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 1.87 2006/03/05 18:38:32 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>
79 #include <vm/vm_param.h>
81 #include <vm/vm_kern.h>
82 #include <vm/vm_object.h>
83 #include <vm/vm_page.h>
84 #include <vm/vm_map.h>
85 #include <vm/vm_pager.h>
86 #include <vm/vm_extern.h>
88 #include <sys/thread2.h>
96 #include <machine/cpu.h>
97 #include <machine/reg.h>
98 #include <machine/clock.h>
99 #include <machine/specialreg.h>
100 #include <machine/bootinfo.h>
101 #include <machine/ipl.h>
102 #include <machine/md_var.h>
103 #include <machine/pcb_ext.h> /* pcb.h included via sys/user.h */
104 #include <machine/globaldata.h> /* CPU_prvspace */
105 #include <machine/smp.h>
107 #include <machine/perfmon.h>
109 #include <machine/cputypes.h>
112 #include <bus/isa/i386/isa_device.h>
114 #include <i386/isa/intr_machdep.h>
115 #include <bus/isa/rtc.h>
116 #include <machine/vm86.h>
117 #include <sys/random.h>
118 #include <sys/ptrace.h>
119 #include <machine/sigframe.h>
121 #define PHYSMAP_ENTRIES 10
123 extern void init386 (int first);
124 extern void dblfault_handler (void);
126 extern void printcpuinfo(void); /* XXX header file */
127 extern void finishidentcpu(void);
128 extern void panicifcpuunsupported(void);
129 extern void initializecpu(void);
131 static void cpu_startup (void *);
132 #ifndef CPU_DISABLE_SSE
133 static void set_fpregs_xmm (struct save87 *, struct savexmm *);
134 static void fill_fpregs_xmm (struct savexmm *, struct save87 *);
135 #endif /* CPU_DISABLE_SSE */
137 extern void ffs_rawread_setup(void);
138 #endif /* DIRECTIO */
139 static void init_locks(void);
141 SYSINIT(cpu, SI_SUB_CPU, SI_ORDER_FIRST, cpu_startup, NULL)
143 int _udatasel, _ucodesel;
146 int64_t tsc_offsets[MAXCPU];
148 int64_t tsc_offsets[1];
151 #if defined(SWTCH_OPTIM_STATS)
152 extern int swtch_optim_stats;
153 SYSCTL_INT(_debug, OID_AUTO, swtch_optim_stats,
154 CTLFLAG_RD, &swtch_optim_stats, 0, "");
155 SYSCTL_INT(_debug, OID_AUTO, tlb_flush_count,
156 CTLFLAG_RD, &tlb_flush_count, 0, "");
163 sysctl_hw_physmem(SYSCTL_HANDLER_ARGS)
165 int error = sysctl_handle_int(oidp, 0, ctob(physmem), req);
169 SYSCTL_PROC(_hw, HW_PHYSMEM, physmem, CTLTYPE_INT|CTLFLAG_RD,
170 0, 0, sysctl_hw_physmem, "IU", "");
173 sysctl_hw_usermem(SYSCTL_HANDLER_ARGS)
175 int error = sysctl_handle_int(oidp, 0,
176 ctob(physmem - vmstats.v_wire_count), req);
180 SYSCTL_PROC(_hw, HW_USERMEM, usermem, CTLTYPE_INT|CTLFLAG_RD,
181 0, 0, sysctl_hw_usermem, "IU", "");
184 sysctl_hw_availpages(SYSCTL_HANDLER_ARGS)
186 int error = sysctl_handle_int(oidp, 0,
187 i386_btop(avail_end - avail_start), req);
191 SYSCTL_PROC(_hw, OID_AUTO, availpages, CTLTYPE_INT|CTLFLAG_RD,
192 0, 0, sysctl_hw_availpages, "I", "");
195 sysctl_machdep_msgbuf(SYSCTL_HANDLER_ARGS)
199 /* Unwind the buffer, so that it's linear (possibly starting with
200 * some initial nulls).
202 error=sysctl_handle_opaque(oidp,msgbufp->msg_ptr+msgbufp->msg_bufr,
203 msgbufp->msg_size-msgbufp->msg_bufr,req);
204 if(error) return(error);
205 if(msgbufp->msg_bufr>0) {
206 error=sysctl_handle_opaque(oidp,msgbufp->msg_ptr,
207 msgbufp->msg_bufr,req);
212 SYSCTL_PROC(_machdep, OID_AUTO, msgbuf, CTLTYPE_STRING|CTLFLAG_RD,
213 0, 0, sysctl_machdep_msgbuf, "A","Contents of kernel message buffer");
215 static int msgbuf_clear;
218 sysctl_machdep_msgbuf_clear(SYSCTL_HANDLER_ARGS)
221 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2,
223 if (!error && req->newptr) {
224 /* Clear the buffer and reset write pointer */
225 bzero(msgbufp->msg_ptr,msgbufp->msg_size);
226 msgbufp->msg_bufr=msgbufp->msg_bufx=0;
232 SYSCTL_PROC(_machdep, OID_AUTO, msgbuf_clear, CTLTYPE_INT|CTLFLAG_RW,
233 &msgbuf_clear, 0, sysctl_machdep_msgbuf_clear, "I",
234 "Clear kernel message buffer");
237 vm_paddr_t Maxmem = 0;
240 vm_paddr_t phys_avail[PHYSMAP_ENTRIES*2+2];
242 static vm_offset_t buffer_sva, buffer_eva;
243 vm_offset_t clean_sva, clean_eva;
244 static vm_offset_t pager_sva, pager_eva;
245 static struct trapframe proc0_tf;
257 if (boothowto & RB_VERBOSE)
261 * Good {morning,afternoon,evening,night}.
263 printf("%s", version);
266 panicifcpuunsupported();
270 printf("real memory = %llu (%lluK bytes)\n", ptoa(Maxmem), ptoa(Maxmem) / 1024);
272 * Display any holes after the first chunk of extended memory.
277 printf("Physical memory chunk(s):\n");
278 for (indx = 0; phys_avail[indx + 1] != 0; indx += 2) {
279 vm_paddr_t size1 = phys_avail[indx + 1] - phys_avail[indx];
281 printf("0x%08llx - 0x%08llx, %llu bytes (%llu pages)\n",
282 phys_avail[indx], phys_avail[indx + 1] - 1, size1,
288 * Allocate space for system data structures.
289 * The first available kernel virtual address is in "v".
290 * As pages of kernel virtual memory are allocated, "v" is incremented.
291 * As pages of memory are allocated and cleared,
292 * "firstaddr" is incremented.
293 * An index into the kernel page table corresponding to the
294 * virtual memory address maintained in "v" is kept in "mapaddr".
298 * Make two passes. The first pass calculates how much memory is
299 * needed and allocates it. The second pass assigns virtual
300 * addresses to the various data structures.
304 v = (caddr_t)firstaddr;
306 #define valloc(name, type, num) \
307 (name) = (type *)v; v = (caddr_t)((name)+(num))
308 #define valloclim(name, type, num, lim) \
309 (name) = (type *)v; v = (caddr_t)((lim) = ((name)+(num)))
312 * The nominal buffer size (and minimum KVA allocation) is BKVASIZE.
313 * For the first 64MB of ram nominally allocate sufficient buffers to
314 * cover 1/4 of our ram. Beyond the first 64MB allocate additional
315 * buffers to cover 1/20 of our ram over 64MB. When auto-sizing
316 * the buffer cache we limit the eventual kva reservation to
319 * factor represents the 1/4 x ram conversion.
322 int factor = 4 * BKVASIZE / 1024;
323 int kbytes = physmem * (PAGE_SIZE / 1024);
327 nbuf += min((kbytes - 4096) / factor, 65536 / factor);
329 nbuf += (kbytes - 65536) * 2 / (factor * 5);
330 if (maxbcache && nbuf > maxbcache / BKVASIZE)
331 nbuf = maxbcache / BKVASIZE;
335 * Do not allow the buffer_map to be more then 1/2 the size of the
338 if (nbuf > (kernel_map->max_offset - kernel_map->min_offset) /
340 nbuf = (kernel_map->max_offset - kernel_map->min_offset) /
342 printf("Warning: nbufs capped at %d\n", nbuf);
345 nswbuf = max(min(nbuf/4, 256), 16);
347 if (nswbuf < NSWBUF_MIN)
354 valloc(swbuf, struct buf, nswbuf);
355 valloc(buf, struct buf, nbuf);
358 * End of first pass, size has been calculated so allocate memory
360 if (firstaddr == 0) {
361 size = (vm_size_t)(v - firstaddr);
362 firstaddr = (int)kmem_alloc(kernel_map, round_page(size));
364 panic("startup: no room for tables");
369 * End of second pass, addresses have been assigned
371 if ((vm_size_t)(v - firstaddr) != size)
372 panic("startup: table size inconsistency");
374 clean_map = kmem_suballoc(kernel_map, &clean_sva, &clean_eva,
375 (nbuf*BKVASIZE) + (nswbuf*MAXPHYS) + pager_map_size);
376 buffer_map = kmem_suballoc(clean_map, &buffer_sva, &buffer_eva,
378 buffer_map->system_map = 1;
379 pager_map = kmem_suballoc(clean_map, &pager_sva, &pager_eva,
380 (nswbuf*MAXPHYS) + pager_map_size);
381 pager_map->system_map = 1;
382 exec_map = kmem_suballoc(kernel_map, &minaddr, &maxaddr,
383 (16*(ARG_MAX+(PAGE_SIZE*3))));
385 #if defined(USERCONFIG)
387 cninit(); /* the preferred console may have changed */
390 printf("avail memory = %u (%uK bytes)\n", ptoa(vmstats.v_free_count),
391 ptoa(vmstats.v_free_count) / 1024);
394 * Set up buffers, so they can be used to read disk labels.
397 vm_pager_bufferinit();
401 * OK, enough kmem_alloc/malloc state should be up, lets get on with it!
403 mp_start(); /* fire up the APs and APICs */
410 * Send an interrupt to process.
