2 * Copyright (c) 1992 Terrence R. Lambert.
3 * Copyright (c) 1982, 1987, 1990 The Regents of the University of California.
6 * This code is derived from software contributed to Berkeley by
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. All advertising materials mentioning features or use of this software
18 * must display the following acknowledgement:
19 * This product includes software developed by the University of
20 * California, Berkeley and its contributors.
21 * 4. Neither the name of the University nor the names of its contributors
22 * may be used to endorse or promote products derived from this software
23 * without specific prior written permission.
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 * from: @(#)machdep.c 7.4 (Berkeley) 6/3/91
38 * $FreeBSD: src/sys/i386/i386/machdep.c,v 1.385.2.30 2003/05/31 08:48:05 alc Exp $
39 * $DragonFly: src/sys/platform/pc32/i386/machdep.c,v 1.113 2007/01/09 07:03:32 dillon Exp $
43 #include "use_ether.h"
46 #include "opt_atalk.h"
47 #include "opt_compat.h"
50 #include "opt_directio.h"
53 #include "opt_maxmem.h"
54 #include "opt_msgbuf.h"
55 #include "opt_perfmon.h"
57 #include "opt_userconfig.h"
59 #include <sys/param.h>
60 #include <sys/systm.h>
61 #include <sys/sysproto.h>
62 #include <sys/signalvar.h>
63 #include <sys/kernel.h>
64 #include <sys/linker.h>
65 #include <sys/malloc.h>
68 #include <sys/reboot.h>
70 #include <sys/msgbuf.h>
71 #include <sys/sysent.h>
72 #include <sys/sysctl.h>
73 #include <sys/vmmeter.h>
75 #include <sys/upcall.h>
76 #include <sys/usched.h>
80 #include <vm/vm_param.h>
82 #include <vm/vm_kern.h>
83 #include <vm/vm_object.h>
84 #include <vm/vm_page.h>
85 #include <vm/vm_map.h>
86 #include <vm/vm_pager.h>
87 #include <vm/vm_extern.h>
89 #include <sys/thread2.h>
97 #include <machine/cpu.h>
98 #include <machine/clock.h>
99 #include <machine/specialreg.h>
100 #include <machine/bootinfo.h>
101 #include <machine/md_var.h>
102 #include <machine/pcb_ext.h> /* pcb.h included via sys/user.h */
103 #include <machine/globaldata.h> /* CPU_prvspace */
104 #include <machine/smp.h>
106 #include <machine/perfmon.h>
108 #include <machine/cputypes.h>
111 #include <bus/isa/i386/isa_device.h>
113 #include <machine_base/isa/intr_machdep.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 #define PHYSMAP_ENTRIES 10
122 extern void init386 (int first);
123 extern void dblfault_handler (void);
125 extern void printcpuinfo(void); /* XXX header file */
126 extern void finishidentcpu(void);
127 extern void panicifcpuunsupported(void);
128 extern void initializecpu(void);
130 static void cpu_startup (void *);
131 #ifndef CPU_DISABLE_SSE
132 static void set_fpregs_xmm (struct save87 *, struct savexmm *);
133 static void fill_fpregs_xmm (struct savexmm *, struct save87 *);
134 #endif /* CPU_DISABLE_SSE */
136 extern void ffs_rawread_setup(void);
137 #endif /* DIRECTIO */
138 static void init_locks(void);
140 SYSINIT(cpu, SI_SUB_CPU, SI_ORDER_FIRST, cpu_startup, NULL)
142 int _udatasel, _ucodesel;
145 int64_t tsc_offsets[MAXCPU];
147 int64_t tsc_offsets[1];
150 #if defined(SWTCH_OPTIM_STATS)
151 extern int swtch_optim_stats;
152 SYSCTL_INT(_debug, OID_AUTO, swtch_optim_stats,
153 CTLFLAG_RD, &swtch_optim_stats, 0, "");
154 SYSCTL_INT(_debug, OID_AUTO, tlb_flush_count,
155 CTLFLAG_RD, &tlb_flush_count, 0, "");
161 sysctl_hw_physmem(SYSCTL_HANDLER_ARGS)
163 int error = sysctl_handle_int(oidp, 0, ctob(physmem), req);
167 SYSCTL_PROC(_hw, HW_PHYSMEM, physmem, CTLTYPE_INT|CTLFLAG_RD,
168 0, 0, sysctl_hw_physmem, "IU", "");
171 sysctl_hw_usermem(SYSCTL_HANDLER_ARGS)
173 int error = sysctl_handle_int(oidp, 0,
174 ctob(physmem - vmstats.v_wire_count), req);
178 SYSCTL_PROC(_hw, HW_USERMEM, usermem, CTLTYPE_INT|CTLFLAG_RD,
179 0, 0, sysctl_hw_usermem, "IU", "");
182 sysctl_hw_availpages(SYSCTL_HANDLER_ARGS)
184 int error = sysctl_handle_int(oidp, 0,
185 i386_btop(avail_end - avail_start), req);
189 SYSCTL_PROC(_hw, OID_AUTO, availpages, CTLTYPE_INT|CTLFLAG_RD,
190 0, 0, sysctl_hw_availpages, "I", "");
193 sysctl_machdep_msgbuf(SYSCTL_HANDLER_ARGS)
197 /* Unwind the buffer, so that it's linear (possibly starting with
198 * some initial nulls).
200 error=sysctl_handle_opaque(oidp,msgbufp->msg_ptr+msgbufp->msg_bufr,
201 msgbufp->msg_size-msgbufp->msg_bufr,req);
202 if(error) return(error);
203 if(msgbufp->msg_bufr>0) {
204 error=sysctl_handle_opaque(oidp,msgbufp->msg_ptr,
205 msgbufp->msg_bufr,req);
210 SYSCTL_PROC(_machdep, OID_AUTO, msgbuf, CTLTYPE_STRING|CTLFLAG_RD,
211 0, 0, sysctl_machdep_msgbuf, "A","Contents of kernel message buffer");
213 static int msgbuf_clear;
216 sysctl_machdep_msgbuf_clear(SYSCTL_HANDLER_ARGS)
219 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2,
221 if (!error && req->newptr) {
222 /* Clear the buffer and reset write pointer */
223 bzero(msgbufp->msg_ptr,msgbufp->msg_size);
224 msgbufp->msg_bufr=msgbufp->msg_bufx=0;
230 SYSCTL_PROC(_machdep, OID_AUTO, msgbuf_clear, CTLTYPE_INT|CTLFLAG_RW,
231 &msgbuf_clear, 0, sysctl_machdep_msgbuf_clear, "I",
232 "Clear kernel message buffer");
234 vm_paddr_t Maxmem = 0;
236 vm_paddr_t phys_avail[PHYSMAP_ENTRIES*2+2];
238 static vm_offset_t buffer_sva, buffer_eva;
239 vm_offset_t clean_sva, clean_eva;
240 static vm_offset_t pager_sva, pager_eva;
241 static struct trapframe proc0_tf;
244 cpu_startup(void *dummy)
250 vm_offset_t firstaddr;
252 if (boothowto & RB_VERBOSE)
256 * Good {morning,afternoon,evening,night}.
258 kprintf("%s", version);
261 panicifcpuunsupported();
265 kprintf("real memory = %llu (%lluK bytes)\n", ptoa(Maxmem), ptoa(Maxmem) / 1024);
267 * Display any holes after the first chunk of extended memory.
272 kprintf("Physical memory chunk(s):\n");
273 for (indx = 0; phys_avail[indx + 1] != 0; indx += 2) {
274 vm_paddr_t size1 = phys_avail[indx + 1] - phys_avail[indx];
276 kprintf("0x%08llx - 0x%08llx, %llu bytes (%llu pages)\n",
277 phys_avail[indx], phys_avail[indx + 1] - 1, size1,
283 * Allocate space for system data structures.
284 * The first available kernel virtual address is in "v".
285 * As pages of kernel virtual memory are allocated, "v" is incremented.
286 * As pages of memory are allocated and cleared,
287 * "firstaddr" is incremented.
288 * An index into the kernel page table corresponding to the
289 * virtual memory address maintained in "v" is kept in "mapaddr".
293 * Make two passes. The first pass calculates how much memory is
294 * needed and allocates it. The second pass assigns virtual
295 * addresses to the various data structures.
299 v = (caddr_t)firstaddr;
301 #define valloc(name, type, num) \
302 (name) = (type *)v; v = (caddr_t)((name)+(num))
303 #define valloclim(name, type, num, lim) \
304 (name) = (type *)v; v = (caddr_t)((lim) = ((name)+(num)))
307 * The nominal buffer size (and minimum KVA allocation) is BKVASIZE.
308 * For the first 64MB of ram nominally allocate sufficient buffers to
309 * cover 1/4 of our ram. Beyond the first 64MB allocate additional
310 * buffers to cover 1/20 of our ram over 64MB. When auto-sizing
311 * the buffer cache we limit the eventual kva reservation to
314 * factor represents the 1/4 x ram conversion.
317 int factor = 4 * BKVASIZE / 1024;
318 int kbytes = physmem * (PAGE_SIZE / 1024);
322 nbuf += min((kbytes - 4096) / factor, 65536 / factor);
324 nbuf += (kbytes - 65536) * 2 / (factor * 5);
325 if (maxbcache && nbuf > maxbcache / BKVASIZE)
326 nbuf = maxbcache / BKVASIZE;
330 * Do not allow the buffer_map to be more then 1/2 the size of the
333 if (nbuf > (virtual_end - virtual_start) / (BKVASIZE * 2)) {
334 nbuf = (virtual_end - virtual_start) / (BKVASIZE * 2);
335 kprintf("Warning: nbufs capped at %d\n", nbuf);
338 nswbuf = max(min(nbuf/4, 256), 16);
340 if (nswbuf < NSWBUF_MIN)
347 valloc(swbuf, struct buf, nswbuf);
348 valloc(buf, struct buf, nbuf);
351 * End of first pass, size has been calculated so allocate memory
353 if (firstaddr == 0) {
354 size = (vm_size_t)(v - firstaddr);
355 firstaddr = kmem_alloc(&kernel_map, round_page(size));
357 panic("startup: no room for tables");
362 * End of second pass, addresses have been assigned
364 if ((vm_size_t)(v - firstaddr) != size)
365 panic("startup: table size inconsistency");
367 kmem_suballoc(&kernel_map, &clean_map, &clean_sva, &clean_eva,
368 (nbuf*BKVASIZE) + (nswbuf*MAXPHYS) + pager_map_size);
369 kmem_suballoc(&clean_map, &buffer_map, &buffer_sva, &buffer_eva,
371 buffer_map.system_map = 1;
372 kmem_suballoc(&clean_map, &pager_map, &pager_sva, &pager_eva,
373 (nswbuf*MAXPHYS) + pager_map_size);
374 pager_map.system_map = 1;
375 kmem_suballoc(&kernel_map, &exec_map, &minaddr, &maxaddr,
376 (16*(ARG_MAX+(PAGE_SIZE*3))));
378 #if defined(USERCONFIG)
380 cninit(); /* the preferred console may have changed */
383 kprintf("avail memory = %u (%uK bytes)\n", ptoa(vmstats.v_free_count),
384 ptoa(vmstats.v_free_count) / 1024);
387 * Set up buffers, so they can be used to read disk labels.
