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>
127 #define PHYSMAP_ENTRIES 10
129 extern void init386(int first);
130 extern void dblfault_handler(void);
132 extern void printcpuinfo(void); /* XXX header file */
133 extern void finishidentcpu(void);
134 extern void panicifcpuunsupported(void);
135 extern void initializecpu(void);
137 static void cpu_startup(void *);
138 #ifndef CPU_DISABLE_SSE
139 static void set_fpregs_xmm(struct save87 *, struct savexmm *);
140 static void fill_fpregs_xmm(struct savexmm *, struct save87 *);
141 #endif /* CPU_DISABLE_SSE */
143 extern void ffs_rawread_setup(void);
144 #endif /* DIRECTIO */
145 static void init_locks(void);
147 SYSINIT(cpu, SI_BOOT2_START_CPU, SI_ORDER_FIRST, cpu_startup, NULL)
149 int _udatasel, _ucodesel;
152 int64_t tsc_offsets[MAXCPU];
154 int64_t tsc_offsets[1];
157 #if defined(SWTCH_OPTIM_STATS)
158 extern int swtch_optim_stats;
159 SYSCTL_INT(_debug, OID_AUTO, swtch_optim_stats,
160 CTLFLAG_RD, &swtch_optim_stats, 0, "");
161 SYSCTL_INT(_debug, OID_AUTO, tlb_flush_count,
162 CTLFLAG_RD, &tlb_flush_count, 0, "");
167 u_long ebda_addr = 0;
169 int imcr_present = 0;
171 int naps = 0; /* # of Applications processors */
176 sysctl_hw_physmem(SYSCTL_HANDLER_ARGS)
178 u_long pmem = ctob(physmem);
180 int error = sysctl_handle_long(oidp, &pmem, 0, req);
184 SYSCTL_PROC(_hw, HW_PHYSMEM, physmem, CTLTYPE_ULONG|CTLFLAG_RD,
185 0, 0, sysctl_hw_physmem, "LU", "Total system memory in bytes (number of pages * page size)");
188 sysctl_hw_usermem(SYSCTL_HANDLER_ARGS)
190 int error = sysctl_handle_int(oidp, 0,
191 ctob(physmem - vmstats.v_wire_count), req);
195 SYSCTL_PROC(_hw, HW_USERMEM, usermem, CTLTYPE_INT|CTLFLAG_RD,
196 0, 0, sysctl_hw_usermem, "IU", "");
199 sysctl_hw_availpages(SYSCTL_HANDLER_ARGS)
201 int error = sysctl_handle_int(oidp, 0,
202 i386_btop(avail_end - avail_start), req);
206 SYSCTL_PROC(_hw, OID_AUTO, availpages, CTLTYPE_INT|CTLFLAG_RD,
207 0, 0, sysctl_hw_availpages, "I", "");
212 vm_paddr_t phys_avail[PHYSMAP_ENTRIES*2+2];
213 vm_paddr_t dump_avail[PHYSMAP_ENTRIES*2+2];
216 static vm_offset_t buffer_sva, buffer_eva;
217 vm_offset_t clean_sva, clean_eva;
218 static vm_offset_t pager_sva, pager_eva;
219 static struct trapframe proc0_tf;
222 cpu_startup(void *dummy)
226 vm_offset_t firstaddr;
229 * Good {morning,afternoon,evening,night}.
231 kprintf("%s", version);
234 panicifcpuunsupported();
238 kprintf("real memory = %ju (%ju MB)\n",
240 (intmax_t)Realmem / 1024 / 1024);
242 * Display any holes after the first chunk of extended memory.
247 kprintf("Physical memory chunk(s):\n");
248 for (indx = 0; phys_avail[indx + 1] != 0; indx += 2) {
249 vm_paddr_t size1 = phys_avail[indx + 1] - phys_avail[indx];
251 kprintf("0x%08llx - 0x%08llx, %llu bytes (%llu pages)\n",
252 phys_avail[indx], phys_avail[indx + 1] - 1, size1,
258 * Allocate space for system data structures.
259 * The first available kernel virtual address is in "v".
260 * As pages of kernel virtual memory are allocated, "v" is incremented.
261 * As pages of memory are allocated and cleared,
262 * "firstaddr" is incremented.
263 * An index into the kernel page table corresponding to the
264 * virtual memory address maintained in "v" is kept in "mapaddr".
268 * Make two passes. The first pass calculates how much memory is
269 * needed and allocates it. The second pass assigns virtual
270 * addresses to the various data structures.
274 v = (caddr_t)firstaddr;
276 #define valloc(name, type, num) \
277 (name) = (type *)v; v = (caddr_t)((name)+(num))
278 #define valloclim(name, type, num, lim) \
279 (name) = (type *)v; v = (caddr_t)((lim) = ((name)+(num)))
282 * The nominal buffer size (and minimum KVA allocation) is BKVASIZE.
283 * For the first 64MB of ram nominally allocate sufficient buffers to
284 * cover 1/4 of our ram. Beyond the first 64MB allocate additional
285 * buffers to cover 1/20 of our ram over 64MB. When auto-sizing
286 * the buffer cache we limit the eventual kva reservation to
289 * factor represents the 1/4 x ram conversion.
292 int factor = 4 * BKVASIZE / 1024;
293 int kbytes = physmem * (PAGE_SIZE / 1024);
297 nbuf += min((kbytes - 4096) / factor, 65536 / factor);
299 nbuf += (kbytes - 65536) * 2 / (factor * 5);
300 if (maxbcache && nbuf > maxbcache / BKVASIZE)
301 nbuf = maxbcache / BKVASIZE;
305 * Do not allow the buffer_map to be more then 1/2 the size of the
308 if (nbuf > (virtual_end - virtual_start) / (BKVASIZE * 2)) {
309 nbuf = (virtual_end - virtual_start) / (BKVASIZE * 2);
310 kprintf("Warning: nbufs capped at %d\n", nbuf);
313 /* limit to 128 on i386 */
314 nswbuf = max(min(nbuf/4, 128), 16);
316 if (nswbuf < NSWBUF_MIN)
323 valloc(swbuf, struct buf, nswbuf);
324 valloc(buf, struct buf, nbuf);
327 * End of first pass, size has been calculated so allocate memory
329 if (firstaddr == 0) {
330 size = (vm_size_t)(v - firstaddr);
331 firstaddr = kmem_alloc(&kernel_map, round_page(size));
333 panic("startup: no room for tables");
338 * End of second pass, addresses have been assigned
340 if ((vm_size_t)(v - firstaddr) != size)
341 panic("startup: table size inconsistency");
343 kmem_suballoc(&kernel_map, &clean_map, &clean_sva, &clean_eva,
344 (nbuf*BKVASIZE) + (nswbuf*MAXPHYS) + pager_map_size);
345 kmem_suballoc(&clean_map, &buffer_map, &buffer_sva, &buffer_eva,
347 buffer_map.system_map = 1;
348 kmem_suballoc(&clean_map, &pager_map, &pager_sva, &pager_eva,
349 (nswbuf*MAXPHYS) + pager_map_size);
350 pager_map.system_map = 1;
352 #if defined(USERCONFIG)
354 cninit(); /* the preferred console may have changed */
357 kprintf("avail memory = %ju (%ju MB)\n",
358 (intmax_t)ptoa(vmstats.v_free_count),
359 (intmax_t)ptoa(vmstats.v_free_count) / 1024 / 1024);
362 * Set up buffers, so they can be used to read disk labels.
365 vm_pager_bufferinit();
367 /* Log ELCR information */
372 * OK, enough kmem_alloc/malloc state should be up, lets get on with it!
374 mp_start(); /* fire up the APs and APICs */
379 MachIntrABI.finalize();
385 * Send an interrupt to process.
387 * Stack is set up to allow sigcode stored
388 * at top to call routine, followed by kcall
389 * to sigreturn routine below. After sigreturn
390 * resets the signal mask, the stack, and the
391 * frame pointer, it returns to the user
395 sendsig(sig_t catcher, int sig, sigset_t *mask, u_long code)
397 struct lwp *lp = curthread->td_lwp;
398 struct proc *p = lp->lwp_proc;
399 struct trapframe *regs;
400 struct sigacts *psp = p->p_sigacts;
401 struct sigframe sf, *sfp;
404 regs = lp->lwp_md.md_regs;
405 oonstack = (lp->lwp_sigstk.ss_flags & SS_ONSTACK) ? 1 : 0;
407 /* save user context */
408 bzero(&sf, sizeof(struct sigframe));
409 sf.sf_uc.uc_sigmask = *mask;
410 sf.sf_uc.uc_stack = lp->lwp_sigstk;
411 sf.sf_uc.uc_mcontext.mc_onstack = oonstack;
412 bcopy(regs, &sf.sf_uc.uc_mcontext.mc_gs, sizeof(struct trapframe));
414 /* make the size of the saved context visible to userland */
415 sf.sf_uc.uc_mcontext.mc_len = sizeof(sf.sf_uc.uc_mcontext);
417 /* save mailbox pending state for syscall interlock semantics */
418 if (p->p_flag & P_MAILBOX)
419 sf.sf_uc.uc_mcontext.mc_xflags |= PGEX_MAILBOX;
421 /* Allocate and validate space for the signal handler context. */
422 if ((lp->lwp_flag & LWP_ALTSTACK) != 0 && !oonstack &&
423 SIGISMEMBER(psp->ps_sigonstack, sig)) {
424 sfp = (struct sigframe *)(lp->lwp_sigstk.ss_sp +
425 lp->lwp_sigstk.ss_size - sizeof(struct sigframe));
426 lp->lwp_sigstk.ss_flags |= SS_ONSTACK;
428 sfp = (struct sigframe *)regs->tf_esp - 1;
431 /* Translate the signal is appropriate */
432 if (p->p_sysent->sv_sigtbl) {
433 if (sig <= p->p_sysent->sv_sigsize)
434 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)];
437 /* Build the argument list for the signal handler. */
439 sf.sf_ucontext = (register_t)&sfp->sf_uc;
440 if (SIGISMEMBER(psp->ps_siginfo, sig)) {
441 /* Signal handler installed with SA_SIGINFO. */
442 sf.sf_siginfo = (register_t)&sfp->sf_si;
443 sf.sf_ahu.sf_action = (__siginfohandler_t *)catcher;
445 /* fill siginfo structure */
446 sf.sf_si.si_signo = sig;
447 sf.sf_si.si_code = code;
448 sf.sf_si.si_addr = (void*)regs->tf_err;
451 /* Old FreeBSD-style arguments. */
452 sf.sf_siginfo = code;
453 sf.sf_addr = regs->tf_err;
454 sf.sf_ahu.sf_handler = catcher;
458 * If we're a vm86 process, we want to save the segment registers.
