2 * Copyright (c) 1982, 1987, 1990 The Regents of the University of California.
3 * Copyright (c) 1992 Terrence R. Lambert.
4 * Copyright (c) 2003 Peter Wemm.
5 * Copyright (c) 2008 The DragonFly Project.
8 * This code is derived from software contributed to Berkeley by
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. All advertising materials mentioning features or use of this software
20 * must display the following acknowledgement:
21 * This product includes software developed by the University of
22 * California, Berkeley and its contributors.
23 * 4. Neither the name of the University nor the names of its contributors
24 * may be used to endorse or promote products derived from this software
25 * without specific prior written permission.
27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
30 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
39 * from: @(#)machdep.c 7.4 (Berkeley) 6/3/91
40 * $FreeBSD: src/sys/i386/i386/machdep.c,v 1.385.2.30 2003/05/31 08:48:05 alc Exp $
41 * $DragonFly: src/sys/platform/pc64/amd64/machdep.c,v 1.1 2008/08/29 17:07:10 dillon Exp $
44 #include "use_ether.h"
45 //#include "use_npx.h"
47 #include "opt_atalk.h"
48 #include "opt_compat.h"
51 #include "opt_directio.h"
54 #include "opt_msgbuf.h"
57 #include <sys/param.h>
58 #include <sys/systm.h>
59 #include <sys/sysproto.h>
60 #include <sys/signalvar.h>
61 #include <sys/kernel.h>
62 #include <sys/linker.h>
63 #include <sys/malloc.h>
67 #include <sys/reboot.h>
69 #include <sys/msgbuf.h>
70 #include <sys/sysent.h>
71 #include <sys/sysctl.h>
72 #include <sys/vmmeter.h>
74 #include <sys/upcall.h>
75 #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/clock.h>
98 #include <machine/specialreg.h>
100 #include <machine/bootinfo.h>
102 #include <machine/intr_machdep.h> /* for inthand_t */
103 #include <machine/md_var.h>
104 #include <machine/metadata.h>
105 #include <machine/pc/bios.h>
106 #include <machine/pcb_ext.h> /* pcb.h included via sys/user.h */
107 #include <machine/globaldata.h> /* CPU_prvspace */
108 #include <machine/smp.h>
110 #include <machine/perfmon.h>
112 #include <machine/cputypes.h>
115 #include <bus/isa/i386/isa_device.h>
117 #include <machine_base/isa/intr_machdep.h>
118 #include <bus/isa/rtc.h>
119 #include <sys/random.h>
120 #include <sys/ptrace.h>
121 #include <machine/sigframe.h>
123 #define PHYSMAP_ENTRIES 10
125 extern void init386(int first);
126 extern void dblfault_handler(void);
127 extern u_int64_t hammer_time(u_int64_t, u_int64_t);
129 extern void printcpuinfo(void); /* XXX header file */
130 extern void identify_cpu(void);
132 extern void finishidentcpu(void);
134 extern void panicifcpuunsupported(void);
135 extern void initializecpu(void);
137 extern void init_paging(vm_paddr_t *);
139 static void cpu_startup(void *);
140 #ifndef CPU_DISABLE_SSE
141 static void set_fpregs_xmm(struct save87 *, struct savexmm *);
142 static void fill_fpregs_xmm(struct savexmm *, struct save87 *);
143 #endif /* CPU_DISABLE_SSE */
145 extern void ffs_rawread_setup(void);
146 #endif /* DIRECTIO */
147 static void init_locks(void);
149 SYSINIT(cpu, SI_BOOT2_SMP, SI_ORDER_FIRST, cpu_startup, NULL)
152 extern vm_offset_t ksym_start, ksym_end;
155 uint64_t common_lvl4_phys;
156 uint64_t common_lvl3_phys;
161 pdp_entry_t *link_pdpe;
164 int _udatasel, _ucodesel, _ucode32sel;
167 int64_t tsc_offsets[MAXCPU];
169 int64_t tsc_offsets[1];
172 #if defined(SWTCH_OPTIM_STATS)
173 extern int swtch_optim_stats;
174 SYSCTL_INT(_debug, OID_AUTO, swtch_optim_stats,
175 CTLFLAG_RD, &swtch_optim_stats, 0, "");
176 SYSCTL_INT(_debug, OID_AUTO, tlb_flush_count,
177 CTLFLAG_RD, &tlb_flush_count, 0, "");
183 sysctl_hw_physmem(SYSCTL_HANDLER_ARGS)
185 int error = sysctl_handle_int(oidp, 0, ctob(physmem), req);
189 SYSCTL_PROC(_hw, HW_PHYSMEM, physmem, CTLTYPE_INT|CTLFLAG_RD,
190 0, 0, sysctl_hw_physmem, "IU", "");
193 sysctl_hw_usermem(SYSCTL_HANDLER_ARGS)
195 int error = sysctl_handle_int(oidp, 0,
196 ctob(physmem - vmstats.v_wire_count), req);
200 SYSCTL_PROC(_hw, HW_USERMEM, usermem, CTLTYPE_INT|CTLFLAG_RD,
201 0, 0, sysctl_hw_usermem, "IU", "");
204 sysctl_hw_availpages(SYSCTL_HANDLER_ARGS)
207 int error = sysctl_handle_int(oidp, 0,
208 i386_btop(avail_end - avail_start), req);
215 SYSCTL_PROC(_hw, OID_AUTO, availpages, CTLTYPE_INT|CTLFLAG_RD,
216 0, 0, sysctl_hw_availpages, "I", "");
219 sysctl_machdep_msgbuf(SYSCTL_HANDLER_ARGS)
223 /* Unwind the buffer, so that it's linear (possibly starting with
224 * some initial nulls).
226 error=sysctl_handle_opaque(oidp,msgbufp->msg_ptr+msgbufp->msg_bufr,
227 msgbufp->msg_size-msgbufp->msg_bufr,req);
228 if(error) return(error);
229 if(msgbufp->msg_bufr>0) {
230 error=sysctl_handle_opaque(oidp,msgbufp->msg_ptr,
231 msgbufp->msg_bufr,req);
236 SYSCTL_PROC(_machdep, OID_AUTO, msgbuf, CTLTYPE_STRING|CTLFLAG_RD,
237 0, 0, sysctl_machdep_msgbuf, "A","Contents of kernel message buffer");
239 static int msgbuf_clear;
242 sysctl_machdep_msgbuf_clear(SYSCTL_HANDLER_ARGS)
245 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2,
247 if (!error && req->newptr) {
248 /* Clear the buffer and reset write pointer */
249 bzero(msgbufp->msg_ptr,msgbufp->msg_size);
250 msgbufp->msg_bufr=msgbufp->msg_bufx=0;
256 SYSCTL_PROC(_machdep, OID_AUTO, msgbuf_clear, CTLTYPE_INT|CTLFLAG_RW,
257 &msgbuf_clear, 0, sysctl_machdep_msgbuf_clear, "I",
258 "Clear kernel message buffer");
260 vm_paddr_t Maxmem = 0;
263 * The number of PHYSMAP entries must be one less than the number of
264 * PHYSSEG entries because the PHYSMAP entry that spans the largest
265 * physical address that is accessible by ISA DMA is split into two
268 #define PHYSMAP_SIZE (2 * (VM_PHYSSEG_MAX - 1))
270 vm_paddr_t phys_avail[PHYSMAP_SIZE + 2];
271 vm_paddr_t dump_avail[PHYSMAP_SIZE + 2];
273 /* must be 2 less so 0 0 can signal end of chunks */
274 #define PHYS_AVAIL_ARRAY_END ((sizeof(phys_avail) / sizeof(phys_avail[0])) - 2)
275 #define DUMP_AVAIL_ARRAY_END ((sizeof(dump_avail) / sizeof(dump_avail[0])) - 2)
277 static vm_offset_t buffer_sva, buffer_eva;
278 vm_offset_t clean_sva, clean_eva;
279 static vm_offset_t pager_sva, pager_eva;
280 static struct trapframe proc0_tf;
283 cpu_startup(void *dummy)
287 vm_offset_t firstaddr;
289 if (boothowto & RB_VERBOSE)
293 * Good {morning,afternoon,evening,night}.
295 kprintf("%s", version);
298 panicifcpuunsupported();
302 kprintf("real memory = %llu (%lluK bytes)\n",
303 (long long)ptoa(Maxmem), (long long)ptoa(Maxmem) / 1024);
305 * Display any holes after the first chunk of extended memory.
310 kprintf("Physical memory chunk(s):\n");
311 for (indx = 0; phys_avail[indx + 1] != 0; indx += 2) {
312 vm_paddr_t size1 = phys_avail[indx + 1] - phys_avail[indx];
314 kprintf("0x%08llx - 0x%08llx, %llu bytes (%llu pages)\n",
315 (long long)phys_avail[indx],
316 (long long)phys_avail[indx + 1] - 1,
318 (long long)(size1 / PAGE_SIZE));
323 * Allocate space for system data structures.
324 * The first available kernel virtual address is in "v".
325 * As pages of kernel virtual memory are allocated, "v" is incremented.
326 * As pages of memory are allocated and cleared,
327 * "firstaddr" is incremented.
328 * An index into the kernel page table corresponding to the
329 * virtual memory address maintained in "v" is kept in "mapaddr".
333 * Make two passes. The first pass calculates how much memory is
334 * needed and allocates it. The second pass assigns virtual
335 * addresses to the various data structures.
339 v = (caddr_t)firstaddr;
341 #define valloc(name, type, num) \
342 (name) = (type *)v; v = (caddr_t)((name)+(num))
343 #define valloclim(name, type, num, lim) \
344 (name) = (type *)v; v = (caddr_t)((lim) = ((name)+(num)))
347 * The nominal buffer size (and minimum KVA allocation) is BKVASIZE.