390 vm_pager_bufferinit();
394 * OK, enough kmem_alloc/malloc state should be up, lets get on with it!
396 mp_start(); /* fire up the APs and APICs */
403 * Send an interrupt to process.
405 * Stack is set up to allow sigcode stored
406 * at top to call routine, followed by kcall
407 * to sigreturn routine below. After sigreturn
408 * resets the signal mask, the stack, and the
409 * frame pointer, it returns to the user
413 sendsig(sig_t catcher, int sig, sigset_t *mask, u_long code)
415 struct lwp *lp = curthread->td_lwp;
416 struct proc *p = lp->lwp_proc;
417 struct trapframe *regs;
418 struct sigacts *psp = p->p_sigacts;
419 struct sigframe sf, *sfp;
422 regs = lp->lwp_md.md_regs;
423 oonstack = (lp->lwp_sigstk.ss_flags & SS_ONSTACK) ? 1 : 0;
426 * If we are a virtual kernel running an emulated user process
427 * context, switch back to the virtual kernel context before
428 * trying to post the signal.
430 if (p->p_vkernel && p->p_vkernel->vk_current) {
432 vkernel_trap(p, regs);
436 /* save user context */
437 bzero(&sf, sizeof(struct sigframe));
438 sf.sf_uc.uc_sigmask = *mask;
439 sf.sf_uc.uc_stack = lp->lwp_sigstk;
440 sf.sf_uc.uc_mcontext.mc_onstack = oonstack;
441 bcopy(regs, &sf.sf_uc.uc_mcontext.mc_gs, sizeof(struct trapframe));
443 /* Allocate and validate space for the signal handler context. */
445 if ((p->p_flag & P_ALTSTACK) != 0 && !oonstack &&
446 SIGISMEMBER(psp->ps_sigonstack, sig)) {
447 sfp = (struct sigframe *)(lp->lwp_sigstk.ss_sp +
448 lp->lwp_sigstk.ss_size - sizeof(struct sigframe));
449 lp->lwp_sigstk.ss_flags |= SS_ONSTACK;
451 sfp = (struct sigframe *)regs->tf_esp - 1;
454 /* Translate the signal is appropriate */
455 if (p->p_sysent->sv_sigtbl) {
456 if (sig <= p->p_sysent->sv_sigsize)
457 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)];
460 /* Build the argument list for the signal handler. */
462 sf.sf_ucontext = (register_t)&sfp->sf_uc;
463 if (SIGISMEMBER(psp->ps_siginfo, sig)) {
464 /* Signal handler installed with SA_SIGINFO. */
465 sf.sf_siginfo = (register_t)&sfp->sf_si;
466 sf.sf_ahu.sf_action = (__siginfohandler_t *)catcher;
468 /* fill siginfo structure */
469 sf.sf_si.si_signo = sig;
470 sf.sf_si.si_code = code;
471 sf.sf_si.si_addr = (void*)regs->tf_err;
474 /* Old FreeBSD-style arguments. */
475 sf.sf_siginfo = code;
476 sf.sf_addr = regs->tf_err;
477 sf.sf_ahu.sf_handler = catcher;
481 * If we're a vm86 process, we want to save the segment registers.
482 * We also change eflags to be our emulated eflags, not the actual
485 if (regs->tf_eflags & PSL_VM) {
486 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs;
487 struct vm86_kernel *vm86 = &lp->lwp_thread->td_pcb->pcb_ext->ext_vm86;
489 sf.sf_uc.uc_mcontext.mc_gs = tf->tf_vm86_gs;
490 sf.sf_uc.uc_mcontext.mc_fs = tf->tf_vm86_fs;
491 sf.sf_uc.uc_mcontext.mc_es = tf->tf_vm86_es;
492 sf.sf_uc.uc_mcontext.mc_ds = tf->tf_vm86_ds;
494 if (vm86->vm86_has_vme == 0)
495 sf.sf_uc.uc_mcontext.mc_eflags =
496 (tf->tf_eflags & ~(PSL_VIF | PSL_VIP)) |
497 (vm86->vm86_eflags & (PSL_VIF | PSL_VIP));
500 * Clear PSL_NT to inhibit T_TSSFLT faults on return from
501 * syscalls made by the signal handler. This just avoids
502 * wasting time for our lazy fixup of such faults. PSL_NT
503 * does nothing in vm86 mode, but vm86 programs can set it
504 * almost legitimately in probes for old cpu types.
506 tf->tf_eflags &= ~(PSL_VM | PSL_NT | PSL_VIF | PSL_VIP);
510 * Copy the sigframe out to the user's stack.
512 if (copyout(&sf, sfp, sizeof(struct sigframe)) != 0) {
514 * Something is wrong with the stack pointer.
515 * ...Kill the process.
520 regs->tf_esp = (int)sfp;
521 regs->tf_eip = PS_STRINGS - *(p->p_sysent->sv_szsigcode);
522 regs->tf_eflags &= ~PSL_T;
523 regs->tf_cs = _ucodesel;
524 regs->tf_ds = _udatasel;
525 regs->tf_es = _udatasel;
528 * Allow the signal handler to inherit %fs in addition to %gs as
529 * the userland program might be using both.
531 * However, if a T_PROTFLT occured the segment registers could be
532 * totally broken. They must be reset in order to be able to
533 * return to userland.
535 if (regs->tf_trapno == T_PROTFLT) {
536 regs->tf_fs = _udatasel;
537 regs->tf_gs = _udatasel;
539 regs->tf_ss = _udatasel;
543 * Sanitize the trapframe for a virtual kernel passing control to a custom
544 * VM context. Remove any items that would otherwise create a privilage
547 * XXX at the moment we allow userland to set the resume flag. Is this a
551 cpu_sanitize_frame(struct trapframe *frame)
553 frame->tf_cs = _ucodesel;
554 frame->tf_ds = _udatasel;
555 frame->tf_es = _udatasel; /* XXX allow userland this one too? */
557 frame->tf_fs = _udatasel;
558 frame->tf_gs = _udatasel;
560 frame->tf_ss = _udatasel;
561 frame->tf_eflags &= (PSL_RF | PSL_USERCHANGE);
562 frame->tf_eflags |= PSL_RESERVED_DEFAULT | PSL_I;
567 cpu_sanitize_tls(struct savetls *tls)
569 struct segment_descriptor *desc;
572 for (i = 0; i < NGTLS; ++i) {
574 if (desc->sd_dpl == 0 && desc->sd_type == 0)
576 if (desc->sd_def32 == 0)
578 if (desc->sd_type != SDT_MEMRWA)
580 if (desc->sd_dpl != SEL_UPL)
582 if (desc->sd_xx != 0 || desc->sd_p != 1)
589 * sigreturn(ucontext_t *sigcntxp)
591 * System call to cleanup state after a signal
592 * has been taken. Reset signal mask and
593 * stack state from context left by sendsig (above).
594 * Return to previous pc and psl as specified by
595 * context left by sendsig. Check carefully to
596 * make sure that the user has not modified the
597 * state to gain improper privileges.
599 #define EFL_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0)
600 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL)
603 sys_sigreturn(struct sigreturn_args *uap)
605 struct lwp *lp = curthread->td_lwp;
606 struct trapframe *regs;
612 if (!useracc((caddr_t)ucp, sizeof(ucontext_t), VM_PROT_READ))
615 regs = lp->lwp_md.md_regs;
616 eflags = ucp->uc_mcontext.mc_eflags;
618 if (eflags & PSL_VM) {
619 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs;
620 struct vm86_kernel *vm86;
623 * if pcb_ext == 0 or vm86_inited == 0, the user hasn't
624 * set up the vm86 area, and we can't enter vm86 mode.
626 if (lp->lwp_thread->td_pcb->pcb_ext == 0)
628 vm86 = &lp->lwp_thread->td_pcb->pcb_ext->ext_vm86;
629 if (vm86->vm86_inited == 0)
632 /* go back to user mode if both flags are set */
633 if ((eflags & PSL_VIP) && (eflags & PSL_VIF))
634 trapsignal(lp->lwp_proc, SIGBUS, 0);
636 if (vm86->vm86_has_vme) {
637 eflags = (tf->tf_eflags & ~VME_USERCHANGE) |
638 (eflags & VME_USERCHANGE) | PSL_VM;
640 vm86->vm86_eflags = eflags; /* save VIF, VIP */
641 eflags = (tf->tf_eflags & ~VM_USERCHANGE) | (eflags & VM_USERCHANGE) | PSL_VM;
643 bcopy(&ucp->uc_mcontext.mc_gs, tf, sizeof(struct trapframe));
644 tf->tf_eflags = eflags;
645 tf->tf_vm86_ds = tf->tf_ds;
646 tf->tf_vm86_es = tf->tf_es;
647 tf->tf_vm86_fs = tf->tf_fs;
648 tf->tf_vm86_gs = tf->tf_gs;
649 tf->tf_ds = _udatasel;
650 tf->tf_es = _udatasel;
652 tf->tf_fs = _udatasel;
653 tf->tf_gs = _udatasel;
657 * Don't allow users to change privileged or reserved flags.
660 * XXX do allow users to change the privileged flag PSL_RF.
661 * The cpu sets PSL_RF in tf_eflags for faults. Debuggers
662 * should sometimes set it there too. tf_eflags is kept in
663 * the signal context during signal handling and there is no
664 * other place to remember it, so the PSL_RF bit may be
665 * corrupted by the signal handler without us knowing.
666 * Corruption of the PSL_RF bit at worst causes one more or
667 * one less debugger trap, so allowing it is fairly harmless.
669 if (!EFL_SECURE(eflags & ~PSL_RF, regs->tf_eflags & ~PSL_RF)) {
670 kprintf("sigreturn: eflags = 0x%x\n", eflags);
675 * Don't allow users to load a valid privileged %cs. Let the
676 * hardware check for invalid selectors, excess privilege in
677 * other selectors, invalid %eip's and invalid %esp's.