459 * We also change eflags to be our emulated eflags, not the actual
462 if (regs->tf_eflags & PSL_VM) {
463 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs;
464 struct vm86_kernel *vm86 = &lp->lwp_thread->td_pcb->pcb_ext->ext_vm86;
466 sf.sf_uc.uc_mcontext.mc_gs = tf->tf_vm86_gs;
467 sf.sf_uc.uc_mcontext.mc_fs = tf->tf_vm86_fs;
468 sf.sf_uc.uc_mcontext.mc_es = tf->tf_vm86_es;
469 sf.sf_uc.uc_mcontext.mc_ds = tf->tf_vm86_ds;
471 if (vm86->vm86_has_vme == 0)
472 sf.sf_uc.uc_mcontext.mc_eflags =
473 (tf->tf_eflags & ~(PSL_VIF | PSL_VIP)) |
474 (vm86->vm86_eflags & (PSL_VIF | PSL_VIP));
477 * Clear PSL_NT to inhibit T_TSSFLT faults on return from
478 * syscalls made by the signal handler. This just avoids
479 * wasting time for our lazy fixup of such faults. PSL_NT
480 * does nothing in vm86 mode, but vm86 programs can set it
481 * almost legitimately in probes for old cpu types.
483 tf->tf_eflags &= ~(PSL_VM | PSL_NT | PSL_VIF | PSL_VIP);
487 * Save the FPU state and reinit the FP unit
489 npxpush(&sf.sf_uc.uc_mcontext);
492 * Copy the sigframe out to the user's stack.
494 if (copyout(&sf, sfp, sizeof(struct sigframe)) != 0) {
496 * Something is wrong with the stack pointer.
497 * ...Kill the process.
502 regs->tf_esp = (int)sfp;
503 regs->tf_eip = PS_STRINGS - *(p->p_sysent->sv_szsigcode);
506 * i386 abi specifies that the direction flag must be cleared
509 regs->tf_eflags &= ~(PSL_T|PSL_D);
511 regs->tf_cs = _ucodesel;
512 regs->tf_ds = _udatasel;
513 regs->tf_es = _udatasel;
516 * Allow the signal handler to inherit %fs in addition to %gs as
517 * the userland program might be using both.
519 * However, if a T_PROTFLT occured the segment registers could be
520 * totally broken. They must be reset in order to be able to
521 * return to userland.
523 if (regs->tf_trapno == T_PROTFLT) {
524 regs->tf_fs = _udatasel;
525 regs->tf_gs = _udatasel;
527 regs->tf_ss = _udatasel;
531 * Sanitize the trapframe for a virtual kernel passing control to a custom
532 * VM context. Remove any items that would otherwise create a privilage
535 * XXX at the moment we allow userland to set the resume flag. Is this a
539 cpu_sanitize_frame(struct trapframe *frame)
541 frame->tf_cs = _ucodesel;
542 frame->tf_ds = _udatasel;
543 frame->tf_es = _udatasel; /* XXX allow userland this one too? */
545 frame->tf_fs = _udatasel;
546 frame->tf_gs = _udatasel;
548 frame->tf_ss = _udatasel;
549 frame->tf_eflags &= (PSL_RF | PSL_USERCHANGE);
550 frame->tf_eflags |= PSL_RESERVED_DEFAULT | PSL_I;
555 cpu_sanitize_tls(struct savetls *tls)
557 struct segment_descriptor *desc;
560 for (i = 0; i < NGTLS; ++i) {
562 if (desc->sd_dpl == 0 && desc->sd_type == 0)
564 if (desc->sd_def32 == 0)
566 if (desc->sd_type != SDT_MEMRWA)
568 if (desc->sd_dpl != SEL_UPL)
570 if (desc->sd_xx != 0 || desc->sd_p != 1)
577 * sigreturn(ucontext_t *sigcntxp)
579 * System call to cleanup state after a signal
580 * has been taken. Reset signal mask and
581 * stack state from context left by sendsig (above).
582 * Return to previous pc and psl as specified by
583 * context left by sendsig. Check carefully to
584 * make sure that the user has not modified the
585 * state to gain improper privileges.
589 #define EFL_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0)
590 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL)
593 sys_sigreturn(struct sigreturn_args *uap)
595 struct lwp *lp = curthread->td_lwp;
596 struct proc *p = lp->lwp_proc;
597 struct trapframe *regs;
605 * We have to copy the information into kernel space so userland
606 * can't modify it while we are sniffing it.
608 regs = lp->lwp_md.md_regs;
609 error = copyin(uap->sigcntxp, &uc, sizeof(uc));
613 eflags = ucp->uc_mcontext.mc_eflags;
615 if (eflags & PSL_VM) {
616 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs;
617 struct vm86_kernel *vm86;
620 * if pcb_ext == 0 or vm86_inited == 0, the user hasn't
621 * set up the vm86 area, and we can't enter vm86 mode.
623 if (lp->lwp_thread->td_pcb->pcb_ext == 0)
625 vm86 = &lp->lwp_thread->td_pcb->pcb_ext->ext_vm86;
626 if (vm86->vm86_inited == 0)
629 /* go back to user mode if both flags are set */
630 if ((eflags & PSL_VIP) && (eflags & PSL_VIF))
631 trapsignal(lp, SIGBUS, 0);
633 if (vm86->vm86_has_vme) {
634 eflags = (tf->tf_eflags & ~VME_USERCHANGE) |
635 (eflags & VME_USERCHANGE) | PSL_VM;
637 vm86->vm86_eflags = eflags; /* save VIF, VIP */
638 eflags = (tf->tf_eflags & ~VM_USERCHANGE) |
639 (eflags & VM_USERCHANGE) | PSL_VM;
641 bcopy(&ucp->uc_mcontext.mc_gs, tf, sizeof(struct trapframe));
642 tf->tf_eflags = eflags;
643 tf->tf_vm86_ds = tf->tf_ds;
644 tf->tf_vm86_es = tf->tf_es;
645 tf->tf_vm86_fs = tf->tf_fs;
646 tf->tf_vm86_gs = tf->tf_gs;
647 tf->tf_ds = _udatasel;
648 tf->tf_es = _udatasel;
650 tf->tf_fs = _udatasel;
651 tf->tf_gs = _udatasel;
655 * Don't allow users to change privileged or reserved flags.
658 * XXX do allow users to change the privileged flag PSL_RF.
659 * The cpu sets PSL_RF in tf_eflags for faults. Debuggers
660 * should sometimes set it there too. tf_eflags is kept in
661 * the signal context during signal handling and there is no
662 * other place to remember it, so the PSL_RF bit may be
663 * corrupted by the signal handler without us knowing.
664 * Corruption of the PSL_RF bit at worst causes one more or
665 * one less debugger trap, so allowing it is fairly harmless.
667 if (!EFL_SECURE(eflags & ~PSL_RF, regs->tf_eflags & ~PSL_RF)) {
668 kprintf("sigreturn: eflags = 0x%x\n", eflags);
673 * Don't allow users to load a valid privileged %cs. Let the
674 * hardware check for invalid selectors, excess privilege in
675 * other selectors, invalid %eip's and invalid %esp's.
677 cs = ucp->uc_mcontext.mc_cs;
678 if (!CS_SECURE(cs)) {
679 kprintf("sigreturn: cs = 0x%x\n", cs);
680 trapsignal(lp, SIGBUS, T_PROTFLT);
683 bcopy(&ucp->uc_mcontext.mc_gs, regs, sizeof(struct trapframe));
687 * Restore the FPU state from the frame
690 npxpop(&ucp->uc_mcontext);
693 * Merge saved signal mailbox pending flag to maintain interlock
694 * semantics against system calls.
696 if (ucp->uc_mcontext.mc_xflags & PGEX_MAILBOX)
697 p->p_flag |= P_MAILBOX;
699 if (ucp->uc_mcontext.mc_onstack & 1)
700 lp->lwp_sigstk.ss_flags |= SS_ONSTACK;
702 lp->lwp_sigstk.ss_flags &= ~SS_ONSTACK;
704 lp->lwp_sigmask = ucp->uc_sigmask;
705 SIG_CANTMASK(lp->lwp_sigmask);
711 * Stack frame on entry to function. %eax will contain the function vector,
712 * %ecx will contain the function data. flags, ecx, and eax will have
713 * already been pushed on the stack.
724 sendupcall(struct vmupcall *vu, int morepending)
726 struct lwp *lp = curthread->td_lwp;
727 struct trapframe *regs;
728 struct upcall upcall;
729 struct upc_frame upc_frame;
733 * If we are a virtual kernel running an emulated user process
734 * context, switch back to the virtual kernel context before
735 * trying to post the signal.
737 if (lp->lwp_vkernel && lp->lwp_vkernel->ve) {
738 lp->lwp_md.md_regs->tf_trapno = 0;
739 vkernel_trap(lp, lp->lwp_md.md_regs);
743 * Get the upcall data structure
745 if (copyin(lp->lwp_upcall, &upcall, sizeof(upcall)) ||
746 copyin((char *)upcall.upc_uthread + upcall.upc_critoff, &crit_count, sizeof(int))
749 kprintf("bad upcall address\n");
754 * If the data structure is already marked pending or has a critical
755 * section count, mark the data structure as pending and return
756 * without doing an upcall. vu_pending is left set.
758 if (upcall.upc_pending || crit_count >= vu->vu_pending) {
759 if (upcall.upc_pending < vu->vu_pending) {
760 upcall.upc_pending = vu->vu_pending;
761 copyout(&upcall.upc_pending, &lp->lwp_upcall->upc_pending,
762 sizeof(upcall.upc_pending));
768 * We can run this upcall now, clear vu_pending.
770 * Bump our critical section count and set or clear the
771 * user pending flag depending on whether more upcalls are
772 * pending. The user will be responsible for calling
773 * upc_dispatch(-1) to process remaining upcalls.
