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 $
43 #include "opt_atalk.h"
44 #include "opt_compat.h"
47 #include "opt_directio.h"
50 #include "opt_maxmem.h"
51 #include "opt_msgbuf.h"
52 #include "opt_perfmon.h"
54 #include "opt_userconfig.h"
57 #include <sys/param.h>
58 #include <sys/systm.h>
59 #include <sys/sysproto.h>
60 #include <sys/signalvar.h>
61 #include <sys/kernel.h>
62 #include <sys/linker.h>
63 #include <sys/malloc.h>
67 #include <sys/reboot.h>
69 #include <sys/msgbuf.h>
70 #include <sys/sysent.h>
71 #include <sys/sysctl.h>
72 #include <sys/vmmeter.h>
74 #include <sys/upcall.h>
75 #include <sys/usched.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>
89 #include <sys/mplock2.h>
97 #include <machine/cpu.h>
98 #include <machine/clock.h>
99 #include <machine/specialreg.h>
100 #include <machine/bootinfo.h>
101 #include <machine/md_var.h>
102 #include <machine/pcb_ext.h> /* pcb.h included via sys/user.h */
103 #include <machine/globaldata.h> /* CPU_prvspace */
104 #include <machine/smp.h>
106 #include <machine/perfmon.h>
108 #include <machine/cputypes.h>
109 #include <machine/intr_machdep.h>
112 #include <bus/isa/isa_device.h>
114 #include <machine_base/isa/isa_intr.h>
115 #include <machine_base/isa/elcr_var.h>
116 #include <bus/isa/rtc.h>
117 #include <machine/vm86.h>
118 #include <sys/random.h>
119 #include <sys/ptrace.h>
120 #include <machine/sigframe.h>
122 #include <sys/machintr.h>
124 #define PHYSMAP_ENTRIES 10
126 extern void init386(int first);
127 extern void dblfault_handler(void);
129 extern void printcpuinfo(void); /* XXX header file */
130 extern void finishidentcpu(void);
131 extern void panicifcpuunsupported(void);
132 extern void initializecpu(void);
134 static void cpu_startup(void *);
135 #ifndef CPU_DISABLE_SSE
136 static void set_fpregs_xmm(struct save87 *, struct savexmm *);
137 static void fill_fpregs_xmm(struct savexmm *, struct save87 *);
138 #endif /* CPU_DISABLE_SSE */
140 extern void ffs_rawread_setup(void);
141 #endif /* DIRECTIO */
142 static void init_locks(void);
144 SYSINIT(cpu, SI_BOOT2_SMP, SI_ORDER_FIRST, cpu_startup, NULL)
146 int _udatasel, _ucodesel;
149 int64_t tsc_offsets[MAXCPU];
151 int64_t tsc_offsets[1];
154 #if defined(SWTCH_OPTIM_STATS)
155 extern int swtch_optim_stats;
156 SYSCTL_INT(_debug, OID_AUTO, swtch_optim_stats,
157 CTLFLAG_RD, &swtch_optim_stats, 0, "");
158 SYSCTL_INT(_debug, OID_AUTO, tlb_flush_count,
159 CTLFLAG_RD, &tlb_flush_count, 0, "");
164 u_long ebda_addr = 0;
167 sysctl_hw_physmem(SYSCTL_HANDLER_ARGS)
169 int error = sysctl_handle_int(oidp, 0, ctob(physmem), req);
173 SYSCTL_PROC(_hw, HW_PHYSMEM, physmem, CTLTYPE_INT|CTLFLAG_RD,
174 0, 0, sysctl_hw_physmem, "IU", "");
177 sysctl_hw_usermem(SYSCTL_HANDLER_ARGS)
179 int error = sysctl_handle_int(oidp, 0,
180 ctob(physmem - vmstats.v_wire_count), req);
184 SYSCTL_PROC(_hw, HW_USERMEM, usermem, CTLTYPE_INT|CTLFLAG_RD,
185 0, 0, sysctl_hw_usermem, "IU", "");
188 sysctl_hw_availpages(SYSCTL_HANDLER_ARGS)
190 int error = sysctl_handle_int(oidp, 0,
191 i386_btop(avail_end - avail_start), req);
195 SYSCTL_PROC(_hw, OID_AUTO, availpages, CTLTYPE_INT|CTLFLAG_RD,
196 0, 0, sysctl_hw_availpages, "I", "");
201 vm_paddr_t phys_avail[PHYSMAP_ENTRIES*2+2];
202 vm_paddr_t dump_avail[PHYSMAP_ENTRIES*2+2];
205 static vm_offset_t buffer_sva, buffer_eva;
206 vm_offset_t clean_sva, clean_eva;
207 static vm_offset_t pager_sva, pager_eva;
208 static struct trapframe proc0_tf;
211 cpu_startup(void *dummy)
215 vm_offset_t firstaddr;
217 if (boothowto & RB_VERBOSE)
221 * Good {morning,afternoon,evening,night}.
223 kprintf("%s", version);
226 panicifcpuunsupported();
230 kprintf("real memory = %ju (%ju MB)\n",
232 (intmax_t)Realmem / 1024 / 1024);
234 * Display any holes after the first chunk of extended memory.
239 kprintf("Physical memory chunk(s):\n");
240 for (indx = 0; phys_avail[indx + 1] != 0; indx += 2) {
241 vm_paddr_t size1 = phys_avail[indx + 1] - phys_avail[indx];
243 kprintf("0x%08llx - 0x%08llx, %llu bytes (%llu pages)\n",
244 phys_avail[indx], phys_avail[indx + 1] - 1, size1,
250 * Allocate space for system data structures.
251 * The first available kernel virtual address is in "v".
252 * As pages of kernel virtual memory are allocated, "v" is incremented.
253 * As pages of memory are allocated and cleared,
254 * "firstaddr" is incremented.
255 * An index into the kernel page table corresponding to the
256 * virtual memory address maintained in "v" is kept in "mapaddr".
260 * Make two passes. The first pass calculates how much memory is
261 * needed and allocates it. The second pass assigns virtual
262 * addresses to the various data structures.
266 v = (caddr_t)firstaddr;
268 #define valloc(name, type, num) \
269 (name) = (type *)v; v = (caddr_t)((name)+(num))
270 #define valloclim(name, type, num, lim) \
271 (name) = (type *)v; v = (caddr_t)((lim) = ((name)+(num)))
274 * The nominal buffer size (and minimum KVA allocation) is BKVASIZE.
275 * For the first 64MB of ram nominally allocate sufficient buffers to
276 * cover 1/4 of our ram. Beyond the first 64MB allocate additional
277 * buffers to cover 1/20 of our ram over 64MB. When auto-sizing
278 * the buffer cache we limit the eventual kva reservation to
281 * factor represents the 1/4 x ram conversion.
284 int factor = 4 * BKVASIZE / 1024;
285 int kbytes = physmem * (PAGE_SIZE / 1024);
289 nbuf += min((kbytes - 4096) / factor, 65536 / factor);
291 nbuf += (kbytes - 65536) * 2 / (factor * 5);
292 if (maxbcache && nbuf > maxbcache / BKVASIZE)
293 nbuf = maxbcache / BKVASIZE;
297 * Do not allow the buffer_map to be more then 1/2 the size of the
300 if (nbuf > (virtual_end - virtual_start) / (BKVASIZE * 2)) {
301 nbuf = (virtual_end - virtual_start) / (BKVASIZE * 2);
302 kprintf("Warning: nbufs capped at %d\n", nbuf);
305 /* limit to 128 on i386 */
306 nswbuf = max(min(nbuf/4, 128), 16);
308 if (nswbuf < NSWBUF_MIN)
315 valloc(swbuf, struct buf, nswbuf);
316 valloc(buf, struct buf, nbuf);
319 * End of first pass, size has been calculated so allocate memory
321 if (firstaddr == 0) {
322 size = (vm_size_t)(v - firstaddr);
323 firstaddr = kmem_alloc(&kernel_map, round_page(size));
325 panic("startup: no room for tables");
330 * End of second pass, addresses have been assigned
332 if ((vm_size_t)(v - firstaddr) != size)
333 panic("startup: table size inconsistency");
335 kmem_suballoc(&kernel_map, &clean_map, &clean_sva, &clean_eva,
336 (nbuf*BKVASIZE) + (nswbuf*MAXPHYS) + pager_map_size);
337 kmem_suballoc(&clean_map, &buffer_map, &buffer_sva, &buffer_eva,
339 buffer_map.system_map = 1;
340 kmem_suballoc(&clean_map, &pager_map, &pager_sva, &pager_eva,
341 (nswbuf*MAXPHYS) + pager_map_size);
342 pager_map.system_map = 1;
344 #if defined(USERCONFIG)
346 cninit(); /* the preferred console may have changed */
349 kprintf("avail memory = %ju (%ju MB)\n",
350 (intmax_t)ptoa(vmstats.v_free_count),
351 (intmax_t)ptoa(vmstats.v_free_count) / 1024 / 1024);
354 * Set up buffers, so they can be used to read disk labels.
357 vm_pager_bufferinit();
359 /* Log ELCR information */
364 * OK, enough kmem_alloc/malloc state should be up, lets get on with it!
366 mp_start(); /* fire up the APs and APICs */
373 * Send an interrupt to process.
