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 $
42 #include "use_ether.h"
45 #include "opt_atalk.h"
46 #include "opt_compat.h"
49 #include "opt_directio.h"
52 #include "opt_maxmem.h"
53 #include "opt_msgbuf.h"
54 #include "opt_perfmon.h"
56 #include "opt_userconfig.h"
58 #include <sys/param.h>
59 #include <sys/systm.h>
60 #include <sys/sysproto.h>
61 #include <sys/signalvar.h>
62 #include <sys/kernel.h>
63 #include <sys/linker.h>
64 #include <sys/malloc.h>
68 #include <sys/reboot.h>
70 #include <sys/msgbuf.h>
71 #include <sys/sysent.h>
72 #include <sys/sysctl.h>
73 #include <sys/vmmeter.h>
75 #include <sys/upcall.h>
76 #include <sys/usched.h>
80 #include <vm/vm_param.h>
82 #include <vm/vm_kern.h>
83 #include <vm/vm_object.h>
84 #include <vm/vm_page.h>
85 #include <vm/vm_map.h>
86 #include <vm/vm_pager.h>
87 #include <vm/vm_extern.h>
89 #include <sys/thread2.h>
90 #include <sys/mplock2.h>
98 #include <machine/cpu.h>
99 #include <machine/clock.h>
100 #include <machine/specialreg.h>
101 #include <machine/bootinfo.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 */
105 #include <machine/smp.h>
107 #include <machine/perfmon.h>
109 #include <machine/cputypes.h>
112 #include <bus/isa/isa_device.h>
114 #include <machine_base/isa/intr_machdep.h>
115 #include <bus/isa/rtc.h>
116 #include <machine/vm86.h>
117 #include <sys/random.h>
118 #include <sys/ptrace.h>
119 #include <machine/sigframe.h>
121 #define PHYSMAP_ENTRIES 10
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_BOOT2_SMP, SI_ORDER_FIRST, cpu_startup, NULL)
143 int _udatasel, _ucodesel;
146 int64_t tsc_offsets[MAXCPU];
148 int64_t tsc_offsets[1];
151 #if defined(SWTCH_OPTIM_STATS)
152 extern int swtch_optim_stats;
153 SYSCTL_INT(_debug, OID_AUTO, swtch_optim_stats,
154 CTLFLAG_RD, &swtch_optim_stats, 0, "");
155 SYSCTL_INT(_debug, OID_AUTO, tlb_flush_count,
156 CTLFLAG_RD, &tlb_flush_count, 0, "");
161 u_long ebda_addr = 0;
164 sysctl_hw_physmem(SYSCTL_HANDLER_ARGS)
166 int error = sysctl_handle_int(oidp, 0, ctob(physmem), req);
170 SYSCTL_PROC(_hw, HW_PHYSMEM, physmem, CTLTYPE_INT|CTLFLAG_RD,
171 0, 0, sysctl_hw_physmem, "IU", "");
174 sysctl_hw_usermem(SYSCTL_HANDLER_ARGS)
176 int error = sysctl_handle_int(oidp, 0,
177 ctob(physmem - vmstats.v_wire_count), req);
181 SYSCTL_PROC(_hw, HW_USERMEM, usermem, CTLTYPE_INT|CTLFLAG_RD,
182 0, 0, sysctl_hw_usermem, "IU", "");
185 sysctl_hw_availpages(SYSCTL_HANDLER_ARGS)
187 int error = sysctl_handle_int(oidp, 0,
188 i386_btop(avail_end - avail_start), req);
192 SYSCTL_PROC(_hw, OID_AUTO, availpages, CTLTYPE_INT|CTLFLAG_RD,
193 0, 0, sysctl_hw_availpages, "I", "");
195 vm_paddr_t Maxmem = 0;
197 vm_paddr_t phys_avail[PHYSMAP_ENTRIES*2+2];
198 vm_paddr_t dump_avail[PHYSMAP_ENTRIES*2+2];
201 static vm_offset_t buffer_sva, buffer_eva;
202 vm_offset_t clean_sva, clean_eva;
203 static vm_offset_t pager_sva, pager_eva;
204 static struct trapframe proc0_tf;
207 cpu_startup(void *dummy)
211 vm_offset_t firstaddr;
213 if (boothowto & RB_VERBOSE)
217 * Good {morning,afternoon,evening,night}.
219 kprintf("%s", version);
222 panicifcpuunsupported();
226 kprintf("real memory = %ju (%ju MB)\n",
227 (intmax_t)ptoa(Maxmem), (intmax_t)ptoa(Maxmem) / 1024 / 1024);
229 * Display any holes after the first chunk of extended memory.
234 kprintf("Physical memory chunk(s):\n");
235 for (indx = 0; phys_avail[indx + 1] != 0; indx += 2) {
236 vm_paddr_t size1 = phys_avail[indx + 1] - phys_avail[indx];
238 kprintf("0x%08llx - 0x%08llx, %llu bytes (%llu pages)\n",
239 phys_avail[indx], phys_avail[indx + 1] - 1, size1,
245 * Allocate space for system data structures.
246 * The first available kernel virtual address is in "v".
247 * As pages of kernel virtual memory are allocated, "v" is incremented.
248 * As pages of memory are allocated and cleared,
249 * "firstaddr" is incremented.
250 * An index into the kernel page table corresponding to the
251 * virtual memory address maintained in "v" is kept in "mapaddr".
255 * Make two passes. The first pass calculates how much memory is
256 * needed and allocates it. The second pass assigns virtual
257 * addresses to the various data structures.
261 v = (caddr_t)firstaddr;
263 #define valloc(name, type, num) \
264 (name) = (type *)v; v = (caddr_t)((name)+(num))
265 #define valloclim(name, type, num, lim) \
266 (name) = (type *)v; v = (caddr_t)((lim) = ((name)+(num)))
269 * The nominal buffer size (and minimum KVA allocation) is BKVASIZE.
270 * For the first 64MB of ram nominally allocate sufficient buffers to
271 * cover 1/4 of our ram. Beyond the first 64MB allocate additional
272 * buffers to cover 1/20 of our ram over 64MB. When auto-sizing
273 * the buffer cache we limit the eventual kva reservation to
276 * factor represents the 1/4 x ram conversion.
279 int factor = 4 * BKVASIZE / 1024;
280 int kbytes = physmem * (PAGE_SIZE / 1024);
284 nbuf += min((kbytes - 4096) / factor, 65536 / factor);
286 nbuf += (kbytes - 65536) * 2 / (factor * 5);
287 if (maxbcache && nbuf > maxbcache / BKVASIZE)
288 nbuf = maxbcache / BKVASIZE;
292 * Do not allow the buffer_map to be more then 1/2 the size of the
295 if (nbuf > (virtual_end - virtual_start) / (BKVASIZE * 2)) {
296 nbuf = (virtual_end - virtual_start) / (BKVASIZE * 2);
297 kprintf("Warning: nbufs capped at %d\n", nbuf);
300 nswbuf = max(min(nbuf/4, 256), 16);
302 if (nswbuf < NSWBUF_MIN)
309 valloc(swbuf, struct buf, nswbuf);
310 valloc(buf, struct buf, nbuf);
313 * End of first pass, size has been calculated so allocate memory
315 if (firstaddr == 0) {
316 size = (vm_size_t)(v - firstaddr);
317 firstaddr = kmem_alloc(&kernel_map, round_page(size));
319 panic("startup: no room for tables");
324 * End of second pass, addresses have been assigned
326 if ((vm_size_t)(v - firstaddr) != size)
327 panic("startup: table size inconsistency");
329 kmem_suballoc(&kernel_map, &clean_map, &clean_sva, &clean_eva,
330 (nbuf*BKVASIZE) + (nswbuf*MAXPHYS) + pager_map_size);
331 kmem_suballoc(&clean_map, &buffer_map, &buffer_sva, &buffer_eva,
333 buffer_map.system_map = 1;
334 kmem_suballoc(&clean_map, &pager_map, &pager_sva, &pager_eva,
335 (nswbuf*MAXPHYS) + pager_map_size);
336 pager_map.system_map = 1;
338 #if defined(USERCONFIG)
340 cninit(); /* the preferred console may have changed */
343 kprintf("avail memory = %ju (%ju MB)\n",
344 (intmax_t)ptoa(vmstats.v_free_count),
345 (intmax_t)ptoa(vmstats.v_free_count) / 1024 / 1024);
348 * Set up buffers, so they can be used to read disk labels.
351 vm_pager_bufferinit();
355 * OK, enough kmem_alloc/malloc state should be up, lets get on with it!
357 mp_start(); /* fire up the APs and APICs */
364 * Send an interrupt to process.
366 * Stack is set up to allow sigcode stored
367 * at top to call routine, followed by kcall
368 * to sigreturn routine below. After sigreturn
369 * resets the signal mask, the stack, and the
370 * frame pointer, it returns to the user
374 sendsig(sig_t catcher, int sig, sigset_t *mask, u_long code)
376 struct lwp *lp = curthread->td_lwp;
377 struct proc *p = lp->lwp_proc;
378 struct trapframe *regs;
379 struct sigacts *psp = p->p_sigacts;
380 struct sigframe sf, *sfp;
383 regs = lp->lwp_md.md_regs;
384 oonstack = (lp->lwp_sigstk.ss_flags & SS_ONSTACK) ? 1 : 0;
386 /* save user context */
387 bzero(&sf, sizeof(struct sigframe));
388 sf.sf_uc.uc_sigmask = *mask;
389 sf.sf_uc.uc_stack = lp->lwp_sigstk;
390 sf.sf_uc.uc_mcontext.mc_onstack = oonstack;
391 bcopy(regs, &sf.sf_uc.uc_mcontext.mc_gs, sizeof(struct trapframe));
393 /* make the size of the saved context visible to userland */
394 sf.sf_uc.uc_mcontext.mc_len = sizeof(sf.sf_uc.uc_mcontext);
396 /* save mailbox pending state for syscall interlock semantics */
397 if (p->p_flag & P_MAILBOX)
398 sf.sf_uc.uc_mcontext.mc_xflags |= PGEX_MAILBOX;
400 /* Allocate and validate space for the signal handler context. */
401 if ((lp->lwp_flag & LWP_ALTSTACK) != 0 && !oonstack &&
402 SIGISMEMBER(psp->ps_sigonstack, sig)) {
403 sfp = (struct sigframe *)(lp->lwp_sigstk.ss_sp +
404 lp->lwp_sigstk.ss_size - sizeof(struct sigframe));
405 lp->lwp_sigstk.ss_flags |= SS_ONSTACK;
407 sfp = (struct sigframe *)regs->tf_esp - 1;
410 /* Translate the signal is appropriate */
411 if (p->p_sysent->sv_sigtbl) {
412 if (sig <= p->p_sysent->sv_sigsize)
413 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)];
416 /* Build the argument list for the signal handler. */
418 sf.sf_ucontext = (register_t)&sfp->sf_uc;
419 if (SIGISMEMBER(psp->ps_siginfo, sig)) {
420 /* Signal handler installed with SA_SIGINFO. */
421 sf.sf_siginfo = (register_t)&sfp->sf_si;
422 sf.sf_ahu.sf_action = (__siginfohandler_t *)catcher;
424 /* fill siginfo structure */
425 sf.sf_si.si_signo = sig;
426 sf.sf_si.si_code = code;
427 sf.sf_si.si_addr = (void*)regs->tf_err;
430 /* Old FreeBSD-style arguments. */
431 sf.sf_siginfo = code;
432 sf.sf_addr = regs->tf_err;
433 sf.sf_ahu.sf_handler = catcher;
437 * If we're a vm86 process, we want to save the segment registers.