776 upcall.upc_pending = morepending;
778 copyout(&upcall.upc_pending, &lp->lwp_upcall->upc_pending,
779 sizeof(upcall.upc_pending));
780 copyout(&crit_count, (char *)upcall.upc_uthread + upcall.upc_critoff,
784 * Construct a stack frame and issue the upcall
786 regs = lp->lwp_md.md_regs;
787 upc_frame.eax = regs->tf_eax;
788 upc_frame.ecx = regs->tf_ecx;
789 upc_frame.edx = regs->tf_edx;
790 upc_frame.flags = regs->tf_eflags;
791 upc_frame.oldip = regs->tf_eip;
792 if (copyout(&upc_frame, (void *)(regs->tf_esp - sizeof(upc_frame)),
793 sizeof(upc_frame)) != 0) {
794 kprintf("bad stack on upcall\n");
796 regs->tf_eax = (register_t)vu->vu_func;
797 regs->tf_ecx = (register_t)vu->vu_data;
798 regs->tf_edx = (register_t)lp->lwp_upcall;
799 regs->tf_eip = (register_t)vu->vu_ctx;
800 regs->tf_esp -= sizeof(upc_frame);
805 * fetchupcall occurs in the context of a system call, which means that
806 * we have to return EJUSTRETURN in order to prevent eax and edx from
807 * being overwritten by the syscall return value.
809 * if vu is not NULL we return the new context in %edx, the new data in %ecx,
810 * and the function pointer in %eax.
813 fetchupcall(struct vmupcall *vu, int morepending, void *rsp)
815 struct upc_frame upc_frame;
816 struct lwp *lp = curthread->td_lwp;
817 struct trapframe *regs;
819 struct upcall upcall;
822 regs = lp->lwp_md.md_regs;
824 error = copyout(&morepending, &lp->lwp_upcall->upc_pending, sizeof(int));
828 * This jumps us to the next ready context.
831 error = copyin(lp->lwp_upcall, &upcall, sizeof(upcall));
834 error = copyin((char *)upcall.upc_uthread + upcall.upc_critoff, &crit_count, sizeof(int));
837 error = copyout(&crit_count, (char *)upcall.upc_uthread + upcall.upc_critoff, sizeof(int));
838 regs->tf_eax = (register_t)vu->vu_func;
839 regs->tf_ecx = (register_t)vu->vu_data;
840 regs->tf_edx = (register_t)lp->lwp_upcall;
841 regs->tf_eip = (register_t)vu->vu_ctx;
842 regs->tf_esp = (register_t)rsp;
845 * This returns us to the originally interrupted code.
847 error = copyin(rsp, &upc_frame, sizeof(upc_frame));
848 regs->tf_eax = upc_frame.eax;
849 regs->tf_ecx = upc_frame.ecx;
850 regs->tf_edx = upc_frame.edx;
851 regs->tf_eflags = (regs->tf_eflags & ~PSL_USERCHANGE) |
852 (upc_frame.flags & PSL_USERCHANGE);
853 regs->tf_eip = upc_frame.oldip;
854 regs->tf_esp = (register_t)((char *)rsp + sizeof(upc_frame));
863 * Machine dependent boot() routine
865 * I haven't seen anything to put here yet
866 * Possibly some stuff might be grafted back here from boot()
874 * Shutdown the CPU as much as possible
880 __asm__ __volatile("hlt");
884 * cpu_idle() represents the idle LWKT. You cannot return from this function
885 * (unless you want to blow things up!). Instead we look for runnable threads
886 * and loop or halt as appropriate. Giant is not held on entry to the thread.
888 * The main loop is entered with a critical section held, we must release
889 * the critical section before doing anything else. lwkt_switch() will
890 * check for pending interrupts due to entering and exiting its own
893 * NOTE: On an SMP system we rely on a scheduler IPI to wake a HLTed cpu up.
894 * However, there are cases where the idlethread will be entered with
895 * the possibility that no IPI will occur and in such cases
896 * lwkt_switch() sets RQF_WAKEUP. We usually check
897 * RQF_IDLECHECK_WK_MASK.
899 * NOTE: cpu_idle_hlt again defaults to 2 (use ACPI sleep states). Set to
900 * 1 to just use hlt and for debugging purposes.
902 static int cpu_idle_hlt = 2;
903 static int cpu_idle_hltcnt;
904 static int cpu_idle_spincnt;
905 static u_int cpu_idle_repeat = 4;
906 SYSCTL_INT(_machdep, OID_AUTO, cpu_idle_hlt, CTLFLAG_RW,
907 &cpu_idle_hlt, 0, "Idle loop HLT enable");
908 SYSCTL_INT(_machdep, OID_AUTO, cpu_idle_hltcnt, CTLFLAG_RW,
909 &cpu_idle_hltcnt, 0, "Idle loop entry halts");
910 SYSCTL_INT(_machdep, OID_AUTO, cpu_idle_spincnt, CTLFLAG_RW,
911 &cpu_idle_spincnt, 0, "Idle loop entry spins");
912 SYSCTL_INT(_machdep, OID_AUTO, cpu_idle_repeat, CTLFLAG_RW,
913 &cpu_idle_repeat, 0, "Idle entries before acpi hlt");
916 cpu_idle_default_hook(void)
919 * We must guarentee that hlt is exactly the instruction
922 __asm __volatile("sti; hlt");
925 /* Other subsystems (e.g., ACPI) can hook this later. */
926 void (*cpu_idle_hook)(void) = cpu_idle_default_hook;
931 globaldata_t gd = mycpu;
932 struct thread *td __debugvar = gd->gd_curthread;
937 KKASSERT(td->td_critcount == 0);
940 * See if there are any LWKTs ready to go.
945 * When halting inside a cli we must check for reqflags
946 * races, particularly [re]schedule requests. Running
947 * splz() does the job.
950 * 0 Never halt, just spin
952 * 1 Always use HLT (or MONITOR/MWAIT if avail).
953 * This typically eats more power than the
956 * 2 Use HLT/MONITOR/MWAIT up to a point and then
957 * use the ACPI halt (default). This is a hybrid
958 * approach. See machdep.cpu_idle_repeat.
960 * 3 Always use the ACPI halt. This typically
961 * eats the least amount of power but the cpu
962 * will be slow waking up. Slows down e.g.
963 * compiles and other pipe/event oriented stuff.
966 * NOTE: Interrupts are enabled and we are not in a critical
969 * NOTE: Preemptions do not reset gd_idle_repeat. Also we
970 * don't bother capping gd_idle_repeat, it is ok if
973 ++gd->gd_idle_repeat;
974 reqflags = gd->gd_reqflags;
975 quick = (cpu_idle_hlt == 1) ||
977 gd->gd_idle_repeat < cpu_idle_repeat);
979 if (quick && (cpu_mi_feature & CPU_MI_MONITOR) &&
980 (reqflags & RQF_IDLECHECK_WK_MASK) == 0) {
981 cpu_mmw_pause_int(&gd->gd_reqflags, reqflags);
983 } else if (cpu_idle_hlt) {
984 __asm __volatile("cli");
986 if ((gd->gd_reqflags & RQF_IDLECHECK_WK_MASK) == 0) {
988 cpu_idle_default_hook();
992 __asm __volatile("sti");
996 __asm __volatile("sti");
1005 * This routine is called if a spinlock has been held through the
1006 * exponential backoff period and is seriously contested. On a real cpu
1010 cpu_spinlock_contested(void)
1018 * Clear registers on exec
1021 exec_setregs(u_long entry, u_long stack, u_long ps_strings)
1023 struct thread *td = curthread;
1024 struct lwp *lp = td->td_lwp;
1025 struct pcb *pcb = td->td_pcb;
1026 struct trapframe *regs = lp->lwp_md.md_regs;
1028 /* was i386_user_cleanup() in NetBSD */
1031 bzero((char *)regs, sizeof(struct trapframe));
1032 regs->tf_eip = entry;
1033 regs->tf_esp = stack;
1034 regs->tf_eflags = PSL_USER | (regs->tf_eflags & PSL_T);
1035 regs->tf_ss = _udatasel;
1036 regs->tf_ds = _udatasel;
1037 regs->tf_es = _udatasel;
1038 regs->tf_fs = _udatasel;
1039 regs->tf_gs = _udatasel;
1040 regs->tf_cs = _ucodesel;
1042 /* PS_STRINGS value for BSD/OS binaries. It is 0 for non-BSD/OS. */
1043 regs->tf_ebx = ps_strings;
1046 * Reset the hardware debug registers if they were in use.
1047 * They won't have any meaning for the newly exec'd process.
1049 if (pcb->pcb_flags & PCB_DBREGS) {
1056 if (pcb == td->td_pcb) {
1058 * Clear the debug registers on the running
1059 * CPU, otherwise they will end up affecting
1060 * the next process we switch to.
1064 pcb->pcb_flags &= ~PCB_DBREGS;
1068 * Initialize the math emulator (if any) for the current process.
1069 * Actually, just clear the bit that says that the emulator has
1070 * been initialized. Initialization is delayed until the process
1071 * traps to the emulator (if it is done at all) mainly because
1072 * emulators don't provide an entry point for initialization.
1074 pcb->pcb_flags &= ~FP_SOFTFP;
1077 * note: do not set CR0_TS here. npxinit() must do it after clearing
1078 * gd_npxthread. Otherwise a preemptive interrupt thread may panic
1082 load_cr0(rcr0() | CR0_MP);
1085 /* Initialize the npx (if any) for the current process. */
1086 npxinit(__INITIAL_NPXCW__);
1091 * note: linux emulator needs edx to be 0x0 on entry, which is
1092 * handled in execve simply by setting the 64 bit syscall
1093 * return value to 0.