412 * Stack is set up to allow sigcode stored
413 * at top to call routine, followed by kcall
414 * to sigreturn routine below. After sigreturn
415 * resets the signal mask, the stack, and the
416 * frame pointer, it returns to the user
420 sendsig(catcher, sig, mask, code)
426 struct lwp *lp = curthread->td_lwp;
427 struct proc *p = lp->lwp_proc;
428 struct trapframe *regs;
429 struct sigacts *psp = p->p_sigacts;
430 struct sigframe sf, *sfp;
433 regs = lp->lwp_md.md_regs;
434 oonstack = (lp->lwp_sigstk.ss_flags & SS_ONSTACK) ? 1 : 0;
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 sf.sf_uc.uc_mcontext.mc_gs = rgs();
442 bcopy(regs, &sf.sf_uc.uc_mcontext.mc_fs, sizeof(struct trapframe));
444 /* Allocate and validate space for the signal handler context. */
446 if ((p->p_flag & P_ALTSTACK) != 0 && !oonstack &&
447 SIGISMEMBER(psp->ps_sigonstack, sig)) {
448 sfp = (struct sigframe *)(lp->lwp_sigstk.ss_sp +
449 lp->lwp_sigstk.ss_size - sizeof(struct sigframe));
450 lp->lwp_sigstk.ss_flags |= SS_ONSTACK;
453 sfp = (struct sigframe *)regs->tf_esp - 1;
455 /* Translate the signal is appropriate */
456 if (p->p_sysent->sv_sigtbl) {
457 if (sig <= p->p_sysent->sv_sigsize)
458 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)];
461 /* Build the argument list for the signal handler. */
463 sf.sf_ucontext = (register_t)&sfp->sf_uc;
464 if (SIGISMEMBER(psp->ps_siginfo, sig)) {
465 /* Signal handler installed with SA_SIGINFO. */
466 sf.sf_siginfo = (register_t)&sfp->sf_si;
467 sf.sf_ahu.sf_action = (__siginfohandler_t *)catcher;
469 /* fill siginfo structure */
470 sf.sf_si.si_signo = sig;
471 sf.sf_si.si_code = code;
472 sf.sf_si.si_addr = (void*)regs->tf_err;
475 /* Old FreeBSD-style arguments. */
476 sf.sf_siginfo = code;
477 sf.sf_addr = regs->tf_err;
478 sf.sf_ahu.sf_handler = catcher;
482 * If we're a vm86 process, we want to save the segment registers.
483 * We also change eflags to be our emulated eflags, not the actual
486 if (regs->tf_eflags & PSL_VM) {
487 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs;
488 struct vm86_kernel *vm86 = &lp->lwp_thread->td_pcb->pcb_ext->ext_vm86;
490 sf.sf_uc.uc_mcontext.mc_gs = tf->tf_vm86_gs;
491 sf.sf_uc.uc_mcontext.mc_fs = tf->tf_vm86_fs;
492 sf.sf_uc.uc_mcontext.mc_es = tf->tf_vm86_es;
493 sf.sf_uc.uc_mcontext.mc_ds = tf->tf_vm86_ds;
495 if (vm86->vm86_has_vme == 0)
496 sf.sf_uc.uc_mcontext.mc_eflags =
497 (tf->tf_eflags & ~(PSL_VIF | PSL_VIP)) |
498 (vm86->vm86_eflags & (PSL_VIF | PSL_VIP));
501 * Clear PSL_NT to inhibit T_TSSFLT faults on return from
502 * syscalls made by the signal handler. This just avoids
503 * wasting time for our lazy fixup of such faults. PSL_NT
504 * does nothing in vm86 mode, but vm86 programs can set it
505 * almost legitimately in probes for old cpu types.
507 tf->tf_eflags &= ~(PSL_VM | PSL_NT | PSL_VIF | PSL_VIP);
511 * Copy the sigframe out to the user's stack.
513 if (copyout(&sf, sfp, sizeof(struct sigframe)) != 0) {
515 * Something is wrong with the stack pointer.
516 * ...Kill the process.
521 regs->tf_esp = (int)sfp;
522 regs->tf_eip = PS_STRINGS - *(p->p_sysent->sv_szsigcode);
523 regs->tf_eflags &= ~PSL_T;
524 regs->tf_cs = _ucodesel;
525 regs->tf_ds = _udatasel;
526 regs->tf_es = _udatasel;
527 regs->tf_fs = _udatasel;
528 regs->tf_ss = _udatasel;
532 * sigreturn(ucontext_t *sigcntxp)
534 * System call to cleanup state after a signal
535 * has been taken. Reset signal mask and
536 * stack state from context left by sendsig (above).
537 * Return to previous pc and psl as specified by
538 * context left by sendsig. Check carefully to
539 * make sure that the user has not modified the
540 * state to gain improper privileges.
542 #define EFL_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0)
543 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL)
546 sigreturn(struct sigreturn_args *uap)
548 struct lwp *lp = curthread->td_lwp;
549 struct trapframe *regs;
555 if (!useracc((caddr_t)ucp, sizeof(ucontext_t), VM_PROT_READ))
558 regs = lp->lwp_md.md_regs;
559 eflags = ucp->uc_mcontext.mc_eflags;
561 if (eflags & PSL_VM) {
562 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs;
563 struct vm86_kernel *vm86;
566 * if pcb_ext == 0 or vm86_inited == 0, the user hasn't
567 * set up the vm86 area, and we can't enter vm86 mode.
569 if (lp->lwp_thread->td_pcb->pcb_ext == 0)
571 vm86 = &lp->lwp_thread->td_pcb->pcb_ext->ext_vm86;
572 if (vm86->vm86_inited == 0)
575 /* go back to user mode if both flags are set */
576 if ((eflags & PSL_VIP) && (eflags & PSL_VIF))
577 trapsignal(lp->lwp_proc, SIGBUS, 0);
579 if (vm86->vm86_has_vme) {
580 eflags = (tf->tf_eflags & ~VME_USERCHANGE) |
581 (eflags & VME_USERCHANGE) | PSL_VM;
583 vm86->vm86_eflags = eflags; /* save VIF, VIP */
584 eflags = (tf->tf_eflags & ~VM_USERCHANGE) | (eflags & VM_USERCHANGE) | PSL_VM;
586 bcopy(&ucp->uc_mcontext.mc_fs, tf, sizeof(struct trapframe));
587 tf->tf_eflags = eflags;
588 tf->tf_vm86_ds = tf->tf_ds;
589 tf->tf_vm86_es = tf->tf_es;
590 tf->tf_vm86_fs = tf->tf_fs;
591 tf->tf_vm86_gs = ucp->uc_mcontext.mc_gs;
592 tf->tf_ds = _udatasel;
593 tf->tf_es = _udatasel;
594 tf->tf_fs = _udatasel;
597 * Don't allow users to change privileged or reserved flags.
600 * XXX do allow users to change the privileged flag PSL_RF.
601 * The cpu sets PSL_RF in tf_eflags for faults. Debuggers
602 * should sometimes set it there too. tf_eflags is kept in
603 * the signal context during signal handling and there is no
604 * other place to remember it, so the PSL_RF bit may be
605 * corrupted by the signal handler without us knowing.
606 * Corruption of the PSL_RF bit at worst causes one more or
607 * one less debugger trap, so allowing it is fairly harmless.
609 if (!EFL_SECURE(eflags & ~PSL_RF, regs->tf_eflags & ~PSL_RF)) {
610 printf("sigreturn: eflags = 0x%x\n", eflags);
615 * Don't allow users to load a valid privileged %cs. Let the
616 * hardware check for invalid selectors, excess privilege in
617 * other selectors, invalid %eip's and invalid %esp's.
619 cs = ucp->uc_mcontext.mc_cs;
620 if (!CS_SECURE(cs)) {
621 printf("sigreturn: cs = 0x%x\n", cs);
622 trapsignal(lp->lwp_proc, SIGBUS, T_PROTFLT);
625 bcopy(&ucp->uc_mcontext.mc_fs, regs, sizeof(struct trapframe));
628 if (ucp->uc_mcontext.mc_onstack & 1)
629 lp->lwp_sigstk.ss_flags |= SS_ONSTACK;
631 lp->lwp_sigstk.ss_flags &= ~SS_ONSTACK;
633 lp->lwp_sigmask = ucp->uc_sigmask;
634 SIG_CANTMASK(lp->lwp_sigmask);
639 * Stack frame on entry to function. %eax will contain the function vector,
640 * %ecx will contain the function data. flags, ecx, and eax will have
641 * already been pushed on the stack.
652 sendupcall(struct vmupcall *vu, int morepending)
654 struct lwp *lp = curthread->td_lwp;
655 struct trapframe *regs;
656 struct upcall upcall;
657 struct upc_frame upc_frame;
661 * Get the upcall data structure
663 if (copyin(lp->lwp_upcall, &upcall, sizeof(upcall)) ||
664 copyin((char *)upcall.upc_uthread + upcall.upc_critoff, &crit_count, sizeof(int))
667 printf("bad upcall address\n");
672 * If the data structure is already marked pending or has a critical
673 * section count, mark the data structure as pending and return
674 * without doing an upcall. vu_pending is left set.
676 if (upcall.upc_pending || crit_count >= vu->vu_pending) {
677 if (upcall.upc_pending < vu->vu_pending) {
678 upcall.upc_pending = vu->vu_pending;
679 copyout(&upcall.upc_pending, &lp->lwp_upcall->upc_pending,
680 sizeof(upcall.upc_pending));
686 * We can run this upcall now, clear vu_pending.
688 * Bump our critical section count and set or clear the
689 * user pending flag depending on whether more upcalls are
690 * pending. The user will be responsible for calling
691 * upc_dispatch(-1) to process remaining upcalls.
694 upcall.upc_pending = morepending;
695 crit_count += TDPRI_CRIT;
696 copyout(&upcall.upc_pending, &lp->lwp_upcall->upc_pending,
697 sizeof(upcall.upc_pending));
698 copyout(&crit_count, (char *)upcall.upc_uthread + upcall.upc_critoff,
702 * Construct a stack frame and issue the upcall
704 regs = lp->lwp_md.md_regs;
705 upc_frame.eax = regs->tf_eax;
706 upc_frame.ecx = regs->tf_ecx;
707 upc_frame.edx = regs->tf_edx;
708 upc_frame.flags = regs->tf_eflags;
709 upc_frame.oldip = regs->tf_eip;
710 if (copyout(&upc_frame, (void *)(regs->tf_esp - sizeof(upc_frame)),
711 sizeof(upc_frame)) != 0) {
712 printf("bad stack on upcall\n");
714 regs->tf_eax = (register_t)vu->vu_func;
715 regs->tf_ecx = (register_t)vu->vu_data;
716 regs->tf_edx = (register_t)lp->lwp_upcall;
717 regs->tf_eip = (register_t)vu->vu_ctx;
718 regs->tf_esp -= sizeof(upc_frame);
723 * fetchupcall occurs in the context of a system call, which means that
724 * we have to return EJUSTRETURN in order to prevent eax and edx from
725 * being overwritten by the syscall return value.
