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 $
43 //#include "use_npx.h"
45 #include "opt_compat.h"
48 #include "opt_directio.h"
51 #include "opt_msgbuf.h"
54 #include <sys/param.h>
55 #include <sys/systm.h>
56 #include <sys/sysproto.h>
57 #include <sys/signalvar.h>
58 #include <sys/kernel.h>
59 #include <sys/linker.h>
60 #include <sys/malloc.h>
64 #include <sys/reboot.h>
66 #include <sys/msgbuf.h>
67 #include <sys/sysent.h>
68 #include <sys/sysctl.h>
69 #include <sys/vmmeter.h>
71 #include <sys/upcall.h>
72 #include <sys/usched.h>
76 #include <vm/vm_param.h>
78 #include <vm/vm_kern.h>
79 #include <vm/vm_object.h>
80 #include <vm/vm_page.h>
81 #include <vm/vm_map.h>
82 #include <vm/vm_pager.h>
83 #include <vm/vm_extern.h>
85 #include <sys/thread2.h>
86 #include <sys/mplock2.h>
87 #include <sys/mutex2.h>
95 #include <machine/cpu.h>
96 #include <machine/clock.h>
97 #include <machine/specialreg.h>
99 #include <machine/bootinfo.h>
101 #include <machine/md_var.h>
102 #include <machine/metadata.h>
103 #include <machine/pc/bios.h>
104 #include <machine/pcb_ext.h> /* pcb.h included via sys/user.h */
105 #include <machine/globaldata.h> /* CPU_prvspace */
106 #include <machine/smp.h>
108 #include <machine/perfmon.h>
110 #include <machine/cputypes.h>
111 #include <machine/intr_machdep.h>
114 #include <bus/isa/isa_device.h>
116 #include <machine_base/isa/isa_intr.h>
117 #include <bus/isa/rtc.h>
118 #include <sys/random.h>
119 #include <sys/ptrace.h>
120 #include <machine/sigframe.h>
122 #include <sys/machintr.h>
123 #include <machine_base/icu/icu_abi.h>
124 #include <machine_base/icu/elcr_var.h>
125 #include <machine_base/apic/lapic.h>
126 #include <machine_base/apic/ioapic.h>
127 #include <machine_base/apic/ioapic_abi.h>
128 #include <machine/mptable.h>
130 #define PHYSMAP_ENTRIES 10
132 extern u_int64_t hammer_time(u_int64_t, u_int64_t);
134 extern void printcpuinfo(void); /* XXX header file */
135 extern void identify_cpu(void);
137 extern void finishidentcpu(void);
139 extern void panicifcpuunsupported(void);
141 static void cpu_startup(void *);
142 static void pic_finish(void *);
143 static void cpu_finish(void *);
145 #ifndef CPU_DISABLE_SSE
146 static void set_fpregs_xmm(struct save87 *, struct savexmm *);
147 static void fill_fpregs_xmm(struct savexmm *, struct save87 *);
148 #endif /* CPU_DISABLE_SSE */
150 extern void ffs_rawread_setup(void);
151 #endif /* DIRECTIO */
152 static void init_locks(void);
154 SYSINIT(cpu, SI_BOOT2_START_CPU, SI_ORDER_FIRST, cpu_startup, NULL)
155 SYSINIT(pic_finish, SI_BOOT2_FINISH_PIC, SI_ORDER_FIRST, pic_finish, NULL)
156 SYSINIT(cpu_finish, SI_BOOT2_FINISH_CPU, SI_ORDER_FIRST, cpu_finish, NULL)
159 extern vm_offset_t ksym_start, ksym_end;
162 struct privatespace CPU_prvspace[MAXCPU] __aligned(4096); /* XXX */
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, "");
182 u_long ebda_addr = 0;
184 int imcr_present = 0;
186 int naps = 0; /* # of Applications processors */
189 struct mtx dt_lock; /* lock for GDT and LDT */
192 sysctl_hw_physmem(SYSCTL_HANDLER_ARGS)
194 u_long pmem = ctob(physmem);
196 int error = sysctl_handle_long(oidp, &pmem, 0, req);
200 SYSCTL_PROC(_hw, HW_PHYSMEM, physmem, CTLTYPE_ULONG|CTLFLAG_RD,
201 0, 0, sysctl_hw_physmem, "LU", "Total system memory in bytes (number of pages * page size)");
204 sysctl_hw_usermem(SYSCTL_HANDLER_ARGS)
206 int error = sysctl_handle_int(oidp, 0,
207 ctob(physmem - vmstats.v_wire_count), req);
211 SYSCTL_PROC(_hw, HW_USERMEM, usermem, CTLTYPE_INT|CTLFLAG_RD,
212 0, 0, sysctl_hw_usermem, "IU", "");
215 sysctl_hw_availpages(SYSCTL_HANDLER_ARGS)
217 int error = sysctl_handle_int(oidp, 0,
218 x86_64_btop(avail_end - avail_start), req);
222 SYSCTL_PROC(_hw, OID_AUTO, availpages, CTLTYPE_INT|CTLFLAG_RD,
223 0, 0, sysctl_hw_availpages, "I", "");
229 * The number of PHYSMAP entries must be one less than the number of
230 * PHYSSEG entries because the PHYSMAP entry that spans the largest
231 * physical address that is accessible by ISA DMA is split into two
234 #define PHYSMAP_SIZE (2 * (VM_PHYSSEG_MAX - 1))
236 vm_paddr_t phys_avail[PHYSMAP_SIZE + 2];
237 vm_paddr_t dump_avail[PHYSMAP_SIZE + 2];
239 /* must be 2 less so 0 0 can signal end of chunks */
240 #define PHYS_AVAIL_ARRAY_END (NELEM(phys_avail) - 2)
241 #define DUMP_AVAIL_ARRAY_END (NELEM(dump_avail) - 2)
243 static vm_offset_t buffer_sva, buffer_eva;
244 vm_offset_t clean_sva, clean_eva;
245 static vm_offset_t pager_sva, pager_eva;
246 static struct trapframe proc0_tf;
249 cpu_startup(void *dummy)
253 vm_offset_t firstaddr;
256 * Good {morning,afternoon,evening,night}.
258 kprintf("%s", version);
261 panicifcpuunsupported();
265 kprintf("real memory = %ju (%ju MB)\n",
267 (intmax_t)Realmem / 1024 / 1024);
269 * Display any holes after the first chunk of extended memory.
274 kprintf("Physical memory chunk(s):\n");
275 for (indx = 0; phys_avail[indx + 1] != 0; indx += 2) {
276 vm_paddr_t size1 = phys_avail[indx + 1] - phys_avail[indx];
278 kprintf("0x%08jx - 0x%08jx, %ju bytes (%ju pages)\n",
279 (intmax_t)phys_avail[indx],
280 (intmax_t)phys_avail[indx + 1] - 1,
282 (intmax_t)(size1 / PAGE_SIZE));
287 * Allocate space for system data structures.
288 * The first available kernel virtual address is in "v".
289 * As pages of kernel virtual memory are allocated, "v" is incremented.
290 * As pages of memory are allocated and cleared,
291 * "firstaddr" is incremented.
292 * An index into the kernel page table corresponding to the
293 * virtual memory address maintained in "v" is kept in "mapaddr".
297 * Make two passes. The first pass calculates how much memory is
298 * needed and allocates it. The second pass assigns virtual
299 * addresses to the various data structures.
303 v = (caddr_t)firstaddr;
305 #define valloc(name, type, num) \
306 (name) = (type *)v; v = (caddr_t)((name)+(num))
307 #define valloclim(name, type, num, lim) \
308 (name) = (type *)v; v = (caddr_t)((lim) = ((name)+(num)))
311 * The nominal buffer size (and minimum KVA allocation) is BKVASIZE.
312 * For the first 64MB of ram nominally allocate sufficient buffers to
313 * cover 1/4 of our ram. Beyond the first 64MB allocate additional
314 * buffers to cover 1/20 of our ram over 64MB. When auto-sizing
315 * the buffer cache we limit the eventual kva reservation to
318 * factor represents the 1/4 x ram conversion.
321 int factor = 4 * BKVASIZE / 1024;
322 int kbytes = physmem * (PAGE_SIZE / 1024);
326 nbuf += min((kbytes - 4096) / factor, 65536 / factor);
328 nbuf += (kbytes - 65536) * 2 / (factor * 5);
329 if (maxbcache && nbuf > maxbcache / BKVASIZE)
330 nbuf = maxbcache / BKVASIZE;
334 * Do not allow the buffer_map to be more then 1/2 the size of the
337 if (nbuf > (virtual_end - virtual_start) / (BKVASIZE * 2)) {
338 nbuf = (virtual_end - virtual_start) / (BKVASIZE * 2);
339 kprintf("Warning: nbufs capped at %d\n", nbuf);
342 nswbuf = max(min(nbuf/4, 256), 16);
344 if (nswbuf < NSWBUF_MIN)
351 valloc(swbuf, struct buf, nswbuf);
352 valloc(buf, struct buf, nbuf);
355 * End of first pass, size has been calculated so allocate memory
357 if (firstaddr == 0) {
358 size = (vm_size_t)(v - firstaddr);
359 firstaddr = kmem_alloc(&kernel_map, round_page(size));
361 panic("startup: no room for tables");
366 * End of second pass, addresses have been assigned
368 if ((vm_size_t)(v - firstaddr) != size)
369 panic("startup: table size inconsistency");
371 kmem_suballoc(&kernel_map, &clean_map, &clean_sva, &clean_eva,
372 (nbuf*BKVASIZE) + (nswbuf*MAXPHYS) + pager_map_size);
373 kmem_suballoc(&clean_map, &buffer_map, &buffer_sva, &buffer_eva,
375 buffer_map.system_map = 1;
376 kmem_suballoc(&clean_map, &pager_map, &pager_sva, &pager_eva,
377 (nswbuf*MAXPHYS) + pager_map_size);
378 pager_map.system_map = 1;
380 #if defined(USERCONFIG)
382 cninit(); /* the preferred console may have changed */
385 kprintf("avail memory = %ju (%ju MB)\n",
386 (uintmax_t)ptoa(vmstats.v_free_count + vmstats.v_dma_pages),
387 (uintmax_t)ptoa(vmstats.v_free_count + vmstats.v_dma_pages) /
391 * Set up buffers, so they can be used to read disk labels.