348 * For the first 64MB of ram nominally allocate sufficient buffers to
349 * cover 1/4 of our ram. Beyond the first 64MB allocate additional
350 * buffers to cover 1/20 of our ram over 64MB. When auto-sizing
351 * the buffer cache we limit the eventual kva reservation to
354 * factor represents the 1/4 x ram conversion.
357 int factor = 4 * BKVASIZE / 1024;
358 int kbytes = physmem * (PAGE_SIZE / 1024);
362 nbuf += min((kbytes - 4096) / factor, 65536 / factor);
364 nbuf += (kbytes - 65536) * 2 / (factor * 5);
365 if (maxbcache && nbuf > maxbcache / BKVASIZE)
366 nbuf = maxbcache / BKVASIZE;
370 * Do not allow the buffer_map to be more then 1/2 the size of the
373 if (nbuf > (virtual_end - virtual_start) / (BKVASIZE * 2)) {
374 nbuf = (virtual_end - virtual_start) / (BKVASIZE * 2);
375 kprintf("Warning: nbufs capped at %d\n", nbuf);
378 nswbuf = max(min(nbuf/4, 256), 16);
380 if (nswbuf < NSWBUF_MIN)
387 valloc(swbuf, struct buf, nswbuf);
388 valloc(buf, struct buf, nbuf);
391 * End of first pass, size has been calculated so allocate memory
393 if (firstaddr == 0) {
394 size = (vm_size_t)(v - firstaddr);
395 firstaddr = kmem_alloc(&kernel_map, round_page(size));
397 panic("startup: no room for tables");
402 * End of second pass, addresses have been assigned
404 if ((vm_size_t)(v - firstaddr) != size)
405 panic("startup: table size inconsistency");
407 kmem_suballoc(&kernel_map, &clean_map, &clean_sva, &clean_eva,
408 (nbuf*BKVASIZE) + (nswbuf*MAXPHYS) + pager_map_size);
409 kmem_suballoc(&clean_map, &buffer_map, &buffer_sva, &buffer_eva,
411 buffer_map.system_map = 1;
412 kmem_suballoc(&clean_map, &pager_map, &pager_sva, &pager_eva,
413 (nswbuf*MAXPHYS) + pager_map_size);
414 pager_map.system_map = 1;
416 #if defined(USERCONFIG)
418 cninit(); /* the preferred console may have changed */
421 kprintf("avail memory = %lu (%luK bytes)\n",
422 ptoa(vmstats.v_free_count),
423 ptoa(vmstats.v_free_count) / 1024);
426 * Set up buffers, so they can be used to read disk labels.
429 vm_pager_bufferinit();
433 * OK, enough kmem_alloc/malloc state should be up, lets get on with it!
435 mp_start(); /* fire up the APs and APICs */
442 * Send an interrupt to process.
444 * Stack is set up to allow sigcode stored
445 * at top to call routine, followed by kcall
446 * to sigreturn routine below. After sigreturn
447 * resets the signal mask, the stack, and the
448 * frame pointer, it returns to the user
452 sendsig(sig_t catcher, int sig, sigset_t *mask, u_long code)
454 kprintf0("sendsig\n");
455 struct lwp *lp = curthread->td_lwp;
456 struct proc *p = lp->lwp_proc;
457 struct trapframe *regs;
458 struct sigacts *psp = p->p_sigacts;
459 struct sigframe sf, *sfp;
463 regs = lp->lwp_md.md_regs;
464 oonstack = (lp->lwp_sigstk.ss_flags & SS_ONSTACK) ? 1 : 0;
466 /* Save user context */
467 bzero(&sf, sizeof(struct sigframe));
468 sf.sf_uc.uc_sigmask = *mask;
469 sf.sf_uc.uc_stack = lp->lwp_sigstk;
470 sf.sf_uc.uc_mcontext.mc_onstack = oonstack;
471 KKASSERT(__offsetof(struct trapframe, tf_rdi) == 0);
472 bcopy(regs, &sf.sf_uc.uc_mcontext.mc_rdi, sizeof(struct trapframe));
474 /* Make the size of the saved context visible to userland */
475 sf.sf_uc.uc_mcontext.mc_len = sizeof(sf.sf_uc.uc_mcontext);
477 /* Save mailbox pending state for syscall interlock semantics */
478 if (p->p_flag & P_MAILBOX)
479 sf.sf_uc.uc_mcontext.mc_xflags |= PGEX_MAILBOX;
481 /* Allocate and validate space for the signal handler context. */
482 if ((lp->lwp_flag & LWP_ALTSTACK) != 0 && !oonstack &&
483 SIGISMEMBER(psp->ps_sigonstack, sig)) {
484 sp = (char *)(lp->lwp_sigstk.ss_sp + lp->lwp_sigstk.ss_size -
485 sizeof(struct sigframe));
486 lp->lwp_sigstk.ss_flags |= SS_ONSTACK;
488 sp = (char *)regs->tf_rsp - sizeof(struct sigframe);
491 /* Align to 16 bytes */
492 sfp = (struct sigframe *)((intptr_t)sp & ~0xFUL);
494 /* Translate the signal is appropriate */
495 if (p->p_sysent->sv_sigtbl) {
496 if (sig <= p->p_sysent->sv_sigsize)
497 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)];
501 * Build the argument list for the signal handler.
503 * Arguments are in registers (%rdi, %rsi, %rdx, %rcx)
505 regs->tf_rdi = sig; /* argument 1 */
506 regs->tf_rdx = (register_t)&sfp->sf_uc; /* argument 3 */
508 if (SIGISMEMBER(psp->ps_siginfo, sig)) {
510 * Signal handler installed with SA_SIGINFO.
512 * action(signo, siginfo, ucontext)
514 regs->tf_rsi = (register_t)&sfp->sf_si; /* argument 2 */
515 regs->tf_rcx = (register_t)regs->tf_err; /* argument 4 */
516 sf.sf_ahu.sf_action = (__siginfohandler_t *)catcher;
518 /* fill siginfo structure */
519 sf.sf_si.si_signo = sig;
520 sf.sf_si.si_code = code;
521 sf.sf_si.si_addr = (void *)regs->tf_err;
524 * Old FreeBSD-style arguments.
526 * handler (signo, code, [uc], addr)
528 regs->tf_rsi = (register_t)code; /* argument 2 */
529 regs->tf_rcx = (register_t)regs->tf_err; /* argument 4 */
530 sf.sf_ahu.sf_handler = catcher;
534 * If we're a vm86 process, we want to save the segment registers.
535 * We also change eflags to be our emulated eflags, not the actual
539 if (regs->tf_eflags & PSL_VM) {
540 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs;
541 struct vm86_kernel *vm86 = &lp->lwp_thread->td_pcb->pcb_ext->ext_vm86;
543 sf.sf_uc.uc_mcontext.mc_gs = tf->tf_vm86_gs;
544 sf.sf_uc.uc_mcontext.mc_fs = tf->tf_vm86_fs;
545 sf.sf_uc.uc_mcontext.mc_es = tf->tf_vm86_es;
546 sf.sf_uc.uc_mcontext.mc_ds = tf->tf_vm86_ds;
548 if (vm86->vm86_has_vme == 0)
549 sf.sf_uc.uc_mcontext.mc_eflags =
550 (tf->tf_eflags & ~(PSL_VIF | PSL_VIP)) |
551 (vm86->vm86_eflags & (PSL_VIF | PSL_VIP));
554 * Clear PSL_NT to inhibit T_TSSFLT faults on return from
555 * syscalls made by the signal handler. This just avoids
556 * wasting time for our lazy fixup of such faults. PSL_NT
557 * does nothing in vm86 mode, but vm86 programs can set it
558 * almost legitimately in probes for old cpu types.
560 tf->tf_eflags &= ~(PSL_VM | PSL_NT | PSL_VIF | PSL_VIP);
565 * Save the FPU state and reinit the FP unit
567 npxpush(&sf.sf_uc.uc_mcontext);
570 * Copy the sigframe out to the user's stack.
572 if (copyout(&sf, sfp, sizeof(struct sigframe)) != 0) {
574 * Something is wrong with the stack pointer.
575 * ...Kill the process.
580 regs->tf_rsp = (register_t)sfp;
581 regs->tf_rip = PS_STRINGS - *(p->p_sysent->sv_szsigcode);
584 * i386 abi specifies that the direction flag must be cleared
587 regs->tf_rflags &= ~(PSL_T|PSL_D);
590 * 64 bit mode has a code and stack selector but
591 * no data or extra selector. %fs and %gs are not
594 regs->tf_cs = _ucodesel;
595 regs->tf_ss = _udatasel;
599 * Sanitize the trapframe for a virtual kernel passing control to a custom
600 * VM context. Remove any items that would otherwise create a privilage
603 * XXX at the moment we allow userland to set the resume flag. Is this a
607 cpu_sanitize_frame(struct trapframe *frame)
609 kprintf0("cpu_sanitize_frame\n");
610 frame->tf_cs = _ucodesel;
611 frame->tf_ss = _udatasel;
612 /* XXX VM (8086) mode not supported? */
613 frame->tf_rflags &= (PSL_RF | PSL_USERCHANGE | PSL_VM_UNSUPP);
614 frame->tf_rflags |= PSL_RESERVED_DEFAULT | PSL_I;
620 * Sanitize the tls so loading the descriptor does not blow up
621 * on us. For AMD64 we don't have to do anything.