727 * if vu is not NULL we return the new context in %edx, the new data in %ecx,
728 * and the function pointer in %eax.
731 fetchupcall (struct vmupcall *vu, int morepending, void *rsp)
733 struct upc_frame upc_frame;
734 struct lwp *lp = curthread->td_lwp;
735 struct trapframe *regs;
737 struct upcall upcall;
740 regs = lp->lwp_md.md_regs;
742 error = copyout(&morepending, &lp->lwp_upcall->upc_pending, sizeof(int));
746 * This jumps us to the next ready context.
749 error = copyin(lp->lwp_upcall, &upcall, sizeof(upcall));
752 error = copyin((char *)upcall.upc_uthread + upcall.upc_critoff, &crit_count, sizeof(int));
753 crit_count += TDPRI_CRIT;
755 error = copyout(&crit_count, (char *)upcall.upc_uthread + upcall.upc_critoff, sizeof(int));
756 regs->tf_eax = (register_t)vu->vu_func;
757 regs->tf_ecx = (register_t)vu->vu_data;
758 regs->tf_edx = (register_t)lp->lwp_upcall;
759 regs->tf_eip = (register_t)vu->vu_ctx;
760 regs->tf_esp = (register_t)rsp;
763 * This returns us to the originally interrupted code.
765 error = copyin(rsp, &upc_frame, sizeof(upc_frame));
766 regs->tf_eax = upc_frame.eax;
767 regs->tf_ecx = upc_frame.ecx;
768 regs->tf_edx = upc_frame.edx;
769 regs->tf_eflags = (regs->tf_eflags & ~PSL_USERCHANGE) |
770 (upc_frame.flags & PSL_USERCHANGE);
771 regs->tf_eip = upc_frame.oldip;
772 regs->tf_esp = (register_t)((char *)rsp + sizeof(upc_frame));
781 * Machine dependent boot() routine
783 * I haven't seen anything to put here yet
784 * Possibly some stuff might be grafted back here from boot()
792 * Shutdown the CPU as much as possible
802 * cpu_idle() represents the idle LWKT. You cannot return from this function
803 * (unless you want to blow things up!). Instead we look for runnable threads
804 * and loop or halt as appropriate. Giant is not held on entry to the thread.
806 * The main loop is entered with a critical section held, we must release
807 * the critical section before doing anything else. lwkt_switch() will
808 * check for pending interrupts due to entering and exiting its own
811 * Note on cpu_idle_hlt: On an SMP system we rely on a scheduler IPI
812 * to wake a HLTed cpu up. However, there are cases where the idlethread
813 * will be entered with the possibility that no IPI will occur and in such
814 * cases lwkt_switch() sets TDF_IDLE_NOHLT.
816 static int cpu_idle_hlt = 1;
817 static int cpu_idle_hltcnt;
818 static int cpu_idle_spincnt;
819 SYSCTL_INT(_machdep, OID_AUTO, cpu_idle_hlt, CTLFLAG_RW,
820 &cpu_idle_hlt, 0, "Idle loop HLT enable");
821 SYSCTL_INT(_machdep, OID_AUTO, cpu_idle_hltcnt, CTLFLAG_RW,
822 &cpu_idle_hltcnt, 0, "Idle loop entry halts");
823 SYSCTL_INT(_machdep, OID_AUTO, cpu_idle_spincnt, CTLFLAG_RW,
824 &cpu_idle_spincnt, 0, "Idle loop entry spins");
827 cpu_idle_default_hook(void)
830 * We must guarentee that hlt is exactly the instruction
833 __asm __volatile("sti; hlt");
836 /* Other subsystems (e.g., ACPI) can hook this later. */
837 void (*cpu_idle_hook)(void) = cpu_idle_default_hook;
842 struct thread *td = curthread;
845 KKASSERT(td->td_pri < TDPRI_CRIT);
848 * See if there are any LWKTs ready to go.
853 * If we are going to halt call splz unconditionally after
854 * CLIing to catch any interrupt races. Note that we are
855 * at SPL0 and interrupts are enabled.
857 if (cpu_idle_hlt && !lwkt_runnable() &&
858 (td->td_flags & TDF_IDLE_NOHLT) == 0) {
859 __asm __volatile("cli");
861 if (!lwkt_runnable())
865 __asm __volatile("pause");
869 td->td_flags &= ~TDF_IDLE_NOHLT;
872 __asm __volatile("sti; pause");
874 __asm __volatile("sti");
882 * Clear registers on exec
885 setregs(p, entry, stack, ps_strings)
891 struct trapframe *regs = p->p_md.md_regs;
892 struct pcb *pcb = p->p_thread->td_pcb;
894 /* Reset pc->pcb_gs and %gs before possibly invalidating it. */
895 pcb->pcb_gs = _udatasel;
898 /* was i386_user_cleanup() in NetBSD */
901 bzero((char *)regs, sizeof(struct trapframe));
902 regs->tf_eip = entry;
903 regs->tf_esp = stack;
904 regs->tf_eflags = PSL_USER | (regs->tf_eflags & PSL_T);
905 regs->tf_ss = _udatasel;
906 regs->tf_ds = _udatasel;
907 regs->tf_es = _udatasel;
908 regs->tf_fs = _udatasel;
909 regs->tf_cs = _ucodesel;
911 /* PS_STRINGS value for BSD/OS binaries. It is 0 for non-BSD/OS. */
912 regs->tf_ebx = ps_strings;
915 * Reset the hardware debug registers if they were in use.
916 * They won't have any meaning for the newly exec'd process.
918 if (pcb->pcb_flags & PCB_DBREGS) {
925 if (pcb == curthread->td_pcb) {
927 * Clear the debug registers on the running
928 * CPU, otherwise they will end up affecting
929 * the next process we switch to.
933 pcb->pcb_flags &= ~PCB_DBREGS;
937 * Initialize the math emulator (if any) for the current process.
938 * Actually, just clear the bit that says that the emulator has
939 * been initialized. Initialization is delayed until the process
940 * traps to the emulator (if it is done at all) mainly because
941 * emulators don't provide an entry point for initialization.
943 p->p_thread->td_pcb->pcb_flags &= ~FP_SOFTFP;
946 * note: do not set CR0_TS here. npxinit() must do it after clearing
947 * gd_npxthread. Otherwise a preemptive interrupt thread may panic
951 load_cr0(rcr0() | CR0_MP);
954 /* Initialize the npx (if any) for the current process. */
955 npxinit(__INITIAL_NPXCW__);
960 * note: linux emulator needs edx to be 0x0 on entry, which is
961 * handled in execve simply by setting the 64 bit syscall
972 cr0 |= CR0_NE; /* Done by npxinit() */
973 cr0 |= CR0_MP | CR0_TS; /* Done at every execve() too. */
975 if (cpu_class != CPUCLASS_386)
977 cr0 |= CR0_WP | CR0_AM;
983 sysctl_machdep_adjkerntz(SYSCTL_HANDLER_ARGS)
986 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2,
988 if (!error && req->newptr)
993 SYSCTL_PROC(_machdep, CPU_ADJKERNTZ, adjkerntz, CTLTYPE_INT|CTLFLAG_RW,
994 &adjkerntz, 0, sysctl_machdep_adjkerntz, "I", "");
996 SYSCTL_INT(_machdep, CPU_DISRTCSET, disable_rtc_set,
997 CTLFLAG_RW, &disable_rtc_set, 0, "");
999 SYSCTL_STRUCT(_machdep, CPU_BOOTINFO, bootinfo,
1000 CTLFLAG_RD, &bootinfo, bootinfo, "");
1002 SYSCTL_INT(_machdep, CPU_WALLCLOCK, wall_cmos_clock,
1003 CTLFLAG_RW, &wall_cmos_clock, 0, "");
1005 extern u_long bootdev; /* not a dev_t - encoding is different */
1006 SYSCTL_ULONG(_machdep, OID_AUTO, guessed_bootdev,
1007 CTLFLAG_RD, &bootdev, 0, "Boot device (not in dev_t format)");
1010 * Initialize 386 and configure to run kernel
1014 * Initialize segments & interrupt table
1018 union descriptor gdt[NGDT * MAXCPU]; /* global descriptor table */
1019 static struct gate_descriptor idt0[NIDT];
1020 struct gate_descriptor *idt = &idt0[0]; /* interrupt descriptor table */
1021 union descriptor ldt[NLDT]; /* local descriptor table */
1023 /* table descriptors - used to load tables by cpu */
1024 struct region_descriptor r_gdt, r_idt;
1026 #if defined(I586_CPU) && !defined(NO_F00F_HACK)
1027 extern int has_f00f_bug;
1030 static struct i386tss dblfault_tss;
1031 static char dblfault_stack[PAGE_SIZE];
1033 extern struct user *proc0paddr;
1036 /* software prototypes -- in more palatable form */
1037 struct soft_segment_descriptor gdt_segs[] = {
1038 /* GNULL_SEL 0 Null Descriptor */
1039 { 0x0, /* segment base address */
1041 0, /* segment type */
1042 0, /* segment descriptor priority level */
1043 0, /* segment descriptor present */
1045 0, /* default 32 vs 16 bit size */
1046 0 /* limit granularity (byte/page units)*/ },
1047 /* GCODE_SEL 1 Code Descriptor for kernel */
1048 { 0x0, /* segment base address */
1049 0xfffff, /* length - all address space */
1050 SDT_MEMERA, /* segment type */
1051 0, /* segment descriptor priority level */
1052 1, /* segment descriptor present */
1054 1, /* default 32 vs 16 bit size */
1055 1 /* limit granularity (byte/page units)*/ },
1056 /* GDATA_SEL 2 Data Descriptor for kernel */
1057 { 0x0, /* segment base address */
1058 0xfffff, /* length - all address space */
1059 SDT_MEMRWA, /* segment type */
1060 0, /* segment descriptor priority level */
1061 1, /* segment descriptor present */
1063 1, /* default 32 vs 16 bit size */
1064 1 /* limit granularity (byte/page units)*/ },
1065 /* GPRIV_SEL 3 SMP Per-Processor Private Data Descriptor */
1066 { 0x0, /* segment base address */
1067 0xfffff, /* length - all address space */
1068 SDT_MEMRWA, /* segment type */