394 vm_pager_bufferinit();
398 cpu_finish(void *dummy __unused)
404 pic_finish(void *dummy __unused)
406 /* Log ELCR information */
409 /* Log MPTABLE information */
410 mptable_pci_int_dump();
413 MachIntrABI.finalize();
417 * Send an interrupt to process.
419 * Stack is set up to allow sigcode stored
420 * at top to call routine, followed by kcall
421 * to sigreturn routine below. After sigreturn
422 * resets the signal mask, the stack, and the
423 * frame pointer, it returns to the user
427 sendsig(sig_t catcher, int sig, sigset_t *mask, u_long code)
429 struct lwp *lp = curthread->td_lwp;
430 struct proc *p = lp->lwp_proc;
431 struct trapframe *regs;
432 struct sigacts *psp = p->p_sigacts;
433 struct sigframe sf, *sfp;
437 regs = lp->lwp_md.md_regs;
438 oonstack = (lp->lwp_sigstk.ss_flags & SS_ONSTACK) ? 1 : 0;
440 /* Save user context */
441 bzero(&sf, sizeof(struct sigframe));
442 sf.sf_uc.uc_sigmask = *mask;
443 sf.sf_uc.uc_stack = lp->lwp_sigstk;
444 sf.sf_uc.uc_mcontext.mc_onstack = oonstack;
445 KKASSERT(__offsetof(struct trapframe, tf_rdi) == 0);
446 bcopy(regs, &sf.sf_uc.uc_mcontext.mc_rdi, sizeof(struct trapframe));
448 /* Make the size of the saved context visible to userland */
449 sf.sf_uc.uc_mcontext.mc_len = sizeof(sf.sf_uc.uc_mcontext);
451 /* Allocate and validate space for the signal handler context. */
452 if ((lp->lwp_flags & LWP_ALTSTACK) != 0 && !oonstack &&
453 SIGISMEMBER(psp->ps_sigonstack, sig)) {
454 sp = (char *)(lp->lwp_sigstk.ss_sp + lp->lwp_sigstk.ss_size -
455 sizeof(struct sigframe));
456 lp->lwp_sigstk.ss_flags |= SS_ONSTACK;
458 /* We take red zone into account */
459 sp = (char *)regs->tf_rsp - sizeof(struct sigframe) - 128;
462 /* Align to 16 bytes */
463 sfp = (struct sigframe *)((intptr_t)sp & ~(intptr_t)0xF);
465 /* Translate the signal is appropriate */
466 if (p->p_sysent->sv_sigtbl) {
467 if (sig <= p->p_sysent->sv_sigsize)
468 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)];
472 * Build the argument list for the signal handler.
474 * Arguments are in registers (%rdi, %rsi, %rdx, %rcx)
476 regs->tf_rdi = sig; /* argument 1 */
477 regs->tf_rdx = (register_t)&sfp->sf_uc; /* argument 3 */
479 if (SIGISMEMBER(psp->ps_siginfo, sig)) {
481 * Signal handler installed with SA_SIGINFO.
483 * action(signo, siginfo, ucontext)
485 regs->tf_rsi = (register_t)&sfp->sf_si; /* argument 2 */
486 regs->tf_rcx = (register_t)regs->tf_addr; /* argument 4 */
487 sf.sf_ahu.sf_action = (__siginfohandler_t *)catcher;
489 /* fill siginfo structure */
490 sf.sf_si.si_signo = sig;
491 sf.sf_si.si_code = code;
492 sf.sf_si.si_addr = (void *)regs->tf_addr;
495 * Old FreeBSD-style arguments.
497 * handler (signo, code, [uc], addr)
499 regs->tf_rsi = (register_t)code; /* argument 2 */
500 regs->tf_rcx = (register_t)regs->tf_addr; /* argument 4 */
501 sf.sf_ahu.sf_handler = catcher;
505 * If we're a vm86 process, we want to save the segment registers.
506 * We also change eflags to be our emulated eflags, not the actual
510 if (regs->tf_eflags & PSL_VM) {
511 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs;
512 struct vm86_kernel *vm86 = &lp->lwp_thread->td_pcb->pcb_ext->ext_vm86;
514 sf.sf_uc.uc_mcontext.mc_gs = tf->tf_vm86_gs;
515 sf.sf_uc.uc_mcontext.mc_fs = tf->tf_vm86_fs;
516 sf.sf_uc.uc_mcontext.mc_es = tf->tf_vm86_es;
517 sf.sf_uc.uc_mcontext.mc_ds = tf->tf_vm86_ds;
519 if (vm86->vm86_has_vme == 0)
520 sf.sf_uc.uc_mcontext.mc_eflags =
521 (tf->tf_eflags & ~(PSL_VIF | PSL_VIP)) |
522 (vm86->vm86_eflags & (PSL_VIF | PSL_VIP));
525 * Clear PSL_NT to inhibit T_TSSFLT faults on return from
526 * syscalls made by the signal handler. This just avoids
527 * wasting time for our lazy fixup of such faults. PSL_NT
528 * does nothing in vm86 mode, but vm86 programs can set it
529 * almost legitimately in probes for old cpu types.
531 tf->tf_eflags &= ~(PSL_VM | PSL_NT | PSL_VIF | PSL_VIP);
536 * Save the FPU state and reinit the FP unit
538 npxpush(&sf.sf_uc.uc_mcontext);
541 * Copy the sigframe out to the user's stack.
543 if (copyout(&sf, sfp, sizeof(struct sigframe)) != 0) {
545 * Something is wrong with the stack pointer.
546 * ...Kill the process.
551 regs->tf_rsp = (register_t)sfp;
552 regs->tf_rip = PS_STRINGS - *(p->p_sysent->sv_szsigcode);
555 * i386 abi specifies that the direction flag must be cleared
558 regs->tf_rflags &= ~(PSL_T|PSL_D);
561 * 64 bit mode has a code and stack selector but
562 * no data or extra selector. %fs and %gs are not
565 regs->tf_cs = _ucodesel;
566 regs->tf_ss = _udatasel;
571 * Sanitize the trapframe for a virtual kernel passing control to a custom
572 * VM context. Remove any items that would otherwise create a privilage
575 * XXX at the moment we allow userland to set the resume flag. Is this a
579 cpu_sanitize_frame(struct trapframe *frame)
581 frame->tf_cs = _ucodesel;
582 frame->tf_ss = _udatasel;
583 /* XXX VM (8086) mode not supported? */
584 frame->tf_rflags &= (PSL_RF | PSL_USERCHANGE | PSL_VM_UNSUPP);
585 frame->tf_rflags |= PSL_RESERVED_DEFAULT | PSL_I;
591 * Sanitize the tls so loading the descriptor does not blow up
592 * on us. For x86_64 we don't have to do anything.
595 cpu_sanitize_tls(struct savetls *tls)
601 * sigreturn(ucontext_t *sigcntxp)
603 * System call to cleanup state after a signal
604 * has been taken. Reset signal mask and
605 * stack state from context left by sendsig (above).
606 * Return to previous pc and psl as specified by
607 * context left by sendsig. Check carefully to
608 * make sure that the user has not modified the
609 * state to gain improper privileges.
613 #define EFL_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0)
614 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL)
617 sys_sigreturn(struct sigreturn_args *uap)
619 struct lwp *lp = curthread->td_lwp;
620 struct trapframe *regs;
628 * We have to copy the information into kernel space so userland
629 * can't modify it while we are sniffing it.
631 regs = lp->lwp_md.md_regs;
632 error = copyin(uap->sigcntxp, &uc, sizeof(uc));
636 rflags = ucp->uc_mcontext.mc_rflags;
638 /* VM (8086) mode not supported */
639 rflags &= ~PSL_VM_UNSUPP;
642 if (eflags & PSL_VM) {
643 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs;
644 struct vm86_kernel *vm86;
647 * if pcb_ext == 0 or vm86_inited == 0, the user hasn't
648 * set up the vm86 area, and we can't enter vm86 mode.
650 if (lp->lwp_thread->td_pcb->pcb_ext == 0)
652 vm86 = &lp->lwp_thread->td_pcb->pcb_ext->ext_vm86;
653 if (vm86->vm86_inited == 0)
656 /* go back to user mode if both flags are set */
657 if ((eflags & PSL_VIP) && (eflags & PSL_VIF))
658 trapsignal(lp, SIGBUS, 0);
660 if (vm86->vm86_has_vme) {
661 eflags = (tf->tf_eflags & ~VME_USERCHANGE) |
662 (eflags & VME_USERCHANGE) | PSL_VM;
664 vm86->vm86_eflags = eflags; /* save VIF, VIP */
665 eflags = (tf->tf_eflags & ~VM_USERCHANGE) |
666 (eflags & VM_USERCHANGE) | PSL_VM;
668 bcopy(&ucp->uc_mcontext.mc_gs, tf, sizeof(struct trapframe));
669 tf->tf_eflags = eflags;
670 tf->tf_vm86_ds = tf->tf_ds;
671 tf->tf_vm86_es = tf->tf_es;
672 tf->tf_vm86_fs = tf->tf_fs;
673 tf->tf_vm86_gs = tf->tf_gs;
674 tf->tf_ds = _udatasel;
675 tf->tf_es = _udatasel;
676 tf->tf_fs = _udatasel;
677 tf->tf_gs = _udatasel;
682 * Don't allow users to change privileged or reserved flags.