375 * Stack is set up to allow sigcode stored
376 * at top to call routine, followed by kcall
377 * to sigreturn routine below. After sigreturn
378 * resets the signal mask, the stack, and the
379 * frame pointer, it returns to the user
383 sendsig(sig_t catcher, int sig, sigset_t *mask, u_long code)
385 struct lwp *lp = curthread->td_lwp;
386 struct proc *p = lp->lwp_proc;
387 struct trapframe *regs;
388 struct sigacts *psp = p->p_sigacts;
389 struct sigframe sf, *sfp;
392 regs = lp->lwp_md.md_regs;
393 oonstack = (lp->lwp_sigstk.ss_flags & SS_ONSTACK) ? 1 : 0;
395 /* save user context */
396 bzero(&sf, sizeof(struct sigframe));
397 sf.sf_uc.uc_sigmask = *mask;
398 sf.sf_uc.uc_stack = lp->lwp_sigstk;
399 sf.sf_uc.uc_mcontext.mc_onstack = oonstack;
400 bcopy(regs, &sf.sf_uc.uc_mcontext.mc_gs, sizeof(struct trapframe));
402 /* make the size of the saved context visible to userland */
403 sf.sf_uc.uc_mcontext.mc_len = sizeof(sf.sf_uc.uc_mcontext);
405 /* save mailbox pending state for syscall interlock semantics */
406 if (p->p_flag & P_MAILBOX)
407 sf.sf_uc.uc_mcontext.mc_xflags |= PGEX_MAILBOX;
409 /* Allocate and validate space for the signal handler context. */
410 if ((lp->lwp_flag & LWP_ALTSTACK) != 0 && !oonstack &&
411 SIGISMEMBER(psp->ps_sigonstack, sig)) {
412 sfp = (struct sigframe *)(lp->lwp_sigstk.ss_sp +
413 lp->lwp_sigstk.ss_size - sizeof(struct sigframe));
414 lp->lwp_sigstk.ss_flags |= SS_ONSTACK;
416 sfp = (struct sigframe *)regs->tf_esp - 1;
419 /* Translate the signal is appropriate */
420 if (p->p_sysent->sv_sigtbl) {
421 if (sig <= p->p_sysent->sv_sigsize)
422 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)];
425 /* Build the argument list for the signal handler. */
427 sf.sf_ucontext = (register_t)&sfp->sf_uc;
428 if (SIGISMEMBER(psp->ps_siginfo, sig)) {
429 /* Signal handler installed with SA_SIGINFO. */
430 sf.sf_siginfo = (register_t)&sfp->sf_si;
431 sf.sf_ahu.sf_action = (__siginfohandler_t *)catcher;
433 /* fill siginfo structure */
434 sf.sf_si.si_signo = sig;
435 sf.sf_si.si_code = code;
436 sf.sf_si.si_addr = (void*)regs->tf_err;
439 /* Old FreeBSD-style arguments. */
440 sf.sf_siginfo = code;
441 sf.sf_addr = regs->tf_err;
442 sf.sf_ahu.sf_handler = catcher;
446 * If we're a vm86 process, we want to save the segment registers.
447 * We also change eflags to be our emulated eflags, not the actual
450 if (regs->tf_eflags & PSL_VM) {
451 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs;
452 struct vm86_kernel *vm86 = &lp->lwp_thread->td_pcb->pcb_ext->ext_vm86;
454 sf.sf_uc.uc_mcontext.mc_gs = tf->tf_vm86_gs;
455 sf.sf_uc.uc_mcontext.mc_fs = tf->tf_vm86_fs;
456 sf.sf_uc.uc_mcontext.mc_es = tf->tf_vm86_es;
457 sf.sf_uc.uc_mcontext.mc_ds = tf->tf_vm86_ds;
459 if (vm86->vm86_has_vme == 0)
460 sf.sf_uc.uc_mcontext.mc_eflags =
461 (tf->tf_eflags & ~(PSL_VIF | PSL_VIP)) |
462 (vm86->vm86_eflags & (PSL_VIF | PSL_VIP));
465 * Clear PSL_NT to inhibit T_TSSFLT faults on return from
466 * syscalls made by the signal handler. This just avoids
467 * wasting time for our lazy fixup of such faults. PSL_NT
468 * does nothing in vm86 mode, but vm86 programs can set it
469 * almost legitimately in probes for old cpu types.
471 tf->tf_eflags &= ~(PSL_VM | PSL_NT | PSL_VIF | PSL_VIP);
475 * Save the FPU state and reinit the FP unit
477 npxpush(&sf.sf_uc.uc_mcontext);
480 * Copy the sigframe out to the user's stack.
482 if (copyout(&sf, sfp, sizeof(struct sigframe)) != 0) {
484 * Something is wrong with the stack pointer.
485 * ...Kill the process.
490 regs->tf_esp = (int)sfp;
491 regs->tf_eip = PS_STRINGS - *(p->p_sysent->sv_szsigcode);
494 * i386 abi specifies that the direction flag must be cleared
497 regs->tf_eflags &= ~(PSL_T|PSL_D);
499 regs->tf_cs = _ucodesel;
500 regs->tf_ds = _udatasel;
501 regs->tf_es = _udatasel;
504 * Allow the signal handler to inherit %fs in addition to %gs as
505 * the userland program might be using both.
507 * However, if a T_PROTFLT occured the segment registers could be
508 * totally broken. They must be reset in order to be able to
509 * return to userland.
511 if (regs->tf_trapno == T_PROTFLT) {
512 regs->tf_fs = _udatasel;
513 regs->tf_gs = _udatasel;
515 regs->tf_ss = _udatasel;
519 * Sanitize the trapframe for a virtual kernel passing control to a custom
520 * VM context. Remove any items that would otherwise create a privilage
523 * XXX at the moment we allow userland to set the resume flag. Is this a
527 cpu_sanitize_frame(struct trapframe *frame)
529 frame->tf_cs = _ucodesel;
530 frame->tf_ds = _udatasel;
531 frame->tf_es = _udatasel; /* XXX allow userland this one too? */
533 frame->tf_fs = _udatasel;
534 frame->tf_gs = _udatasel;
536 frame->tf_ss = _udatasel;
537 frame->tf_eflags &= (PSL_RF | PSL_USERCHANGE);
538 frame->tf_eflags |= PSL_RESERVED_DEFAULT | PSL_I;
543 cpu_sanitize_tls(struct savetls *tls)
545 struct segment_descriptor *desc;
548 for (i = 0; i < NGTLS; ++i) {
550 if (desc->sd_dpl == 0 && desc->sd_type == 0)
552 if (desc->sd_def32 == 0)
554 if (desc->sd_type != SDT_MEMRWA)
556 if (desc->sd_dpl != SEL_UPL)
558 if (desc->sd_xx != 0 || desc->sd_p != 1)
565 * sigreturn(ucontext_t *sigcntxp)
567 * System call to cleanup state after a signal
568 * has been taken. Reset signal mask and
569 * stack state from context left by sendsig (above).
570 * Return to previous pc and psl as specified by
571 * context left by sendsig. Check carefully to
572 * make sure that the user has not modified the
573 * state to gain improper privileges.
577 #define EFL_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0)
578 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL)
581 sys_sigreturn(struct sigreturn_args *uap)
583 struct lwp *lp = curthread->td_lwp;
584 struct proc *p = lp->lwp_proc;
585 struct trapframe *regs;
593 * We have to copy the information into kernel space so userland
594 * can't modify it while we are sniffing it.
596 regs = lp->lwp_md.md_regs;
597 error = copyin(uap->sigcntxp, &uc, sizeof(uc));
601 eflags = ucp->uc_mcontext.mc_eflags;
603 if (eflags & PSL_VM) {
604 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs;
605 struct vm86_kernel *vm86;
608 * if pcb_ext == 0 or vm86_inited == 0, the user hasn't
609 * set up the vm86 area, and we can't enter vm86 mode.
611 if (lp->lwp_thread->td_pcb->pcb_ext == 0)
613 vm86 = &lp->lwp_thread->td_pcb->pcb_ext->ext_vm86;
614 if (vm86->vm86_inited == 0)
617 /* go back to user mode if both flags are set */
618 if ((eflags & PSL_VIP) && (eflags & PSL_VIF))
619 trapsignal(lp, SIGBUS, 0);
621 if (vm86->vm86_has_vme) {
622 eflags = (tf->tf_eflags & ~VME_USERCHANGE) |
623 (eflags & VME_USERCHANGE) | PSL_VM;
625 vm86->vm86_eflags = eflags; /* save VIF, VIP */
626 eflags = (tf->tf_eflags & ~VM_USERCHANGE) |
627 (eflags & VM_USERCHANGE) | PSL_VM;
629 bcopy(&ucp->uc_mcontext.mc_gs, tf, sizeof(struct trapframe));
630 tf->tf_eflags = eflags;
631 tf->tf_vm86_ds = tf->tf_ds;
632 tf->tf_vm86_es = tf->tf_es;
633 tf->tf_vm86_fs = tf->tf_fs;
634 tf->tf_vm86_gs = tf->tf_gs;
635 tf->tf_ds = _udatasel;
636 tf->tf_es = _udatasel;
638 tf->tf_fs = _udatasel;
639 tf->tf_gs = _udatasel;
643 * Don't allow users to change privileged or reserved flags.
646 * XXX do allow users to change the privileged flag PSL_RF.
647 * The cpu sets PSL_RF in tf_eflags for faults. Debuggers
648 * should sometimes set it there too. tf_eflags is kept in
649 * the signal context during signal handling and there is no
650 * other place to remember it, so the PSL_RF bit may be
651 * corrupted by the signal handler without us knowing.
652 * Corruption of the PSL_RF bit at worst causes one more or
653 * one less debugger trap, so allowing it is fairly harmless.
655 if (!EFL_SECURE(eflags & ~PSL_RF, regs->tf_eflags & ~PSL_RF)) {
656 kprintf("sigreturn: eflags = 0x%x\n", eflags);
661 * Don't allow users to load a valid privileged %cs. Let the
662 * hardware check for invalid selectors, excess privilege in
663 * other selectors, invalid %eip's and invalid %esp's.
665 cs = ucp->uc_mcontext.mc_cs;
666 if (!CS_SECURE(cs)) {
667 kprintf("sigreturn: cs = 0x%x\n", cs);
668 trapsignal(lp, SIGBUS, T_PROTFLT);
671 bcopy(&ucp->uc_mcontext.mc_gs, regs, sizeof(struct trapframe));
675 * Restore the FPU state from the frame
678 npxpop(&ucp->uc_mcontext);
681 * Merge saved signal mailbox pending flag to maintain interlock
682 * semantics against system calls.
684 if (ucp->uc_mcontext.mc_xflags & PGEX_MAILBOX)
685 p->p_flag |= P_MAILBOX;
687 if (ucp->uc_mcontext.mc_onstack & 1)
688 lp->lwp_sigstk.ss_flags |= SS_ONSTACK;
690 lp->lwp_sigstk.ss_flags &= ~SS_ONSTACK;
692 lp->lwp_sigmask = ucp->uc_sigmask;
693 SIG_CANTMASK(lp->lwp_sigmask);
699 * Stack frame on entry to function. %eax will contain the function vector,
700 * %ecx will contain the function data. flags, ecx, and eax will have
701 * already been pushed on the stack.
712 sendupcall(struct vmupcall *vu, int morepending)
714 struct lwp *lp = curthread->td_lwp;
715 struct trapframe *regs;
716 struct upcall upcall;
717 struct upc_frame upc_frame;
721 * If we are a virtual kernel running an emulated user process
722 * context, switch back to the virtual kernel context before
723 * trying to post the signal.