1103 cr0 |= CR0_NE; /* Done by npxinit() */
1104 cr0 |= CR0_MP | CR0_TS; /* Done at every execve() too. */
1105 cr0 |= CR0_WP | CR0_AM;
1111 sysctl_machdep_adjkerntz(SYSCTL_HANDLER_ARGS)
1114 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2,
1116 if (!error && req->newptr)
1121 SYSCTL_PROC(_machdep, CPU_ADJKERNTZ, adjkerntz, CTLTYPE_INT|CTLFLAG_RW,
1122 &adjkerntz, 0, sysctl_machdep_adjkerntz, "I", "");
1124 SYSCTL_INT(_machdep, CPU_DISRTCSET, disable_rtc_set,
1125 CTLFLAG_RW, &disable_rtc_set, 0, "");
1127 SYSCTL_STRUCT(_machdep, CPU_BOOTINFO, bootinfo,
1128 CTLFLAG_RD, &bootinfo, bootinfo, "");
1130 SYSCTL_INT(_machdep, CPU_WALLCLOCK, wall_cmos_clock,
1131 CTLFLAG_RW, &wall_cmos_clock, 0, "");
1133 extern u_long bootdev; /* not a cdev_t - encoding is different */
1134 SYSCTL_ULONG(_machdep, OID_AUTO, guessed_bootdev,
1135 CTLFLAG_RD, &bootdev, 0, "Boot device (not in cdev_t format)");
1138 * Initialize 386 and configure to run kernel
1142 * Initialize segments & interrupt table
1146 union descriptor gdt[NGDT * MAXCPU]; /* global descriptor table */
1147 static struct gate_descriptor idt0[NIDT];
1148 struct gate_descriptor *idt = &idt0[0]; /* interrupt descriptor table */
1149 union descriptor ldt[NLDT]; /* local descriptor table */
1151 /* table descriptors - used to load tables by cpu */
1152 struct region_descriptor r_gdt, r_idt;
1154 #if defined(I586_CPU) && !defined(NO_F00F_HACK)
1155 extern int has_f00f_bug;
1158 static struct i386tss dblfault_tss;
1159 static char dblfault_stack[PAGE_SIZE];
1161 extern struct user *proc0paddr;
1164 /* software prototypes -- in more palatable form */
1165 struct soft_segment_descriptor gdt_segs[] = {
1166 /* GNULL_SEL 0 Null Descriptor */
1167 { 0x0, /* segment base address */
1169 0, /* segment type */
1170 0, /* segment descriptor priority level */
1171 0, /* segment descriptor present */
1173 0, /* default 32 vs 16 bit size */
1174 0 /* limit granularity (byte/page units)*/ },
1175 /* GCODE_SEL 1 Code Descriptor for kernel */
1176 { 0x0, /* segment base address */
1177 0xfffff, /* length - all address space */
1178 SDT_MEMERA, /* segment type */
1179 0, /* segment descriptor priority level */
1180 1, /* segment descriptor present */
1182 1, /* default 32 vs 16 bit size */
1183 1 /* limit granularity (byte/page units)*/ },
1184 /* GDATA_SEL 2 Data Descriptor for kernel */
1185 { 0x0, /* segment base address */
1186 0xfffff, /* length - all address space */
1187 SDT_MEMRWA, /* segment type */
1188 0, /* segment descriptor priority level */
1189 1, /* segment descriptor present */
1191 1, /* default 32 vs 16 bit size */
1192 1 /* limit granularity (byte/page units)*/ },
1193 /* GPRIV_SEL 3 SMP Per-Processor Private Data Descriptor */
1194 { 0x0, /* segment base address */
1195 0xfffff, /* length - all address space */
1196 SDT_MEMRWA, /* segment type */
1197 0, /* segment descriptor priority level */
1198 1, /* segment descriptor present */
1200 1, /* default 32 vs 16 bit size */
1201 1 /* limit granularity (byte/page units)*/ },
1202 /* GPROC0_SEL 4 Proc 0 Tss Descriptor */
1204 0x0, /* segment base address */
1205 sizeof(struct i386tss)-1,/* length - all address space */
1206 SDT_SYS386TSS, /* segment type */
1207 0, /* segment descriptor priority level */
1208 1, /* segment descriptor present */
1210 0, /* unused - default 32 vs 16 bit size */
1211 0 /* limit granularity (byte/page units)*/ },
1212 /* GLDT_SEL 5 LDT Descriptor */
1213 { (int) ldt, /* segment base address */
1214 sizeof(ldt)-1, /* length - all address space */
1215 SDT_SYSLDT, /* segment type */
1216 SEL_UPL, /* segment descriptor priority level */
1217 1, /* segment descriptor present */
1219 0, /* unused - default 32 vs 16 bit size */
1220 0 /* limit granularity (byte/page units)*/ },
1221 /* GUSERLDT_SEL 6 User LDT Descriptor per process */
1222 { (int) ldt, /* segment base address */
1223 (512 * sizeof(union descriptor)-1), /* length */
1224 SDT_SYSLDT, /* segment type */
1225 0, /* segment descriptor priority level */
1226 1, /* segment descriptor present */
1228 0, /* unused - default 32 vs 16 bit size */
1229 0 /* limit granularity (byte/page units)*/ },
1230 /* GTGATE_SEL 7 Null Descriptor - Placeholder */
1231 { 0x0, /* segment base address */
1232 0x0, /* length - all address space */
1233 0, /* segment type */
1234 0, /* segment descriptor priority level */
1235 0, /* segment descriptor present */
1237 0, /* default 32 vs 16 bit size */
1238 0 /* limit granularity (byte/page units)*/ },
1239 /* GBIOSLOWMEM_SEL 8 BIOS access to realmode segment 0x40, must be #8 in GDT */
1240 { 0x400, /* segment base address */
1241 0xfffff, /* length */
1242 SDT_MEMRWA, /* segment type */
1243 0, /* segment descriptor priority level */
1244 1, /* segment descriptor present */
1246 1, /* default 32 vs 16 bit size */
1247 1 /* limit granularity (byte/page units)*/ },
1248 /* GPANIC_SEL 9 Panic Tss Descriptor */
1249 { (int) &dblfault_tss, /* segment base address */
1250 sizeof(struct i386tss)-1,/* length - all address space */
1251 SDT_SYS386TSS, /* segment type */
1252 0, /* segment descriptor priority level */
1253 1, /* segment descriptor present */
1255 0, /* unused - default 32 vs 16 bit size */
1256 0 /* limit granularity (byte/page units)*/ },
1257 /* GBIOSCODE32_SEL 10 BIOS 32-bit interface (32bit Code) */
1258 { 0, /* segment base address (overwritten) */
1259 0xfffff, /* length */
1260 SDT_MEMERA, /* segment type */
1261 0, /* segment descriptor priority level */
1262 1, /* segment descriptor present */
1264 0, /* default 32 vs 16 bit size */
1265 1 /* limit granularity (byte/page units)*/ },
1266 /* GBIOSCODE16_SEL 11 BIOS 32-bit interface (16bit Code) */
1267 { 0, /* segment base address (overwritten) */
1268 0xfffff, /* length */
1269 SDT_MEMERA, /* segment type */
1270 0, /* segment descriptor priority level */
1271 1, /* segment descriptor present */
1273 0, /* default 32 vs 16 bit size */
1274 1 /* limit granularity (byte/page units)*/ },
1275 /* GBIOSDATA_SEL 12 BIOS 32-bit interface (Data) */
1276 { 0, /* segment base address (overwritten) */
1277 0xfffff, /* length */
1278 SDT_MEMRWA, /* segment type */
1279 0, /* segment descriptor priority level */
1280 1, /* segment descriptor present */
1282 1, /* default 32 vs 16 bit size */
1283 1 /* limit granularity (byte/page units)*/ },
1284 /* GBIOSUTIL_SEL 13 BIOS 16-bit interface (Utility) */
1285 { 0, /* segment base address (overwritten) */
1286 0xfffff, /* length */
1287 SDT_MEMRWA, /* segment type */
1288 0, /* segment descriptor priority level */
1289 1, /* segment descriptor present */
1291 0, /* default 32 vs 16 bit size */
1292 1 /* limit granularity (byte/page units)*/ },
1293 /* GBIOSARGS_SEL 14 BIOS 16-bit interface (Arguments) */
1294 { 0, /* segment base address (overwritten) */
1295 0xfffff, /* length */
1296 SDT_MEMRWA, /* segment type */
1297 0, /* segment descriptor priority level */
1298 1, /* segment descriptor present */
1300 0, /* default 32 vs 16 bit size */
1301 1 /* limit granularity (byte/page units)*/ },
1302 /* GTLS_START 15 TLS */
1303 { 0x0, /* segment base address */
1305 0, /* segment type */
1306 0, /* segment descriptor priority level */
1307 0, /* segment descriptor present */
1309 0, /* default 32 vs 16 bit size */
1310 0 /* limit granularity (byte/page units)*/ },
1311 /* GTLS_START+1 16 TLS */
1312 { 0x0, /* segment base address */
1314 0, /* segment type */
1315 0, /* segment descriptor priority level */
1316 0, /* segment descriptor present */
1318 0, /* default 32 vs 16 bit size */
1319 0 /* limit granularity (byte/page units)*/ },
1320 /* GTLS_END 17 TLS */
1321 { 0x0, /* segment base address */
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)*/ },
1331 static struct soft_segment_descriptor ldt_segs[] = {
1332 /* Null Descriptor - overwritten by call gate */
1333 { 0x0, /* segment base address */
1334 0x0, /* length - all address space */
1335 0, /* segment type */
1336 0, /* segment descriptor priority level */
1337 0, /* segment descriptor present */
1339 0, /* default 32 vs 16 bit size */
1340 0 /* limit granularity (byte/page units)*/ },
1341 /* Null Descriptor - overwritten by call gate */
1342 { 0x0, /* segment base address */
1343 0x0, /* length - all address space */
1344 0, /* segment type */
1345 0, /* segment descriptor priority level */
1346 0, /* segment descriptor present */
1348 0, /* default 32 vs 16 bit size */
1349 0 /* limit granularity (byte/page units)*/ },
1350 /* Null Descriptor - overwritten by call gate */
1351 { 0x0, /* segment base address */
1352 0x0, /* length - all address space */
1353 0, /* segment type */
1354 0, /* segment descriptor priority level */
1355 0, /* segment descriptor present */
1357 0, /* default 32 vs 16 bit size */
1358 0 /* limit granularity (byte/page units)*/ },
1359 /* Code Descriptor for user */
1360 { 0x0, /* segment base address */
1361 0xfffff, /* length - all address space */
1362 SDT_MEMERA, /* segment type */
1363 SEL_UPL, /* segment descriptor priority level */
1364 1, /* segment descriptor present */
1366 1, /* default 32 vs 16 bit size */
1367 1 /* limit granularity (byte/page units)*/ },
1368 /* Null Descriptor - overwritten by call gate */
1369 { 0x0, /* segment base address */
1370 0x0, /* length - all address space */
1371 0, /* segment type */
1372 0, /* segment descriptor priority level */
1373 0, /* segment descriptor present */
1375 0, /* default 32 vs 16 bit size */
1376 0 /* limit granularity (byte/page units)*/ },
1377 /* Data Descriptor for user */
1378 { 0x0, /* segment base address */
1379 0xfffff, /* length - all address space */
1380 SDT_MEMRWA, /* segment type */
1381 SEL_UPL, /* segment descriptor priority level */
1382 1, /* segment descriptor present */
1384 1, /* default 32 vs 16 bit size */
1385 1 /* limit granularity (byte/page units)*/ },
1389 setidt(int idx, inthand_t *func, int typ, int dpl, int selec)
1391 struct gate_descriptor *ip;
1394 ip->gd_looffset = (int)func;
1395 ip->gd_selector = selec;
1401 ip->gd_hioffset = ((int)func)>>16 ;
1404 #define IDTVEC(name) __CONCAT(X,name)
1407 IDTVEC(div), IDTVEC(dbg), IDTVEC(nmi), IDTVEC(bpt), IDTVEC(ofl),
1408 IDTVEC(bnd), IDTVEC(ill), IDTVEC(dna), IDTVEC(fpusegm),
1409 IDTVEC(tss), IDTVEC(missing), IDTVEC(stk), IDTVEC(prot),
1410 IDTVEC(page), IDTVEC(mchk), IDTVEC(fpu), IDTVEC(align),
1411 IDTVEC(xmm), IDTVEC(syscall),
1414 IDTVEC(int0x80_syscall);
1416 #ifdef DEBUG_INTERRUPTS
1417 extern inthand_t *Xrsvdary[256];
1421 sdtossd(struct segment_descriptor *sd, struct soft_segment_descriptor *ssd)
1423 ssd->ssd_base = (sd->sd_hibase << 24) | sd->sd_lobase;
1424 ssd->ssd_limit = (sd->sd_hilimit << 16) | sd->sd_lolimit;
1425 ssd->ssd_type = sd->sd_type;
1426 ssd->ssd_dpl = sd->sd_dpl;
1427 ssd->ssd_p = sd->sd_p;
1428 ssd->ssd_def32 = sd->sd_def32;
1429 ssd->ssd_gran = sd->sd_gran;
1433 * Populate the (physmap) array with base/bound pairs describing the
1434 * available physical memory in the system, then test this memory and
1435 * build the phys_avail array describing the actually-available memory.