685 * XXX do allow users to change the privileged flag PSL_RF.
686 * The cpu sets PSL_RF in tf_eflags for faults. Debuggers
687 * should sometimes set it there too. tf_eflags is kept in
688 * the signal context during signal handling and there is no
689 * other place to remember it, so the PSL_RF bit may be
690 * corrupted by the signal handler without us knowing.
691 * Corruption of the PSL_RF bit at worst causes one more or
692 * one less debugger trap, so allowing it is fairly harmless.
694 if (!EFL_SECURE(rflags & ~PSL_RF, regs->tf_rflags & ~PSL_RF)) {
695 kprintf("sigreturn: rflags = 0x%lx\n", (long)rflags);
700 * Don't allow users to load a valid privileged %cs. Let the
701 * hardware check for invalid selectors, excess privilege in
702 * other selectors, invalid %eip's and invalid %esp's.
704 cs = ucp->uc_mcontext.mc_cs;
705 if (!CS_SECURE(cs)) {
706 kprintf("sigreturn: cs = 0x%x\n", cs);
707 trapsignal(lp, SIGBUS, T_PROTFLT);
710 bcopy(&ucp->uc_mcontext.mc_rdi, regs, sizeof(struct trapframe));
714 * Restore the FPU state from the frame
717 npxpop(&ucp->uc_mcontext);
719 if (ucp->uc_mcontext.mc_onstack & 1)
720 lp->lwp_sigstk.ss_flags |= SS_ONSTACK;
722 lp->lwp_sigstk.ss_flags &= ~SS_ONSTACK;
724 lp->lwp_sigmask = ucp->uc_sigmask;
725 SIG_CANTMASK(lp->lwp_sigmask);
732 * Stack frame on entry to function. %rax will contain the function vector,
733 * %rcx will contain the function data. flags, rcx, and rax will have
734 * already been pushed on the stack.
745 sendupcall(struct vmupcall *vu, int morepending)
747 struct lwp *lp = curthread->td_lwp;
748 struct trapframe *regs;
749 struct upcall upcall;
750 struct upc_frame upc_frame;
754 * If we are a virtual kernel running an emulated user process
755 * context, switch back to the virtual kernel context before
756 * trying to post the signal.
758 if (lp->lwp_vkernel && lp->lwp_vkernel->ve) {
759 lp->lwp_md.md_regs->tf_trapno = 0;
760 vkernel_trap(lp, lp->lwp_md.md_regs);
764 * Get the upcall data structure
766 if (copyin(lp->lwp_upcall, &upcall, sizeof(upcall)) ||
767 copyin((char *)upcall.upc_uthread + upcall.upc_critoff, &crit_count, sizeof(int))
770 kprintf("bad upcall address\n");
775 * If the data structure is already marked pending or has a critical
776 * section count, mark the data structure as pending and return
777 * without doing an upcall. vu_pending is left set.
779 if (upcall.upc_pending || crit_count >= vu->vu_pending) {
780 if (upcall.upc_pending < vu->vu_pending) {
781 upcall.upc_pending = vu->vu_pending;
782 copyout(&upcall.upc_pending, &lp->lwp_upcall->upc_pending,
783 sizeof(upcall.upc_pending));
789 * We can run this upcall now, clear vu_pending.
791 * Bump our critical section count and set or clear the
792 * user pending flag depending on whether more upcalls are
793 * pending. The user will be responsible for calling
794 * upc_dispatch(-1) to process remaining upcalls.
797 upcall.upc_pending = morepending;
799 copyout(&upcall.upc_pending, &lp->lwp_upcall->upc_pending,
800 sizeof(upcall.upc_pending));
801 copyout(&crit_count, (char *)upcall.upc_uthread + upcall.upc_critoff,
805 * Construct a stack frame and issue the upcall
807 regs = lp->lwp_md.md_regs;
808 upc_frame.rax = regs->tf_rax;
809 upc_frame.rcx = regs->tf_rcx;
810 upc_frame.rdx = regs->tf_rdx;
811 upc_frame.flags = regs->tf_rflags;
812 upc_frame.oldip = regs->tf_rip;
813 if (copyout(&upc_frame, (void *)(regs->tf_rsp - sizeof(upc_frame) - 128),
814 sizeof(upc_frame)) != 0) {
815 kprintf("bad stack on upcall\n");
817 regs->tf_rax = (register_t)vu->vu_func;
818 regs->tf_rcx = (register_t)vu->vu_data;
819 regs->tf_rdx = (register_t)lp->lwp_upcall;
820 regs->tf_rip = (register_t)vu->vu_ctx;
821 regs->tf_rsp -= sizeof(upc_frame) + 128;
826 * fetchupcall occurs in the context of a system call, which means that
827 * we have to return EJUSTRETURN in order to prevent eax and edx from
828 * being overwritten by the syscall return value.
830 * if vu is not NULL we return the new context in %edx, the new data in %ecx,
831 * and the function pointer in %eax.
834 fetchupcall(struct vmupcall *vu, int morepending, void *rsp)
836 struct upc_frame upc_frame;
837 struct lwp *lp = curthread->td_lwp;
838 struct trapframe *regs;
840 struct upcall upcall;
843 regs = lp->lwp_md.md_regs;
845 error = copyout(&morepending, &lp->lwp_upcall->upc_pending, sizeof(int));
849 * This jumps us to the next ready context.
852 error = copyin(lp->lwp_upcall, &upcall, sizeof(upcall));
855 error = copyin((char *)upcall.upc_uthread + upcall.upc_critoff, &crit_count, sizeof(int));
858 error = copyout(&crit_count, (char *)upcall.upc_uthread + upcall.upc_critoff, sizeof(int));
859 regs->tf_rax = (register_t)vu->vu_func;
860 regs->tf_rcx = (register_t)vu->vu_data;
861 regs->tf_rdx = (register_t)lp->lwp_upcall;
862 regs->tf_rip = (register_t)vu->vu_ctx;
863 regs->tf_rsp = (register_t)rsp;
866 * This returns us to the originally interrupted code.
868 error = copyin(rsp, &upc_frame, sizeof(upc_frame));
869 regs->tf_rax = upc_frame.rax;
870 regs->tf_rcx = upc_frame.rcx;
871 regs->tf_rdx = upc_frame.rdx;
872 regs->tf_rflags = (regs->tf_rflags & ~PSL_USERCHANGE) |
873 (upc_frame.flags & PSL_USERCHANGE);
874 regs->tf_rip = upc_frame.oldip;
875 regs->tf_rsp = (register_t)((char *)rsp + sizeof(upc_frame));
884 * Machine dependent boot() routine
886 * I haven't seen anything to put here yet
887 * Possibly some stuff might be grafted back here from boot()
895 * Shutdown the CPU as much as possible
901 __asm__ __volatile("hlt");
905 * cpu_idle() represents the idle LWKT. You cannot return from this function
906 * (unless you want to blow things up!). Instead we look for runnable threads
907 * and loop or halt as appropriate. Giant is not held on entry to the thread.
909 * The main loop is entered with a critical section held, we must release
910 * the critical section before doing anything else. lwkt_switch() will
911 * check for pending interrupts due to entering and exiting its own
914 * NOTE: On an SMP system we rely on a scheduler IPI to wake a HLTed cpu up.
915 * However, there are cases where the idlethread will be entered with
916 * the possibility that no IPI will occur and in such cases
917 * lwkt_switch() sets TDF_IDLE_NOHLT.
919 * NOTE: cpu_idle_hlt again defaults to 2 (use ACPI sleep states). Set to
920 * 1 to just use hlt and for debugging purposes.
922 * NOTE: cpu_idle_repeat determines how many entries into the idle thread
923 * must occur before it starts using ACPI halt.
925 static int cpu_idle_hlt = 2;
926 static int cpu_idle_hltcnt;
927 static int cpu_idle_spincnt;
928 static u_int cpu_idle_repeat = 4;
929 SYSCTL_INT(_machdep, OID_AUTO, cpu_idle_hlt, CTLFLAG_RW,
930 &cpu_idle_hlt, 0, "Idle loop HLT enable");
931 SYSCTL_INT(_machdep, OID_AUTO, cpu_idle_hltcnt, CTLFLAG_RW,
932 &cpu_idle_hltcnt, 0, "Idle loop entry halts");
933 SYSCTL_INT(_machdep, OID_AUTO, cpu_idle_spincnt, CTLFLAG_RW,
934 &cpu_idle_spincnt, 0, "Idle loop entry spins");
935 SYSCTL_INT(_machdep, OID_AUTO, cpu_idle_repeat, CTLFLAG_RW,
936 &cpu_idle_repeat, 0, "Idle entries before acpi hlt");
939 cpu_idle_default_hook(void)
942 * We must guarentee that hlt is exactly the instruction
945 __asm __volatile("sti; hlt");
948 /* Other subsystems (e.g., ACPI) can hook this later. */
949 void (*cpu_idle_hook)(void) = cpu_idle_default_hook;
954 globaldata_t gd = mycpu;
955 struct thread *td __debugvar = gd->gd_curthread;
960 KKASSERT(td->td_critcount == 0);
963 * See if there are any LWKTs ready to go.
968 * When halting inside a cli we must check for reqflags
969 * races, particularly [re]schedule requests. Running
970 * splz() does the job.