725 if (lp->lwp_vkernel && lp->lwp_vkernel->ve) {
726 lp->lwp_md.md_regs->tf_trapno = 0;
727 vkernel_trap(lp, lp->lwp_md.md_regs);
731 * Get the upcall data structure
733 if (copyin(lp->lwp_upcall, &upcall, sizeof(upcall)) ||
734 copyin((char *)upcall.upc_uthread + upcall.upc_critoff, &crit_count, sizeof(int))
737 kprintf("bad upcall address\n");
742 * If the data structure is already marked pending or has a critical
743 * section count, mark the data structure as pending and return
744 * without doing an upcall. vu_pending is left set.
746 if (upcall.upc_pending || crit_count >= vu->vu_pending) {
747 if (upcall.upc_pending < vu->vu_pending) {
748 upcall.upc_pending = vu->vu_pending;
749 copyout(&upcall.upc_pending, &lp->lwp_upcall->upc_pending,
750 sizeof(upcall.upc_pending));
756 * We can run this upcall now, clear vu_pending.
758 * Bump our critical section count and set or clear the
759 * user pending flag depending on whether more upcalls are
760 * pending. The user will be responsible for calling
761 * upc_dispatch(-1) to process remaining upcalls.
764 upcall.upc_pending = morepending;
766 copyout(&upcall.upc_pending, &lp->lwp_upcall->upc_pending,
767 sizeof(upcall.upc_pending));
768 copyout(&crit_count, (char *)upcall.upc_uthread + upcall.upc_critoff,
772 * Construct a stack frame and issue the upcall
774 regs = lp->lwp_md.md_regs;
775 upc_frame.eax = regs->tf_eax;
776 upc_frame.ecx = regs->tf_ecx;
777 upc_frame.edx = regs->tf_edx;
778 upc_frame.flags = regs->tf_eflags;
779 upc_frame.oldip = regs->tf_eip;
780 if (copyout(&upc_frame, (void *)(regs->tf_esp - sizeof(upc_frame)),
781 sizeof(upc_frame)) != 0) {
782 kprintf("bad stack on upcall\n");
784 regs->tf_eax = (register_t)vu->vu_func;
785 regs->tf_ecx = (register_t)vu->vu_data;
786 regs->tf_edx = (register_t)lp->lwp_upcall;
787 regs->tf_eip = (register_t)vu->vu_ctx;
788 regs->tf_esp -= sizeof(upc_frame);
793 * fetchupcall occurs in the context of a system call, which means that
794 * we have to return EJUSTRETURN in order to prevent eax and edx from
795 * being overwritten by the syscall return value.
797 * if vu is not NULL we return the new context in %edx, the new data in %ecx,
798 * and the function pointer in %eax.
801 fetchupcall(struct vmupcall *vu, int morepending, void *rsp)
803 struct upc_frame upc_frame;
804 struct lwp *lp = curthread->td_lwp;
805 struct trapframe *regs;
807 struct upcall upcall;
810 regs = lp->lwp_md.md_regs;
812 error = copyout(&morepending, &lp->lwp_upcall->upc_pending, sizeof(int));
816 * This jumps us to the next ready context.
819 error = copyin(lp->lwp_upcall, &upcall, sizeof(upcall));
822 error = copyin((char *)upcall.upc_uthread + upcall.upc_critoff, &crit_count, sizeof(int));
825 error = copyout(&crit_count, (char *)upcall.upc_uthread + upcall.upc_critoff, sizeof(int));
826 regs->tf_eax = (register_t)vu->vu_func;
827 regs->tf_ecx = (register_t)vu->vu_data;
828 regs->tf_edx = (register_t)lp->lwp_upcall;
829 regs->tf_eip = (register_t)vu->vu_ctx;
830 regs->tf_esp = (register_t)rsp;
833 * This returns us to the originally interrupted code.
835 error = copyin(rsp, &upc_frame, sizeof(upc_frame));
836 regs->tf_eax = upc_frame.eax;
837 regs->tf_ecx = upc_frame.ecx;
838 regs->tf_edx = upc_frame.edx;
839 regs->tf_eflags = (regs->tf_eflags & ~PSL_USERCHANGE) |
840 (upc_frame.flags & PSL_USERCHANGE);
841 regs->tf_eip = upc_frame.oldip;
842 regs->tf_esp = (register_t)((char *)rsp + sizeof(upc_frame));
851 * Machine dependent boot() routine
853 * I haven't seen anything to put here yet
854 * Possibly some stuff might be grafted back here from boot()
862 * Shutdown the CPU as much as possible
868 __asm__ __volatile("hlt");
872 * cpu_idle() represents the idle LWKT. You cannot return from this function
873 * (unless you want to blow things up!). Instead we look for runnable threads
874 * and loop or halt as appropriate. Giant is not held on entry to the thread.
876 * The main loop is entered with a critical section held, we must release
877 * the critical section before doing anything else. lwkt_switch() will
878 * check for pending interrupts due to entering and exiting its own
881 * NOTE: On an SMP system we rely on a scheduler IPI to wake a HLTed cpu up.
882 * However, there are cases where the idlethread will be entered with
883 * the possibility that no IPI will occur and in such cases
884 * lwkt_switch() sets RQF_WAKEUP. We usually check
885 * RQF_IDLECHECK_WK_MASK.
887 * NOTE: cpu_idle_hlt again defaults to 2 (use ACPI sleep states). Set to
888 * 1 to just use hlt and for debugging purposes.
890 static int cpu_idle_hlt = 2;
891 static int cpu_idle_hltcnt;
892 static int cpu_idle_spincnt;
893 static u_int cpu_idle_repeat = 4;
894 SYSCTL_INT(_machdep, OID_AUTO, cpu_idle_hlt, CTLFLAG_RW,
895 &cpu_idle_hlt, 0, "Idle loop HLT enable");
896 SYSCTL_INT(_machdep, OID_AUTO, cpu_idle_hltcnt, CTLFLAG_RW,
897 &cpu_idle_hltcnt, 0, "Idle loop entry halts");
898 SYSCTL_INT(_machdep, OID_AUTO, cpu_idle_spincnt, CTLFLAG_RW,
899 &cpu_idle_spincnt, 0, "Idle loop entry spins");
900 SYSCTL_INT(_machdep, OID_AUTO, cpu_idle_repeat, CTLFLAG_RW,
901 &cpu_idle_repeat, 0, "Idle entries before acpi hlt");
904 cpu_idle_default_hook(void)
907 * We must guarentee that hlt is exactly the instruction
910 __asm __volatile("sti; hlt");
913 /* Other subsystems (e.g., ACPI) can hook this later. */
914 void (*cpu_idle_hook)(void) = cpu_idle_default_hook;
919 globaldata_t gd = mycpu;
920 struct thread *td = gd->gd_curthread;
925 KKASSERT(td->td_critcount == 0);
928 * See if there are any LWKTs ready to go.
933 * When halting inside a cli we must check for reqflags
934 * races, particularly [re]schedule requests. Running
935 * splz() does the job.
938 * 0 Never halt, just spin
940 * 1 Always use HLT (or MONITOR/MWAIT if avail).
941 * This typically eats more power than the
944 * 2 Use HLT/MONITOR/MWAIT up to a point and then
945 * use the ACPI halt (default). This is a hybrid
946 * approach. See machdep.cpu_idle_repeat.
948 * 3 Always use the ACPI halt. This typically
949 * eats the least amount of power but the cpu
950 * will be slow waking up. Slows down e.g.
951 * compiles and other pipe/event oriented stuff.
954 * NOTE: Interrupts are enabled and we are not in a critical
957 * NOTE: Preemptions do not reset gd_idle_repeat. Also we
958 * don't bother capping gd_idle_repeat, it is ok if
961 ++gd->gd_idle_repeat;
962 reqflags = gd->gd_reqflags;
963 quick = (cpu_idle_hlt == 1) ||
965 gd->gd_idle_repeat < cpu_idle_repeat);
967 if (quick && (cpu_mi_feature & CPU_MI_MONITOR) &&
968 (reqflags & RQF_IDLECHECK_WK_MASK) == 0) {
969 cpu_mmw_pause_int(&gd->gd_reqflags, reqflags);
971 } else if (cpu_idle_hlt) {
972 __asm __volatile("cli");
974 if ((gd->gd_reqflags & RQF_IDLECHECK_WK_MASK) == 0) {
976 cpu_idle_default_hook();
980 __asm __volatile("sti");
984 __asm __volatile("sti");
993 * This routine is called if a spinlock has been held through the
994 * exponential backoff period and is seriously contested. On a real cpu
998 cpu_spinlock_contested(void)
1006 * Clear registers on exec
1009 exec_setregs(u_long entry, u_long stack, u_long ps_strings)
1011 struct thread *td = curthread;
1012 struct lwp *lp = td->td_lwp;
1013 struct pcb *pcb = td->td_pcb;
1014 struct trapframe *regs = lp->lwp_md.md_regs;
1016 /* was i386_user_cleanup() in NetBSD */
1019 bzero((char *)regs, sizeof(struct trapframe));
1020 regs->tf_eip = entry;
1021 regs->tf_esp = stack;
1022 regs->tf_eflags = PSL_USER | (regs->tf_eflags & PSL_T);
1023 regs->tf_ss = _udatasel;
1024 regs->tf_ds = _udatasel;
1025 regs->tf_es = _udatasel;
1026 regs->tf_fs = _udatasel;
1027 regs->tf_gs = _udatasel;
1028 regs->tf_cs = _ucodesel;
1030 /* PS_STRINGS value for BSD/OS binaries. It is 0 for non-BSD/OS. */
1031 regs->tf_ebx = ps_strings;
1034 * Reset the hardware debug registers if they were in use.
1035 * They won't have any meaning for the newly exec'd process.
1037 if (pcb->pcb_flags & PCB_DBREGS) {
1044 if (pcb == td->td_pcb) {
1046 * Clear the debug registers on the running
1047 * CPU, otherwise they will end up affecting
1048 * the next process we switch to.
1052 pcb->pcb_flags &= ~PCB_DBREGS;
1056 * Initialize the math emulator (if any) for the current process.
1057 * Actually, just clear the bit that says that the emulator has
1058 * been initialized. Initialization is delayed until the process
1059 * traps to the emulator (if it is done at all) mainly because
1060 * emulators don't provide an entry point for initialization.
