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 1.32 2003/08/07 21:17:22 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_user_ldt.h"
58 #include "opt_userconfig.h"
60 #include <sys/param.h>
61 #include <sys/systm.h>
62 #include <sys/sysproto.h>
63 #include <sys/signalvar.h>
64 #include <sys/kernel.h>
65 #include <sys/linker.h>
66 #include <sys/malloc.h>
69 #include <sys/reboot.h>
70 #include <sys/callout.h>
72 #include <sys/msgbuf.h>
73 #include <sys/sysent.h>
74 #include <sys/sysctl.h>
75 #include <sys/vmmeter.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 */
106 #include <machine/smp.h>
109 #include <machine/perfmon.h>
111 #include <machine/cputypes.h>
114 #include <bus/isa/i386/isa_device.h>
116 #include <i386/isa/intr_machdep.h>
117 #include <bus/isa/rtc.h>
118 #include <machine/vm86.h>
119 #include <sys/random.h>
120 #include <sys/ptrace.h>
121 #include <machine/sigframe.h>
123 extern void init386 __P((int first));
124 extern void dblfault_handler __P((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 __P((void *));
132 #ifndef CPU_DISABLE_SSE
133 static void set_fpregs_xmm __P((struct save87 *, struct savexmm *));
134 static void fill_fpregs_xmm __P((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 static MALLOC_DEFINE(M_MBUF, "mbuf", "mbuf");
145 int _udatasel, _ucodesel;
148 #if defined(SWTCH_OPTIM_STATS)
149 extern int swtch_optim_stats;
150 SYSCTL_INT(_debug, OID_AUTO, swtch_optim_stats,
151 CTLFLAG_RD, &swtch_optim_stats, 0, "");
152 SYSCTL_INT(_debug, OID_AUTO, tlb_flush_count,
153 CTLFLAG_RD, &tlb_flush_count, 0, "");
157 static int ispc98 = 1;
159 static int ispc98 = 0;
161 SYSCTL_INT(_machdep, OID_AUTO, ispc98, CTLFLAG_RD, &ispc98, 0, "");
167 sysctl_hw_physmem(SYSCTL_HANDLER_ARGS)
169 int error = sysctl_handle_int(oidp, 0, ctob(physmem), req);
173 SYSCTL_PROC(_hw, HW_PHYSMEM, physmem, CTLTYPE_INT|CTLFLAG_RD,
174 0, 0, sysctl_hw_physmem, "IU", "");
177 sysctl_hw_usermem(SYSCTL_HANDLER_ARGS)
179 int error = sysctl_handle_int(oidp, 0,
180 ctob(physmem - vmstats.v_wire_count), req);
184 SYSCTL_PROC(_hw, HW_USERMEM, usermem, CTLTYPE_INT|CTLFLAG_RD,
185 0, 0, sysctl_hw_usermem, "IU", "");
188 sysctl_hw_availpages(SYSCTL_HANDLER_ARGS)
190 int error = sysctl_handle_int(oidp, 0,
191 i386_btop(avail_end - avail_start), req);
195 SYSCTL_PROC(_hw, OID_AUTO, availpages, CTLTYPE_INT|CTLFLAG_RD,
196 0, 0, sysctl_hw_availpages, "I", "");
199 sysctl_machdep_msgbuf(SYSCTL_HANDLER_ARGS)
203 /* Unwind the buffer, so that it's linear (possibly starting with
204 * some initial nulls).
206 error=sysctl_handle_opaque(oidp,msgbufp->msg_ptr+msgbufp->msg_bufr,
207 msgbufp->msg_size-msgbufp->msg_bufr,req);
208 if(error) return(error);
209 if(msgbufp->msg_bufr>0) {
210 error=sysctl_handle_opaque(oidp,msgbufp->msg_ptr,
211 msgbufp->msg_bufr,req);
216 SYSCTL_PROC(_machdep, OID_AUTO, msgbuf, CTLTYPE_STRING|CTLFLAG_RD,
217 0, 0, sysctl_machdep_msgbuf, "A","Contents of kernel message buffer");
219 static int msgbuf_clear;
222 sysctl_machdep_msgbuf_clear(SYSCTL_HANDLER_ARGS)
225 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2,
227 if (!error && req->newptr) {
228 /* Clear the buffer and reset write pointer */
229 bzero(msgbufp->msg_ptr,msgbufp->msg_size);
230 msgbufp->msg_bufr=msgbufp->msg_bufx=0;
236 SYSCTL_PROC(_machdep, OID_AUTO, msgbuf_clear, CTLTYPE_INT|CTLFLAG_RW,
237 &msgbuf_clear, 0, sysctl_machdep_msgbuf_clear, "I",
238 "Clear kernel message buffer");
240 int bootverbose = 0, Maxmem = 0;
243 vm_offset_t phys_avail[10];
245 /* must be 2 less so 0 0 can signal end of chunks */
246 #define PHYS_AVAIL_ARRAY_END ((sizeof(phys_avail) / sizeof(vm_offset_t)) - 2)
248 static vm_offset_t buffer_sva, buffer_eva;
249 vm_offset_t clean_sva, clean_eva;
250 static vm_offset_t pager_sva, pager_eva;
251 static struct trapframe proc0_tf;
264 if (boothowto & RB_VERBOSE)
268 * Good {morning,afternoon,evening,night}.
270 printf("%s", version);
273 panicifcpuunsupported();
277 printf("real memory = %u (%uK bytes)\n", ptoa(Maxmem), ptoa(Maxmem) / 1024);
279 * Display any holes after the first chunk of extended memory.
284 printf("Physical memory chunk(s):\n");
285 for (indx = 0; phys_avail[indx + 1] != 0; indx += 2) {
286 unsigned int size1 = phys_avail[indx + 1] - phys_avail[indx];
288 printf("0x%08x - 0x%08x, %u bytes (%u pages)\n",
289 phys_avail[indx], phys_avail[indx + 1] - 1, size1,
295 * Calculate callout wheel size
297 for (callwheelsize = 1, callwheelbits = 0;
298 callwheelsize < ncallout;
299 callwheelsize <<= 1, ++callwheelbits)
301 callwheelmask = callwheelsize - 1;
304 * Allocate space for system data structures.
305 * The first available kernel virtual address is in "v".
306 * As pages of kernel virtual memory are allocated, "v" is incremented.
307 * As pages of memory are allocated and cleared,
308 * "firstaddr" is incremented.
309 * An index into the kernel page table corresponding to the
310 * virtual memory address maintained in "v" is kept in "mapaddr".
314 * Make two passes. The first pass calculates how much memory is
315 * needed and allocates it. The second pass assigns virtual
316 * addresses to the various data structures.
320 v = (caddr_t)firstaddr;
322 #define valloc(name, type, num) \
323 (name) = (type *)v; v = (caddr_t)((name)+(num))
324 #define valloclim(name, type, num, lim) \
325 (name) = (type *)v; v = (caddr_t)((lim) = ((name)+(num)))
327 valloc(callout, struct callout, ncallout);
328 valloc(callwheel, struct callout_tailq, callwheelsize);
331 * The nominal buffer size (and minimum KVA allocation) is BKVASIZE.
332 * For the first 64MB of ram nominally allocate sufficient buffers to
333 * cover 1/4 of our ram. Beyond the first 64MB allocate additional
334 * buffers to cover 1/20 of our ram over 64MB. When auto-sizing
335 * the buffer cache we limit the eventual kva reservation to
338 * factor represents the 1/4 x ram conversion.
341 int factor = 4 * BKVASIZE / 1024;
342 int kbytes = physmem * (PAGE_SIZE / 1024);
346 nbuf += min((kbytes - 4096) / factor, 65536 / factor);
348 nbuf += (kbytes - 65536) * 2 / (factor * 5);
349 if (maxbcache && nbuf > maxbcache / BKVASIZE)
350 nbuf = maxbcache / BKVASIZE;
354 * Do not allow the buffer_map to be more then 1/2 the size of the
357 if (nbuf > (kernel_map->max_offset - kernel_map->min_offset) /
359 nbuf = (kernel_map->max_offset - kernel_map->min_offset) /
361 printf("Warning: nbufs capped at %d\n", nbuf);
364 nswbuf = max(min(nbuf/4, 256), 16);
366 if (nswbuf < NSWBUF_MIN)
373 valloc(swbuf, struct buf, nswbuf);
374 valloc(buf, struct buf, nbuf);
378 * End of first pass, size has been calculated so allocate memory
380 if (firstaddr == 0) {
381 size = (vm_size_t)(v - firstaddr);
382 firstaddr = (int)kmem_alloc(kernel_map, round_page(size));
384 panic("startup: no room for tables");
389 * End of second pass, addresses have been assigned
391 if ((vm_size_t)(v - firstaddr) != size)
392 panic("startup: table size inconsistency");
394 clean_map = kmem_suballoc(kernel_map, &clean_sva, &clean_eva,
395 (nbuf*BKVASIZE) + (nswbuf*MAXPHYS) + pager_map_size);
396 buffer_map = kmem_suballoc(clean_map, &buffer_sva, &buffer_eva,
398 buffer_map->system_map = 1;
399 pager_map = kmem_suballoc(clean_map, &pager_sva, &pager_eva,
400 (nswbuf*MAXPHYS) + pager_map_size);
401 pager_map->system_map = 1;
402 exec_map = kmem_suballoc(kernel_map, &minaddr, &maxaddr,
403 (16*(ARG_MAX+(PAGE_SIZE*3))));
406 * Finally, allocate mbuf pool. Since mclrefcnt is an off-size
407 * we use the more space efficient malloc in place of kmem_alloc.
410 vm_offset_t mb_map_size;
412 mb_map_size = nmbufs * MSIZE + nmbclusters * MCLBYTES;
413 mb_map_size = roundup2(mb_map_size, max(MCLBYTES, PAGE_SIZE));
414 mclrefcnt = malloc(mb_map_size / MCLBYTES, M_MBUF, M_NOWAIT);
415 bzero(mclrefcnt, mb_map_size / MCLBYTES);
416 mb_map = kmem_suballoc(kmem_map, (vm_offset_t *)&mbutl, &maxaddr,
418 mb_map->system_map = 1;
422 * Initialize callouts
424 SLIST_INIT(&callfree);
425 for (i = 0; i < ncallout; i++) {
426 callout_init(&callout[i]);
427 callout[i].c_flags = CALLOUT_LOCAL_ALLOC;
428 SLIST_INSERT_HEAD(&callfree, &callout[i], c_links.sle);
431 for (i = 0; i < callwheelsize; i++) {
432 TAILQ_INIT(&callwheel[i]);
435 #if defined(USERCONFIG)
437 cninit(); /* the preferred console may have changed */
440 printf("avail memory = %u (%uK bytes)\n", ptoa(vmstats.v_free_count),
441 ptoa(vmstats.v_free_count) / 1024);
444 * Set up buffers, so they can be used to read disk labels.