438 * We also change eflags to be our emulated eflags, not the actual
441 if (regs->tf_eflags & PSL_VM) {
442 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs;
443 struct vm86_kernel *vm86 = &lp->lwp_thread->td_pcb->pcb_ext->ext_vm86;
445 sf.sf_uc.uc_mcontext.mc_gs = tf->tf_vm86_gs;
446 sf.sf_uc.uc_mcontext.mc_fs = tf->tf_vm86_fs;
447 sf.sf_uc.uc_mcontext.mc_es = tf->tf_vm86_es;
448 sf.sf_uc.uc_mcontext.mc_ds = tf->tf_vm86_ds;
450 if (vm86->vm86_has_vme == 0)
451 sf.sf_uc.uc_mcontext.mc_eflags =
452 (tf->tf_eflags & ~(PSL_VIF | PSL_VIP)) |
453 (vm86->vm86_eflags & (PSL_VIF | PSL_VIP));
456 * Clear PSL_NT to inhibit T_TSSFLT faults on return from
457 * syscalls made by the signal handler. This just avoids
458 * wasting time for our lazy fixup of such faults. PSL_NT
459 * does nothing in vm86 mode, but vm86 programs can set it
460 * almost legitimately in probes for old cpu types.
462 tf->tf_eflags &= ~(PSL_VM | PSL_NT | PSL_VIF | PSL_VIP);
466 * Save the FPU state and reinit the FP unit
468 npxpush(&sf.sf_uc.uc_mcontext);
471 * Copy the sigframe out to the user's stack.
473 if (copyout(&sf, sfp, sizeof(struct sigframe)) != 0) {
475 * Something is wrong with the stack pointer.
476 * ...Kill the process.
481 regs->tf_esp = (int)sfp;
482 regs->tf_eip = PS_STRINGS - *(p->p_sysent->sv_szsigcode);
485 * i386 abi specifies that the direction flag must be cleared
488 regs->tf_eflags &= ~(PSL_T|PSL_D);
490 regs->tf_cs = _ucodesel;
491 regs->tf_ds = _udatasel;
492 regs->tf_es = _udatasel;
495 * Allow the signal handler to inherit %fs in addition to %gs as
496 * the userland program might be using both.
498 * However, if a T_PROTFLT occured the segment registers could be
499 * totally broken. They must be reset in order to be able to
500 * return to userland.
502 if (regs->tf_trapno == T_PROTFLT) {
503 regs->tf_fs = _udatasel;
504 regs->tf_gs = _udatasel;
506 regs->tf_ss = _udatasel;
510 * Sanitize the trapframe for a virtual kernel passing control to a custom
511 * VM context. Remove any items that would otherwise create a privilage
514 * XXX at the moment we allow userland to set the resume flag. Is this a
518 cpu_sanitize_frame(struct trapframe *frame)
520 frame->tf_cs = _ucodesel;
521 frame->tf_ds = _udatasel;
522 frame->tf_es = _udatasel; /* XXX allow userland this one too? */
524 frame->tf_fs = _udatasel;
525 frame->tf_gs = _udatasel;
527 frame->tf_ss = _udatasel;
528 frame->tf_eflags &= (PSL_RF | PSL_USERCHANGE);
529 frame->tf_eflags |= PSL_RESERVED_DEFAULT | PSL_I;
534 cpu_sanitize_tls(struct savetls *tls)
536 struct segment_descriptor *desc;
539 for (i = 0; i < NGTLS; ++i) {
541 if (desc->sd_dpl == 0 && desc->sd_type == 0)
543 if (desc->sd_def32 == 0)
545 if (desc->sd_type != SDT_MEMRWA)
547 if (desc->sd_dpl != SEL_UPL)
549 if (desc->sd_xx != 0 || desc->sd_p != 1)
556 * sigreturn(ucontext_t *sigcntxp)
558 * System call to cleanup state after a signal
559 * has been taken. Reset signal mask and
560 * stack state from context left by sendsig (above).
561 * Return to previous pc and psl as specified by
562 * context left by sendsig. Check carefully to
563 * make sure that the user has not modified the
564 * state to gain improper privileges.
568 #define EFL_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0)
569 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL)
572 sys_sigreturn(struct sigreturn_args *uap)
574 struct lwp *lp = curthread->td_lwp;
575 struct proc *p = lp->lwp_proc;
576 struct trapframe *regs;
584 * We have to copy the information into kernel space so userland
585 * can't modify it while we are sniffing it.
587 regs = lp->lwp_md.md_regs;
588 error = copyin(uap->sigcntxp, &uc, sizeof(uc));
592 eflags = ucp->uc_mcontext.mc_eflags;
594 if (eflags & PSL_VM) {
595 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs;
596 struct vm86_kernel *vm86;
599 * if pcb_ext == 0 or vm86_inited == 0, the user hasn't
600 * set up the vm86 area, and we can't enter vm86 mode.
602 if (lp->lwp_thread->td_pcb->pcb_ext == 0)
604 vm86 = &lp->lwp_thread->td_pcb->pcb_ext->ext_vm86;
605 if (vm86->vm86_inited == 0)
608 /* go back to user mode if both flags are set */
609 if ((eflags & PSL_VIP) && (eflags & PSL_VIF))
610 trapsignal(lp, SIGBUS, 0);
612 if (vm86->vm86_has_vme) {
613 eflags = (tf->tf_eflags & ~VME_USERCHANGE) |
614 (eflags & VME_USERCHANGE) | PSL_VM;
616 vm86->vm86_eflags = eflags; /* save VIF, VIP */
617 eflags = (tf->tf_eflags & ~VM_USERCHANGE) |
618 (eflags & VM_USERCHANGE) | PSL_VM;
620 bcopy(&ucp->uc_mcontext.mc_gs, tf, sizeof(struct trapframe));
621 tf->tf_eflags = eflags;
622 tf->tf_vm86_ds = tf->tf_ds;
623 tf->tf_vm86_es = tf->tf_es;
624 tf->tf_vm86_fs = tf->tf_fs;
625 tf->tf_vm86_gs = tf->tf_gs;
626 tf->tf_ds = _udatasel;
627 tf->tf_es = _udatasel;
629 tf->tf_fs = _udatasel;
630 tf->tf_gs = _udatasel;
634 * Don't allow users to change privileged or reserved flags.
637 * XXX do allow users to change the privileged flag PSL_RF.
638 * The cpu sets PSL_RF in tf_eflags for faults. Debuggers
639 * should sometimes set it there too. tf_eflags is kept in
640 * the signal context during signal handling and there is no
641 * other place to remember it, so the PSL_RF bit may be
642 * corrupted by the signal handler without us knowing.
643 * Corruption of the PSL_RF bit at worst causes one more or
644 * one less debugger trap, so allowing it is fairly harmless.
646 if (!EFL_SECURE(eflags & ~PSL_RF, regs->tf_eflags & ~PSL_RF)) {
647 kprintf("sigreturn: eflags = 0x%x\n", eflags);
652 * Don't allow users to load a valid privileged %cs. Let the
653 * hardware check for invalid selectors, excess privilege in
654 * other selectors, invalid %eip's and invalid %esp's.
656 cs = ucp->uc_mcontext.mc_cs;
657 if (!CS_SECURE(cs)) {
658 kprintf("sigreturn: cs = 0x%x\n", cs);
659 trapsignal(lp, SIGBUS, T_PROTFLT);
662 bcopy(&ucp->uc_mcontext.mc_gs, regs, sizeof(struct trapframe));
666 * Restore the FPU state from the frame
669 npxpop(&ucp->uc_mcontext);
672 * Merge saved signal mailbox pending flag to maintain interlock
673 * semantics against system calls.
675 if (ucp->uc_mcontext.mc_xflags & PGEX_MAILBOX)
676 p->p_flag |= P_MAILBOX;
678 if (ucp->uc_mcontext.mc_onstack & 1)
679 lp->lwp_sigstk.ss_flags |= SS_ONSTACK;
681 lp->lwp_sigstk.ss_flags &= ~SS_ONSTACK;
683 lp->lwp_sigmask = ucp->uc_sigmask;
684 SIG_CANTMASK(lp->lwp_sigmask);
690 * Stack frame on entry to function. %eax will contain the function vector,
691 * %ecx will contain the function data. flags, ecx, and eax will have
692 * already been pushed on the stack.
703 sendupcall(struct vmupcall *vu, int morepending)
705 struct lwp *lp = curthread->td_lwp;
706 struct trapframe *regs;
707 struct upcall upcall;
708 struct upc_frame upc_frame;
712 * If we are a virtual kernel running an emulated user process
713 * context, switch back to the virtual kernel context before
714 * trying to post the signal.