1062 pcb->pcb_flags &= ~FP_SOFTFP;
1065 * note: do not set CR0_TS here. npxinit() must do it after clearing
1066 * gd_npxthread. Otherwise a preemptive interrupt thread may panic
1070 load_cr0(rcr0() | CR0_MP);
1073 /* Initialize the npx (if any) for the current process. */
1074 npxinit(__INITIAL_NPXCW__);
1079 * note: linux emulator needs edx to be 0x0 on entry, which is
1080 * handled in execve simply by setting the 64 bit syscall
1081 * return value to 0.
1091 cr0 |= CR0_NE; /* Done by npxinit() */
1092 cr0 |= CR0_MP | CR0_TS; /* Done at every execve() too. */
1093 cr0 |= CR0_WP | CR0_AM;
1099 sysctl_machdep_adjkerntz(SYSCTL_HANDLER_ARGS)
1102 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2,
1104 if (!error && req->newptr)
1109 SYSCTL_PROC(_machdep, CPU_ADJKERNTZ, adjkerntz, CTLTYPE_INT|CTLFLAG_RW,
1110 &adjkerntz, 0, sysctl_machdep_adjkerntz, "I", "");
1112 SYSCTL_INT(_machdep, CPU_DISRTCSET, disable_rtc_set,
1113 CTLFLAG_RW, &disable_rtc_set, 0, "");
1115 SYSCTL_STRUCT(_machdep, CPU_BOOTINFO, bootinfo,
1116 CTLFLAG_RD, &bootinfo, bootinfo, "");
1118 SYSCTL_INT(_machdep, CPU_WALLCLOCK, wall_cmos_clock,
1119 CTLFLAG_RW, &wall_cmos_clock, 0, "");
1121 extern u_long bootdev; /* not a cdev_t - encoding is different */
1122 SYSCTL_ULONG(_machdep, OID_AUTO, guessed_bootdev,
1123 CTLFLAG_RD, &bootdev, 0, "Boot device (not in cdev_t format)");
1126 * Initialize 386 and configure to run kernel
1130 * Initialize segments & interrupt table
1134 union descriptor gdt[NGDT * MAXCPU]; /* global descriptor table */
1135 static struct gate_descriptor idt0[NIDT];
1136 struct gate_descriptor *idt = &idt0[0]; /* interrupt descriptor table */
1137 union descriptor ldt[NLDT]; /* local descriptor table */
1139 /* table descriptors - used to load tables by cpu */
1140 struct region_descriptor r_gdt, r_idt;
1142 #if defined(I586_CPU) && !defined(NO_F00F_HACK)
1143 extern int has_f00f_bug;
1146 static struct i386tss dblfault_tss;
1147 static char dblfault_stack[PAGE_SIZE];
1149 extern struct user *proc0paddr;
1152 /* software prototypes -- in more palatable form */
1153 struct soft_segment_descriptor gdt_segs[] = {
1154 /* GNULL_SEL 0 Null Descriptor */
1155 { 0x0, /* segment base address */
1157 0, /* segment type */
1158 0, /* segment descriptor priority level */
1159 0, /* segment descriptor present */
1161 0, /* default 32 vs 16 bit size */
1162 0 /* limit granularity (byte/page units)*/ },
1163 /* GCODE_SEL 1 Code Descriptor for kernel */
1164 { 0x0, /* segment base address */
1165 0xfffff, /* length - all address space */
1166 SDT_MEMERA, /* segment type */
1167 0, /* segment descriptor priority level */
1168 1, /* segment descriptor present */
1170 1, /* default 32 vs 16 bit size */
1171 1 /* limit granularity (byte/page units)*/ },
1172 /* GDATA_SEL 2 Data Descriptor for kernel */
1173 { 0x0, /* segment base address */
1174 0xfffff, /* length - all address space */
1175 SDT_MEMRWA, /* segment type */
1176 0, /* segment descriptor priority level */
1177 1, /* segment descriptor present */
1179 1, /* default 32 vs 16 bit size */
1180 1 /* limit granularity (byte/page units)*/ },
1181 /* GPRIV_SEL 3 SMP Per-Processor Private Data Descriptor */
1182 { 0x0, /* segment base address */
1183 0xfffff, /* length - all address space */
1184 SDT_MEMRWA, /* segment type */
1185 0, /* segment descriptor priority level */
1186 1, /* segment descriptor present */
1188 1, /* default 32 vs 16 bit size */
1189 1 /* limit granularity (byte/page units)*/ },
1190 /* GPROC0_SEL 4 Proc 0 Tss Descriptor */
1192 0x0, /* segment base address */
1193 sizeof(struct i386tss)-1,/* length - all address space */
1194 SDT_SYS386TSS, /* segment type */
1195 0, /* segment descriptor priority level */
1196 1, /* segment descriptor present */
1198 0, /* unused - default 32 vs 16 bit size */
1199 0 /* limit granularity (byte/page units)*/ },
1200 /* GLDT_SEL 5 LDT Descriptor */
1201 { (int) ldt, /* segment base address */
1202 sizeof(ldt)-1, /* length - all address space */
1203 SDT_SYSLDT, /* segment type */
1204 SEL_UPL, /* segment descriptor priority level */
1205 1, /* segment descriptor present */
1207 0, /* unused - default 32 vs 16 bit size */
1208 0 /* limit granularity (byte/page units)*/ },
1209 /* GUSERLDT_SEL 6 User LDT Descriptor per process */
1210 { (int) ldt, /* segment base address */
1211 (512 * sizeof(union descriptor)-1), /* length */
1212 SDT_SYSLDT, /* segment type */
1213 0, /* segment descriptor priority level */
1214 1, /* segment descriptor present */
1216 0, /* unused - default 32 vs 16 bit size */
1217 0 /* limit granularity (byte/page units)*/ },
1218 /* GTGATE_SEL 7 Null Descriptor - Placeholder */
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 /* GBIOSLOWMEM_SEL 8 BIOS access to realmode segment 0x40, must be #8 in GDT */
1228 { 0x400, /* segment base address */
1229 0xfffff, /* length */
1230 SDT_MEMRWA, /* segment type */
1231 0, /* 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 /* GPANIC_SEL 9 Panic Tss Descriptor */
1237 { (int) &dblfault_tss, /* segment base address */
1238 sizeof(struct i386tss)-1,/* length - all address space */
1239 SDT_SYS386TSS, /* segment type */
1240 0, /* segment descriptor priority level */
1241 1, /* segment descriptor present */
1243 0, /* unused - default 32 vs 16 bit size */
1244 0 /* limit granularity (byte/page units)*/ },
1245 /* GBIOSCODE32_SEL 10 BIOS 32-bit interface (32bit Code) */
1246 { 0, /* segment base address (overwritten) */
1247 0xfffff, /* length */
1248 SDT_MEMERA, /* segment type */
1249 0, /* segment descriptor priority level */
1250 1, /* segment descriptor present */
1252 0, /* default 32 vs 16 bit size */
1253 1 /* limit granularity (byte/page units)*/ },
1254 /* GBIOSCODE16_SEL 11 BIOS 32-bit interface (16bit Code) */
1255 { 0, /* segment base address (overwritten) */
1256 0xfffff, /* length */
1257 SDT_MEMERA, /* segment type */
1258 0, /* segment descriptor priority level */
1259 1, /* segment descriptor present */
1261 0, /* default 32 vs 16 bit size */
1262 1 /* limit granularity (byte/page units)*/ },
1263 /* GBIOSDATA_SEL 12 BIOS 32-bit interface (Data) */
1264 { 0, /* segment base address (overwritten) */
1265 0xfffff, /* length */
1266 SDT_MEMRWA, /* segment type */
1267 0, /* segment descriptor priority level */
1268 1, /* segment descriptor present */
1270 1, /* default 32 vs 16 bit size */
1271 1 /* limit granularity (byte/page units)*/ },
1272 /* GBIOSUTIL_SEL 13 BIOS 16-bit interface (Utility) */
1273 { 0, /* segment base address (overwritten) */
1274 0xfffff, /* length */
1275 SDT_MEMRWA, /* segment type */
1276 0, /* segment descriptor priority level */
1277 1, /* segment descriptor present */
1279 0, /* default 32 vs 16 bit size */
1280 1 /* limit granularity (byte/page units)*/ },
1281 /* GBIOSARGS_SEL 14 BIOS 16-bit interface (Arguments) */
1282 { 0, /* segment base address (overwritten) */
1283 0xfffff, /* length */
1284 SDT_MEMRWA, /* segment type */
1285 0, /* segment descriptor priority level */
1286 1, /* segment descriptor present */
1288 0, /* default 32 vs 16 bit size */
1289 1 /* limit granularity (byte/page units)*/ },
1290 /* GTLS_START 15 TLS */
1291 { 0x0, /* segment base address */
1293 0, /* segment type */
1294 0, /* segment descriptor priority level */
1295 0, /* segment descriptor present */
1297 0, /* default 32 vs 16 bit size */
1298 0 /* limit granularity (byte/page units)*/ },
1299 /* GTLS_START+1 16 TLS */
1300 { 0x0, /* segment base address */
1302 0, /* segment type */
1303 0, /* segment descriptor priority level */
1304 0, /* segment descriptor present */
1306 0, /* default 32 vs 16 bit size */
1307 0 /* limit granularity (byte/page units)*/ },
1308 /* GTLS_END 17 TLS */
1309 { 0x0, /* segment base address */
1311 0, /* segment type */
1312 0, /* segment descriptor priority level */
1313 0, /* segment descriptor present */
1315 0, /* default 32 vs 16 bit size */
1316 0 /* limit granularity (byte/page units)*/ },
1319 static struct soft_segment_descriptor ldt_segs[] = {
1320 /* Null Descriptor - overwritten by call gate */
1321 { 0x0, /* segment base address */
1322 0x0, /* length - all address space */
1323 0, /* segment type */
1324 0, /* segment descriptor priority level */
1325 0, /* segment descriptor present */
1327 0, /* default 32 vs 16 bit size */
1328 0 /* limit granularity (byte/page units)*/ },
1329 /* Null Descriptor - overwritten by call gate */
1330 { 0x0, /* segment base address */
1331 0x0, /* length - all address space */
1332 0, /* segment type */
1333 0, /* segment descriptor priority level */
1334 0, /* segment descriptor present */
1336 0, /* default 32 vs 16 bit size */
1337 0 /* limit granularity (byte/page units)*/ },
1338 /* Null Descriptor - overwritten by call gate */
1339 { 0x0, /* segment base address */
1340 0x0, /* length - all address space */
1341 0, /* segment type */
1342 0, /* segment descriptor priority level */
1343 0, /* segment descriptor present */
1345 0, /* default 32 vs 16 bit size */
1346 0 /* limit granularity (byte/page units)*/ },
1347 /* Code Descriptor for user */
1348 { 0x0, /* segment base address */
1349 0xfffff, /* length - all address space */
1350 SDT_MEMERA, /* segment type */
1351 SEL_UPL, /* segment descriptor priority level */
1352 1, /* segment descriptor present */
1354 1, /* default 32 vs 16 bit size */
1355 1 /* limit granularity (byte/page units)*/ },
1356 /* Null Descriptor - overwritten by call gate */
1357 { 0x0, /* segment base address */
1358 0x0, /* length - all address space */
1359 0, /* segment type */
1360 0, /* segment descriptor priority level */
1361 0, /* segment descriptor present */
1363 0, /* default 32 vs 16 bit size */
1364 0 /* limit granularity (byte/page units)*/ },
1365 /* Data Descriptor for user */
1366 { 0x0, /* segment base address */
1367 0xfffff, /* length - all address space */
1368 SDT_MEMRWA, /* segment type */
1369 SEL_UPL, /* segment descriptor priority level */
1370 1, /* segment descriptor present */
1372 1, /* default 32 vs 16 bit size */
1373 1 /* limit granularity (byte/page units)*/ },
1377 setidt(int idx, inthand_t *func, int typ, int dpl, int selec)
1379 struct gate_descriptor *ip;
1382 ip->gd_looffset = (int)func;
1383 ip->gd_selector = selec;
1389 ip->gd_hioffset = ((int)func)>>16 ;
1392 #define IDTVEC(name) __CONCAT(X,name)
1395 IDTVEC(div), IDTVEC(dbg), IDTVEC(nmi), IDTVEC(bpt), IDTVEC(ofl),
1396 IDTVEC(bnd), IDTVEC(ill), IDTVEC(dna), IDTVEC(fpusegm),
1397 IDTVEC(tss), IDTVEC(missing), IDTVEC(stk), IDTVEC(prot),
1398 IDTVEC(page), IDTVEC(mchk), IDTVEC(fpu), IDTVEC(align),
1399 IDTVEC(xmm), IDTVEC(syscall),
1402 IDTVEC(int0x80_syscall);
1404 #ifdef DEBUG_INTERRUPTS
1405 extern inthand_t *Xrsvdary[256];
1409 sdtossd(struct segment_descriptor *sd, struct soft_segment_descriptor *ssd)
1411 ssd->ssd_base = (sd->sd_hibase << 24) | sd->sd_lobase;
1412 ssd->ssd_limit = (sd->sd_hilimit << 16) | sd->sd_lolimit;
1413 ssd->ssd_type = sd->sd_type;
1414 ssd->ssd_dpl = sd->sd_dpl;
1415 ssd->ssd_p = sd->sd_p;
1416 ssd->ssd_def32 = sd->sd_def32;
1417 ssd->ssd_gran = sd->sd_gran;
1421 * Populate the (physmap) array with base/bound pairs describing the
1422 * available physical memory in the system, then test this memory and
1423 * build the phys_avail array describing the actually-available memory.