447 vm_pager_bufferinit();
451 * OK, enough kmem_alloc/malloc state should be up, lets get on with it!
453 mp_start(); /* fire up the APs and APICs */
460 * Send an interrupt to process.
462 * Stack is set up to allow sigcode stored
463 * at top to call routine, followed by kcall
464 * to sigreturn routine below. After sigreturn
465 * resets the signal mask, the stack, and the
466 * frame pointer, it returns to the user
470 osendsig(sig_t catcher, int sig, sigset_t *mask, u_long code)
472 struct proc *p = curproc;
473 struct trapframe *regs;
474 struct osigframe *fp;
476 struct sigacts *psp = p->p_sigacts;
479 regs = p->p_md.md_regs;
480 oonstack = (p->p_sigstk.ss_flags & SS_ONSTACK) ? 1 : 0;
482 /* Allocate and validate space for the signal handler context. */
483 if ((p->p_flag & P_ALTSTACK) && !oonstack &&
484 SIGISMEMBER(psp->ps_sigonstack, sig)) {
485 fp = (struct osigframe *)(p->p_sigstk.ss_sp +
486 p->p_sigstk.ss_size - sizeof(struct osigframe));
487 p->p_sigstk.ss_flags |= SS_ONSTACK;
490 fp = (struct osigframe *)regs->tf_esp - 1;
492 /* Translate the signal if appropriate */
493 if (p->p_sysent->sv_sigtbl) {
494 if (sig <= p->p_sysent->sv_sigsize)
495 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)];
498 /* Build the argument list for the signal handler. */
500 sf.sf_scp = (register_t)&fp->sf_siginfo.si_sc;
501 if (SIGISMEMBER(p->p_sigacts->ps_siginfo, sig)) {
502 /* Signal handler installed with SA_SIGINFO. */
503 sf.sf_arg2 = (register_t)&fp->sf_siginfo;
504 sf.sf_siginfo.si_signo = sig;
505 sf.sf_siginfo.si_code = code;
506 sf.sf_ahu.sf_action = (__osiginfohandler_t *)catcher;
509 /* Old FreeBSD-style arguments. */
511 sf.sf_addr = regs->tf_err;
512 sf.sf_ahu.sf_handler = catcher;
515 /* save scratch registers */
516 sf.sf_siginfo.si_sc.sc_eax = regs->tf_eax;
517 sf.sf_siginfo.si_sc.sc_ebx = regs->tf_ebx;
518 sf.sf_siginfo.si_sc.sc_ecx = regs->tf_ecx;
519 sf.sf_siginfo.si_sc.sc_edx = regs->tf_edx;
520 sf.sf_siginfo.si_sc.sc_esi = regs->tf_esi;
521 sf.sf_siginfo.si_sc.sc_edi = regs->tf_edi;
522 sf.sf_siginfo.si_sc.sc_cs = regs->tf_cs;
523 sf.sf_siginfo.si_sc.sc_ds = regs->tf_ds;
524 sf.sf_siginfo.si_sc.sc_ss = regs->tf_ss;
525 sf.sf_siginfo.si_sc.sc_es = regs->tf_es;
526 sf.sf_siginfo.si_sc.sc_fs = regs->tf_fs;
527 sf.sf_siginfo.si_sc.sc_gs = rgs();
528 sf.sf_siginfo.si_sc.sc_isp = regs->tf_isp;
530 /* Build the signal context to be used by sigreturn. */
531 sf.sf_siginfo.si_sc.sc_onstack = oonstack;
532 SIG2OSIG(*mask, sf.sf_siginfo.si_sc.sc_mask);
533 sf.sf_siginfo.si_sc.sc_sp = regs->tf_esp;
534 sf.sf_siginfo.si_sc.sc_fp = regs->tf_ebp;
535 sf.sf_siginfo.si_sc.sc_pc = regs->tf_eip;
536 sf.sf_siginfo.si_sc.sc_ps = regs->tf_eflags;
537 sf.sf_siginfo.si_sc.sc_trapno = regs->tf_trapno;
538 sf.sf_siginfo.si_sc.sc_err = regs->tf_err;
541 * If we're a vm86 process, we want to save the segment registers.
542 * We also change eflags to be our emulated eflags, not the actual
545 if (regs->tf_eflags & PSL_VM) {
546 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs;
547 struct vm86_kernel *vm86 = &p->p_thread->td_pcb->pcb_ext->ext_vm86;
549 sf.sf_siginfo.si_sc.sc_gs = tf->tf_vm86_gs;
550 sf.sf_siginfo.si_sc.sc_fs = tf->tf_vm86_fs;
551 sf.sf_siginfo.si_sc.sc_es = tf->tf_vm86_es;
552 sf.sf_siginfo.si_sc.sc_ds = tf->tf_vm86_ds;
554 if (vm86->vm86_has_vme == 0)
555 sf.sf_siginfo.si_sc.sc_ps =
556 (tf->tf_eflags & ~(PSL_VIF | PSL_VIP))
557 | (vm86->vm86_eflags & (PSL_VIF | PSL_VIP));
558 /* see sendsig for comment */
559 tf->tf_eflags &= ~(PSL_VM | PSL_NT | PSL_VIF | PSL_VIP);
562 /* Copy the sigframe out to the user's stack. */
563 if (copyout(&sf, fp, sizeof(struct osigframe)) != 0) {
565 * Something is wrong with the stack pointer.
566 * ...Kill the process.
571 regs->tf_esp = (int)fp;
572 regs->tf_eip = PS_STRINGS - szosigcode;
573 regs->tf_eflags &= ~PSL_T;
574 regs->tf_cs = _ucodesel;
575 regs->tf_ds = _udatasel;
576 regs->tf_es = _udatasel;
577 regs->tf_fs = _udatasel;
579 regs->tf_ss = _udatasel;
583 sendsig(catcher, sig, mask, code)
589 struct proc *p = curproc;
590 struct trapframe *regs;
591 struct sigacts *psp = p->p_sigacts;
592 struct sigframe sf, *sfp;
595 if (SIGISMEMBER(psp->ps_osigset, sig)) {
596 osendsig(catcher, sig, mask, code);
600 regs = p->p_md.md_regs;
601 oonstack = (p->p_sigstk.ss_flags & SS_ONSTACK) ? 1 : 0;
603 /* save user context */
604 bzero(&sf, sizeof(struct sigframe));
605 sf.sf_uc.uc_sigmask = *mask;
606 sf.sf_uc.uc_stack = p->p_sigstk;
607 sf.sf_uc.uc_mcontext.mc_onstack = oonstack;
608 sf.sf_uc.uc_mcontext.mc_gs = rgs();
609 bcopy(regs, &sf.sf_uc.uc_mcontext.mc_fs, sizeof(struct trapframe));
611 /* Allocate and validate space for the signal handler context. */
612 if ((p->p_flag & P_ALTSTACK) != 0 && !oonstack &&
613 SIGISMEMBER(psp->ps_sigonstack, sig)) {
614 sfp = (struct sigframe *)(p->p_sigstk.ss_sp +
615 p->p_sigstk.ss_size - sizeof(struct sigframe));
616 p->p_sigstk.ss_flags |= SS_ONSTACK;
619 sfp = (struct sigframe *)regs->tf_esp - 1;
621 /* Translate the signal is appropriate */
622 if (p->p_sysent->sv_sigtbl) {
623 if (sig <= p->p_sysent->sv_sigsize)
624 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)];
627 /* Build the argument list for the signal handler. */
629 sf.sf_ucontext = (register_t)&sfp->sf_uc;
630 if (SIGISMEMBER(p->p_sigacts->ps_siginfo, sig)) {
631 /* Signal handler installed with SA_SIGINFO. */
632 sf.sf_siginfo = (register_t)&sfp->sf_si;
633 sf.sf_ahu.sf_action = (__siginfohandler_t *)catcher;
635 /* fill siginfo structure */
636 sf.sf_si.si_signo = sig;
637 sf.sf_si.si_code = code;
638 sf.sf_si.si_addr = (void*)regs->tf_err;
641 /* Old FreeBSD-style arguments. */
642 sf.sf_siginfo = code;
643 sf.sf_addr = regs->tf_err;
644 sf.sf_ahu.sf_handler = catcher;
648 * If we're a vm86 process, we want to save the segment registers.
649 * We also change eflags to be our emulated eflags, not the actual
652 if (regs->tf_eflags & PSL_VM) {
653 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs;
654 struct vm86_kernel *vm86 = &p->p_thread->td_pcb->pcb_ext->ext_vm86;
656 sf.sf_uc.uc_mcontext.mc_gs = tf->tf_vm86_gs;
657 sf.sf_uc.uc_mcontext.mc_fs = tf->tf_vm86_fs;
658 sf.sf_uc.uc_mcontext.mc_es = tf->tf_vm86_es;
659 sf.sf_uc.uc_mcontext.mc_ds = tf->tf_vm86_ds;
661 if (vm86->vm86_has_vme == 0)
662 sf.sf_uc.uc_mcontext.mc_eflags =
663 (tf->tf_eflags & ~(PSL_VIF | PSL_VIP)) |
664 (vm86->vm86_eflags & (PSL_VIF | PSL_VIP));
667 * Clear PSL_NT to inhibit T_TSSFLT faults on return from
668 * syscalls made by the signal handler. This just avoids
669 * wasting time for our lazy fixup of such faults. PSL_NT
670 * does nothing in vm86 mode, but vm86 programs can set it
671 * almost legitimately in probes for old cpu types.
673 tf->tf_eflags &= ~(PSL_VM | PSL_NT | PSL_VIF | PSL_VIP);
677 * Copy the sigframe out to the user's stack.
679 if (copyout(&sf, sfp, sizeof(struct sigframe)) != 0) {
681 * Something is wrong with the stack pointer.
682 * ...Kill the process.
687 regs->tf_esp = (int)sfp;
688 regs->tf_eip = PS_STRINGS - *(p->p_sysent->sv_szsigcode);
689 regs->tf_eflags &= ~PSL_T;
690 regs->tf_cs = _ucodesel;
691 regs->tf_ds = _udatasel;
692 regs->tf_es = _udatasel;
693 regs->tf_fs = _udatasel;
695 regs->tf_ss = _udatasel;
699 * osigreturn_args(struct osigcontext *sigcntxp)
701 * System call to cleanup state after a signal
702 * has been taken. Reset signal mask and
703 * stack state from context left by sendsig (above).
704 * Return to previous pc and psl as specified by
705 * context left by sendsig. Check carefully to
706 * make sure that the user has not modified the
707 * state to gain improper privileges.