1069 0, /* segment descriptor priority level */
1070 1, /* segment descriptor present */
1072 1, /* default 32 vs 16 bit size */
1073 1 /* limit granularity (byte/page units)*/ },
1074 /* GPROC0_SEL 4 Proc 0 Tss Descriptor */
1076 0x0, /* segment base address */
1077 sizeof(struct i386tss)-1,/* length - all address space */
1078 SDT_SYS386TSS, /* segment type */
1079 0, /* segment descriptor priority level */
1080 1, /* segment descriptor present */
1082 0, /* unused - default 32 vs 16 bit size */
1083 0 /* limit granularity (byte/page units)*/ },
1084 /* GLDT_SEL 5 LDT Descriptor */
1085 { (int) ldt, /* segment base address */
1086 sizeof(ldt)-1, /* length - all address space */
1087 SDT_SYSLDT, /* segment type */
1088 SEL_UPL, /* segment descriptor priority level */
1089 1, /* segment descriptor present */
1091 0, /* unused - default 32 vs 16 bit size */
1092 0 /* limit granularity (byte/page units)*/ },
1093 /* GUSERLDT_SEL 6 User LDT Descriptor per process */
1094 { (int) ldt, /* segment base address */
1095 (512 * sizeof(union descriptor)-1), /* length */
1096 SDT_SYSLDT, /* segment type */
1097 0, /* segment descriptor priority level */
1098 1, /* segment descriptor present */
1100 0, /* unused - default 32 vs 16 bit size */
1101 0 /* limit granularity (byte/page units)*/ },
1102 /* GTGATE_SEL 7 Null Descriptor - Placeholder */
1103 { 0x0, /* segment base address */
1104 0x0, /* length - all address space */
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 /* GBIOSLOWMEM_SEL 8 BIOS access to realmode segment 0x40, must be #8 in GDT */
1112 { 0x400, /* segment base address */
1113 0xfffff, /* length */
1114 SDT_MEMRWA, /* 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 /* GPANIC_SEL 9 Panic Tss Descriptor */
1121 { (int) &dblfault_tss, /* segment base address */
1122 sizeof(struct i386tss)-1,/* length - all address space */
1123 SDT_SYS386TSS, /* segment type */
1124 0, /* segment descriptor priority level */
1125 1, /* segment descriptor present */
1127 0, /* unused - default 32 vs 16 bit size */
1128 0 /* limit granularity (byte/page units)*/ },
1129 /* GBIOSCODE32_SEL 10 BIOS 32-bit interface (32bit Code) */
1130 { 0, /* segment base address (overwritten) */
1131 0xfffff, /* length */
1132 SDT_MEMERA, /* segment type */
1133 0, /* segment descriptor priority level */
1134 1, /* segment descriptor present */
1136 0, /* default 32 vs 16 bit size */
1137 1 /* limit granularity (byte/page units)*/ },
1138 /* GBIOSCODE16_SEL 11 BIOS 32-bit interface (16bit Code) */
1139 { 0, /* segment base address (overwritten) */
1140 0xfffff, /* length */
1141 SDT_MEMERA, /* segment type */
1142 0, /* segment descriptor priority level */
1143 1, /* segment descriptor present */
1145 0, /* default 32 vs 16 bit size */
1146 1 /* limit granularity (byte/page units)*/ },
1147 /* GBIOSDATA_SEL 12 BIOS 32-bit interface (Data) */
1148 { 0, /* segment base address (overwritten) */
1149 0xfffff, /* length */
1150 SDT_MEMRWA, /* segment type */
1151 0, /* segment descriptor priority level */
1152 1, /* segment descriptor present */
1154 1, /* default 32 vs 16 bit size */
1155 1 /* limit granularity (byte/page units)*/ },
1156 /* GBIOSUTIL_SEL 13 BIOS 16-bit interface (Utility) */
1157 { 0, /* segment base address (overwritten) */
1158 0xfffff, /* length */
1159 SDT_MEMRWA, /* segment type */
1160 0, /* segment descriptor priority level */
1161 1, /* segment descriptor present */
1163 0, /* default 32 vs 16 bit size */
1164 1 /* limit granularity (byte/page units)*/ },
1165 /* GBIOSARGS_SEL 14 BIOS 16-bit interface (Arguments) */
1166 { 0, /* segment base address (overwritten) */
1167 0xfffff, /* length */
1168 SDT_MEMRWA, /* segment type */
1169 0, /* segment descriptor priority level */
1170 1, /* segment descriptor present */
1172 0, /* default 32 vs 16 bit size */
1173 1 /* limit granularity (byte/page units)*/ },
1174 /* GTLS_START 15 TLS */
1175 { 0x0, /* segment base address */
1177 0, /* segment type */
1178 0, /* segment descriptor priority level */
1179 0, /* segment descriptor present */
1181 0, /* default 32 vs 16 bit size */
1182 0 /* limit granularity (byte/page units)*/ },
1183 /* GTLS_START+1 16 TLS */
1184 { 0x0, /* segment base address */
1186 0, /* segment type */
1187 0, /* segment descriptor priority level */
1188 0, /* segment descriptor present */
1190 0, /* default 32 vs 16 bit size */
1191 0 /* limit granularity (byte/page units)*/ },
1192 /* GTLS_END 17 TLS */
1193 { 0x0, /* segment base address */
1195 0, /* segment type */
1196 0, /* segment descriptor priority level */
1197 0, /* segment descriptor present */
1199 0, /* default 32 vs 16 bit size */
1200 0 /* limit granularity (byte/page units)*/ },
1203 static struct soft_segment_descriptor ldt_segs[] = {
1204 /* Null Descriptor - overwritten by call gate */
1205 { 0x0, /* segment base address */
1206 0x0, /* length - all address space */
1207 0, /* segment type */
1208 0, /* segment descriptor priority level */
1209 0, /* segment descriptor present */
1211 0, /* default 32 vs 16 bit size */
1212 0 /* limit granularity (byte/page units)*/ },
1213 /* Null Descriptor - overwritten by call gate */
1214 { 0x0, /* segment base address */
1215 0x0, /* length - all address space */
1216 0, /* segment type */
1217 0, /* segment descriptor priority level */
1218 0, /* segment descriptor present */
1220 0, /* default 32 vs 16 bit size */
1221 0 /* limit granularity (byte/page units)*/ },
1222 /* Null Descriptor - overwritten by call gate */
1223 { 0x0, /* segment base address */
1224 0x0, /* length - all address space */
1225 0, /* segment type */
1226 0, /* segment descriptor priority level */
1227 0, /* segment descriptor present */
1229 0, /* default 32 vs 16 bit size */
1230 0 /* limit granularity (byte/page units)*/ },
1231 /* Code Descriptor for user */
1232 { 0x0, /* segment base address */
1233 0xfffff, /* length - all address space */
1234 SDT_MEMERA, /* segment type */
1235 SEL_UPL, /* segment descriptor priority level */
1236 1, /* segment descriptor present */
1238 1, /* default 32 vs 16 bit size */
1239 1 /* limit granularity (byte/page units)*/ },
1240 /* Null Descriptor - overwritten by call gate */
1241 { 0x0, /* segment base address */
1242 0x0, /* length - all address space */
1243 0, /* segment type */
1244 0, /* segment descriptor priority level */
1245 0, /* segment descriptor present */
1247 0, /* default 32 vs 16 bit size */
1248 0 /* limit granularity (byte/page units)*/ },
1249 /* Data Descriptor for user */
1250 { 0x0, /* segment base address */
1251 0xfffff, /* length - all address space */
1252 SDT_MEMRWA, /* segment type */
1253 SEL_UPL, /* segment descriptor priority level */
1254 1, /* segment descriptor present */
1256 1, /* default 32 vs 16 bit size */
1257 1 /* limit granularity (byte/page units)*/ },
1261 setidt(idx, func, typ, dpl, selec)
1268 struct gate_descriptor *ip;
1271 ip->gd_looffset = (int)func;
1272 ip->gd_selector = selec;
1278 ip->gd_hioffset = ((int)func)>>16 ;
1281 #define IDTVEC(name) __CONCAT(X,name)
1284 IDTVEC(div), IDTVEC(dbg), IDTVEC(nmi), IDTVEC(bpt), IDTVEC(ofl),
1285 IDTVEC(bnd), IDTVEC(ill), IDTVEC(dna), IDTVEC(fpusegm),
1286 IDTVEC(tss), IDTVEC(missing), IDTVEC(stk), IDTVEC(prot),
1287 IDTVEC(page), IDTVEC(mchk), IDTVEC(fpu), IDTVEC(align),
1288 IDTVEC(xmm), IDTVEC(syscall),
1291 IDTVEC(int0x80_syscall), IDTVEC(int0x81_syscall),
1292 IDTVEC(int0x82_syscall);
1294 #ifdef DEBUG_INTERRUPTS
1295 extern inthand_t *Xrsvdary[256];
1300 struct segment_descriptor *sd;
1301 struct soft_segment_descriptor *ssd;
1303 ssd->ssd_base = (sd->sd_hibase << 24) | sd->sd_lobase;
1304 ssd->ssd_limit = (sd->sd_hilimit << 16) | sd->sd_lolimit;
1305 ssd->ssd_type = sd->sd_type;
1306 ssd->ssd_dpl = sd->sd_dpl;
1307 ssd->ssd_p = sd->sd_p;
1308 ssd->ssd_def32 = sd->sd_def32;
1309 ssd->ssd_gran = sd->sd_gran;
1313 * Populate the (physmap) array with base/bound pairs describing the
1314 * available physical memory in the system, then test this memory and
1315 * build the phys_avail array describing the actually-available memory.
1317 * If we cannot accurately determine the physical memory map, then use
1318 * value from the 0xE801 call, and failing that, the RTC.
1320 * Total memory size may be set by the kernel environment variable
1321 * hw.physmem or the compile-time define MAXMEM.