1437 * If we cannot accurately determine the physical memory map, then use
1438 * value from the 0xE801 call, and failing that, the RTC.
1440 * Total memory size may be set by the kernel environment variable
1441 * hw.physmem or the compile-time define MAXMEM.
1444 getmemsize(int first)
1446 int i, physmap_idx, pa_indx, da_indx;
1448 u_int basemem, extmem;
1449 struct vm86frame vmf;
1450 struct vm86context vmc;
1452 vm_offset_t physmap[PHYSMAP_ENTRIES*2];
1460 quad_t dcons_addr, dcons_size;
1462 bzero(&vmf, sizeof(struct vm86frame));
1463 bzero(physmap, sizeof(physmap));
1467 * Some newer BIOSes has broken INT 12H implementation which cause
1468 * kernel panic immediately. In this case, we need to scan SMAP
1469 * with INT 15:E820 first, then determine base memory size.
1472 TUNABLE_INT_FETCH("hw.hasbrokenint12", &hasbrokenint12);
1473 if (hasbrokenint12) {
1478 * Perform "base memory" related probes & setup. If we get a crazy
1479 * value give the bios some scribble space just in case.
1481 vm86_intcall(0x12, &vmf);
1482 basemem = vmf.vmf_ax;
1483 if (basemem > 640) {
1484 kprintf("Preposterous BIOS basemem of %uK, "
1485 "truncating to < 640K\n", basemem);
1490 * XXX if biosbasemem is now < 640, there is a `hole'
1491 * between the end of base memory and the start of
1492 * ISA memory. The hole may be empty or it may
1493 * contain BIOS code or data. Map it read/write so
1494 * that the BIOS can write to it. (Memory from 0 to
1495 * the physical end of the kernel is mapped read-only
1496 * to begin with and then parts of it are remapped.
1497 * The parts that aren't remapped form holes that
1498 * remain read-only and are unused by the kernel.
1499 * The base memory area is below the physical end of
1500 * the kernel and right now forms a read-only hole.
1501 * The part of it from PAGE_SIZE to
1502 * (trunc_page(biosbasemem * 1024) - 1) will be
1503 * remapped and used by the kernel later.)
1505 * This code is similar to the code used in
1506 * pmap_mapdev, but since no memory needs to be
1507 * allocated we simply change the mapping.
1509 for (pa = trunc_page(basemem * 1024);
1510 pa < ISA_HOLE_START; pa += PAGE_SIZE) {
1511 pte = vtopte(pa + KERNBASE);
1512 *pte = pa | PG_RW | PG_V;
1516 * if basemem != 640, map pages r/w into vm86 page table so
1517 * that the bios can scribble on it.
1520 for (i = basemem / 4; i < 160; i++)
1521 pte[i] = (i << PAGE_SHIFT) | PG_V | PG_RW | PG_U;
1525 * map page 1 R/W into the kernel page table so we can use it
1526 * as a buffer. The kernel will unmap this page later.
1528 pte = vtopte(KERNBASE + (1 << PAGE_SHIFT));
1529 *pte = (1 << PAGE_SHIFT) | PG_RW | PG_V;
1532 * get memory map with INT 15:E820
1534 #define SMAPSIZ sizeof(*smap)
1535 #define SMAP_SIG 0x534D4150 /* 'SMAP' */
1538 smap = (void *)vm86_addpage(&vmc, 1, KERNBASE + (1 << PAGE_SHIFT));
1539 vm86_getptr(&vmc, (vm_offset_t)smap, &vmf.vmf_es, &vmf.vmf_di);
1544 vmf.vmf_eax = 0xE820;
1545 vmf.vmf_edx = SMAP_SIG;
1546 vmf.vmf_ecx = SMAPSIZ;
1547 i = vm86_datacall(0x15, &vmf, &vmc);
1548 if (i || vmf.vmf_eax != SMAP_SIG)
1550 if (boothowto & RB_VERBOSE)
1551 kprintf("SMAP type=%02x base=%08x %08x len=%08x %08x\n",
1553 *(u_int32_t *)((char *)&smap->base + 4),
1554 (u_int32_t)smap->base,
1555 *(u_int32_t *)((char *)&smap->length + 4),
1556 (u_int32_t)smap->length);
1558 if (smap->type != 0x01)
1561 if (smap->length == 0)
1564 Realmem += smap->length;
1566 if (smap->base >= 0xffffffffLLU) {
1567 kprintf("%ju MB of memory above 4GB ignored\n",
1568 (uintmax_t)(smap->length / 1024 / 1024));
1572 for (i = 0; i <= physmap_idx; i += 2) {
1573 if (smap->base < physmap[i + 1]) {
1574 if (boothowto & RB_VERBOSE) {
1575 kprintf("Overlapping or non-montonic "
1576 "memory region, ignoring "
1579 Realmem -= smap->length;
1584 if (smap->base == physmap[physmap_idx + 1]) {
1585 physmap[physmap_idx + 1] += smap->length;
1590 if (physmap_idx == PHYSMAP_ENTRIES*2) {
1591 kprintf("Too many segments in the physical "
1592 "address map, giving up\n");
1595 physmap[physmap_idx] = smap->base;
1596 physmap[physmap_idx + 1] = smap->base + smap->length;
1598 ; /* fix GCC3.x warning */
1599 } while (vmf.vmf_ebx != 0);
1602 * Perform "base memory" related probes & setup based on SMAP
1605 for (i = 0; i <= physmap_idx; i += 2) {
1606 if (physmap[i] == 0x00000000) {
1607 basemem = physmap[i + 1] / 1024;
1616 if (basemem > 640) {
1617 kprintf("Preposterous BIOS basemem of %uK, "
1618 "truncating to 640K\n", basemem);
1622 for (pa = trunc_page(basemem * 1024);
1623 pa < ISA_HOLE_START; pa += PAGE_SIZE) {
1624 pte = vtopte(pa + KERNBASE);
1625 *pte = pa | PG_RW | PG_V;
1629 for (i = basemem / 4; i < 160; i++)
1630 pte[i] = (i << PAGE_SHIFT) | PG_V | PG_RW | PG_U;
1633 if (physmap[1] != 0)
1637 * If we failed above, try memory map with INT 15:E801
1639 vmf.vmf_ax = 0xE801;
1640 if (vm86_intcall(0x15, &vmf) == 0) {
1641 extmem = vmf.vmf_cx + vmf.vmf_dx * 64;
1645 vm86_intcall(0x15, &vmf);
1646 extmem = vmf.vmf_ax;
1649 * Prefer the RTC value for extended memory.
1651 extmem = rtcin(RTC_EXTLO) + (rtcin(RTC_EXTHI) << 8);
1656 * Special hack for chipsets that still remap the 384k hole when
1657 * there's 16MB of memory - this really confuses people that
1658 * are trying to use bus mastering ISA controllers with the
1659 * "16MB limit"; they only have 16MB, but the remapping puts
1660 * them beyond the limit.
1662 * If extended memory is between 15-16MB (16-17MB phys address range),
1665 if ((extmem > 15 * 1024) && (extmem < 16 * 1024))
1669 physmap[1] = basemem * 1024;
1671 physmap[physmap_idx] = 0x100000;
1672 physmap[physmap_idx + 1] = physmap[physmap_idx] + extmem * 1024;
1676 * Now, physmap contains a map of physical memory.
1679 base_memory = physmap[1];
1681 /* make hole for AP bootstrap code YYY */
1682 physmap[1] = mp_bootaddress(base_memory);
1685 /* Save EBDA address, if any */
1686 ebda_addr = (u_long)(*(u_short *)(KERNBASE + 0x40e));
1690 * Maxmem isn't the "maximum memory", it's one larger than the
1691 * highest page of the physical address space. It should be
1692 * called something like "Maxphyspage". We may adjust this
1693 * based on ``hw.physmem'' and the results of the memory test.