709 #define EFL_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0)
710 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL)
713 osigreturn(struct osigreturn_args *uap)
715 struct proc *p = curproc;
716 struct osigcontext *scp;
717 struct trapframe *regs = p->p_md.md_regs;
722 if (!useracc((caddr_t)scp, sizeof (struct osigcontext), VM_PROT_READ))
726 if (eflags & PSL_VM) {
727 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs;
728 struct vm86_kernel *vm86;
731 * if pcb_ext == 0 or vm86_inited == 0, the user hasn't
732 * set up the vm86 area, and we can't enter vm86 mode.
734 if (p->p_thread->td_pcb->pcb_ext == 0)
736 vm86 = &p->p_thread->td_pcb->pcb_ext->ext_vm86;
737 if (vm86->vm86_inited == 0)
740 /* go back to user mode if both flags are set */
741 if ((eflags & PSL_VIP) && (eflags & PSL_VIF))
742 trapsignal(p, SIGBUS, 0);
744 if (vm86->vm86_has_vme) {
745 eflags = (tf->tf_eflags & ~VME_USERCHANGE) |
746 (eflags & VME_USERCHANGE) | PSL_VM;
748 vm86->vm86_eflags = eflags; /* save VIF, VIP */
749 eflags = (tf->tf_eflags & ~VM_USERCHANGE) | (eflags & VM_USERCHANGE) | PSL_VM;
751 tf->tf_vm86_ds = scp->sc_ds;
752 tf->tf_vm86_es = scp->sc_es;
753 tf->tf_vm86_fs = scp->sc_fs;
754 tf->tf_vm86_gs = scp->sc_gs;
755 tf->tf_ds = _udatasel;
756 tf->tf_es = _udatasel;
757 tf->tf_fs = _udatasel;
760 * Don't allow users to change privileged or reserved flags.
763 * XXX do allow users to change the privileged flag PSL_RF.
764 * The cpu sets PSL_RF in tf_eflags for faults. Debuggers
765 * should sometimes set it there too. tf_eflags is kept in
766 * the signal context during signal handling and there is no
767 * other place to remember it, so the PSL_RF bit may be
768 * corrupted by the signal handler without us knowing.
769 * Corruption of the PSL_RF bit at worst causes one more or
770 * one less debugger trap, so allowing it is fairly harmless.
772 if (!EFL_SECURE(eflags & ~PSL_RF, regs->tf_eflags & ~PSL_RF)) {
777 * Don't allow users to load a valid privileged %cs. Let the
778 * hardware check for invalid selectors, excess privilege in
779 * other selectors, invalid %eip's and invalid %esp's.
781 if (!CS_SECURE(scp->sc_cs)) {
782 trapsignal(p, SIGBUS, T_PROTFLT);
785 regs->tf_ds = scp->sc_ds;
786 regs->tf_es = scp->sc_es;
787 regs->tf_fs = scp->sc_fs;
790 /* restore scratch registers */
791 regs->tf_eax = scp->sc_eax;
792 regs->tf_ebx = scp->sc_ebx;
793 regs->tf_ecx = scp->sc_ecx;
794 regs->tf_edx = scp->sc_edx;
795 regs->tf_esi = scp->sc_esi;
796 regs->tf_edi = scp->sc_edi;
797 regs->tf_cs = scp->sc_cs;
798 regs->tf_ss = scp->sc_ss;
799 regs->tf_isp = scp->sc_isp;
801 if (scp->sc_onstack & 01)
802 p->p_sigstk.ss_flags |= SS_ONSTACK;
804 p->p_sigstk.ss_flags &= ~SS_ONSTACK;
806 SIGSETOLD(p->p_sigmask, scp->sc_mask);
807 SIG_CANTMASK(p->p_sigmask);
808 regs->tf_ebp = scp->sc_fp;
809 regs->tf_esp = scp->sc_sp;
810 regs->tf_eip = scp->sc_pc;
811 regs->tf_eflags = eflags;
816 * sigreturn(ucontext_t *sigcntxp)
819 sigreturn(struct sigreturn_args *uap)
821 struct proc *p = curproc;
822 struct trapframe *regs;
828 if (!useracc((caddr_t)ucp, sizeof(struct osigcontext), VM_PROT_READ))
830 if (((struct osigcontext *)ucp)->sc_trapno == 0x01d516)
831 return (osigreturn((struct osigreturn_args *)uap));
834 * Since ucp is not an osigcontext but a ucontext_t, we have to
835 * check again if all of it is accessible. A ucontext_t is
836 * much larger, so instead of just checking for the pointer
837 * being valid for the size of an osigcontext, now check for
838 * it being valid for a whole, new-style ucontext_t.
840 if (!useracc((caddr_t)ucp, sizeof(ucontext_t), VM_PROT_READ))
843 regs = p->p_md.md_regs;
844 eflags = ucp->uc_mcontext.mc_eflags;
846 if (eflags & PSL_VM) {
847 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs;
848 struct vm86_kernel *vm86;
851 * if pcb_ext == 0 or vm86_inited == 0, the user hasn't
852 * set up the vm86 area, and we can't enter vm86 mode.
854 if (p->p_thread->td_pcb->pcb_ext == 0)
856 vm86 = &p->p_thread->td_pcb->pcb_ext->ext_vm86;
857 if (vm86->vm86_inited == 0)
860 /* go back to user mode if both flags are set */
861 if ((eflags & PSL_VIP) && (eflags & PSL_VIF))
862 trapsignal(p, SIGBUS, 0);
864 if (vm86->vm86_has_vme) {
865 eflags = (tf->tf_eflags & ~VME_USERCHANGE) |
866 (eflags & VME_USERCHANGE) | PSL_VM;
868 vm86->vm86_eflags = eflags; /* save VIF, VIP */
869 eflags = (tf->tf_eflags & ~VM_USERCHANGE) | (eflags & VM_USERCHANGE) | PSL_VM;
871 bcopy(&ucp->uc_mcontext.mc_fs, tf, sizeof(struct trapframe));
872 tf->tf_eflags = eflags;
873 tf->tf_vm86_ds = tf->tf_ds;
874 tf->tf_vm86_es = tf->tf_es;
875 tf->tf_vm86_fs = tf->tf_fs;
876 tf->tf_vm86_gs = ucp->uc_mcontext.mc_gs;
877 tf->tf_ds = _udatasel;
878 tf->tf_es = _udatasel;
879 tf->tf_fs = _udatasel;
882 * Don't allow users to change privileged or reserved flags.
885 * XXX do allow users to change the privileged flag PSL_RF.
886 * The cpu sets PSL_RF in tf_eflags for faults. Debuggers
887 * should sometimes set it there too. tf_eflags is kept in
888 * the signal context during signal handling and there is no
889 * other place to remember it, so the PSL_RF bit may be
890 * corrupted by the signal handler without us knowing.
891 * Corruption of the PSL_RF bit at worst causes one more or
892 * one less debugger trap, so allowing it is fairly harmless.
894 if (!EFL_SECURE(eflags & ~PSL_RF, regs->tf_eflags & ~PSL_RF)) {
895 printf("sigreturn: eflags = 0x%x\n", eflags);
900 * Don't allow users to load a valid privileged %cs. Let the
901 * hardware check for invalid selectors, excess privilege in
902 * other selectors, invalid %eip's and invalid %esp's.
904 cs = ucp->uc_mcontext.mc_cs;
905 if (!CS_SECURE(cs)) {
906 printf("sigreturn: cs = 0x%x\n", cs);
907 trapsignal(p, SIGBUS, T_PROTFLT);
910 bcopy(&ucp->uc_mcontext.mc_fs, regs, sizeof(struct trapframe));
913 if (ucp->uc_mcontext.mc_onstack & 1)
914 p->p_sigstk.ss_flags |= SS_ONSTACK;
916 p->p_sigstk.ss_flags &= ~SS_ONSTACK;
918 p->p_sigmask = ucp->uc_sigmask;
919 SIG_CANTMASK(p->p_sigmask);
924 * Machine dependent boot() routine
926 * I haven't seen anything to put here yet
927 * Possibly some stuff might be grafted back here from boot()
935 * Shutdown the CPU as much as possible
945 * cpu_idle() represents the idle LWKT. You cannot return from this function
946 * (unless you want to blow things up!). Instead we look for runnable threads
947 * and loop or halt as appropriate. Giant is not held on entry to the thread.
949 * The main loop is entered with a critical section held, we must release
950 * the critical section before doing anything else. lwkt_switch() will
951 * check for pending interrupts due to entering and exiting its own
954 * Note on cpu_idle_hlt: On an SMP system we rely on a scheduler IPI
955 * to wake a HLTed cpu up. However, there are cases where the idlethread
956 * will be entered with the possibility that no IPI will occur and in such
957 * cases lwkt_switch() sets TDF_IDLE_NOHLT.
959 static int cpu_idle_hlt = 1;
960 SYSCTL_INT(_machdep, OID_AUTO, cpu_idle_hlt, CTLFLAG_RW,
961 &cpu_idle_hlt, 0, "Idle loop HLT enable");
966 struct thread *td = curthread;
969 KKASSERT(td->td_pri < TDPRI_CRIT);
972 * See if there are any LWKTs ready to go.
977 * If we are going to halt call splz unconditionally after
978 * CLIing to catch any interrupt races. Note that we are
979 * at SPL0 and interrupts are enabled.
981 if (cpu_idle_hlt && !lwkt_runnable() &&
982 (td->td_flags & TDF_IDLE_NOHLT) == 0) {
984 * We must guarentee that hlt is exactly the instruction
987 __asm __volatile("cli");
989 __asm __volatile("sti; hlt");
991 td->td_flags &= ~TDF_IDLE_NOHLT;
992 __asm __volatile("sti");
998 * Clear registers on exec
1001 setregs(p, entry, stack, ps_strings)
1007 struct trapframe *regs = p->p_md.md_regs;
1008 struct pcb *pcb = p->p_thread->td_pcb;
1010 /* Reset pc->pcb_gs and %gs before possibly invalidating it. */
1011 pcb->pcb_gs = _udatasel;
1015 /* was i386_user_cleanup() in NetBSD */
1019 bzero((char *)regs, sizeof(struct trapframe));
1020 regs->tf_eip = entry;
1021 regs->tf_esp = stack;
1022 regs->tf_eflags = PSL_USER | (regs->tf_eflags & PSL_T);
1023 regs->tf_ss = _udatasel;
1024 regs->tf_ds = _udatasel;
1025 regs->tf_es = _udatasel;
1026 regs->tf_fs = _udatasel;
1027 regs->tf_cs = _ucodesel;
1029 /* PS_STRINGS value for BSD/OS binaries. It is 0 for non-BSD/OS. */
1030 regs->tf_ebx = ps_strings;
1033 * Reset the hardware debug registers if they were in use.
1034 * They won't have any meaning for the newly exec'd process.
1036 if (pcb->pcb_flags & PCB_DBREGS) {
1043 if (pcb == curthread->td_pcb) {
1045 * Clear the debug registers on the running
1046 * CPU, otherwise they will end up affecting
1047 * the next process we switch to.
