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"
56 #include <sys/param.h>
57 #include <sys/systm.h>
58 #include <sys/sysproto.h>
59 #include <sys/signalvar.h>
60 #include <sys/kernel.h>
61 #include <sys/linker.h>
62 #include <sys/malloc.h>
66 #include <sys/reboot.h>
68 #include <sys/msgbuf.h>
69 #include <sys/sysent.h>
70 #include <sys/sysctl.h>
71 #include <sys/vmmeter.h>
73 #include <sys/upcall.h>
74 #include <sys/usched.h>
78 #include <vm/vm_param.h>
80 #include <vm/vm_kern.h>
81 #include <vm/vm_object.h>
82 #include <vm/vm_page.h>
83 #include <vm/vm_map.h>
84 #include <vm/vm_pager.h>
85 #include <vm/vm_extern.h>
87 #include <sys/thread2.h>
88 #include <sys/mplock2.h>
96 #include <machine/cpu.h>
97 #include <machine/clock.h>
98 #include <machine/specialreg.h>
99 #include <machine/bootinfo.h>
100 #include <machine/md_var.h>
101 #include <machine/pcb_ext.h> /* pcb.h included via sys/user.h */
102 #include <machine/globaldata.h> /* CPU_prvspace */
103 #include <machine/smp.h>
105 #include <machine/perfmon.h>
107 #include <machine/cputypes.h>
108 #include <machine/intr_machdep.h>
111 #include <bus/isa/isa_device.h>
113 #include <machine_base/isa/isa_intr.h>
114 #include <bus/isa/rtc.h>
115 #include <machine/vm86.h>
116 #include <sys/random.h>
117 #include <sys/ptrace.h>
118 #include <machine/sigframe.h>
120 #include <sys/machintr.h>
121 #include <machine_base/icu/icu_abi.h>
122 #include <machine_base/icu/elcr_var.h>
123 #include <machine_base/apic/lapic.h>
124 #include <machine_base/apic/ioapic.h>
125 #include <machine_base/apic/ioapic_abi.h>
126 #include <machine/mptable.h>
128 #define PHYSMAP_ENTRIES 10
130 extern void init386(int first);
131 extern void dblfault_handler(void);
133 extern void printcpuinfo(void); /* XXX header file */
134 extern void finishidentcpu(void);
135 extern void panicifcpuunsupported(void);
136 extern void initializecpu(void);
138 static void cpu_startup(void *);
139 static void pic_finish(void *);
140 static void cpu_finish(void *);
141 #ifndef CPU_DISABLE_SSE
142 static void set_fpregs_xmm(struct save87 *, struct savexmm *);
143 static void fill_fpregs_xmm(struct savexmm *, struct save87 *);
144 #endif /* CPU_DISABLE_SSE */
146 extern void ffs_rawread_setup(void);
147 #endif /* DIRECTIO */
148 static void init_locks(void);
150 SYSINIT(cpu, SI_BOOT2_START_CPU, SI_ORDER_FIRST, cpu_startup, NULL)
151 SYSINIT(pic_finish, SI_BOOT2_FINISH_PIC, SI_ORDER_FIRST, pic_finish, NULL)
152 SYSINIT(cpu_finish, SI_BOOT2_FINISH_CPU, SI_ORDER_FIRST, cpu_finish, NULL)
154 int _udatasel, _ucodesel;
157 int64_t tsc_offsets[MAXCPU];
159 int64_t tsc_offsets[1];
162 #if defined(SWTCH_OPTIM_STATS)
163 extern int swtch_optim_stats;
164 SYSCTL_INT(_debug, OID_AUTO, swtch_optim_stats,
165 CTLFLAG_RD, &swtch_optim_stats, 0, "");
166 SYSCTL_INT(_debug, OID_AUTO, tlb_flush_count,
167 CTLFLAG_RD, &tlb_flush_count, 0, "");
172 u_long ebda_addr = 0;
174 int imcr_present = 0;
176 int naps = 0; /* # of Applications processors */
181 sysctl_hw_physmem(SYSCTL_HANDLER_ARGS)
183 u_long pmem = ctob(physmem);
185 int error = sysctl_handle_long(oidp, &pmem, 0, req);
189 SYSCTL_PROC(_hw, HW_PHYSMEM, physmem, CTLTYPE_ULONG|CTLFLAG_RD,
190 0, 0, sysctl_hw_physmem, "LU", "Total system memory in bytes (number of pages * page size)");
193 sysctl_hw_usermem(SYSCTL_HANDLER_ARGS)
195 int error = sysctl_handle_int(oidp, 0,
196 ctob(physmem - vmstats.v_wire_count), req);
200 SYSCTL_PROC(_hw, HW_USERMEM, usermem, CTLTYPE_INT|CTLFLAG_RD,
201 0, 0, sysctl_hw_usermem, "IU", "");
204 sysctl_hw_availpages(SYSCTL_HANDLER_ARGS)
206 int error = sysctl_handle_int(oidp, 0,
207 i386_btop(avail_end - avail_start), req);
211 SYSCTL_PROC(_hw, OID_AUTO, availpages, CTLTYPE_INT|CTLFLAG_RD,
212 0, 0, sysctl_hw_availpages, "I", "");
217 vm_paddr_t phys_avail[PHYSMAP_ENTRIES*2+2];
218 vm_paddr_t dump_avail[PHYSMAP_ENTRIES*2+2];
221 static vm_offset_t buffer_sva, buffer_eva;
222 vm_offset_t clean_sva, clean_eva;
223 static vm_offset_t pager_sva, pager_eva;
224 static struct trapframe proc0_tf;
227 cpu_startup(void *dummy)
231 vm_offset_t firstaddr;
234 * Good {morning,afternoon,evening,night}.
236 kprintf("%s", version);
239 panicifcpuunsupported();
243 kprintf("real memory = %ju (%ju MB)\n",
245 (intmax_t)Realmem / 1024 / 1024);
247 * Display any holes after the first chunk of extended memory.
252 kprintf("Physical memory chunk(s):\n");
253 for (indx = 0; phys_avail[indx + 1] != 0; indx += 2) {
254 vm_paddr_t size1 = phys_avail[indx + 1] - phys_avail[indx];
256 kprintf("0x%08llx - 0x%08llx, %llu bytes (%llu pages)\n",
257 phys_avail[indx], phys_avail[indx + 1] - 1, size1,
263 * Allocate space for system data structures.
264 * The first available kernel virtual address is in "v".
265 * As pages of kernel virtual memory are allocated, "v" is incremented.
266 * As pages of memory are allocated and cleared,
267 * "firstaddr" is incremented.
268 * An index into the kernel page table corresponding to the
269 * virtual memory address maintained in "v" is kept in "mapaddr".
273 * Make two passes. The first pass calculates how much memory is
274 * needed and allocates it. The second pass assigns virtual
275 * addresses to the various data structures.
279 v = (caddr_t)firstaddr;
281 #define valloc(name, type, num) \
282 (name) = (type *)v; v = (caddr_t)((name)+(num))
283 #define valloclim(name, type, num, lim) \
284 (name) = (type *)v; v = (caddr_t)((lim) = ((name)+(num)))
287 * The nominal buffer size (and minimum KVA allocation) is BKVASIZE.
288 * For the first 64MB of ram nominally allocate sufficient buffers to
289 * cover 1/4 of our ram. Beyond the first 64MB allocate additional
290 * buffers to cover 1/20 of our ram over 64MB. When auto-sizing
291 * the buffer cache we limit the eventual kva reservation to
294 * factor represents the 1/4 x ram conversion.
297 int factor = 4 * BKVASIZE / 1024;
298 int kbytes = physmem * (PAGE_SIZE / 1024);
302 nbuf += min((kbytes - 4096) / factor, 65536 / factor);
304 nbuf += (kbytes - 65536) * 2 / (factor * 5);
305 if (maxbcache && nbuf > maxbcache / BKVASIZE)
306 nbuf = maxbcache / BKVASIZE;
310 * Do not allow the buffer_map to be more then 1/2 the size of the
313 if (nbuf > (virtual_end - virtual_start) / (BKVASIZE * 2)) {
314 nbuf = (virtual_end - virtual_start) / (BKVASIZE * 2);
315 kprintf("Warning: nbufs capped at %d\n", nbuf);
318 /* limit to 128 on i386 */
319 nswbuf = max(min(nbuf/4, 128), 16);
321 if (nswbuf < NSWBUF_MIN)
328 valloc(swbuf, struct buf, nswbuf);
329 valloc(buf, struct buf, nbuf);
332 * End of first pass, size has been calculated so allocate memory
334 if (firstaddr == 0) {
335 size = (vm_size_t)(v - firstaddr);
336 firstaddr = kmem_alloc(&kernel_map, round_page(size));
338 panic("startup: no room for tables");
343 * End of second pass, addresses have been assigned
345 if ((vm_size_t)(v - firstaddr) != size)
346 panic("startup: table size inconsistency");
348 kmem_suballoc(&kernel_map, &clean_map, &clean_sva, &clean_eva,
349 (nbuf*BKVASIZE) + (nswbuf*MAXPHYS) + pager_map_size);
350 kmem_suballoc(&clean_map, &buffer_map, &buffer_sva, &buffer_eva,
352 buffer_map.system_map = 1;
353 kmem_suballoc(&clean_map, &pager_map, &pager_sva, &pager_eva,
354 (nswbuf*MAXPHYS) + pager_map_size);
355 pager_map.system_map = 1;
357 #if defined(USERCONFIG)
359 cninit(); /* the preferred console may have changed */
362 kprintf("avail memory = %ju (%ju MB)\n",
363 (intmax_t)ptoa(vmstats.v_free_count),
364 (intmax_t)ptoa(vmstats.v_free_count) / 1024 / 1024);
367 * Set up buffers, so they can be used to read disk labels.
370 vm_pager_bufferinit();
374 cpu_finish(void *dummy __unused)
380 pic_finish(void *dummy __unused)
382 /* Log ELCR information */
385 /* Log MPTABLE information */
386 mptable_pci_int_dump();
389 MachIntrABI.finalize();
393 * Send an interrupt to process.