1695 Maxmem = atop(physmap[physmap_idx + 1]);
1698 Maxmem = MAXMEM / 4;
1701 if (kgetenv_quad("hw.physmem", &maxmem))
1702 Maxmem = atop(maxmem);
1704 if (atop(physmap[physmap_idx + 1]) != Maxmem &&
1705 (boothowto & RB_VERBOSE))
1706 kprintf("Physical memory use set to %lluK\n", Maxmem * 4);
1709 * If Maxmem has been increased beyond what the system has detected,
1710 * extend the last memory segment to the new limit.
1712 if (atop(physmap[physmap_idx + 1]) < Maxmem)
1713 physmap[physmap_idx + 1] = ptoa(Maxmem);
1715 /* call pmap initialization to make new kernel address space */
1716 pmap_bootstrap(first, 0);
1719 * Size up each available chunk of physical memory.
1721 physmap[0] = PAGE_SIZE; /* mask off page 0 */
1724 phys_avail[pa_indx++] = physmap[0];
1725 phys_avail[pa_indx] = physmap[0];
1726 dump_avail[da_indx] = physmap[0];
1731 * Get dcons buffer address
1733 if (kgetenv_quad("dcons.addr", &dcons_addr) == 0 ||
1734 kgetenv_quad("dcons.size", &dcons_size) == 0)
1738 * physmap is in bytes, so when converting to page boundaries,
1739 * round up the start address and round down the end address.
1741 for (i = 0; i <= physmap_idx; i += 2) {
1745 if (physmap[i + 1] < end)
1746 end = trunc_page(physmap[i + 1]);
1747 for (pa = round_page(physmap[i]); pa < end; pa += PAGE_SIZE) {
1748 int tmp, page_bad, full;
1752 int *ptr = (int *)CADDR1;
1757 * block out kernel memory as not available.
1759 if (pa >= 0x100000 && pa < first)
1763 * block out dcons buffer
1766 && pa >= trunc_page(dcons_addr)
1767 && pa < dcons_addr + dcons_size)
1773 * map page into kernel: valid, read/write,non-cacheable
1775 *pte = pa | PG_V | PG_RW | PG_N;
1780 * Test for alternating 1's and 0's
1782 *(volatile int *)ptr = 0xaaaaaaaa;
1783 if (*(volatile int *)ptr != 0xaaaaaaaa) {
1787 * Test for alternating 0's and 1's
1789 *(volatile int *)ptr = 0x55555555;
1790 if (*(volatile int *)ptr != 0x55555555) {
1796 *(volatile int *)ptr = 0xffffffff;
1797 if (*(volatile int *)ptr != 0xffffffff) {
1803 *(volatile int *)ptr = 0x0;
1804 if (*(volatile int *)ptr != 0x0) {
1808 * Restore original value.
1813 * Adjust array of valid/good pages.
1815 if (page_bad == TRUE) {
1819 * If this good page is a continuation of the
1820 * previous set of good pages, then just increase
1821 * the end pointer. Otherwise start a new chunk.
1822 * Note that "end" points one higher than end,
1823 * making the range >= start and < end.
1824 * If we're also doing a speculative memory
1825 * test and we at or past the end, bump up Maxmem
1826 * so that we keep going. The first bad page
1827 * will terminate the loop.
1829 if (phys_avail[pa_indx] == pa) {
1830 phys_avail[pa_indx] += PAGE_SIZE;
1833 if (pa_indx >= PHYSMAP_ENTRIES*2) {
1834 kprintf("Too many holes in the physical address space, giving up\n");
1839 phys_avail[pa_indx++] = pa; /* start */
1840 phys_avail[pa_indx] = pa + PAGE_SIZE; /* end */
1844 if (dump_avail[da_indx] == pa) {
1845 dump_avail[da_indx] += PAGE_SIZE;
1848 if (da_indx >= PHYSMAP_ENTRIES*2) {
1852 dump_avail[da_indx++] = pa; /* start */
1853 dump_avail[da_indx] = pa + PAGE_SIZE; /* end */
1866 * The last chunk must contain at least one page plus the message
1867 * buffer to avoid complicating other code (message buffer address
1868 * calculation, etc.).
1870 while (phys_avail[pa_indx - 1] + PAGE_SIZE +
1871 round_page(MSGBUF_SIZE) >= phys_avail[pa_indx]) {
1872 physmem -= atop(phys_avail[pa_indx] - phys_avail[pa_indx - 1]);
1873 phys_avail[pa_indx--] = 0;
1874 phys_avail[pa_indx--] = 0;
1877 Maxmem = atop(phys_avail[pa_indx]);
1879 /* Trim off space for the message buffer. */
1880 phys_avail[pa_indx] -= round_page(MSGBUF_SIZE);
1882 avail_end = phys_avail[pa_indx];
1885 struct machintr_abi MachIntrABI;
1896 * 7 Device Not Available (x87)
1898 * 9 Coprocessor Segment overrun (unsupported, reserved)
1900 * 11 Segment not present
1902 * 13 General Protection
1905 * 16 x87 FP Exception pending
1906 * 17 Alignment Check
1908 * 19 SIMD floating point
1910 * 32-255 INTn/external sources
1915 struct gate_descriptor *gdp;
1916 int gsel_tss, metadata_missing, off, x;
1917 struct mdglobaldata *gd;
1920 * Prevent lowering of the ipl if we call tsleep() early.
1922 gd = &CPU_prvspace[0].mdglobaldata;
1923 bzero(gd, sizeof(*gd));
1925 gd->mi.gd_curthread = &thread0;
1926 thread0.td_gd = &gd->mi;
1928 atdevbase = ISA_HOLE_START + KERNBASE;
1930 metadata_missing = 0;
1931 if (bootinfo.bi_modulep) {
1932 preload_metadata = (caddr_t)bootinfo.bi_modulep + KERNBASE;
1933 preload_bootstrap_relocate(KERNBASE);
1935 metadata_missing = 1;
1937 if (bootinfo.bi_envp)
1938 kern_envp = (caddr_t)bootinfo.bi_envp + KERNBASE;
1940 if (boothowto & RB_VERBOSE)
1944 * Default MachIntrABI to ICU
1946 MachIntrABI = MachIntrABI_ICU;
1948 TUNABLE_INT_FETCH("hw.apic_io_enable", &ioapic_enable); /* for compat */
1949 TUNABLE_INT_FETCH("hw.ioapic_enable", &ioapic_enable);
1950 TUNABLE_INT_FETCH("hw.lapic_enable", &lapic_enable);
1954 * start with one cpu. Note: with one cpu, ncpus2_shift, ncpus2_mask,
1955 * and ncpus_fit_mask remain 0.
1960 /* Init basic tunables, hz etc */
1964 * make gdt memory segments, the code segment goes up to end of the
1965 * page with etext in it, the data segment goes to the end of
1969 * XXX text protection is temporarily (?) disabled. The limit was
1970 * i386_btop(round_page(etext)) - 1.
1972 gdt_segs[GCODE_SEL].ssd_limit = atop(0 - 1);
1973 gdt_segs[GDATA_SEL].ssd_limit = atop(0 - 1);
1975 gdt_segs[GPRIV_SEL].ssd_limit =
1976 atop(sizeof(struct privatespace) - 1);
1977 gdt_segs[GPRIV_SEL].ssd_base = (int) &CPU_prvspace[0];
1978 gdt_segs[GPROC0_SEL].ssd_base =
1979 (int) &CPU_prvspace[0].mdglobaldata.gd_common_tss;
1981 gd->mi.gd_prvspace = &CPU_prvspace[0];
1984 * Note: on both UP and SMP curthread must be set non-NULL
1985 * early in the boot sequence because the system assumes
1986 * that 'curthread' is never NULL.
1989 for (x = 0; x < NGDT; x++) {
1991 /* avoid overwriting db entries with APM ones */
1992 if (x >= GAPMCODE32_SEL && x <= GAPMDATA_SEL)
1995 ssdtosd(&gdt_segs[x], &gdt[x].sd);
1998 r_gdt.rd_limit = NGDT * sizeof(gdt[0]) - 1;
1999 r_gdt.rd_base = (int) gdt;
2002 mi_gdinit(&gd->mi, 0);
2004 mi_proc0init(&gd->mi, proc0paddr);
2005 safepri = TDPRI_MAX;
2007 /* make ldt memory segments */
2009 * XXX - VM_MAX_USER_ADDRESS is an end address, not a max. And it
2010 * should be spelled ...MAX_USER...
2012 ldt_segs[LUCODE_SEL].ssd_limit = atop(VM_MAX_USER_ADDRESS - 1);
2013 ldt_segs[LUDATA_SEL].ssd_limit = atop(VM_MAX_USER_ADDRESS - 1);
2014 for (x = 0; x < sizeof ldt_segs / sizeof ldt_segs[0]; x++)
2015 ssdtosd(&ldt_segs[x], &ldt[x].sd);
2017 _default_ldt = GSEL(GLDT_SEL, SEL_KPL);
2019 gd->gd_currentldt = _default_ldt;
2020 /* spinlocks and the BGL */
2024 * Setup the hardware exception table. Most exceptions use
2025 * SDT_SYS386TGT, known as a 'trap gate'. Trap gates leave
2026 * interrupts enabled. VM page faults use SDT_SYS386IGT, known as
2027 * an 'interrupt trap gate', which disables interrupts on entry,
2028 * in order to be able to poll the appropriate CRn register to
2029 * determine the fault address.
2031 for (x = 0; x < NIDT; x++) {
2032 #ifdef DEBUG_INTERRUPTS
2033 setidt(x, Xrsvdary[x], SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
2035 setidt(x, &IDTVEC(rsvd0), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
2038 setidt(0, &IDTVEC(div), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
2039 setidt(1, &IDTVEC(dbg), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
2040 setidt(2, &IDTVEC(nmi), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
2041 setidt(3, &IDTVEC(bpt), SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL));
2042 setidt(4, &IDTVEC(ofl), SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL));
2043 setidt(5, &IDTVEC(bnd), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
2044 setidt(6, &IDTVEC(ill), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
2045 setidt(7, &IDTVEC(dna), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
2046 setidt(8, 0, SDT_SYSTASKGT, SEL_KPL, GSEL(GPANIC_SEL, SEL_KPL));
2047 setidt(9, &IDTVEC(fpusegm), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
2048 setidt(10, &IDTVEC(tss), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
2049 setidt(11, &IDTVEC(missing), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
2050 setidt(12, &IDTVEC(stk), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
2051 setidt(13, &IDTVEC(prot), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
2052 setidt(14, &IDTVEC(page), SDT_SYS386IGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
2053 setidt(15, &IDTVEC(rsvd0), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
2054 setidt(16, &IDTVEC(fpu), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
2055 setidt(17, &IDTVEC(align), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
2056 setidt(18, &IDTVEC(mchk), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
2057 setidt(19, &IDTVEC(xmm), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
2058 setidt(0x80, &IDTVEC(int0x80_syscall),
2059 SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL));
2061 r_idt.rd_limit = sizeof(idt0) - 1;
2062 r_idt.rd_base = (int) idt;
2066 * Initialize the console before we print anything out.