716 if (lp->lwp_vkernel && lp->lwp_vkernel->ve) {
717 lp->lwp_md.md_regs->tf_trapno = 0;
718 vkernel_trap(lp, lp->lwp_md.md_regs);
722 * Get the upcall data structure
724 if (copyin(lp->lwp_upcall, &upcall, sizeof(upcall)) ||
725 copyin((char *)upcall.upc_uthread + upcall.upc_critoff, &crit_count, sizeof(int))
728 kprintf("bad upcall address\n");
733 * If the data structure is already marked pending or has a critical
734 * section count, mark the data structure as pending and return
735 * without doing an upcall. vu_pending is left set.
737 if (upcall.upc_pending || crit_count >= vu->vu_pending) {
738 if (upcall.upc_pending < vu->vu_pending) {
739 upcall.upc_pending = vu->vu_pending;
740 copyout(&upcall.upc_pending, &lp->lwp_upcall->upc_pending,
741 sizeof(upcall.upc_pending));
747 * We can run this upcall now, clear vu_pending.
749 * Bump our critical section count and set or clear the
750 * user pending flag depending on whether more upcalls are
751 * pending. The user will be responsible for calling
752 * upc_dispatch(-1) to process remaining upcalls.
755 upcall.upc_pending = morepending;
757 copyout(&upcall.upc_pending, &lp->lwp_upcall->upc_pending,
758 sizeof(upcall.upc_pending));
759 copyout(&crit_count, (char *)upcall.upc_uthread + upcall.upc_critoff,
763 * Construct a stack frame and issue the upcall
765 regs = lp->lwp_md.md_regs;
766 upc_frame.eax = regs->tf_eax;
767 upc_frame.ecx = regs->tf_ecx;
768 upc_frame.edx = regs->tf_edx;
769 upc_frame.flags = regs->tf_eflags;
770 upc_frame.oldip = regs->tf_eip;
771 if (copyout(&upc_frame, (void *)(regs->tf_esp - sizeof(upc_frame)),
772 sizeof(upc_frame)) != 0) {
773 kprintf("bad stack on upcall\n");
775 regs->tf_eax = (register_t)vu->vu_func;
776 regs->tf_ecx = (register_t)vu->vu_data;
777 regs->tf_edx = (register_t)lp->lwp_upcall;
778 regs->tf_eip = (register_t)vu->vu_ctx;
779 regs->tf_esp -= sizeof(upc_frame);
784 * fetchupcall occurs in the context of a system call, which means that
785 * we have to return EJUSTRETURN in order to prevent eax and edx from
786 * being overwritten by the syscall return value.
788 * if vu is not NULL we return the new context in %edx, the new data in %ecx,
789 * and the function pointer in %eax.
792 fetchupcall(struct vmupcall *vu, int morepending, void *rsp)
794 struct upc_frame upc_frame;
795 struct lwp *lp = curthread->td_lwp;
796 struct trapframe *regs;
798 struct upcall upcall;
801 regs = lp->lwp_md.md_regs;
803 error = copyout(&morepending, &lp->lwp_upcall->upc_pending, sizeof(int));
807 * This jumps us to the next ready context.
810 error = copyin(lp->lwp_upcall, &upcall, sizeof(upcall));
813 error = copyin((char *)upcall.upc_uthread + upcall.upc_critoff, &crit_count, sizeof(int));
816 error = copyout(&crit_count, (char *)upcall.upc_uthread + upcall.upc_critoff, sizeof(int));
817 regs->tf_eax = (register_t)vu->vu_func;
818 regs->tf_ecx = (register_t)vu->vu_data;
819 regs->tf_edx = (register_t)lp->lwp_upcall;
820 regs->tf_eip = (register_t)vu->vu_ctx;
821 regs->tf_esp = (register_t)rsp;
824 * This returns us to the originally interrupted code.
826 error = copyin(rsp, &upc_frame, sizeof(upc_frame));
827 regs->tf_eax = upc_frame.eax;
828 regs->tf_ecx = upc_frame.ecx;
829 regs->tf_edx = upc_frame.edx;
830 regs->tf_eflags = (regs->tf_eflags & ~PSL_USERCHANGE) |
831 (upc_frame.flags & PSL_USERCHANGE);
832 regs->tf_eip = upc_frame.oldip;
833 regs->tf_esp = (register_t)((char *)rsp + sizeof(upc_frame));
842 * Machine dependent boot() routine
844 * I haven't seen anything to put here yet
845 * Possibly some stuff might be grafted back here from boot()
853 * Shutdown the CPU as much as possible
859 __asm__ __volatile("hlt");
863 * cpu_idle() represents the idle LWKT. You cannot return from this function
864 * (unless you want to blow things up!). Instead we look for runnable threads
865 * and loop or halt as appropriate. Giant is not held on entry to the thread.
867 * The main loop is entered with a critical section held, we must release
868 * the critical section before doing anything else. lwkt_switch() will
869 * check for pending interrupts due to entering and exiting its own
872 * Note on cpu_idle_hlt: On an SMP system we rely on a scheduler IPI
873 * to wake a HLTed cpu up. However, there are cases where the idlethread
874 * will be entered with the possibility that no IPI will occur and in such
875 * cases lwkt_switch() sets TDF_IDLE_NOHLT.
877 static int cpu_idle_hlt = 1;
878 static int cpu_idle_hltcnt;
879 static int cpu_idle_spincnt;
880 SYSCTL_INT(_machdep, OID_AUTO, cpu_idle_hlt, CTLFLAG_RW,
881 &cpu_idle_hlt, 0, "Idle loop HLT enable");
882 SYSCTL_INT(_machdep, OID_AUTO, cpu_idle_hltcnt, CTLFLAG_RW,
883 &cpu_idle_hltcnt, 0, "Idle loop entry halts");
884 SYSCTL_INT(_machdep, OID_AUTO, cpu_idle_spincnt, CTLFLAG_RW,
885 &cpu_idle_spincnt, 0, "Idle loop entry spins");
888 cpu_idle_default_hook(void)
891 * We must guarentee that hlt is exactly the instruction
894 __asm __volatile("sti; hlt");
897 /* Other subsystems (e.g., ACPI) can hook this later. */
898 void (*cpu_idle_hook)(void) = cpu_idle_default_hook;
903 struct thread *td = curthread;
906 KKASSERT(td->td_critcount == 0);
909 * See if there are any LWKTs ready to go.
914 * If we are going to halt call splz unconditionally after
915 * CLIing to catch any interrupt races. Note that we are
916 * at SPL0 and interrupts are enabled.
918 if (cpu_idle_hlt && !lwkt_runnable() &&
919 (td->td_flags & TDF_IDLE_NOHLT) == 0) {
920 __asm __volatile("cli");
922 if (!lwkt_runnable())
926 handle_cpu_contention_mask();
930 td->td_flags &= ~TDF_IDLE_NOHLT;
933 __asm __volatile("sti");
934 handle_cpu_contention_mask();
936 __asm __volatile("sti");
946 * This routine is called when the only runnable threads require
947 * the MP lock, and the scheduler couldn't get it. On a real cpu
948 * we let the scheduler spin.
951 handle_cpu_contention_mask(void)
955 mask = cpu_contention_mask;
957 if (mask && bsfl(mask) != mycpu->gd_cpuid) {
964 * This routine is called if a spinlock has been held through the
965 * exponential backoff period and is seriously contested. On a real cpu
969 cpu_spinlock_contested(void)
977 * Clear registers on exec
980 exec_setregs(u_long entry, u_long stack, u_long ps_strings)
982 struct thread *td = curthread;
983 struct lwp *lp = td->td_lwp;
984 struct pcb *pcb = td->td_pcb;
985 struct trapframe *regs = lp->lwp_md.md_regs;
987 /* was i386_user_cleanup() in NetBSD */
990 bzero((char *)regs, sizeof(struct trapframe));
991 regs->tf_eip = entry;
992 regs->tf_esp = stack;
993 regs->tf_eflags = PSL_USER | (regs->tf_eflags & PSL_T);
994 regs->tf_ss = _udatasel;
995 regs->tf_ds = _udatasel;
996 regs->tf_es = _udatasel;
997 regs->tf_fs = _udatasel;
998 regs->tf_gs = _udatasel;
999 regs->tf_cs = _ucodesel;
1001 /* PS_STRINGS value for BSD/OS binaries. It is 0 for non-BSD/OS. */
1002 regs->tf_ebx = ps_strings;
1005 * Reset the hardware debug registers if they were in use.
1006 * They won't have any meaning for the newly exec'd process.
1008 if (pcb->pcb_flags & PCB_DBREGS) {
1015 if (pcb == td->td_pcb) {
1017 * Clear the debug registers on the running
1018 * CPU, otherwise they will end up affecting
1019 * the next process we switch to.
1023 pcb->pcb_flags &= ~PCB_DBREGS;
1027 * Initialize the math emulator (if any) for the current process.
1028 * Actually, just clear the bit that says that the emulator has
1029 * been initialized. Initialization is delayed until the process
1030 * traps to the emulator (if it is done at all) mainly because
1031 * emulators don't provide an entry point for initialization.
1033 pcb->pcb_flags &= ~FP_SOFTFP;
1036 * note: do not set CR0_TS here. npxinit() must do it after clearing
1037 * gd_npxthread. Otherwise a preemptive interrupt thread may panic
1041 load_cr0(rcr0() | CR0_MP);
1044 /* Initialize the npx (if any) for the current process. */
1045 npxinit(__INITIAL_NPXCW__);
1050 * note: linux emulator needs edx to be 0x0 on entry, which is
1051 * handled in execve simply by setting the 64 bit syscall
1052 * return value to 0.