395 * Stack is set up to allow sigcode stored
396 * at top to call routine, followed by kcall
397 * to sigreturn routine below. After sigreturn
398 * resets the signal mask, the stack, and the
399 * frame pointer, it returns to the user
403 sendsig(sig_t catcher, int sig, sigset_t *mask, u_long code)
405 struct lwp *lp = curthread->td_lwp;
406 struct proc *p = lp->lwp_proc;
407 struct trapframe *regs;
408 struct sigacts *psp = p->p_sigacts;
409 struct sigframe sf, *sfp;
412 regs = lp->lwp_md.md_regs;
413 oonstack = (lp->lwp_sigstk.ss_flags & SS_ONSTACK) ? 1 : 0;
415 /* save user context */
416 bzero(&sf, sizeof(struct sigframe));
417 sf.sf_uc.uc_sigmask = *mask;
418 sf.sf_uc.uc_stack = lp->lwp_sigstk;
419 sf.sf_uc.uc_mcontext.mc_onstack = oonstack;
420 bcopy(regs, &sf.sf_uc.uc_mcontext.mc_gs, sizeof(struct trapframe));
422 /* make the size of the saved context visible to userland */
423 sf.sf_uc.uc_mcontext.mc_len = sizeof(sf.sf_uc.uc_mcontext);
425 /* save mailbox pending state for syscall interlock semantics */
426 if (p->p_flag & P_MAILBOX)
427 sf.sf_uc.uc_mcontext.mc_xflags |= PGEX_MAILBOX;
429 /* Allocate and validate space for the signal handler context. */
430 if ((lp->lwp_flag & LWP_ALTSTACK) != 0 && !oonstack &&
431 SIGISMEMBER(psp->ps_sigonstack, sig)) {
432 sfp = (struct sigframe *)(lp->lwp_sigstk.ss_sp +
433 lp->lwp_sigstk.ss_size - sizeof(struct sigframe));
434 lp->lwp_sigstk.ss_flags |= SS_ONSTACK;
436 sfp = (struct sigframe *)regs->tf_esp - 1;
439 /* Translate the signal is appropriate */
440 if (p->p_sysent->sv_sigtbl) {
441 if (sig <= p->p_sysent->sv_sigsize)
442 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)];
445 /* Build the argument list for the signal handler. */
447 sf.sf_ucontext = (register_t)&sfp->sf_uc;
448 if (SIGISMEMBER(psp->ps_siginfo, sig)) {
449 /* Signal handler installed with SA_SIGINFO. */
450 sf.sf_siginfo = (register_t)&sfp->sf_si;
451 sf.sf_ahu.sf_action = (__siginfohandler_t *)catcher;
453 /* fill siginfo structure */
454 sf.sf_si.si_signo = sig;
455 sf.sf_si.si_code = code;
456 sf.sf_si.si_addr = (void*)regs->tf_err;
459 /* Old FreeBSD-style arguments. */
460 sf.sf_siginfo = code;
461 sf.sf_addr = regs->tf_err;
462 sf.sf_ahu.sf_handler = catcher;
466 * If we're a vm86 process, we want to save the segment registers.
467 * We also change eflags to be our emulated eflags, not the actual
470 if (regs->tf_eflags & PSL_VM) {
471 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs;
472 struct vm86_kernel *vm86 = &lp->lwp_thread->td_pcb->pcb_ext->ext_vm86;
474 sf.sf_uc.uc_mcontext.mc_gs = tf->tf_vm86_gs;
475 sf.sf_uc.uc_mcontext.mc_fs = tf->tf_vm86_fs;
476 sf.sf_uc.uc_mcontext.mc_es = tf->tf_vm86_es;
477 sf.sf_uc.uc_mcontext.mc_ds = tf->tf_vm86_ds;
479 if (vm86->vm86_has_vme == 0)
480 sf.sf_uc.uc_mcontext.mc_eflags =
481 (tf->tf_eflags & ~(PSL_VIF | PSL_VIP)) |
482 (vm86->vm86_eflags & (PSL_VIF | PSL_VIP));
485 * Clear PSL_NT to inhibit T_TSSFLT faults on return from
486 * syscalls made by the signal handler. This just avoids
487 * wasting time for our lazy fixup of such faults. PSL_NT
488 * does nothing in vm86 mode, but vm86 programs can set it
489 * almost legitimately in probes for old cpu types.
491 tf->tf_eflags &= ~(PSL_VM | PSL_NT | PSL_VIF | PSL_VIP);
495 * Save the FPU state and reinit the FP unit
497 npxpush(&sf.sf_uc.uc_mcontext);
500 * Copy the sigframe out to the user's stack.
502 if (copyout(&sf, sfp, sizeof(struct sigframe)) != 0) {
504 * Something is wrong with the stack pointer.
505 * ...Kill the process.
510 regs->tf_esp = (int)sfp;
511 regs->tf_eip = PS_STRINGS - *(p->p_sysent->sv_szsigcode);
514 * i386 abi specifies that the direction flag must be cleared
517 regs->tf_eflags &= ~(PSL_T|PSL_D);
519 regs->tf_cs = _ucodesel;
520 regs->tf_ds = _udatasel;
521 regs->tf_es = _udatasel;
524 * Allow the signal handler to inherit %fs in addition to %gs as
525 * the userland program might be using both.
527 * However, if a T_PROTFLT occured the segment registers could be
528 * totally broken. They must be reset in order to be able to
529 * return to userland.
531 if (regs->tf_trapno == T_PROTFLT) {
532 regs->tf_fs = _udatasel;
533 regs->tf_gs = _udatasel;
535 regs->tf_ss = _udatasel;
539 * Sanitize the trapframe for a virtual kernel passing control to a custom
540 * VM context. Remove any items that would otherwise create a privilage
543 * XXX at the moment we allow userland to set the resume flag. Is this a
547 cpu_sanitize_frame(struct trapframe *frame)
549 frame->tf_cs = _ucodesel;
550 frame->tf_ds = _udatasel;
551 frame->tf_es = _udatasel; /* XXX allow userland this one too? */
553 frame->tf_fs = _udatasel;
554 frame->tf_gs = _udatasel;
556 frame->tf_ss = _udatasel;
557 frame->tf_eflags &= (PSL_RF | PSL_USERCHANGE);
558 frame->tf_eflags |= PSL_RESERVED_DEFAULT | PSL_I;
563 cpu_sanitize_tls(struct savetls *tls)
565 struct segment_descriptor *desc;
568 for (i = 0; i < NGTLS; ++i) {
570 if (desc->sd_dpl == 0 && desc->sd_type == 0)
572 if (desc->sd_def32 == 0)
574 if (desc->sd_type != SDT_MEMRWA)
576 if (desc->sd_dpl != SEL_UPL)
578 if (desc->sd_xx != 0 || desc->sd_p != 1)
585 * sigreturn(ucontext_t *sigcntxp)
587 * System call to cleanup state after a signal
588 * has been taken. Reset signal mask and
589 * stack state from context left by sendsig (above).
590 * Return to previous pc and psl as specified by
591 * context left by sendsig. Check carefully to
592 * make sure that the user has not modified the
593 * state to gain improper privileges.
597 #define EFL_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0)
598 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL)
601 sys_sigreturn(struct sigreturn_args *uap)
603 struct lwp *lp = curthread->td_lwp;
604 struct proc *p = lp->lwp_proc;
605 struct trapframe *regs;
613 * We have to copy the information into kernel space so userland
614 * can't modify it while we are sniffing it.
616 regs = lp->lwp_md.md_regs;
617 error = copyin(uap->sigcntxp, &uc, sizeof(uc));
621 eflags = ucp->uc_mcontext.mc_eflags;
623 if (eflags & PSL_VM) {
624 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs;
625 struct vm86_kernel *vm86;
628 * if pcb_ext == 0 or vm86_inited == 0, the user hasn't
629 * set up the vm86 area, and we can't enter vm86 mode.
631 if (lp->lwp_thread->td_pcb->pcb_ext == 0)
633 vm86 = &lp->lwp_thread->td_pcb->pcb_ext->ext_vm86;
634 if (vm86->vm86_inited == 0)
637 /* go back to user mode if both flags are set */
638 if ((eflags & PSL_VIP) && (eflags & PSL_VIF))
639 trapsignal(lp, SIGBUS, 0);
641 if (vm86->vm86_has_vme) {
642 eflags = (tf->tf_eflags & ~VME_USERCHANGE) |
643 (eflags & VME_USERCHANGE) | PSL_VM;
645 vm86->vm86_eflags = eflags; /* save VIF, VIP */
646 eflags = (tf->tf_eflags & ~VM_USERCHANGE) |
647 (eflags & VM_USERCHANGE) | PSL_VM;
649 bcopy(&ucp->uc_mcontext.mc_gs, tf, sizeof(struct trapframe));
650 tf->tf_eflags = eflags;
651 tf->tf_vm86_ds = tf->tf_ds;
652 tf->tf_vm86_es = tf->tf_es;
653 tf->tf_vm86_fs = tf->tf_fs;
654 tf->tf_vm86_gs = tf->tf_gs;
655 tf->tf_ds = _udatasel;
656 tf->tf_es = _udatasel;
658 tf->tf_fs = _udatasel;
659 tf->tf_gs = _udatasel;
663 * Don't allow users to change privileged or reserved flags.
666 * XXX do allow users to change the privileged flag PSL_RF.
667 * The cpu sets PSL_RF in tf_eflags for faults. Debuggers
668 * should sometimes set it there too. tf_eflags is kept in
669 * the signal context during signal handling and there is no
670 * other place to remember it, so the PSL_RF bit may be
671 * corrupted by the signal handler without us knowing.
672 * Corruption of the PSL_RF bit at worst causes one more or
673 * one less debugger trap, so allowing it is fairly harmless.
675 if (!EFL_SECURE(eflags & ~PSL_RF, regs->tf_eflags & ~PSL_RF)) {
676 kprintf("sigreturn: eflags = 0x%x\n", eflags);
681 * Don't allow users to load a valid privileged %cs. Let the
682 * hardware check for invalid selectors, excess privilege in
683 * other selectors, invalid %eip's and invalid %esp's.
685 cs = ucp->uc_mcontext.mc_cs;
686 if (!CS_SECURE(cs)) {
687 kprintf("sigreturn: cs = 0x%x\n", cs);
688 trapsignal(lp, SIGBUS, T_PROTFLT);
691 bcopy(&ucp->uc_mcontext.mc_gs, regs, sizeof(struct trapframe));
695 * Restore the FPU state from the frame
698 npxpop(&ucp->uc_mcontext);
701 * Merge saved signal mailbox pending flag to maintain interlock
702 * semantics against system calls.
704 if (ucp->uc_mcontext.mc_xflags & PGEX_MAILBOX)
705 p->p_flag |= P_MAILBOX;
707 if (ucp->uc_mcontext.mc_onstack & 1)
708 lp->lwp_sigstk.ss_flags |= SS_ONSTACK;
710 lp->lwp_sigstk.ss_flags &= ~SS_ONSTACK;
712 lp->lwp_sigmask = ucp->uc_sigmask;
713 SIG_CANTMASK(lp->lwp_sigmask);
719 * Stack frame on entry to function. %eax will contain the function vector,
720 * %ecx will contain the function data. flags, ecx, and eax will have
721 * already been pushed on the stack.