973 * 0 Never halt, just spin
975 * 1 Always use HLT (or MONITOR/MWAIT if avail).
976 * This typically eats more power than the
979 * 2 Use HLT/MONITOR/MWAIT up to a point and then
980 * use the ACPI halt (default). This is a hybrid
981 * approach. See machdep.cpu_idle_repeat.
983 * 3 Always use the ACPI halt. This typically
984 * eats the least amount of power but the cpu
985 * will be slow waking up. Slows down e.g.
986 * compiles and other pipe/event oriented stuff.
988 * NOTE: Interrupts are enabled and we are not in a critical
991 * NOTE: Preemptions do not reset gd_idle_repeat. Also we
992 * don't bother capping gd_idle_repeat, it is ok if
995 ++gd->gd_idle_repeat;
996 reqflags = gd->gd_reqflags;
997 quick = (cpu_idle_hlt == 1) ||
999 gd->gd_idle_repeat < cpu_idle_repeat);
1001 if (quick && (cpu_mi_feature & CPU_MI_MONITOR) &&
1002 (reqflags & RQF_IDLECHECK_WK_MASK) == 0) {
1004 cpu_mmw_pause_int(&gd->gd_reqflags, reqflags);
1006 } else if (cpu_idle_hlt) {
1007 __asm __volatile("cli");
1009 if ((gd->gd_reqflags & RQF_IDLECHECK_WK_MASK) == 0) {
1011 cpu_idle_default_hook();
1015 __asm __volatile("sti");
1019 __asm __volatile("sti");
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)
1041 * Clear registers on exec
1044 exec_setregs(u_long entry, u_long stack, u_long ps_strings)
1046 struct thread *td = curthread;
1047 struct lwp *lp = td->td_lwp;
1048 struct pcb *pcb = td->td_pcb;
1049 struct trapframe *regs = lp->lwp_md.md_regs;
1051 /* was i386_user_cleanup() in NetBSD */
1055 bzero((char *)regs, sizeof(struct trapframe));
1056 regs->tf_rip = entry;
1057 regs->tf_rsp = ((stack - 8) & ~0xFul) + 8; /* align the stack */
1058 regs->tf_rdi = stack; /* argv */
1059 regs->tf_rflags = PSL_USER | (regs->tf_rflags & PSL_T);
1060 regs->tf_ss = _udatasel;
1061 regs->tf_cs = _ucodesel;
1062 regs->tf_rbx = ps_strings;
1065 * Reset the hardware debug registers if they were in use.
1066 * They won't have any meaning for the newly exec'd process.
1068 if (pcb->pcb_flags & PCB_DBREGS) {
1074 pcb->pcb_dr7 = 0; /* JG set bit 10? */
1075 if (pcb == td->td_pcb) {
1077 * Clear the debug registers on the running
1078 * CPU, otherwise they will end up affecting
1079 * the next process we switch to.
1083 pcb->pcb_flags &= ~PCB_DBREGS;
1087 * Initialize the math emulator (if any) for the current process.
1088 * Actually, just clear the bit that says that the emulator has
1089 * been initialized. Initialization is delayed until the process
1090 * traps to the emulator (if it is done at all) mainly because
1091 * emulators don't provide an entry point for initialization.
1093 pcb->pcb_flags &= ~FP_SOFTFP;
1096 * NOTE: do not set CR0_TS here. npxinit() must do it after clearing
1097 * gd_npxthread. Otherwise a preemptive interrupt thread
1098 * may panic in npxdna().
1101 load_cr0(rcr0() | CR0_MP);
1104 * NOTE: The MSR values must be correct so we can return to
1105 * userland. gd_user_fs/gs must be correct so the switch
1106 * code knows what the current MSR values are.
1108 pcb->pcb_fsbase = 0; /* Values loaded from PCB on switch */
1109 pcb->pcb_gsbase = 0;
1110 mdcpu->gd_user_fs = 0; /* Cache of current MSR values */
1111 mdcpu->gd_user_gs = 0;
1112 wrmsr(MSR_FSBASE, 0); /* Set MSR values for return to userland */
1113 wrmsr(MSR_KGSBASE, 0);
1115 /* Initialize the npx (if any) for the current process. */
1116 npxinit(__INITIAL_NPXCW__);
1119 pcb->pcb_ds = _udatasel;
1120 pcb->pcb_es = _udatasel;
1121 pcb->pcb_fs = _udatasel;
1122 pcb->pcb_gs = _udatasel;
1131 cr0 |= CR0_NE; /* Done by npxinit() */
1132 cr0 |= CR0_MP | CR0_TS; /* Done at every execve() too. */
1133 cr0 |= CR0_WP | CR0_AM;
1139 sysctl_machdep_adjkerntz(SYSCTL_HANDLER_ARGS)
1142 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2,
1144 if (!error && req->newptr)
1149 SYSCTL_PROC(_machdep, CPU_ADJKERNTZ, adjkerntz, CTLTYPE_INT|CTLFLAG_RW,
1150 &adjkerntz, 0, sysctl_machdep_adjkerntz, "I", "");
1152 SYSCTL_INT(_machdep, CPU_DISRTCSET, disable_rtc_set,
1153 CTLFLAG_RW, &disable_rtc_set, 0, "");
1156 SYSCTL_STRUCT(_machdep, CPU_BOOTINFO, bootinfo,
1157 CTLFLAG_RD, &bootinfo, bootinfo, "");
1160 SYSCTL_INT(_machdep, CPU_WALLCLOCK, wall_cmos_clock,
1161 CTLFLAG_RW, &wall_cmos_clock, 0, "");
1163 extern u_long bootdev; /* not a cdev_t - encoding is different */
1164 SYSCTL_ULONG(_machdep, OID_AUTO, guessed_bootdev,
1165 CTLFLAG_RD, &bootdev, 0, "Boot device (not in cdev_t format)");
1168 * Initialize 386 and configure to run kernel
1172 * Initialize segments & interrupt table
1176 struct user_segment_descriptor gdt[NGDT * MAXCPU]; /* global descriptor table */
1177 struct gate_descriptor idt_arr[MAXCPU][NIDT];
1179 union descriptor ldt[NLDT]; /* local descriptor table */
1182 /* table descriptors - used to load tables by cpu */
1183 struct region_descriptor r_gdt;
1184 struct region_descriptor r_idt_arr[MAXCPU];
1186 /* JG proc0paddr is a virtual address */
1189 char proc0paddr_buff[LWKT_THREAD_STACK];
1192 /* software prototypes -- in more palatable form */
1193 struct soft_segment_descriptor gdt_segs[] = {
1194 /* GNULL_SEL 0 Null Descriptor */
1195 { 0x0, /* segment base address */
1197 0, /* segment type */
1198 0, /* segment descriptor priority level */
1199 0, /* segment descriptor present */
1201 0, /* default 32 vs 16 bit size */
1202 0 /* limit granularity (byte/page units)*/ },
1203 /* GCODE_SEL 1 Code Descriptor for kernel */
1204 { 0x0, /* segment base address */
1205 0xfffff, /* length - all address space */
1206 SDT_MEMERA, /* segment type */
1207 SEL_KPL, /* segment descriptor priority level */
1208 1, /* segment descriptor present */
1210 0, /* default 32 vs 16 bit size */
1211 1 /* limit granularity (byte/page units)*/ },
1212 /* GDATA_SEL 2 Data Descriptor for kernel */
1213 { 0x0, /* segment base address */
1214 0xfffff, /* length - all address space */
1215 SDT_MEMRWA, /* 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 /* GUCODE32_SEL 3 32 bit Code Descriptor for user */
1222 { 0x0, /* segment base address */
1223 0xfffff, /* length - all address space */
1224 SDT_MEMERA, /* segment type */
1225 SEL_UPL, /* segment descriptor priority level */
1226 1, /* segment descriptor present */
1228 1, /* default 32 vs 16 bit size */
1229 1 /* limit granularity (byte/page units)*/ },
1230 /* GUDATA_SEL 4 32/64 bit Data Descriptor for user */
1231 { 0x0, /* segment base address */
1232 0xfffff, /* length - all address space */
1233 SDT_MEMRWA, /* 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 /* GUCODE_SEL 5 64 bit Code Descriptor for user */
1240 { 0x0, /* segment base address */
1241 0xfffff, /* length - all address space */
1242 SDT_MEMERA, /* segment type */
1243 SEL_UPL, /* segment descriptor priority level */
1244 1, /* segment descriptor present */
1246 0, /* default 32 vs 16 bit size */
1247 1 /* limit granularity (byte/page units)*/ },
1248 /* GPROC0_SEL 6 Proc 0 Tss Descriptor */
1250 0x0, /* segment base address */
1251 sizeof(struct x86_64tss)-1,/* length - all address space */
1252 SDT_SYSTSS, /* segment type */
1253 SEL_KPL, /* segment descriptor priority level */
1254 1, /* segment descriptor present */
1256 0, /* unused - default 32 vs 16 bit size */
1257 0 /* limit granularity (byte/page units)*/ },
1258 /* Actually, the TSS is a system descriptor which is double size */
1259 { 0x0, /* segment base address */