624 cpu_sanitize_tls(struct savetls *tls)
630 * sigreturn(ucontext_t *sigcntxp)
632 * System call to cleanup state after a signal
633 * has been taken. Reset signal mask and
634 * stack state from context left by sendsig (above).
635 * Return to previous pc and psl as specified by
636 * context left by sendsig. Check carefully to
637 * make sure that the user has not modified the
638 * state to gain improper privileges.
640 #define EFL_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0)
641 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL)
644 sys_sigreturn(struct sigreturn_args *uap)
646 struct lwp *lp = curthread->td_lwp;
647 struct proc *p = lp->lwp_proc;
648 struct trapframe *regs;
656 * We have to copy the information into kernel space so userland
657 * can't modify it while we are sniffing it.
659 regs = lp->lwp_md.md_regs;
660 error = copyin(uap->sigcntxp, &uc, sizeof(uc));
664 rflags = ucp->uc_mcontext.mc_rflags;
666 /* VM (8086) mode not supported */
667 rflags &= ~PSL_VM_UNSUPP;
670 if (eflags & PSL_VM) {
671 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs;
672 struct vm86_kernel *vm86;
675 * if pcb_ext == 0 or vm86_inited == 0, the user hasn't
676 * set up the vm86 area, and we can't enter vm86 mode.
678 if (lp->lwp_thread->td_pcb->pcb_ext == 0)
680 vm86 = &lp->lwp_thread->td_pcb->pcb_ext->ext_vm86;
681 if (vm86->vm86_inited == 0)
684 /* go back to user mode if both flags are set */
685 if ((eflags & PSL_VIP) && (eflags & PSL_VIF))
686 trapsignal(lp, SIGBUS, 0);
688 if (vm86->vm86_has_vme) {
689 eflags = (tf->tf_eflags & ~VME_USERCHANGE) |
690 (eflags & VME_USERCHANGE) | PSL_VM;
692 vm86->vm86_eflags = eflags; /* save VIF, VIP */
693 eflags = (tf->tf_eflags & ~VM_USERCHANGE) |
694 (eflags & VM_USERCHANGE) | PSL_VM;
696 bcopy(&ucp->uc_mcontext.mc_gs, tf, sizeof(struct trapframe));
697 tf->tf_eflags = eflags;
698 tf->tf_vm86_ds = tf->tf_ds;
699 tf->tf_vm86_es = tf->tf_es;
700 tf->tf_vm86_fs = tf->tf_fs;
701 tf->tf_vm86_gs = tf->tf_gs;
702 tf->tf_ds = _udatasel;
703 tf->tf_es = _udatasel;
704 tf->tf_fs = _udatasel;
705 tf->tf_gs = _udatasel;
710 * Don't allow users to change privileged or reserved flags.
713 * XXX do allow users to change the privileged flag PSL_RF.
714 * The cpu sets PSL_RF in tf_eflags for faults. Debuggers
715 * should sometimes set it there too. tf_eflags is kept in
716 * the signal context during signal handling and there is no
717 * other place to remember it, so the PSL_RF bit may be
718 * corrupted by the signal handler without us knowing.
719 * Corruption of the PSL_RF bit at worst causes one more or
720 * one less debugger trap, so allowing it is fairly harmless.
722 if (!EFL_SECURE(rflags & ~PSL_RF, regs->tf_rflags & ~PSL_RF)) {
723 kprintf("sigreturn: rflags = 0x%lx\n", (long)rflags);
728 * Don't allow users to load a valid privileged %cs. Let the
729 * hardware check for invalid selectors, excess privilege in
730 * other selectors, invalid %eip's and invalid %esp's.
732 cs = ucp->uc_mcontext.mc_cs;
733 if (!CS_SECURE(cs)) {
734 kprintf("sigreturn: cs = 0x%x\n", cs);
735 trapsignal(lp, SIGBUS, T_PROTFLT);
738 bcopy(&ucp->uc_mcontext.mc_rdi, regs, sizeof(struct trapframe));
742 * Restore the FPU state from the frame
744 npxpop(&ucp->uc_mcontext);
747 * Merge saved signal mailbox pending flag to maintain interlock
748 * semantics against system calls.
750 if (ucp->uc_mcontext.mc_xflags & PGEX_MAILBOX)
751 p->p_flag |= P_MAILBOX;
753 if (ucp->uc_mcontext.mc_onstack & 1)
754 lp->lwp_sigstk.ss_flags |= SS_ONSTACK;
756 lp->lwp_sigstk.ss_flags &= ~SS_ONSTACK;
758 lp->lwp_sigmask = ucp->uc_sigmask;
759 SIG_CANTMASK(lp->lwp_sigmask);
764 * Stack frame on entry to function. %rax will contain the function vector,
765 * %rcx will contain the function data. flags, rcx, and rax will have
766 * already been pushed on the stack.
777 sendupcall(struct vmupcall *vu, int morepending)
779 struct lwp *lp = curthread->td_lwp;
780 struct trapframe *regs;
781 struct upcall upcall;
782 struct upc_frame upc_frame;
786 * If we are a virtual kernel running an emulated user process
787 * context, switch back to the virtual kernel context before
788 * trying to post the signal.
790 if (lp->lwp_vkernel && lp->lwp_vkernel->ve) {
791 lp->lwp_md.md_regs->tf_trapno = 0;
792 vkernel_trap(lp, lp->lwp_md.md_regs);
796 * Get the upcall data structure
798 if (copyin(lp->lwp_upcall, &upcall, sizeof(upcall)) ||
799 copyin((char *)upcall.upc_uthread + upcall.upc_critoff, &crit_count, sizeof(int))
802 kprintf("bad upcall address\n");
807 * If the data structure is already marked pending or has a critical
808 * section count, mark the data structure as pending and return
809 * without doing an upcall. vu_pending is left set.
811 if (upcall.upc_pending || crit_count >= vu->vu_pending) {
812 if (upcall.upc_pending < vu->vu_pending) {
813 upcall.upc_pending = vu->vu_pending;
814 copyout(&upcall.upc_pending, &lp->lwp_upcall->upc_pending,
815 sizeof(upcall.upc_pending));
821 * We can run this upcall now, clear vu_pending.
823 * Bump our critical section count and set or clear the
824 * user pending flag depending on whether more upcalls are
825 * pending. The user will be responsible for calling
826 * upc_dispatch(-1) to process remaining upcalls.
829 upcall.upc_pending = morepending;
830 crit_count += TDPRI_CRIT;
831 copyout(&upcall.upc_pending, &lp->lwp_upcall->upc_pending,
832 sizeof(upcall.upc_pending));
833 copyout(&crit_count, (char *)upcall.upc_uthread + upcall.upc_critoff,
837 * Construct a stack frame and issue the upcall
839 regs = lp->lwp_md.md_regs;
840 upc_frame.rax = regs->tf_rax;
841 upc_frame.rcx = regs->tf_rcx;
842 upc_frame.rdx = regs->tf_rdx;
843 upc_frame.flags = regs->tf_rflags;
844 upc_frame.oldip = regs->tf_rip;
845 if (copyout(&upc_frame, (void *)(regs->tf_rsp - sizeof(upc_frame)),
846 sizeof(upc_frame)) != 0) {
847 kprintf("bad stack on upcall\n");
849 regs->tf_rax = (register_t)vu->vu_func;
850 regs->tf_rcx = (register_t)vu->vu_data;
851 regs->tf_rdx = (register_t)lp->lwp_upcall;
852 regs->tf_rip = (register_t)vu->vu_ctx;
853 regs->tf_rsp -= sizeof(upc_frame);
858 * fetchupcall occurs in the context of a system call, which means that
859 * we have to return EJUSTRETURN in order to prevent eax and edx from
860 * being overwritten by the syscall return value.
862 * if vu is not NULL we return the new context in %edx, the new data in %ecx,
863 * and the function pointer in %eax.
866 fetchupcall(struct vmupcall *vu, int morepending, void *rsp)
868 struct upc_frame upc_frame;
869 struct lwp *lp = curthread->td_lwp;
870 struct trapframe *regs;
872 struct upcall upcall;
875 regs = lp->lwp_md.md_regs;
877 error = copyout(&morepending, &lp->lwp_upcall->upc_pending, sizeof(int));
881 * This jumps us to the next ready context.
884 error = copyin(lp->lwp_upcall, &upcall, sizeof(upcall));
887 error = copyin((char *)upcall.upc_uthread + upcall.upc_critoff, &crit_count, sizeof(int));
888 crit_count += TDPRI_CRIT;
890 error = copyout(&crit_count, (char *)upcall.upc_uthread + upcall.upc_critoff, sizeof(int));
891 regs->tf_rax = (register_t)vu->vu_func;
892 regs->tf_rcx = (register_t)vu->vu_data;
893 regs->tf_rdx = (register_t)lp->lwp_upcall;
894 regs->tf_rip = (register_t)vu->vu_ctx;
895 regs->tf_rsp = (register_t)rsp;
898 * This returns us to the originally interrupted code.
900 error = copyin(rsp, &upc_frame, sizeof(upc_frame));
901 regs->tf_rax = upc_frame.rax;
902 regs->tf_rcx = upc_frame.rcx;
903 regs->tf_rdx = upc_frame.rdx;
904 regs->tf_rflags = (regs->tf_rflags & ~PSL_USERCHANGE) |
905 (upc_frame.flags & PSL_USERCHANGE);
906 regs->tf_rip = upc_frame.oldip;
907 regs->tf_rsp = (register_t)((char *)rsp + sizeof(upc_frame));
916 * Machine dependent boot() routine
918 * I haven't seen anything to put here yet
919 * Possibly some stuff might be grafted back here from boot()
927 * Shutdown the CPU as much as possible
933 __asm__ __volatile("hlt");
937 * cpu_idle() represents the idle LWKT. You cannot return from this function
938 * (unless you want to blow things up!). Instead we look for runnable threads
939 * and loop or halt as appropriate. Giant is not held on entry to the thread.