732 sendupcall(struct vmupcall *vu, int morepending)
734 struct lwp *lp = curthread->td_lwp;
735 struct trapframe *regs;
736 struct upcall upcall;
737 struct upc_frame upc_frame;
741 * If we are a virtual kernel running an emulated user process
742 * context, switch back to the virtual kernel context before
743 * trying to post the signal.
745 if (lp->lwp_vkernel && lp->lwp_vkernel->ve) {
746 lp->lwp_md.md_regs->tf_trapno = 0;
747 vkernel_trap(lp, lp->lwp_md.md_regs);
751 * Get the upcall data structure
753 if (copyin(lp->lwp_upcall, &upcall, sizeof(upcall)) ||
754 copyin((char *)upcall.upc_uthread + upcall.upc_critoff, &crit_count, sizeof(int))
757 kprintf("bad upcall address\n");
762 * If the data structure is already marked pending or has a critical
763 * section count, mark the data structure as pending and return
764 * without doing an upcall. vu_pending is left set.
766 if (upcall.upc_pending || crit_count >= vu->vu_pending) {
767 if (upcall.upc_pending < vu->vu_pending) {
768 upcall.upc_pending = vu->vu_pending;
769 copyout(&upcall.upc_pending, &lp->lwp_upcall->upc_pending,
770 sizeof(upcall.upc_pending));
776 * We can run this upcall now, clear vu_pending.
778 * Bump our critical section count and set or clear the
779 * user pending flag depending on whether more upcalls are
780 * pending. The user will be responsible for calling
781 * upc_dispatch(-1) to process remaining upcalls.
784 upcall.upc_pending = morepending;
786 copyout(&upcall.upc_pending, &lp->lwp_upcall->upc_pending,
787 sizeof(upcall.upc_pending));
788 copyout(&crit_count, (char *)upcall.upc_uthread + upcall.upc_critoff,
792 * Construct a stack frame and issue the upcall
794 regs = lp->lwp_md.md_regs;
795 upc_frame.eax = regs->tf_eax;
796 upc_frame.ecx = regs->tf_ecx;
797 upc_frame.edx = regs->tf_edx;
798 upc_frame.flags = regs->tf_eflags;
799 upc_frame.oldip = regs->tf_eip;
800 if (copyout(&upc_frame, (void *)(regs->tf_esp - sizeof(upc_frame)),
801 sizeof(upc_frame)) != 0) {
802 kprintf("bad stack on upcall\n");
804 regs->tf_eax = (register_t)vu->vu_func;
805 regs->tf_ecx = (register_t)vu->vu_data;
806 regs->tf_edx = (register_t)lp->lwp_upcall;
807 regs->tf_eip = (register_t)vu->vu_ctx;
808 regs->tf_esp -= sizeof(upc_frame);
813 * fetchupcall occurs in the context of a system call, which means that
814 * we have to return EJUSTRETURN in order to prevent eax and edx from
815 * being overwritten by the syscall return value.
817 * if vu is not NULL we return the new context in %edx, the new data in %ecx,
818 * and the function pointer in %eax.
821 fetchupcall(struct vmupcall *vu, int morepending, void *rsp)
823 struct upc_frame upc_frame;
824 struct lwp *lp = curthread->td_lwp;
825 struct trapframe *regs;
827 struct upcall upcall;
830 regs = lp->lwp_md.md_regs;
832 error = copyout(&morepending, &lp->lwp_upcall->upc_pending, sizeof(int));
836 * This jumps us to the next ready context.
839 error = copyin(lp->lwp_upcall, &upcall, sizeof(upcall));
842 error = copyin((char *)upcall.upc_uthread + upcall.upc_critoff, &crit_count, sizeof(int));
845 error = copyout(&crit_count, (char *)upcall.upc_uthread + upcall.upc_critoff, sizeof(int));
846 regs->tf_eax = (register_t)vu->vu_func;
847 regs->tf_ecx = (register_t)vu->vu_data;
848 regs->tf_edx = (register_t)lp->lwp_upcall;
849 regs->tf_eip = (register_t)vu->vu_ctx;
850 regs->tf_esp = (register_t)rsp;
853 * This returns us to the originally interrupted code.
855 error = copyin(rsp, &upc_frame, sizeof(upc_frame));
856 regs->tf_eax = upc_frame.eax;
857 regs->tf_ecx = upc_frame.ecx;
858 regs->tf_edx = upc_frame.edx;
859 regs->tf_eflags = (regs->tf_eflags & ~PSL_USERCHANGE) |
860 (upc_frame.flags & PSL_USERCHANGE);
861 regs->tf_eip = upc_frame.oldip;
862 regs->tf_esp = (register_t)((char *)rsp + sizeof(upc_frame));
871 * Machine dependent boot() routine
873 * I haven't seen anything to put here yet
874 * Possibly some stuff might be grafted back here from boot()
882 * Shutdown the CPU as much as possible
888 __asm__ __volatile("hlt");
892 * cpu_idle() represents the idle LWKT. You cannot return from this function
893 * (unless you want to blow things up!). Instead we look for runnable threads
894 * and loop or halt as appropriate. Giant is not held on entry to the thread.
896 * The main loop is entered with a critical section held, we must release
897 * the critical section before doing anything else. lwkt_switch() will
898 * check for pending interrupts due to entering and exiting its own
901 * NOTE: On an SMP system we rely on a scheduler IPI to wake a HLTed cpu up.
902 * However, there are cases where the idlethread will be entered with
903 * the possibility that no IPI will occur and in such cases
904 * lwkt_switch() sets RQF_WAKEUP. We usually check
905 * RQF_IDLECHECK_WK_MASK.
907 * NOTE: cpu_idle_hlt again defaults to 2 (use ACPI sleep states). Set to
908 * 1 to just use hlt and for debugging purposes.
910 static int cpu_idle_hlt = 2;
911 static int cpu_idle_hltcnt;
912 static int cpu_idle_spincnt;
913 static u_int cpu_idle_repeat = 4;
914 SYSCTL_INT(_machdep, OID_AUTO, cpu_idle_hlt, CTLFLAG_RW,
915 &cpu_idle_hlt, 0, "Idle loop HLT enable");
916 SYSCTL_INT(_machdep, OID_AUTO, cpu_idle_hltcnt, CTLFLAG_RW,
917 &cpu_idle_hltcnt, 0, "Idle loop entry halts");
918 SYSCTL_INT(_machdep, OID_AUTO, cpu_idle_spincnt, CTLFLAG_RW,
919 &cpu_idle_spincnt, 0, "Idle loop entry spins");
920 SYSCTL_INT(_machdep, OID_AUTO, cpu_idle_repeat, CTLFLAG_RW,
921 &cpu_idle_repeat, 0, "Idle entries before acpi hlt");
924 cpu_idle_default_hook(void)
927 * We must guarentee that hlt is exactly the instruction
930 __asm __volatile("sti; hlt");
933 /* Other subsystems (e.g., ACPI) can hook this later. */
934 void (*cpu_idle_hook)(void) = cpu_idle_default_hook;
939 globaldata_t gd = mycpu;
940 struct thread *td __debugvar = gd->gd_curthread;
945 KKASSERT(td->td_critcount == 0);
948 * See if there are any LWKTs ready to go.
953 * When halting inside a cli we must check for reqflags
954 * races, particularly [re]schedule requests. Running
955 * splz() does the job.
958 * 0 Never halt, just spin
960 * 1 Always use HLT (or MONITOR/MWAIT if avail).
961 * This typically eats more power than the
964 * 2 Use HLT/MONITOR/MWAIT up to a point and then
965 * use the ACPI halt (default). This is a hybrid
966 * approach. See machdep.cpu_idle_repeat.
968 * 3 Always use the ACPI halt. This typically
969 * eats the least amount of power but the cpu
970 * will be slow waking up. Slows down e.g.
971 * compiles and other pipe/event oriented stuff.
974 * NOTE: Interrupts are enabled and we are not in a critical
977 * NOTE: Preemptions do not reset gd_idle_repeat. Also we
978 * don't bother capping gd_idle_repeat, it is ok if
981 ++gd->gd_idle_repeat;
982 reqflags = gd->gd_reqflags;
983 quick = (cpu_idle_hlt == 1) ||
985 gd->gd_idle_repeat < cpu_idle_repeat);
987 if (quick && (cpu_mi_feature & CPU_MI_MONITOR) &&
988 (reqflags & RQF_IDLECHECK_WK_MASK) == 0) {
989 cpu_mmw_pause_int(&gd->gd_reqflags, reqflags);
991 } else if (cpu_idle_hlt) {
992 __asm __volatile("cli");
994 if ((gd->gd_reqflags & RQF_IDLECHECK_WK_MASK) == 0) {
996 cpu_idle_default_hook();
1000 __asm __volatile("sti");
1004 __asm __volatile("sti");
1013 * This routine is called if a spinlock has been held through the
1014 * exponential backoff period and is seriously contested. On a real cpu
1018 cpu_spinlock_contested(void)
1026 * Clear registers on exec
1029 exec_setregs(u_long entry, u_long stack, u_long ps_strings)
1031 struct thread *td = curthread;
1032 struct lwp *lp = td->td_lwp;
1033 struct pcb *pcb = td->td_pcb;
1034 struct trapframe *regs = lp->lwp_md.md_regs;
1036 /* was i386_user_cleanup() in NetBSD */
1039 bzero((char *)regs, sizeof(struct trapframe));
1040 regs->tf_eip = entry;
1041 regs->tf_esp = stack;
1042 regs->tf_eflags = PSL_USER | (regs->tf_eflags & PSL_T);
1043 regs->tf_ss = _udatasel;
1044 regs->tf_ds = _udatasel;
1045 regs->tf_es = _udatasel;
1046 regs->tf_fs = _udatasel;
1047 regs->tf_gs = _udatasel;
1048 regs->tf_cs = _ucodesel;
1050 /* PS_STRINGS value for BSD/OS binaries. It is 0 for non-BSD/OS. */
1051 regs->tf_ebx = ps_strings;
1054 * Reset the hardware debug registers if they were in use.
1055 * They won't have any meaning for the newly exec'd process.
1057 if (pcb->pcb_flags & PCB_DBREGS) {
1064 if (pcb == td->td_pcb) {
1066 * Clear the debug registers on the running
1067 * CPU, otherwise they will end up affecting
1068 * the next process we switch to.
1072 pcb->pcb_flags &= ~PCB_DBREGS;
1076 * Initialize the math emulator (if any) for the current process.