1324 getmemsize(int first)
1326 int i, physmap_idx, pa_indx;
1328 u_int basemem, extmem;
1329 struct vm86frame vmf;
1330 struct vm86context vmc;
1332 vm_offset_t physmap[PHYSMAP_ENTRIES*2];
1340 quad_t dcons_addr, dcons_size;
1343 TUNABLE_INT_FETCH("hw.hasbrokenint12", &hasbrokenint12);
1344 bzero(&vmf, sizeof(struct vm86frame));
1345 bzero(physmap, sizeof(physmap));
1349 * Some newer BIOSes has broken INT 12H implementation which cause
1350 * kernel panic immediately. In this case, we need to scan SMAP
1351 * with INT 15:E820 first, then determine base memory size.
1353 if (hasbrokenint12) {
1358 * Perform "base memory" related probes & setup. If we get a crazy
1359 * value give the bios some scribble space just in case.
1361 vm86_intcall(0x12, &vmf);
1362 basemem = vmf.vmf_ax;
1363 if (basemem > 640) {
1364 printf("Preposterous BIOS basemem of %uK, "
1365 "truncating to < 640K\n", basemem);
1370 * XXX if biosbasemem is now < 640, there is a `hole'
1371 * between the end of base memory and the start of
1372 * ISA memory. The hole may be empty or it may
1373 * contain BIOS code or data. Map it read/write so
1374 * that the BIOS can write to it. (Memory from 0 to
1375 * the physical end of the kernel is mapped read-only
1376 * to begin with and then parts of it are remapped.
1377 * The parts that aren't remapped form holes that
1378 * remain read-only and are unused by the kernel.
1379 * The base memory area is below the physical end of
1380 * the kernel and right now forms a read-only hole.
1381 * The part of it from PAGE_SIZE to
1382 * (trunc_page(biosbasemem * 1024) - 1) will be
1383 * remapped and used by the kernel later.)
1385 * This code is similar to the code used in
1386 * pmap_mapdev, but since no memory needs to be
1387 * allocated we simply change the mapping.
1389 for (pa = trunc_page(basemem * 1024);
1390 pa < ISA_HOLE_START; pa += PAGE_SIZE) {
1391 pte = vtopte(pa + KERNBASE);
1392 *pte = pa | PG_RW | PG_V;
1396 * if basemem != 640, map pages r/w into vm86 page table so
1397 * that the bios can scribble on it.
1400 for (i = basemem / 4; i < 160; i++)
1401 pte[i] = (i << PAGE_SHIFT) | PG_V | PG_RW | PG_U;
1405 * map page 1 R/W into the kernel page table so we can use it
1406 * as a buffer. The kernel will unmap this page later.
1408 pte = vtopte(KERNBASE + (1 << PAGE_SHIFT));
1409 *pte = (1 << PAGE_SHIFT) | PG_RW | PG_V;
1412 * get memory map with INT 15:E820
1414 #define SMAPSIZ sizeof(*smap)
1415 #define SMAP_SIG 0x534D4150 /* 'SMAP' */
1418 smap = (void *)vm86_addpage(&vmc, 1, KERNBASE + (1 << PAGE_SHIFT));
1419 vm86_getptr(&vmc, (vm_offset_t)smap, &vmf.vmf_es, &vmf.vmf_di);
1424 vmf.vmf_eax = 0xE820;
1425 vmf.vmf_edx = SMAP_SIG;
1426 vmf.vmf_ecx = SMAPSIZ;
1427 i = vm86_datacall(0x15, &vmf, &vmc);
1428 if (i || vmf.vmf_eax != SMAP_SIG)
1430 if (boothowto & RB_VERBOSE)
1431 printf("SMAP type=%02x base=%08x %08x len=%08x %08x\n",
1433 *(u_int32_t *)((char *)&smap->base + 4),
1434 (u_int32_t)smap->base,
1435 *(u_int32_t *)((char *)&smap->length + 4),
1436 (u_int32_t)smap->length);
1438 if (smap->type != 0x01)
1441 if (smap->length == 0)
1444 if (smap->base >= 0xffffffff) {
1445 printf("%uK of memory above 4GB ignored\n",
1446 (u_int)(smap->length / 1024));
1450 for (i = 0; i <= physmap_idx; i += 2) {
1451 if (smap->base < physmap[i + 1]) {
1452 if (boothowto & RB_VERBOSE)
1454 "Overlapping or non-montonic memory region, ignoring second region\n");
1459 if (smap->base == physmap[physmap_idx + 1]) {
1460 physmap[physmap_idx + 1] += smap->length;
1465 if (physmap_idx == PHYSMAP_ENTRIES*2) {
1467 "Too many segments in the physical address map, giving up\n");
1470 physmap[physmap_idx] = smap->base;
1471 physmap[physmap_idx + 1] = smap->base + smap->length;
1473 ; /* fix GCC3.x warning */
1474 } while (vmf.vmf_ebx != 0);
1477 * Perform "base memory" related probes & setup based on SMAP
1480 for (i = 0; i <= physmap_idx; i += 2) {
1481 if (physmap[i] == 0x00000000) {
1482 basemem = physmap[i + 1] / 1024;
1491 if (basemem > 640) {
1492 printf("Preposterous BIOS basemem of %uK, truncating to 640K\n",
1497 for (pa = trunc_page(basemem * 1024);
1498 pa < ISA_HOLE_START; pa += PAGE_SIZE) {
1499 pte = vtopte(pa + KERNBASE);
1500 *pte = pa | PG_RW | PG_V;
1504 for (i = basemem / 4; i < 160; i++)
1505 pte[i] = (i << PAGE_SHIFT) | PG_V | PG_RW | PG_U;
1508 if (physmap[1] != 0)
1512 * If we failed above, try memory map with INT 15:E801
1514 vmf.vmf_ax = 0xE801;
1515 if (vm86_intcall(0x15, &vmf) == 0) {
1516 extmem = vmf.vmf_cx + vmf.vmf_dx * 64;
1520 vm86_intcall(0x15, &vmf);
1521 extmem = vmf.vmf_ax;
1524 * Prefer the RTC value for extended memory.
1526 extmem = rtcin(RTC_EXTLO) + (rtcin(RTC_EXTHI) << 8);
1531 * Special hack for chipsets that still remap the 384k hole when
1532 * there's 16MB of memory - this really confuses people that
1533 * are trying to use bus mastering ISA controllers with the
1534 * "16MB limit"; they only have 16MB, but the remapping puts
1535 * them beyond the limit.
1537 * If extended memory is between 15-16MB (16-17MB phys address range),
1540 if ((extmem > 15 * 1024) && (extmem < 16 * 1024))
1544 physmap[1] = basemem * 1024;
1546 physmap[physmap_idx] = 0x100000;
1547 physmap[physmap_idx + 1] = physmap[physmap_idx] + extmem * 1024;
1551 * Now, physmap contains a map of physical memory.
1555 /* make hole for AP bootstrap code YYY */
1556 physmap[1] = mp_bootaddress(physmap[1] / 1024);
1558 /* look for the MP hardware - needed for apic addresses */
1563 * Maxmem isn't the "maximum memory", it's one larger than the
1564 * highest page of the physical address space. It should be
1565 * called something like "Maxphyspage". We may adjust this
1566 * based on ``hw.physmem'' and the results of the memory test.
1568 Maxmem = atop(physmap[physmap_idx + 1]);
1571 Maxmem = MAXMEM / 4;
1575 * hw.physmem is a size in bytes; we also allow k, m, and g suffixes
1576 * for the appropriate modifiers. This overrides MAXMEM.
1578 if ((cp = getenv("hw.physmem")) != NULL) {
1579 u_int64_t AllowMem, sanity;
1582 sanity = AllowMem = strtouq(cp, &ep, 0);
1583 if ((ep != cp) && (*ep != 0)) {
1596 AllowMem = sanity = 0;
1598 if (AllowMem < sanity)
1602 printf("Ignoring invalid memory size of '%s'\n", cp);
1604 Maxmem = atop(AllowMem);
1607 if (atop(physmap[physmap_idx + 1]) != Maxmem &&
1608 (boothowto & RB_VERBOSE))
1609 printf("Physical memory use set to %lluK\n", Maxmem * 4);
1612 * If Maxmem has been increased beyond what the system has detected,
1613 * extend the last memory segment to the new limit.
1615 if (atop(physmap[physmap_idx + 1]) < Maxmem)
1616 physmap[physmap_idx + 1] = ptoa(Maxmem);
1618 /* call pmap initialization to make new kernel address space */
1619 pmap_bootstrap(first, 0);
1622 * Size up each available chunk of physical memory.
1624 physmap[0] = PAGE_SIZE; /* mask off page 0 */
1626 phys_avail[pa_indx++] = physmap[0];
1627 phys_avail[pa_indx] = physmap[0];
1631 * Get dcons buffer address
1633 if (getenv_quad("dcons.addr", &dcons_addr) == 0 ||
1634 getenv_quad("dcons.size", &dcons_size) == 0)
1638 * physmap is in bytes, so when converting to page boundaries,
1639 * round up the start address and round down the end address.
1641 for (i = 0; i <= physmap_idx; i += 2) {
1645 if (physmap[i + 1] < end)
1646 end = trunc_page(physmap[i + 1]);
1647 for (pa = round_page(physmap[i]); pa < end; pa += PAGE_SIZE) {
1652 int *ptr = (int *)CADDR1;
1656 * block out kernel memory as not available.
1658 if (pa >= 0x100000 && pa < first)
1662 * block out dcons buffer
1665 && pa >= trunc_page(dcons_addr)
1666 && pa < dcons_addr + dcons_size)
1672 * map page into kernel: valid, read/write,non-cacheable
1674 *pte = pa | PG_V | PG_RW | PG_N;
1679 * Test for alternating 1's and 0's
1681 *(volatile int *)ptr = 0xaaaaaaaa;
1682 if (*(volatile int *)ptr != 0xaaaaaaaa) {
1686 * Test for alternating 0's and 1's
1688 *(volatile int *)ptr = 0x55555555;
1689 if (*(volatile int *)ptr != 0x55555555) {
1695 *(volatile int *)ptr = 0xffffffff;
1696 if (*(volatile int *)ptr != 0xffffffff) {
1702 *(volatile int *)ptr = 0x0;
1703 if (*(volatile int *)ptr != 0x0) {
1707 * Restore original value.
1712 * Adjust array of valid/good pages.
1714 if (page_bad == TRUE) {
1718 * If this good page is a continuation of the
1719 * previous set of good pages, then just increase
1720 * the end pointer. Otherwise start a new chunk.