941 * The main loop is entered with a critical section held, we must release
942 * the critical section before doing anything else. lwkt_switch() will
943 * check for pending interrupts due to entering and exiting its own
946 * Note on cpu_idle_hlt: On an SMP system we rely on a scheduler IPI
947 * to wake a HLTed cpu up. However, there are cases where the idlethread
948 * will be entered with the possibility that no IPI will occur and in such
949 * cases lwkt_switch() sets TDF_IDLE_NOHLT.
951 static int cpu_idle_hlt = 1;
952 static int cpu_idle_hltcnt;
953 static int cpu_idle_spincnt;
954 SYSCTL_INT(_machdep, OID_AUTO, cpu_idle_hlt, CTLFLAG_RW,
955 &cpu_idle_hlt, 0, "Idle loop HLT enable");
956 SYSCTL_INT(_machdep, OID_AUTO, cpu_idle_hltcnt, CTLFLAG_RW,
957 &cpu_idle_hltcnt, 0, "Idle loop entry halts");
958 SYSCTL_INT(_machdep, OID_AUTO, cpu_idle_spincnt, CTLFLAG_RW,
959 &cpu_idle_spincnt, 0, "Idle loop entry spins");
962 cpu_idle_default_hook(void)
965 * We must guarentee that hlt is exactly the instruction
968 __asm __volatile("sti; hlt");
971 /* Other subsystems (e.g., ACPI) can hook this later. */
972 void (*cpu_idle_hook)(void) = cpu_idle_default_hook;
977 struct thread *td = curthread;
980 KKASSERT(td->td_pri < TDPRI_CRIT);
983 * See if there are any LWKTs ready to go.
988 * If we are going to halt call splz unconditionally after
989 * CLIing to catch any interrupt races. Note that we are
990 * at SPL0 and interrupts are enabled.
992 if (cpu_idle_hlt && !lwkt_runnable() &&
993 (td->td_flags & TDF_IDLE_NOHLT) == 0) {
994 __asm __volatile("cli");
996 if (!lwkt_runnable())
1000 __asm __volatile("pause");
1004 td->td_flags &= ~TDF_IDLE_NOHLT;
1007 __asm __volatile("sti; pause");
1009 __asm __volatile("sti");
1017 * This routine is called when the only runnable threads require
1018 * the MP lock, and the scheduler couldn't get it. On a real cpu
1019 * we let the scheduler spin.
1022 cpu_mplock_contested(void)
1028 * This routine is called if a spinlock has been held through the
1029 * exponential backoff period and is seriously contested. On a real cpu
1033 cpu_spinlock_contested(void)
1039 * Clear registers on exec
1042 exec_setregs(u_long entry, u_long stack, u_long ps_strings)
1044 struct thread *td = curthread;
1045 struct lwp *lp = td->td_lwp;
1046 struct pcb *pcb = td->td_pcb;
1047 struct trapframe *regs = lp->lwp_md.md_regs;
1049 kprintf0("exec_setregs\n");
1051 /* was i386_user_cleanup() in NetBSD */
1054 bzero((char *)regs, sizeof(struct trapframe));
1055 regs->tf_rip = entry;
1056 regs->tf_rsp = ((stack - 8) & ~0xFul) + 8; /* align the stack */
1057 regs->tf_rdi = stack; /* argv */
1058 regs->tf_rflags = PSL_USER | (regs->tf_rflags & PSL_T);
1059 regs->tf_ss = _udatasel;
1060 regs->tf_cs = _ucodesel;
1061 regs->tf_rbx = ps_strings;
1064 * Reset the hardware debug registers if they were in use.
1065 * They won't have any meaning for the newly exec'd process.
1067 if (pcb->pcb_flags & PCB_DBREGS) {
1073 pcb->pcb_dr7 = 0; /* JG set bit 10? */
1074 if (pcb == td->td_pcb) {
1076 * Clear the debug registers on the running
1077 * CPU, otherwise they will end up affecting
1078 * the next process we switch to.
1082 pcb->pcb_flags &= ~PCB_DBREGS;
1086 * Initialize the math emulator (if any) for the current process.
1087 * Actually, just clear the bit that says that the emulator has
1088 * been initialized. Initialization is delayed until the process
1089 * traps to the emulator (if it is done at all) mainly because
1090 * emulators don't provide an entry point for initialization.
1092 pcb->pcb_flags &= ~FP_SOFTFP;
1095 * NOTE: do not set CR0_TS here. npxinit() must do it after clearing
1096 * gd_npxthread. Otherwise a preemptive interrupt thread
1097 * may panic in npxdna().
1100 load_cr0(rcr0() | CR0_MP);
1103 * NOTE: The MSR values must be correct so we can return to
1104 * userland. gd_user_fs/gs must be correct so the switch
1105 * code knows what the current MSR values are.
1107 pcb->pcb_fsbase = 0; /* Values loaded from PCB on switch */
1108 pcb->pcb_gsbase = 0;
1109 mdcpu->gd_user_fs = 0; /* Cache of current MSR values */
1110 mdcpu->gd_user_gs = 0;
1111 wrmsr(MSR_FSBASE, 0); /* Set MSR values for return to userland */
1112 wrmsr(MSR_KGSBASE, 0);
1115 /* Initialize the npx (if any) for the current process. */
1116 npxinit(__INITIAL_NPXCW__);
1120 pcb->pcb_ds = _udatasel;
1121 pcb->pcb_es = _udatasel;
1122 pcb->pcb_fs = _udatasel;
1123 pcb->pcb_gs = _udatasel;
1132 cr0 |= CR0_NE; /* Done by npxinit() */
1133 cr0 |= CR0_MP | CR0_TS; /* Done at every execve() too. */
1134 cr0 |= CR0_WP | CR0_AM;
1140 sysctl_machdep_adjkerntz(SYSCTL_HANDLER_ARGS)
1143 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2,
1145 if (!error && req->newptr)
1150 SYSCTL_PROC(_machdep, CPU_ADJKERNTZ, adjkerntz, CTLTYPE_INT|CTLFLAG_RW,
1151 &adjkerntz, 0, sysctl_machdep_adjkerntz, "I", "");
1154 SYSCTL_INT(_machdep, CPU_DISRTCSET, disable_rtc_set,
1155 CTLFLAG_RW, &disable_rtc_set, 0, "");
1159 SYSCTL_STRUCT(_machdep, CPU_BOOTINFO, bootinfo,
1160 CTLFLAG_RD, &bootinfo, bootinfo, "");
1163 SYSCTL_INT(_machdep, CPU_WALLCLOCK, wall_cmos_clock,
1164 CTLFLAG_RW, &wall_cmos_clock, 0, "");
1166 extern u_long bootdev; /* not a cdev_t - encoding is different */
1167 SYSCTL_ULONG(_machdep, OID_AUTO, guessed_bootdev,
1168 CTLFLAG_RD, &bootdev, 0, "Boot device (not in cdev_t format)");
1171 * Initialize 386 and configure to run kernel
1175 * Initialize segments & interrupt table
1179 struct user_segment_descriptor gdt[NGDT * MAXCPU]; /* global descriptor table */
1180 static struct gate_descriptor idt0[NIDT];
1181 struct gate_descriptor *idt = &idt0[0]; /* interrupt descriptor table */
1183 union descriptor ldt[NLDT]; /* local descriptor table */
1186 /* table descriptors - used to load tables by cpu */
1187 struct region_descriptor r_gdt, r_idt;
1189 #if defined(I586_CPU) && !defined(NO_F00F_HACK)
1190 extern int has_f00f_bug;
1193 static char dblfault_stack[PAGE_SIZE] __aligned(16);
1195 /* JG proc0paddr is a virtual address */
1198 char proc0paddr_buff[LWKT_THREAD_STACK];
1201 /* software prototypes -- in more palatable form */
1202 struct soft_segment_descriptor gdt_segs[] = {
1203 /* GNULL_SEL 0 Null Descriptor */
1204 { 0x0, /* segment base address */
1206 0, /* segment type */
1207 0, /* segment descriptor priority level */
1208 0, /* segment descriptor present */
1210 0, /* default 32 vs 16 bit size */
1211 0 /* limit granularity (byte/page units)*/ },
1212 /* GCODE_SEL 1 Code Descriptor for kernel */
1213 { 0x0, /* segment base address */
1214 0xfffff, /* length - all address space */
1215 SDT_MEMERA, /* segment type */
1216 SEL_KPL, /* segment descriptor priority level */
1217 1, /* segment descriptor present */
1219 0, /* default 32 vs 16 bit size */
1220 1 /* limit granularity (byte/page units)*/ },
1221 /* GDATA_SEL 2 Data Descriptor for kernel */
1222 { 0x0, /* segment base address */
1223 0xfffff, /* length - all address space */
1224 SDT_MEMRWA, /* segment type */
1225 SEL_KPL, /* segment descriptor priority level */
1226 1, /* segment descriptor present */
1228 0, /* default 32 vs 16 bit size */
1229 1 /* limit granularity (byte/page units)*/ },
1230 /* GUCODE32_SEL 3 32 bit Code Descriptor for user */
1231 { 0x0, /* segment base address */
1232 0xfffff, /* length - all address space */
1233 SDT_MEMERA, /* segment type */