1077 * Actually, just clear the bit that says that the emulator has
1078 * been initialized. Initialization is delayed until the process
1079 * traps to the emulator (if it is done at all) mainly because
1080 * emulators don't provide an entry point for initialization.
1082 pcb->pcb_flags &= ~FP_SOFTFP;
1085 * note: do not set CR0_TS here. npxinit() must do it after clearing
1086 * gd_npxthread. Otherwise a preemptive interrupt thread may panic
1090 load_cr0(rcr0() | CR0_MP);
1093 /* Initialize the npx (if any) for the current process. */
1094 npxinit(__INITIAL_NPXCW__);
1099 * note: linux emulator needs edx to be 0x0 on entry, which is
1100 * handled in execve simply by setting the 64 bit syscall
1101 * return value to 0.
1111 cr0 |= CR0_NE; /* Done by npxinit() */
1112 cr0 |= CR0_MP | CR0_TS; /* Done at every execve() too. */
1113 cr0 |= CR0_WP | CR0_AM;
1119 sysctl_machdep_adjkerntz(SYSCTL_HANDLER_ARGS)
1122 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2,
1124 if (!error && req->newptr)
1129 SYSCTL_PROC(_machdep, CPU_ADJKERNTZ, adjkerntz, CTLTYPE_INT|CTLFLAG_RW,
1130 &adjkerntz, 0, sysctl_machdep_adjkerntz, "I", "");
1132 SYSCTL_INT(_machdep, CPU_DISRTCSET, disable_rtc_set,
1133 CTLFLAG_RW, &disable_rtc_set, 0, "");
1135 SYSCTL_STRUCT(_machdep, CPU_BOOTINFO, bootinfo,
1136 CTLFLAG_RD, &bootinfo, bootinfo, "");
1138 SYSCTL_INT(_machdep, CPU_WALLCLOCK, wall_cmos_clock,
1139 CTLFLAG_RW, &wall_cmos_clock, 0, "");
1141 extern u_long bootdev; /* not a cdev_t - encoding is different */
1142 SYSCTL_ULONG(_machdep, OID_AUTO, guessed_bootdev,
1143 CTLFLAG_RD, &bootdev, 0, "Boot device (not in cdev_t format)");
1146 * Initialize 386 and configure to run kernel
1150 * Initialize segments & interrupt table
1154 union descriptor gdt[NGDT * MAXCPU]; /* global descriptor table */
1155 static struct gate_descriptor idt0[NIDT];
1156 struct gate_descriptor *idt = &idt0[0]; /* interrupt descriptor table */
1157 union descriptor ldt[NLDT]; /* local descriptor table */
1159 /* table descriptors - used to load tables by cpu */
1160 struct region_descriptor r_gdt, r_idt;
1162 #if defined(I586_CPU) && !defined(NO_F00F_HACK)
1163 extern int has_f00f_bug;
1166 static struct i386tss dblfault_tss;
1167 static char dblfault_stack[PAGE_SIZE];
1169 extern struct user *proc0paddr;
1172 /* software prototypes -- in more palatable form */
1173 struct soft_segment_descriptor gdt_segs[] = {
1174 /* GNULL_SEL 0 Null Descriptor */
1175 { 0x0, /* segment base address */
1177 0, /* segment type */
1178 0, /* segment descriptor priority level */
1179 0, /* segment descriptor present */
1181 0, /* default 32 vs 16 bit size */
1182 0 /* limit granularity (byte/page units)*/ },
1183 /* GCODE_SEL 1 Code Descriptor for kernel */
1184 { 0x0, /* segment base address */
1185 0xfffff, /* length - all address space */
1186 SDT_MEMERA, /* segment type */
1187 0, /* segment descriptor priority level */
1188 1, /* segment descriptor present */
1190 1, /* default 32 vs 16 bit size */
1191 1 /* limit granularity (byte/page units)*/ },
1192 /* GDATA_SEL 2 Data Descriptor for kernel */
1193 { 0x0, /* segment base address */
1194 0xfffff, /* length - all address space */
1195 SDT_MEMRWA, /* segment type */
1196 0, /* segment descriptor priority level */
1197 1, /* segment descriptor present */
1199 1, /* default 32 vs 16 bit size */
1200 1 /* limit granularity (byte/page units)*/ },
1201 /* GPRIV_SEL 3 SMP Per-Processor Private Data Descriptor */
1202 { 0x0, /* segment base address */
1203 0xfffff, /* length - all address space */
1204 SDT_MEMRWA, /* segment type */
1205 0, /* segment descriptor priority level */
1206 1, /* segment descriptor present */
1208 1, /* default 32 vs 16 bit size */
1209 1 /* limit granularity (byte/page units)*/ },
1210 /* GPROC0_SEL 4 Proc 0 Tss Descriptor */
1212 0x0, /* segment base address */
1213 sizeof(struct i386tss)-1,/* length - all address space */
1214 SDT_SYS386TSS, /* segment type */
1215 0, /* segment descriptor priority level */
1216 1, /* segment descriptor present */
1218 0, /* unused - default 32 vs 16 bit size */
1219 0 /* limit granularity (byte/page units)*/ },
1220 /* GLDT_SEL 5 LDT Descriptor */
1221 { (int) ldt, /* segment base address */
1222 sizeof(ldt)-1, /* length - all address space */
1223 SDT_SYSLDT, /* segment type */
1224 SEL_UPL, /* segment descriptor priority level */
1225 1, /* segment descriptor present */
1227 0, /* unused - default 32 vs 16 bit size */
1228 0 /* limit granularity (byte/page units)*/ },
1229 /* GUSERLDT_SEL 6 User LDT Descriptor per process */
1230 { (int) ldt, /* segment base address */
1231 (512 * sizeof(union descriptor)-1), /* length */
1232 SDT_SYSLDT, /* segment type */
1233 0, /* segment descriptor priority level */
1234 1, /* segment descriptor present */
1236 0, /* unused - default 32 vs 16 bit size */
1237 0 /* limit granularity (byte/page units)*/ },
1238 /* GTGATE_SEL 7 Null Descriptor - Placeholder */
1239 { 0x0, /* segment base address */
1240 0x0, /* length - all address space */
1241 0, /* segment type */
1242 0, /* segment descriptor priority level */
1243 0, /* segment descriptor present */
1245 0, /* default 32 vs 16 bit size */
1246 0 /* limit granularity (byte/page units)*/ },
1247 /* GBIOSLOWMEM_SEL 8 BIOS access to realmode segment 0x40, must be #8 in GDT */
1248 { 0x400, /* segment base address */
1249 0xfffff, /* length */
1250 SDT_MEMRWA, /* segment type */
1251 0, /* segment descriptor priority level */
1252 1, /* segment descriptor present */
1254 1, /* default 32 vs 16 bit size */
1255 1 /* limit granularity (byte/page units)*/ },
1256 /* GPANIC_SEL 9 Panic Tss Descriptor */
1257 { (int) &dblfault_tss, /* segment base address */
1258 sizeof(struct i386tss)-1,/* length - all address space */
1259 SDT_SYS386TSS, /* segment type */
1260 0, /* segment descriptor priority level */
1261 1, /* segment descriptor present */
1263 0, /* unused - default 32 vs 16 bit size */
1264 0 /* limit granularity (byte/page units)*/ },
1265 /* GBIOSCODE32_SEL 10 BIOS 32-bit interface (32bit Code) */
1266 { 0, /* segment base address (overwritten) */
1267 0xfffff, /* length */
1268 SDT_MEMERA, /* segment type */
1269 0, /* segment descriptor priority level */
1270 1, /* segment descriptor present */
1272 0, /* default 32 vs 16 bit size */
1273 1 /* limit granularity (byte/page units)*/ },
1274 /* GBIOSCODE16_SEL 11 BIOS 32-bit interface (16bit Code) */
1275 { 0, /* segment base address (overwritten) */
1276 0xfffff, /* length */
1277 SDT_MEMERA, /* segment type */
1278 0, /* segment descriptor priority level */
1279 1, /* segment descriptor present */
1281 0, /* default 32 vs 16 bit size */
1282 1 /* limit granularity (byte/page units)*/ },
1283 /* GBIOSDATA_SEL 12 BIOS 32-bit interface (Data) */
1284 { 0, /* segment base address (overwritten) */
1285 0xfffff, /* length */
1286 SDT_MEMRWA, /* segment type */
1287 0, /* segment descriptor priority level */
1288 1, /* segment descriptor present */
1290 1, /* default 32 vs 16 bit size */
1291 1 /* limit granularity (byte/page units)*/ },
1292 /* GBIOSUTIL_SEL 13 BIOS 16-bit interface (Utility) */
1293 { 0, /* segment base address (overwritten) */
1294 0xfffff, /* length */
1295 SDT_MEMRWA, /* segment type */
1296 0, /* segment descriptor priority level */
1297 1, /* segment descriptor present */
1299 0, /* default 32 vs 16 bit size */
1300 1 /* limit granularity (byte/page units)*/ },
1301 /* GBIOSARGS_SEL 14 BIOS 16-bit interface (Arguments) */
1302 { 0, /* segment base address (overwritten) */
1303 0xfffff, /* length */
1304 SDT_MEMRWA, /* segment type */
1305 0, /* segment descriptor priority level */
1306 1, /* segment descriptor present */
1308 0, /* default 32 vs 16 bit size */
1309 1 /* limit granularity (byte/page units)*/ },
1310 /* GTLS_START 15 TLS */
1311 { 0x0, /* segment base address */
1313 0, /* segment type */
1314 0, /* segment descriptor priority level */
1315 0, /* segment descriptor present */
1317 0, /* default 32 vs 16 bit size */
1318 0 /* limit granularity (byte/page units)*/ },
1319 /* GTLS_START+1 16 TLS */
1320 { 0x0, /* segment base address */
1322 0, /* segment type */
1323 0, /* segment descriptor priority level */
1324 0, /* segment descriptor present */
1326 0, /* default 32 vs 16 bit size */
1327 0 /* limit granularity (byte/page units)*/ },
1328 /* GTLS_END 17 TLS */
1329 { 0x0, /* segment base address */
1331 0, /* segment type */
1332 0, /* segment descriptor priority level */
1333 0, /* segment descriptor present */
1335 0, /* default 32 vs 16 bit size */
1336 0 /* limit granularity (byte/page units)*/ },
1339 static struct soft_segment_descriptor ldt_segs[] = {