1721 * Note that "end" points one higher than end,
1722 * making the range >= start and < end.
1723 * If we're also doing a speculative memory
1724 * test and we at or past the end, bump up Maxmem
1725 * so that we keep going. The first bad page
1726 * will terminate the loop.
1728 if (phys_avail[pa_indx] == pa) {
1729 phys_avail[pa_indx] += PAGE_SIZE;
1732 if (pa_indx >= PHYSMAP_ENTRIES*2) {
1733 printf("Too many holes in the physical address space, giving up\n");
1737 phys_avail[pa_indx++] = pa; /* start */
1738 phys_avail[pa_indx] = pa + PAGE_SIZE; /* end */
1748 * The last chunk must contain at least one page plus the message
1749 * buffer to avoid complicating other code (message buffer address
1750 * calculation, etc.).
1752 while (phys_avail[pa_indx - 1] + PAGE_SIZE +
1753 round_page(MSGBUF_SIZE) >= phys_avail[pa_indx]) {
1754 physmem -= atop(phys_avail[pa_indx] - phys_avail[pa_indx - 1]);
1755 phys_avail[pa_indx--] = 0;
1756 phys_avail[pa_indx--] = 0;
1759 Maxmem = atop(phys_avail[pa_indx]);
1761 /* Trim off space for the message buffer. */
1762 phys_avail[pa_indx] -= round_page(MSGBUF_SIZE);
1764 avail_end = phys_avail[pa_indx];
1776 * 7 Device Not Available (x87)
1778 * 9 Coprocessor Segment overrun (unsupported, reserved)
1780 * 11 Segment not present
1782 * 13 General Protection
1785 * 16 x87 FP Exception pending
1786 * 17 Alignment Check
1788 * 19 SIMD floating point
1790 * 32-255 INTn/external sources
1795 struct gate_descriptor *gdp;
1796 int gsel_tss, metadata_missing, off, x;
1797 struct mdglobaldata *gd;
1800 * Prevent lowering of the ipl if we call tsleep() early.
1802 gd = &CPU_prvspace[0].mdglobaldata;
1803 bzero(gd, sizeof(*gd));
1805 gd->mi.gd_curthread = &thread0;
1807 atdevbase = ISA_HOLE_START + KERNBASE;
1809 metadata_missing = 0;
1810 if (bootinfo.bi_modulep) {
1811 preload_metadata = (caddr_t)bootinfo.bi_modulep + KERNBASE;
1812 preload_bootstrap_relocate(KERNBASE);
1814 metadata_missing = 1;
1816 if (bootinfo.bi_envp)
1817 kern_envp = (caddr_t)bootinfo.bi_envp + KERNBASE;
1820 * start with one cpu. Note: ncpus2_shift and ncpus2_mask are left
1825 /* Init basic tunables, hz etc */
1829 * make gdt memory segments, the code segment goes up to end of the
1830 * page with etext in it, the data segment goes to the end of
1834 * XXX text protection is temporarily (?) disabled. The limit was
1835 * i386_btop(round_page(etext)) - 1.
1837 gdt_segs[GCODE_SEL].ssd_limit = atop(0 - 1);
1838 gdt_segs[GDATA_SEL].ssd_limit = atop(0 - 1);
1840 gdt_segs[GPRIV_SEL].ssd_limit =
1841 atop(sizeof(struct privatespace) - 1);
1842 gdt_segs[GPRIV_SEL].ssd_base = (int) &CPU_prvspace[0];
1843 gdt_segs[GPROC0_SEL].ssd_base =
1844 (int) &CPU_prvspace[0].mdglobaldata.gd_common_tss;
1846 gd->mi.gd_prvspace = &CPU_prvspace[0];
1849 * Note: on both UP and SMP curthread must be set non-NULL
1850 * early in the boot sequence because the system assumes
1851 * that 'curthread' is never NULL.
1854 for (x = 0; x < NGDT; x++) {
1856 /* avoid overwriting db entries with APM ones */
1857 if (x >= GAPMCODE32_SEL && x <= GAPMDATA_SEL)
1860 ssdtosd(&gdt_segs[x], &gdt[x].sd);
1863 r_gdt.rd_limit = NGDT * sizeof(gdt[0]) - 1;
1864 r_gdt.rd_base = (int) gdt;
1867 mi_gdinit(&gd->mi, 0);
1869 lwkt_init_thread(&thread0, proc0paddr, LWKT_THREAD_STACK, 0, &gd->mi);
1870 lwkt_set_comm(&thread0, "thread0");
1871 proc0.p_addr = (void *)thread0.td_kstack;
1872 LIST_INIT(&proc0.p_lwps);
1873 LIST_INSERT_HEAD(&proc0.p_lwps, &proc0.p_lwp, lwp_list);
1874 proc0.p_lwp.lwp_thread = &thread0;
1875 proc0.p_lwp.lwp_proc = &proc0;
1876 proc0.p_usched = usched_init();
1877 varsymset_init(&proc0.p_varsymset, NULL);
1878 thread0.td_flags |= TDF_RUNNING;
1879 thread0.td_proc = &proc0;
1880 thread0.td_lwp = &proc0.p_lwp;
1881 thread0.td_switch = cpu_heavy_switch; /* YYY eventually LWKT */
1882 safepri = TDPRI_MAX;
1884 /* make ldt memory segments */
1886 * XXX - VM_MAXUSER_ADDRESS is an end address, not a max. And it
1887 * should be spelled ...MAX_USER...
1889 ldt_segs[LUCODE_SEL].ssd_limit = atop(VM_MAXUSER_ADDRESS - 1);
1890 ldt_segs[LUDATA_SEL].ssd_limit = atop(VM_MAXUSER_ADDRESS - 1);
1891 for (x = 0; x < sizeof ldt_segs / sizeof ldt_segs[0]; x++)
1892 ssdtosd(&ldt_segs[x], &ldt[x].sd);
1894 _default_ldt = GSEL(GLDT_SEL, SEL_KPL);
1896 gd->gd_currentldt = _default_ldt;
1897 /* spinlocks and the BGL */
1901 for (x = 0; x < NIDT; x++) {
1902 #ifdef DEBUG_INTERRUPTS
1903 setidt(x, Xrsvdary[x], SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1905 setidt(x, &IDTVEC(rsvd0), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1908 setidt(0, &IDTVEC(div), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1909 setidt(1, &IDTVEC(dbg), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1910 setidt(2, &IDTVEC(nmi), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1911 setidt(3, &IDTVEC(bpt), SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL));
1912 setidt(4, &IDTVEC(ofl), SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL));
1913 setidt(5, &IDTVEC(bnd), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1914 setidt(6, &IDTVEC(ill), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1915 setidt(7, &IDTVEC(dna), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1916 setidt(8, 0, SDT_SYSTASKGT, SEL_KPL, GSEL(GPANIC_SEL, SEL_KPL));
1917 setidt(9, &IDTVEC(fpusegm), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1918 setidt(10, &IDTVEC(tss), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1919 setidt(11, &IDTVEC(missing), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1920 setidt(12, &IDTVEC(stk), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1921 setidt(13, &IDTVEC(prot), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1922 setidt(14, &IDTVEC(page), SDT_SYS386IGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1923 setidt(15, &IDTVEC(rsvd0), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1924 setidt(16, &IDTVEC(fpu), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1925 setidt(17, &IDTVEC(align), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1926 setidt(18, &IDTVEC(mchk), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1927 setidt(19, &IDTVEC(xmm), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1928 setidt(0x80, &IDTVEC(int0x80_syscall),
1929 SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL));
1930 setidt(0x81, &IDTVEC(int0x81_syscall),
1931 SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL));
1932 setidt(0x82, &IDTVEC(int0x82_syscall),
1933 SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL));
1935 r_idt.rd_limit = sizeof(idt0) - 1;
1936 r_idt.rd_base = (int) idt;
1940 * Initialize the console before we print anything out.
1944 if (metadata_missing)
1945 printf("WARNING: loader(8) metadata is missing!\n");
1954 if (boothowto & RB_KDB)
1955 Debugger("Boot flags requested debugger");
1958 finishidentcpu(); /* Final stage of CPU initialization */
1959 setidt(6, &IDTVEC(ill), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1960 setidt(13, &IDTVEC(prot), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1961 initializecpu(); /* Initialize CPU registers */
1964 * make an initial tss so cpu can get interrupt stack on syscall!
1965 * The 16 bytes is to save room for a VM86 context.
1967 gd->gd_common_tss.tss_esp0 = (int) thread0.td_pcb - 16;
1968 gd->gd_common_tss.tss_ss0 = GSEL(GDATA_SEL, SEL_KPL) ;
1969 gsel_tss = GSEL(GPROC0_SEL, SEL_KPL);
1970 gd->gd_tss_gdt = &gdt[GPROC0_SEL].sd;
1971 gd->gd_common_tssd = *gd->gd_tss_gdt;
1972 gd->gd_common_tss.tss_ioopt = (sizeof gd->gd_common_tss) << 16;
1975 dblfault_tss.tss_esp = dblfault_tss.tss_esp0 = dblfault_tss.tss_esp1 =
1976 dblfault_tss.tss_esp2 = (int) &dblfault_stack[sizeof(dblfault_stack)];
1977 dblfault_tss.tss_ss = dblfault_tss.tss_ss0 = dblfault_tss.tss_ss1 =
1978 dblfault_tss.tss_ss2 = GSEL(GDATA_SEL, SEL_KPL);
1979 dblfault_tss.tss_cr3 = (int)IdlePTD;
1980 dblfault_tss.tss_eip = (int) dblfault_handler;
1981 dblfault_tss.tss_eflags = PSL_KERNEL;
1982 dblfault_tss.tss_ds = dblfault_tss.tss_es =
1983 dblfault_tss.tss_gs = GSEL(GDATA_SEL, SEL_KPL);
1984 dblfault_tss.tss_fs = GSEL(GPRIV_SEL, SEL_KPL);
1985 dblfault_tss.tss_cs = GSEL(GCODE_SEL, SEL_KPL);
1986 dblfault_tss.tss_ldt = GSEL(GLDT_SEL, SEL_KPL);
1990 init_param2(physmem);
1992 /* now running on new page tables, configured,and u/iom is accessible */
1994 /* Map the message buffer. */
1995 for (off = 0; off < round_page(MSGBUF_SIZE); off += PAGE_SIZE)
1996 pmap_kenter((vm_offset_t)msgbufp + off, avail_end + off);
1998 msgbufinit(msgbufp, MSGBUF_SIZE);
2000 /* make a call gate to reenter kernel with */
2001 gdp = &ldt[LSYS5CALLS_SEL].gd;
2003 x = (int) &IDTVEC(syscall);
2004 gdp->gd_looffset = x++;
2005 gdp->gd_selector = GSEL(GCODE_SEL,SEL_KPL);
2007 gdp->gd_type = SDT_SYS386CGT;
2008 gdp->gd_dpl = SEL_UPL;
2010 gdp->gd_hioffset = ((int) &IDTVEC(syscall)) >>16;
2012 /* XXX does this work? */
2013 ldt[LBSDICALLS_SEL] = ldt[LSYS5CALLS_SEL];
2014 ldt[LSOL26CALLS_SEL] = ldt[LSYS5CALLS_SEL];
2016 /* transfer to user mode */
2018 _ucodesel = LSEL(LUCODE_SEL, SEL_UPL);
2019 _udatasel = LSEL(LUDATA_SEL, SEL_UPL);
2021 /* setup proc 0's pcb */
2022 thread0.td_pcb->pcb_flags = 0;
2023 thread0.td_pcb->pcb_cr3 = (int)IdlePTD; /* should already be setup */
2024 thread0.td_pcb->pcb_ext = 0;
2025 proc0.p_lwp.lwp_md.md_regs = &proc0_tf;
2029 * Initialize machine-dependant portions of the global data structure.
