opt_cpu.h"
2699 * initialize all the SMP locks
2702 /* critical region around IO APIC, apic_imen */
2703 struct spinlock imen_spinlock;
2705 /* Make FAST_INTR() routines sequential */
2706 struct spinlock fast_intr_spinlock;
2708 /* critical region for old style disable_intr/enable_intr */
2709 struct spinlock mpintr_spinlock;
2711 /* critical region around INTR() routines */
2712 struct spinlock intr_spinlock;
2714 /* lock region used by kernel profiling */
2715 struct spinlock mcount_spinlock;
2717 /* locks com (tty) data/hardware accesses: a FASTINTR() */
2718 struct spinlock com_spinlock;
2720 /* locks kernel printfs */
2721 struct spinlock cons_spinlock;
2723 /* lock regions around the clock hardware */
2724 struct spinlock clock_spinlock;
2726 /* lock around the MP rendezvous */
2727 struct spinlock smp_rv_spinlock;
2733 * mp_lock = 0; BSP already owns the MP lock
2736 * Get the initial mp_lock with a count of 1 for the BSP.
2737 * This uses a LOGICAL cpu ID, ie BSP == 0.
2740 cpu_get_initial_mplock();
2743 spin_lock_init(&mcount_spinlock);
2744 spin_lock_init(&fast_intr_spinlock);
2745 spin_lock_init(&intr_spinlock);
2746 spin_lock_init(&mpintr_spinlock);
2747 spin_lock_init(&imen_spinlock);
2748 spin_lock_init(&smp_rv_spinlock);
2749 spin_lock_init(&com_spinlock);
2750 spin_lock_init(&clock_spinlock);
2751 spin_lock_init(&cons_spinlock);
2753 /* our token pool needs to work early */
2754 lwkt_token_pool_init();