1340 /* Null Descriptor - overwritten by call gate */
1341 { 0x0, /* segment base address */
1342 0x0, /* length - all address space */
1343 0, /* segment type */
1344 0, /* segment descriptor priority level */
1345 0, /* segment descriptor present */
1347 0, /* default 32 vs 16 bit size */
1348 0 /* limit granularity (byte/page units)*/ },
1349 /* Null Descriptor - overwritten by call gate */
1350 { 0x0, /* segment base address */
1351 0x0, /* length - all address space */
1352 0, /* segment type */
1353 0, /* segment descriptor priority level */
1354 0, /* segment descriptor present */
1356 0, /* default 32 vs 16 bit size */
1357 0 /* limit granularity (byte/page units)*/ },
1358 /* Null Descriptor - overwritten by call gate */
1359 { 0x0, /* segment base address */
1360 0x0, /* length - all address space */
1361 0, /* segment type */
1362 0, /* segment descriptor priority level */
1363 0, /* segment descriptor present */
1365 0, /* default 32 vs 16 bit size */
1366 0 /* limit granularity (byte/page units)*/ },
1367 /* Code Descriptor for user */
1368 { 0x0, /* segment base address */
1369 0xfffff, /* length - all address space */
1370 SDT_MEMERA, /* segment type */
1371 SEL_UPL, /* segment descriptor priority level */
1372 1, /* segment descriptor present */
1374 1, /* default 32 vs 16 bit size */
1375 1 /* limit granularity (byte/page units)*/ },
1376 /* Null Descriptor - overwritten by call gate */
1377 { 0x0, /* segment base address */
1378 0x0, /* length - all address space */
1379 0, /* segment type */
1380 0, /* segment descriptor priority level */
1381 0, /* segment descriptor present */
1383 0, /* default 32 vs 16 bit size */
1384 0 /* limit granularity (byte/page units)*/ },
1385 /* Data Descriptor for user */
1386 { 0x0, /* segment base address */
1387 0xfffff, /* length - all address space */
1388 SDT_MEMRWA, /* segment type */
1389 SEL_UPL, /* segment descriptor priority level */
1390 1, /* segment descriptor present */
1392 1, /* default 32 vs 16 bit size */
1393 1 /* limit granularity (byte/page units)*/ },
1397 setidt(int idx, inthand_t *func, int typ, int dpl, int selec)
1399 struct gate_descriptor *ip;
1402 ip->gd_looffset = (int)func;
1403 ip->gd_selector = selec;
1409 ip->gd_hioffset = ((int)func)>>16 ;
1412 #define IDTVEC(name) __CONCAT(X,name)
1415 IDTVEC(div), IDTVEC(dbg), IDTVEC(nmi), IDTVEC(bpt), IDTVEC(ofl),
1416 IDTVEC(bnd), IDTVEC(ill), IDTVEC(dna), IDTVEC(fpusegm),
1417 IDTVEC(tss), IDTVEC(missing), IDTVEC(stk), IDTVEC(prot),
1418 IDTVEC(page), IDTVEC(mchk), IDTVEC(fpu), IDTVEC(align),
1419 IDTVEC(xmm), IDTVEC(syscall),
1422 IDTVEC(int0x80_syscall);
1424 #ifdef DEBUG_INTERRUPTS
1425 extern inthand_t *Xrsvdary[256];
1429 sdtossd(struct segment_descriptor *sd, struct soft_segment_descriptor *ssd)
1431 ssd->ssd_base = (sd->sd_hibase << 24) | sd->sd_lobase;
1432 ssd->ssd_limit = (sd->sd_hilimit << 16) | sd->sd_lolimit;
1433 ssd->ssd_type = sd->sd_type;
1434 ssd->ssd_dpl = sd->sd_dpl;
1435 ssd->ssd_p = sd->sd_p;
1436 ssd->ssd_def32 = sd->sd_def32;
1437 ssd->ssd_gran = sd->sd_gran;
1441 * Populate the (physmap) array with base/bound pairs describing the
1442 * available physical memory in the system, then test this memory and
1443 * build the phys_avail array describing the actually-available memory.
1445 * If we cannot accurately determine the physical memory map, then use
1446 * value from the 0xE801 call, and failing that, the RTC.
1448 * Total memory size may be set by the kernel environment variable
1449 * hw.physmem or the compile-time define MAXMEM.
1452 getmemsize(int first)
1454 int i, physmap_idx, pa_indx, da_indx;
1456 u_int basemem, extmem;
1457 struct vm86frame vmf;
1458 struct vm86context vmc;
1460 vm_offset_t physmap[PHYSMAP_ENTRIES*2];
1468 quad_t dcons_addr, dcons_size;
1470 bzero(&vmf, sizeof(struct vm86frame));
1471 bzero(physmap, sizeof(physmap));
1475 * Some newer BIOSes has broken INT 12H implementation which cause
1476 * kernel panic immediately. In this case, we need to scan SMAP
1477 * with INT 15:E820 first, then determine base memory size.
1480 TUNABLE_INT_FETCH("hw.hasbrokenint12", &hasbrokenint12);
1481 if (hasbrokenint12) {
1486 * Perform "base memory" related probes & setup. If we get a crazy
1487 * value give the bios some scribble space just in case.
1489 vm86_intcall(0x12, &vmf);
1490 basemem = vmf.vmf_ax;
1491 if (basemem > 640) {
1492 kprintf("Preposterous BIOS basemem of %uK, "
1493 "truncating to < 640K\n", basemem);
1498 * XXX if biosbasemem is now < 640, there is a `hole'
1499 * between the end of base memory and the start of
1500 * ISA memory. The hole may be empty or it may
1501 * contain BIOS code or data. Map it read/write so
1502 * that the BIOS can write to it. (Memory from 0 to
1503 * the physical end of the kernel is mapped read-only
1504 * to begin with and then parts of it are remapped.
1505 * The parts that aren't remapped form holes that
1506 * remain read-only and are unused by the kernel.
1507 * The base memory area is below the physical end of
1508 * the kernel and right now forms a read-only hole.
1509 * The part of it from PAGE_SIZE to
1510 * (trunc_page(biosbasemem * 1024) - 1) will be
1511 * remapped and used by the kernel later.)
1513 * This code is similar to the code used in
1514 * pmap_mapdev, but since no memory needs to be
1515 * allocated we simply change the mapping.
1517 for (pa = trunc_page(basemem * 1024);
1518 pa < ISA_HOLE_START; pa += PAGE_SIZE) {
1519 pte = vtopte(pa + KERNBASE);
1520 *pte = pa | PG_RW | PG_V;
1524 * if basemem != 640, map pages r/w into vm86 page table so
1525 * that the bios can scribble on it.
1528 for (i = basemem / 4; i < 160; i++)
1529 pte[i] = (i << PAGE_SHIFT) | PG_V | PG_RW | PG_U;
1533 * map page 1 R/W into the kernel page table so we can use it
1534 * as a buffer. The kernel will unmap this page later.
1536 pte = vtopte(KERNBASE + (1 << PAGE_SHIFT));
1537 *pte = (1 << PAGE_SHIFT) | PG_RW | PG_V;
1540 * get memory map with INT 15:E820
1542 #define SMAPSIZ sizeof(*smap)
1543 #define SMAP_SIG 0x534D4150 /* 'SMAP' */
1546 smap = (void *)vm86_addpage(&vmc, 1, KERNBASE + (1 << PAGE_SHIFT));
1547 vm86_getptr(&vmc, (vm_offset_t)smap, &vmf.vmf_es, &vmf.vmf_di);
1552 vmf.vmf_eax = 0xE820;
1553 vmf.vmf_edx = SMAP_SIG;
1554 vmf.vmf_ecx = SMAPSIZ;
1555 i = vm86_datacall(0x15, &vmf, &vmc);
1556 if (i || vmf.vmf_eax != SMAP_SIG)
1558 if (boothowto & RB_VERBOSE)
1559 kprintf("SMAP type=%02x base=%08x %08x len=%08x %08x\n",
1561 *(u_int32_t *)((char *)&smap->base + 4),
1562 (u_int32_t)smap->base,
1563 *(u_int32_t *)((char *)&smap->length + 4),
1564 (u_int32_t)smap->length);
1566 if (smap->type != 0x01)
1569 if (smap->length == 0)
1572 Realmem += smap->length;
1574 if (smap->base >= 0xffffffffLLU) {
1575 kprintf("%ju MB of memory above 4GB ignored\n",
1576 (uintmax_t)(smap->length / 1024 / 1024));
1580 for (i = 0; i <= physmap_idx; i += 2) {
1581 if (smap->base < physmap[i + 1]) {
1582 if (boothowto & RB_VERBOSE) {
1583 kprintf("Overlapping or non-montonic "
1584 "memory region, ignoring "
1587 Realmem -= smap->length;
1592 if (smap->base == physmap[physmap_idx + 1]) {
1593 physmap[physmap_idx + 1] += smap->length;
1598 if (physmap_idx == PHYSMAP_ENTRIES*2) {
1599 kprintf("Too many segments in the physical "
1600 "address map, giving up\n");
1603 physmap[physmap_idx] = smap->base;
1604 physmap[physmap_idx + 1] = smap->base + smap->length;
1606 ; /* fix GCC3.x warning */
1607 } while (vmf.vmf_ebx != 0);
1610 * Perform "base memory" related probes & setup based on SMAP
1613 for (i = 0; i <= physmap_idx; i += 2) {
1614 if (physmap[i] == 0x00000000) {
1615 basemem = physmap[i + 1] / 1024;
1624 if (basemem > 640) {
1625 kprintf("Preposterous BIOS basemem of %uK, "
1626 "truncating to 640K\n", basemem);
1630 for (pa = trunc_page(basemem * 1024);
1631 pa < ISA_HOLE_START; pa += PAGE_SIZE) {
1632 pte = vtopte(pa + KERNBASE);
1633 *pte = pa | PG_RW | PG_V;
1637 for (i = basemem / 4; i < 160; i++)
1638 pte[i] = (i << PAGE_SHIFT) | PG_V | PG_RW | PG_U;
1641 if (physmap[1] != 0)
1645 * If we failed above, try memory map with INT 15:E801
1647 vmf.vmf_ax = 0xE801;
1648 if (vm86_intcall(0x15, &vmf) == 0) {
1649 extmem = vmf.vmf_cx + vmf.vmf_dx * 64;
1653 vm86_intcall(0x15, &vmf);
1654 extmem = vmf.vmf_ax;
1657 * Prefer the RTC value for extended memory.
1659 extmem = rtcin(RTC_EXTLO) + (rtcin(RTC_EXTHI) << 8);
1664 * Special hack for chipsets that still remap the 384k hole when
1665 * there's 16MB of memory - this really confuses people that
1666 * are trying to use bus mastering ISA controllers with the
1667 * "16MB limit"; they only have 16MB, but the remapping puts
1668 * them beyond the limit.