1261 0, /* segment type */
1262 0, /* segment descriptor priority level */
1263 0, /* segment descriptor present */
1265 0, /* default 32 vs 16 bit size */
1266 0 /* limit granularity (byte/page units)*/ },
1267 /* GUGS32_SEL 8 32 bit GS Descriptor for user */
1268 { 0x0, /* segment base address */
1269 0xfffff, /* length - all address space */
1270 SDT_MEMRWA, /* segment type */
1271 SEL_UPL, /* segment descriptor priority level */
1272 1, /* segment descriptor present */
1274 1, /* default 32 vs 16 bit size */
1275 1 /* limit granularity (byte/page units)*/ },
1279 setidt_global(int idx, inthand_t *func, int typ, int dpl, int ist)
1283 for (cpu = 0; cpu < MAXCPU; ++cpu) {
1284 struct gate_descriptor *ip = &idt_arr[cpu][idx];
1286 ip->gd_looffset = (uintptr_t)func;
1287 ip->gd_selector = GSEL(GCODE_SEL, SEL_KPL);
1293 ip->gd_hioffset = ((uintptr_t)func)>>16 ;
1298 setidt(int idx, inthand_t *func, int typ, int dpl, int ist, int cpu)
1300 struct gate_descriptor *ip;
1302 KASSERT(cpu >= 0 && cpu < ncpus, ("invalid cpu %d", cpu));
1304 ip = &idt_arr[cpu][idx];
1305 ip->gd_looffset = (uintptr_t)func;
1306 ip->gd_selector = GSEL(GCODE_SEL, SEL_KPL);
1312 ip->gd_hioffset = ((uintptr_t)func)>>16 ;
1315 #define IDTVEC(name) __CONCAT(X,name)
1318 IDTVEC(div), IDTVEC(dbg), IDTVEC(nmi), IDTVEC(bpt), IDTVEC(ofl),
1319 IDTVEC(bnd), IDTVEC(ill), IDTVEC(dna), IDTVEC(fpusegm),
1320 IDTVEC(tss), IDTVEC(missing), IDTVEC(stk), IDTVEC(prot),
1321 IDTVEC(page), IDTVEC(mchk), IDTVEC(rsvd), IDTVEC(fpu), IDTVEC(align),
1322 IDTVEC(xmm), IDTVEC(dblfault),
1323 IDTVEC(fast_syscall), IDTVEC(fast_syscall32);
1325 #ifdef DEBUG_INTERRUPTS
1326 extern inthand_t *Xrsvdary[256];
1330 sdtossd(struct user_segment_descriptor *sd, struct soft_segment_descriptor *ssd)
1332 ssd->ssd_base = (sd->sd_hibase << 24) | sd->sd_lobase;
1333 ssd->ssd_limit = (sd->sd_hilimit << 16) | sd->sd_lolimit;
1334 ssd->ssd_type = sd->sd_type;
1335 ssd->ssd_dpl = sd->sd_dpl;
1336 ssd->ssd_p = sd->sd_p;
1337 ssd->ssd_def32 = sd->sd_def32;
1338 ssd->ssd_gran = sd->sd_gran;
1342 ssdtosd(struct soft_segment_descriptor *ssd, struct user_segment_descriptor *sd)
1345 sd->sd_lobase = (ssd->ssd_base) & 0xffffff;
1346 sd->sd_hibase = (ssd->ssd_base >> 24) & 0xff;
1347 sd->sd_lolimit = (ssd->ssd_limit) & 0xffff;
1348 sd->sd_hilimit = (ssd->ssd_limit >> 16) & 0xf;
1349 sd->sd_type = ssd->ssd_type;
1350 sd->sd_dpl = ssd->ssd_dpl;
1351 sd->sd_p = ssd->ssd_p;
1352 sd->sd_long = ssd->ssd_long;
1353 sd->sd_def32 = ssd->ssd_def32;
1354 sd->sd_gran = ssd->ssd_gran;
1358 ssdtosyssd(struct soft_segment_descriptor *ssd,
1359 struct system_segment_descriptor *sd)
1362 sd->sd_lobase = (ssd->ssd_base) & 0xffffff;
1363 sd->sd_hibase = (ssd->ssd_base >> 24) & 0xfffffffffful;
1364 sd->sd_lolimit = (ssd->ssd_limit) & 0xffff;
1365 sd->sd_hilimit = (ssd->ssd_limit >> 16) & 0xf;
1366 sd->sd_type = ssd->ssd_type;
1367 sd->sd_dpl = ssd->ssd_dpl;
1368 sd->sd_p = ssd->ssd_p;
1369 sd->sd_gran = ssd->ssd_gran;
1373 * Populate the (physmap) array with base/bound pairs describing the
1374 * available physical memory in the system, then test this memory and
1375 * build the phys_avail array describing the actually-available memory.
1377 * If we cannot accurately determine the physical memory map, then use
1378 * value from the 0xE801 call, and failing that, the RTC.
1380 * Total memory size may be set by the kernel environment variable
1381 * hw.physmem or the compile-time define MAXMEM.
1383 * Memory is aligned to PHYSMAP_ALIGN which must be a multiple
1384 * of PAGE_SIZE. This also greatly reduces the memory test time
1385 * which would otherwise be excessive on machines with > 8G of ram.
1387 * XXX first should be vm_paddr_t.
1390 #define PHYSMAP_ALIGN (vm_paddr_t)(128 * 1024)
1391 #define PHYSMAP_ALIGN_MASK (vm_paddr_t)(PHYSMAP_ALIGN - 1)
1394 getmemsize(caddr_t kmdp, u_int64_t first)
1396 int off, physmap_idx, pa_indx, da_indx;
1398 vm_paddr_t physmap[PHYSMAP_SIZE];
1400 vm_paddr_t msgbuf_size;
1401 u_long physmem_tunable;
1403 struct bios_smap *smapbase, *smap, *smapend;
1405 quad_t dcons_addr, dcons_size;
1407 bzero(physmap, sizeof(physmap));
1411 * get memory map from INT 15:E820, kindly supplied by the loader.
1413 * subr_module.c says:
1414 * "Consumer may safely assume that size value precedes data."
1415 * ie: an int32_t immediately precedes smap.
1417 smapbase = (struct bios_smap *)preload_search_info(kmdp,
1418 MODINFO_METADATA | MODINFOMD_SMAP);
1419 if (smapbase == NULL)
1420 panic("No BIOS smap info from loader!");
1422 smapsize = *((u_int32_t *)smapbase - 1);
1423 smapend = (struct bios_smap *)((uintptr_t)smapbase + smapsize);
1425 for (smap = smapbase; smap < smapend; smap++) {
1426 if (boothowto & RB_VERBOSE)
1427 kprintf("SMAP type=%02x base=%016lx len=%016lx\n",
1428 smap->type, smap->base, smap->length);
1430 if (smap->type != SMAP_TYPE_MEMORY)
1433 if (smap->length == 0)
1436 for (i = 0; i <= physmap_idx; i += 2) {
1437 if (smap->base < physmap[i + 1]) {
1438 if (boothowto & RB_VERBOSE) {
1439 kprintf("Overlapping or non-monotonic "
1440 "memory region, ignoring "
1446 if (i <= physmap_idx)
1449 Realmem += smap->length;
1451 if (smap->base == physmap[physmap_idx + 1]) {
1452 physmap[physmap_idx + 1] += smap->length;
1457 if (physmap_idx == PHYSMAP_SIZE) {
1458 kprintf("Too many segments in the physical "
1459 "address map, giving up\n");
1462 physmap[physmap_idx] = smap->base;
1463 physmap[physmap_idx + 1] = smap->base + smap->length;
1466 base_memory = physmap[1] / 1024;
1468 /* make hole for AP bootstrap code */
1469 physmap[1] = mp_bootaddress(base_memory);
1472 /* Save EBDA address, if any */
1473 ebda_addr = (u_long)(*(u_short *)(KERNBASE + 0x40e));
1477 * Maxmem isn't the "maximum memory", it's one larger than the
1478 * highest page of the physical address space. It should be
1479 * called something like "Maxphyspage". We may adjust this
1480 * based on ``hw.physmem'' and the results of the memory test.
1482 Maxmem = atop(physmap[physmap_idx + 1]);
1485 Maxmem = MAXMEM / 4;
1488 if (TUNABLE_ULONG_FETCH("hw.physmem", &physmem_tunable))
1489 Maxmem = atop(physmem_tunable);
1492 * Don't allow MAXMEM or hw.physmem to extend the amount of memory
1495 if (Maxmem > atop(physmap[physmap_idx + 1]))
1496 Maxmem = atop(physmap[physmap_idx + 1]);
1499 * Blowing out the DMAP will blow up the system.
1501 if (Maxmem > atop(DMAP_MAX_ADDRESS - DMAP_MIN_ADDRESS)) {
1502 kprintf("Limiting Maxmem due to DMAP size\n");
1503 Maxmem = atop(DMAP_MAX_ADDRESS - DMAP_MIN_ADDRESS);
1506 if (atop(physmap[physmap_idx + 1]) != Maxmem &&
1507 (boothowto & RB_VERBOSE)) {
1508 kprintf("Physical memory use set to %ldK\n", Maxmem * 4);
1512 * Call pmap initialization to make new kernel address space
1516 pmap_bootstrap(&first);
1517 physmap[0] = PAGE_SIZE;
1520 * Align the physmap to PHYSMAP_ALIGN and cut out anything
1523 for (i = j = 0; i <= physmap_idx; i += 2) {
1524 if (physmap[i+1] > ptoa((vm_paddr_t)Maxmem))
1525 physmap[i+1] = ptoa((vm_paddr_t)Maxmem);
1526 physmap[i] = (physmap[i] + PHYSMAP_ALIGN_MASK) &
1527 ~PHYSMAP_ALIGN_MASK;
1528 physmap[i+1] = physmap[i+1] & ~PHYSMAP_ALIGN_MASK;
1530 physmap[j] = physmap[i];
1531 physmap[j+1] = physmap[i+1];
1533 if (physmap[i] < physmap[i+1])
1536 physmap_idx = j - 2;
1539 * Align anything else used in the validation loop.