1425 * If we cannot accurately determine the physical memory map, then use
1426 * value from the 0xE801 call, and failing that, the RTC.
1428 * Total memory size may be set by the kernel environment variable
1429 * hw.physmem or the compile-time define MAXMEM.
1432 getmemsize(int first)
1434 int i, physmap_idx, pa_indx, da_indx;
1436 u_int basemem, extmem;
1437 struct vm86frame vmf;
1438 struct vm86context vmc;
1440 vm_offset_t physmap[PHYSMAP_ENTRIES*2];
1448 quad_t dcons_addr, dcons_size;
1450 bzero(&vmf, sizeof(struct vm86frame));
1451 bzero(physmap, sizeof(physmap));
1455 * Some newer BIOSes has broken INT 12H implementation which cause
1456 * kernel panic immediately. In this case, we need to scan SMAP
1457 * with INT 15:E820 first, then determine base memory size.
1460 TUNABLE_INT_FETCH("hw.hasbrokenint12", &hasbrokenint12);
1461 if (hasbrokenint12) {
1466 * Perform "base memory" related probes & setup. If we get a crazy
1467 * value give the bios some scribble space just in case.
1469 vm86_intcall(0x12, &vmf);
1470 basemem = vmf.vmf_ax;
1471 if (basemem > 640) {
1472 kprintf("Preposterous BIOS basemem of %uK, "
1473 "truncating to < 640K\n", basemem);
1478 * XXX if biosbasemem is now < 640, there is a `hole'
1479 * between the end of base memory and the start of
1480 * ISA memory. The hole may be empty or it may
1481 * contain BIOS code or data. Map it read/write so
1482 * that the BIOS can write to it. (Memory from 0 to
1483 * the physical end of the kernel is mapped read-only
1484 * to begin with and then parts of it are remapped.
1485 * The parts that aren't remapped form holes that
1486 * remain read-only and are unused by the kernel.
1487 * The base memory area is below the physical end of
1488 * the kernel and right now forms a read-only hole.
1489 * The part of it from PAGE_SIZE to
1490 * (trunc_page(biosbasemem * 1024) - 1) will be
1491 * remapped and used by the kernel later.)
1493 * This code is similar to the code used in
1494 * pmap_mapdev, but since no memory needs to be
1495 * allocated we simply change the mapping.
1497 for (pa = trunc_page(basemem * 1024);
1498 pa < ISA_HOLE_START; pa += PAGE_SIZE) {
1499 pte = vtopte(pa + KERNBASE);
1500 *pte = pa | PG_RW | PG_V;
1504 * if basemem != 640, map pages r/w into vm86 page table so
1505 * that the bios can scribble on it.
1508 for (i = basemem / 4; i < 160; i++)
1509 pte[i] = (i << PAGE_SHIFT) | PG_V | PG_RW | PG_U;
1513 * map page 1 R/W into the kernel page table so we can use it
1514 * as a buffer. The kernel will unmap this page later.
1516 pte = vtopte(KERNBASE + (1 << PAGE_SHIFT));
1517 *pte = (1 << PAGE_SHIFT) | PG_RW | PG_V;
1520 * get memory map with INT 15:E820
1522 #define SMAPSIZ sizeof(*smap)
1523 #define SMAP_SIG 0x534D4150 /* 'SMAP' */
1526 smap = (void *)vm86_addpage(&vmc, 1, KERNBASE + (1 << PAGE_SHIFT));
1527 vm86_getptr(&vmc, (vm_offset_t)smap, &vmf.vmf_es, &vmf.vmf_di);
1532 vmf.vmf_eax = 0xE820;
1533 vmf.vmf_edx = SMAP_SIG;
1534 vmf.vmf_ecx = SMAPSIZ;
1535 i = vm86_datacall(0x15, &vmf, &vmc);
1536 if (i || vmf.vmf_eax != SMAP_SIG)
1538 if (boothowto & RB_VERBOSE)
1539 kprintf("SMAP type=%02x base=%08x %08x len=%08x %08x\n",
1541 *(u_int32_t *)((char *)&smap->base + 4),
1542 (u_int32_t)smap->base,
1543 *(u_int32_t *)((char *)&smap->length + 4),
1544 (u_int32_t)smap->length);
1546 if (smap->type != 0x01)
1549 if (smap->length == 0)
1552 Realmem += smap->length;
1554 if (smap->base >= 0xffffffffLLU) {
1555 kprintf("%ju MB of memory above 4GB ignored\n",
1556 (uintmax_t)(smap->length / 1024 / 1024));
1560 for (i = 0; i <= physmap_idx; i += 2) {
1561 if (smap->base < physmap[i + 1]) {
1562 if (boothowto & RB_VERBOSE) {
1563 kprintf("Overlapping or non-montonic "
1564 "memory region, ignoring "
1567 Realmem -= smap->length;
1572 if (smap->base == physmap[physmap_idx + 1]) {
1573 physmap[physmap_idx + 1] += smap->length;
1578 if (physmap_idx == PHYSMAP_ENTRIES*2) {
1579 kprintf("Too many segments in the physical "
1580 "address map, giving up\n");
1583 physmap[physmap_idx] = smap->base;
1584 physmap[physmap_idx + 1] = smap->base + smap->length;
1586 ; /* fix GCC3.x warning */
1587 } while (vmf.vmf_ebx != 0);
1590 * Perform "base memory" related probes & setup based on SMAP
1593 for (i = 0; i <= physmap_idx; i += 2) {
1594 if (physmap[i] == 0x00000000) {
1595 basemem = physmap[i + 1] / 1024;
1604 if (basemem > 640) {
1605 kprintf("Preposterous BIOS basemem of %uK, "
1606 "truncating to 640K\n", basemem);
1610 for (pa = trunc_page(basemem * 1024);
1611 pa < ISA_HOLE_START; pa += PAGE_SIZE) {
1612 pte = vtopte(pa + KERNBASE);
1613 *pte = pa | PG_RW | PG_V;
1617 for (i = basemem / 4; i < 160; i++)
1618 pte[i] = (i << PAGE_SHIFT) | PG_V | PG_RW | PG_U;
1621 if (physmap[1] != 0)
1625 * If we failed above, try memory map with INT 15:E801
1627 vmf.vmf_ax = 0xE801;
1628 if (vm86_intcall(0x15, &vmf) == 0) {
1629 extmem = vmf.vmf_cx + vmf.vmf_dx * 64;
1633 vm86_intcall(0x15, &vmf);
1634 extmem = vmf.vmf_ax;
1637 * Prefer the RTC value for extended memory.
1639 extmem = rtcin(RTC_EXTLO) + (rtcin(RTC_EXTHI) << 8);
1644 * Special hack for chipsets that still remap the 384k hole when
1645 * there's 16MB of memory - this really confuses people that
1646 * are trying to use bus mastering ISA controllers with the
1647 * "16MB limit"; they only have 16MB, but the remapping puts
1648 * them beyond the limit.
1650 * If extended memory is between 15-16MB (16-17MB phys address range),
1653 if ((extmem > 15 * 1024) && (extmem < 16 * 1024))
1657 physmap[1] = basemem * 1024;
1659 physmap[physmap_idx] = 0x100000;
1660 physmap[physmap_idx + 1] = physmap[physmap_idx] + extmem * 1024;
1664 * Now, physmap contains a map of physical memory.