1670 * If extended memory is between 15-16MB (16-17MB phys address range),
1673 if ((extmem > 15 * 1024) && (extmem < 16 * 1024))
1677 physmap[1] = basemem * 1024;
1679 physmap[physmap_idx] = 0x100000;
1680 physmap[physmap_idx + 1] = physmap[physmap_idx] + extmem * 1024;
1684 * Now, physmap contains a map of physical memory.
1687 base_memory = physmap[1];
1689 /* make hole for AP bootstrap code YYY */
1690 physmap[1] = mp_bootaddress(base_memory);
1693 /* Save EBDA address, if any */
1694 ebda_addr = (u_long)(*(u_short *)(KERNBASE + 0x40e));
1698 * Maxmem isn't the "maximum memory", it's one larger than the
1699 * highest page of the physical address space. It should be
1700 * called something like "Maxphyspage". We may adjust this
1701 * based on ``hw.physmem'' and the results of the memory test.
1703 Maxmem = atop(physmap[physmap_idx + 1]);
1706 Maxmem = MAXMEM / 4;
1709 if (kgetenv_quad("hw.physmem", &maxmem))
1710 Maxmem = atop(maxmem);
1712 if (atop(physmap[physmap_idx + 1]) != Maxmem &&
1713 (boothowto & RB_VERBOSE))
1714 kprintf("Physical memory use set to %lluK\n", Maxmem * 4);
1717 * If Maxmem has been increased beyond what the system has detected,
1718 * extend the last memory segment to the new limit.
1720 if (atop(physmap[physmap_idx + 1]) < Maxmem)
1721 physmap[physmap_idx + 1] = ptoa(Maxmem);
1723 /* call pmap initialization to make new kernel address space */
1724 pmap_bootstrap(first, 0);
1727 * Size up each available chunk of physical memory.
1729 physmap[0] = PAGE_SIZE; /* mask off page 0 */
1732 phys_avail[pa_indx++] = physmap[0];
1733 phys_avail[pa_indx] = physmap[0];
1734 dump_avail[da_indx] = physmap[0];
1739 * Get dcons buffer address
1741 if (kgetenv_quad("dcons.addr", &dcons_addr) == 0 ||
1742 kgetenv_quad("dcons.size", &dcons_size) == 0)
1746 * physmap is in bytes, so when converting to page boundaries,
1747 * round up the start address and round down the end address.
1749 for (i = 0; i <= physmap_idx; i += 2) {
1753 if (physmap[i + 1] < end)
1754 end = trunc_page(physmap[i + 1]);
1755 for (pa = round_page(physmap[i]); pa < end; pa += PAGE_SIZE) {
1756 int tmp, page_bad, full;
1760 int *ptr = (int *)CADDR1;
1765 * block out kernel memory as not available.
1767 if (pa >= 0x100000 && pa < first)
1771 * block out dcons buffer
1774 && pa >= trunc_page(dcons_addr)
1775 && pa < dcons_addr + dcons_size)
1781 * map page into kernel: valid, read/write,non-cacheable
1783 *pte = pa | PG_V | PG_RW | PG_N;
1788 * Test for alternating 1's and 0's
1790 *(volatile int *)ptr = 0xaaaaaaaa;
1791 if (*(volatile int *)ptr != 0xaaaaaaaa) {
1795 * Test for alternating 0's and 1's
1797 *(volatile int *)ptr = 0x55555555;
1798 if (*(volatile int *)ptr != 0x55555555) {
1804 *(volatile int *)ptr = 0xffffffff;
1805 if (*(volatile int *)ptr != 0xffffffff) {
1811 *(volatile int *)ptr = 0x0;
1812 if (*(volatile int *)ptr != 0x0) {
1816 * Restore original value.
1821 * Adjust array of valid/good pages.
1823 if (page_bad == TRUE) {
1827 * If this good page is a continuation of the
1828 * previous set of good pages, then just increase
1829 * the end pointer. Otherwise start a new chunk.
1830 * Note that "end" points one higher than end,
1831 * making the range >= start and < end.
1832 * If we're also doing a speculative memory
1833 * test and we at or past the end, bump up Maxmem
1834 * so that we keep going. The first bad page
1835 * will terminate the loop.
1837 if (phys_avail[pa_indx] == pa) {
1838 phys_avail[pa_indx] += PAGE_SIZE;
1841 if (pa_indx >= PHYSMAP_ENTRIES*2) {
1842 kprintf("Too many holes in the physical address space, giving up\n");
1847 phys_avail[pa_indx++] = pa; /* start */
1848 phys_avail[pa_indx] = pa + PAGE_SIZE; /* end */
1852 if (dump_avail[da_indx] == pa) {
1853 dump_avail[da_indx] += PAGE_SIZE;
1856 if (da_indx >= PHYSMAP_ENTRIES*2) {
1860 dump_avail[da_indx++] = pa; /* start */
1861 dump_avail[da_indx] = pa + PAGE_SIZE; /* end */
1874 * The last chunk must contain at least one page plus the message
1875 * buffer to avoid complicating other code (message buffer address
1876 * calculation, etc.).
1878 while (phys_avail[pa_indx - 1] + PAGE_SIZE +
1879 round_page(MSGBUF_SIZE) >= phys_avail[pa_indx]) {
1880 physmem -= atop(phys_avail[pa_indx] - phys_avail[pa_indx - 1]);
1881 phys_avail[pa_indx--] = 0;
1882 phys_avail[pa_indx--] = 0;
1885 Maxmem = atop(phys_avail[pa_indx]);
1887 /* Trim off space for the message buffer. */
1888 phys_avail[pa_indx] -= round_page(MSGBUF_SIZE);
1890 avail_end = phys_avail[pa_indx];
1893 struct machintr_abi MachIntrABI;
1904 * 7 Device Not Available (x87)
1906 * 9 Coprocessor Segment overrun (unsupported, reserved)
1908 * 11 Segment not present
1910 * 13 General Protection
1913 * 16 x87 FP Exception pending
1914 * 17 Alignment Check
1916 * 19 SIMD floating point
1918 * 32-255 INTn/external sources
1923 struct gate_descriptor *gdp;
1924 int gsel_tss, metadata_missing, off, x;
1925 struct mdglobaldata *gd;
1928 * Prevent lowering of the ipl if we call tsleep() early.
1930 gd = &CPU_prvspace[0].mdglobaldata;
1931 bzero(gd, sizeof(*gd));
1933 gd->mi.gd_curthread = &thread0;
1934 thread0.td_gd = &gd->mi;
1936 atdevbase = ISA_HOLE_START + KERNBASE;
1938 metadata_missing = 0;
1939 if (bootinfo.bi_modulep) {
1940 preload_metadata = (caddr_t)bootinfo.bi_modulep + KERNBASE;
1941 preload_bootstrap_relocate(KERNBASE);
1943 metadata_missing = 1;
1945 if (bootinfo.bi_envp)
1946 kern_envp = (caddr_t)bootinfo.bi_envp + KERNBASE;
1948 if (boothowto & RB_VERBOSE)
1952 * Default MachIntrABI to ICU
1954 MachIntrABI = MachIntrABI_ICU;
1956 TUNABLE_INT_FETCH("hw.apic_io_enable", &ioapic_enable); /* for compat */
1957 TUNABLE_INT_FETCH("hw.ioapic_enable", &ioapic_enable);
1958 TUNABLE_INT_FETCH("hw.lapic_enable", &lapic_enable);
1961 * start with one cpu. Note: with one cpu, ncpus2_shift, ncpus2_mask,
1962 * and ncpus_fit_mask remain 0.
1967 /* Init basic tunables, hz etc */
1971 * make gdt memory segments, the code segment goes up to end of the
1972 * page with etext in it, the data segment goes to the end of
1976 * XXX text protection is temporarily (?) disabled. The limit was
1977 * i386_btop(round_page(etext)) - 1.
1979 gdt_segs[GCODE_SEL].ssd_limit = atop(0 - 1);
1980 gdt_segs[GDATA_SEL].ssd_limit = atop(0 - 1);
1982 gdt_segs[GPRIV_SEL].ssd_limit =
1983 atop(sizeof(struct privatespace) - 1);
1984 gdt_segs[GPRIV_SEL].ssd_base = (int) &CPU_prvspace[0];
1985 gdt_segs[GPROC0_SEL].ssd_base =
1986 (int) &CPU_prvspace[0].mdglobaldata.gd_common_tss;
1988 gd->mi.gd_prvspace = &CPU_prvspace[0];
1991 * Note: on both UP and SMP curthread must be set non-NULL
1992 * early in the boot sequence because the system assumes
1993 * that 'curthread' is never NULL.
1996 for (x = 0; x < NGDT; x++) {
1998 /* avoid overwriting db entries with APM ones */
1999 if (x >= GAPMCODE32_SEL && x <= GAPMDATA_SEL)
2002 ssdtosd(&gdt_segs[x], &gdt[x].sd);
2005 r_gdt.rd_limit = NGDT * sizeof(gdt[0]) - 1;
2006 r_gdt.rd_base = (int) gdt;
2009 mi_gdinit(&gd->mi, 0);
2011 mi_proc0init(&gd->mi, proc0paddr);
2012 safepri = TDPRI_MAX;
2014 /* make ldt memory segments */
2016 * XXX - VM_MAX_USER_ADDRESS is an end address, not a max. And it
2017 * should be spelled ...MAX_USER...
2019 ldt_segs[LUCODE_SEL].ssd_limit = atop(VM_MAX_USER_ADDRESS - 1);
2020 ldt_segs[LUDATA_SEL].ssd_limit = atop(VM_MAX_USER_ADDRESS - 1);
2021 for (x = 0; x < sizeof ldt_segs / sizeof ldt_segs[0]; x++)
2022 ssdtosd(&ldt_segs[x], &ldt[x].sd);
2024 _default_ldt = GSEL(GLDT_SEL, SEL_KPL);
2026 gd->gd_currentldt = _default_ldt;
2027 /* spinlocks and the BGL */
2031 * Setup the hardware exception table. Most exceptions use
2032 * SDT_SYS386TGT, known as a 'trap gate'. Trap gates leave
2033 * interrupts enabled. VM page faults use SDT_SYS386IGT, known as
2034 * an 'interrupt trap gate', which disables interrupts on entry,
2035 * in order to be able to poll the appropriate CRn register to
2036 * determine the fault address.