1062 cr0 |= CR0_NE; /* Done by npxinit() */
1063 cr0 |= CR0_MP | CR0_TS; /* Done at every execve() too. */
1064 cr0 |= CR0_WP | CR0_AM;
1070 sysctl_machdep_adjkerntz(SYSCTL_HANDLER_ARGS)
1073 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2,
1075 if (!error && req->newptr)
1080 SYSCTL_PROC(_machdep, CPU_ADJKERNTZ, adjkerntz, CTLTYPE_INT|CTLFLAG_RW,
1081 &adjkerntz, 0, sysctl_machdep_adjkerntz, "I", "");
1083 SYSCTL_INT(_machdep, CPU_DISRTCSET, disable_rtc_set,
1084 CTLFLAG_RW, &disable_rtc_set, 0, "");
1086 SYSCTL_STRUCT(_machdep, CPU_BOOTINFO, bootinfo,
1087 CTLFLAG_RD, &bootinfo, bootinfo, "");
1089 SYSCTL_INT(_machdep, CPU_WALLCLOCK, wall_cmos_clock,
1090 CTLFLAG_RW, &wall_cmos_clock, 0, "");
1092 extern u_long bootdev; /* not a cdev_t - encoding is different */
1093 SYSCTL_ULONG(_machdep, OID_AUTO, guessed_bootdev,
1094 CTLFLAG_RD, &bootdev, 0, "Boot device (not in cdev_t format)");
1097 * Initialize 386 and configure to run kernel
1101 * Initialize segments & interrupt table
1105 union descriptor gdt[NGDT * MAXCPU]; /* global descriptor table */
1106 static struct gate_descriptor idt0[NIDT];
1107 struct gate_descriptor *idt = &idt0[0]; /* interrupt descriptor table */
1108 union descriptor ldt[NLDT]; /* local descriptor table */
1110 /* table descriptors - used to load tables by cpu */
1111 struct region_descriptor r_gdt, r_idt;
1113 #if defined(I586_CPU) && !defined(NO_F00F_HACK)
1114 extern int has_f00f_bug;
1117 static struct i386tss dblfault_tss;
1118 static char dblfault_stack[PAGE_SIZE];
1120 extern struct user *proc0paddr;
1123 /* software prototypes -- in more palatable form */
1124 struct soft_segment_descriptor gdt_segs[] = {
1125 /* GNULL_SEL 0 Null Descriptor */
1126 { 0x0, /* segment base address */
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 /* GCODE_SEL 1 Code Descriptor for kernel */
1135 { 0x0, /* segment base address */
1136 0xfffff, /* length - all address space */
1137 SDT_MEMERA, /* 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 /* GDATA_SEL 2 Data Descriptor for kernel */
1144 { 0x0, /* segment base address */
1145 0xfffff, /* length - all address space */
1146 SDT_MEMRWA, /* segment type */
1147 0, /* segment descriptor priority level */
1148 1, /* segment descriptor present */
1150 1, /* default 32 vs 16 bit size */
1151 1 /* limit granularity (byte/page units)*/ },
1152 /* GPRIV_SEL 3 SMP Per-Processor Private Data Descriptor */
1153 { 0x0, /* segment base address */
1154 0xfffff, /* length - all address space */
1155 SDT_MEMRWA, /* segment type */
1156 0, /* segment descriptor priority level */
1157 1, /* segment descriptor present */
1159 1, /* default 32 vs 16 bit size */
1160 1 /* limit granularity (byte/page units)*/ },
1161 /* GPROC0_SEL 4 Proc 0 Tss Descriptor */
1163 0x0, /* segment base address */
1164 sizeof(struct i386tss)-1,/* length - all address space */
1165 SDT_SYS386TSS, /* segment type */
1166 0, /* segment descriptor priority level */
1167 1, /* segment descriptor present */
1169 0, /* unused - default 32 vs 16 bit size */
1170 0 /* limit granularity (byte/page units)*/ },
1171 /* GLDT_SEL 5 LDT Descriptor */
1172 { (int) ldt, /* segment base address */
1173 sizeof(ldt)-1, /* length - all address space */
1174 SDT_SYSLDT, /* segment type */
1175 SEL_UPL, /* segment descriptor priority level */
1176 1, /* segment descriptor present */
1178 0, /* unused - default 32 vs 16 bit size */
1179 0 /* limit granularity (byte/page units)*/ },
1180 /* GUSERLDT_SEL 6 User LDT Descriptor per process */
1181 { (int) ldt, /* segment base address */
1182 (512 * sizeof(union descriptor)-1), /* length */
1183 SDT_SYSLDT, /* segment type */
1184 0, /* segment descriptor priority level */
1185 1, /* segment descriptor present */
1187 0, /* unused - default 32 vs 16 bit size */
1188 0 /* limit granularity (byte/page units)*/ },
1189 /* GTGATE_SEL 7 Null Descriptor - Placeholder */
1190 { 0x0, /* segment base address */
1191 0x0, /* length - all address space */
1192 0, /* segment type */
1193 0, /* segment descriptor priority level */
1194 0, /* segment descriptor present */
1196 0, /* default 32 vs 16 bit size */
1197 0 /* limit granularity (byte/page units)*/ },
1198 /* GBIOSLOWMEM_SEL 8 BIOS access to realmode segment 0x40, must be #8 in GDT */
1199 { 0x400, /* segment base address */
1200 0xfffff, /* length */
1201 SDT_MEMRWA, /* segment type */
1202 0, /* segment descriptor priority level */
1203 1, /* segment descriptor present */
1205 1, /* default 32 vs 16 bit size */
1206 1 /* limit granularity (byte/page units)*/ },
1207 /* GPANIC_SEL 9 Panic Tss Descriptor */
1208 { (int) &dblfault_tss, /* segment base address */
1209 sizeof(struct i386tss)-1,/* length - all address space */
1210 SDT_SYS386TSS, /* segment type */
1211 0, /* segment descriptor priority level */
1212 1, /* segment descriptor present */
1214 0, /* unused - default 32 vs 16 bit size */
1215 0 /* limit granularity (byte/page units)*/ },
1216 /* GBIOSCODE32_SEL 10 BIOS 32-bit interface (32bit Code) */
1217 { 0, /* segment base address (overwritten) */
1218 0xfffff, /* length */
1219 SDT_MEMERA, /* segment type */
1220 0, /* segment descriptor priority level */
1221 1, /* segment descriptor present */
1223 0, /* default 32 vs 16 bit size */
1224 1 /* limit granularity (byte/page units)*/ },
1225 /* GBIOSCODE16_SEL 11 BIOS 32-bit interface (16bit Code) */
1226 { 0, /* segment base address (overwritten) */
1227 0xfffff, /* length */
1228 SDT_MEMERA, /* segment type */
1229 0, /* segment descriptor priority level */
1230 1, /* segment descriptor present */
1232 0, /* default 32 vs 16 bit size */
1233 1 /* limit granularity (byte/page units)*/ },
1234 /* GBIOSDATA_SEL 12 BIOS 32-bit interface (Data) */
1235 { 0, /* segment base address (overwritten) */
1236 0xfffff, /* length */
1237 SDT_MEMRWA, /* segment type */
1238 0, /* segment descriptor priority level */
1239 1, /* segment descriptor present */
1241 1, /* default 32 vs 16 bit size */
1242 1 /* limit granularity (byte/page units)*/ },
1243 /* GBIOSUTIL_SEL 13 BIOS 16-bit interface (Utility) */
1244 { 0, /* segment base address (overwritten) */
1245 0xfffff, /* length */
1246 SDT_MEMRWA, /* segment type */
1247 0, /* segment descriptor priority level */
1248 1, /* segment descriptor present */
1250 0, /* default 32 vs 16 bit size */
1251 1 /* limit granularity (byte/page units)*/ },
1252 /* GBIOSARGS_SEL 14 BIOS 16-bit interface (Arguments) */
1253 { 0, /* segment base address (overwritten) */
1254 0xfffff, /* length */
1255 SDT_MEMRWA, /* segment type */
1256 0, /* segment descriptor priority level */
1257 1, /* segment descriptor present */
1259 0, /* default 32 vs 16 bit size */
1260 1 /* limit granularity (byte/page units)*/ },
1261 /* GTLS_START 15 TLS */
1262 { 0x0, /* segment base address */
1264 0, /* segment type */
1265 0, /* segment descriptor priority level */
1266 0, /* segment descriptor present */
1268 0, /* default 32 vs 16 bit size */
1269 0 /* limit granularity (byte/page units)*/ },
1270 /* GTLS_START+1 16 TLS */
1271 { 0x0, /* segment base address */
1273 0, /* segment type */
1274 0, /* segment descriptor priority level */
1275 0, /* segment descriptor present */
1277 0, /* default 32 vs 16 bit size */
1278 0 /* limit granularity (byte/page units)*/ },
1279 /* GTLS_END 17 TLS */
1280 { 0x0, /* segment base address */
1282 0, /* segment type */
1283 0, /* segment descriptor priority level */
1284 0, /* segment descriptor present */
1286 0, /* default 32 vs 16 bit size */
1287 0 /* limit granularity (byte/page units)*/ },
1290 static struct soft_segment_descriptor ldt_segs[] = {
1291 /* Null Descriptor - overwritten by call gate */
1292 { 0x0, /* segment base address */
1293 0x0, /* length - all address space */
1294 0, /* segment type */
1295 0, /* segment descriptor priority level */
1296 0, /* segment descriptor present */
1298 0, /* default 32 vs 16 bit size */
1299 0 /* limit granularity (byte/page units)*/ },
1300 /* Null Descriptor - overwritten by call gate */
1301 { 0x0, /* segment base address */
1302 0x0, /* length - all address space */
1303 0, /* segment type */
1304 0, /* segment descriptor priority level */
1305 0, /* segment descriptor present */
1307 0, /* default 32 vs 16 bit size */
1308 0 /* limit granularity (byte/page units)*/ },
1309 /* Null Descriptor - overwritten by call gate */
1310 { 0x0, /* segment base address */
1311 0x0, /* length - all address space */
1312 0, /* segment type */
1313 0, /* segment descriptor priority level */
1314 0, /* segment descriptor present */
1316 0, /* default 32 vs 16 bit size */
1317 0 /* limit granularity (byte/page units)*/ },
1318 /* Code Descriptor for user */
1319 { 0x0, /* segment base address */
1320 0xfffff, /* length - all address space */
1321 SDT_MEMERA, /* segment type */
1322 SEL_UPL, /* segment descriptor priority level */
1323 1, /* segment descriptor present */
1325 1, /* default 32 vs 16 bit size */
1326 1 /* limit granularity (byte/page units)*/ },
1327 /* Null Descriptor - overwritten by call gate */
1328 { 0x0, /* segment base address */
1329 0x0, /* length - all address space */
1330 0, /* segment type */
1331 0, /* segment descriptor priority level */
1332 0, /* segment descriptor present */
1334 0, /* default 32 vs 16 bit size */
1335 0 /* limit granularity (byte/page units)*/ },
1336 /* Data 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)*/ },
1348 setidt(int idx, inthand_t *func, int typ, int dpl, int selec)
1350 struct gate_descriptor *ip;
1353 ip->gd_looffset = (int)func;
1354 ip->gd_selector = selec;
1360 ip->gd_hioffset = ((int)func)>>16 ;
1363 #define IDTVEC(name) __CONCAT(X,name)
1366 IDTVEC(div), IDTVEC(dbg), IDTVEC(nmi), IDTVEC(bpt), IDTVEC(ofl),
1367 IDTVEC(bnd), IDTVEC(ill), IDTVEC(dna), IDTVEC(fpusegm),
1368 IDTVEC(tss), IDTVEC(missing), IDTVEC(stk), IDTVEC(prot),
1369 IDTVEC(page), IDTVEC(mchk), IDTVEC(fpu), IDTVEC(align),
1370 IDTVEC(xmm), IDTVEC(syscall),
1373 IDTVEC(int0x80_syscall);
1375 #ifdef DEBUG_INTERRUPTS
1376 extern inthand_t *Xrsvdary[256];
1380 sdtossd(struct segment_descriptor *sd, struct soft_segment_descriptor *ssd)
1382 ssd->ssd_base = (sd->sd_hibase << 24) | sd->sd_lobase;
1383 ssd->ssd_limit = (sd->sd_hilimit << 16) | sd->sd_lolimit;
1384 ssd->ssd_type = sd->sd_type;
1385 ssd->ssd_dpl = sd->sd_dpl;
1386 ssd->ssd_p = sd->sd_p;
1387 ssd->ssd_def32 = sd->sd_def32;
1388 ssd->ssd_gran = sd->sd_gran;
1392 * Populate the (physmap) array with base/bound pairs describing the
1393 * available physical memory in the system, then test this memory and
1394 * build the phys_avail array describing the actually-available memory.