1051 pcb->pcb_flags &= ~PCB_DBREGS;
1055 * Initialize the math emulator (if any) for the current process.
1056 * Actually, just clear the bit that says that the emulator has
1057 * been initialized. Initialization is delayed until the process
1058 * traps to the emulator (if it is done at all) mainly because
1059 * emulators don't provide an entry point for initialization.
1061 p->p_thread->td_pcb->pcb_flags &= ~FP_SOFTFP;
1064 * Arrange to trap the next npx or `fwait' instruction (see npx.c
1065 * for why fwait must be trapped at least if there is an npx or an
1066 * emulator). This is mainly to handle the case where npx0 is not
1067 * configured, since the npx routines normally set up the trap
1068 * otherwise. It should be done only at boot time, but doing it
1069 * here allows modifying `npx_exists' for testing the emulator on
1070 * systems with an npx.
1072 load_cr0(rcr0() | CR0_MP | CR0_TS);
1075 /* Initialize the npx (if any) for the current process. */
1076 npxinit(__INITIAL_NPXCW__);
1080 * note: linux emulator needs edx to be 0x0 on entry, which is
1081 * handled in execve simply by leaving the return value(s) 0.
1091 cr0 |= CR0_NE; /* Done by npxinit() */
1092 cr0 |= CR0_MP | CR0_TS; /* Done at every execve() too. */
1094 if (cpu_class != CPUCLASS_386)
1096 cr0 |= CR0_WP | CR0_AM;
1102 sysctl_machdep_adjkerntz(SYSCTL_HANDLER_ARGS)
1105 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2,
1107 if (!error && req->newptr)
1112 SYSCTL_PROC(_machdep, CPU_ADJKERNTZ, adjkerntz, CTLTYPE_INT|CTLFLAG_RW,
1113 &adjkerntz, 0, sysctl_machdep_adjkerntz, "I", "");
1115 SYSCTL_INT(_machdep, CPU_DISRTCSET, disable_rtc_set,
1116 CTLFLAG_RW, &disable_rtc_set, 0, "");
1118 SYSCTL_STRUCT(_machdep, CPU_BOOTINFO, bootinfo,
1119 CTLFLAG_RD, &bootinfo, bootinfo, "");
1121 SYSCTL_INT(_machdep, CPU_WALLCLOCK, wall_cmos_clock,
1122 CTLFLAG_RW, &wall_cmos_clock, 0, "");
1124 extern u_long bootdev; /* not a dev_t - encoding is different */
1125 SYSCTL_ULONG(_machdep, OID_AUTO, guessed_bootdev,
1126 CTLFLAG_RD, &bootdev, 0, "Boot device (not in dev_t format)");
1129 * Initialize 386 and configure to run kernel
1133 * Initialize segments & interrupt table
1137 union descriptor gdt[NGDT * MAXCPU]; /* global descriptor table */
1138 static struct gate_descriptor idt0[NIDT];
1139 struct gate_descriptor *idt = &idt0[0]; /* interrupt descriptor table */
1140 union descriptor ldt[NLDT]; /* local descriptor table */
1142 /* table descriptors - used to load tables by cpu */
1143 struct region_descriptor r_gdt, r_idt;
1145 #if defined(I586_CPU) && !defined(NO_F00F_HACK)
1146 extern int has_f00f_bug;
1149 static struct i386tss dblfault_tss;
1150 static char dblfault_stack[PAGE_SIZE];
1152 extern struct user *proc0paddr;
1155 /* software prototypes -- in more palatable form */
1156 struct soft_segment_descriptor gdt_segs[] = {
1157 /* GNULL_SEL 0 Null Descriptor */
1158 { 0x0, /* segment base address */
1160 0, /* segment type */
1161 0, /* segment descriptor priority level */
1162 0, /* segment descriptor present */
1164 0, /* default 32 vs 16 bit size */
1165 0 /* limit granularity (byte/page units)*/ },
1166 /* GCODE_SEL 1 Code Descriptor for kernel */
1167 { 0x0, /* segment base address */
1168 0xfffff, /* length - all address space */
1169 SDT_MEMERA, /* segment type */
1170 0, /* segment descriptor priority level */
1171 1, /* segment descriptor present */
1173 1, /* default 32 vs 16 bit size */
1174 1 /* limit granularity (byte/page units)*/ },
1175 /* GDATA_SEL 2 Data Descriptor for kernel */
1176 { 0x0, /* segment base address */
1177 0xfffff, /* length - all address space */
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 /* GPRIV_SEL 3 SMP Per-Processor Private Data Descriptor */
1185 { 0x0, /* segment base address */
1186 0xfffff, /* length - all address space */
1187 SDT_MEMRWA, /* segment type */
1188 0, /* segment descriptor priority level */
1189 1, /* segment descriptor present */
1191 1, /* default 32 vs 16 bit size */
1192 1 /* limit granularity (byte/page units)*/ },
1193 /* GPROC0_SEL 4 Proc 0 Tss Descriptor */
1195 0x0, /* segment base address */
1196 sizeof(struct i386tss)-1,/* length - all address space */
1197 SDT_SYS386TSS, /* segment type */
1198 0, /* segment descriptor priority level */
1199 1, /* segment descriptor present */
1201 0, /* unused - default 32 vs 16 bit size */
1202 0 /* limit granularity (byte/page units)*/ },
1203 /* GLDT_SEL 5 LDT Descriptor */
1204 { (int) ldt, /* segment base address */
1205 sizeof(ldt)-1, /* length - all address space */
1206 SDT_SYSLDT, /* segment type */
1207 SEL_UPL, /* segment descriptor priority level */
1208 1, /* segment descriptor present */
1210 0, /* unused - default 32 vs 16 bit size */
1211 0 /* limit granularity (byte/page units)*/ },
1212 /* GUSERLDT_SEL 6 User LDT Descriptor per process */
1213 { (int) ldt, /* segment base address */
1214 (512 * sizeof(union descriptor)-1), /* length */
1215 SDT_SYSLDT, /* segment type */
1216 0, /* segment descriptor priority level */
1217 1, /* segment descriptor present */
1219 0, /* unused - default 32 vs 16 bit size */
1220 0 /* limit granularity (byte/page units)*/ },
1221 /* GTGATE_SEL 7 Null Descriptor - Placeholder */
1222 { 0x0, /* segment base address */
1223 0x0, /* length - all address space */
1224 0, /* segment type */
1225 0, /* segment descriptor priority level */
1226 0, /* segment descriptor present */
1228 0, /* default 32 vs 16 bit size */
1229 0 /* limit granularity (byte/page units)*/ },
1230 /* GBIOSLOWMEM_SEL 8 BIOS access to realmode segment 0x40, must be #8 in GDT */
1231 { 0x400, /* segment base address */
1232 0xfffff, /* length */
1233 SDT_MEMRWA, /* segment type */
1234 0, /* segment descriptor priority level */
1235 1, /* segment descriptor present */
1237 1, /* default 32 vs 16 bit size */
1238 1 /* limit granularity (byte/page units)*/ },
1239 /* GPANIC_SEL 9 Panic Tss Descriptor */
1240 { (int) &dblfault_tss, /* segment base address */
1241 sizeof(struct i386tss)-1,/* length - all address space */
1242 SDT_SYS386TSS, /* segment type */
1243 0, /* segment descriptor priority level */
1244 1, /* segment descriptor present */
1246 0, /* unused - default 32 vs 16 bit size */
1247 0 /* limit granularity (byte/page units)*/ },
1248 /* GBIOSCODE32_SEL 10 BIOS 32-bit interface (32bit Code) */
1249 { 0, /* segment base address (overwritten) */
1250 0xfffff, /* length */
1251 SDT_MEMERA, /* segment type */
1252 0, /* segment descriptor priority level */
1253 1, /* segment descriptor present */
1255 0, /* default 32 vs 16 bit size */
1256 1 /* limit granularity (byte/page units)*/ },
1257 /* GBIOSCODE16_SEL 11 BIOS 32-bit interface (16bit Code) */
1258 { 0, /* segment base address (overwritten) */
1259 0xfffff, /* length */
1260 SDT_MEMERA, /* segment type */
1261 0, /* segment descriptor priority level */
1262 1, /* segment descriptor present */
1264 0, /* default 32 vs 16 bit size */
1265 1 /* limit granularity (byte/page units)*/ },
1266 /* GBIOSDATA_SEL 12 BIOS 32-bit interface (Data) */
1267 { 0, /* segment base address (overwritten) */
1268 0xfffff, /* length */
1269 SDT_MEMRWA, /* segment type */
1270 0, /* segment descriptor priority level */
1271 1, /* segment descriptor present */
1273 1, /* default 32 vs 16 bit size */
1274 1 /* limit granularity (byte/page units)*/ },
1275 /* GBIOSUTIL_SEL 13 BIOS 16-bit interface (Utility) */
1276 { 0, /* segment base address (overwritten) */
1277 0xfffff, /* length */
1278 SDT_MEMRWA, /* segment type */
1279 0, /* segment descriptor priority level */
1280 1, /* segment descriptor present */
1282 0, /* default 32 vs 16 bit size */
1283 1 /* limit granularity (byte/page units)*/ },
1284 /* GBIOSARGS_SEL 14 BIOS 16-bit interface (Arguments) */
1285 { 0, /* segment base address (overwritten) */
1286 0xfffff, /* length */
1287 SDT_MEMRWA, /* segment type */
1288 0, /* segment descriptor priority level */
1289 1, /* segment descriptor present */
1291 0, /* default 32 vs 16 bit size */
1292 1 /* limit granularity (byte/page units)*/ },
1295 static struct soft_segment_descriptor ldt_segs[] = {
1296 /* Null Descriptor - overwritten by call gate */
1297 { 0x0, /* segment base address */
1298 0x0, /* length - all address space */
1299 0, /* segment type */
1300 0, /* segment descriptor priority level */
1301 0, /* segment descriptor present */
1303 0, /* default 32 vs 16 bit size */
1304 0 /* limit granularity (byte/page units)*/ },
1305 /* Null Descriptor - overwritten by call gate */
1306 { 0x0, /* segment base address */
1307 0x0, /* length - all address space */
1308 0, /* segment type */
1309 0, /* segment descriptor priority level */
1310 0, /* segment descriptor present */
1312 0, /* default 32 vs 16 bit size */
1313 0 /* limit granularity (byte/page units)*/ },
1314 /* Null Descriptor - overwritten by call gate */
1315 { 0x0, /* segment base address */
1316 0x0, /* length - all address space */
1317 0, /* segment type */
1318 0, /* segment descriptor priority level */
1319 0, /* segment descriptor present */
1321 0, /* default 32 vs 16 bit size */
1322 0 /* limit granularity (byte/page units)*/ },
1323 /* Code Descriptor for user */
1324 { 0x0, /* segment base address */
1325 0xfffff, /* length - all address space */
1326 SDT_MEMERA, /* segment type */
1327 SEL_UPL, /* segment descriptor priority level */
1328 1, /* segment descriptor present */
1330 1, /* default 32 vs 16 bit size */
1331 1 /* limit granularity (byte/page units)*/ },
1332 /* Null Descriptor - overwritten by call gate */
1333 { 0x0, /* segment base address */
1334 0x0, /* length - all address space */
1335 0, /* segment type */
1336 0, /* segment descriptor priority level */
1337 0, /* segment descriptor present */
1339 0, /* default 32 vs 16 bit size */
1340 0 /* limit granularity (byte/page units)*/ },
1341 /* Data Descriptor for user */
1342 { 0x0, /* segment base address */
1343 0xfffff, /* length - all address space */
1344 SDT_MEMRWA, /* segment type */
1345 SEL_UPL, /* segment descriptor priority level */
1346 1, /* segment descriptor present */
1348 1, /* default 32 vs 16 bit size */
1349 1 /* limit granularity (byte/page units)*/ },
1353 setidt(idx, func, typ, dpl, selec)
1360 struct gate_descriptor *ip;
1363 ip->gd_looffset = (int)func;
1364 ip->gd_selector = selec;
1370 ip->gd_hioffset = ((int)func)>>16 ;
1373 #define IDTVEC(name) __CONCAT(X,name)
1376 IDTVEC(div), IDTVEC(dbg), IDTVEC(nmi), IDTVEC(bpt), IDTVEC(ofl),
1377 IDTVEC(bnd), IDTVEC(ill), IDTVEC(dna), IDTVEC(fpusegm),
1378 IDTVEC(tss), IDTVEC(missing), IDTVEC(stk), IDTVEC(prot),
1379 IDTVEC(page), IDTVEC(mchk), IDTVEC(rsvd), IDTVEC(fpu), IDTVEC(align),
1380 IDTVEC(xmm), IDTVEC(syscall);
1382 IDTVEC(int0x80_syscall), IDTVEC(int0x81_syscall);
1386 struct segment_descriptor *sd;
1387 struct soft_segment_descriptor *ssd;
1389 ssd->ssd_base = (sd->sd_hibase << 24) | sd->sd_lobase;
1390 ssd->ssd_limit = (sd->sd_hilimit << 16) | sd->sd_lolimit;
1391 ssd->ssd_type = sd->sd_type;
1392 ssd->ssd_dpl = sd->sd_dpl;
1393 ssd->ssd_p = sd->sd_p;
1394 ssd->ssd_def32 = sd->sd_def32;
1395 ssd->ssd_gran = sd->sd_gran;
1398 #define PHYSMAP_SIZE (2 * 8)
1401 * Populate the (physmap) array with base/bound pairs describing the
1402 * available physical memory in the system, then test this memory and
1403 * build the phys_avail array describing the actually-available memory.