2038 for (x = 0; x < NIDT; x++) {
2039 #ifdef DEBUG_INTERRUPTS
2040 setidt(x, Xrsvdary[x], SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
2042 setidt(x, &IDTVEC(rsvd0), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
2045 setidt(0, &IDTVEC(div), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
2046 setidt(1, &IDTVEC(dbg), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
2047 setidt(2, &IDTVEC(nmi), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
2048 setidt(3, &IDTVEC(bpt), SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL));
2049 setidt(4, &IDTVEC(ofl), SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL));
2050 setidt(5, &IDTVEC(bnd), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
2051 setidt(6, &IDTVEC(ill), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
2052 setidt(7, &IDTVEC(dna), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
2053 setidt(8, 0, SDT_SYSTASKGT, SEL_KPL, GSEL(GPANIC_SEL, SEL_KPL));
2054 setidt(9, &IDTVEC(fpusegm), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
2055 setidt(10, &IDTVEC(tss), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
2056 setidt(11, &IDTVEC(missing), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
2057 setidt(12, &IDTVEC(stk), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
2058 setidt(13, &IDTVEC(prot), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
2059 setidt(14, &IDTVEC(page), SDT_SYS386IGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
2060 setidt(15, &IDTVEC(rsvd0), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
2061 setidt(16, &IDTVEC(fpu), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
2062 setidt(17, &IDTVEC(align), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
2063 setidt(18, &IDTVEC(mchk), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
2064 setidt(19, &IDTVEC(xmm), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
2065 setidt(0x80, &IDTVEC(int0x80_syscall),
2066 SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL));
2068 r_idt.rd_limit = sizeof(idt0) - 1;
2069 r_idt.rd_base = (int) idt;
2073 * Initialize the console before we print anything out.
2077 if (metadata_missing)
2078 kprintf("WARNING: loader(8) metadata is missing!\n");
2087 * Initialize IRQ mapping
2090 * SHOULD be after elcr_probe()
2092 MachIntrABI_ICU.initmap();
2094 MachIntrABI_IOAPIC.initmap();
2099 if (boothowto & RB_KDB)
2100 Debugger("Boot flags requested debugger");
2103 finishidentcpu(); /* Final stage of CPU initialization */
2104 setidt(6, &IDTVEC(ill), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
2105 setidt(13, &IDTVEC(prot), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
2106 initializecpu(); /* Initialize CPU registers */
2109 * make an initial tss so cpu can get interrupt stack on syscall!
2110 * The 16 bytes is to save room for a VM86 context.
2112 gd->gd_common_tss.tss_esp0 = (int) thread0.td_pcb - 16;
2113 gd->gd_common_tss.tss_ss0 = GSEL(GDATA_SEL, SEL_KPL) ;
2114 gsel_tss = GSEL(GPROC0_SEL, SEL_KPL);
2115 gd->gd_tss_gdt = &gdt[GPROC0_SEL].sd;
2116 gd->gd_common_tssd = *gd->gd_tss_gdt;
2117 gd->gd_common_tss.tss_ioopt = (sizeof gd->gd_common_tss) << 16;
2120 dblfault_tss.tss_esp = dblfault_tss.tss_esp0 = dblfault_tss.tss_esp1 =
2121 dblfault_tss.tss_esp2 = (int) &dblfault_stack[sizeof(dblfault_stack)];
2122 dblfault_tss.tss_ss = dblfault_tss.tss_ss0 = dblfault_tss.tss_ss1 =
2123 dblfault_tss.tss_ss2 = GSEL(GDATA_SEL, SEL_KPL);
2124 dblfault_tss.tss_cr3 = (int)IdlePTD;
2125 dblfault_tss.tss_eip = (int) dblfault_handler;
2126 dblfault_tss.tss_eflags = PSL_KERNEL;
2127 dblfault_tss.tss_ds = dblfault_tss.tss_es =
2128 dblfault_tss.tss_gs = GSEL(GDATA_SEL, SEL_KPL);
2129 dblfault_tss.tss_fs = GSEL(GPRIV_SEL, SEL_KPL);
2130 dblfault_tss.tss_cs = GSEL(GCODE_SEL, SEL_KPL);
2131 dblfault_tss.tss_ldt = GSEL(GLDT_SEL, SEL_KPL);
2135 init_param2(physmem);
2137 /* now running on new page tables, configured,and u/iom is accessible */
2139 /* Map the message buffer. */
2140 for (off = 0; off < round_page(MSGBUF_SIZE); off += PAGE_SIZE)
2141 pmap_kenter((vm_offset_t)msgbufp + off, avail_end + off);
2143 msgbufinit(msgbufp, MSGBUF_SIZE);
2145 /* make a call gate to reenter kernel with */
2146 gdp = &ldt[LSYS5CALLS_SEL].gd;
2148 x = (int) &IDTVEC(syscall);
2149 gdp->gd_looffset = x++;
2150 gdp->gd_selector = GSEL(GCODE_SEL,SEL_KPL);
2152 gdp->gd_type = SDT_SYS386CGT;
2153 gdp->gd_dpl = SEL_UPL;
2155 gdp->gd_hioffset = ((int) &IDTVEC(syscall)) >>16;
2157 /* XXX does this work? */
2158 ldt[LBSDICALLS_SEL] = ldt[LSYS5CALLS_SEL];
2159 ldt[LSOL26CALLS_SEL] = ldt[LSYS5CALLS_SEL];
2161 /* transfer to user mode */
2163 _ucodesel = LSEL(LUCODE_SEL, SEL_UPL);
2164 _udatasel = LSEL(LUDATA_SEL, SEL_UPL);
2166 /* setup proc 0's pcb */
2167 thread0.td_pcb->pcb_flags = 0;
2168 thread0.td_pcb->pcb_cr3 = (int)IdlePTD; /* should already be setup */
2169 thread0.td_pcb->pcb_ext = 0;
2170 lwp0.lwp_md.md_regs = &proc0_tf;
2174 * Initialize machine-dependant portions of the global data structure.
2175 * Note that the global data area and cpu0's idlestack in the private
2176 * data space were allocated in locore.
2178 * Note: the idlethread's cpl is 0
2180 * WARNING! Called from early boot, 'mycpu' may not work yet.
2183 cpu_gdinit(struct mdglobaldata *gd, int cpu)
2186 gd->mi.gd_curthread = &gd->mi.gd_idlethread;
2188 lwkt_init_thread(&gd->mi.gd_idlethread,
2189 gd->mi.gd_prvspace->idlestack,
2190 sizeof(gd->mi.gd_prvspace->idlestack),
2192 lwkt_set_comm(&gd->mi.gd_idlethread, "idle_%d", cpu);
2193 gd->mi.gd_idlethread.td_switch = cpu_lwkt_switch;
2194 gd->mi.gd_idlethread.td_sp -= sizeof(void *);
2195 *(void **)gd->mi.gd_idlethread.td_sp = cpu_idle_restore;
2199 is_globaldata_space(vm_offset_t saddr, vm_offset_t eaddr)
2201 if (saddr >= (vm_offset_t)&CPU_prvspace[0] &&
2202 eaddr <= (vm_offset_t)&CPU_prvspace[MAXCPU]) {
2209 globaldata_find(int cpu)
2211 KKASSERT(cpu >= 0 && cpu < ncpus);
2212 return(&CPU_prvspace[cpu].mdglobaldata.mi);
2215 #if defined(I586_CPU) && !defined(NO_F00F_HACK)
2216 static void f00f_hack(void *unused);
2217 SYSINIT(f00f_hack, SI_BOOT2_BIOS, SI_ORDER_ANY, f00f_hack, NULL);
2220 f00f_hack(void *unused)
2222 struct gate_descriptor *new_idt;
2228 kprintf("Intel Pentium detected, installing workaround for F00F bug\n");
2230 r_idt.rd_limit = sizeof(idt0) - 1;
2232 tmp = kmem_alloc(&kernel_map, PAGE_SIZE * 2);
2234 panic("kmem_alloc returned 0");
2235 if (((unsigned int)tmp & (PAGE_SIZE-1)) != 0)
2236 panic("kmem_alloc returned non-page-aligned memory");
2237 /* Put the first seven entries in the lower page */
2238 new_idt = (struct gate_descriptor*)(tmp + PAGE_SIZE - (7*8));
2239 bcopy(idt, new_idt, sizeof(idt0));
2240 r_idt.rd_base = (int)new_idt;
2243 if (vm_map_protect(&kernel_map, tmp, tmp + PAGE_SIZE,
2244 VM_PROT_READ, FALSE) != KERN_SUCCESS)
2245 panic("vm_map_protect failed");
2248 #endif /* defined(I586_CPU) && !NO_F00F_HACK */
2251 ptrace_set_pc(struct lwp *lp, unsigned long addr)
2253 lp->lwp_md.md_regs->tf_eip = addr;
2258 ptrace_single_step(struct lwp *lp)
2260 lp->lwp_md.md_regs->tf_eflags |= PSL_T;
2265 fill_regs(struct lwp *lp, struct reg *regs)
2267 struct trapframe *tp;
2269 tp = lp->lwp_md.md_regs;
2270 regs->r_gs = tp->tf_gs;
2271 regs->r_fs = tp->tf_fs;
2272 regs->r_es = tp->tf_es;
2273 regs->r_ds = tp->tf_ds;
2274 regs->r_edi = tp->tf_edi;
2275 regs->r_esi = tp->tf_esi;
2276 regs->r_ebp = tp->tf_ebp;
2277 regs->r_ebx = tp->tf_ebx;
2278 regs->r_edx = tp->tf_edx;
2279 regs->r_ecx = tp->tf_ecx;
2280 regs->r_eax = tp->tf_eax;
2281 regs->r_eip = tp->tf_eip;
2282 regs->r_cs = tp->tf_cs;
2283 regs->r_eflags = tp->tf_eflags;
2284 regs->r_esp = tp->tf_esp;
2285 regs->r_ss = tp->tf_ss;
2290 set_regs(struct lwp *lp, struct reg *regs)
2292 struct trapframe *tp;
2294 tp = lp->lwp_md.md_regs;
2295 if (!EFL_SECURE(regs->r_eflags, tp->tf_eflags) ||
2296 !CS_SECURE(regs->r_cs))
2298 tp->tf_gs = regs->r_gs;
2299 tp->tf_fs = regs->r_fs;
2300 tp->tf_es = regs->r_es;
2301 tp->tf_ds = regs->r_ds;
2302 tp->tf_edi = regs->r_edi;
2303 tp->tf_esi = regs->r_esi;