1396 * If we cannot accurately determine the physical memory map, then use
1397 * value from the 0xE801 call, and failing that, the RTC.
1399 * Total memory size may be set by the kernel environment variable
1400 * hw.physmem or the compile-time define MAXMEM.
1403 getmemsize(int first)
1405 int i, physmap_idx, pa_indx, da_indx;
1407 u_int basemem, extmem;
1408 struct vm86frame vmf;
1409 struct vm86context vmc;
1411 vm_offset_t physmap[PHYSMAP_ENTRIES*2];
1419 quad_t dcons_addr, dcons_size;
1421 bzero(&vmf, sizeof(struct vm86frame));
1422 bzero(physmap, sizeof(physmap));
1426 * Some newer BIOSes has broken INT 12H implementation which cause
1427 * kernel panic immediately. In this case, we need to scan SMAP
1428 * with INT 15:E820 first, then determine base memory size.
1431 TUNABLE_INT_FETCH("hw.hasbrokenint12", &hasbrokenint12);
1432 if (hasbrokenint12) {
1437 * Perform "base memory" related probes & setup. If we get a crazy
1438 * value give the bios some scribble space just in case.
1440 vm86_intcall(0x12, &vmf);
1441 basemem = vmf.vmf_ax;
1442 if (basemem > 640) {
1443 kprintf("Preposterous BIOS basemem of %uK, "
1444 "truncating to < 640K\n", basemem);
1449 * XXX if biosbasemem is now < 640, there is a `hole'
1450 * between the end of base memory and the start of
1451 * ISA memory. The hole may be empty or it may
1452 * contain BIOS code or data. Map it read/write so
1453 * that the BIOS can write to it. (Memory from 0 to
1454 * the physical end of the kernel is mapped read-only
1455 * to begin with and then parts of it are remapped.
1456 * The parts that aren't remapped form holes that
1457 * remain read-only and are unused by the kernel.
1458 * The base memory area is below the physical end of
1459 * the kernel and right now forms a read-only hole.
1460 * The part of it from PAGE_SIZE to
1461 * (trunc_page(biosbasemem * 1024) - 1) will be
1462 * remapped and used by the kernel later.)
1464 * This code is similar to the code used in
1465 * pmap_mapdev, but since no memory needs to be
1466 * allocated we simply change the mapping.
1468 for (pa = trunc_page(basemem * 1024);
1469 pa < ISA_HOLE_START; pa += PAGE_SIZE) {
1470 pte = vtopte(pa + KERNBASE);
1471 *pte = pa | PG_RW | PG_V;
1475 * if basemem != 640, map pages r/w into vm86 page table so
1476 * that the bios can scribble on it.
1479 for (i = basemem / 4; i < 160; i++)
1480 pte[i] = (i << PAGE_SHIFT) | PG_V | PG_RW | PG_U;
1484 * map page 1 R/W into the kernel page table so we can use it
1485 * as a buffer. The kernel will unmap this page later.
1487 pte = vtopte(KERNBASE + (1 << PAGE_SHIFT));
1488 *pte = (1 << PAGE_SHIFT) | PG_RW | PG_V;
1491 * get memory map with INT 15:E820
1493 #define SMAPSIZ sizeof(*smap)
1494 #define SMAP_SIG 0x534D4150 /* 'SMAP' */
1497 smap = (void *)vm86_addpage(&vmc, 1, KERNBASE + (1 << PAGE_SHIFT));
1498 vm86_getptr(&vmc, (vm_offset_t)smap, &vmf.vmf_es, &vmf.vmf_di);
1503 vmf.vmf_eax = 0xE820;
1504 vmf.vmf_edx = SMAP_SIG;
1505 vmf.vmf_ecx = SMAPSIZ;
1506 i = vm86_datacall(0x15, &vmf, &vmc);
1507 if (i || vmf.vmf_eax != SMAP_SIG)
1509 if (boothowto & RB_VERBOSE)
1510 kprintf("SMAP type=%02x base=%08x %08x len=%08x %08x\n",
1512 *(u_int32_t *)((char *)&smap->base + 4),
1513 (u_int32_t)smap->base,
1514 *(u_int32_t *)((char *)&smap->length + 4),
1515 (u_int32_t)smap->length);
1517 if (smap->type != 0x01)
1520 if (smap->length == 0)
1523 if (smap->base >= 0xffffffff) {
1524 kprintf("%ju MB of memory above 4GB ignored\n",
1525 (uintmax_t)(smap->length / 1024 / 1024));
1529 for (i = 0; i <= physmap_idx; i += 2) {
1530 if (smap->base < physmap[i + 1]) {
1531 if (boothowto & RB_VERBOSE)
1533 "Overlapping or non-montonic memory region, ignoring second region\n");
1538 if (smap->base == physmap[physmap_idx + 1]) {
1539 physmap[physmap_idx + 1] += smap->length;
1544 if (physmap_idx == PHYSMAP_ENTRIES*2) {
1546 "Too many segments in the physical address map, giving up\n");
1549 physmap[physmap_idx] = smap->base;
1550 physmap[physmap_idx + 1] = smap->base + smap->length;
1552 ; /* fix GCC3.x warning */
1553 } while (vmf.vmf_ebx != 0);
1556 * Perform "base memory" related probes & setup based on SMAP
1559 for (i = 0; i <= physmap_idx; i += 2) {
1560 if (physmap[i] == 0x00000000) {
1561 basemem = physmap[i + 1] / 1024;
1570 if (basemem > 640) {
1571 kprintf("Preposterous BIOS basemem of %uK, truncating to 640K\n",
1576 for (pa = trunc_page(basemem * 1024);
1577 pa < ISA_HOLE_START; pa += PAGE_SIZE) {
1578 pte = vtopte(pa + KERNBASE);
1579 *pte = pa | PG_RW | PG_V;
1583 for (i = basemem / 4; i < 160; i++)
1584 pte[i] = (i << PAGE_SHIFT) | PG_V | PG_RW | PG_U;
1587 if (physmap[1] != 0)
1591 * If we failed above, try memory map with INT 15:E801
1593 vmf.vmf_ax = 0xE801;
1594 if (vm86_intcall(0x15, &vmf) == 0) {
1595 extmem = vmf.vmf_cx + vmf.vmf_dx * 64;
1599 vm86_intcall(0x15, &vmf);
1600 extmem = vmf.vmf_ax;
1603 * Prefer the RTC value for extended memory.
1605 extmem = rtcin(RTC_EXTLO) + (rtcin(RTC_EXTHI) << 8);
1610 * Special hack for chipsets that still remap the 384k hole when
1611 * there's 16MB of memory - this really confuses people that
1612 * are trying to use bus mastering ISA controllers with the
1613 * "16MB limit"; they only have 16MB, but the remapping puts
1614 * them beyond the limit.
1616 * If extended memory is between 15-16MB (16-17MB phys address range),
1619 if ((extmem > 15 * 1024) && (extmem < 16 * 1024))
1623 physmap[1] = basemem * 1024;
1625 physmap[physmap_idx] = 0x100000;
1626 physmap[physmap_idx + 1] = physmap[physmap_idx] + extmem * 1024;
1630 * Now, physmap contains a map of physical memory.
1634 /* make hole for AP bootstrap code YYY */
1635 physmap[1] = mp_bootaddress(physmap[1]);
1637 /* Save EBDA address, if any */
1638 ebda_addr = (u_long)(*(u_short *)(KERNBASE + 0x40e));
1643 * Maxmem isn't the "maximum memory", it's one larger than the
1644 * highest page of the physical address space. It should be
1645 * called something like "Maxphyspage". We may adjust this
1646 * based on ``hw.physmem'' and the results of the memory test.
1648 Maxmem = atop(physmap[physmap_idx + 1]);
1651 Maxmem = MAXMEM / 4;
1654 if (kgetenv_quad("hw.physmem", &maxmem))
1655 Maxmem = atop(maxmem);
1657 if (atop(physmap[physmap_idx + 1]) != Maxmem &&
1658 (boothowto & RB_VERBOSE))
1659 kprintf("Physical memory use set to %lluK\n", Maxmem * 4);
1662 * If Maxmem has been increased beyond what the system has detected,
1663 * extend the last memory segment to the new limit.