1668 /* make hole for AP bootstrap code YYY */
1669 physmap[1] = mp_bootaddress(physmap[1]);
1671 /* Save EBDA address, if any */
1672 ebda_addr = (u_long)(*(u_short *)(KERNBASE + 0x40e));
1677 * Maxmem isn't the "maximum memory", it's one larger than the
1678 * highest page of the physical address space. It should be
1679 * called something like "Maxphyspage". We may adjust this
1680 * based on ``hw.physmem'' and the results of the memory test.
1682 Maxmem = atop(physmap[physmap_idx + 1]);
1685 Maxmem = MAXMEM / 4;
1688 if (kgetenv_quad("hw.physmem", &maxmem))
1689 Maxmem = atop(maxmem);
1691 if (atop(physmap[physmap_idx + 1]) != Maxmem &&
1692 (boothowto & RB_VERBOSE))
1693 kprintf("Physical memory use set to %lluK\n", Maxmem * 4);
1696 * If Maxmem has been increased beyond what the system has detected,
1697 * extend the last memory segment to the new limit.
1699 if (atop(physmap[physmap_idx + 1]) < Maxmem)
1700 physmap[physmap_idx + 1] = ptoa(Maxmem);
1702 /* call pmap initialization to make new kernel address space */
1703 pmap_bootstrap(first, 0);
1706 * Size up each available chunk of physical memory.
1708 physmap[0] = PAGE_SIZE; /* mask off page 0 */
1711 phys_avail[pa_indx++] = physmap[0];
1712 phys_avail[pa_indx] = physmap[0];
1713 dump_avail[da_indx] = physmap[0];
1718 * Get dcons buffer address
1720 if (kgetenv_quad("dcons.addr", &dcons_addr) == 0 ||
1721 kgetenv_quad("dcons.size", &dcons_size) == 0)
1725 * physmap is in bytes, so when converting to page boundaries,
1726 * round up the start address and round down the end address.
1728 for (i = 0; i <= physmap_idx; i += 2) {
1732 if (physmap[i + 1] < end)
1733 end = trunc_page(physmap[i + 1]);
1734 for (pa = round_page(physmap[i]); pa < end; pa += PAGE_SIZE) {
1735 int tmp, page_bad, full;
1739 int *ptr = (int *)CADDR1;
1744 * block out kernel memory as not available.
1746 if (pa >= 0x100000 && pa < first)
1750 * block out dcons buffer
1753 && pa >= trunc_page(dcons_addr)
1754 && pa < dcons_addr + dcons_size)
1760 * map page into kernel: valid, read/write,non-cacheable
1762 *pte = pa | PG_V | PG_RW | PG_N;
1767 * Test for alternating 1's and 0's
1769 *(volatile int *)ptr = 0xaaaaaaaa;
1770 if (*(volatile int *)ptr != 0xaaaaaaaa) {
1774 * Test for alternating 0's and 1's
1776 *(volatile int *)ptr = 0x55555555;
1777 if (*(volatile int *)ptr != 0x55555555) {
1783 *(volatile int *)ptr = 0xffffffff;
1784 if (*(volatile int *)ptr != 0xffffffff) {
1790 *(volatile int *)ptr = 0x0;
1791 if (*(volatile int *)ptr != 0x0) {
1795 * Restore original value.
1800 * Adjust array of valid/good pages.
1802 if (page_bad == TRUE) {
1806 * If this good page is a continuation of the
1807 * previous set of good pages, then just increase
1808 * the end pointer. Otherwise start a new chunk.
1809 * Note that "end" points one higher than end,
1810 * making the range >= start and < end.
1811 * If we're also doing a speculative memory
1812 * test and we at or past the end, bump up Maxmem
1813 * so that we keep going. The first bad page
1814 * will terminate the loop.
1816 if (phys_avail[pa_indx] == pa) {
1817 phys_avail[pa_indx] += PAGE_SIZE;
1820 if (pa_indx >= PHYSMAP_ENTRIES*2) {
1821 kprintf("Too many holes in the physical address space, giving up\n");
1826 phys_avail[pa_indx++] = pa; /* start */
1827 phys_avail[pa_indx] = pa + PAGE_SIZE; /* end */
1831 if (dump_avail[da_indx] == pa) {
1832 dump_avail[da_indx] += PAGE_SIZE;
1835 if (da_indx >= PHYSMAP_ENTRIES*2) {
1839 dump_avail[da_indx++] = pa; /* start */
1840 dump_avail[da_indx] = pa + PAGE_SIZE; /* end */
1853 * The last chunk must contain at least one page plus the message
1854 * buffer to avoid complicating other code (message buffer address
1855 * calculation, etc.).
1857 while (phys_avail[pa_indx - 1] + PAGE_SIZE +
1858 round_page(MSGBUF_SIZE) >= phys_avail[pa_indx]) {
1859 physmem -= atop(phys_avail[pa_indx] - phys_avail[pa_indx - 1]);
1860 phys_avail[pa_indx--] = 0;
1861 phys_avail[pa_indx--] = 0;
1864 Maxmem = atop(phys_avail[pa_indx]);
1866 /* Trim off space for the message buffer. */
1867 phys_avail[pa_indx] -= round_page(MSGBUF_SIZE);
1869 avail_end = phys_avail[pa_indx];
1874 int apic_io_enable = 1; /* Enabled by default for kernels compiled w/APIC_IO */
1876 int apic_io_enable = 0; /* Disabled by default for kernels compiled without */
1878 TUNABLE_INT("hw.apic_io_enable", &apic_io_enable);
1879 extern struct machintr_abi MachIntrABI_APIC;
1882 extern struct machintr_abi MachIntrABI_ICU;
1883 struct machintr_abi MachIntrABI;
1894 * 7 Device Not Available (x87)
1896 * 9 Coprocessor Segment overrun (unsupported, reserved)
1898 * 11 Segment not present
1900 * 13 General Protection
1903 * 16 x87 FP Exception pending
1904 * 17 Alignment Check
1906 * 19 SIMD floating point
1908 * 32-255 INTn/external sources
1913 struct gate_descriptor *gdp;
1914 int gsel_tss, metadata_missing, off, x;
1915 struct mdglobaldata *gd;
1918 * Prevent lowering of the ipl if we call tsleep() early.
1920 gd = &CPU_prvspace[0].mdglobaldata;
1921 bzero(gd, sizeof(*gd));
1923 gd->mi.gd_curthread = &thread0;
1924 thread0.td_gd = &gd->mi;
1926 atdevbase = ISA_HOLE_START + KERNBASE;
1928 metadata_missing = 0;
1929 if (bootinfo.bi_modulep) {
1930 preload_metadata = (caddr_t)bootinfo.bi_modulep + KERNBASE;
1931 preload_bootstrap_relocate(KERNBASE);
1933 metadata_missing = 1;
1935 if (bootinfo.bi_envp)
1936 kern_envp = (caddr_t)bootinfo.bi_envp + KERNBASE;
1939 * Default MachIntrABI to ICU
1941 MachIntrABI = MachIntrABI_ICU;
1943 TUNABLE_INT_FETCH("hw.apic_io_enable", &apic_io_enable);
1947 * start with one cpu. Note: with one cpu, ncpus2_shift, ncpus2_mask,
1948 * and ncpus_fit_mask remain 0.
1953 /* Init basic tunables, hz etc */
1957 * make gdt memory segments, the code segment goes up to end of the
1958 * page with etext in it, the data segment goes to the end of
1962 * XXX text protection is temporarily (?) disabled. The limit was
1963 * i386_btop(round_page(etext)) - 1.
1965 gdt_segs[GCODE_SEL].ssd_limit = atop(0 - 1);
1966 gdt_segs[GDATA_SEL].ssd_limit = atop(0 - 1);
1968 gdt_segs[GPRIV_SEL].ssd_limit =
1969 atop(sizeof(struct privatespace) - 1);
1970 gdt_segs[GPRIV_SEL].ssd_base = (int) &CPU_prvspace[0];
1971 gdt_segs[GPROC0_SEL].ssd_base =
1972 (int) &CPU_prvspace[0].mdglobaldata.gd_common_tss;
1974 gd->mi.gd_prvspace = &CPU_prvspace[0];
1977 * Note: on both UP and SMP curthread must be set non-NULL
1978 * early in the boot sequence because the system assumes
1979 * that 'curthread' is never NULL.
1982 for (x = 0; x < NGDT; x++) {
1984 /* avoid overwriting db entries with APM ones */
1985 if (x >= GAPMCODE32_SEL && x <= GAPMDATA_SEL)
1988 ssdtosd(&gdt_segs[x], &gdt[x].sd);
1991 r_gdt.rd_limit = NGDT * sizeof(gdt[0]) - 1;
1992 r_gdt.rd_base = (int) gdt;
1995 mi_gdinit(&gd->mi, 0);
1997 mi_proc0init(&gd->mi, proc0paddr);
1998 safepri = TDPRI_MAX;
2000 /* make ldt memory segments */
2002 * XXX - VM_MAX_USER_ADDRESS is an end address, not a max. And it
2003 * should be spelled ...MAX_USER...
2005 ldt_segs[LUCODE_SEL].ssd_limit = atop(VM_MAX_USER_ADDRESS - 1);
2006 ldt_segs[LUDATA_SEL].ssd_limit = atop(VM_MAX_USER_ADDRESS - 1);
2007 for (x = 0; x < sizeof ldt_segs / sizeof ldt_segs[0]; x++)
2008 ssdtosd(&ldt_segs[x], &ldt[x].sd);
2010 _default_ldt = GSEL(GLDT_SEL, SEL_KPL);
2012 gd->gd_currentldt = _default_ldt;
2013 /* spinlocks and the BGL */
2017 * Setup the hardware exception table. Most exceptions use
2018 * SDT_SYS386TGT, known as a 'trap gate'. Trap gates leave
2019 * interrupts enabled. VM page faults use SDT_SYS386IGT, known as
2020 * an 'interrupt trap gate', which disables interrupts on entry,
2021 * in order to be able to poll the appropriate CRn register to
2022 * determine the fault address.