1405 * If we cannot accurately determine the physical memory map, then use
1406 * value from the 0xE801 call, and failing that, the RTC.
1408 * Total memory size may be set by the kernel environment variable
1409 * hw.physmem or the compile-time define MAXMEM.
1412 getmemsize(int first)
1414 int i, physmap_idx, pa_indx;
1416 u_int basemem, extmem;
1417 struct vm86frame vmf;
1418 struct vm86context vmc;
1419 vm_offset_t pa, physmap[PHYSMAP_SIZE];
1429 TUNABLE_INT_FETCH("hw.hasbrokenint12", &hasbrokenint12);
1430 bzero(&vmf, sizeof(struct vm86frame));
1431 bzero(physmap, sizeof(physmap));
1435 * Some newer BIOSes has broken INT 12H implementation which cause
1436 * kernel panic immediately. In this case, we need to scan SMAP
1437 * with INT 15:E820 first, then determine base memory size.
1439 if (hasbrokenint12) {
1444 * Perform "base memory" related probes & setup
1446 vm86_intcall(0x12, &vmf);
1447 basemem = vmf.vmf_ax;
1448 if (basemem > 640) {
1449 printf("Preposterous BIOS basemem of %uK, truncating to 640K\n",
1455 * XXX if biosbasemem is now < 640, there is a `hole'
1456 * between the end of base memory and the start of
1457 * ISA memory. The hole may be empty or it may
1458 * contain BIOS code or data. Map it read/write so
1459 * that the BIOS can write to it. (Memory from 0 to
1460 * the physical end of the kernel is mapped read-only
1461 * to begin with and then parts of it are remapped.
1462 * The parts that aren't remapped form holes that
1463 * remain read-only and are unused by the kernel.
1464 * The base memory area is below the physical end of
1465 * the kernel and right now forms a read-only hole.
1466 * The part of it from PAGE_SIZE to
1467 * (trunc_page(biosbasemem * 1024) - 1) will be
1468 * remapped and used by the kernel later.)
1470 * This code is similar to the code used in
1471 * pmap_mapdev, but since no memory needs to be
1472 * allocated we simply change the mapping.
1474 for (pa = trunc_page(basemem * 1024);
1475 pa < ISA_HOLE_START; pa += PAGE_SIZE) {
1476 pte = (pt_entry_t)vtopte(pa + KERNBASE);
1477 *pte = pa | PG_RW | PG_V;
1481 * if basemem != 640, map pages r/w into vm86 page table so
1482 * that the bios can scribble on it.
1484 pte = (pt_entry_t)vm86paddr;
1485 for (i = basemem / 4; i < 160; i++)
1486 pte[i] = (i << PAGE_SHIFT) | PG_V | PG_RW | PG_U;
1490 * map page 1 R/W into the kernel page table so we can use it
1491 * as a buffer. The kernel will unmap this page later.
1493 pte = (pt_entry_t)vtopte(KERNBASE + (1 << PAGE_SHIFT));
1494 *pte = (1 << PAGE_SHIFT) | PG_RW | PG_V;
1497 * get memory map with INT 15:E820
1499 #define SMAPSIZ sizeof(*smap)
1500 #define SMAP_SIG 0x534D4150 /* 'SMAP' */
1503 smap = (void *)vm86_addpage(&vmc, 1, KERNBASE + (1 << PAGE_SHIFT));
1504 vm86_getptr(&vmc, (vm_offset_t)smap, &vmf.vmf_es, &vmf.vmf_di);
1509 vmf.vmf_eax = 0xE820;
1510 vmf.vmf_edx = SMAP_SIG;
1511 vmf.vmf_ecx = SMAPSIZ;
1512 i = vm86_datacall(0x15, &vmf, &vmc);
1513 if (i || vmf.vmf_eax != SMAP_SIG)
1515 if (boothowto & RB_VERBOSE)
1516 printf("SMAP type=%02x base=%08x %08x len=%08x %08x\n",
1518 *(u_int32_t *)((char *)&smap->base + 4),
1519 (u_int32_t)smap->base,
1520 *(u_int32_t *)((char *)&smap->length + 4),
1521 (u_int32_t)smap->length);
1523 if (smap->type != 0x01)
1526 if (smap->length == 0)
1529 if (smap->base >= 0xffffffff) {
1530 printf("%uK of memory above 4GB ignored\n",
1531 (u_int)(smap->length / 1024));
1535 for (i = 0; i <= physmap_idx; i += 2) {
1536 if (smap->base < physmap[i + 1]) {
1537 if (boothowto & RB_VERBOSE)
1539 "Overlapping or non-montonic memory region, ignoring second region\n");
1544 if (smap->base == physmap[physmap_idx + 1]) {
1545 physmap[physmap_idx + 1] += smap->length;
1550 if (physmap_idx == PHYSMAP_SIZE) {
1552 "Too many segments in the physical address map, giving up\n");
1555 physmap[physmap_idx] = smap->base;
1556 physmap[physmap_idx + 1] = smap->base + smap->length;
1558 } while (vmf.vmf_ebx != 0);
1561 * Perform "base memory" related probes & setup based on SMAP
1564 for (i = 0; i <= physmap_idx; i += 2) {
1565 if (physmap[i] == 0x00000000) {
1566 basemem = physmap[i + 1] / 1024;
1575 if (basemem > 640) {
1576 printf("Preposterous BIOS basemem of %uK, truncating to 640K\n",
1581 for (pa = trunc_page(basemem * 1024);
1582 pa < ISA_HOLE_START; pa += PAGE_SIZE) {
1583 pte = (pt_entry_t)vtopte(pa + KERNBASE);
1584 *pte = pa | PG_RW | PG_V;
1587 pte = (pt_entry_t)vm86paddr;
1588 for (i = basemem / 4; i < 160; i++)
1589 pte[i] = (i << PAGE_SHIFT) | PG_V | PG_RW | PG_U;
1592 if (physmap[1] != 0)
1596 * If we failed above, try memory map with INT 15:E801
1598 vmf.vmf_ax = 0xE801;
1599 if (vm86_intcall(0x15, &vmf) == 0) {
1600 extmem = vmf.vmf_cx + vmf.vmf_dx * 64;
1604 vm86_intcall(0x15, &vmf);
1605 extmem = vmf.vmf_ax;
1608 * Prefer the RTC value for extended memory.
1610 extmem = rtcin(RTC_EXTLO) + (rtcin(RTC_EXTHI) << 8);
1615 * Special hack for chipsets that still remap the 384k hole when
1616 * there's 16MB of memory - this really confuses people that
1617 * are trying to use bus mastering ISA controllers with the
1618 * "16MB limit"; they only have 16MB, but the remapping puts
1619 * them beyond the limit.
1621 * If extended memory is between 15-16MB (16-17MB phys address range),
1624 if ((extmem > 15 * 1024) && (extmem < 16 * 1024))
1628 physmap[1] = basemem * 1024;
1630 physmap[physmap_idx] = 0x100000;
1631 physmap[physmap_idx + 1] = physmap[physmap_idx] + extmem * 1024;
1635 * Now, physmap contains a map of physical memory.
1639 /* make hole for AP bootstrap code YYY */
1640 physmap[1] = mp_bootaddress(physmap[1] / 1024);
1642 /* look for the MP hardware - needed for apic addresses */
1647 * Maxmem isn't the "maximum memory", it's one larger than the
1648 * highest page of the physical address space. It should be
1649 * called something like "Maxphyspage". We may adjust this
1650 * based on ``hw.physmem'' and the results of the memory test.
1652 Maxmem = atop(physmap[physmap_idx + 1]);
1655 Maxmem = MAXMEM / 4;
1659 * hw.maxmem is a size in bytes; we also allow k, m, and g suffixes
1660 * for the appropriate modifiers. This overrides MAXMEM.