1541 first = (first + PHYSMAP_ALIGN_MASK) & ~PHYSMAP_ALIGN_MASK;
1544 * Size up each available chunk of physical memory.
1548 phys_avail[pa_indx++] = physmap[0];
1549 phys_avail[pa_indx] = physmap[0];
1550 dump_avail[da_indx] = physmap[0];
1554 * Get dcons buffer address
1556 if (kgetenv_quad("dcons.addr", &dcons_addr) == 0 ||
1557 kgetenv_quad("dcons.size", &dcons_size) == 0)
1561 * Validate the physical memory. The physical memory segments
1562 * have already been aligned to PHYSMAP_ALIGN which is a multiple
1565 for (i = 0; i <= physmap_idx; i += 2) {
1568 end = physmap[i + 1];
1570 for (pa = physmap[i]; pa < end; pa += PHYSMAP_ALIGN) {
1571 int tmp, page_bad, full;
1572 int *ptr = (int *)CADDR1;
1576 * block out kernel memory as not available.
1578 if (pa >= 0x200000 && pa < first)
1582 * block out dcons buffer
1585 && pa >= trunc_page(dcons_addr)
1586 && pa < dcons_addr + dcons_size) {
1593 * map page into kernel: valid, read/write,non-cacheable
1595 *pte = pa | PG_V | PG_RW | PG_N;
1600 * Test for alternating 1's and 0's
1602 *(volatile int *)ptr = 0xaaaaaaaa;
1604 if (*(volatile int *)ptr != 0xaaaaaaaa)
1607 * Test for alternating 0's and 1's
1609 *(volatile int *)ptr = 0x55555555;
1611 if (*(volatile int *)ptr != 0x55555555)
1616 *(volatile int *)ptr = 0xffffffff;
1618 if (*(volatile int *)ptr != 0xffffffff)
1623 *(volatile int *)ptr = 0x0;
1625 if (*(volatile int *)ptr != 0x0)
1628 * Restore original value.
1633 * Adjust array of valid/good pages.
1635 if (page_bad == TRUE)
1638 * If this good page is a continuation of the
1639 * previous set of good pages, then just increase
1640 * the end pointer. Otherwise start a new chunk.
1641 * Note that "end" points one higher than end,
1642 * making the range >= start and < end.
1643 * If we're also doing a speculative memory
1644 * test and we at or past the end, bump up Maxmem
1645 * so that we keep going. The first bad page
1646 * will terminate the loop.
1648 if (phys_avail[pa_indx] == pa) {
1649 phys_avail[pa_indx] += PHYSMAP_ALIGN;
1652 if (pa_indx == PHYS_AVAIL_ARRAY_END) {
1654 "Too many holes in the physical address space, giving up\n");
1659 phys_avail[pa_indx++] = pa;
1660 phys_avail[pa_indx] = pa + PHYSMAP_ALIGN;
1662 physmem += PHYSMAP_ALIGN / PAGE_SIZE;
1664 if (dump_avail[da_indx] == pa) {
1665 dump_avail[da_indx] += PHYSMAP_ALIGN;
1668 if (da_indx == DUMP_AVAIL_ARRAY_END) {
1672 dump_avail[da_indx++] = pa;
1673 dump_avail[da_indx] = pa + PHYSMAP_ALIGN;
1684 * The last chunk must contain at least one page plus the message
1685 * buffer to avoid complicating other code (message buffer address
1686 * calculation, etc.).
1688 msgbuf_size = (MSGBUF_SIZE + PHYSMAP_ALIGN_MASK) & ~PHYSMAP_ALIGN_MASK;
1690 while (phys_avail[pa_indx - 1] + PHYSMAP_ALIGN +
1691 msgbuf_size >= phys_avail[pa_indx]) {
1692 physmem -= atop(phys_avail[pa_indx] - phys_avail[pa_indx - 1]);
1693 phys_avail[pa_indx--] = 0;
1694 phys_avail[pa_indx--] = 0;
1697 Maxmem = atop(phys_avail[pa_indx]);
1699 /* Trim off space for the message buffer. */
1700 phys_avail[pa_indx] -= msgbuf_size;
1702 avail_end = phys_avail[pa_indx];
1704 /* Map the message buffer. */
1705 for (off = 0; off < msgbuf_size; off += PAGE_SIZE) {
1706 pmap_kenter((vm_offset_t)msgbufp + off,
1707 phys_avail[pa_indx] + off);
1711 struct machintr_abi MachIntrABI;
1722 * 7 Device Not Available (x87)
1724 * 9 Coprocessor Segment overrun (unsupported, reserved)
1726 * 11 Segment not present
1728 * 13 General Protection
1731 * 16 x87 FP Exception pending
1732 * 17 Alignment Check
1734 * 19 SIMD floating point
1736 * 32-255 INTn/external sources
1739 hammer_time(u_int64_t modulep, u_int64_t physfree)
1742 int gsel_tss, x, cpu;
1744 int metadata_missing, off;
1746 struct mdglobaldata *gd;
1750 * Prevent lowering of the ipl if we call tsleep() early.
1752 gd = &CPU_prvspace[0].mdglobaldata;
1753 bzero(gd, sizeof(*gd));
1756 * Note: on both UP and SMP curthread must be set non-NULL
1757 * early in the boot sequence because the system assumes
1758 * that 'curthread' is never NULL.
1761 gd->mi.gd_curthread = &thread0;
1762 thread0.td_gd = &gd->mi;
1764 atdevbase = ISA_HOLE_START + PTOV_OFFSET;
1767 metadata_missing = 0;
1768 if (bootinfo.bi_modulep) {
1769 preload_metadata = (caddr_t)bootinfo.bi_modulep + KERNBASE;
1770 preload_bootstrap_relocate(KERNBASE);
1772 metadata_missing = 1;
1774 if (bootinfo.bi_envp)
1775 kern_envp = (caddr_t)bootinfo.bi_envp + KERNBASE;
1778 preload_metadata = (caddr_t)(uintptr_t)(modulep + PTOV_OFFSET);
1779 preload_bootstrap_relocate(PTOV_OFFSET);
1780 kmdp = preload_search_by_type("elf kernel");
1782 kmdp = preload_search_by_type("elf64 kernel");
1783 boothowto = MD_FETCH(kmdp, MODINFOMD_HOWTO, int);
1784 kern_envp = MD_FETCH(kmdp, MODINFOMD_ENVP, char *) + PTOV_OFFSET;
1786 ksym_start = MD_FETCH(kmdp, MODINFOMD_SSYM, uintptr_t);
1787 ksym_end = MD_FETCH(kmdp, MODINFOMD_ESYM, uintptr_t);
1790 if (boothowto & RB_VERBOSE)
1794 * Default MachIntrABI to ICU
1796 MachIntrABI = MachIntrABI_ICU;
1799 * start with one cpu. Note: with one cpu, ncpus2_shift, ncpus2_mask,
1800 * and ncpus_fit_mask remain 0.
1805 /* Init basic tunables, hz etc */
1809 * make gdt memory segments
1811 gdt_segs[GPROC0_SEL].ssd_base =
1812 (uintptr_t) &CPU_prvspace[0].mdglobaldata.gd_common_tss;
1814 gd->mi.gd_prvspace = &CPU_prvspace[0];
1816 for (x = 0; x < NGDT; x++) {
1817 if (x != GPROC0_SEL && x != (GPROC0_SEL + 1))
1818 ssdtosd(&gdt_segs[x], &gdt[x]);
1820 ssdtosyssd(&gdt_segs[GPROC0_SEL],
1821 (struct system_segment_descriptor *)&gdt[GPROC0_SEL]);
1823 r_gdt.rd_limit = NGDT * sizeof(gdt[0]) - 1;
1824 r_gdt.rd_base = (long) gdt;
1827 wrmsr(MSR_FSBASE, 0); /* User value */
1828 wrmsr(MSR_GSBASE, (u_int64_t)&gd->mi);
1829 wrmsr(MSR_KGSBASE, 0); /* User value while in the kernel */
1831 mi_gdinit(&gd->mi, 0);
1833 proc0paddr = proc0paddr_buff;
1834 mi_proc0init(&gd->mi, proc0paddr);
1835 safepri = TDPRI_MAX;
1837 /* spinlocks and the BGL */
1841 for (x = 0; x < NIDT; x++)
1842 setidt_global(x, &IDTVEC(rsvd), SDT_SYSIGT, SEL_KPL, 0);
1843 setidt_global(IDT_DE, &IDTVEC(div), SDT_SYSIGT, SEL_KPL, 0);
1844 setidt_global(IDT_DB, &IDTVEC(dbg), SDT_SYSIGT, SEL_KPL, 0);
1845 setidt_global(IDT_NMI, &IDTVEC(nmi), SDT_SYSIGT, SEL_KPL, 1);
1846 setidt_global(IDT_BP, &IDTVEC(bpt), SDT_SYSIGT, SEL_UPL, 0);
1847 setidt_global(IDT_OF, &IDTVEC(ofl), SDT_SYSIGT, SEL_KPL, 0);
1848 setidt_global(IDT_BR, &IDTVEC(bnd), SDT_SYSIGT, SEL_KPL, 0);
1849 setidt_global(IDT_UD, &IDTVEC(ill), SDT_SYSIGT, SEL_KPL, 0);
1850 setidt_global(IDT_NM, &IDTVEC(dna), SDT_SYSIGT, SEL_KPL, 0);
1851 setidt_global(IDT_DF, &IDTVEC(dblfault), SDT_SYSIGT, SEL_KPL, 1);
1852 setidt_global(IDT_FPUGP, &IDTVEC(fpusegm), SDT_SYSIGT, SEL_KPL, 0);
1853 setidt_global(IDT_TS, &IDTVEC(tss), SDT_SYSIGT, SEL_KPL, 0);
1854 setidt_global(IDT_NP, &IDTVEC(missing), SDT_SYSIGT, SEL_KPL, 0);
1855 setidt_global(IDT_SS, &IDTVEC(stk), SDT_SYSIGT, SEL_KPL, 0);
1856 setidt_global(IDT_GP, &IDTVEC(prot), SDT_SYSIGT, SEL_KPL, 0);
1857 setidt_global(IDT_PF, &IDTVEC(page), SDT_SYSIGT, SEL_KPL, 0);
1858 setidt_global(IDT_MF, &IDTVEC(fpu), SDT_SYSIGT, SEL_KPL, 0);
1859 setidt_global(IDT_AC, &IDTVEC(align), SDT_SYSIGT, SEL_KPL, 0);
1860 setidt_global(IDT_MC, &IDTVEC(mchk), SDT_SYSIGT, SEL_KPL, 0);
1861 setidt_global(IDT_XF, &IDTVEC(xmm), SDT_SYSIGT, SEL_KPL, 0);
1863 for (cpu = 0; cpu < MAXCPU; ++cpu) {
1864 r_idt_arr[cpu].rd_limit = sizeof(idt_arr[cpu]) - 1;
1865 r_idt_arr[cpu].rd_base = (long) &idt_arr[cpu][0];
1868 lidt(&r_idt_arr[0]);
1871 * Initialize the console before we print anything out.