1234 SEL_UPL, /* 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 /* GUDATA_SEL 4 32/64 bit Data Descriptor for user */
1240 { 0x0, /* segment base address */
1241 0xfffff, /* length - all address space */
1242 SDT_MEMRWA, /* segment type */
1243 SEL_UPL, /* segment descriptor priority level */
1244 1, /* segment descriptor present */
1246 1, /* default 32 vs 16 bit size */
1247 1 /* limit granularity (byte/page units)*/ },
1248 /* GUCODE_SEL 5 64 bit Code Descriptor for user */
1249 { 0x0, /* segment base address */
1250 0xfffff, /* length - all address space */
1251 SDT_MEMERA, /* segment type */
1252 SEL_UPL, /* 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 /* GPROC0_SEL 6 Proc 0 Tss Descriptor */
1259 0x0, /* segment base address */
1260 sizeof(struct amd64tss)-1,/* length - all address space */
1261 SDT_SYSTSS, /* segment type */
1262 SEL_KPL, /* segment descriptor priority level */
1263 1, /* segment descriptor present */
1265 0, /* unused - default 32 vs 16 bit size */
1266 0 /* limit granularity (byte/page units)*/ },
1267 /* Actually, the TSS is a system descriptor which is double size */
1268 { 0x0, /* segment base address */
1270 0, /* segment type */
1271 0, /* segment descriptor priority level */
1272 0, /* segment descriptor present */
1274 0, /* default 32 vs 16 bit size */
1275 0 /* limit granularity (byte/page units)*/ },
1276 /* GUGS32_SEL 8 32 bit GS Descriptor for user */
1277 { 0x0, /* segment base address */
1278 0xfffff, /* length - all address space */
1279 SDT_MEMRWA, /* segment type */
1280 SEL_UPL, /* segment descriptor priority level */
1281 1, /* segment descriptor present */
1283 1, /* default 32 vs 16 bit size */
1284 1 /* limit granularity (byte/page units)*/ },
1288 setidt(int idx, inthand_t *func, int typ, int dpl, int ist)
1290 struct gate_descriptor *ip;
1293 ip->gd_looffset = (uintptr_t)func;
1294 ip->gd_selector = GSEL(GCODE_SEL, SEL_KPL);
1300 ip->gd_hioffset = ((uintptr_t)func)>>16 ;
1303 #define IDTVEC(name) __CONCAT(X,name)
1306 IDTVEC(div), IDTVEC(dbg), IDTVEC(nmi), IDTVEC(bpt), IDTVEC(ofl),
1307 IDTVEC(bnd), IDTVEC(ill), IDTVEC(dna), IDTVEC(fpusegm),
1308 IDTVEC(tss), IDTVEC(missing), IDTVEC(stk), IDTVEC(prot),
1309 IDTVEC(page), IDTVEC(mchk), IDTVEC(rsvd), IDTVEC(fpu), IDTVEC(align),
1310 IDTVEC(xmm), IDTVEC(dblfault),
1311 IDTVEC(fast_syscall), IDTVEC(fast_syscall32);
1313 #ifdef DEBUG_INTERRUPTS
1314 extern inthand_t *Xrsvdary[256];
1318 sdtossd(struct user_segment_descriptor *sd, struct soft_segment_descriptor *ssd)
1320 ssd->ssd_base = (sd->sd_hibase << 24) | sd->sd_lobase;
1321 ssd->ssd_limit = (sd->sd_hilimit << 16) | sd->sd_lolimit;
1322 ssd->ssd_type = sd->sd_type;
1323 ssd->ssd_dpl = sd->sd_dpl;
1324 ssd->ssd_p = sd->sd_p;
1325 ssd->ssd_def32 = sd->sd_def32;
1326 ssd->ssd_gran = sd->sd_gran;
1330 ssdtosd(struct soft_segment_descriptor *ssd, struct user_segment_descriptor *sd)
1333 sd->sd_lobase = (ssd->ssd_base) & 0xffffff;
1334 sd->sd_hibase = (ssd->ssd_base >> 24) & 0xff;
1335 sd->sd_lolimit = (ssd->ssd_limit) & 0xffff;
1336 sd->sd_hilimit = (ssd->ssd_limit >> 16) & 0xf;
1337 sd->sd_type = ssd->ssd_type;
1338 sd->sd_dpl = ssd->ssd_dpl;
1339 sd->sd_p = ssd->ssd_p;
1340 sd->sd_long = ssd->ssd_long;
1341 sd->sd_def32 = ssd->ssd_def32;
1342 sd->sd_gran = ssd->ssd_gran;
1346 ssdtosyssd(struct soft_segment_descriptor *ssd,
1347 struct system_segment_descriptor *sd)
1350 sd->sd_lobase = (ssd->ssd_base) & 0xffffff;
1351 sd->sd_hibase = (ssd->ssd_base >> 24) & 0xfffffffffful;
1352 sd->sd_lolimit = (ssd->ssd_limit) & 0xffff;
1353 sd->sd_hilimit = (ssd->ssd_limit >> 16) & 0xf;
1354 sd->sd_type = ssd->ssd_type;
1355 sd->sd_dpl = ssd->ssd_dpl;
1356 sd->sd_p = ssd->ssd_p;
1357 sd->sd_gran = ssd->ssd_gran;
1363 * Populate the (physmap) array with base/bound pairs describing the
1364 * available physical memory in the system, then test this memory and
1365 * build the phys_avail array describing the actually-available memory.
1367 * If we cannot accurately determine the physical memory map, then use
1368 * value from the 0xE801 call, and failing that, the RTC.
1370 * Total memory size may be set by the kernel environment variable
1371 * hw.physmem or the compile-time define MAXMEM.
1373 * XXX first should be vm_paddr_t.
1376 getmemsize(caddr_t kmdp, u_int64_t first)
1378 int i, off, physmap_idx, pa_indx, da_indx;
1379 vm_paddr_t pa, physmap[PHYSMAP_SIZE];
1380 u_long physmem_tunable;
1382 struct bios_smap *smapbase, *smap, *smapend;
1384 quad_t dcons_addr, dcons_size;
1386 bzero(physmap, sizeof(physmap));
1391 * get memory map from INT 15:E820, kindly supplied by the loader.
1393 * subr_module.c says:
1394 * "Consumer may safely assume that size value precedes data."
1395 * ie: an int32_t immediately precedes smap.
1397 smapbase = (struct bios_smap *)preload_search_info(kmdp,
1398 MODINFO_METADATA | MODINFOMD_SMAP);
1399 if (smapbase == NULL)
1400 panic("No BIOS smap info from loader!");
1402 smapsize = *((u_int32_t *)smapbase - 1);
1403 smapend = (struct bios_smap *)((uintptr_t)smapbase + smapsize);
1405 for (smap = smapbase; smap < smapend; smap++) {
1406 if (boothowto & RB_VERBOSE)
1407 kprintf("SMAP type=%02x base=%016lx len=%016lx\n",
1408 smap->type, smap->base, smap->length);
1410 if (smap->type != SMAP_TYPE_MEMORY)
1413 if (smap->length == 0)
1416 for (i = 0; i <= physmap_idx; i += 2) {
1417 if (smap->base < physmap[i + 1]) {
1418 if (boothowto & RB_VERBOSE)
1420 "Overlapping or non-monotonic memory region, ignoring second region\n");
1425 if (smap->base == physmap[physmap_idx + 1]) {
1426 physmap[physmap_idx + 1] += smap->length;
1431 if (physmap_idx == PHYSMAP_SIZE) {
1433 "Too many segments in the physical address map, giving up\n");
1436 physmap[physmap_idx] = smap->base;
1437 physmap[physmap_idx + 1] = smap->base + smap->length;
1441 * Find the 'base memory' segment for SMP
1444 for (i = 0; i <= physmap_idx; i += 2) {
1445 if (physmap[i] == 0x00000000) {
1446 basemem = physmap[i + 1] / 1024;
1451 panic("BIOS smap did not include a basemem segment!");
1454 /* make hole for AP bootstrap code */
1455 physmap[1] = mp_bootaddress(physmap[1] / 1024);
1459 * Maxmem isn't the "maximum memory", it's one larger than the
1460 * highest page of the physical address space. It should be
1461 * called something like "Maxphyspage". We may adjust this
1462 * based on ``hw.physmem'' and the results of the memory test.
1464 Maxmem = atop(physmap[physmap_idx + 1]);
1467 Maxmem = MAXMEM / 4;
1470 if (TUNABLE_ULONG_FETCH("hw.physmem", &physmem_tunable))
1471 Maxmem = atop(physmem_tunable);
1474 * Don't allow MAXMEM or hw.physmem to extend the amount of memory
1477 if (Maxmem > atop(physmap[physmap_idx + 1]))
1478 Maxmem = atop(physmap[physmap_idx + 1]);
1480 if (atop(physmap[physmap_idx + 1]) != Maxmem &&
1481 (boothowto & RB_VERBOSE))
1482 kprintf("Physical memory use set to %ldK\n", Maxmem * 4);
1484 /* call pmap initialization to make new kernel address space */
1485 pmap_bootstrap(&first, 0);
1488 * Size up each available chunk of physical memory.
1490 physmap[0] = PAGE_SIZE; /* mask off page 0 */
1493 phys_avail[pa_indx++] = physmap[0];
1494 phys_avail[pa_indx] = physmap[0];
1495 dump_avail[da_indx] = physmap[0];
1499 * Get dcons buffer address
1501 if (kgetenv_quad("dcons.addr", &dcons_addr) == 0 ||
1502 kgetenv_quad("dcons.size", &dcons_size) == 0)
1506 * physmap is in bytes, so when converting to page boundaries,
1507 * round up the start address and round down the end address.