2024 for (x = 0; x < NIDT; x++) {
2025 #ifdef DEBUG_INTERRUPTS
2026 setidt(x, Xrsvdary[x], SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
2028 setidt(x, &IDTVEC(rsvd0), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
2031 setidt(0, &IDTVEC(div), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
2032 setidt(1, &IDTVEC(dbg), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
2033 setidt(2, &IDTVEC(nmi), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
2034 setidt(3, &IDTVEC(bpt), SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL));
2035 setidt(4, &IDTVEC(ofl), SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL));
2036 setidt(5, &IDTVEC(bnd), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
2037 setidt(6, &IDTVEC(ill), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
2038 setidt(7, &IDTVEC(dna), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
2039 setidt(8, 0, SDT_SYSTASKGT, SEL_KPL, GSEL(GPANIC_SEL, SEL_KPL));
2040 setidt(9, &IDTVEC(fpusegm), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
2041 setidt(10, &IDTVEC(tss), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
2042 setidt(11, &IDTVEC(missing), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
2043 setidt(12, &IDTVEC(stk), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
2044 setidt(13, &IDTVEC(prot), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
2045 setidt(14, &IDTVEC(page), SDT_SYS386IGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
2046 setidt(15, &IDTVEC(rsvd0), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
2047 setidt(16, &IDTVEC(fpu), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
2048 setidt(17, &IDTVEC(align), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
2049 setidt(18, &IDTVEC(mchk), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
2050 setidt(19, &IDTVEC(xmm), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
2051 setidt(0x80, &IDTVEC(int0x80_syscall),
2052 SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL));
2054 r_idt.rd_limit = sizeof(idt0) - 1;
2055 r_idt.rd_base = (int) idt;
2059 * Initialize the console before we print anything out.
2063 if (metadata_missing)
2064 kprintf("WARNING: loader(8) metadata is missing!\n");
2074 if (boothowto & RB_KDB)
2075 Debugger("Boot flags requested debugger");
2078 finishidentcpu(); /* Final stage of CPU initialization */
2079 setidt(6, &IDTVEC(ill), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
2080 setidt(13, &IDTVEC(prot), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
2081 initializecpu(); /* Initialize CPU registers */
2084 * make an initial tss so cpu can get interrupt stack on syscall!
2085 * The 16 bytes is to save room for a VM86 context.
2087 gd->gd_common_tss.tss_esp0 = (int) thread0.td_pcb - 16;
2088 gd->gd_common_tss.tss_ss0 = GSEL(GDATA_SEL, SEL_KPL) ;
2089 gsel_tss = GSEL(GPROC0_SEL, SEL_KPL);
2090 gd->gd_tss_gdt = &gdt[GPROC0_SEL].sd;
2091 gd->gd_common_tssd = *gd->gd_tss_gdt;
2092 gd->gd_common_tss.tss_ioopt = (sizeof gd->gd_common_tss) << 16;
2095 dblfault_tss.tss_esp = dblfault_tss.tss_esp0 = dblfault_tss.tss_esp1 =
2096 dblfault_tss.tss_esp2 = (int) &dblfault_stack[sizeof(dblfault_stack)];
2097 dblfault_tss.tss_ss = dblfault_tss.tss_ss0 = dblfault_tss.tss_ss1 =
2098 dblfault_tss.tss_ss2 = GSEL(GDATA_SEL, SEL_KPL);
2099 dblfault_tss.tss_cr3 = (int)IdlePTD;
2100 dblfault_tss.tss_eip = (int) dblfault_handler;
2101 dblfault_tss.tss_eflags = PSL_KERNEL;
2102 dblfault_tss.tss_ds = dblfault_tss.tss_es =
2103 dblfault_tss.tss_gs = GSEL(GDATA_SEL, SEL_KPL);
2104 dblfault_tss.tss_fs = GSEL(GPRIV_SEL, SEL_KPL);
2105 dblfault_tss.tss_cs = GSEL(GCODE_SEL, SEL_KPL);
2106 dblfault_tss.tss_ldt = GSEL(GLDT_SEL, SEL_KPL);
2110 init_param2(physmem);
2112 /* now running on new page tables, configured,and u/iom is accessible */
2114 /* Map the message buffer. */
2115 for (off = 0; off < round_page(MSGBUF_SIZE); off += PAGE_SIZE)
2116 pmap_kenter((vm_offset_t)msgbufp + off, avail_end + off);
2118 msgbufinit(msgbufp, MSGBUF_SIZE);
2120 /* make a call gate to reenter kernel with */
2121 gdp = &ldt[LSYS5CALLS_SEL].gd;
2123 x = (int) &IDTVEC(syscall);
2124 gdp->gd_looffset = x++;
2125 gdp->gd_selector = GSEL(GCODE_SEL,SEL_KPL);
2127 gdp->gd_type = SDT_SYS386CGT;
2128 gdp->gd_dpl = SEL_UPL;
2130 gdp->gd_hioffset = ((int) &IDTVEC(syscall)) >>16;
2132 /* XXX does this work? */
2133 ldt[LBSDICALLS_SEL] = ldt[LSYS5CALLS_SEL];
2134 ldt[LSOL26CALLS_SEL] = ldt[LSYS5CALLS_SEL];
2136 /* transfer to user mode */
2138 _ucodesel = LSEL(LUCODE_SEL, SEL_UPL);
2139 _udatasel = LSEL(LUDATA_SEL, SEL_UPL);
2141 /* setup proc 0's pcb */
2142 thread0.td_pcb->pcb_flags = 0;
2143 thread0.td_pcb->pcb_cr3 = (int)IdlePTD; /* should already be setup */
2144 thread0.td_pcb->pcb_ext = 0;
2145 lwp0.lwp_md.md_regs = &proc0_tf;
2149 * Initialize machine-dependant portions of the global data structure.
2150 * Note that the global data area and cpu0's idlestack in the private
2151 * data space were allocated in locore.
2153 * Note: the idlethread's cpl is 0
2155 * WARNING! Called from early boot, 'mycpu' may not work yet.
2158 cpu_gdinit(struct mdglobaldata *gd, int cpu)
2161 gd->mi.gd_curthread = &gd->mi.gd_idlethread;
2163 lwkt_init_thread(&gd->mi.gd_idlethread,
2164 gd->mi.gd_prvspace->idlestack,
2165 sizeof(gd->mi.gd_prvspace->idlestack),
2167 lwkt_set_comm(&gd->mi.gd_idlethread, "idle_%d", cpu);
2168 gd->mi.gd_idlethread.td_switch = cpu_lwkt_switch;
2169 gd->mi.gd_idlethread.td_sp -= sizeof(void *);
2170 *(void **)gd->mi.gd_idlethread.td_sp = cpu_idle_restore;
2174 is_globaldata_space(vm_offset_t saddr, vm_offset_t eaddr)
2176 if (saddr >= (vm_offset_t)&CPU_prvspace[0] &&
2177 eaddr <= (vm_offset_t)&CPU_prvspace[MAXCPU]) {
2184 globaldata_find(int cpu)
2186 KKASSERT(cpu >= 0 && cpu < ncpus);
2187 return(&CPU_prvspace[cpu].mdglobaldata.mi);
2190 #if defined(I586_CPU) && !defined(NO_F00F_HACK)
2191 static void f00f_hack(void *unused);
2192 SYSINIT(f00f_hack, SI_BOOT2_BIOS, SI_ORDER_ANY, f00f_hack, NULL);
2195 f00f_hack(void *unused)
2197 struct gate_descriptor *new_idt;
2203 kprintf("Intel Pentium detected, installing workaround for F00F bug\n");
2205 r_idt.rd_limit = sizeof(idt0) - 1;
2207 tmp = kmem_alloc(&kernel_map, PAGE_SIZE * 2);
2209 panic("kmem_alloc returned 0");
2210 if (((unsigned int)tmp & (PAGE_SIZE-1)) != 0)
2211 panic("kmem_alloc returned non-page-aligned memory");
2212 /* Put the first seven entries in the lower page */
2213 new_idt = (struct gate_descriptor*)(tmp + PAGE_SIZE - (7*8));
2214 bcopy(idt, new_idt, sizeof(idt0));
2215 r_idt.rd_base = (int)new_idt;
2218 if (vm_map_protect(&kernel_map, tmp, tmp + PAGE_SIZE,
2219 VM_PROT_READ, FALSE) != KERN_SUCCESS)
2220 panic("vm_map_protect failed");
2223 #endif /* defined(I586_CPU) && !NO_F00F_HACK */
2226 ptrace_set_pc(struct lwp *lp, unsigned long addr)
2228 lp->lwp_md.md_regs->tf_eip = addr;
2233 ptrace_single_step(struct lwp *lp)
2235 lp->lwp_md.md_regs->tf_eflags |= PSL_T;
2240 fill_regs(struct lwp *lp, struct reg *regs)
2242 struct trapframe *tp;
2244 tp = lp->lwp_md.md_regs;
2245 regs->r_gs = tp->tf_gs;
2246 regs->r_fs = tp->tf_fs;
2247 regs->r_es = tp->tf_es;
2248 regs->r_ds = tp->tf_ds;
2249 regs->r_edi = tp->tf_edi;
2250 regs->r_esi = tp->tf_esi;
2251 regs->r_ebp = tp->tf_ebp;
2252 regs->r_ebx = tp->tf_ebx;
2253 regs->r_edx = tp->tf_edx;
2254 regs->r_ecx = tp->tf_ecx;
2255 regs->r_eax = tp->tf_eax;
2256 regs->r_eip = tp->tf_eip;
2257 regs->r_cs = tp->tf_cs;
2258 regs->r_eflags = tp->tf_eflags;
2259 regs->r_esp = tp->tf_esp;
2260 regs->r_ss = tp->tf_ss;
2265 set_regs(struct lwp *lp, struct reg *regs)
2267 struct trapframe *tp;
2269 tp = lp->lwp_md.md_regs;
2270 if (!EFL_SECURE(regs->r_eflags, tp->tf_eflags) ||
2271 !CS_SECURE(regs->r_cs))
2273 tp->tf_gs = regs->r_gs;
2274 tp->tf_fs = regs->r_fs;
2275 tp->tf_es = regs->r_es;
2276 tp->tf_ds = regs->r_ds;
2277 tp->tf_edi = regs->r_edi;
2278 tp->tf_esi = regs->r_esi;
2279 tp->tf_ebp = regs->r_ebp;
2280 tp->tf_ebx = regs->r_ebx;
2281 tp->tf_edx = regs->r_edx;
2282 tp->tf_ecx = regs->r_ecx;