679 cs = ucp->uc_mcontext.mc_cs;
680 if (!CS_SECURE(cs)) {
681 kprintf("sigreturn: cs = 0x%x\n", cs);
682 trapsignal(lp->lwp_proc, SIGBUS, T_PROTFLT);
685 bcopy(&ucp->uc_mcontext.mc_gs, regs, sizeof(struct trapframe));
688 if (ucp->uc_mcontext.mc_onstack & 1)
689 lp->lwp_sigstk.ss_flags |= SS_ONSTACK;
691 lp->lwp_sigstk.ss_flags &= ~SS_ONSTACK;
693 lp->lwp_sigmask = ucp->uc_sigmask;
694 SIG_CANTMASK(lp->lwp_sigmask);
699 * Stack frame on entry to function. %eax will contain the function vector,
700 * %ecx will contain the function data. flags, ecx, and eax will have
701 * already been pushed on the stack.
712 sendupcall(struct vmupcall *vu, int morepending)
714 struct lwp *lp = curthread->td_lwp;
715 struct proc *p = lp->lwp_proc;
716 struct trapframe *regs;
717 struct upcall upcall;
718 struct upc_frame upc_frame;
722 * If we are a virtual kernel running an emulated user process
723 * context, switch back to the virtual kernel context before
724 * trying to post the signal.
726 if (p->p_vkernel && p->p_vkernel->vk_current) {
727 lp->lwp_md.md_regs->tf_trapno = 0;
728 vkernel_trap(p, lp->lwp_md.md_regs);
732 * Get the upcall data structure
734 if (copyin(lp->lwp_upcall, &upcall, sizeof(upcall)) ||
735 copyin((char *)upcall.upc_uthread + upcall.upc_critoff, &crit_count, sizeof(int))
738 kprintf("bad upcall address\n");
743 * If the data structure is already marked pending or has a critical
744 * section count, mark the data structure as pending and return
745 * without doing an upcall. vu_pending is left set.
747 if (upcall.upc_pending || crit_count >= vu->vu_pending) {
748 if (upcall.upc_pending < vu->vu_pending) {
749 upcall.upc_pending = vu->vu_pending;
750 copyout(&upcall.upc_pending, &lp->lwp_upcall->upc_pending,
751 sizeof(upcall.upc_pending));
757 * We can run this upcall now, clear vu_pending.
759 * Bump our critical section count and set or clear the
760 * user pending flag depending on whether more upcalls are
761 * pending. The user will be responsible for calling
762 * upc_dispatch(-1) to process remaining upcalls.
765 upcall.upc_pending = morepending;
766 crit_count += TDPRI_CRIT;
767 copyout(&upcall.upc_pending, &lp->lwp_upcall->upc_pending,
768 sizeof(upcall.upc_pending));
769 copyout(&crit_count, (char *)upcall.upc_uthread + upcall.upc_critoff,
773 * Construct a stack frame and issue the upcall
775 regs = lp->lwp_md.md_regs;
776 upc_frame.eax = regs->tf_eax;
777 upc_frame.ecx = regs->tf_ecx;
778 upc_frame.edx = regs->tf_edx;
779 upc_frame.flags = regs->tf_eflags;
780 upc_frame.oldip = regs->tf_eip;
781 if (copyout(&upc_frame, (void *)(regs->tf_esp - sizeof(upc_frame)),
782 sizeof(upc_frame)) != 0) {
783 kprintf("bad stack on upcall\n");
785 regs->tf_eax = (register_t)vu->vu_func;
786 regs->tf_ecx = (register_t)vu->vu_data;
787 regs->tf_edx = (register_t)lp->lwp_upcall;
788 regs->tf_eip = (register_t)vu->vu_ctx;
789 regs->tf_esp -= sizeof(upc_frame);
794 * fetchupcall occurs in the context of a system call, which means that
795 * we have to return EJUSTRETURN in order to prevent eax and edx from
796 * being overwritten by the syscall return value.
798 * if vu is not NULL we return the new context in %edx, the new data in %ecx,
799 * and the function pointer in %eax.
802 fetchupcall (struct vmupcall *vu, int morepending, void *rsp)
804 struct upc_frame upc_frame;
805 struct lwp *lp = curthread->td_lwp;
806 struct trapframe *regs;
808 struct upcall upcall;
811 regs = lp->lwp_md.md_regs;
813 error = copyout(&morepending, &lp->lwp_upcall->upc_pending, sizeof(int));
817 * This jumps us to the next ready context.
820 error = copyin(lp->lwp_upcall, &upcall, sizeof(upcall));
823 error = copyin((char *)upcall.upc_uthread + upcall.upc_critoff, &crit_count, sizeof(int));
824 crit_count += TDPRI_CRIT;
826 error = copyout(&crit_count, (char *)upcall.upc_uthread + upcall.upc_critoff, sizeof(int));
827 regs->tf_eax = (register_t)vu->vu_func;
828 regs->tf_ecx = (register_t)vu->vu_data;
829 regs->tf_edx = (register_t)lp->lwp_upcall;
830 regs->tf_eip = (register_t)vu->vu_ctx;
831 regs->tf_esp = (register_t)rsp;
834 * This returns us to the originally interrupted code.
836 error = copyin(rsp, &upc_frame, sizeof(upc_frame));
837 regs->tf_eax = upc_frame.eax;
838 regs->tf_ecx = upc_frame.ecx;
839 regs->tf_edx = upc_frame.edx;
840 regs->tf_eflags = (regs->tf_eflags & ~PSL_USERCHANGE) |
841 (upc_frame.flags & PSL_USERCHANGE);
842 regs->tf_eip = upc_frame.oldip;
843 regs->tf_esp = (register_t)((char *)rsp + sizeof(upc_frame));
852 * Machine dependent boot() routine
854 * I haven't seen anything to put here yet
855 * Possibly some stuff might be grafted back here from boot()
863 * Shutdown the CPU as much as possible
869 __asm__ __volatile("hlt");
873 * cpu_idle() represents the idle LWKT. You cannot return from this function
874 * (unless you want to blow things up!). Instead we look for runnable threads
875 * and loop or halt as appropriate. Giant is not held on entry to the thread.
877 * The main loop is entered with a critical section held, we must release
878 * the critical section before doing anything else. lwkt_switch() will
879 * check for pending interrupts due to entering and exiting its own
882 * Note on cpu_idle_hlt: On an SMP system we rely on a scheduler IPI
883 * to wake a HLTed cpu up. However, there are cases where the idlethread
884 * will be entered with the possibility that no IPI will occur and in such
885 * cases lwkt_switch() sets TDF_IDLE_NOHLT.
887 static int cpu_idle_hlt = 1;
888 static int cpu_idle_hltcnt;
889 static int cpu_idle_spincnt;
890 SYSCTL_INT(_machdep, OID_AUTO, cpu_idle_hlt, CTLFLAG_RW,
891 &cpu_idle_hlt, 0, "Idle loop HLT enable");
892 SYSCTL_INT(_machdep, OID_AUTO, cpu_idle_hltcnt, CTLFLAG_RW,
893 &cpu_idle_hltcnt, 0, "Idle loop entry halts");
894 SYSCTL_INT(_machdep, OID_AUTO, cpu_idle_spincnt, CTLFLAG_RW,
895 &cpu_idle_spincnt, 0, "Idle loop entry spins");
898 cpu_idle_default_hook(void)
901 * We must guarentee that hlt is exactly the instruction
904 __asm __volatile("sti; hlt");
907 /* Other subsystems (e.g., ACPI) can hook this later. */
908 void (*cpu_idle_hook)(void) = cpu_idle_default_hook;
913 struct thread *td = curthread;
916 KKASSERT(td->td_pri < TDPRI_CRIT);
919 * See if there are any LWKTs ready to go.
924 * If we are going to halt call splz unconditionally after
925 * CLIing to catch any interrupt races. Note that we are
926 * at SPL0 and interrupts are enabled.
928 if (cpu_idle_hlt && !lwkt_runnable() &&
929 (td->td_flags & TDF_IDLE_NOHLT) == 0) {
930 __asm __volatile("cli");
932 if (!lwkt_runnable())
936 __asm __volatile("pause");
940 td->td_flags &= ~TDF_IDLE_NOHLT;
943 __asm __volatile("sti; pause");
945 __asm __volatile("sti");
953 * Clear registers on exec
956 setregs(struct lwp *lp, u_long entry, u_long stack, u_long ps_strings)
958 struct trapframe *regs = lp->lwp_md.md_regs;
959 struct pcb *pcb = lp->lwp_thread->td_pcb;
961 /* was i386_user_cleanup() in NetBSD */
964 bzero((char *)regs, sizeof(struct trapframe));
965 regs->tf_eip = entry;
966 regs->tf_esp = stack;
967 regs->tf_eflags = PSL_USER | (regs->tf_eflags & PSL_T);
968 regs->tf_ss = _udatasel;
969 regs->tf_ds = _udatasel;
970 regs->tf_es = _udatasel;
971 regs->tf_fs = _udatasel;
972 regs->tf_gs = _udatasel;
973 regs->tf_cs = _ucodesel;
975 /* PS_STRINGS value for BSD/OS binaries. It is 0 for non-BSD/OS. */
976 regs->tf_ebx = ps_strings;
979 * Reset the hardware debug registers if they were in use.
980 * They won't have any meaning for the newly exec'd process.
982 if (pcb->pcb_flags & PCB_DBREGS) {
989 if (pcb == curthread->td_pcb) {
991 * Clear the debug registers on the running
992 * CPU, otherwise they will end up affecting
993 * the next process we switch to.
997 pcb->pcb_flags &= ~PCB_DBREGS;
1001 * Initialize the math emulator (if any) for the current process.
1002 * Actually, just clear the bit that says that the emulator has
1003 * been initialized. Initialization is delayed until the process
1004 * traps to the emulator (if it is done at all) mainly because
1005 * emulators don't provide an entry point for initialization.
1007 lp->lwp_thread->td_pcb->pcb_flags &= ~FP_SOFTFP;
1010 * note: do not set CR0_TS here. npxinit() must do it after clearing
1011 * gd_npxthread. Otherwise a preemptive interrupt thread may panic
1015 load_cr0(rcr0() | CR0_MP);
1018 /* Initialize the npx (if any) for the current process. */
1019 npxinit(__INITIAL_NPXCW__);
1024 * note: linux emulator needs edx to be 0x0 on entry, which is
1025 * handled in execve simply by setting the 64 bit syscall
1026 * return value to 0.