1509 for (i = 0; i <= physmap_idx; i += 2) {
1512 end = ptoa((vm_paddr_t)Maxmem);
1513 if (physmap[i + 1] < end)
1514 end = trunc_page(physmap[i + 1]);
1515 for (pa = round_page(physmap[i]); pa < end; pa += PAGE_SIZE) {
1516 int tmp, page_bad, full;
1517 int *ptr = (int *)CADDR1;
1521 * block out kernel memory as not available.
1523 if (pa >= 0x100000 && pa < first)
1527 * block out dcons buffer
1530 && pa >= trunc_page(dcons_addr)
1531 && pa < dcons_addr + dcons_size)
1537 * map page into kernel: valid, read/write,non-cacheable
1539 *pte = pa | PG_V | PG_RW | PG_N;
1544 * Test for alternating 1's and 0's
1546 *(volatile int *)ptr = 0xaaaaaaaa;
1547 if (*(volatile int *)ptr != 0xaaaaaaaa)
1550 * Test for alternating 0's and 1's
1552 *(volatile int *)ptr = 0x55555555;
1553 if (*(volatile int *)ptr != 0x55555555)
1558 *(volatile int *)ptr = 0xffffffff;
1559 if (*(volatile int *)ptr != 0xffffffff)
1564 *(volatile int *)ptr = 0x0;
1565 if (*(volatile int *)ptr != 0x0)
1568 * Restore original value.
1573 * Adjust array of valid/good pages.
1575 if (page_bad == TRUE)
1578 * If this good page is a continuation of the
1579 * previous set of good pages, then just increase
1580 * the end pointer. Otherwise start a new chunk.
1581 * Note that "end" points one higher than end,
1582 * making the range >= start and < end.
1583 * If we're also doing a speculative memory
1584 * test and we at or past the end, bump up Maxmem
1585 * so that we keep going. The first bad page
1586 * will terminate the loop.
1588 if (phys_avail[pa_indx] == pa) {
1589 phys_avail[pa_indx] += PAGE_SIZE;
1592 if (pa_indx == PHYS_AVAIL_ARRAY_END) {
1594 "Too many holes in the physical address space, giving up\n");
1599 phys_avail[pa_indx++] = pa; /* start */
1600 phys_avail[pa_indx] = pa + PAGE_SIZE; /* end */
1604 if (dump_avail[da_indx] == pa) {
1605 dump_avail[da_indx] += PAGE_SIZE;
1608 if (da_indx == DUMP_AVAIL_ARRAY_END) {
1612 dump_avail[da_indx++] = pa; /* start */
1613 dump_avail[da_indx] = pa + PAGE_SIZE; /* end */
1625 * The last chunk must contain at least one page plus the message
1626 * buffer to avoid complicating other code (message buffer address
1627 * calculation, etc.).
1629 while (phys_avail[pa_indx - 1] + PAGE_SIZE +
1630 round_page(MSGBUF_SIZE) >= phys_avail[pa_indx]) {
1631 physmem -= atop(phys_avail[pa_indx] - phys_avail[pa_indx - 1]);
1632 phys_avail[pa_indx--] = 0;
1633 phys_avail[pa_indx--] = 0;
1636 Maxmem = atop(phys_avail[pa_indx]);
1638 /* Trim off space for the message buffer. */
1639 phys_avail[pa_indx] -= round_page(MSGBUF_SIZE);
1641 /* Map the message buffer. */
1642 for (off = 0; off < round_page(MSGBUF_SIZE); off += PAGE_SIZE)
1643 pmap_kenter((vm_offset_t)msgbufp + off, phys_avail[pa_indx] +
1656 * 7 Device Not Available (x87)
1658 * 9 Coprocessor Segment overrun (unsupported, reserved)
1660 * 11 Segment not present
1662 * 13 General Protection
1665 * 16 x87 FP Exception pending
1666 * 17 Alignment Check
1668 * 19 SIMD floating point
1670 * 32-255 INTn/external sources
1673 hammer_time(u_int64_t modulep, u_int64_t physfree)
1678 int metadata_missing, off;
1680 struct mdglobaldata *gd;
1685 * This must be done before the first references
1686 * to CPU_prvspace[0] are made.
1688 init_paging(&physfree);
1691 * Prevent lowering of the ipl if we call tsleep() early.
1693 gd = &CPU_prvspace[0].mdglobaldata;
1694 bzero(gd, sizeof(*gd));
1697 * Note: on both UP and SMP curthread must be set non-NULL
1698 * early in the boot sequence because the system assumes
1699 * that 'curthread' is never NULL.
1702 gd->mi.gd_curthread = &thread0;
1703 thread0.td_gd = &gd->mi;
1705 atdevbase = ISA_HOLE_START + PTOV_OFFSET;
1708 metadata_missing = 0;
1709 if (bootinfo.bi_modulep) {
1710 preload_metadata = (caddr_t)bootinfo.bi_modulep + KERNBASE;
1711 preload_bootstrap_relocate(KERNBASE);
1713 metadata_missing = 1;
1715 if (bootinfo.bi_envp)
1716 kern_envp = (caddr_t)bootinfo.bi_envp + KERNBASE;
1719 preload_metadata = (caddr_t)(uintptr_t)(modulep + PTOV_OFFSET);
1720 preload_bootstrap_relocate(PTOV_OFFSET);
1721 kmdp = preload_search_by_type("elf kernel");
1723 kmdp = preload_search_by_type("elf64 kernel");
1724 boothowto = MD_FETCH(kmdp, MODINFOMD_HOWTO, int);
1725 kern_envp = MD_FETCH(kmdp, MODINFOMD_ENVP, char *) + PTOV_OFFSET;
1727 ksym_start = MD_FETCH(kmdp, MODINFOMD_SSYM, uintptr_t);
1728 ksym_end = MD_FETCH(kmdp, MODINFOMD_ESYM, uintptr_t);
1732 * start with one cpu. Note: with one cpu, ncpus2_shift, ncpus2_mask,
1733 * and ncpus_fit_mask remain 0.
1738 /* Init basic tunables, hz etc */
1742 * make gdt memory segments
1744 gdt_segs[GPROC0_SEL].ssd_base =
1745 (uintptr_t) &CPU_prvspace[0].mdglobaldata.gd_common_tss;
1747 gd->mi.gd_prvspace = &CPU_prvspace[0];
1749 for (x = 0; x < NGDT; x++) {
1750 if (x != GPROC0_SEL && x != (GPROC0_SEL + 1))
1751 ssdtosd(&gdt_segs[x], &gdt[x]);
1753 ssdtosyssd(&gdt_segs[GPROC0_SEL],
1754 (struct system_segment_descriptor *)&gdt[GPROC0_SEL]);
1755 r_gdt.rd_limit = NGDT * sizeof(gdt[0]) - 1;
1756 r_gdt.rd_base = (long) gdt;
1759 wrmsr(MSR_FSBASE, 0); /* User value */
1760 wrmsr(MSR_GSBASE, (u_int64_t)&gd->mi);
1761 wrmsr(MSR_KGSBASE, 0); /* User value while in the kernel */
1763 mi_gdinit(&gd->mi, 0);
1765 proc0paddr = proc0paddr_buff;
1766 mi_proc0init(&gd->mi, proc0paddr);
1767 safepri = TDPRI_MAX;
1769 /* spinlocks and the BGL */
1773 for (x = 0; x < NIDT; x++)
1774 setidt(x, &IDTVEC(rsvd), SDT_SYSIGT, SEL_KPL, 0);
1775 setidt(IDT_DE, &IDTVEC(div), SDT_SYSIGT, SEL_KPL, 0);
1776 setidt(IDT_DB, &IDTVEC(dbg), SDT_SYSIGT, SEL_KPL, 0);
1777 setidt(IDT_NMI, &IDTVEC(nmi), SDT_SYSIGT, SEL_KPL, 1);
1778 setidt(IDT_BP, &IDTVEC(bpt), SDT_SYSIGT, SEL_UPL, 0);
1779 setidt(IDT_OF, &IDTVEC(ofl), SDT_SYSIGT, SEL_KPL, 0);
1780 setidt(IDT_BR, &IDTVEC(bnd), SDT_SYSIGT, SEL_KPL, 0);
1781 setidt(IDT_UD, &IDTVEC(ill), SDT_SYSIGT, SEL_KPL, 0);
1782 setidt(IDT_NM, &IDTVEC(dna), SDT_SYSIGT, SEL_KPL, 0);
1783 setidt(IDT_DF, &IDTVEC(dblfault), SDT_SYSIGT, SEL_KPL, 1);
1784 setidt(IDT_FPUGP, &IDTVEC(fpusegm), SDT_SYSIGT, SEL_KPL, 0);
1785 setidt(IDT_TS, &IDTVEC(tss), SDT_SYSIGT, SEL_KPL, 0);
1786 setidt(IDT_NP, &IDTVEC(missing), SDT_SYSIGT, SEL_KPL, 0);
1787 setidt(IDT_SS, &IDTVEC(stk), SDT_SYSIGT, SEL_KPL, 0);
1788 setidt(IDT_GP, &IDTVEC(prot), SDT_SYSIGT, SEL_KPL, 0);
1789 setidt(IDT_PF, &IDTVEC(page), SDT_SYSIGT, SEL_KPL, 0);
1790 setidt(IDT_MF, &IDTVEC(fpu), SDT_SYSIGT, SEL_KPL, 0);
1791 setidt(IDT_AC, &IDTVEC(align), SDT_SYSIGT, SEL_KPL, 0);
1792 setidt(IDT_MC, &IDTVEC(mchk), SDT_SYSIGT, SEL_KPL, 0);
1793 setidt(IDT_XF, &IDTVEC(xmm), SDT_SYSIGT, SEL_KPL, 0);
1795 r_idt.rd_limit = sizeof(idt0) - 1;
1796 r_idt.rd_base = (long) idt;
1800 * Initialize the console before we print anything out.