1665 if (atop(physmap[physmap_idx + 1]) < Maxmem)
1666 physmap[physmap_idx + 1] = ptoa(Maxmem);
1668 /* call pmap initialization to make new kernel address space */
1669 pmap_bootstrap(first, 0);
1672 * Size up each available chunk of physical memory.
1674 physmap[0] = PAGE_SIZE; /* mask off page 0 */
1677 phys_avail[pa_indx++] = physmap[0];
1678 phys_avail[pa_indx] = physmap[0];
1679 dump_avail[da_indx] = physmap[0];
1684 * Get dcons buffer address
1686 if (kgetenv_quad("dcons.addr", &dcons_addr) == 0 ||
1687 kgetenv_quad("dcons.size", &dcons_size) == 0)
1691 * physmap is in bytes, so when converting to page boundaries,
1692 * round up the start address and round down the end address.
1694 for (i = 0; i <= physmap_idx; i += 2) {
1698 if (physmap[i + 1] < end)
1699 end = trunc_page(physmap[i + 1]);
1700 for (pa = round_page(physmap[i]); pa < end; pa += PAGE_SIZE) {
1701 int tmp, page_bad, full;
1705 int *ptr = (int *)CADDR1;
1710 * block out kernel memory as not available.
1712 if (pa >= 0x100000 && pa < first)
1716 * block out dcons buffer
1719 && pa >= trunc_page(dcons_addr)
1720 && pa < dcons_addr + dcons_size)
1726 * map page into kernel: valid, read/write,non-cacheable
1728 *pte = pa | PG_V | PG_RW | PG_N;
1733 * Test for alternating 1's and 0's
1735 *(volatile int *)ptr = 0xaaaaaaaa;
1736 if (*(volatile int *)ptr != 0xaaaaaaaa) {
1740 * Test for alternating 0's and 1's
1742 *(volatile int *)ptr = 0x55555555;
1743 if (*(volatile int *)ptr != 0x55555555) {
1749 *(volatile int *)ptr = 0xffffffff;
1750 if (*(volatile int *)ptr != 0xffffffff) {
1756 *(volatile int *)ptr = 0x0;
1757 if (*(volatile int *)ptr != 0x0) {
1761 * Restore original value.
1766 * Adjust array of valid/good pages.
1768 if (page_bad == TRUE) {
1772 * If this good page is a continuation of the
1773 * previous set of good pages, then just increase
1774 * the end pointer. Otherwise start a new chunk.
1775 * Note that "end" points one higher than end,
1776 * making the range >= start and < end.
1777 * If we're also doing a speculative memory
1778 * test and we at or past the end, bump up Maxmem
1779 * so that we keep going. The first bad page
1780 * will terminate the loop.
1782 if (phys_avail[pa_indx] == pa) {
1783 phys_avail[pa_indx] += PAGE_SIZE;
1786 if (pa_indx >= PHYSMAP_ENTRIES*2) {
1787 kprintf("Too many holes in the physical address space, giving up\n");
1792 phys_avail[pa_indx++] = pa; /* start */
1793 phys_avail[pa_indx] = pa + PAGE_SIZE; /* end */
1797 if (dump_avail[da_indx] == pa) {
1798 dump_avail[da_indx] += PAGE_SIZE;
1801 if (da_indx >= PHYSMAP_ENTRIES*2) {
1805 dump_avail[da_indx++] = pa; /* start */
1806 dump_avail[da_indx] = pa + PAGE_SIZE; /* end */
1819 * The last chunk must contain at least one page plus the message
1820 * buffer to avoid complicating other code (message buffer address
1821 * calculation, etc.).
1823 while (phys_avail[pa_indx - 1] + PAGE_SIZE +
1824 round_page(MSGBUF_SIZE) >= phys_avail[pa_indx]) {
1825 physmem -= atop(phys_avail[pa_indx] - phys_avail[pa_indx - 1]);
1826 phys_avail[pa_indx--] = 0;
1827 phys_avail[pa_indx--] = 0;
1830 Maxmem = atop(phys_avail[pa_indx]);
1832 /* Trim off space for the message buffer. */
1833 phys_avail[pa_indx] -= round_page(MSGBUF_SIZE);
1835 avail_end = phys_avail[pa_indx];
1847 * 7 Device Not Available (x87)
1849 * 9 Coprocessor Segment overrun (unsupported, reserved)
1851 * 11 Segment not present
1853 * 13 General Protection
1856 * 16 x87 FP Exception pending
1857 * 17 Alignment Check
1859 * 19 SIMD floating point
1861 * 32-255 INTn/external sources
1866 struct gate_descriptor *gdp;
1867 int gsel_tss, metadata_missing, off, x;
1868 struct mdglobaldata *gd;
1871 * Prevent lowering of the ipl if we call tsleep() early.
1873 gd = &CPU_prvspace[0].mdglobaldata;
1874 bzero(gd, sizeof(*gd));
1876 gd->mi.gd_curthread = &thread0;
1877 thread0.td_gd = &gd->mi;
1879 atdevbase = ISA_HOLE_START + KERNBASE;
1881 metadata_missing = 0;
1882 if (bootinfo.bi_modulep) {
1883 preload_metadata = (caddr_t)bootinfo.bi_modulep + KERNBASE;
1884 preload_bootstrap_relocate(KERNBASE);
1886 metadata_missing = 1;
1888 if (bootinfo.bi_envp)
1889 kern_envp = (caddr_t)bootinfo.bi_envp + KERNBASE;
1892 * start with one cpu. Note: with one cpu, ncpus2_shift, ncpus2_mask,
1893 * and ncpus_fit_mask remain 0.
1898 /* Init basic tunables, hz etc */
1902 * make gdt memory segments, the code segment goes up to end of the
1903 * page with etext in it, the data segment goes to the end of
1907 * XXX text protection is temporarily (?) disabled. The limit was
1908 * i386_btop(round_page(etext)) - 1.
1910 gdt_segs[GCODE_SEL].ssd_limit = atop(0 - 1);
1911 gdt_segs[GDATA_SEL].ssd_limit = atop(0 - 1);
1913 gdt_segs[GPRIV_SEL].ssd_limit =
1914 atop(sizeof(struct privatespace) - 1);
1915 gdt_segs[GPRIV_SEL].ssd_base = (int) &CPU_prvspace[0];
1916 gdt_segs[GPROC0_SEL].ssd_base =
1917 (int) &CPU_prvspace[0].mdglobaldata.gd_common_tss;
1919 gd->mi.gd_prvspace = &CPU_prvspace[0];
1922 * Note: on both UP and SMP curthread must be set non-NULL
1923 * early in the boot sequence because the system assumes
1924 * that 'curthread' is never NULL.
1927 for (x = 0; x < NGDT; x++) {
1929 /* avoid overwriting db entries with APM ones */
1930 if (x >= GAPMCODE32_SEL && x <= GAPMDATA_SEL)
1933 ssdtosd(&gdt_segs[x], &gdt[x].sd);
1936 r_gdt.rd_limit = NGDT * sizeof(gdt[0]) - 1;
1937 r_gdt.rd_base = (int) gdt;
1940 mi_gdinit(&gd->mi, 0);
1942 mi_proc0init(&gd->mi, proc0paddr);
1943 safepri = TDPRI_MAX;
1945 /* make ldt memory segments */
1947 * XXX - VM_MAX_USER_ADDRESS is an end address, not a max. And it
1948 * should be spelled ...MAX_USER...
1950 ldt_segs[LUCODE_SEL].ssd_limit = atop(VM_MAX_USER_ADDRESS - 1);
1951 ldt_segs[LUDATA_SEL].ssd_limit = atop(VM_MAX_USER_ADDRESS - 1);
1952 for (x = 0; x < sizeof ldt_segs / sizeof ldt_segs[0]; x++)
1953 ssdtosd(&ldt_segs[x], &ldt[x].sd);
1955 _default_ldt = GSEL(GLDT_SEL, SEL_KPL);
1957 gd->gd_currentldt = _default_ldt;
1958 /* spinlocks and the BGL */
1962 * Setup the hardware exception table. Most exceptions use
1963 * SDT_SYS386TGT, known as a 'trap gate'. Trap gates leave
1964 * interrupts enabled. VM page faults use SDT_SYS386IGT, known as
1965 * an 'interrupt trap gate', which disables interrupts on entry,
1966 * in order to be able to poll the appropriate CRn register to
1967 * determine the fault address.
1969 for (x = 0; x < NIDT; x++) {
1970 #ifdef DEBUG_INTERRUPTS
1971 setidt(x, Xrsvdary[x], SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1973 setidt(x, &IDTVEC(rsvd0), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1976 setidt(0, &IDTVEC(div), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1977 setidt(1, &IDTVEC(dbg), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1978 setidt(2, &IDTVEC(nmi), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1979 setidt(3, &IDTVEC(bpt), SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL));
1980 setidt(4, &IDTVEC(ofl), SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL));
1981 setidt(5, &IDTVEC(bnd), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1982 setidt(6, &IDTVEC(ill), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1983 setidt(7, &IDTVEC(dna), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1984 setidt(8, 0, SDT_SYSTASKGT, SEL_KPL, GSEL(GPANIC_SEL, SEL_KPL));
1985 setidt(9, &IDTVEC(fpusegm), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1986 setidt(10, &IDTVEC(tss), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1987 setidt(11, &IDTVEC(missing), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1988 setidt(12, &IDTVEC(stk), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1989 setidt(13, &IDTVEC(prot), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1990 setidt(14, &IDTVEC(page), SDT_SYS386IGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1991 setidt(15, &IDTVEC(rsvd0), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1992 setidt(16, &IDTVEC(fpu), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1993 setidt(17, &IDTVEC(align), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1994 setidt(18, &IDTVEC(mchk), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1995 setidt(19, &IDTVEC(xmm), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1996 setidt(0x80, &IDTVEC(int0x80_syscall),
1997 SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL));
1999 r_idt.rd_limit = sizeof(idt0) - 1;
2000 r_idt.rd_base = (int) idt;
2004 * Initialize the console before we print anything out.