1036 cr0 |= CR0_NE; /* Done by npxinit() */
1037 cr0 |= CR0_MP | CR0_TS; /* Done at every execve() too. */
1039 if (cpu_class != CPUCLASS_386)
1041 cr0 |= CR0_WP | CR0_AM;
1047 sysctl_machdep_adjkerntz(SYSCTL_HANDLER_ARGS)
1050 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2,
1052 if (!error && req->newptr)
1057 SYSCTL_PROC(_machdep, CPU_ADJKERNTZ, adjkerntz, CTLTYPE_INT|CTLFLAG_RW,
1058 &adjkerntz, 0, sysctl_machdep_adjkerntz, "I", "");
1060 SYSCTL_INT(_machdep, CPU_DISRTCSET, disable_rtc_set,
1061 CTLFLAG_RW, &disable_rtc_set, 0, "");
1063 SYSCTL_STRUCT(_machdep, CPU_BOOTINFO, bootinfo,
1064 CTLFLAG_RD, &bootinfo, bootinfo, "");
1066 SYSCTL_INT(_machdep, CPU_WALLCLOCK, wall_cmos_clock,
1067 CTLFLAG_RW, &wall_cmos_clock, 0, "");
1069 extern u_long bootdev; /* not a cdev_t - encoding is different */
1070 SYSCTL_ULONG(_machdep, OID_AUTO, guessed_bootdev,
1071 CTLFLAG_RD, &bootdev, 0, "Boot device (not in cdev_t format)");
1074 * Initialize 386 and configure to run kernel
1078 * Initialize segments & interrupt table
1082 union descriptor gdt[NGDT * MAXCPU]; /* global descriptor table */
1083 static struct gate_descriptor idt0[NIDT];
1084 struct gate_descriptor *idt = &idt0[0]; /* interrupt descriptor table */
1085 union descriptor ldt[NLDT]; /* local descriptor table */
1087 /* table descriptors - used to load tables by cpu */
1088 struct region_descriptor r_gdt, r_idt;
1090 #if defined(I586_CPU) && !defined(NO_F00F_HACK)
1091 extern int has_f00f_bug;
1094 static struct i386tss dblfault_tss;
1095 static char dblfault_stack[PAGE_SIZE];
1097 extern struct user *proc0paddr;
1100 /* software prototypes -- in more palatable form */
1101 struct soft_segment_descriptor gdt_segs[] = {
1102 /* GNULL_SEL 0 Null Descriptor */
1103 { 0x0, /* segment base address */
1105 0, /* segment type */
1106 0, /* segment descriptor priority level */
1107 0, /* segment descriptor present */
1109 0, /* default 32 vs 16 bit size */
1110 0 /* limit granularity (byte/page units)*/ },
1111 /* GCODE_SEL 1 Code Descriptor for kernel */
1112 { 0x0, /* segment base address */
1113 0xfffff, /* length - all address space */
1114 SDT_MEMERA, /* segment type */
1115 0, /* segment descriptor priority level */
1116 1, /* segment descriptor present */
1118 1, /* default 32 vs 16 bit size */
1119 1 /* limit granularity (byte/page units)*/ },
1120 /* GDATA_SEL 2 Data Descriptor for kernel */
1121 { 0x0, /* segment base address */
1122 0xfffff, /* length - all address space */
1123 SDT_MEMRWA, /* segment type */
1124 0, /* segment descriptor priority level */
1125 1, /* segment descriptor present */
1127 1, /* default 32 vs 16 bit size */
1128 1 /* limit granularity (byte/page units)*/ },
1129 /* GPRIV_SEL 3 SMP Per-Processor Private Data Descriptor */
1130 { 0x0, /* segment base address */
1131 0xfffff, /* length - all address space */
1132 SDT_MEMRWA, /* segment type */
1133 0, /* segment descriptor priority level */
1134 1, /* segment descriptor present */
1136 1, /* default 32 vs 16 bit size */
1137 1 /* limit granularity (byte/page units)*/ },
1138 /* GPROC0_SEL 4 Proc 0 Tss Descriptor */
1140 0x0, /* segment base address */
1141 sizeof(struct i386tss)-1,/* length - all address space */
1142 SDT_SYS386TSS, /* segment type */
1143 0, /* segment descriptor priority level */
1144 1, /* segment descriptor present */
1146 0, /* unused - default 32 vs 16 bit size */
1147 0 /* limit granularity (byte/page units)*/ },
1148 /* GLDT_SEL 5 LDT Descriptor */
1149 { (int) ldt, /* segment base address */
1150 sizeof(ldt)-1, /* length - all address space */
1151 SDT_SYSLDT, /* segment type */
1152 SEL_UPL, /* segment descriptor priority level */
1153 1, /* segment descriptor present */
1155 0, /* unused - default 32 vs 16 bit size */
1156 0 /* limit granularity (byte/page units)*/ },
1157 /* GUSERLDT_SEL 6 User LDT Descriptor per process */
1158 { (int) ldt, /* segment base address */
1159 (512 * sizeof(union descriptor)-1), /* length */
1160 SDT_SYSLDT, /* segment type */
1161 0, /* segment descriptor priority level */
1162 1, /* segment descriptor present */
1164 0, /* unused - default 32 vs 16 bit size */
1165 0 /* limit granularity (byte/page units)*/ },
1166 /* GTGATE_SEL 7 Null Descriptor - Placeholder */
1167 { 0x0, /* segment base address */
1168 0x0, /* length - all address space */
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 /* GBIOSLOWMEM_SEL 8 BIOS access to realmode segment 0x40, must be #8 in GDT */
1176 { 0x400, /* segment base address */
1177 0xfffff, /* length */
1178 SDT_MEMRWA, /* 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 /* GPANIC_SEL 9 Panic Tss Descriptor */
1185 { (int) &dblfault_tss, /* segment base address */
1186 sizeof(struct i386tss)-1,/* length - all address space */
1187 SDT_SYS386TSS, /* segment type */
1188 0, /* segment descriptor priority level */
1189 1, /* segment descriptor present */
1191 0, /* unused - default 32 vs 16 bit size */
1192 0 /* limit granularity (byte/page units)*/ },
1193 /* GBIOSCODE32_SEL 10 BIOS 32-bit interface (32bit Code) */
1194 { 0, /* segment base address (overwritten) */
1195 0xfffff, /* length */
1196 SDT_MEMERA, /* segment type */
1197 0, /* segment descriptor priority level */
1198 1, /* segment descriptor present */
1200 0, /* default 32 vs 16 bit size */
1201 1 /* limit granularity (byte/page units)*/ },
1202 /* GBIOSCODE16_SEL 11 BIOS 32-bit interface (16bit Code) */
1203 { 0, /* segment base address (overwritten) */
1204 0xfffff, /* length */
1205 SDT_MEMERA, /* segment type */
1206 0, /* segment descriptor priority level */
1207 1, /* segment descriptor present */
1209 0, /* default 32 vs 16 bit size */
1210 1 /* limit granularity (byte/page units)*/ },
1211 /* GBIOSDATA_SEL 12 BIOS 32-bit interface (Data) */
1212 { 0, /* segment base address (overwritten) */
1213 0xfffff, /* length */
1214 SDT_MEMRWA, /* segment type */
1215 0, /* segment descriptor priority level */
1216 1, /* segment descriptor present */
1218 1, /* default 32 vs 16 bit size */
1219 1 /* limit granularity (byte/page units)*/ },
1220 /* GBIOSUTIL_SEL 13 BIOS 16-bit interface (Utility) */
1221 { 0, /* segment base address (overwritten) */
1222 0xfffff, /* length */
1223 SDT_MEMRWA, /* segment type */
1224 0, /* segment descriptor priority level */
1225 1, /* segment descriptor present */
1227 0, /* default 32 vs 16 bit size */
1228 1 /* limit granularity (byte/page units)*/ },
1229 /* GBIOSARGS_SEL 14 BIOS 16-bit interface (Arguments) */
1230 { 0, /* segment base address (overwritten) */
1231 0xfffff, /* length */
1232 SDT_MEMRWA, /* segment type */
1233 0, /* segment descriptor priority level */
1234 1, /* segment descriptor present */
1236 0, /* default 32 vs 16 bit size */
1237 1 /* limit granularity (byte/page units)*/ },
1238 /* GTLS_START 15 TLS */
1239 { 0x0, /* segment base address */
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 /* GTLS_START+1 16 TLS */
1248 { 0x0, /* segment base address */
1250 0, /* segment type */
1251 0, /* segment descriptor priority level */
1252 0, /* segment descriptor present */
1254 0, /* default 32 vs 16 bit size */
1255 0 /* limit granularity (byte/page units)*/ },
1256 /* GTLS_END 17 TLS */
1257 { 0x0, /* segment base address */
1259 0, /* segment type */
1260 0, /* segment descriptor priority level */
1261 0, /* segment descriptor present */
1263 0, /* default 32 vs 16 bit size */
1264 0 /* limit granularity (byte/page units)*/ },
1267 static struct soft_segment_descriptor ldt_segs[] = {
1268 /* Null Descriptor - overwritten by call gate */
1269 { 0x0, /* segment base address */
1270 0x0, /* length - all address space */
1271 0, /* segment type */
1272 0, /* segment descriptor priority level */
1273 0, /* segment descriptor present */
1275 0, /* default 32 vs 16 bit size */
1276 0 /* limit granularity (byte/page units)*/ },
1277 /* Null Descriptor - overwritten by call gate */
1278 { 0x0, /* segment base address */
1279 0x0, /* length - all address space */
1280 0, /* segment type */
1281 0, /* segment descriptor priority level */
1282 0, /* segment descriptor present */
1284 0, /* default 32 vs 16 bit size */
1285 0 /* limit granularity (byte/page units)*/ },
1286 /* Null Descriptor - overwritten by call gate */
1287 { 0x0, /* segment base address */
1288 0x0, /* length - all address space */
1289 0, /* segment type */
1290 0, /* segment descriptor priority level */
1291 0, /* segment descriptor present */
1293 0, /* default 32 vs 16 bit size */
1294 0 /* limit granularity (byte/page units)*/ },
1295 /* Code Descriptor for user */
1296 { 0x0, /* segment base address */
1297 0xfffff, /* length - all address space */
1298 SDT_MEMERA, /* segment type */
1299 SEL_UPL, /* segment descriptor priority level */
1300 1, /* segment descriptor present */
1302 1, /* default 32 vs 16 bit size */
1303 1 /* limit granularity (byte/page units)*/ },
1304 /* Null Descriptor - overwritten by call gate */
1305 { 0x0, /* segment base address */
1306 0x0, /* length - all address space */
1307 0, /* segment type */
1308 0, /* segment descriptor priority level */
1309 0, /* segment descriptor present */
1311 0, /* default 32 vs 16 bit size */
1312 0 /* limit granularity (byte/page units)*/ },
1313 /* Data Descriptor for user */
1314 { 0x0, /* segment base address */
1315 0xfffff, /* length - all address space */
1316 SDT_MEMRWA, /* segment type */
1317 SEL_UPL, /* segment descriptor priority level */
1318 1, /* segment descriptor present */
1320 1, /* default 32 vs 16 bit size */
1321 1 /* limit granularity (byte/page units)*/ },
1325 setidt(int idx, inthand_t *func, int typ, int dpl, int selec)
1327 struct gate_descriptor *ip;
1330 ip->gd_looffset = (int)func;
1331 ip->gd_selector = selec;
1337 ip->gd_hioffset = ((int)func)>>16 ;
1340 #define IDTVEC(name) __CONCAT(X,name)
1343 IDTVEC(div), IDTVEC(dbg), IDTVEC(nmi), IDTVEC(bpt), IDTVEC(ofl),
1344 IDTVEC(bnd), IDTVEC(ill), IDTVEC(dna), IDTVEC(fpusegm),
1345 IDTVEC(tss), IDTVEC(missing), IDTVEC(stk), IDTVEC(prot),
1346 IDTVEC(page), IDTVEC(mchk), IDTVEC(fpu), IDTVEC(align),
1347 IDTVEC(xmm), IDTVEC(syscall),
1350 IDTVEC(int0x80_syscall);
1352 #ifdef DEBUG_INTERRUPTS
1353 extern inthand_t *Xrsvdary[256];
1357 sdtossd(struct segment_descriptor *sd, struct soft_segment_descriptor *ssd)
1359 ssd->ssd_base = (sd->sd_hibase << 24) | sd->sd_lobase;
1360 ssd->ssd_limit = (sd->sd_hilimit << 16) | sd->sd_lolimit;
1361 ssd->ssd_type = sd->sd_type;
1362 ssd->ssd_dpl = sd->sd_dpl;
1363 ssd->ssd_p = sd->sd_p;
1364 ssd->ssd_def32 = sd->sd_def32;
1365 ssd->ssd_gran = sd->sd_gran;
1369 * Populate the (physmap) array with base/bound pairs describing the
1370 * available physical memory in the system, then test this memory and
1371 * build the phys_avail array describing the actually-available memory.