1805 if (metadata_missing)
1806 kprintf("WARNING: loader(8) metadata is missing!\n");
1816 if (boothowto & RB_KDB)
1817 Debugger("Boot flags requested debugger");
1821 finishidentcpu(); /* Final stage of CPU initialization */
1822 setidt(6, &IDTVEC(ill), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1823 setidt(13, &IDTVEC(prot), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1825 identify_cpu(); /* Final stage of CPU initialization */
1826 initializecpu(); /* Initialize CPU registers */
1828 /* make an initial tss so cpu can get interrupt stack on syscall! */
1829 gd->gd_common_tss.tss_rsp0 =
1830 (register_t)(thread0.td_kstack +
1831 KSTACK_PAGES * PAGE_SIZE - sizeof(struct pcb));
1832 /* Ensure the stack is aligned to 16 bytes */
1833 gd->gd_common_tss.tss_rsp0 &= ~0xFul;
1834 gd->gd_rsp0 = gd->gd_common_tss.tss_rsp0;
1836 /* doublefault stack space, runs on ist1 */
1837 gd->gd_common_tss.tss_ist1 = (long)&dblfault_stack[sizeof(dblfault_stack)];
1839 /* Set the IO permission bitmap (empty due to tss seg limit) */
1840 gd->gd_common_tss.tss_iobase = sizeof(struct amd64tss);
1842 gsel_tss = GSEL(GPROC0_SEL, SEL_KPL);
1843 gd->gd_tss_gdt = &gdt[GPROC0_SEL];
1844 gd->gd_common_tssd = *gd->gd_tss_gdt;
1847 /* Set up the fast syscall stuff */
1848 msr = rdmsr(MSR_EFER) | EFER_SCE;
1849 wrmsr(MSR_EFER, msr);
1850 wrmsr(MSR_LSTAR, (u_int64_t)IDTVEC(fast_syscall));
1851 wrmsr(MSR_CSTAR, (u_int64_t)IDTVEC(fast_syscall32));
1852 msr = ((u_int64_t)GSEL(GCODE_SEL, SEL_KPL) << 32) |
1853 ((u_int64_t)GSEL(GUCODE32_SEL, SEL_UPL) << 48);
1854 wrmsr(MSR_STAR, msr);
1855 wrmsr(MSR_SF_MASK, PSL_NT|PSL_T|PSL_I|PSL_C|PSL_D);
1857 getmemsize(kmdp, physfree);
1858 init_param2(physmem);
1860 /* now running on new page tables, configured,and u/iom is accessible */
1862 /* Map the message buffer. */
1864 for (off = 0; off < round_page(MSGBUF_SIZE); off += PAGE_SIZE)
1865 pmap_kenter((vm_offset_t)msgbufp + off, avail_end + off);
1868 msgbufinit(msgbufp, MSGBUF_SIZE);
1871 /* transfer to user mode */
1873 _ucodesel = GSEL(GUCODE_SEL, SEL_UPL);
1874 _udatasel = GSEL(GUDATA_SEL, SEL_UPL);
1875 _ucode32sel = GSEL(GUCODE32_SEL, SEL_UPL);
1881 /* setup proc 0's pcb */
1882 thread0.td_pcb->pcb_flags = 0;
1884 thread0.td_pcb->pcb_cr3 = KPML4phys;
1886 thread0.td_pcb->pcb_cr3 = IdlePTD;
1888 thread0.td_pcb->pcb_ext = 0;
1889 lwp0.lwp_md.md_regs = &proc0_tf;
1890 env = kgetenv("kernelname");
1892 strlcpy(kernelname, env, sizeof(kernelname));
1894 /* Location of kernel stack for locore */
1895 return ((u_int64_t)thread0.td_pcb);
1899 * Initialize machine-dependant portions of the global data structure.
1900 * Note that the global data area and cpu0's idlestack in the private
1901 * data space were allocated in locore.
1903 * Note: the idlethread's cpl is 0
1905 * WARNING! Called from early boot, 'mycpu' may not work yet.
1908 cpu_gdinit(struct mdglobaldata *gd, int cpu)
1911 gd->mi.gd_curthread = &gd->mi.gd_idlethread;
1913 lwkt_init_thread(&gd->mi.gd_idlethread,
1914 gd->mi.gd_prvspace->idlestack,
1915 sizeof(gd->mi.gd_prvspace->idlestack),
1916 TDF_MPSAFE, &gd->mi);
1917 lwkt_set_comm(&gd->mi.gd_idlethread, "idle_%d", cpu);
1918 gd->mi.gd_idlethread.td_switch = cpu_lwkt_switch;
1919 gd->mi.gd_idlethread.td_sp -= sizeof(void *);
1920 *(void **)gd->mi.gd_idlethread.td_sp = cpu_idle_restore;
1924 is_globaldata_space(vm_offset_t saddr, vm_offset_t eaddr)
1926 if (saddr >= (vm_offset_t)&CPU_prvspace[0] &&
1927 eaddr <= (vm_offset_t)&CPU_prvspace[MAXCPU]) {
1934 globaldata_find(int cpu)
1936 KKASSERT(cpu >= 0 && cpu < ncpus);
1937 return(&CPU_prvspace[cpu].mdglobaldata.mi);
1940 #if defined(I586_CPU) && !defined(NO_F00F_HACK)
1941 static void f00f_hack(void *unused);
1942 SYSINIT(f00f_hack, SI_BOOT2_BIOS, SI_ORDER_ANY, f00f_hack, NULL);
1945 f00f_hack(void *unused)
1947 struct gate_descriptor *new_idt;
1953 kprintf("Intel Pentium detected, installing workaround for F00F bug\n");
1955 r_idt.rd_limit = sizeof(idt0) - 1;
1957 tmp = kmem_alloc(&kernel_map, PAGE_SIZE * 2);
1959 panic("kmem_alloc returned 0");
1960 if (((unsigned int)tmp & (PAGE_SIZE-1)) != 0)
1961 panic("kmem_alloc returned non-page-aligned memory");
1962 /* Put the first seven entries in the lower page */
1963 new_idt = (struct gate_descriptor*)(tmp + PAGE_SIZE - (7*8));
1964 bcopy(idt, new_idt, sizeof(idt0));
1965 r_idt.rd_base = (int)new_idt;
1968 if (vm_map_protect(&kernel_map, tmp, tmp + PAGE_SIZE,
1969 VM_PROT_READ, FALSE) != KERN_SUCCESS)
1970 panic("vm_map_protect failed");
1973 #endif /* defined(I586_CPU) && !NO_F00F_HACK */
1976 ptrace_set_pc(struct lwp *lp, unsigned long addr)
1978 lp->lwp_md.md_regs->tf_rip = addr;
1983 ptrace_single_step(struct lwp *lp)
1985 lp->lwp_md.md_regs->tf_rflags |= PSL_T;
1990 fill_regs(struct lwp *lp, struct reg *regs)
1993 struct trapframe *tp;
1995 tp = lp->lwp_md.md_regs;
1996 bcopy(&tp->tf_rdi, ®s->r_rdi, sizeof(*regs));
1998 pcb = lp->lwp_thread->td_pcb;
2003 set_regs(struct lwp *lp, struct reg *regs)
2006 struct trapframe *tp;
2008 tp = lp->lwp_md.md_regs;
2009 if (!EFL_SECURE(regs->r_rflags, tp->tf_rflags) ||
2010 !CS_SECURE(regs->r_cs))
2012 bcopy(®s->r_rdi, &tp->tf_rdi, sizeof(*regs));
2013 pcb = lp->lwp_thread->td_pcb;
2017 #ifndef CPU_DISABLE_SSE
2019 fill_fpregs_xmm(struct savexmm *sv_xmm, struct save87 *sv_87)
2021 struct env87 *penv_87 = &sv_87->sv_env;
2022 struct envxmm *penv_xmm = &sv_xmm->sv_env;
2025 /* FPU control/status */
2026 penv_87->en_cw = penv_xmm->en_cw;
2027 penv_87->en_sw = penv_xmm->en_sw;
2028 penv_87->en_tw = penv_xmm->en_tw;
2029 penv_87->en_fip = penv_xmm->en_fip;
2030 penv_87->en_fcs = penv_xmm->en_fcs;
2031 penv_87->en_opcode = penv_xmm->en_opcode;
2032 penv_87->en_foo = penv_xmm->en_foo;
2033 penv_87->en_fos = penv_xmm->en_fos;
2036 for (i = 0; i < 8; ++i)
2037 sv_87->sv_ac[i] = sv_xmm->sv_fp[i].fp_acc;
2039 sv_87->sv_ex_sw = sv_xmm->sv_ex_sw;
2043 set_fpregs_xmm(struct save87 *sv_87, struct savexmm *sv_xmm)
2045 struct env87 *penv_87 = &sv_87->sv_env;
2046 struct envxmm *penv_xmm = &sv_xmm->sv_env;
2049 /* FPU control/status */
2050 penv_xmm->en_cw = penv_87->en_cw;
2051 penv_xmm->en_sw = penv_87->en_sw;
2052 penv_xmm->en_tw = penv_87->en_tw;
2053 penv_xmm->en_fip = penv_87->en_fip;
2054 penv_xmm->en_fcs = penv_87->en_fcs;
2055 penv_xmm->en_opcode = penv_87->en_opcode;
2056 penv_xmm->en_foo = penv_87->en_foo;
2057 penv_xmm->en_fos = penv_87->en_fos;
2060 for (i = 0; i < 8; ++i)
2061 sv_xmm->sv_fp[i].fp_acc = sv_87->sv_ac[i];
2063 sv_xmm->sv_ex_sw = sv_87->sv_ex_sw;
2065 #endif /* CPU_DISABLE_SSE */
2068 fill_fpregs(struct lwp *lp, struct fpreg *fpregs)
2070 #ifndef CPU_DISABLE_SSE
2072 fill_fpregs_xmm(&lp->lwp_thread->td_pcb->pcb_save.sv_xmm,
2073 (struct save87 *)fpregs);
2076 #endif /* CPU_DISABLE_SSE */
2077 bcopy(&lp->lwp_thread->td_pcb->pcb_save.sv_87, fpregs, sizeof *fpregs);
2082 set_fpregs(struct lwp *lp, struct fpreg *fpregs)
2084 #ifndef CPU_DISABLE_SSE