1876 if (metadata_missing)
1877 kprintf("WARNING: loader(8) metadata is missing!\n");
1887 * Initialize IRQ mapping
1890 * SHOULD be after elcr_probe()
1892 MachIntrABI_ICU.initmap();
1893 MachIntrABI_IOAPIC.initmap();
1897 if (boothowto & RB_KDB)
1898 Debugger("Boot flags requested debugger");
1902 finishidentcpu(); /* Final stage of CPU initialization */
1903 setidt(6, &IDTVEC(ill), SDT_SYS386IGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1904 setidt(13, &IDTVEC(prot), SDT_SYS386IGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1906 identify_cpu(); /* Final stage of CPU initialization */
1907 initializecpu(); /* Initialize CPU registers */
1909 TUNABLE_INT_FETCH("hw.apic_io_enable", &ioapic_enable); /* for compat */
1910 TUNABLE_INT_FETCH("hw.ioapic_enable", &ioapic_enable);
1911 TUNABLE_INT_FETCH("hw.lapic_enable", &lapic_enable);
1914 * Some of the virtaul machines do not work w/ I/O APIC
1915 * enabled. If the user does not explicitly enable or
1916 * disable the I/O APIC (ioapic_enable < 0), then we
1917 * disable I/O APIC on all virtual machines.
1920 * This must be done after identify_cpu(), which sets
1923 if (ioapic_enable < 0) {
1924 if (cpu_feature2 & CPUID2_VMM)
1930 /* make an initial tss so cpu can get interrupt stack on syscall! */
1931 gd->gd_common_tss.tss_rsp0 =
1932 (register_t)(thread0.td_kstack +
1933 KSTACK_PAGES * PAGE_SIZE - sizeof(struct pcb));
1934 /* Ensure the stack is aligned to 16 bytes */
1935 gd->gd_common_tss.tss_rsp0 &= ~(register_t)0xF;
1937 /* double fault stack */
1938 gd->gd_common_tss.tss_ist1 =
1939 (long)&gd->mi.gd_prvspace->idlestack[
1940 sizeof(gd->mi.gd_prvspace->idlestack)];
1942 /* Set the IO permission bitmap (empty due to tss seg limit) */
1943 gd->gd_common_tss.tss_iobase = sizeof(struct x86_64tss);
1945 gsel_tss = GSEL(GPROC0_SEL, SEL_KPL);
1946 gd->gd_tss_gdt = &gdt[GPROC0_SEL];
1947 gd->gd_common_tssd = *gd->gd_tss_gdt;
1950 /* Set up the fast syscall stuff */
1951 msr = rdmsr(MSR_EFER) | EFER_SCE;
1952 wrmsr(MSR_EFER, msr);
1953 wrmsr(MSR_LSTAR, (u_int64_t)IDTVEC(fast_syscall));
1954 wrmsr(MSR_CSTAR, (u_int64_t)IDTVEC(fast_syscall32));
1955 msr = ((u_int64_t)GSEL(GCODE_SEL, SEL_KPL) << 32) |
1956 ((u_int64_t)GSEL(GUCODE32_SEL, SEL_UPL) << 48);
1957 wrmsr(MSR_STAR, msr);
1958 wrmsr(MSR_SF_MASK, PSL_NT|PSL_T|PSL_I|PSL_C|PSL_D|PSL_IOPL);
1960 getmemsize(kmdp, physfree);
1961 init_param2(physmem);
1963 /* now running on new page tables, configured,and u/iom is accessible */
1965 /* Map the message buffer. */
1967 for (off = 0; off < round_page(MSGBUF_SIZE); off += PAGE_SIZE)
1968 pmap_kenter((vm_offset_t)msgbufp + off, avail_end + off);
1971 msgbufinit(msgbufp, MSGBUF_SIZE);
1974 /* transfer to user mode */
1976 _ucodesel = GSEL(GUCODE_SEL, SEL_UPL);
1977 _udatasel = GSEL(GUDATA_SEL, SEL_UPL);
1978 _ucode32sel = GSEL(GUCODE32_SEL, SEL_UPL);
1984 /* setup proc 0's pcb */
1985 thread0.td_pcb->pcb_flags = 0;
1986 thread0.td_pcb->pcb_cr3 = KPML4phys;
1987 thread0.td_pcb->pcb_ext = 0;
1988 lwp0.lwp_md.md_regs = &proc0_tf; /* XXX needed? */
1990 /* Location of kernel stack for locore */
1991 return ((u_int64_t)thread0.td_pcb);
1995 * Initialize machine-dependant portions of the global data structure.
1996 * Note that the global data area and cpu0's idlestack in the private
1997 * data space were allocated in locore.
1999 * Note: the idlethread's cpl is 0
2001 * WARNING! Called from early boot, 'mycpu' may not work yet.
2004 cpu_gdinit(struct mdglobaldata *gd, int cpu)
2007 gd->mi.gd_curthread = &gd->mi.gd_idlethread;
2009 lwkt_init_thread(&gd->mi.gd_idlethread,
2010 gd->mi.gd_prvspace->idlestack,
2011 sizeof(gd->mi.gd_prvspace->idlestack),
2013 lwkt_set_comm(&gd->mi.gd_idlethread, "idle_%d", cpu);
2014 gd->mi.gd_idlethread.td_switch = cpu_lwkt_switch;
2015 gd->mi.gd_idlethread.td_sp -= sizeof(void *);
2016 *(void **)gd->mi.gd_idlethread.td_sp = cpu_idle_restore;
2020 is_globaldata_space(vm_offset_t saddr, vm_offset_t eaddr)
2022 if (saddr >= (vm_offset_t)&CPU_prvspace[0] &&
2023 eaddr <= (vm_offset_t)&CPU_prvspace[MAXCPU]) {
2026 if (saddr >= DMAP_MIN_ADDRESS && eaddr <= DMAP_MAX_ADDRESS)
2032 globaldata_find(int cpu)
2034 KKASSERT(cpu >= 0 && cpu < ncpus);
2035 return(&CPU_prvspace[cpu].mdglobaldata.mi);
2039 ptrace_set_pc(struct lwp *lp, unsigned long addr)
2041 lp->lwp_md.md_regs->tf_rip = addr;
2046 ptrace_single_step(struct lwp *lp)
2048 lp->lwp_md.md_regs->tf_rflags |= PSL_T;
2053 fill_regs(struct lwp *lp, struct reg *regs)
2055 struct trapframe *tp;
2057 if ((tp = lp->lwp_md.md_regs) == NULL)
2059 bcopy(&tp->tf_rdi, ®s->r_rdi, sizeof(*regs));
2064 set_regs(struct lwp *lp, struct reg *regs)
2066 struct trapframe *tp;
2068 tp = lp->lwp_md.md_regs;
2069 if (!EFL_SECURE(regs->r_rflags, tp->tf_rflags) ||
2070 !CS_SECURE(regs->r_cs))
2072 bcopy(®s->r_rdi, &tp->tf_rdi, sizeof(*regs));
2077 #ifndef CPU_DISABLE_SSE
2079 fill_fpregs_xmm(struct savexmm *sv_xmm, struct save87 *sv_87)
2081 struct env87 *penv_87 = &sv_87->sv_env;
2082 struct envxmm *penv_xmm = &sv_xmm->sv_env;
2085 /* FPU control/status */
2086 penv_87->en_cw = penv_xmm->en_cw;
2087 penv_87->en_sw = penv_xmm->en_sw;
2088 penv_87->en_tw = penv_xmm->en_tw;
2089 penv_87->en_fip = penv_xmm->en_fip;
2090 penv_87->en_fcs = penv_xmm->en_fcs;
2091 penv_87->en_opcode = penv_xmm->en_opcode;
2092 penv_87->en_foo = penv_xmm->en_foo;
2093 penv_87->en_fos = penv_xmm->en_fos;
2096 for (i = 0; i < 8; ++i)
2097 sv_87->sv_ac[i] = sv_xmm->sv_fp[i].fp_acc;
2101 set_fpregs_xmm(struct save87 *sv_87, struct savexmm *sv_xmm)
2103 struct env87 *penv_87 = &sv_87->sv_env;
2104 struct envxmm *penv_xmm = &sv_xmm->sv_env;
2107 /* FPU control/status */
2108 penv_xmm->en_cw = penv_87->en_cw;
2109 penv_xmm->en_sw = penv_87->en_sw;
2110 penv_xmm->en_tw = penv_87->en_tw;
2111 penv_xmm->en_fip = penv_87->en_fip;
2112 penv_xmm->en_fcs = penv_87->en_fcs;
2113 penv_xmm->en_opcode = penv_87->en_opcode;
2114 penv_xmm->en_foo = penv_87->en_foo;
2115 penv_xmm->en_fos = penv_87->en_fos;
2118 for (i = 0; i < 8; ++i)
2119 sv_xmm->sv_fp[i].fp_acc = sv_87->sv_ac[i];
2121 #endif /* CPU_DISABLE_SSE */
2124 fill_fpregs(struct lwp *lp, struct fpreg *fpregs)
2126 if (lp->lwp_thread == NULL || lp->lwp_thread->td_pcb == NULL)
2128 #ifndef CPU_DISABLE_SSE
2130 fill_fpregs_xmm(&lp->lwp_thread->td_pcb->pcb_save.sv_xmm,
2131 (struct save87 *)fpregs);
2134 #endif /* CPU_DISABLE_SSE */
2135 bcopy(&lp->lwp_thread->td_pcb->pcb_save.sv_87, fpregs, sizeof *fpregs);
2140 set_fpregs(struct lwp *lp, struct fpreg *fpregs)