1662 if ((cp = getenv("hw.physmem")) != NULL) {
1663 u_int64_t AllowMem, sanity;
1666 sanity = AllowMem = strtouq(cp, &ep, 0);
1667 if ((ep != cp) && (*ep != 0)) {
1680 AllowMem = sanity = 0;
1682 if (AllowMem < sanity)
1686 printf("Ignoring invalid memory size of '%s'\n", cp);
1688 Maxmem = atop(AllowMem);
1691 if (atop(physmap[physmap_idx + 1]) != Maxmem &&
1692 (boothowto & RB_VERBOSE))
1693 printf("Physical memory use set to %uK\n", Maxmem * 4);
1696 * If Maxmem has been increased beyond what the system has detected,
1697 * extend the last memory segment to the new limit.
1699 if (atop(physmap[physmap_idx + 1]) < Maxmem)
1700 physmap[physmap_idx + 1] = ptoa(Maxmem);
1702 /* call pmap initialization to make new kernel address space */
1703 pmap_bootstrap(first, 0);
1706 * Size up each available chunk of physical memory.
1708 physmap[0] = PAGE_SIZE; /* mask off page 0 */
1710 phys_avail[pa_indx++] = physmap[0];
1711 phys_avail[pa_indx] = physmap[0];
1713 pte = (pt_entry_t)vtopte(KERNBASE);
1715 pte = (pt_entry_t)CMAP1;
1719 * physmap is in bytes, so when converting to page boundaries,
1720 * round up the start address and round down the end address.
1722 for (i = 0; i <= physmap_idx; i += 2) {
1726 if (physmap[i + 1] < end)
1727 end = trunc_page(physmap[i + 1]);
1728 for (pa = round_page(physmap[i]); pa < end; pa += PAGE_SIZE) {
1733 int *ptr = (int *)CADDR1;
1737 * block out kernel memory as not available.
1739 if (pa >= 0x100000 && pa < first)
1745 * map page into kernel: valid, read/write,non-cacheable
1747 *pte = pa | PG_V | PG_RW | PG_N;
1752 * Test for alternating 1's and 0's
1754 *(volatile int *)ptr = 0xaaaaaaaa;
1755 if (*(volatile int *)ptr != 0xaaaaaaaa) {
1759 * Test for alternating 0's and 1's
1761 *(volatile int *)ptr = 0x55555555;
1762 if (*(volatile int *)ptr != 0x55555555) {
1768 *(volatile int *)ptr = 0xffffffff;
1769 if (*(volatile int *)ptr != 0xffffffff) {
1775 *(volatile int *)ptr = 0x0;
1776 if (*(volatile int *)ptr != 0x0) {
1780 * Restore original value.
1785 * Adjust array of valid/good pages.
1787 if (page_bad == TRUE) {
1791 * If this good page is a continuation of the
1792 * previous set of good pages, then just increase
1793 * the end pointer. Otherwise start a new chunk.
1794 * Note that "end" points one higher than end,
1795 * making the range >= start and < end.
1796 * If we're also doing a speculative memory
1797 * test and we at or past the end, bump up Maxmem
1798 * so that we keep going. The first bad page
1799 * will terminate the loop.
1801 if (phys_avail[pa_indx] == pa) {
1802 phys_avail[pa_indx] += PAGE_SIZE;
1805 if (pa_indx == PHYS_AVAIL_ARRAY_END) {
1806 printf("Too many holes in the physical address space, giving up\n");
1810 phys_avail[pa_indx++] = pa; /* start */
1811 phys_avail[pa_indx] = pa + PAGE_SIZE; /* end */
1821 * The last chunk must contain at least one page plus the message
1822 * buffer to avoid complicating other code (message buffer address
1823 * calculation, etc.).
1825 while (phys_avail[pa_indx - 1] + PAGE_SIZE +
1826 round_page(MSGBUF_SIZE) >= phys_avail[pa_indx]) {
1827 physmem -= atop(phys_avail[pa_indx] - phys_avail[pa_indx - 1]);
1828 phys_avail[pa_indx--] = 0;
1829 phys_avail[pa_indx--] = 0;
1832 Maxmem = atop(phys_avail[pa_indx]);
1834 /* Trim off space for the message buffer. */
1835 phys_avail[pa_indx] -= round_page(MSGBUF_SIZE);
1837 avail_end = phys_avail[pa_indx];
1843 struct gate_descriptor *gdp;
1844 int gsel_tss, metadata_missing, off, x;
1845 struct mdglobaldata *gd;
1848 * Prevent lowering of the ipl if we call tsleep() early.
1850 gd = &CPU_prvspace[0].mdglobaldata;
1851 bzero(gd, sizeof(*gd));
1853 gd->mi.gd_curthread = &thread0;
1855 atdevbase = ISA_HOLE_START + KERNBASE;
1857 metadata_missing = 0;
1858 if (bootinfo.bi_modulep) {
1859 preload_metadata = (caddr_t)bootinfo.bi_modulep + KERNBASE;
1860 preload_bootstrap_relocate(KERNBASE);
1862 metadata_missing = 1;
1864 if (bootinfo.bi_envp)
1865 kern_envp = (caddr_t)bootinfo.bi_envp + KERNBASE;
1867 /* start with one cpu */
1869 /* Init basic tunables, hz etc */
1873 * make gdt memory segments, the code segment goes up to end of the
1874 * page with etext in it, the data segment goes to the end of
1878 * XXX text protection is temporarily (?) disabled. The limit was
1879 * i386_btop(round_page(etext)) - 1.
1881 gdt_segs[GCODE_SEL].ssd_limit = atop(0 - 1);
1882 gdt_segs[GDATA_SEL].ssd_limit = atop(0 - 1);
1884 gdt_segs[GPRIV_SEL].ssd_limit =
1885 atop(sizeof(struct privatespace) - 1);
1886 gdt_segs[GPRIV_SEL].ssd_base = (int) &CPU_prvspace[0];
1887 gdt_segs[GPROC0_SEL].ssd_base =
1888 (int) &CPU_prvspace[0].mdglobaldata.gd_common_tss;
1890 gd->mi.gd_prvspace = &CPU_prvspace[0];
1893 * Note: on both UP and SMP curthread must be set non-NULL
1894 * early in the boot sequence because the system assumes
1895 * that 'curthread' is never NULL.
1898 for (x = 0; x < NGDT; x++) {
1900 /* avoid overwriting db entries with APM ones */
1901 if (x >= GAPMCODE32_SEL && x <= GAPMDATA_SEL)
1904 ssdtosd(&gdt_segs[x], &gdt[x].sd);
1907 r_gdt.rd_limit = NGDT * sizeof(gdt[0]) - 1;
1908 r_gdt.rd_base = (int) gdt;
1911 mi_gdinit(&gd->mi, 0);
1913 lwkt_init_thread(&thread0, proc0paddr, 0, &gd->mi);
1914 lwkt_set_comm(&thread0, "thread0");
1915 proc0.p_addr = (void *)thread0.td_kstack;
1916 proc0.p_thread = &thread0;
1917 proc0.p_flag |= P_CP_RELEASED; /* early set. See also init_main.c */
1918 thread0.td_flags |= TDF_RUNNING;
1919 thread0.td_proc = &proc0;
1920 thread0.td_switch = cpu_heavy_switch; /* YYY eventually LWKT */
1921 safepri = thread0.td_cpl = SWI_MASK | HWI_MASK;
1923 /* make ldt memory segments */
1925 * XXX - VM_MAXUSER_ADDRESS is an end address, not a max. And it
1926 * should be spelled ...MAX_USER...
1928 ldt_segs[LUCODE_SEL].ssd_limit = atop(VM_MAXUSER_ADDRESS - 1);
1929 ldt_segs[LUDATA_SEL].ssd_limit = atop(VM_MAXUSER_ADDRESS - 1);
1930 for (x = 0; x < sizeof ldt_segs / sizeof ldt_segs[0]; x++)
1931 ssdtosd(&ldt_segs[x], &ldt[x].sd);
1933 _default_ldt = GSEL(GLDT_SEL, SEL_KPL);
1936 gd->gd_currentldt = _default_ldt;
1938 /* spinlocks and the BGL */
1942 for (x = 0; x < NIDT; x++)
1943 setidt(x, &IDTVEC(rsvd), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1944 setidt(0, &IDTVEC(div), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1945 setidt(1, &IDTVEC(dbg), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1946 setidt(2, &IDTVEC(nmi), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1947 setidt(3, &IDTVEC(bpt), SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL));
1948 setidt(4, &IDTVEC(ofl), SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL));
1949 setidt(5, &IDTVEC(bnd), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1950 setidt(6, &IDTVEC(ill), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1951 setidt(7, &IDTVEC(dna), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1952 setidt(8, 0, SDT_SYSTASKGT, SEL_KPL, GSEL(GPANIC_SEL, SEL_KPL));
1953 setidt(9, &IDTVEC(fpusegm), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1954 setidt(10, &IDTVEC(tss), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1955 setidt(11, &IDTVEC(missing), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1956 setidt(12, &IDTVEC(stk), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1957 setidt(13, &IDTVEC(prot), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1958 setidt(14, &IDTVEC(page), SDT_SYS386IGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1959 setidt(15, &IDTVEC(rsvd), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1960 setidt(16, &IDTVEC(fpu), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1961 setidt(17, &IDTVEC(align), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1962 setidt(18, &IDTVEC(mchk), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1963 setidt(19, &IDTVEC(xmm), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1964 setidt(0x80, &IDTVEC(int0x80_syscall),
1965 SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL));
1966 setidt(0x81, &IDTVEC(int0x81_syscall),
1967 SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL));
1969 r_idt.rd_limit = sizeof(idt0) - 1;
1970 r_idt.rd_base = (int) idt;
1974 * Initialize the console before we print anything out.
1978 if (metadata_missing)
1979 printf("WARNING: loader(8) metadata is missing!\n");
1988 if (boothowto & RB_KDB)
1989 Debugger("Boot flags requested debugger");
1992 finishidentcpu(); /* Final stage of CPU initialization */
1993 setidt(6, &IDTVEC(ill), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1994 setidt(13, &IDTVEC(prot), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1995 initializecpu(); /* Initialize CPU registers */
1998 * make an initial tss so cpu can get interrupt stack on syscall!
1999 * The 16 bytes is to save room for a VM86 context.