1373 * If we cannot accurately determine the physical memory map, then use
1374 * value from the 0xE801 call, and failing that, the RTC.
1376 * Total memory size may be set by the kernel environment variable
1377 * hw.physmem or the compile-time define MAXMEM.
1380 getmemsize(int first)
1382 int i, physmap_idx, pa_indx;
1384 u_int basemem, extmem;
1385 struct vm86frame vmf;
1386 struct vm86context vmc;
1388 vm_offset_t physmap[PHYSMAP_ENTRIES*2];
1396 quad_t dcons_addr, dcons_size;
1399 TUNABLE_INT_FETCH("hw.hasbrokenint12", &hasbrokenint12);
1400 bzero(&vmf, sizeof(struct vm86frame));
1401 bzero(physmap, sizeof(physmap));
1405 * Some newer BIOSes has broken INT 12H implementation which cause
1406 * kernel panic immediately. In this case, we need to scan SMAP
1407 * with INT 15:E820 first, then determine base memory size.
1409 if (hasbrokenint12) {
1414 * Perform "base memory" related probes & setup. If we get a crazy
1415 * value give the bios some scribble space just in case.
1417 vm86_intcall(0x12, &vmf);
1418 basemem = vmf.vmf_ax;
1419 if (basemem > 640) {
1420 kprintf("Preposterous BIOS basemem of %uK, "
1421 "truncating to < 640K\n", basemem);
1426 * XXX if biosbasemem is now < 640, there is a `hole'
1427 * between the end of base memory and the start of
1428 * ISA memory. The hole may be empty or it may
1429 * contain BIOS code or data. Map it read/write so
1430 * that the BIOS can write to it. (Memory from 0 to
1431 * the physical end of the kernel is mapped read-only
1432 * to begin with and then parts of it are remapped.
1433 * The parts that aren't remapped form holes that
1434 * remain read-only and are unused by the kernel.
1435 * The base memory area is below the physical end of
1436 * the kernel and right now forms a read-only hole.
1437 * The part of it from PAGE_SIZE to
1438 * (trunc_page(biosbasemem * 1024) - 1) will be
1439 * remapped and used by the kernel later.)
1441 * This code is similar to the code used in
1442 * pmap_mapdev, but since no memory needs to be
1443 * allocated we simply change the mapping.
1445 for (pa = trunc_page(basemem * 1024);
1446 pa < ISA_HOLE_START; pa += PAGE_SIZE) {
1447 pte = vtopte(pa + KERNBASE);
1448 *pte = pa | PG_RW | PG_V;
1452 * if basemem != 640, map pages r/w into vm86 page table so
1453 * that the bios can scribble on it.
1456 for (i = basemem / 4; i < 160; i++)
1457 pte[i] = (i << PAGE_SHIFT) | PG_V | PG_RW | PG_U;
1461 * map page 1 R/W into the kernel page table so we can use it
1462 * as a buffer. The kernel will unmap this page later.
1464 pte = vtopte(KERNBASE + (1 << PAGE_SHIFT));
1465 *pte = (1 << PAGE_SHIFT) | PG_RW | PG_V;
1468 * get memory map with INT 15:E820
1470 #define SMAPSIZ sizeof(*smap)
1471 #define SMAP_SIG 0x534D4150 /* 'SMAP' */
1474 smap = (void *)vm86_addpage(&vmc, 1, KERNBASE + (1 << PAGE_SHIFT));
1475 vm86_getptr(&vmc, (vm_offset_t)smap, &vmf.vmf_es, &vmf.vmf_di);
1480 vmf.vmf_eax = 0xE820;
1481 vmf.vmf_edx = SMAP_SIG;
1482 vmf.vmf_ecx = SMAPSIZ;
1483 i = vm86_datacall(0x15, &vmf, &vmc);
1484 if (i || vmf.vmf_eax != SMAP_SIG)
1486 if (boothowto & RB_VERBOSE)
1487 kprintf("SMAP type=%02x base=%08x %08x len=%08x %08x\n",
1489 *(u_int32_t *)((char *)&smap->base + 4),
1490 (u_int32_t)smap->base,
1491 *(u_int32_t *)((char *)&smap->length + 4),
1492 (u_int32_t)smap->length);
1494 if (smap->type != 0x01)
1497 if (smap->length == 0)
1500 if (smap->base >= 0xffffffff) {
1501 kprintf("%uK of memory above 4GB ignored\n",
1502 (u_int)(smap->length / 1024));
1506 for (i = 0; i <= physmap_idx; i += 2) {
1507 if (smap->base < physmap[i + 1]) {
1508 if (boothowto & RB_VERBOSE)
1510 "Overlapping or non-montonic memory region, ignoring second region\n");
1515 if (smap->base == physmap[physmap_idx + 1]) {
1516 physmap[physmap_idx + 1] += smap->length;
1521 if (physmap_idx == PHYSMAP_ENTRIES*2) {
1523 "Too many segments in the physical address map, giving up\n");
1526 physmap[physmap_idx] = smap->base;
1527 physmap[physmap_idx + 1] = smap->base + smap->length;
1529 ; /* fix GCC3.x warning */
1530 } while (vmf.vmf_ebx != 0);
1533 * Perform "base memory" related probes & setup based on SMAP
1536 for (i = 0; i <= physmap_idx; i += 2) {
1537 if (physmap[i] == 0x00000000) {
1538 basemem = physmap[i + 1] / 1024;
1547 if (basemem > 640) {
1548 kprintf("Preposterous BIOS basemem of %uK, truncating to 640K\n",
1553 for (pa = trunc_page(basemem * 1024);
1554 pa < ISA_HOLE_START; pa += PAGE_SIZE) {
1555 pte = vtopte(pa + KERNBASE);
1556 *pte = pa | PG_RW | PG_V;
1560 for (i = basemem / 4; i < 160; i++)
1561 pte[i] = (i << PAGE_SHIFT) | PG_V | PG_RW | PG_U;
1564 if (physmap[1] != 0)
1568 * If we failed above, try memory map with INT 15:E801
1570 vmf.vmf_ax = 0xE801;
1571 if (vm86_intcall(0x15, &vmf) == 0) {
1572 extmem = vmf.vmf_cx + vmf.vmf_dx * 64;
1576 vm86_intcall(0x15, &vmf);
1577 extmem = vmf.vmf_ax;
1580 * Prefer the RTC value for extended memory.
1582 extmem = rtcin(RTC_EXTLO) + (rtcin(RTC_EXTHI) << 8);
1587 * Special hack for chipsets that still remap the 384k hole when
1588 * there's 16MB of memory - this really confuses people that
1589 * are trying to use bus mastering ISA controllers with the
1590 * "16MB limit"; they only have 16MB, but the remapping puts
1591 * them beyond the limit.
1593 * If extended memory is between 15-16MB (16-17MB phys address range),
1596 if ((extmem > 15 * 1024) && (extmem < 16 * 1024))
1600 physmap[1] = basemem * 1024;
1602 physmap[physmap_idx] = 0x100000;
1603 physmap[physmap_idx + 1] = physmap[physmap_idx] + extmem * 1024;
1607 * Now, physmap contains a map of physical memory.
1611 /* make hole for AP bootstrap code YYY */
1612 physmap[1] = mp_bootaddress(physmap[1] / 1024);
1614 /* look for the MP hardware - needed for apic addresses */
1619 * Maxmem isn't the "maximum memory", it's one larger than the
1620 * highest page of the physical address space. It should be
1621 * called something like "Maxphyspage". We may adjust this
1622 * based on ``hw.physmem'' and the results of the memory test.
1624 Maxmem = atop(physmap[physmap_idx + 1]);
1627 Maxmem = MAXMEM / 4;
1631 * hw.physmem is a size in bytes; we also allow k, m, and g suffixes
1632 * for the appropriate modifiers. This overrides MAXMEM.
1634 if ((cp = kgetenv("hw.physmem")) != NULL) {
1635 u_int64_t AllowMem, sanity;
1638 sanity = AllowMem = strtouq(cp, &ep, 0);
1639 if ((ep != cp) && (*ep != 0)) {
1652 AllowMem = sanity = 0;
1654 if (AllowMem < sanity)
1658 kprintf("Ignoring invalid memory size of '%s'\n", cp);
1660 Maxmem = atop(AllowMem);
1663 if (atop(physmap[physmap_idx + 1]) != Maxmem &&
1664 (boothowto & RB_VERBOSE))
1665 kprintf("Physical memory use set to %lluK\n", Maxmem * 4);
1668 * If Maxmem has been increased beyond what the system has detected,
1669 * extend the last memory segment to the new limit.
1671 if (atop(physmap[physmap_idx + 1]) < Maxmem)
1672 physmap[physmap_idx + 1] = ptoa(Maxmem);
1674 /* call pmap initialization to make new kernel address space */
1675 pmap_bootstrap(first, 0);
1678 * Size up each available chunk of physical memory.