2008 if (metadata_missing)
2009 kprintf("WARNING: loader(8) metadata is missing!\n");
2018 if (boothowto & RB_KDB)
2019 Debugger("Boot flags requested debugger");
2022 finishidentcpu(); /* Final stage of CPU initialization */
2023 setidt(6, &IDTVEC(ill), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
2024 setidt(13, &IDTVEC(prot), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
2025 initializecpu(); /* Initialize CPU registers */
2028 * make an initial tss so cpu can get interrupt stack on syscall!
2029 * The 16 bytes is to save room for a VM86 context.
2031 gd->gd_common_tss.tss_esp0 = (int) thread0.td_pcb - 16;
2032 gd->gd_common_tss.tss_ss0 = GSEL(GDATA_SEL, SEL_KPL) ;
2033 gsel_tss = GSEL(GPROC0_SEL, SEL_KPL);
2034 gd->gd_tss_gdt = &gdt[GPROC0_SEL].sd;
2035 gd->gd_common_tssd = *gd->gd_tss_gdt;
2036 gd->gd_common_tss.tss_ioopt = (sizeof gd->gd_common_tss) << 16;
2039 dblfault_tss.tss_esp = dblfault_tss.tss_esp0 = dblfault_tss.tss_esp1 =
2040 dblfault_tss.tss_esp2 = (int) &dblfault_stack[sizeof(dblfault_stack)];
2041 dblfault_tss.tss_ss = dblfault_tss.tss_ss0 = dblfault_tss.tss_ss1 =
2042 dblfault_tss.tss_ss2 = GSEL(GDATA_SEL, SEL_KPL);
2043 dblfault_tss.tss_cr3 = (int)IdlePTD;
2044 dblfault_tss.tss_eip = (int) dblfault_handler;
2045 dblfault_tss.tss_eflags = PSL_KERNEL;
2046 dblfault_tss.tss_ds = dblfault_tss.tss_es =
2047 dblfault_tss.tss_gs = GSEL(GDATA_SEL, SEL_KPL);
2048 dblfault_tss.tss_fs = GSEL(GPRIV_SEL, SEL_KPL);
2049 dblfault_tss.tss_cs = GSEL(GCODE_SEL, SEL_KPL);
2050 dblfault_tss.tss_ldt = GSEL(GLDT_SEL, SEL_KPL);
2054 init_param2(physmem);
2056 /* now running on new page tables, configured,and u/iom is accessible */
2058 /* Map the message buffer. */
2059 for (off = 0; off < round_page(MSGBUF_SIZE); off += PAGE_SIZE)
2060 pmap_kenter((vm_offset_t)msgbufp + off, avail_end + off);
2062 msgbufinit(msgbufp, MSGBUF_SIZE);
2064 /* make a call gate to reenter kernel with */
2065 gdp = &ldt[LSYS5CALLS_SEL].gd;
2067 x = (int) &IDTVEC(syscall);
2068 gdp->gd_looffset = x++;
2069 gdp->gd_selector = GSEL(GCODE_SEL,SEL_KPL);
2071 gdp->gd_type = SDT_SYS386CGT;
2072 gdp->gd_dpl = SEL_UPL;
2074 gdp->gd_hioffset = ((int) &IDTVEC(syscall)) >>16;
2076 /* XXX does this work? */
2077 ldt[LBSDICALLS_SEL] = ldt[LSYS5CALLS_SEL];
2078 ldt[LSOL26CALLS_SEL] = ldt[LSYS5CALLS_SEL];
2080 /* transfer to user mode */
2082 _ucodesel = LSEL(LUCODE_SEL, SEL_UPL);
2083 _udatasel = LSEL(LUDATA_SEL, SEL_UPL);
2085 /* setup proc 0's pcb */
2086 thread0.td_pcb->pcb_flags = 0;
2087 thread0.td_pcb->pcb_cr3 = (int)IdlePTD; /* should already be setup */
2088 thread0.td_pcb->pcb_ext = 0;
2089 lwp0.lwp_md.md_regs = &proc0_tf;
2093 * Initialize machine-dependant portions of the global data structure.
2094 * Note that the global data area and cpu0's idlestack in the private
2095 * data space were allocated in locore.
2097 * Note: the idlethread's cpl is 0
2099 * WARNING! Called from early boot, 'mycpu' may not work yet.
2102 cpu_gdinit(struct mdglobaldata *gd, int cpu)
2105 gd->mi.gd_curthread = &gd->mi.gd_idlethread;
2107 lwkt_init_thread(&gd->mi.gd_idlethread,
2108 gd->mi.gd_prvspace->idlestack,
2109 sizeof(gd->mi.gd_prvspace->idlestack),
2110 TDF_MPSAFE, &gd->mi);
2111 lwkt_set_comm(&gd->mi.gd_idlethread, "idle_%d", cpu);
2112 gd->mi.gd_idlethread.td_switch = cpu_lwkt_switch;
2113 gd->mi.gd_idlethread.td_sp -= sizeof(void *);
2114 *(void **)gd->mi.gd_idlethread.td_sp = cpu_idle_restore;
2118 is_globaldata_space(vm_offset_t saddr, vm_offset_t eaddr)
2120 if (saddr >= (vm_offset_t)&CPU_prvspace[0] &&
2121 eaddr <= (vm_offset_t)&CPU_prvspace[MAXCPU]) {
2128 globaldata_find(int cpu)
2130 KKASSERT(cpu >= 0 && cpu < ncpus);
2131 return(&CPU_prvspace[cpu].mdglobaldata.mi);
2134 #if defined(I586_CPU) && !defined(NO_F00F_HACK)
2135 static void f00f_hack(void *unused);
2136 SYSINIT(f00f_hack, SI_BOOT2_BIOS, SI_ORDER_ANY, f00f_hack, NULL);
2139 f00f_hack(void *unused)
2141 struct gate_descriptor *new_idt;
2147 kprintf("Intel Pentium detected, installing workaround for F00F bug\n");
2149 r_idt.rd_limit = sizeof(idt0) - 1;
2151 tmp = kmem_alloc(&kernel_map, PAGE_SIZE * 2);
2153 panic("kmem_alloc returned 0");
2154 if (((unsigned int)tmp & (PAGE_SIZE-1)) != 0)
2155 panic("kmem_alloc returned non-page-aligned memory");
2156 /* Put the first seven entries in the lower page */
2157 new_idt = (struct gate_descriptor*)(tmp + PAGE_SIZE - (7*8));
2158 bcopy(idt, new_idt, sizeof(idt0));
2159 r_idt.rd_base = (int)new_idt;
2162 if (vm_map_protect(&kernel_map, tmp, tmp + PAGE_SIZE,
2163 VM_PROT_READ, FALSE) != KERN_SUCCESS)
2164 panic("vm_map_protect failed");
2167 #endif /* defined(I586_CPU) && !NO_F00F_HACK */
2170 ptrace_set_pc(struct lwp *lp, unsigned long addr)
2172 lp->lwp_md.md_regs->tf_eip = addr;
2177 ptrace_single_step(struct lwp *lp)
2179 lp->lwp_md.md_regs->tf_eflags |= PSL_T;
2184 fill_regs(struct lwp *lp, struct reg *regs)
2186 struct trapframe *tp;
2188 tp = lp->lwp_md.md_regs;
2189 regs->r_gs = tp->tf_gs;
2190 regs->r_fs = tp->tf_fs;
2191 regs->r_es = tp->tf_es;
2192 regs->r_ds = tp->tf_ds;
2193 regs->r_edi = tp->tf_edi;
2194 regs->r_esi = tp->tf_esi;
2195 regs->r_ebp = tp->tf_ebp;
2196 regs->r_ebx = tp->tf_ebx;
2197 regs->r_edx = tp->tf_edx;
2198 regs->r_ecx = tp->tf_ecx;
2199 regs->r_eax = tp->tf_eax;
2200 regs->r_eip = tp->tf_eip;
2201 regs->r_cs = tp->tf_cs;
2202 regs->r_eflags = tp->tf_eflags;
2203 regs->r_esp = tp->tf_esp;
2204 regs->r_ss = tp->tf_ss;
2209 set_regs(struct lwp *lp, struct reg *regs)
2211 struct trapframe *tp;
2213 tp = lp->lwp_md.md_regs;
2214 if (!EFL_SECURE(regs->r_eflags, tp->tf_eflags) ||
2215 !CS_SECURE(regs->r_cs))
2217 tp->tf_gs = regs->r_gs;
2218 tp->tf_fs = regs->r_fs;
2219 tp->tf_es = regs->r_es;
2220 tp->tf_ds = regs->r_ds;
2221 tp->tf_edi = regs->r_edi;
2222 tp->tf_esi = regs->r_esi;
2223 tp->tf_ebp = regs->r_ebp;
2224 tp->tf_ebx = regs->r_ebx;
2225 tp->tf_edx = regs->r_edx;
2226 tp->tf_ecx = regs->r_ecx;
2227 tp->tf_eax = regs->r_eax;
2228 tp->tf_eip = regs->r_eip;
2229 tp->tf_cs = regs->r_cs;
2230 tp->tf_eflags = regs->r_eflags;
2231 tp->tf_esp = regs->r_esp;
2232 tp->tf_ss = regs->r_ss;
2236 #ifndef CPU_DISABLE_SSE
2238 fill_fpregs_xmm(struct savexmm *sv_xmm, struct save87 *sv_87)
2240 struct env87 *penv_87 = &sv_87->sv_env;
2241 struct envxmm *penv_xmm = &sv_xmm->sv_env;
2244 /* FPU control/status */
2245 penv_87->en_cw = penv_xmm->en_cw;
2246 penv_87->en_sw = penv_xmm->en_sw;
2247 penv_87->en_tw = penv_xmm->en_tw;
2248 penv_87->en_fip = penv_xmm->en_fip;
2249 penv_87->en_fcs = penv_xmm->en_fcs;
2250 penv_87->en_opcode = penv_xmm->en_opcode;
2251 penv_87->en_foo = penv_xmm->en_foo;
2252 penv_87->en_fos = penv_xmm->en_fos;
2255 for (i = 0; i < 8; ++i)
2256 sv_87->sv_ac[i] = sv_xmm->sv_fp[i].fp_acc;
2258 sv_87->sv_ex_sw = sv_xmm->sv_ex_sw;
2262 set_fpregs_xmm(struct save87 *sv_87, struct savexmm *sv_xmm)
2264 struct env87 *penv_87 = &sv_87->sv_env;
2265 struct envxmm *penv_xmm = &sv_xmm->sv_env;
2268 /* FPU control/status */
2269 penv_xmm->en_cw = penv_87->en_cw;
2270 penv_xmm->en_sw = penv_87->en_sw;
2271 penv_xmm->en_tw = penv_87->en_tw;
2272 penv_xmm->en_fip = penv_87->en_fip;