2086 set_fpregs_xmm((struct save87 *)fpregs,
2087 &lp->lwp_thread->td_pcb->pcb_save.sv_xmm);
2090 #endif /* CPU_DISABLE_SSE */
2091 bcopy(fpregs, &lp->lwp_thread->td_pcb->pcb_save.sv_87, sizeof *fpregs);
2096 fill_dbregs(struct lwp *lp, struct dbreg *dbregs)
2099 dbregs->dr[0] = rdr0();
2100 dbregs->dr[1] = rdr1();
2101 dbregs->dr[2] = rdr2();
2102 dbregs->dr[3] = rdr3();
2103 dbregs->dr[4] = rdr4();
2104 dbregs->dr[5] = rdr5();
2105 dbregs->dr[6] = rdr6();
2106 dbregs->dr[7] = rdr7();
2110 pcb = lp->lwp_thread->td_pcb;
2111 dbregs->dr[0] = pcb->pcb_dr0;
2112 dbregs->dr[1] = pcb->pcb_dr1;
2113 dbregs->dr[2] = pcb->pcb_dr2;
2114 dbregs->dr[3] = pcb->pcb_dr3;
2117 dbregs->dr[6] = pcb->pcb_dr6;
2118 dbregs->dr[7] = pcb->pcb_dr7;
2124 set_dbregs(struct lwp *lp, struct dbreg *dbregs)
2127 load_dr0(dbregs->dr[0]);
2128 load_dr1(dbregs->dr[1]);
2129 load_dr2(dbregs->dr[2]);
2130 load_dr3(dbregs->dr[3]);
2131 load_dr4(dbregs->dr[4]);
2132 load_dr5(dbregs->dr[5]);
2133 load_dr6(dbregs->dr[6]);
2134 load_dr7(dbregs->dr[7]);
2137 struct ucred *ucred;
2139 uint64_t mask1, mask2;
2142 * Don't let an illegal value for dr7 get set. Specifically,
2143 * check for undefined settings. Setting these bit patterns
2144 * result in undefined behaviour and can lead to an unexpected
2147 /* JG this loop looks unreadable */
2148 /* Check 4 2-bit fields for invalid patterns.
2149 * These fields are R/Wi, for i = 0..3
2151 /* Is 10 in LENi allowed when running in compatibility mode? */
2152 /* Pattern 10 in R/Wi might be used to indicate
2153 * breakpoint on I/O. Further analysis should be
2154 * carried to decide if it is safe and useful to
2155 * provide access to that capability
2157 for (i = 0, mask1 = 0x3<<16, mask2 = 0x2<<16; i < 4;
2158 i++, mask1 <<= 4, mask2 <<= 4)
2159 if ((dbregs->dr[7] & mask1) == mask2)
2162 pcb = lp->lwp_thread->td_pcb;
2163 ucred = lp->lwp_proc->p_ucred;
2166 * Don't let a process set a breakpoint that is not within the
2167 * process's address space. If a process could do this, it
2168 * could halt the system by setting a breakpoint in the kernel
2169 * (if ddb was enabled). Thus, we need to check to make sure
2170 * that no breakpoints are being enabled for addresses outside
2171 * process's address space, unless, perhaps, we were called by
2174 * XXX - what about when the watched area of the user's
2175 * address space is written into from within the kernel
2176 * ... wouldn't that still cause a breakpoint to be generated
2177 * from within kernel mode?
2180 if (priv_check_cred(ucred, PRIV_ROOT, 0) != 0) {
2181 if (dbregs->dr[7] & 0x3) {
2182 /* dr0 is enabled */
2183 if (dbregs->dr[0] >= VM_MAX_USER_ADDRESS)
2187 if (dbregs->dr[7] & (0x3<<2)) {
2188 /* dr1 is enabled */
2189 if (dbregs->dr[1] >= VM_MAX_USER_ADDRESS)
2193 if (dbregs->dr[7] & (0x3<<4)) {
2194 /* dr2 is enabled */
2195 if (dbregs->dr[2] >= VM_MAX_USER_ADDRESS)
2199 if (dbregs->dr[7] & (0x3<<6)) {
2200 /* dr3 is enabled */
2201 if (dbregs->dr[3] >= VM_MAX_USER_ADDRESS)
2206 pcb->pcb_dr0 = dbregs->dr[0];
2207 pcb->pcb_dr1 = dbregs->dr[1];
2208 pcb->pcb_dr2 = dbregs->dr[2];
2209 pcb->pcb_dr3 = dbregs->dr[3];
2210 pcb->pcb_dr6 = dbregs->dr[6];
2211 pcb->pcb_dr7 = dbregs->dr[7];
2213 pcb->pcb_flags |= PCB_DBREGS;
2220 * Return > 0 if a hardware breakpoint has been hit, and the
2221 * breakpoint was in user space. Return 0, otherwise.
2224 user_dbreg_trap(void)
2226 u_int64_t dr7, dr6; /* debug registers dr6 and dr7 */
2227 u_int64_t bp; /* breakpoint bits extracted from dr6 */
2228 int nbp; /* number of breakpoints that triggered */
2229 caddr_t addr[4]; /* breakpoint addresses */
2233 if ((dr7 & 0xff) == 0) {
2235 * all GE and LE bits in the dr7 register are zero,
2236 * thus the trap couldn't have been caused by the
2237 * hardware debug registers
2248 * None of the breakpoint bits are set meaning this
2249 * trap was not caused by any of the debug registers
2255 * at least one of the breakpoints were hit, check to see
2256 * which ones and if any of them are user space addresses
2260 addr[nbp++] = (caddr_t)rdr0();
2263 addr[nbp++] = (caddr_t)rdr1();
2266 addr[nbp++] = (caddr_t)rdr2();
2269 addr[nbp++] = (caddr_t)rdr3();
2272 for (i=0; i<nbp; i++) {
2274 (caddr_t)VM_MAX_USER_ADDRESS) {
2276 * addr[i] is in user space
2283 * None of the breakpoints are in user space.
2291 Debugger(const char *msg)
2293 kprintf("Debugger(\"%s\") called.\n", msg);
2300 * Provide inb() and outb() as functions. They are normally only
2301 * available as macros calling inlined functions, thus cannot be
2302 * called inside DDB.
2304 * The actual code is stolen from <machine/cpufunc.h>, and de-inlined.
2310 /* silence compiler warnings */
2312 void outb(u_int, u_char);
2319 * We use %%dx and not %1 here because i/o is done at %dx and not at
2320 * %edx, while gcc generates inferior code (movw instead of movl)
2321 * if we tell it to load (u_short) port.
2323 __asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port));
2328 outb(u_int port, u_char data)
2332 * Use an unnecessary assignment to help gcc's register allocator.
2333 * This make a large difference for gcc-1.40 and a tiny difference
2334 * for gcc-2.6.0. For gcc-1.40, al had to be ``asm("ax")'' for
2335 * best results. gcc-2.6.0 can't handle this.
2338 __asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port));
2345 #include "opt_cpu.h"
2349 * initialize all the SMP locks
2352 /* critical region when masking or unmasking interupts */
2353 struct spinlock_deprecated imen_spinlock;
2355 /* Make FAST_INTR() routines sequential */
2356 struct spinlock_deprecated fast_intr_spinlock;
2358 /* critical region for old style disable_intr/enable_intr */
2359 struct spinlock_deprecated mpintr_spinlock;
2361 /* critical region around INTR() routines */
2362 struct spinlock_deprecated intr_spinlock;
2364 /* lock region used by kernel profiling */
2365 struct spinlock_deprecated mcount_spinlock;
2367 /* locks com (tty) data/hardware accesses: a FASTINTR() */
2368 struct spinlock_deprecated com_spinlock;
2370 /* locks kernel kprintfs */
2371 struct spinlock_deprecated cons_spinlock;
2373 /* lock regions around the clock hardware */
2374 struct spinlock_deprecated clock_spinlock;
2376 /* lock around the MP rendezvous */
2377 struct spinlock_deprecated smp_rv_spinlock;
2383 * mp_lock = 0; BSP already owns the MP lock
2386 * Get the initial mp_lock with a count of 1 for the BSP.
2387 * This uses a LOGICAL cpu ID, ie BSP == 0.
2390 cpu_get_initial_mplock();
2393 spin_lock_init(&mcount_spinlock);
2394 spin_lock_init(&fast_intr_spinlock);
2395 spin_lock_init(&intr_spinlock);
2396 spin_lock_init(&mpintr_spinlock);
2397 spin_lock_init(&imen_spinlock);
2398 spin_lock_init(&smp_rv_spinlock);
2399 spin_lock_init(&com_spinlock);
2400 spin_lock_init(&clock_spinlock);
2401 spin_lock_init(&cons_spinlock);
2403 /* our token pool needs to work early */
2404 lwkt_token_pool_init();