1680 physmap[0] = PAGE_SIZE; /* mask off page 0 */
1682 phys_avail[pa_indx++] = physmap[0];
1683 phys_avail[pa_indx] = physmap[0];
1687 * Get dcons buffer address
1689 if (kgetenv_quad("dcons.addr", &dcons_addr) == 0 ||
1690 kgetenv_quad("dcons.size", &dcons_size) == 0)
1694 * physmap is in bytes, so when converting to page boundaries,
1695 * round up the start address and round down the end address.
1697 for (i = 0; i <= physmap_idx; i += 2) {
1701 if (physmap[i + 1] < end)
1702 end = trunc_page(physmap[i + 1]);
1703 for (pa = round_page(physmap[i]); pa < end; pa += PAGE_SIZE) {
1708 int *ptr = (int *)CADDR1;
1712 * block out kernel memory as not available.
1714 if (pa >= 0x100000 && pa < first)
1718 * block out dcons buffer
1721 && pa >= trunc_page(dcons_addr)
1722 && pa < dcons_addr + dcons_size)
1728 * map page into kernel: valid, read/write,non-cacheable
1730 *pte = pa | PG_V | PG_RW | PG_N;
1735 * Test for alternating 1's and 0's
1737 *(volatile int *)ptr = 0xaaaaaaaa;
1738 if (*(volatile int *)ptr != 0xaaaaaaaa) {
1742 * Test for alternating 0's and 1's
1744 *(volatile int *)ptr = 0x55555555;
1745 if (*(volatile int *)ptr != 0x55555555) {
1751 *(volatile int *)ptr = 0xffffffff;
1752 if (*(volatile int *)ptr != 0xffffffff) {
1758 *(volatile int *)ptr = 0x0;
1759 if (*(volatile int *)ptr != 0x0) {
1763 * Restore original value.
1768 * Adjust array of valid/good pages.
1770 if (page_bad == TRUE) {
1774 * If this good page is a continuation of the
1775 * previous set of good pages, then just increase
1776 * the end pointer. Otherwise start a new chunk.
1777 * Note that "end" points one higher than end,
1778 * making the range >= start and < end.
1779 * If we're also doing a speculative memory
1780 * test and we at or past the end, bump up Maxmem
1781 * so that we keep going. The first bad page
1782 * will terminate the loop.
1784 if (phys_avail[pa_indx] == pa) {
1785 phys_avail[pa_indx] += PAGE_SIZE;
1788 if (pa_indx >= PHYSMAP_ENTRIES*2) {
1789 kprintf("Too many holes in the physical address space, giving up\n");
1793 phys_avail[pa_indx++] = pa; /* start */
1794 phys_avail[pa_indx] = pa + PAGE_SIZE; /* end */
1804 * The last chunk must contain at least one page plus the message
1805 * buffer to avoid complicating other code (message buffer address
1806 * calculation, etc.).
1808 while (phys_avail[pa_indx - 1] + PAGE_SIZE +
1809 round_page(MSGBUF_SIZE) >= phys_avail[pa_indx]) {
1810 physmem -= atop(phys_avail[pa_indx] - phys_avail[pa_indx - 1]);
1811 phys_avail[pa_indx--] = 0;
1812 phys_avail[pa_indx--] = 0;
1815 Maxmem = atop(phys_avail[pa_indx]);
1817 /* Trim off space for the message buffer. */
1818 phys_avail[pa_indx] -= round_page(MSGBUF_SIZE);
1820 avail_end = phys_avail[pa_indx];
1832 * 7 Device Not Available (x87)
1834 * 9 Coprocessor Segment overrun (unsupported, reserved)
1836 * 11 Segment not present
1838 * 13 General Protection
1841 * 16 x87 FP Exception pending
1842 * 17 Alignment Check
1844 * 19 SIMD floating point
1846 * 32-255 INTn/external sources
1851 struct gate_descriptor *gdp;
1852 int gsel_tss, metadata_missing, off, x;
1853 struct mdglobaldata *gd;
1856 * Prevent lowering of the ipl if we call tsleep() early.
1858 gd = &CPU_prvspace[0].mdglobaldata;
1859 bzero(gd, sizeof(*gd));
1861 gd->mi.gd_curthread = &thread0;
1862 thread0.td_gd = &gd->mi;
1864 atdevbase = ISA_HOLE_START + KERNBASE;
1866 metadata_missing = 0;
1867 if (bootinfo.bi_modulep) {
1868 preload_metadata = (caddr_t)bootinfo.bi_modulep + KERNBASE;
1869 preload_bootstrap_relocate(KERNBASE);
1871 metadata_missing = 1;
1873 if (bootinfo.bi_envp)
1874 kern_envp = (caddr_t)bootinfo.bi_envp + KERNBASE;
1877 * start with one cpu. Note: ncpus2_shift and ncpus2_mask are left
1882 /* Init basic tunables, hz etc */
1886 * make gdt memory segments, the code segment goes up to end of the
1887 * page with etext in it, the data segment goes to the end of
1891 * XXX text protection is temporarily (?) disabled. The limit was
1892 * i386_btop(round_page(etext)) - 1.
1894 gdt_segs[GCODE_SEL].ssd_limit = atop(0 - 1);
1895 gdt_segs[GDATA_SEL].ssd_limit = atop(0 - 1);
1897 gdt_segs[GPRIV_SEL].ssd_limit =
1898 atop(sizeof(struct privatespace) - 1);
1899 gdt_segs[GPRIV_SEL].ssd_base = (int) &CPU_prvspace[0];
1900 gdt_segs[GPROC0_SEL].ssd_base =
1901 (int) &CPU_prvspace[0].mdglobaldata.gd_common_tss;
1903 gd->mi.gd_prvspace = &CPU_prvspace[0];
1906 * Note: on both UP and SMP curthread must be set non-NULL
1907 * early in the boot sequence because the system assumes
1908 * that 'curthread' is never NULL.
1911 for (x = 0; x < NGDT; x++) {
1913 /* avoid overwriting db entries with APM ones */
1914 if (x >= GAPMCODE32_SEL && x <= GAPMDATA_SEL)
1917 ssdtosd(&gdt_segs[x], &gdt[x].sd);
1920 r_gdt.rd_limit = NGDT * sizeof(gdt[0]) - 1;
1921 r_gdt.rd_base = (int) gdt;
1924 mi_gdinit(&gd->mi, 0);
1926 mi_proc0init(&gd->mi, proc0paddr);
1927 safepri = TDPRI_MAX;
1929 /* make ldt memory segments */
1931 * XXX - VM_MAX_USER_ADDRESS is an end address, not a max. And it
1932 * should be spelled ...MAX_USER...
1934 ldt_segs[LUCODE_SEL].ssd_limit = atop(VM_MAX_USER_ADDRESS - 1);
1935 ldt_segs[LUDATA_SEL].ssd_limit = atop(VM_MAX_USER_ADDRESS - 1);
1936 for (x = 0; x < sizeof ldt_segs / sizeof ldt_segs[0]; x++)
1937 ssdtosd(&ldt_segs[x], &ldt[x].sd);
1939 _default_ldt = GSEL(GLDT_SEL, SEL_KPL);
1941 gd->gd_currentldt = _default_ldt;
1942 /* spinlocks and the BGL */
1946 * Setup the hardware exception table. Most exceptions use
1947 * SDT_SYS386TGT, known as a 'trap gate'. Trap gates leave
1948 * interrupts enabled. VM page faults use SDT_SYS386IGT, known as
1949 * an 'interrupt trap gate', which disables interrupts on entry,
1950 * in order to be able to poll the appropriate CRn register to
1951 * determine the fault address.
1953 for (x = 0; x < NIDT; x++) {
1954 #ifdef DEBUG_INTERRUPTS
1955 setidt(x, Xrsvdary[x], SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1957 setidt(x, &IDTVEC(rsvd0), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1960 setidt(0, &IDTVEC(div), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1961 setidt(1, &IDTVEC(dbg), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1962 setidt(2, &IDTVEC(nmi), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1963 setidt(3, &IDTVEC(bpt), SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL));
1964 setidt(4, &IDTVEC(ofl), SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL));
1965 setidt(5, &IDTVEC(bnd), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1966 setidt(6, &IDTVEC(ill), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1967 setidt(7, &IDTVEC(dna), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1968 setidt(8, 0, SDT_SYSTASKGT, SEL_KPL, GSEL(GPANIC_SEL, SEL_KPL));
1969 setidt(9, &IDTVEC(fpusegm), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1970 setidt(10, &IDTVEC(tss), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1971 setidt(11, &IDTVEC(missing), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1972 setidt(12, &IDTVEC(stk), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1973 setidt(13, &IDTVEC(prot), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1974 setidt(14, &IDTVEC(page), SDT_SYS386IGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1975 setidt(15, &IDTVEC(rsvd0), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1976 setidt(16, &IDTVEC(fpu), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1977 setidt(17, &IDTVEC(align), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1978 setidt(18, &IDTVEC(mchk), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1979 setidt(19, &IDTVEC(xmm), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1980 setidt(0x80, &IDTVEC(int0x80_syscall),
1981 SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL));
1983 r_idt.rd_limit = sizeof(idt0) - 1;
1984 r_idt.rd_base = (int) idt;
1988 * Initialize the console before we print anything out.
1992 if (metadata_missing)
1993 kprintf("WARNING: loader(8) metadata is missing!\n");
2002 if (boothowto & RB_KDB)
2003 Debugger("Boot flags requested debugger");
2006 finishidentcpu(); /* Final stage of CPU initialization */
2007 setidt(6, &IDTVEC(ill), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
2008 setidt(13, &IDTVEC(prot), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
2009 initializecpu(); /* Initialize CPU registers */
2012 * make an initial tss so cpu can get interrupt stack on syscall!
2013 * The 16 bytes is to save room for a VM86 context.