2142 #ifndef CPU_DISABLE_SSE
2144 set_fpregs_xmm((struct save87 *)fpregs,
2145 &lp->lwp_thread->td_pcb->pcb_save.sv_xmm);
2148 #endif /* CPU_DISABLE_SSE */
2149 bcopy(fpregs, &lp->lwp_thread->td_pcb->pcb_save.sv_87, sizeof *fpregs);
2154 fill_dbregs(struct lwp *lp, struct dbreg *dbregs)
2159 dbregs->dr[0] = rdr0();
2160 dbregs->dr[1] = rdr1();
2161 dbregs->dr[2] = rdr2();
2162 dbregs->dr[3] = rdr3();
2163 dbregs->dr[4] = rdr4();
2164 dbregs->dr[5] = rdr5();
2165 dbregs->dr[6] = rdr6();
2166 dbregs->dr[7] = rdr7();
2169 if (lp->lwp_thread == NULL || (pcb = lp->lwp_thread->td_pcb) == NULL)
2171 dbregs->dr[0] = pcb->pcb_dr0;
2172 dbregs->dr[1] = pcb->pcb_dr1;
2173 dbregs->dr[2] = pcb->pcb_dr2;
2174 dbregs->dr[3] = pcb->pcb_dr3;
2177 dbregs->dr[6] = pcb->pcb_dr6;
2178 dbregs->dr[7] = pcb->pcb_dr7;
2183 set_dbregs(struct lwp *lp, struct dbreg *dbregs)
2186 load_dr0(dbregs->dr[0]);
2187 load_dr1(dbregs->dr[1]);
2188 load_dr2(dbregs->dr[2]);
2189 load_dr3(dbregs->dr[3]);
2190 load_dr4(dbregs->dr[4]);
2191 load_dr5(dbregs->dr[5]);
2192 load_dr6(dbregs->dr[6]);
2193 load_dr7(dbregs->dr[7]);
2196 struct ucred *ucred;
2198 uint64_t mask1, mask2;
2201 * Don't let an illegal value for dr7 get set. Specifically,
2202 * check for undefined settings. Setting these bit patterns
2203 * result in undefined behaviour and can lead to an unexpected
2206 /* JG this loop looks unreadable */
2207 /* Check 4 2-bit fields for invalid patterns.
2208 * These fields are R/Wi, for i = 0..3
2210 /* Is 10 in LENi allowed when running in compatibility mode? */
2211 /* Pattern 10 in R/Wi might be used to indicate
2212 * breakpoint on I/O. Further analysis should be
2213 * carried to decide if it is safe and useful to
2214 * provide access to that capability
2216 for (i = 0, mask1 = 0x3<<16, mask2 = 0x2<<16; i < 4;
2217 i++, mask1 <<= 4, mask2 <<= 4)
2218 if ((dbregs->dr[7] & mask1) == mask2)
2221 pcb = lp->lwp_thread->td_pcb;
2222 ucred = lp->lwp_proc->p_ucred;
2225 * Don't let a process set a breakpoint that is not within the
2226 * process's address space. If a process could do this, it
2227 * could halt the system by setting a breakpoint in the kernel
2228 * (if ddb was enabled). Thus, we need to check to make sure
2229 * that no breakpoints are being enabled for addresses outside
2230 * process's address space, unless, perhaps, we were called by
2233 * XXX - what about when the watched area of the user's
2234 * address space is written into from within the kernel
2235 * ... wouldn't that still cause a breakpoint to be generated
2236 * from within kernel mode?
2239 if (priv_check_cred(ucred, PRIV_ROOT, 0) != 0) {
2240 if (dbregs->dr[7] & 0x3) {
2241 /* dr0 is enabled */
2242 if (dbregs->dr[0] >= VM_MAX_USER_ADDRESS)
2246 if (dbregs->dr[7] & (0x3<<2)) {
2247 /* dr1 is enabled */
2248 if (dbregs->dr[1] >= VM_MAX_USER_ADDRESS)
2252 if (dbregs->dr[7] & (0x3<<4)) {
2253 /* dr2 is enabled */
2254 if (dbregs->dr[2] >= VM_MAX_USER_ADDRESS)
2258 if (dbregs->dr[7] & (0x3<<6)) {
2259 /* dr3 is enabled */
2260 if (dbregs->dr[3] >= VM_MAX_USER_ADDRESS)
2265 pcb->pcb_dr0 = dbregs->dr[0];
2266 pcb->pcb_dr1 = dbregs->dr[1];
2267 pcb->pcb_dr2 = dbregs->dr[2];
2268 pcb->pcb_dr3 = dbregs->dr[3];
2269 pcb->pcb_dr6 = dbregs->dr[6];
2270 pcb->pcb_dr7 = dbregs->dr[7];
2272 pcb->pcb_flags |= PCB_DBREGS;
2279 * Return > 0 if a hardware breakpoint has been hit, and the
2280 * breakpoint was in user space. Return 0, otherwise.
2283 user_dbreg_trap(void)
2285 u_int64_t dr7, dr6; /* debug registers dr6 and dr7 */
2286 u_int64_t bp; /* breakpoint bits extracted from dr6 */
2287 int nbp; /* number of breakpoints that triggered */
2288 caddr_t addr[4]; /* breakpoint addresses */
2292 if ((dr7 & 0xff) == 0) {
2294 * all GE and LE bits in the dr7 register are zero,
2295 * thus the trap couldn't have been caused by the
2296 * hardware debug registers
2307 * None of the breakpoint bits are set meaning this
2308 * trap was not caused by any of the debug registers
2314 * at least one of the breakpoints were hit, check to see
2315 * which ones and if any of them are user space addresses
2319 addr[nbp++] = (caddr_t)rdr0();
2322 addr[nbp++] = (caddr_t)rdr1();
2325 addr[nbp++] = (caddr_t)rdr2();
2328 addr[nbp++] = (caddr_t)rdr3();
2331 for (i=0; i<nbp; i++) {
2333 (caddr_t)VM_MAX_USER_ADDRESS) {
2335 * addr[i] is in user space
2342 * None of the breakpoints are in user space.
2350 Debugger(const char *msg)
2352 kprintf("Debugger(\"%s\") called.\n", msg);
2359 * Provide inb() and outb() as functions. They are normally only
2360 * available as macros calling inlined functions, thus cannot be
2361 * called inside DDB.
2363 * The actual code is stolen from <machine/cpufunc.h>, and de-inlined.
2369 /* silence compiler warnings */
2371 void outb(u_int, u_char);
2378 * We use %%dx and not %1 here because i/o is done at %dx and not at
2379 * %edx, while gcc generates inferior code (movw instead of movl)
2380 * if we tell it to load (u_short) port.
2382 __asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port));
2387 outb(u_int port, u_char data)
2391 * Use an unnecessary assignment to help gcc's register allocator.
2392 * This make a large difference for gcc-1.40 and a tiny difference
2393 * for gcc-2.6.0. For gcc-1.40, al had to be ``asm("ax")'' for
2394 * best results. gcc-2.6.0 can't handle this.
2397 __asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port));
2404 #include "opt_cpu.h"
2408 * initialize all the SMP locks
2411 /* critical region when masking or unmasking interupts */
2412 struct spinlock_deprecated imen_spinlock;
2414 /* critical region for old style disable_intr/enable_intr */
2415 struct spinlock_deprecated mpintr_spinlock;
2417 /* critical region around INTR() routines */
2418 struct spinlock_deprecated intr_spinlock;
2420 /* lock region used by kernel profiling */
2421 struct spinlock_deprecated mcount_spinlock;
2423 /* locks com (tty) data/hardware accesses: a FASTINTR() */
2424 struct spinlock_deprecated com_spinlock;
2426 /* lock regions around the clock hardware */
2427 struct spinlock_deprecated clock_spinlock;
2434 * Get the initial mplock with a count of 1 for the BSP.
2435 * This uses a LOGICAL cpu ID, ie BSP == 0.
2437 cpu_get_initial_mplock();
2440 spin_lock_init(&mcount_spinlock);
2441 spin_lock_init(&intr_spinlock);
2442 spin_lock_init(&mpintr_spinlock);
2443 spin_lock_init(&imen_spinlock);
2444 spin_lock_init(&com_spinlock);
2445 spin_lock_init(&clock_spinlock);
2447 /* our token pool needs to work early */
2448 lwkt_token_pool_init();