2304 tp->tf_ebp = regs->r_ebp;
2305 tp->tf_ebx = regs->r_ebx;
2306 tp->tf_edx = regs->r_edx;
2307 tp->tf_ecx = regs->r_ecx;
2308 tp->tf_eax = regs->r_eax;
2309 tp->tf_eip = regs->r_eip;
2310 tp->tf_cs = regs->r_cs;
2311 tp->tf_eflags = regs->r_eflags;
2312 tp->tf_esp = regs->r_esp;
2313 tp->tf_ss = regs->r_ss;
2317 #ifndef CPU_DISABLE_SSE
2319 fill_fpregs_xmm(struct savexmm *sv_xmm, struct save87 *sv_87)
2321 struct env87 *penv_87 = &sv_87->sv_env;
2322 struct envxmm *penv_xmm = &sv_xmm->sv_env;
2325 /* FPU control/status */
2326 penv_87->en_cw = penv_xmm->en_cw;
2327 penv_87->en_sw = penv_xmm->en_sw;
2328 penv_87->en_tw = penv_xmm->en_tw;
2329 penv_87->en_fip = penv_xmm->en_fip;
2330 penv_87->en_fcs = penv_xmm->en_fcs;
2331 penv_87->en_opcode = penv_xmm->en_opcode;
2332 penv_87->en_foo = penv_xmm->en_foo;
2333 penv_87->en_fos = penv_xmm->en_fos;
2336 for (i = 0; i < 8; ++i)
2337 sv_87->sv_ac[i] = sv_xmm->sv_fp[i].fp_acc;
2341 set_fpregs_xmm(struct save87 *sv_87, struct savexmm *sv_xmm)
2343 struct env87 *penv_87 = &sv_87->sv_env;
2344 struct envxmm *penv_xmm = &sv_xmm->sv_env;
2347 /* FPU control/status */
2348 penv_xmm->en_cw = penv_87->en_cw;
2349 penv_xmm->en_sw = penv_87->en_sw;
2350 penv_xmm->en_tw = penv_87->en_tw;
2351 penv_xmm->en_fip = penv_87->en_fip;
2352 penv_xmm->en_fcs = penv_87->en_fcs;
2353 penv_xmm->en_opcode = penv_87->en_opcode;
2354 penv_xmm->en_foo = penv_87->en_foo;
2355 penv_xmm->en_fos = penv_87->en_fos;
2358 for (i = 0; i < 8; ++i)
2359 sv_xmm->sv_fp[i].fp_acc = sv_87->sv_ac[i];
2361 #endif /* CPU_DISABLE_SSE */
2364 fill_fpregs(struct lwp *lp, struct fpreg *fpregs)
2366 #ifndef CPU_DISABLE_SSE
2368 fill_fpregs_xmm(&lp->lwp_thread->td_pcb->pcb_save.sv_xmm,
2369 (struct save87 *)fpregs);
2372 #endif /* CPU_DISABLE_SSE */
2373 bcopy(&lp->lwp_thread->td_pcb->pcb_save.sv_87, fpregs, sizeof *fpregs);
2378 set_fpregs(struct lwp *lp, struct fpreg *fpregs)
2380 #ifndef CPU_DISABLE_SSE
2382 set_fpregs_xmm((struct save87 *)fpregs,
2383 &lp->lwp_thread->td_pcb->pcb_save.sv_xmm);
2386 #endif /* CPU_DISABLE_SSE */
2387 bcopy(fpregs, &lp->lwp_thread->td_pcb->pcb_save.sv_87, sizeof *fpregs);
2392 fill_dbregs(struct lwp *lp, struct dbreg *dbregs)
2395 dbregs->dr0 = rdr0();
2396 dbregs->dr1 = rdr1();
2397 dbregs->dr2 = rdr2();
2398 dbregs->dr3 = rdr3();
2399 dbregs->dr4 = rdr4();
2400 dbregs->dr5 = rdr5();
2401 dbregs->dr6 = rdr6();
2402 dbregs->dr7 = rdr7();
2406 pcb = lp->lwp_thread->td_pcb;
2407 dbregs->dr0 = pcb->pcb_dr0;
2408 dbregs->dr1 = pcb->pcb_dr1;
2409 dbregs->dr2 = pcb->pcb_dr2;
2410 dbregs->dr3 = pcb->pcb_dr3;
2413 dbregs->dr6 = pcb->pcb_dr6;
2414 dbregs->dr7 = pcb->pcb_dr7;
2420 set_dbregs(struct lwp *lp, struct dbreg *dbregs)
2423 load_dr0(dbregs->dr0);
2424 load_dr1(dbregs->dr1);
2425 load_dr2(dbregs->dr2);
2426 load_dr3(dbregs->dr3);
2427 load_dr4(dbregs->dr4);
2428 load_dr5(dbregs->dr5);
2429 load_dr6(dbregs->dr6);
2430 load_dr7(dbregs->dr7);
2433 struct ucred *ucred;
2435 uint32_t mask1, mask2;
2438 * Don't let an illegal value for dr7 get set. Specifically,
2439 * check for undefined settings. Setting these bit patterns
2440 * result in undefined behaviour and can lead to an unexpected
2443 for (i = 0, mask1 = 0x3<<16, mask2 = 0x2<<16; i < 8;
2444 i++, mask1 <<= 2, mask2 <<= 2)
2445 if ((dbregs->dr7 & mask1) == mask2)
2448 pcb = lp->lwp_thread->td_pcb;
2449 ucred = lp->lwp_proc->p_ucred;
2452 * Don't let a process set a breakpoint that is not within the
2453 * process's address space. If a process could do this, it
2454 * could halt the system by setting a breakpoint in the kernel
2455 * (if ddb was enabled). Thus, we need to check to make sure
2456 * that no breakpoints are being enabled for addresses outside
2457 * process's address space, unless, perhaps, we were called by
2460 * XXX - what about when the watched area of the user's
2461 * address space is written into from within the kernel
2462 * ... wouldn't that still cause a breakpoint to be generated
2463 * from within kernel mode?
2466 if (priv_check_cred(ucred, PRIV_ROOT, 0) != 0) {
2467 if (dbregs->dr7 & 0x3) {
2468 /* dr0 is enabled */
2469 if (dbregs->dr0 >= VM_MAX_USER_ADDRESS)
2473 if (dbregs->dr7 & (0x3<<2)) {
2474 /* dr1 is enabled */
2475 if (dbregs->dr1 >= VM_MAX_USER_ADDRESS)
2479 if (dbregs->dr7 & (0x3<<4)) {
2480 /* dr2 is enabled */
2481 if (dbregs->dr2 >= VM_MAX_USER_ADDRESS)
2485 if (dbregs->dr7 & (0x3<<6)) {
2486 /* dr3 is enabled */
2487 if (dbregs->dr3 >= VM_MAX_USER_ADDRESS)
2492 pcb->pcb_dr0 = dbregs->dr0;
2493 pcb->pcb_dr1 = dbregs->dr1;
2494 pcb->pcb_dr2 = dbregs->dr2;
2495 pcb->pcb_dr3 = dbregs->dr3;
2496 pcb->pcb_dr6 = dbregs->dr6;
2497 pcb->pcb_dr7 = dbregs->dr7;
2499 pcb->pcb_flags |= PCB_DBREGS;
2506 * Return > 0 if a hardware breakpoint has been hit, and the
2507 * breakpoint was in user space. Return 0, otherwise.
2510 user_dbreg_trap(void)
2512 u_int32_t dr7, dr6; /* debug registers dr6 and dr7 */
2513 u_int32_t bp; /* breakpoint bits extracted from dr6 */
2514 int nbp; /* number of breakpoints that triggered */
2515 caddr_t addr[4]; /* breakpoint addresses */
2519 if ((dr7 & 0x000000ff) == 0) {
2521 * all GE and LE bits in the dr7 register are zero,
2522 * thus the trap couldn't have been caused by the
2523 * hardware debug registers
2530 bp = dr6 & 0x0000000f;
2534 * None of the breakpoint bits are set meaning this
2535 * trap was not caused by any of the debug registers
2541 * at least one of the breakpoints were hit, check to see
2542 * which ones and if any of them are user space addresses
2546 addr[nbp++] = (caddr_t)rdr0();
2549 addr[nbp++] = (caddr_t)rdr1();
2552 addr[nbp++] = (caddr_t)rdr2();
2555 addr[nbp++] = (caddr_t)rdr3();
2558 for (i=0; i<nbp; i++) {
2560 (caddr_t)VM_MAX_USER_ADDRESS) {
2562 * addr[i] is in user space
2569 * None of the breakpoints are in user space.
2577 Debugger(const char *msg)
2579 kprintf("Debugger(\"%s\") called.\n", msg);
2586 * Provide inb() and outb() as functions. They are normally only
2587 * available as macros calling inlined functions, thus cannot be
2588 * called inside DDB.
2590 * The actual code is stolen from <machine/cpufunc.h>, and de-inlined.
2596 /* silence compiler warnings */
2598 void outb(u_int, u_char);
2605 * We use %%dx and not %1 here because i/o is done at %dx and not at
2606 * %edx, while gcc generates inferior code (movw instead of movl)
2607 * if we tell it to load (u_short) port.
2609 __asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port));
2614 outb(u_int port, u_char data)
2618 * Use an unnecessary assignment to help gcc's register allocator.
2619 * This make a large difference for gcc-1.40 and a tiny difference
2620 * for gcc-2.6.0. For gcc-1.40, al had to be ``asm("ax")'' for
2621 * best results. gcc-2.6.0 can't handle this.
2624 __asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port));
2631 #include "opt_cpu.h"
2635 * initialize all the SMP locks
2638 /* critical region when masking or unmasking interupts */
2639 struct spinlock_deprecated imen_spinlock;
2641 /* critical region for old style disable_intr/enable_intr */
2642 struct spinlock_deprecated mpintr_spinlock;
2644 /* critical region around INTR() routines */
2645 struct spinlock_deprecated intr_spinlock;
2647 /* lock region used by kernel profiling */
2648 struct spinlock_deprecated mcount_spinlock;
2650 /* locks com (tty) data/hardware accesses: a FASTINTR() */
2651 struct spinlock_deprecated com_spinlock;
2653 /* lock regions around the clock hardware */
2654 struct spinlock_deprecated clock_spinlock;
2656 /* lock around the MP rendezvous */
2657 struct spinlock_deprecated smp_rv_spinlock;
2664 * Get the initial mplock with a count of 1 for the BSP.
2665 * This uses a LOGICAL cpu ID, ie BSP == 0.
2667 cpu_get_initial_mplock();
2670 spin_lock_init(&mcount_spinlock);
2671 spin_lock_init(&intr_spinlock);
2672 spin_lock_init(&mpintr_spinlock);
2673 spin_lock_init(&imen_spinlock);
2674 spin_lock_init(&smp_rv_spinlock);
2675 spin_lock_init(&com_spinlock);
2676 spin_lock_init(&clock_spinlock);
2678 /* our token pool needs to work early */
2679 lwkt_token_pool_init();