2015 gd->gd_common_tss.tss_esp0 = (int) thread0.td_pcb - 16;
2016 gd->gd_common_tss.tss_ss0 = GSEL(GDATA_SEL, SEL_KPL) ;
2017 gsel_tss = GSEL(GPROC0_SEL, SEL_KPL);
2018 gd->gd_tss_gdt = &gdt[GPROC0_SEL].sd;
2019 gd->gd_common_tssd = *gd->gd_tss_gdt;
2020 gd->gd_common_tss.tss_ioopt = (sizeof gd->gd_common_tss) << 16;
2023 dblfault_tss.tss_esp = dblfault_tss.tss_esp0 = dblfault_tss.tss_esp1 =
2024 dblfault_tss.tss_esp2 = (int) &dblfault_stack[sizeof(dblfault_stack)];
2025 dblfault_tss.tss_ss = dblfault_tss.tss_ss0 = dblfault_tss.tss_ss1 =
2026 dblfault_tss.tss_ss2 = GSEL(GDATA_SEL, SEL_KPL);
2027 dblfault_tss.tss_cr3 = (int)IdlePTD;
2028 dblfault_tss.tss_eip = (int) dblfault_handler;
2029 dblfault_tss.tss_eflags = PSL_KERNEL;
2030 dblfault_tss.tss_ds = dblfault_tss.tss_es =
2031 dblfault_tss.tss_gs = GSEL(GDATA_SEL, SEL_KPL);
2032 dblfault_tss.tss_fs = GSEL(GPRIV_SEL, SEL_KPL);
2033 dblfault_tss.tss_cs = GSEL(GCODE_SEL, SEL_KPL);
2034 dblfault_tss.tss_ldt = GSEL(GLDT_SEL, SEL_KPL);
2038 init_param2(physmem);
2040 /* now running on new page tables, configured,and u/iom is accessible */
2042 /* Map the message buffer. */
2043 for (off = 0; off < round_page(MSGBUF_SIZE); off += PAGE_SIZE)
2044 pmap_kenter((vm_offset_t)msgbufp + off, avail_end + off);
2046 msgbufinit(msgbufp, MSGBUF_SIZE);
2048 /* make a call gate to reenter kernel with */
2049 gdp = &ldt[LSYS5CALLS_SEL].gd;
2051 x = (int) &IDTVEC(syscall);
2052 gdp->gd_looffset = x++;
2053 gdp->gd_selector = GSEL(GCODE_SEL,SEL_KPL);
2055 gdp->gd_type = SDT_SYS386CGT;
2056 gdp->gd_dpl = SEL_UPL;
2058 gdp->gd_hioffset = ((int) &IDTVEC(syscall)) >>16;
2060 /* XXX does this work? */
2061 ldt[LBSDICALLS_SEL] = ldt[LSYS5CALLS_SEL];
2062 ldt[LSOL26CALLS_SEL] = ldt[LSYS5CALLS_SEL];
2064 /* transfer to user mode */
2066 _ucodesel = LSEL(LUCODE_SEL, SEL_UPL);
2067 _udatasel = LSEL(LUDATA_SEL, SEL_UPL);
2069 /* setup proc 0's pcb */
2070 thread0.td_pcb->pcb_flags = 0;
2071 thread0.td_pcb->pcb_cr3 = (int)IdlePTD; /* should already be setup */
2072 thread0.td_pcb->pcb_ext = 0;
2073 proc0.p_lwp.lwp_md.md_regs = &proc0_tf;
2077 * Initialize machine-dependant portions of the global data structure.
2078 * Note that the global data area and cpu0's idlestack in the private
2079 * data space were allocated in locore.
2081 * Note: the idlethread's cpl is 0
2083 * WARNING! Called from early boot, 'mycpu' may not work yet.
2086 cpu_gdinit(struct mdglobaldata *gd, int cpu)
2089 gd->mi.gd_curthread = &gd->mi.gd_idlethread;
2091 lwkt_init_thread(&gd->mi.gd_idlethread,
2092 gd->mi.gd_prvspace->idlestack,
2093 sizeof(gd->mi.gd_prvspace->idlestack),
2094 TDF_MPSAFE, &gd->mi);
2095 lwkt_set_comm(&gd->mi.gd_idlethread, "idle_%d", cpu);
2096 gd->mi.gd_idlethread.td_switch = cpu_lwkt_switch;
2097 gd->mi.gd_idlethread.td_sp -= sizeof(void *);
2098 *(void **)gd->mi.gd_idlethread.td_sp = cpu_idle_restore;
2102 is_globaldata_space(vm_offset_t saddr, vm_offset_t eaddr)
2104 if (saddr >= (vm_offset_t)&CPU_prvspace[0] &&
2105 eaddr <= (vm_offset_t)&CPU_prvspace[MAXCPU]) {
2112 globaldata_find(int cpu)
2114 KKASSERT(cpu >= 0 && cpu < ncpus);
2115 return(&CPU_prvspace[cpu].mdglobaldata.mi);
2118 #if defined(I586_CPU) && !defined(NO_F00F_HACK)
2119 static void f00f_hack(void *unused);
2120 SYSINIT(f00f_hack, SI_SUB_INTRINSIC, SI_ORDER_FIRST, f00f_hack, NULL);
2123 f00f_hack(void *unused)
2125 struct gate_descriptor *new_idt;
2131 kprintf("Intel Pentium detected, installing workaround for F00F bug\n");
2133 r_idt.rd_limit = sizeof(idt0) - 1;
2135 tmp = kmem_alloc(&kernel_map, PAGE_SIZE * 2);
2137 panic("kmem_alloc returned 0");
2138 if (((unsigned int)tmp & (PAGE_SIZE-1)) != 0)
2139 panic("kmem_alloc returned non-page-aligned memory");
2140 /* Put the first seven entries in the lower page */
2141 new_idt = (struct gate_descriptor*)(tmp + PAGE_SIZE - (7*8));
2142 bcopy(idt, new_idt, sizeof(idt0));
2143 r_idt.rd_base = (int)new_idt;
2146 if (vm_map_protect(&kernel_map, tmp, tmp + PAGE_SIZE,
2147 VM_PROT_READ, FALSE) != KERN_SUCCESS)
2148 panic("vm_map_protect failed");
2151 #endif /* defined(I586_CPU) && !NO_F00F_HACK */
2154 ptrace_set_pc(struct proc *p, unsigned long addr)
2156 p->p_md.md_regs->tf_eip = addr;
2161 ptrace_single_step(struct lwp *lp)
2163 lp->lwp_md.md_regs->tf_eflags |= PSL_T;
2168 fill_regs(struct lwp *lp, struct reg *regs)
2171 struct trapframe *tp;
2173 tp = lp->lwp_md.md_regs;
2174 regs->r_gs = tp->tf_gs;
2175 regs->r_fs = tp->tf_fs;
2176 regs->r_es = tp->tf_es;
2177 regs->r_ds = tp->tf_ds;
2178 regs->r_edi = tp->tf_edi;
2179 regs->r_esi = tp->tf_esi;
2180 regs->r_ebp = tp->tf_ebp;
2181 regs->r_ebx = tp->tf_ebx;
2182 regs->r_edx = tp->tf_edx;
2183 regs->r_ecx = tp->tf_ecx;
2184 regs->r_eax = tp->tf_eax;
2185 regs->r_eip = tp->tf_eip;
2186 regs->r_cs = tp->tf_cs;
2187 regs->r_eflags = tp->tf_eflags;
2188 regs->r_esp = tp->tf_esp;
2189 regs->r_ss = tp->tf_ss;
2190 pcb = lp->lwp_thread->td_pcb;
2195 set_regs(struct lwp *lp, struct reg *regs)
2198 struct trapframe *tp;
2200 tp = lp->lwp_md.md_regs;
2201 if (!EFL_SECURE(regs->r_eflags, tp->tf_eflags) ||
2202 !CS_SECURE(regs->r_cs))
2204 tp->tf_gs = regs->r_gs;
2205 tp->tf_fs = regs->r_fs;
2206 tp->tf_es = regs->r_es;
2207 tp->tf_ds = regs->r_ds;
2208 tp->tf_edi = regs->r_edi;
2209 tp->tf_esi = regs->r_esi;
2210 tp->tf_ebp = regs->r_ebp;
2211 tp->tf_ebx = regs->r_ebx;
2212 tp->tf_edx = regs->r_edx;
2213 tp->tf_ecx = regs->r_ecx;
2214 tp->tf_eax = regs->r_eax;
2215 tp->tf_eip = regs->r_eip;
2216 tp->tf_cs = regs->r_cs;
2217 tp->tf_eflags = regs->r_eflags;
2218 tp->tf_esp = regs->r_esp;
2219 tp->tf_ss = regs->r_ss;
2220 pcb = lp->lwp_thread->td_pcb;
2224 #ifndef CPU_DISABLE_SSE
2226 fill_fpregs_xmm(struct savexmm *sv_xmm, struct save87 *sv_87)
2228 struct env87 *penv_87 = &sv_87->sv_env;
2229 struct envxmm *penv_xmm = &sv_xmm->sv_env;
2232 /* FPU control/status */
2233 penv_87->en_cw = penv_xmm->en_cw;
2234 penv_87->en_sw = penv_xmm->en_sw;
2235 penv_87->en_tw = penv_xmm->en_tw;
2236 penv_87->en_fip = penv_xmm->en_fip;
2237 penv_87->en_fcs = penv_xmm->en_fcs;
2238 penv_87->en_opcode = penv_xmm->en_opcode;
2239 penv_87->en_foo = penv_xmm->en_foo;
2240 penv_87->en_fos = penv_xmm->en_fos;
2243 for (i = 0; i < 8; ++i)
2244 sv_87->sv_ac[i] = sv_xmm->sv_fp[i].fp_acc;
2246 sv_87->sv_ex_sw = sv_xmm->sv_ex_sw;
2250 set_fpregs_xmm(struct save87 *sv_87, struct savexmm *sv_xmm)
2252 struct env87 *penv_87 = &sv_87->sv_env;
2253 struct envxmm *penv_xmm = &sv_xmm->sv_env;
2256 /* FPU control/status */
2257 penv_xmm->en_cw = penv_87->en_cw;
2258 penv_xmm->en_sw = penv_87->en_sw;
2259 penv_xmm->en_tw = penv_87->en_tw;
2260 penv_xmm->en_fip = penv_87->en_fip;
2261 penv_xmm->en_fcs = penv_87->en_fcs;
2262 penv_xmm->en_opcode = penv_87->en_opcode;
2263 penv_xmm->en_foo = penv_87->en_foo;
2264 penv_xmm->en_fos = penv_87->en_fos;
2267 for (i = 0; i < 8; ++i)
2268 sv_xmm->sv_fp[i].fp_acc = sv_87->sv_ac[i];
2270 sv_xmm->sv_ex_sw = sv_87->sv_ex_sw;
2272 #endif /* CPU_DISABLE_SSE */
2275 fill_fpregs(struct lwp *lp, struct fpreg *fpregs)
2277 #ifndef CPU_DISABLE_SSE
2279 fill_fpregs_xmm(&lp->lwp_thread->td_pcb->pcb_save.sv_xmm,
2280 (struct save87 *)fpregs);
2283 #endif /* CPU_DISABLE_SSE */
2284 bcopy(&lp->lwp_thread->td_pcb->pcb_save.sv_87, fpregs, sizeof *fpregs);
2289 set_fpregs(struct lwp *lp, struct fpreg *fpregs)
2291 #ifndef CPU_DISABLE_SSE
2293 set_fpregs_xmm((struct save87 *)fpregs,
2294 &lp->lwp_thread->td_pcb->pcb_save.sv_xmm);
2297 #endif /* CPU_DISABLE_SSE */
2298 bcopy(fpregs, &lp->lwp_thread->td_pcb->pcb_save.sv_87, sizeof *fpregs);
2303 fill_dbregs(struct lwp *lp, struct dbreg *dbregs)
2306 dbregs->dr0 = rdr0();
2307 dbregs->dr1 = rdr1();
2308 dbregs->dr2 = rdr2();
2309 dbregs->dr3 = rdr3();
2310 dbregs->dr4 = rdr4();
2311 dbregs->dr5 = rdr5();
2312 dbregs->dr6 = rdr6();
2313 dbregs->dr7 = rdr7();
2317 pcb = lp->lwp_thread->td_pcb;
2318 dbregs->dr0 = pcb->pcb_dr0;
2319 dbregs->dr1 = pcb->pcb_dr1;
2320 dbregs->dr2 = pcb->pcb_dr2;
2321 dbregs->dr3 = pcb->pcb_dr3;
2324 dbregs->dr6 = pcb->pcb_dr6;
2325 dbregs->dr7 = pcb->pcb_dr7;
2331 set_dbregs(struct lwp *lp, struct dbreg *dbregs)
2334 load_dr0(dbregs->dr0);
2335 load_dr1(dbregs->dr1);
2336 load_dr2(dbregs->dr2);
2337 load_dr3(dbregs->dr3);
2338 load_dr4(dbregs->dr4);
2339 load_dr5(dbregs->dr5);
2340 load_dr6(dbregs->dr6);
2341 load_dr7(dbregs->dr7);
2344 struct ucred *ucred;
2346 uint32_t mask1, mask2;
2349 * Don't let an illegal value for dr7 get set. Specifically,
2350 * check for undefined settings. Setting these bit patterns
2351 * result in undefined behaviour and can lead to an unexpected
2354 for (i = 0, mask1 = 0x3<<16, mask2 = 0x2<<16; i < 8;
2355 i++, mask1 <<= 2, mask2 <<= 2)
2356 if ((dbregs->dr7 & mask1) == mask2)
2359 pcb = lp->lwp_thread->td_pcb;
2360 ucred = lp->lwp_proc->p_ucred;
2363 * Don't let a process set a breakpoint that is not within the
2364 * process's address space. If a process could do this, it
2365 * could halt the system by setting a breakpoint in the kernel
2366 * (if ddb was enabled). Thus, we need to check to make sure
2367 * that no breakpoints are being enabled for addresses outside
2368 * process's address space, unless, perhaps, we were called by
2371 * XXX - what about when the watched area of the user's
2372 * address space is written into from within the kernel
2373 * ... wouldn't that still cause a breakpoint to be generated
2374 * from within kernel mode?