2070 if (metadata_missing)
2071 kprintf("WARNING: loader(8) metadata is missing!\n");
2080 * Initialize IRQ mapping
2083 * SHOULD be after elcr_probe()
2085 MachIntrABI_ICU.initmap();
2087 MachIntrABI_IOAPIC.initmap();
2092 if (boothowto & RB_KDB)
2093 Debugger("Boot flags requested debugger");
2096 finishidentcpu(); /* Final stage of CPU initialization */
2097 setidt(6, &IDTVEC(ill), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
2098 setidt(13, &IDTVEC(prot), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
2099 initializecpu(); /* Initialize CPU registers */
2102 * make an initial tss so cpu can get interrupt stack on syscall!
2103 * The 16 bytes is to save room for a VM86 context.
2105 gd->gd_common_tss.tss_esp0 = (int) thread0.td_pcb - 16;
2106 gd->gd_common_tss.tss_ss0 = GSEL(GDATA_SEL, SEL_KPL) ;
2107 gsel_tss = GSEL(GPROC0_SEL, SEL_KPL);
2108 gd->gd_tss_gdt = &gdt[GPROC0_SEL].sd;
2109 gd->gd_common_tssd = *gd->gd_tss_gdt;
2110 gd->gd_common_tss.tss_ioopt = (sizeof gd->gd_common_tss) << 16;
2113 dblfault_tss.tss_esp = dblfault_tss.tss_esp0 = dblfault_tss.tss_esp1 =
2114 dblfault_tss.tss_esp2 = (int) &dblfault_stack[sizeof(dblfault_stack)];
2115 dblfault_tss.tss_ss = dblfault_tss.tss_ss0 = dblfault_tss.tss_ss1 =
2116 dblfault_tss.tss_ss2 = GSEL(GDATA_SEL, SEL_KPL);
2117 dblfault_tss.tss_cr3 = (int)IdlePTD;
2118 dblfault_tss.tss_eip = (int) dblfault_handler;
2119 dblfault_tss.tss_eflags = PSL_KERNEL;
2120 dblfault_tss.tss_ds = dblfault_tss.tss_es =
2121 dblfault_tss.tss_gs = GSEL(GDATA_SEL, SEL_KPL);
2122 dblfault_tss.tss_fs = GSEL(GPRIV_SEL, SEL_KPL);
2123 dblfault_tss.tss_cs = GSEL(GCODE_SEL, SEL_KPL);
2124 dblfault_tss.tss_ldt = GSEL(GLDT_SEL, SEL_KPL);
2128 init_param2(physmem);
2130 /* now running on new page tables, configured,and u/iom is accessible */
2132 /* Map the message buffer. */
2133 for (off = 0; off < round_page(MSGBUF_SIZE); off += PAGE_SIZE)
2134 pmap_kenter((vm_offset_t)msgbufp + off, avail_end + off);
2136 msgbufinit(msgbufp, MSGBUF_SIZE);
2138 /* make a call gate to reenter kernel with */
2139 gdp = &ldt[LSYS5CALLS_SEL].gd;
2141 x = (int) &IDTVEC(syscall);
2142 gdp->gd_looffset = x++;
2143 gdp->gd_selector = GSEL(GCODE_SEL,SEL_KPL);
2145 gdp->gd_type = SDT_SYS386CGT;
2146 gdp->gd_dpl = SEL_UPL;
2148 gdp->gd_hioffset = ((int) &IDTVEC(syscall)) >>16;
2150 /* XXX does this work? */
2151 ldt[LBSDICALLS_SEL] = ldt[LSYS5CALLS_SEL];
2152 ldt[LSOL26CALLS_SEL] = ldt[LSYS5CALLS_SEL];
2154 /* transfer to user mode */
2156 _ucodesel = LSEL(LUCODE_SEL, SEL_UPL);
2157 _udatasel = LSEL(LUDATA_SEL, SEL_UPL);
2159 /* setup proc 0's pcb */
2160 thread0.td_pcb->pcb_flags = 0;
2161 thread0.td_pcb->pcb_cr3 = (int)IdlePTD; /* should already be setup */
2162 thread0.td_pcb->pcb_ext = 0;
2163 lwp0.lwp_md.md_regs = &proc0_tf;
2167 * Initialize machine-dependant portions of the global data structure.
2168 * Note that the global data area and cpu0's idlestack in the private
2169 * data space were allocated in locore.
2171 * Note: the idlethread's cpl is 0
2173 * WARNING! Called from early boot, 'mycpu' may not work yet.
2176 cpu_gdinit(struct mdglobaldata *gd, int cpu)
2179 gd->mi.gd_curthread = &gd->mi.gd_idlethread;
2181 lwkt_init_thread(&gd->mi.gd_idlethread,
2182 gd->mi.gd_prvspace->idlestack,
2183 sizeof(gd->mi.gd_prvspace->idlestack),
2185 lwkt_set_comm(&gd->mi.gd_idlethread, "idle_%d", cpu);
2186 gd->mi.gd_idlethread.td_switch = cpu_lwkt_switch;
2187 gd->mi.gd_idlethread.td_sp -= sizeof(void *);
2188 *(void **)gd->mi.gd_idlethread.td_sp = cpu_idle_restore;
2192 is_globaldata_space(vm_offset_t saddr, vm_offset_t eaddr)
2194 if (saddr >= (vm_offset_t)&CPU_prvspace[0] &&
2195 eaddr <= (vm_offset_t)&CPU_prvspace[MAXCPU]) {
2202 globaldata_find(int cpu)
2204 KKASSERT(cpu >= 0 && cpu < ncpus);
2205 return(&CPU_prvspace[cpu].mdglobaldata.mi);
2208 #if defined(I586_CPU) && !defined(NO_F00F_HACK)
2209 static void f00f_hack(void *unused);
2210 SYSINIT(f00f_hack, SI_BOOT2_BIOS, SI_ORDER_ANY, f00f_hack, NULL);
2213 f00f_hack(void *unused)
2215 struct gate_descriptor *new_idt;
2221 kprintf("Intel Pentium detected, installing workaround for F00F bug\n");
2223 r_idt.rd_limit = sizeof(idt0) - 1;
2225 tmp = kmem_alloc(&kernel_map, PAGE_SIZE * 2);
2227 panic("kmem_alloc returned 0");
2228 if (((unsigned int)tmp & (PAGE_SIZE-1)) != 0)
2229 panic("kmem_alloc returned non-page-aligned memory");
2230 /* Put the first seven entries in the lower page */
2231 new_idt = (struct gate_descriptor*)(tmp + PAGE_SIZE - (7*8));
2232 bcopy(idt, new_idt, sizeof(idt0));
2233 r_idt.rd_base = (int)new_idt;
2236 if (vm_map_protect(&kernel_map, tmp, tmp + PAGE_SIZE,
2237 VM_PROT_READ, FALSE) != KERN_SUCCESS)
2238 panic("vm_map_protect failed");
2241 #endif /* defined(I586_CPU) && !NO_F00F_HACK */
2244 ptrace_set_pc(struct lwp *lp, unsigned long addr)
2246 lp->lwp_md.md_regs->tf_eip = addr;
2251 ptrace_single_step(struct lwp *lp)
2253 lp->lwp_md.md_regs->tf_eflags |= PSL_T;
2258 fill_regs(struct lwp *lp, struct reg *regs)
2260 struct trapframe *tp;
2262 tp = lp->lwp_md.md_regs;
2263 regs->r_gs = tp->tf_gs;
2264 regs->r_fs = tp->tf_fs;
2265 regs->r_es = tp->tf_es;
2266 regs->r_ds = tp->tf_ds;
2267 regs->r_edi = tp->tf_edi;
2268 regs->r_esi = tp->tf_esi;
2269 regs->r_ebp = tp->tf_ebp;
2270 regs->r_ebx = tp->tf_ebx;
2271 regs->r_edx = tp->tf_edx;
2272 regs->r_ecx = tp->tf_ecx;
2273 regs->r_eax = tp->tf_eax;
2274 regs->r_eip = tp->tf_eip;
2275 regs->r_cs = tp->tf_cs;
2276 regs->r_eflags = tp->tf_eflags;
2277 regs->r_esp = tp->tf_esp;
2278 regs->r_ss = tp->tf_ss;
2283 set_regs(struct lwp *lp, struct reg *regs)
2285 struct trapframe *tp;
2287 tp = lp->lwp_md.md_regs;
2288 if (!EFL_SECURE(regs->r_eflags, tp->tf_eflags) ||
2289 !CS_SECURE(regs->r_cs))
2291 tp->tf_gs = regs->r_gs;
2292 tp->tf_fs = regs->r_fs;
2293 tp->tf_es = regs->r_es;
2294 tp->tf_ds = regs->r_ds;
2295 tp->tf_edi = regs->r_edi;
2296 tp->tf_esi = regs->r_esi;
2297 tp->tf_ebp = regs->r_ebp;
2298 tp->tf_ebx = regs->r_ebx;
2299 tp->tf_edx = regs->r_edx;
2300 tp->tf_ecx = regs->r_ecx;
2301 tp->tf_eax = regs->r_eax;
2302 tp->tf_eip = regs->r_eip;
2303 tp->tf_cs = regs->r_cs;
2304 tp->tf_eflags = regs->r_eflags;
2305 tp->tf_esp = regs->r_esp;
2306 tp->tf_ss = regs->r_ss;
2310 #ifndef CPU_DISABLE_SSE
2312 fill_fpregs_xmm(struct savexmm *sv_xmm, struct save87 *sv_87)
2314 struct env87 *penv_87 = &sv_87->sv_env;
2315 struct envxmm *penv_xmm = &sv_xmm->sv_env;
2318 /* FPU control/status */
2319 penv_87->en_cw = penv_xmm->en_cw;
2320 penv_87->en_sw = penv_xmm->en_sw;
2321 penv_87->en_tw = penv_xmm->en_tw;
2322 penv_87->en_fip = penv_xmm->en_fip;
2323 penv_87->en_fcs = penv_xmm->en_fcs;
2324 penv_87->en_opcode = penv_xmm->en_opcode;
2325 penv_87->en_foo = penv_xmm->en_foo;
2326 penv_87->en_fos = penv_xmm->en_fos;
2329 for (i = 0; i < 8; ++i)
2330 sv_87->sv_ac[i] = sv_xmm->sv_fp[i].fp_acc;
2334 set_fpregs_xmm(struct save87 *sv_87, struct savexmm *sv_xmm)
2336 struct env87 *penv_87 = &sv_87->sv_env;
2337 struct envxmm *penv_xmm = &sv_xmm->sv_env;