2001 gd->gd_common_tss.tss_esp0 = (int) thread0.td_pcb - 16;
2002 gd->gd_common_tss.tss_ss0 = GSEL(GDATA_SEL, SEL_KPL) ;
2003 gsel_tss = GSEL(GPROC0_SEL, SEL_KPL);
2004 gd->gd_tss_gdt = &gdt[GPROC0_SEL].sd;
2005 gd->gd_common_tssd = *gd->gd_tss_gdt;
2006 gd->gd_common_tss.tss_ioopt = (sizeof gd->gd_common_tss) << 16;
2009 dblfault_tss.tss_esp = dblfault_tss.tss_esp0 = dblfault_tss.tss_esp1 =
2010 dblfault_tss.tss_esp2 = (int) &dblfault_stack[sizeof(dblfault_stack)];
2011 dblfault_tss.tss_ss = dblfault_tss.tss_ss0 = dblfault_tss.tss_ss1 =
2012 dblfault_tss.tss_ss2 = GSEL(GDATA_SEL, SEL_KPL);
2013 dblfault_tss.tss_cr3 = (int)IdlePTD;
2014 dblfault_tss.tss_eip = (int) dblfault_handler;
2015 dblfault_tss.tss_eflags = PSL_KERNEL;
2016 dblfault_tss.tss_ds = dblfault_tss.tss_es =
2017 dblfault_tss.tss_gs = GSEL(GDATA_SEL, SEL_KPL);
2018 dblfault_tss.tss_fs = GSEL(GPRIV_SEL, SEL_KPL);
2019 dblfault_tss.tss_cs = GSEL(GCODE_SEL, SEL_KPL);
2020 dblfault_tss.tss_ldt = GSEL(GLDT_SEL, SEL_KPL);
2024 init_param2(physmem);
2026 /* now running on new page tables, configured,and u/iom is accessible */
2028 /* Map the message buffer. */
2029 for (off = 0; off < round_page(MSGBUF_SIZE); off += PAGE_SIZE)
2030 pmap_kenter((vm_offset_t)msgbufp + off, avail_end + off);
2032 msgbufinit(msgbufp, MSGBUF_SIZE);
2034 /* make a call gate to reenter kernel with */
2035 gdp = &ldt[LSYS5CALLS_SEL].gd;
2037 x = (int) &IDTVEC(syscall);
2038 gdp->gd_looffset = x++;
2039 gdp->gd_selector = GSEL(GCODE_SEL,SEL_KPL);
2041 gdp->gd_type = SDT_SYS386CGT;
2042 gdp->gd_dpl = SEL_UPL;
2044 gdp->gd_hioffset = ((int) &IDTVEC(syscall)) >>16;
2046 /* XXX does this work? */
2047 ldt[LBSDICALLS_SEL] = ldt[LSYS5CALLS_SEL];
2048 ldt[LSOL26CALLS_SEL] = ldt[LSYS5CALLS_SEL];
2050 /* transfer to user mode */
2052 _ucodesel = LSEL(LUCODE_SEL, SEL_UPL);
2053 _udatasel = LSEL(LUDATA_SEL, SEL_UPL);
2055 /* setup proc 0's pcb */
2056 thread0.td_pcb->pcb_flags = 0;
2057 thread0.td_pcb->pcb_cr3 = (int)IdlePTD; /* should already be setup */
2058 thread0.td_pcb->pcb_ext = 0;
2059 proc0.p_md.md_regs = &proc0_tf;
2063 * Initialize machine-dependant portions of the global data structure.
2064 * Note that the global data area and cpu0's idlestack in the private
2065 * data space were allocated in locore.
2067 * Note: the idlethread's cpl is 0
2069 * WARNING! Called from early boot, 'mycpu' may not work yet.
2072 cpu_gdinit(struct mdglobaldata *gd, int cpu)
2077 gd->mi.gd_curthread = &gd->mi.gd_idlethread;
2079 sp = gd->mi.gd_prvspace->idlestack;
2080 lwkt_init_thread(&gd->mi.gd_idlethread, sp, 0, &gd->mi);
2081 lwkt_set_comm(&gd->mi.gd_idlethread, "idle_%d", cpu);
2082 gd->mi.gd_idlethread.td_switch = cpu_lwkt_switch;
2083 gd->mi.gd_idlethread.td_sp -= sizeof(void *);
2084 *(void **)gd->mi.gd_idlethread.td_sp = cpu_idle_restore;
2088 globaldata_find(int cpu)
2090 KKASSERT(cpu >= 0 && cpu < ncpus);
2091 return(&CPU_prvspace[cpu].mdglobaldata.mi);
2094 #if defined(I586_CPU) && !defined(NO_F00F_HACK)
2095 static void f00f_hack(void *unused);
2096 SYSINIT(f00f_hack, SI_SUB_INTRINSIC, SI_ORDER_FIRST, f00f_hack, NULL);
2099 f00f_hack(void *unused)
2101 struct gate_descriptor *new_idt;
2107 printf("Intel Pentium detected, installing workaround for F00F bug\n");
2109 r_idt.rd_limit = sizeof(idt0) - 1;
2111 tmp = kmem_alloc(kernel_map, PAGE_SIZE * 2);
2113 panic("kmem_alloc returned 0");
2114 if (((unsigned int)tmp & (PAGE_SIZE-1)) != 0)
2115 panic("kmem_alloc returned non-page-aligned memory");
2116 /* Put the first seven entries in the lower page */
2117 new_idt = (struct gate_descriptor*)(tmp + PAGE_SIZE - (7*8));
2118 bcopy(idt, new_idt, sizeof(idt0));
2119 r_idt.rd_base = (int)new_idt;
2122 if (vm_map_protect(kernel_map, tmp, tmp + PAGE_SIZE,
2123 VM_PROT_READ, FALSE) != KERN_SUCCESS)
2124 panic("vm_map_protect failed");
2127 #endif /* defined(I586_CPU) && !NO_F00F_HACK */
2130 ptrace_set_pc(p, addr)
2134 p->p_md.md_regs->tf_eip = addr;
2139 ptrace_single_step(p)
2142 p->p_md.md_regs->tf_eflags |= PSL_T;
2146 int ptrace_read_u_check(p, addr, len)
2153 if ((vm_offset_t) (addr + len) < addr)
2155 if ((vm_offset_t) (addr + len) <= sizeof(struct user))
2158 gap = (char *) p->p_md.md_regs - (char *) p->p_addr;
2160 if ((vm_offset_t) addr < gap)
2162 if ((vm_offset_t) (addr + len) <=
2163 (vm_offset_t) (gap + sizeof(struct trapframe)))
2168 int ptrace_write_u(p, off, data)
2173 struct trapframe frame_copy;
2175 struct trapframe *tp;
2178 * Privileged kernel state is scattered all over the user area.
2179 * Only allow write access to parts of regs and to fpregs.
2181 min = (char *)p->p_md.md_regs - (char *)p->p_addr;
2182 if (off >= min && off <= min + sizeof(struct trapframe) - sizeof(int)) {
2183 tp = p->p_md.md_regs;
2185 *(int *)((char *)&frame_copy + (off - min)) = data;
2186 if (!EFL_SECURE(frame_copy.tf_eflags, tp->tf_eflags) ||
2187 !CS_SECURE(frame_copy.tf_cs))
2189 *(int*)((char *)p->p_addr + off) = data;
2194 * The PCB is at the end of the user area YYY
2196 min = (char *)p->p_thread->td_pcb - (char *)p->p_addr;
2197 min += offsetof(struct pcb, pcb_save);
2198 if (off >= min && off <= min + sizeof(union savefpu) - sizeof(int)) {
2199 *(int*)((char *)p->p_addr + off) = data;
2211 struct trapframe *tp;
2213 tp = p->p_md.md_regs;
2214 regs->r_fs = tp->tf_fs;
2215 regs->r_es = tp->tf_es;
2216 regs->r_ds = tp->tf_ds;
2217 regs->r_edi = tp->tf_edi;
2218 regs->r_esi = tp->tf_esi;
2219 regs->r_ebp = tp->tf_ebp;
2220 regs->r_ebx = tp->tf_ebx;
2221 regs->r_edx = tp->tf_edx;
2222 regs->r_ecx = tp->tf_ecx;
2223 regs->r_eax = tp->tf_eax;
2224 regs->r_eip = tp->tf_eip;
2225 regs->r_cs = tp->tf_cs;
2226 regs->r_eflags = tp->tf_eflags;
2227 regs->r_esp = tp->tf_esp;
2228 regs->r_ss = tp->tf_ss;
2229 pcb = p->p_thread->td_pcb;
2230 regs->r_gs = pcb->pcb_gs;
2240 struct trapframe *tp;
2242 tp = p->p_md.md_regs;
2243 if (!EFL_SECURE(regs->r_eflags, tp->tf_eflags) ||
2244 !CS_SECURE(regs->r_cs))
2246 tp->tf_fs = regs->r_fs;
2247 tp->tf_es = regs->r_es;
2248 tp->tf_ds = regs->r_ds;
2249 tp->tf_edi = regs->r_edi;
2250 tp->tf_esi = regs->r_esi;
2251 tp->tf_ebp = regs->r_ebp;
2252 tp->tf_ebx = regs->r_ebx;
2253 tp->tf_edx = regs->r_edx;
2254 tp->tf_ecx = regs->r_ecx;
2255 tp->tf_eax = regs->r_eax;
2256 tp->tf_eip = regs->r_eip;
2257 tp->tf_cs = regs->r_cs;
2258 tp->tf_eflags = regs->r_eflags;
2259 tp->tf_esp = regs->r_esp;
2260 tp->tf_ss = regs->r_ss;
2261 pcb = p->p_thread->td_pcb;
2262 pcb->pcb_gs = regs->r_gs;
2266 #ifndef CPU_DISABLE_SSE
2268 fill_fpregs_xmm(sv_xmm, sv_87)
2269 struct savexmm *sv_xmm;
2270 struct save87 *sv_87;
2272 struct env87 *penv_87 = &sv_87->sv_env;
2273 struct envxmm *penv_xmm = &sv_xmm->sv_env;
2276 /* FPU control/status */
2277 penv_87->en_cw = penv_xmm->en_cw;
2278 penv_87->en_sw = penv_xmm->en_sw;
2279 penv_87->en_tw = penv_xmm->en_tw;
2280 penv_87->en_fip = penv_xmm->en_fip;
2281 penv_87->en_fcs = penv_xmm->en_fcs;
2282 penv_87->en_opcode = penv_xmm->en_opcode;
2283 penv_87->en_foo = penv_xmm->en_foo;
2284 penv_87->en_fos = penv_xmm->en_fos;
2287 for (i = 0; i < 8; ++i)
2288 sv_87->sv_ac[i] = sv_xmm->sv_fp[i].fp_acc;
2290 sv_87->sv_ex_sw = sv_xmm->sv_ex_sw;
2294 set_fpregs_xmm(sv_87, sv_xmm)
2295 struct save87 *sv_87;
2296 struct savexmm *sv_xmm;
2298 struct env87 *penv_87 = &sv_87->sv_env;
2299 struct envxmm *penv_xmm = &sv_xmm->sv_env;
2302 /* FPU control/status */
2303 penv_xmm->en_cw = penv_87->en_cw;
2304 penv_xmm->en_sw = penv_87->en_sw;
2305 penv_xmm->en_tw = penv_87->en_tw;
2306 penv_xmm->en_fip = penv_87->en_fip;
2307 penv_xmm->en_fcs = penv_87->en_fcs;
2308 penv_xmm->en_opcode = penv_87->en_opcode;
2309 penv_xmm->en_foo = penv_87->en_foo;
2310 penv_xmm->en_fos = penv_87->en_fos;
2313 for (i = 0; i < 8; ++i)
2314 sv_xmm->sv_fp[i].fp_acc = sv_87->sv_ac[i];
2316 sv_xmm->sv_ex_sw = sv_87->sv_ex_sw;
2318 #endif /* CPU_DISABLE_SSE */
2321 fill_fpregs(p, fpregs)
2323 struct fpreg *fpregs;
2325 #ifndef CPU_DISABLE_SSE