2377 if (suser_cred(ucred, 0) != 0) {
2378 if (dbregs->dr7 & 0x3) {
2379 /* dr0 is enabled */
2380 if (dbregs->dr0 >= VM_MAX_USER_ADDRESS)
2384 if (dbregs->dr7 & (0x3<<2)) {
2385 /* dr1 is enabled */
2386 if (dbregs->dr1 >= VM_MAX_USER_ADDRESS)
2390 if (dbregs->dr7 & (0x3<<4)) {
2391 /* dr2 is enabled */
2392 if (dbregs->dr2 >= VM_MAX_USER_ADDRESS)
2396 if (dbregs->dr7 & (0x3<<6)) {
2397 /* dr3 is enabled */
2398 if (dbregs->dr3 >= VM_MAX_USER_ADDRESS)
2403 pcb->pcb_dr0 = dbregs->dr0;
2404 pcb->pcb_dr1 = dbregs->dr1;
2405 pcb->pcb_dr2 = dbregs->dr2;
2406 pcb->pcb_dr3 = dbregs->dr3;
2407 pcb->pcb_dr6 = dbregs->dr6;
2408 pcb->pcb_dr7 = dbregs->dr7;
2410 pcb->pcb_flags |= PCB_DBREGS;
2417 * Return > 0 if a hardware breakpoint has been hit, and the
2418 * breakpoint was in user space. Return 0, otherwise.
2421 user_dbreg_trap(void)
2423 u_int32_t dr7, dr6; /* debug registers dr6 and dr7 */
2424 u_int32_t bp; /* breakpoint bits extracted from dr6 */
2425 int nbp; /* number of breakpoints that triggered */
2426 caddr_t addr[4]; /* breakpoint addresses */
2430 if ((dr7 & 0x000000ff) == 0) {
2432 * all GE and LE bits in the dr7 register are zero,
2433 * thus the trap couldn't have been caused by the
2434 * hardware debug registers
2441 bp = dr6 & 0x0000000f;
2445 * None of the breakpoint bits are set meaning this
2446 * trap was not caused by any of the debug registers
2452 * at least one of the breakpoints were hit, check to see
2453 * which ones and if any of them are user space addresses
2457 addr[nbp++] = (caddr_t)rdr0();
2460 addr[nbp++] = (caddr_t)rdr1();
2463 addr[nbp++] = (caddr_t)rdr2();
2466 addr[nbp++] = (caddr_t)rdr3();
2469 for (i=0; i<nbp; i++) {
2471 (caddr_t)VM_MAX_USER_ADDRESS) {
2473 * addr[i] is in user space
2480 * None of the breakpoints are in user space.
2488 Debugger(const char *msg)
2490 kprintf("Debugger(\"%s\") called.\n", msg);
2494 #include <sys/disklabel.h>
2497 * Determine the size of the transfer, and make sure it is
2498 * within the boundaries of the partition. Adjust transfer
2499 * if needed, and signal errors or early completion.
2501 * On success a new bio layer is pushed with the translated
2502 * block number, and returned.
2505 bounds_check_with_label(cdev_t dev, struct bio *bio,
2506 struct disklabel *lp, int wlabel)
2509 struct buf *bp = bio->bio_buf;
2510 struct partition *p = lp->d_partitions + dkpart(dev);
2511 int labelsect = lp->d_partitions[0].p_offset;
2512 int maxsz = p->p_size,
2513 sz = (bp->b_bcount + DEV_BSIZE - 1) >> DEV_BSHIFT;
2514 daddr_t blkno = (daddr_t)(bio->bio_offset >> DEV_BSHIFT);
2516 /* overwriting disk label ? */
2517 /* XXX should also protect bootstrap in first 8K */
2518 if (blkno + p->p_offset <= LABELSECTOR + labelsect &&
2519 #if LABELSECTOR != 0
2520 blkno + p->p_offset + sz > LABELSECTOR + labelsect &&
2522 bp->b_cmd != BUF_CMD_READ && wlabel == 0) {
2523 bp->b_error = EROFS;
2527 #if defined(DOSBBSECTOR) && defined(notyet)
2528 /* overwriting master boot record? */
2529 if (blkno + p->p_offset <= DOSBBSECTOR &&
2530 bp->b_cmd != BUF_CMD_READ && wlabel == 0) {
2531 bp->b_error = EROFS;
2537 * Check for out of bounds, EOF, and EOF clipping.
2539 if (bio->bio_offset < 0)
2541 if (blkno + sz > maxsz) {
2543 * Past EOF or B_BNOCLIP flag was set, the request is bad.
2545 if (blkno > maxsz || (bp->b_flags & B_BNOCLIP))
2549 * If exactly on EOF just complete the I/O with no bytes
2550 * transfered. B_INVAL must be set to throw away the
2551 * contents of the buffer. Otherwise clip b_bcount.
2553 if (blkno == maxsz) {
2554 bp->b_resid = bp->b_bcount;
2555 bp->b_flags |= B_INVAL;
2558 bp->b_bcount = (maxsz - blkno) << DEV_BSHIFT;
2560 nbio = push_bio(bio);
2561 nbio->bio_offset = bio->bio_offset + ((off_t)p->p_offset << DEV_BSHIFT);
2565 * The caller is responsible for calling biodone() on the passed bio
2566 * when we return NULL.
2569 bp->b_error = EINVAL;
2571 bp->b_resid = bp->b_bcount;
2572 bp->b_flags |= B_ERROR | B_INVAL;
2580 * Provide inb() and outb() as functions. They are normally only
2581 * available as macros calling inlined functions, thus cannot be
2582 * called inside DDB.
2584 * The actual code is stolen from <machine/cpufunc.h>, and de-inlined.
2590 /* silence compiler warnings */
2592 void outb(u_int, u_char);
2599 * We use %%dx and not %1 here because i/o is done at %dx and not at
2600 * %edx, while gcc generates inferior code (movw instead of movl)
2601 * if we tell it to load (u_short) port.
2603 __asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port));
2608 outb(u_int port, u_char data)
2612 * Use an unnecessary assignment to help gcc's register allocator.
2613 * This make a large difference for gcc-1.40 and a tiny difference
2614 * for gcc-2.6.0. For gcc-1.40, al had to be ``asm("ax")'' for
2615 * best results. gcc-2.6.0 can't handle this.
2618 __asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port));
2625 #include "opt_cpu.h"
2629 * initialize all the SMP locks
2632 /* critical region when masking or unmasking interupts */
2633 struct spinlock_deprecated imen_spinlock;
2635 /* Make FAST_INTR() routines sequential */
2636 struct spinlock_deprecated fast_intr_spinlock;
2638 /* critical region for old style disable_intr/enable_intr */
2639 struct spinlock_deprecated mpintr_spinlock;
2641 /* critical region around INTR() routines */
2642 struct spinlock_deprecated intr_spinlock;
2644 /* lock region used by kernel profiling */
2645 struct spinlock_deprecated mcount_spinlock;
2647 /* locks com (tty) data/hardware accesses: a FASTINTR() */
2648 struct spinlock_deprecated com_spinlock;
2650 /* locks kernel kprintfs */
2651 struct spinlock_deprecated cons_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;
2663 * mp_lock = 0; BSP already owns the MP lock
2666 * Get the initial mp_lock with a count of 1 for the BSP.
2667 * This uses a LOGICAL cpu ID, ie BSP == 0.
2670 cpu_get_initial_mplock();
2673 spin_lock_init(&mcount_spinlock);
2674 spin_lock_init(&fast_intr_spinlock);
2675 spin_lock_init(&intr_spinlock);
2676 spin_lock_init(&mpintr_spinlock);
2677 spin_lock_init(&imen_spinlock);
2678 spin_lock_init(&smp_rv_spinlock);
2679 spin_lock_init(&com_spinlock);
2680 spin_lock_init(&clock_spinlock);
2681 spin_lock_init(&cons_spinlock);
2683 /* our token pool needs to work early */
2684 lwkt_token_pool_init();