2340 /* FPU control/status */
2341 penv_xmm->en_cw = penv_87->en_cw;
2342 penv_xmm->en_sw = penv_87->en_sw;
2343 penv_xmm->en_tw = penv_87->en_tw;
2344 penv_xmm->en_fip = penv_87->en_fip;
2345 penv_xmm->en_fcs = penv_87->en_fcs;
2346 penv_xmm->en_opcode = penv_87->en_opcode;
2347 penv_xmm->en_foo = penv_87->en_foo;
2348 penv_xmm->en_fos = penv_87->en_fos;
2351 for (i = 0; i < 8; ++i)
2352 sv_xmm->sv_fp[i].fp_acc = sv_87->sv_ac[i];
2354 #endif /* CPU_DISABLE_SSE */
2357 fill_fpregs(struct lwp *lp, struct fpreg *fpregs)
2359 #ifndef CPU_DISABLE_SSE
2361 fill_fpregs_xmm(&lp->lwp_thread->td_pcb->pcb_save.sv_xmm,
2362 (struct save87 *)fpregs);
2365 #endif /* CPU_DISABLE_SSE */
2366 bcopy(&lp->lwp_thread->td_pcb->pcb_save.sv_87, fpregs, sizeof *fpregs);
2371 set_fpregs(struct lwp *lp, struct fpreg *fpregs)
2373 #ifndef CPU_DISABLE_SSE
2375 set_fpregs_xmm((struct save87 *)fpregs,
2376 &lp->lwp_thread->td_pcb->pcb_save.sv_xmm);
2379 #endif /* CPU_DISABLE_SSE */
2380 bcopy(fpregs, &lp->lwp_thread->td_pcb->pcb_save.sv_87, sizeof *fpregs);
2385 fill_dbregs(struct lwp *lp, struct dbreg *dbregs)
2388 dbregs->dr0 = rdr0();
2389 dbregs->dr1 = rdr1();
2390 dbregs->dr2 = rdr2();
2391 dbregs->dr3 = rdr3();
2392 dbregs->dr4 = rdr4();
2393 dbregs->dr5 = rdr5();
2394 dbregs->dr6 = rdr6();
2395 dbregs->dr7 = rdr7();
2399 pcb = lp->lwp_thread->td_pcb;
2400 dbregs->dr0 = pcb->pcb_dr0;
2401 dbregs->dr1 = pcb->pcb_dr1;
2402 dbregs->dr2 = pcb->pcb_dr2;
2403 dbregs->dr3 = pcb->pcb_dr3;
2406 dbregs->dr6 = pcb->pcb_dr6;
2407 dbregs->dr7 = pcb->pcb_dr7;
2413 set_dbregs(struct lwp *lp, struct dbreg *dbregs)
2416 load_dr0(dbregs->dr0);
2417 load_dr1(dbregs->dr1);
2418 load_dr2(dbregs->dr2);
2419 load_dr3(dbregs->dr3);
2420 load_dr4(dbregs->dr4);
2421 load_dr5(dbregs->dr5);
2422 load_dr6(dbregs->dr6);
2423 load_dr7(dbregs->dr7);
2426 struct ucred *ucred;
2428 uint32_t mask1, mask2;
2431 * Don't let an illegal value for dr7 get set. Specifically,
2432 * check for undefined settings. Setting these bit patterns
2433 * result in undefined behaviour and can lead to an unexpected
2436 for (i = 0, mask1 = 0x3<<16, mask2 = 0x2<<16; i < 8;
2437 i++, mask1 <<= 2, mask2 <<= 2)
2438 if ((dbregs->dr7 & mask1) == mask2)
2441 pcb = lp->lwp_thread->td_pcb;
2442 ucred = lp->lwp_proc->p_ucred;
2445 * Don't let a process set a breakpoint that is not within the
2446 * process's address space. If a process could do this, it
2447 * could halt the system by setting a breakpoint in the kernel
2448 * (if ddb was enabled). Thus, we need to check to make sure
2449 * that no breakpoints are being enabled for addresses outside
2450 * process's address space, unless, perhaps, we were called by
2453 * XXX - what about when the watched area of the user's
2454 * address space is written into from within the kernel
2455 * ... wouldn't that still cause a breakpoint to be generated
2456 * from within kernel mode?
2459 if (priv_check_cred(ucred, PRIV_ROOT, 0) != 0) {
2460 if (dbregs->dr7 & 0x3) {
2461 /* dr0 is enabled */
2462 if (dbregs->dr0 >= VM_MAX_USER_ADDRESS)
2466 if (dbregs->dr7 & (0x3<<2)) {
2467 /* dr1 is enabled */
2468 if (dbregs->dr1 >= VM_MAX_USER_ADDRESS)
2472 if (dbregs->dr7 & (0x3<<4)) {
2473 /* dr2 is enabled */
2474 if (dbregs->dr2 >= VM_MAX_USER_ADDRESS)
2478 if (dbregs->dr7 & (0x3<<6)) {
2479 /* dr3 is enabled */
2480 if (dbregs->dr3 >= VM_MAX_USER_ADDRESS)
2485 pcb->pcb_dr0 = dbregs->dr0;
2486 pcb->pcb_dr1 = dbregs->dr1;
2487 pcb->pcb_dr2 = dbregs->dr2;
2488 pcb->pcb_dr3 = dbregs->dr3;
2489 pcb->pcb_dr6 = dbregs->dr6;
2490 pcb->pcb_dr7 = dbregs->dr7;
2492 pcb->pcb_flags |= PCB_DBREGS;
2499 * Return > 0 if a hardware breakpoint has been hit, and the
2500 * breakpoint was in user space. Return 0, otherwise.
2503 user_dbreg_trap(void)
2505 u_int32_t dr7, dr6; /* debug registers dr6 and dr7 */
2506 u_int32_t bp; /* breakpoint bits extracted from dr6 */
2507 int nbp; /* number of breakpoints that triggered */
2508 caddr_t addr[4]; /* breakpoint addresses */
2512 if ((dr7 & 0x000000ff) == 0) {
2514 * all GE and LE bits in the dr7 register are zero,
2515 * thus the trap couldn't have been caused by the
2516 * hardware debug registers
2523 bp = dr6 & 0x0000000f;
2527 * None of the breakpoint bits are set meaning this
2528 * trap was not caused by any of the debug registers
2534 * at least one of the breakpoints were hit, check to see
2535 * which ones and if any of them are user space addresses
2539 addr[nbp++] = (caddr_t)rdr0();
2542 addr[nbp++] = (caddr_t)rdr1();
2545 addr[nbp++] = (caddr_t)rdr2();
2548 addr[nbp++] = (caddr_t)rdr3();
2551 for (i=0; i<nbp; i++) {
2553 (caddr_t)VM_MAX_USER_ADDRESS) {
2555 * addr[i] is in user space
2562 * None of the breakpoints are in user space.
2570 Debugger(const char *msg)
2572 kprintf("Debugger(\"%s\") called.\n", msg);
2579 * Provide inb() and outb() as functions. They are normally only
2580 * available as macros calling inlined functions, thus cannot be
2581 * called inside DDB.
2583 * The actual code is stolen from <machine/cpufunc.h>, and de-inlined.
2589 /* silence compiler warnings */
2591 void outb(u_int, u_char);
2598 * We use %%dx and not %1 here because i/o is done at %dx and not at
2599 * %edx, while gcc generates inferior code (movw instead of movl)
2600 * if we tell it to load (u_short) port.
2602 __asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port));
2607 outb(u_int port, u_char data)
2611 * Use an unnecessary assignment to help gcc's register allocator.
2612 * This make a large difference for gcc-1.40 and a tiny difference
2613 * for gcc-2.6.0. For gcc-1.40, al had to be ``asm("ax")'' for
2614 * best results. gcc-2.6.0 can't handle this.
2617 __asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port));
2624 #include "opt_cpu.h"
2628 * initialize all the SMP locks
2631 /* critical region when masking or unmasking interupts */
2632 struct spinlock_deprecated imen_spinlock;
2634 /* critical region for old style disable_intr/enable_intr */
2635 struct spinlock_deprecated mpintr_spinlock;
2637 /* critical region around INTR() routines */
2638 struct spinlock_deprecated intr_spinlock;
2640 /* lock region used by kernel profiling */
2641 struct spinlock_deprecated mcount_spinlock;
2643 /* locks com (tty) data/hardware accesses: a FASTINTR() */
2644 struct spinlock_deprecated com_spinlock;
2646 /* lock regions around the clock hardware */
2647 struct spinlock_deprecated clock_spinlock;
2649 /* lock around the MP rendezvous */
2650 struct spinlock_deprecated smp_rv_spinlock;
2657 * Get the initial mplock with a count of 1 for the BSP.
2658 * This uses a LOGICAL cpu ID, ie BSP == 0.
2660 cpu_get_initial_mplock();
2663 spin_lock_init(&mcount_spinlock);
2664 spin_lock_init(&intr_spinlock);
2665 spin_lock_init(&mpintr_spinlock);
2666 spin_lock_init(&imen_spinlock);
2667 spin_lock_init(&smp_rv_spinlock);
2668 spin_lock_init(&com_spinlock);
2669 spin_lock_init(&clock_spinlock);
2671 /* our token pool needs to work early */
2672 lwkt_token_pool_init();