2030 * Note that the global data area and cpu0's idlestack in the private
2031 * data space were allocated in locore.
2033 * Note: the idlethread's cpl is 0
2035 * WARNING! Called from early boot, 'mycpu' may not work yet.
2038 cpu_gdinit(struct mdglobaldata *gd, int cpu)
2041 gd->mi.gd_curthread = &gd->mi.gd_idlethread;
2043 lwkt_init_thread(&gd->mi.gd_idlethread,
2044 gd->mi.gd_prvspace->idlestack,
2045 sizeof(gd->mi.gd_prvspace->idlestack),
2046 TDF_MPSAFE, &gd->mi);
2047 lwkt_set_comm(&gd->mi.gd_idlethread, "idle_%d", cpu);
2048 gd->mi.gd_idlethread.td_switch = cpu_lwkt_switch;
2049 gd->mi.gd_idlethread.td_sp -= sizeof(void *);
2050 *(void **)gd->mi.gd_idlethread.td_sp = cpu_idle_restore;
2054 is_globaldata_space(vm_offset_t saddr, vm_offset_t eaddr)
2056 if (saddr >= (vm_offset_t)&CPU_prvspace[0] &&
2057 eaddr <= (vm_offset_t)&CPU_prvspace[MAXCPU]) {
2064 globaldata_find(int cpu)
2066 KKASSERT(cpu >= 0 && cpu < ncpus);
2067 return(&CPU_prvspace[cpu].mdglobaldata.mi);
2070 #if defined(I586_CPU) && !defined(NO_F00F_HACK)
2071 static void f00f_hack(void *unused);
2072 SYSINIT(f00f_hack, SI_SUB_INTRINSIC, SI_ORDER_FIRST, f00f_hack, NULL);
2075 f00f_hack(void *unused)
2077 struct gate_descriptor *new_idt;
2083 printf("Intel Pentium detected, installing workaround for F00F bug\n");
2085 r_idt.rd_limit = sizeof(idt0) - 1;
2087 tmp = kmem_alloc(kernel_map, PAGE_SIZE * 2);
2089 panic("kmem_alloc returned 0");
2090 if (((unsigned int)tmp & (PAGE_SIZE-1)) != 0)
2091 panic("kmem_alloc returned non-page-aligned memory");
2092 /* Put the first seven entries in the lower page */
2093 new_idt = (struct gate_descriptor*)(tmp + PAGE_SIZE - (7*8));
2094 bcopy(idt, new_idt, sizeof(idt0));
2095 r_idt.rd_base = (int)new_idt;
2098 if (vm_map_protect(kernel_map, tmp, tmp + PAGE_SIZE,
2099 VM_PROT_READ, FALSE) != KERN_SUCCESS)
2100 panic("vm_map_protect failed");
2103 #endif /* defined(I586_CPU) && !NO_F00F_HACK */
2106 ptrace_set_pc(p, addr)
2110 p->p_md.md_regs->tf_eip = addr;
2115 ptrace_single_step(struct lwp *lp)
2117 lp->lwp_md.md_regs->tf_eflags |= PSL_T;
2121 int ptrace_read_u_check(p, addr, len)
2128 if ((vm_offset_t) (addr + len) < addr)
2130 if ((vm_offset_t) (addr + len) <= sizeof(struct user))
2133 gap = (char *) p->p_md.md_regs - (char *) p->p_addr;
2135 if ((vm_offset_t) addr < gap)
2137 if ((vm_offset_t) (addr + len) <=
2138 (vm_offset_t) (gap + sizeof(struct trapframe)))
2143 int ptrace_write_u(p, off, data)
2148 struct trapframe frame_copy;
2150 struct trapframe *tp;
2153 * Privileged kernel state is scattered all over the user area.
2154 * Only allow write access to parts of regs and to fpregs.
2156 min = (char *)p->p_md.md_regs - (char *)p->p_addr;
2157 if (off >= min && off <= min + sizeof(struct trapframe) - sizeof(int)) {
2158 tp = p->p_md.md_regs;
2160 *(int *)((char *)&frame_copy + (off - min)) = data;
2161 if (!EFL_SECURE(frame_copy.tf_eflags, tp->tf_eflags) ||
2162 !CS_SECURE(frame_copy.tf_cs))
2164 *(int*)((char *)p->p_addr + off) = data;
2169 * The PCB is at the end of the user area YYY
2171 min = (char *)p->p_thread->td_pcb - (char *)p->p_addr;
2172 min += offsetof(struct pcb, pcb_save);
2173 if (off >= min && off <= min + sizeof(union savefpu) - sizeof(int)) {
2174 *(int*)((char *)p->p_addr + off) = data;
2181 fill_regs(struct lwp *lp, struct reg *regs)
2184 struct trapframe *tp;
2186 tp = lp->lwp_md.md_regs;
2187 regs->r_fs = tp->tf_fs;
2188 regs->r_es = tp->tf_es;
2189 regs->r_ds = tp->tf_ds;
2190 regs->r_edi = tp->tf_edi;
2191 regs->r_esi = tp->tf_esi;
2192 regs->r_ebp = tp->tf_ebp;
2193 regs->r_ebx = tp->tf_ebx;
2194 regs->r_edx = tp->tf_edx;
2195 regs->r_ecx = tp->tf_ecx;
2196 regs->r_eax = tp->tf_eax;
2197 regs->r_eip = tp->tf_eip;
2198 regs->r_cs = tp->tf_cs;
2199 regs->r_eflags = tp->tf_eflags;
2200 regs->r_esp = tp->tf_esp;
2201 regs->r_ss = tp->tf_ss;
2202 pcb = lp->lwp_thread->td_pcb;
2203 regs->r_gs = pcb->pcb_gs;
2208 set_regs(struct lwp *lp, struct reg *regs)
2211 struct trapframe *tp;
2213 tp = lp->lwp_md.md_regs;
2214 if (!EFL_SECURE(regs->r_eflags, tp->tf_eflags) ||
2215 !CS_SECURE(regs->r_cs))
2217 tp->tf_fs = regs->r_fs;
2218 tp->tf_es = regs->r_es;
2219 tp->tf_ds = regs->r_ds;
2220 tp->tf_edi = regs->r_edi;
2221 tp->tf_esi = regs->r_esi;
2222 tp->tf_ebp = regs->r_ebp;
2223 tp->tf_ebx = regs->r_ebx;
2224 tp->tf_edx = regs->r_edx;
2225 tp->tf_ecx = regs->r_ecx;
2226 tp->tf_eax = regs->r_eax;
2227 tp->tf_eip = regs->r_eip;
2228 tp->tf_cs = regs->r_cs;
2229 tp->tf_eflags = regs->r_eflags;
2230 tp->tf_esp = regs->r_esp;
2231 tp->tf_ss = regs->r_ss;
2232 pcb = lp->lwp_thread->td_pcb;
2233 pcb->pcb_gs = regs->r_gs;
2237 #ifndef CPU_DISABLE_SSE
2239 fill_fpregs_xmm(sv_xmm, sv_87)
2240 struct savexmm *sv_xmm;
2241 struct save87 *sv_87;
2243 struct env87 *penv_87 = &sv_87->sv_env;
2244 struct envxmm *penv_xmm = &sv_xmm->sv_env;
2247 /* FPU control/status */
2248 penv_87->en_cw = penv_xmm->en_cw;
2249 penv_87->en_sw = penv_xmm->en_sw;
2250 penv_87->en_tw = penv_xmm->en_tw;
2251 penv_87->en_fip = penv_xmm->en_fip;
2252 penv_87->en_fcs = penv_xmm->en_fcs;
2253 penv_87->en_opcode = penv_xmm->en_opcode;
2254 penv_87->en_foo = penv_xmm->en_foo;
2255 penv_87->en_fos = penv_xmm->en_fos;
2258 for (i = 0; i < 8; ++i)
2259 sv_87->sv_ac[i] = sv_xmm->sv_fp[i].fp_acc;
2261 sv_87->sv_ex_sw = sv_xmm->sv_ex_sw;
2265 set_fpregs_xmm(sv_87, sv_xmm)
2266 struct save87 *sv_87;
2267 struct savexmm *sv_xmm;
2269 struct env87 *penv_87 = &sv_87->sv_env;
2270 struct envxmm *penv_xmm = &sv_xmm->sv_env;
2273 /* FPU control/status */
2274 penv_xmm->en_cw = penv_87->en_cw;
2275 penv_xmm->en_sw = penv_87->en_sw;
2276 penv_xmm->en_tw = penv_87->en_tw;
2277 penv_xmm->en_fip = penv_87->en_fip;
2278 penv_xmm->en_fcs = penv_87->en_fcs;
2279 penv_xmm->en_opcode = penv_87->en_opcode;
2280 penv_xmm->en_foo = penv_87->en_foo;
2281 penv_xmm->en_fos = penv_87->en_fos;
2284 for (i = 0; i < 8; ++i)
2285 sv_xmm->sv_fp[i].fp_acc = sv_87->sv_ac[i];
2287 sv_xmm->sv_ex_sw = sv_87->sv_ex_sw;
2289 #endif /* CPU_DISABLE_SSE */
2292 fill_fpregs(struct lwp *lp, struct fpreg *fpregs)
2294 #ifndef CPU_DISABLE_SSE
2296 fill_fpregs_xmm(&lp->lwp_thread->td_pcb->pcb_save.sv_xmm,
2297 (struct save87 *)fpregs);
2300 #endif /* CPU_DISABLE_SSE */
2301 bcopy(&lp->lwp_thread->td_pcb->pcb_save.sv_87, fpregs, sizeof *fpregs);
2306 set_fpregs(struct lwp *lp, struct fpreg *fpregs)
2308 #ifndef CPU_DISABLE_SSE
2310 set_fpregs_xmm((struct save87 *)fpregs,
2311 &lp->lwp_thread->td_pcb->pcb_save.sv_xmm);
2314 #endif /* CPU_DISABLE_SSE */
2315 bcopy(fpregs, &lp->lwp_thread->td_pcb->pcb_save.sv_87, sizeof *fpregs);
2320 fill_dbregs(struct lwp *lp, struct dbreg *dbregs)
2323 dbregs->dr0 = rdr0();
2324 dbregs->dr1 = rdr1();