2273 penv_xmm->en_fcs = penv_87->en_fcs;
2274 penv_xmm->en_opcode = penv_87->en_opcode;
2275 penv_xmm->en_foo = penv_87->en_foo;
2276 penv_xmm->en_fos = penv_87->en_fos;
2279 for (i = 0; i < 8; ++i)
2280 sv_xmm->sv_fp[i].fp_acc = sv_87->sv_ac[i];
2282 sv_xmm->sv_ex_sw = sv_87->sv_ex_sw;
2284 #endif /* CPU_DISABLE_SSE */
2287 fill_fpregs(struct lwp *lp, struct fpreg *fpregs)
2289 #ifndef CPU_DISABLE_SSE
2291 fill_fpregs_xmm(&lp->lwp_thread->td_pcb->pcb_save.sv_xmm,
2292 (struct save87 *)fpregs);
2295 #endif /* CPU_DISABLE_SSE */
2296 bcopy(&lp->lwp_thread->td_pcb->pcb_save.sv_87, fpregs, sizeof *fpregs);
2301 set_fpregs(struct lwp *lp, struct fpreg *fpregs)
2303 #ifndef CPU_DISABLE_SSE
2305 set_fpregs_xmm((struct save87 *)fpregs,
2306 &lp->lwp_thread->td_pcb->pcb_save.sv_xmm);
2309 #endif /* CPU_DISABLE_SSE */
2310 bcopy(fpregs, &lp->lwp_thread->td_pcb->pcb_save.sv_87, sizeof *fpregs);
2315 fill_dbregs(struct lwp *lp, struct dbreg *dbregs)
2318 dbregs->dr0 = rdr0();
2319 dbregs->dr1 = rdr1();
2320 dbregs->dr2 = rdr2();
2321 dbregs->dr3 = rdr3();
2322 dbregs->dr4 = rdr4();
2323 dbregs->dr5 = rdr5();
2324 dbregs->dr6 = rdr6();
2325 dbregs->dr7 = rdr7();
2329 pcb = lp->lwp_thread->td_pcb;
2330 dbregs->dr0 = pcb->pcb_dr0;
2331 dbregs->dr1 = pcb->pcb_dr1;
2332 dbregs->dr2 = pcb->pcb_dr2;
2333 dbregs->dr3 = pcb->pcb_dr3;
2336 dbregs->dr6 = pcb->pcb_dr6;
2337 dbregs->dr7 = pcb->pcb_dr7;
2343 set_dbregs(struct lwp *lp, struct dbreg *dbregs)
2346 load_dr0(dbregs->dr0);
2347 load_dr1(dbregs->dr1);
2348 load_dr2(dbregs->dr2);
2349 load_dr3(dbregs->dr3);
2350 load_dr4(dbregs->dr4);
2351 load_dr5(dbregs->dr5);
2352 load_dr6(dbregs->dr6);
2353 load_dr7(dbregs->dr7);
2356 struct ucred *ucred;
2358 uint32_t mask1, mask2;
2361 * Don't let an illegal value for dr7 get set. Specifically,
2362 * check for undefined settings. Setting these bit patterns
2363 * result in undefined behaviour and can lead to an unexpected
2366 for (i = 0, mask1 = 0x3<<16, mask2 = 0x2<<16; i < 8;
2367 i++, mask1 <<= 2, mask2 <<= 2)
2368 if ((dbregs->dr7 & mask1) == mask2)
2371 pcb = lp->lwp_thread->td_pcb;
2372 ucred = lp->lwp_proc->p_ucred;
2375 * Don't let a process set a breakpoint that is not within the
2376 * process's address space. If a process could do this, it
2377 * could halt the system by setting a breakpoint in the kernel
2378 * (if ddb was enabled). Thus, we need to check to make sure
2379 * that no breakpoints are being enabled for addresses outside
2380 * process's address space, unless, perhaps, we were called by
2383 * XXX - what about when the watched area of the user's
2384 * address space is written into from within the kernel
2385 * ... wouldn't that still cause a breakpoint to be generated
2386 * from within kernel mode?
2389 if (priv_check_cred(ucred, PRIV_ROOT, 0) != 0) {
2390 if (dbregs->dr7 & 0x3) {
2391 /* dr0 is enabled */
2392 if (dbregs->dr0 >= VM_MAX_USER_ADDRESS)
2396 if (dbregs->dr7 & (0x3<<2)) {
2397 /* dr1 is enabled */
2398 if (dbregs->dr1 >= VM_MAX_USER_ADDRESS)
2402 if (dbregs->dr7 & (0x3<<4)) {
2403 /* dr2 is enabled */
2404 if (dbregs->dr2 >= VM_MAX_USER_ADDRESS)
2408 if (dbregs->dr7 & (0x3<<6)) {
2409 /* dr3 is enabled */
2410 if (dbregs->dr3 >= VM_MAX_USER_ADDRESS)
2415 pcb->pcb_dr0 = dbregs->dr0;
2416 pcb->pcb_dr1 = dbregs->dr1;
2417 pcb->pcb_dr2 = dbregs->dr2;
2418 pcb->pcb_dr3 = dbregs->dr3;
2419 pcb->pcb_dr6 = dbregs->dr6;
2420 pcb->pcb_dr7 = dbregs->dr7;
2422 pcb->pcb_flags |= PCB_DBREGS;
2429 * Return > 0 if a hardware breakpoint has been hit, and the
2430 * breakpoint was in user space. Return 0, otherwise.
2433 user_dbreg_trap(void)
2435 u_int32_t dr7, dr6; /* debug registers dr6 and dr7 */
2436 u_int32_t bp; /* breakpoint bits extracted from dr6 */
2437 int nbp; /* number of breakpoints that triggered */
2438 caddr_t addr[4]; /* breakpoint addresses */
2442 if ((dr7 & 0x000000ff) == 0) {
2444 * all GE and LE bits in the dr7 register are zero,
2445 * thus the trap couldn't have been caused by the
2446 * hardware debug registers
2453 bp = dr6 & 0x0000000f;
2457 * None of the breakpoint bits are set meaning this
2458 * trap was not caused by any of the debug registers
2464 * at least one of the breakpoints were hit, check to see
2465 * which ones and if any of them are user space addresses
2469 addr[nbp++] = (caddr_t)rdr0();
2472 addr[nbp++] = (caddr_t)rdr1();
2475 addr[nbp++] = (caddr_t)rdr2();
2478 addr[nbp++] = (caddr_t)rdr3();
2481 for (i=0; i<nbp; i++) {
2483 (caddr_t)VM_MAX_USER_ADDRESS) {
2485 * addr[i] is in user space
2492 * None of the breakpoints are in user space.
2500 Debugger(const char *msg)
2502 kprintf("Debugger(\"%s\") called.\n", msg);
2509 * Provide inb() and outb() as functions. They are normally only
2510 * available as macros calling inlined functions, thus cannot be
2511 * called inside DDB.
2513 * The actual code is stolen from <machine/cpufunc.h>, and de-inlined.
2519 /* silence compiler warnings */
2521 void outb(u_int, u_char);
2528 * We use %%dx and not %1 here because i/o is done at %dx and not at
2529 * %edx, while gcc generates inferior code (movw instead of movl)
2530 * if we tell it to load (u_short) port.
2532 __asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port));
2537 outb(u_int port, u_char data)
2541 * Use an unnecessary assignment to help gcc's register allocator.
2542 * This make a large difference for gcc-1.40 and a tiny difference
2543 * for gcc-2.6.0. For gcc-1.40, al had to be ``asm("ax")'' for
2544 * best results. gcc-2.6.0 can't handle this.
2547 __asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port));
2554 #include "opt_cpu.h"
2558 * initialize all the SMP locks
2561 /* critical region when masking or unmasking interupts */
2562 struct spinlock_deprecated imen_spinlock;
2564 /* Make FAST_INTR() routines sequential */
2565 struct spinlock_deprecated fast_intr_spinlock;
2567 /* critical region for old style disable_intr/enable_intr */
2568 struct spinlock_deprecated mpintr_spinlock;
2570 /* critical region around INTR() routines */
2571 struct spinlock_deprecated intr_spinlock;
2573 /* lock region used by kernel profiling */
2574 struct spinlock_deprecated mcount_spinlock;
2576 /* locks com (tty) data/hardware accesses: a FASTINTR() */
2577 struct spinlock_deprecated com_spinlock;
2579 /* locks kernel kprintfs */
2580 struct spinlock_deprecated cons_spinlock;
2582 /* lock regions around the clock hardware */
2583 struct spinlock_deprecated clock_spinlock;
2585 /* lock around the MP rendezvous */
2586 struct spinlock_deprecated smp_rv_spinlock;
2592 * mp_lock = 0; BSP already owns the MP lock
2595 * Get the initial mp_lock with a count of 1 for the BSP.
2596 * This uses a LOGICAL cpu ID, ie BSP == 0.
2599 cpu_get_initial_mplock();
2602 spin_lock_init(&mcount_spinlock);
2603 spin_lock_init(&fast_intr_spinlock);
2604 spin_lock_init(&intr_spinlock);
2605 spin_lock_init(&mpintr_spinlock);
2606 spin_lock_init(&imen_spinlock);
2607 spin_lock_init(&smp_rv_spinlock);
2608 spin_lock_init(&com_spinlock);
2609 spin_lock_init(&clock_spinlock);
2610 spin_lock_init(&cons_spinlock);
2612 /* our token pool needs to work early */
2613 lwkt_token_pool_init();