2327 fill_fpregs_xmm(&p->p_thread->td_pcb->pcb_save.sv_xmm,
2328 (struct save87 *)fpregs);
2331 #endif /* CPU_DISABLE_SSE */
2332 bcopy(&p->p_thread->td_pcb->pcb_save.sv_87, fpregs, sizeof *fpregs);
2337 set_fpregs(p, fpregs)
2339 struct fpreg *fpregs;
2341 #ifndef CPU_DISABLE_SSE
2343 set_fpregs_xmm((struct save87 *)fpregs,
2344 &p->p_thread->td_pcb->pcb_save.sv_xmm);
2347 #endif /* CPU_DISABLE_SSE */
2348 bcopy(fpregs, &p->p_thread->td_pcb->pcb_save.sv_87, sizeof *fpregs);
2353 fill_dbregs(p, dbregs)
2355 struct dbreg *dbregs;
2360 dbregs->dr0 = rdr0();
2361 dbregs->dr1 = rdr1();
2362 dbregs->dr2 = rdr2();
2363 dbregs->dr3 = rdr3();
2364 dbregs->dr4 = rdr4();
2365 dbregs->dr5 = rdr5();
2366 dbregs->dr6 = rdr6();
2367 dbregs->dr7 = rdr7();
2370 pcb = p->p_thread->td_pcb;
2371 dbregs->dr0 = pcb->pcb_dr0;
2372 dbregs->dr1 = pcb->pcb_dr1;
2373 dbregs->dr2 = pcb->pcb_dr2;
2374 dbregs->dr3 = pcb->pcb_dr3;
2377 dbregs->dr6 = pcb->pcb_dr6;
2378 dbregs->dr7 = pcb->pcb_dr7;
2384 set_dbregs(p, dbregs)
2386 struct dbreg *dbregs;
2390 u_int32_t mask1, mask2;
2393 load_dr0(dbregs->dr0);
2394 load_dr1(dbregs->dr1);
2395 load_dr2(dbregs->dr2);
2396 load_dr3(dbregs->dr3);
2397 load_dr4(dbregs->dr4);
2398 load_dr5(dbregs->dr5);
2399 load_dr6(dbregs->dr6);
2400 load_dr7(dbregs->dr7);
2404 * Don't let an illegal value for dr7 get set. Specifically,
2405 * check for undefined settings. Setting these bit patterns
2406 * result in undefined behaviour and can lead to an unexpected
2409 for (i = 0, mask1 = 0x3<<16, mask2 = 0x2<<16; i < 8;
2410 i++, mask1 <<= 2, mask2 <<= 2)
2411 if ((dbregs->dr7 & mask1) == mask2)
2414 pcb = p->p_thread->td_pcb;
2417 * Don't let a process set a breakpoint that is not within the
2418 * process's address space. If a process could do this, it
2419 * could halt the system by setting a breakpoint in the kernel
2420 * (if ddb was enabled). Thus, we need to check to make sure
2421 * that no breakpoints are being enabled for addresses outside
2422 * process's address space, unless, perhaps, we were called by
2425 * XXX - what about when the watched area of the user's
2426 * address space is written into from within the kernel
2427 * ... wouldn't that still cause a breakpoint to be generated
2428 * from within kernel mode?
2431 if (suser_cred(p->p_ucred, 0) != 0) {
2432 if (dbregs->dr7 & 0x3) {
2433 /* dr0 is enabled */
2434 if (dbregs->dr0 >= VM_MAXUSER_ADDRESS)
2438 if (dbregs->dr7 & (0x3<<2)) {
2439 /* dr1 is enabled */
2440 if (dbregs->dr1 >= VM_MAXUSER_ADDRESS)
2444 if (dbregs->dr7 & (0x3<<4)) {
2445 /* dr2 is enabled */
2446 if (dbregs->dr2 >= VM_MAXUSER_ADDRESS)
2450 if (dbregs->dr7 & (0x3<<6)) {
2451 /* dr3 is enabled */
2452 if (dbregs->dr3 >= VM_MAXUSER_ADDRESS)
2457 pcb->pcb_dr0 = dbregs->dr0;
2458 pcb->pcb_dr1 = dbregs->dr1;
2459 pcb->pcb_dr2 = dbregs->dr2;
2460 pcb->pcb_dr3 = dbregs->dr3;
2461 pcb->pcb_dr6 = dbregs->dr6;
2462 pcb->pcb_dr7 = dbregs->dr7;
2464 pcb->pcb_flags |= PCB_DBREGS;
2471 * Return > 0 if a hardware breakpoint has been hit, and the
2472 * breakpoint was in user space. Return 0, otherwise.
2475 user_dbreg_trap(void)
2477 u_int32_t dr7, dr6; /* debug registers dr6 and dr7 */
2478 u_int32_t bp; /* breakpoint bits extracted from dr6 */
2479 int nbp; /* number of breakpoints that triggered */
2480 caddr_t addr[4]; /* breakpoint addresses */
2484 if ((dr7 & 0x000000ff) == 0) {
2486 * all GE and LE bits in the dr7 register are zero,
2487 * thus the trap couldn't have been caused by the
2488 * hardware debug registers
2495 bp = dr6 & 0x0000000f;
2499 * None of the breakpoint bits are set meaning this
2500 * trap was not caused by any of the debug registers
2506 * at least one of the breakpoints were hit, check to see
2507 * which ones and if any of them are user space addresses
2511 addr[nbp++] = (caddr_t)rdr0();
2514 addr[nbp++] = (caddr_t)rdr1();
2517 addr[nbp++] = (caddr_t)rdr2();
2520 addr[nbp++] = (caddr_t)rdr3();
2523 for (i=0; i<nbp; i++) {
2525 (caddr_t)VM_MAXUSER_ADDRESS) {
2527 * addr[i] is in user space
2534 * None of the breakpoints are in user space.
2542 Debugger(const char *msg)
2544 printf("Debugger(\"%s\") called.\n", msg);
2548 #include <sys/disklabel.h>
2551 * Determine the size of the transfer, and make sure it is
2552 * within the boundaries of the partition. Adjust transfer
2553 * if needed, and signal errors or early completion.
2556 bounds_check_with_label(struct buf *bp, struct disklabel *lp, int wlabel)
2558 struct partition *p = lp->d_partitions + dkpart(bp->b_dev);
2559 int labelsect = lp->d_partitions[0].p_offset;
2560 int maxsz = p->p_size,
2561 sz = (bp->b_bcount + DEV_BSIZE - 1) >> DEV_BSHIFT;
2563 /* overwriting disk label ? */
2564 /* XXX should also protect bootstrap in first 8K */
2565 if (bp->b_blkno + p->p_offset <= LABELSECTOR + labelsect &&
2566 #if LABELSECTOR != 0
2567 bp->b_blkno + p->p_offset + sz > LABELSECTOR + labelsect &&
2569 (bp->b_flags & B_READ) == 0 && wlabel == 0) {
2570 bp->b_error = EROFS;
2574 #if defined(DOSBBSECTOR) && defined(notyet)
2575 /* overwriting master boot record? */
2576 if (bp->b_blkno + p->p_offset <= DOSBBSECTOR &&
2577 (bp->b_flags & B_READ) == 0 && wlabel == 0) {
2578 bp->b_error = EROFS;
2583 /* beyond partition? */
2584 if (bp->b_blkno < 0 || bp->b_blkno + sz > maxsz) {
2585 /* if exactly at end of disk, return an EOF */
2586 if (bp->b_blkno == maxsz) {
2587 bp->b_resid = bp->b_bcount;
2590 /* or truncate if part of it fits */
2591 sz = maxsz - bp->b_blkno;
2593 bp->b_error = EINVAL;
2596 bp->b_bcount = sz << DEV_BSHIFT;
2599 bp->b_pblkno = bp->b_blkno + p->p_offset;
2603 bp->b_flags |= B_ERROR;
2610 * Provide inb() and outb() as functions. They are normally only
2611 * available as macros calling inlined functions, thus cannot be
2612 * called inside DDB.
2614 * The actual code is stolen from <machine/cpufunc.h>, and de-inlined.
2620 /* silence compiler warnings */
2622 void outb(u_int, u_char);
2629 * We use %%dx and not %1 here because i/o is done at %dx and not at
2630 * %edx, while gcc generates inferior code (movw instead of movl)
2631 * if we tell it to load (u_short) port.
2633 __asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port));
2638 outb(u_int port, u_char data)
2642 * Use an unnecessary assignment to help gcc's register allocator.
2643 * This make a large difference for gcc-1.40 and a tiny difference
2644 * for gcc-2.6.0. For gcc-1.40, al had to be ``asm("ax")'' for
2645 * best results. gcc-2.6.0 can't handle this.
2648 __asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port));
2655 #include "opt_cpu.h"
2656 #include "opt_htt.h"
2657 #include "opt_user_ldt.h"
2661 * initialize all the SMP locks
2664 /* critical region around IO APIC, apic_imen */
2665 struct spinlock imen_spinlock;
2667 /* Make FAST_INTR() routines sequential */
2668 struct spinlock fast_intr_spinlock;
2670 /* critical region for old style disable_intr/enable_intr */
2671 struct spinlock mpintr_spinlock;
2673 /* critical region around INTR() routines */
2674 struct spinlock intr_spinlock;
2676 /* lock region used by kernel profiling */
2677 struct spinlock mcount_spinlock;
2679 /* locks com (tty) data/hardware accesses: a FASTINTR() */
2680 struct spinlock com_spinlock;
2682 /* locks kernel printfs */
2683 struct spinlock cons_spinlock;
2685 /* lock regions around the clock hardware */
2686 struct spinlock clock_spinlock;
2688 /* lock around the MP rendezvous */
2689 struct spinlock smp_rv_spinlock;
2695 * mp_lock = 0; BSP already owns the MP lock
2698 * Get the initial mp_lock with a count of 1 for the BSP.
2699 * This uses a LOGICAL cpu ID, ie BSP == 0.
2702 cpu_get_initial_mplock();
2704 spin_lock_init(&mcount_spinlock);
2705 spin_lock_init(&fast_intr_spinlock);
2706 spin_lock_init(&intr_spinlock);
2707 spin_lock_init(&mpintr_spinlock);
2708 spin_lock_init(&imen_spinlock);
2709 spin_lock_init(&smp_rv_spinlock);
2710 spin_lock_init(&com_spinlock);
2711 spin_lock_init(&clock_spinlock);
2712 spin_lock_init(&cons_spinlock);