2325 dbregs->dr2 = rdr2();
2326 dbregs->dr3 = rdr3();
2327 dbregs->dr4 = rdr4();
2328 dbregs->dr5 = rdr5();
2329 dbregs->dr6 = rdr6();
2330 dbregs->dr7 = rdr7();
2334 pcb = lp->lwp_thread->td_pcb;
2335 dbregs->dr0 = pcb->pcb_dr0;
2336 dbregs->dr1 = pcb->pcb_dr1;
2337 dbregs->dr2 = pcb->pcb_dr2;
2338 dbregs->dr3 = pcb->pcb_dr3;
2341 dbregs->dr6 = pcb->pcb_dr6;
2342 dbregs->dr7 = pcb->pcb_dr7;
2348 set_dbregs(struct lwp *lp, struct dbreg *dbregs)
2351 load_dr0(dbregs->dr0);
2352 load_dr1(dbregs->dr1);
2353 load_dr2(dbregs->dr2);
2354 load_dr3(dbregs->dr3);
2355 load_dr4(dbregs->dr4);
2356 load_dr5(dbregs->dr5);
2357 load_dr6(dbregs->dr6);
2358 load_dr7(dbregs->dr7);
2361 struct ucred *ucred;
2363 uint32_t mask1, mask2;
2366 * Don't let an illegal value for dr7 get set. Specifically,
2367 * check for undefined settings. Setting these bit patterns
2368 * result in undefined behaviour and can lead to an unexpected
2371 for (i = 0, mask1 = 0x3<<16, mask2 = 0x2<<16; i < 8;
2372 i++, mask1 <<= 2, mask2 <<= 2)
2373 if ((dbregs->dr7 & mask1) == mask2)
2376 pcb = lp->lwp_thread->td_pcb;
2377 ucred = lp->lwp_proc->p_ucred;
2380 * Don't let a process set a breakpoint that is not within the
2381 * process's address space. If a process could do this, it
2382 * could halt the system by setting a breakpoint in the kernel
2383 * (if ddb was enabled). Thus, we need to check to make sure
2384 * that no breakpoints are being enabled for addresses outside
2385 * process's address space, unless, perhaps, we were called by
2388 * XXX - what about when the watched area of the user's
2389 * address space is written into from within the kernel
2390 * ... wouldn't that still cause a breakpoint to be generated
2391 * from within kernel mode?
2394 if (suser_cred(ucred, 0) != 0) {
2395 if (dbregs->dr7 & 0x3) {
2396 /* dr0 is enabled */
2397 if (dbregs->dr0 >= VM_MAXUSER_ADDRESS)
2401 if (dbregs->dr7 & (0x3<<2)) {
2402 /* dr1 is enabled */
2403 if (dbregs->dr1 >= VM_MAXUSER_ADDRESS)
2407 if (dbregs->dr7 & (0x3<<4)) {
2408 /* dr2 is enabled */
2409 if (dbregs->dr2 >= VM_MAXUSER_ADDRESS)
2413 if (dbregs->dr7 & (0x3<<6)) {
2414 /* dr3 is enabled */
2415 if (dbregs->dr3 >= VM_MAXUSER_ADDRESS)
2420 pcb->pcb_dr0 = dbregs->dr0;
2421 pcb->pcb_dr1 = dbregs->dr1;
2422 pcb->pcb_dr2 = dbregs->dr2;
2423 pcb->pcb_dr3 = dbregs->dr3;
2424 pcb->pcb_dr6 = dbregs->dr6;
2425 pcb->pcb_dr7 = dbregs->dr7;
2427 pcb->pcb_flags |= PCB_DBREGS;
2434 * Return > 0 if a hardware breakpoint has been hit, and the
2435 * breakpoint was in user space. Return 0, otherwise.
2438 user_dbreg_trap(void)
2440 u_int32_t dr7, dr6; /* debug registers dr6 and dr7 */
2441 u_int32_t bp; /* breakpoint bits extracted from dr6 */
2442 int nbp; /* number of breakpoints that triggered */
2443 caddr_t addr[4]; /* breakpoint addresses */
2447 if ((dr7 & 0x000000ff) == 0) {
2449 * all GE and LE bits in the dr7 register are zero,
2450 * thus the trap couldn't have been caused by the
2451 * hardware debug registers
2458 bp = dr6 & 0x0000000f;
2462 * None of the breakpoint bits are set meaning this
2463 * trap was not caused by any of the debug registers
2469 * at least one of the breakpoints were hit, check to see
2470 * which ones and if any of them are user space addresses
2474 addr[nbp++] = (caddr_t)rdr0();
2477 addr[nbp++] = (caddr_t)rdr1();
2480 addr[nbp++] = (caddr_t)rdr2();
2483 addr[nbp++] = (caddr_t)rdr3();
2486 for (i=0; i<nbp; i++) {
2488 (caddr_t)VM_MAXUSER_ADDRESS) {
2490 * addr[i] is in user space
2497 * None of the breakpoints are in user space.
2505 Debugger(const char *msg)
2507 printf("Debugger(\"%s\") called.\n", msg);
2511 #include <sys/disklabel.h>
2514 * Determine the size of the transfer, and make sure it is
2515 * within the boundaries of the partition. Adjust transfer
2516 * if needed, and signal errors or early completion.
2518 * On success a new bio layer is pushed with the translated
2519 * block number, and returned.
2522 bounds_check_with_label(dev_t dev, struct bio *bio,
2523 struct disklabel *lp, int wlabel)
2526 struct buf *bp = bio->bio_buf;
2527 struct partition *p = lp->d_partitions + dkpart(dev);
2528 int labelsect = lp->d_partitions[0].p_offset;
2529 int maxsz = p->p_size,
2530 sz = (bp->b_bcount + DEV_BSIZE - 1) >> DEV_BSHIFT;
2532 /* overwriting disk label ? */
2533 /* XXX should also protect bootstrap in first 8K */
2534 if (bio->bio_blkno + p->p_offset <= LABELSECTOR + labelsect &&
2535 #if LABELSECTOR != 0
2536 bio->bio_blkno + p->p_offset + sz > LABELSECTOR + labelsect &&
2538 (bp->b_flags & B_READ) == 0 && wlabel == 0) {
2539 bp->b_error = EROFS;
2543 #if defined(DOSBBSECTOR) && defined(notyet)
2544 /* overwriting master boot record? */
2545 if (bio->bio_blkno + p->p_offset <= DOSBBSECTOR &&
2546 (bp->b_flags & B_READ) == 0 && wlabel == 0) {
2547 bp->b_error = EROFS;
2552 /* beyond partition? */
2553 if (bio->bio_blkno < 0 || bio->bio_blkno + sz > maxsz) {
2554 /* if exactly at end of disk, return an EOF */
2555 if (bio->bio_blkno == maxsz) {
2556 bp->b_resid = bp->b_bcount;
2559 /* or truncate if part of it fits */
2560 sz = maxsz - bio->bio_blkno;
2562 bp->b_error = EINVAL;
2565 bp->b_bcount = sz << DEV_BSHIFT;
2567 nbio = push_bio(bio);
2568 nbio->bio_blkno = bio->bio_blkno + p->p_offset;
2572 bp->b_flags |= B_ERROR;
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 /* Make FAST_INTR() routines sequential */
2635 struct spinlock_deprecated fast_intr_spinlock;
2637 /* critical region for old style disable_intr/enable_intr */
2638 struct spinlock_deprecated mpintr_spinlock;
2640 /* critical region around INTR() routines */
2641 struct spinlock_deprecated intr_spinlock;
2643 /* lock region used by kernel profiling */
2644 struct spinlock_deprecated mcount_spinlock;
2646 /* locks com (tty) data/hardware accesses: a FASTINTR() */
2647 struct spinlock_deprecated com_spinlock;
2649 /* locks kernel printfs */
2650 struct spinlock_deprecated cons_spinlock;
2652 /* lock regions around the clock hardware */
2653 struct spinlock_deprecated clock_spinlock;
2655 /* lock around the MP rendezvous */
2656 struct spinlock_deprecated smp_rv_spinlock;
2662 * mp_lock = 0; BSP already owns the MP lock
2665 * Get the initial mp_lock with a count of 1 for the BSP.
2666 * This uses a LOGICAL cpu ID, ie BSP == 0.
2669 cpu_get_initial_mplock();
2672 spin_lock_init(&mcount_spinlock);
2673 spin_lock_init(&fast_intr_spinlock);
2674 spin_lock_init(&intr_spinlock);
2675 spin_lock_init(&mpintr_spinlock);
2676 spin_lock_init(&imen_spinlock);
2677 spin_lock_init(&smp_rv_spinlock);
2678 spin_lock_init(&com_spinlock);
2679 spin_lock_init(&clock_spinlock);
2680 spin_lock_init(&cons_spinlock);
2682 /* our token pool needs to work early */
2683 lwkt_token_pool_init();