2283 tp->tf_eax = regs->r_eax;
2284 tp->tf_eip = regs->r_eip;
2285 tp->tf_cs = regs->r_cs;
2286 tp->tf_eflags = regs->r_eflags;
2287 tp->tf_esp = regs->r_esp;
2288 tp->tf_ss = regs->r_ss;
2292 #ifndef CPU_DISABLE_SSE
2294 fill_fpregs_xmm(struct savexmm *sv_xmm, struct save87 *sv_87)
2296 struct env87 *penv_87 = &sv_87->sv_env;
2297 struct envxmm *penv_xmm = &sv_xmm->sv_env;
2300 /* FPU control/status */
2301 penv_87->en_cw = penv_xmm->en_cw;
2302 penv_87->en_sw = penv_xmm->en_sw;
2303 penv_87->en_tw = penv_xmm->en_tw;
2304 penv_87->en_fip = penv_xmm->en_fip;
2305 penv_87->en_fcs = penv_xmm->en_fcs;
2306 penv_87->en_opcode = penv_xmm->en_opcode;
2307 penv_87->en_foo = penv_xmm->en_foo;
2308 penv_87->en_fos = penv_xmm->en_fos;
2311 for (i = 0; i < 8; ++i)
2312 sv_87->sv_ac[i] = sv_xmm->sv_fp[i].fp_acc;
2314 sv_87->sv_ex_sw = sv_xmm->sv_ex_sw;
2318 set_fpregs_xmm(struct save87 *sv_87, struct savexmm *sv_xmm)
2320 struct env87 *penv_87 = &sv_87->sv_env;
2321 struct envxmm *penv_xmm = &sv_xmm->sv_env;
2324 /* FPU control/status */
2325 penv_xmm->en_cw = penv_87->en_cw;
2326 penv_xmm->en_sw = penv_87->en_sw;
2327 penv_xmm->en_tw = penv_87->en_tw;
2328 penv_xmm->en_fip = penv_87->en_fip;
2329 penv_xmm->en_fcs = penv_87->en_fcs;
2330 penv_xmm->en_opcode = penv_87->en_opcode;
2331 penv_xmm->en_foo = penv_87->en_foo;
2332 penv_xmm->en_fos = penv_87->en_fos;
2335 for (i = 0; i < 8; ++i)
2336 sv_xmm->sv_fp[i].fp_acc = sv_87->sv_ac[i];
2338 sv_xmm->sv_ex_sw = sv_87->sv_ex_sw;
2340 #endif /* CPU_DISABLE_SSE */
2343 fill_fpregs(struct lwp *lp, struct fpreg *fpregs)
2345 #ifndef CPU_DISABLE_SSE
2347 fill_fpregs_xmm(&lp->lwp_thread->td_pcb->pcb_save.sv_xmm,
2348 (struct save87 *)fpregs);
2351 #endif /* CPU_DISABLE_SSE */
2352 bcopy(&lp->lwp_thread->td_pcb->pcb_save.sv_87, fpregs, sizeof *fpregs);
2357 set_fpregs(struct lwp *lp, struct fpreg *fpregs)
2359 #ifndef CPU_DISABLE_SSE
2361 set_fpregs_xmm((struct save87 *)fpregs,
2362 &lp->lwp_thread->td_pcb->pcb_save.sv_xmm);
2365 #endif /* CPU_DISABLE_SSE */
2366 bcopy(fpregs, &lp->lwp_thread->td_pcb->pcb_save.sv_87, sizeof *fpregs);
2371 fill_dbregs(struct lwp *lp, struct dbreg *dbregs)
2374 dbregs->dr0 = rdr0();
2375 dbregs->dr1 = rdr1();
2376 dbregs->dr2 = rdr2();
2377 dbregs->dr3 = rdr3();
2378 dbregs->dr4 = rdr4();
2379 dbregs->dr5 = rdr5();
2380 dbregs->dr6 = rdr6();
2381 dbregs->dr7 = rdr7();
2385 pcb = lp->lwp_thread->td_pcb;
2386 dbregs->dr0 = pcb->pcb_dr0;
2387 dbregs->dr1 = pcb->pcb_dr1;
2388 dbregs->dr2 = pcb->pcb_dr2;
2389 dbregs->dr3 = pcb->pcb_dr3;
2392 dbregs->dr6 = pcb->pcb_dr6;
2393 dbregs->dr7 = pcb->pcb_dr7;
2399 set_dbregs(struct lwp *lp, struct dbreg *dbregs)
2402 load_dr0(dbregs->dr0);
2403 load_dr1(dbregs->dr1);
2404 load_dr2(dbregs->dr2);
2405 load_dr3(dbregs->dr3);
2406 load_dr4(dbregs->dr4);
2407 load_dr5(dbregs->dr5);
2408 load_dr6(dbregs->dr6);
2409 load_dr7(dbregs->dr7);
2412 struct ucred *ucred;
2414 uint32_t mask1, mask2;
2417 * Don't let an illegal value for dr7 get set. Specifically,
2418 * check for undefined settings. Setting these bit patterns
2419 * result in undefined behaviour and can lead to an unexpected
2422 for (i = 0, mask1 = 0x3<<16, mask2 = 0x2<<16; i < 8;
2423 i++, mask1 <<= 2, mask2 <<= 2)
2424 if ((dbregs->dr7 & mask1) == mask2)
2427 pcb = lp->lwp_thread->td_pcb;
2428 ucred = lp->lwp_proc->p_ucred;
2431 * Don't let a process set a breakpoint that is not within the
2432 * process's address space. If a process could do this, it
2433 * could halt the system by setting a breakpoint in the kernel
2434 * (if ddb was enabled). Thus, we need to check to make sure
2435 * that no breakpoints are being enabled for addresses outside
2436 * process's address space, unless, perhaps, we were called by
2439 * XXX - what about when the watched area of the user's
2440 * address space is written into from within the kernel
2441 * ... wouldn't that still cause a breakpoint to be generated
2442 * from within kernel mode?
2445 if (priv_check_cred(ucred, PRIV_ROOT, 0) != 0) {
2446 if (dbregs->dr7 & 0x3) {
2447 /* dr0 is enabled */
2448 if (dbregs->dr0 >= VM_MAX_USER_ADDRESS)
2452 if (dbregs->dr7 & (0x3<<2)) {
2453 /* dr1 is enabled */
2454 if (dbregs->dr1 >= VM_MAX_USER_ADDRESS)
2458 if (dbregs->dr7 & (0x3<<4)) {
2459 /* dr2 is enabled */
2460 if (dbregs->dr2 >= VM_MAX_USER_ADDRESS)
2464 if (dbregs->dr7 & (0x3<<6)) {
2465 /* dr3 is enabled */
2466 if (dbregs->dr3 >= VM_MAX_USER_ADDRESS)
2471 pcb->pcb_dr0 = dbregs->dr0;
2472 pcb->pcb_dr1 = dbregs->dr1;
2473 pcb->pcb_dr2 = dbregs->dr2;
2474 pcb->pcb_dr3 = dbregs->dr3;
2475 pcb->pcb_dr6 = dbregs->dr6;
2476 pcb->pcb_dr7 = dbregs->dr7;
2478 pcb->pcb_flags |= PCB_DBREGS;
2485 * Return > 0 if a hardware breakpoint has been hit, and the
2486 * breakpoint was in user space. Return 0, otherwise.
2489 user_dbreg_trap(void)
2491 u_int32_t dr7, dr6; /* debug registers dr6 and dr7 */
2492 u_int32_t bp; /* breakpoint bits extracted from dr6 */
2493 int nbp; /* number of breakpoints that triggered */
2494 caddr_t addr[4]; /* breakpoint addresses */
2498 if ((dr7 & 0x000000ff) == 0) {
2500 * all GE and LE bits in the dr7 register are zero,
2501 * thus the trap couldn't have been caused by the
2502 * hardware debug registers
2509 bp = dr6 & 0x0000000f;
2513 * None of the breakpoint bits are set meaning this
2514 * trap was not caused by any of the debug registers
2520 * at least one of the breakpoints were hit, check to see
2521 * which ones and if any of them are user space addresses
2525 addr[nbp++] = (caddr_t)rdr0();
2528 addr[nbp++] = (caddr_t)rdr1();
2531 addr[nbp++] = (caddr_t)rdr2();
2534 addr[nbp++] = (caddr_t)rdr3();
2537 for (i=0; i<nbp; i++) {
2539 (caddr_t)VM_MAX_USER_ADDRESS) {
2541 * addr[i] is in user space
2548 * None of the breakpoints are in user space.
2556 Debugger(const char *msg)
2558 kprintf("Debugger(\"%s\") called.\n", msg);
2565 * Provide inb() and outb() as functions. They are normally only
2566 * available as macros calling inlined functions, thus cannot be
2567 * called inside DDB.
2569 * The actual code is stolen from <machine/cpufunc.h>, and de-inlined.
2575 /* silence compiler warnings */
2577 void outb(u_int, u_char);
2584 * We use %%dx and not %1 here because i/o is done at %dx and not at
2585 * %edx, while gcc generates inferior code (movw instead of movl)
2586 * if we tell it to load (u_short) port.
2588 __asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port));
2593 outb(u_int port, u_char data)
2597 * Use an unnecessary assignment to help gcc's register allocator.
2598 * This make a large difference for gcc-1.40 and a tiny difference
2599 * for gcc-2.6.0. For gcc-1.40, al had to be ``asm("ax")'' for
2600 * best results. gcc-2.6.0 can't handle this.
2603 __asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port));
2610 #include "opt_cpu.h"
2614 * initialize all the SMP locks
2617 /* critical region when masking or unmasking interupts */
2618 struct spinlock_deprecated imen_spinlock;
2620 /* critical region for old style disable_intr/enable_intr */
2621 struct spinlock_deprecated mpintr_spinlock;
2623 /* critical region around INTR() routines */
2624 struct spinlock_deprecated intr_spinlock;
2626 /* lock region used by kernel profiling */
2627 struct spinlock_deprecated mcount_spinlock;
2629 /* locks com (tty) data/hardware accesses: a FASTINTR() */
2630 struct spinlock_deprecated com_spinlock;
2632 /* lock regions around the clock hardware */
2633 struct spinlock_deprecated clock_spinlock;
2635 /* lock around the MP rendezvous */
2636 struct spinlock_deprecated smp_rv_spinlock;
2643 * Get the initial mplock with a count of 1 for the BSP.
2644 * This uses a LOGICAL cpu ID, ie BSP == 0.
2646 cpu_get_initial_mplock();
2649 spin_lock_init(&mcount_spinlock);
2650 spin_lock_init(&intr_spinlock);
2651 spin_lock_init(&mpintr_spinlock);
2652 spin_lock_init(&imen_spinlock);
2653 spin_lock_init(&smp_rv_spinlock);
2654 spin_lock_init(&com_spinlock);
2655 spin_lock_init(&clock_spinlock);
2657 /* our token pool needs to work early */
2658 lwkt_token_pool_init();