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_atalk.h"
46 #include "opt_compat.h"
49 #include "opt_directio.h"
52 #include "opt_msgbuf.h"
56 #include <sys/param.h>
57 #include <sys/systm.h>
58 #include <sys/sysproto.h>
59 #include <sys/signalvar.h>
60 #include <sys/kernel.h>
61 #include <sys/linker.h>
62 #include <sys/malloc.h>
66 #include <sys/reboot.h>
68 #include <sys/msgbuf.h>
69 #include <sys/sysent.h>
70 #include <sys/sysctl.h>
71 #include <sys/vmmeter.h>
73 #include <sys/upcall.h>
74 #include <sys/usched.h>
78 #include <vm/vm_param.h>
80 #include <vm/vm_kern.h>
81 #include <vm/vm_object.h>
82 #include <vm/vm_page.h>
83 #include <vm/vm_map.h>
84 #include <vm/vm_pager.h>
85 #include <vm/vm_extern.h>
87 #include <sys/thread2.h>
88 #include <sys/mplock2.h>
96 #include <machine/cpu.h>
97 #include <machine/clock.h>
98 #include <machine/specialreg.h>
100 #include <machine/bootinfo.h>
102 #include <machine/md_var.h>
103 #include <machine/metadata.h>
104 #include <machine/pc/bios.h>
105 #include <machine/pcb_ext.h> /* pcb.h included via sys/user.h */
106 #include <machine/globaldata.h> /* CPU_prvspace */
107 #include <machine/smp.h>
109 #include <machine/perfmon.h>
111 #include <machine/cputypes.h>
112 #include <machine/intr_machdep.h>
115 #include <bus/isa/isa_device.h>
117 #include <machine_base/isa/isa_intr.h>
118 #include <machine_base/isa/elcr_var.h>
119 #include <bus/isa/rtc.h>
120 #include <sys/random.h>
121 #include <sys/ptrace.h>
122 #include <machine/sigframe.h>
124 #include <sys/machintr.h>
125 #include <machine_base/icu/icu_abi.h>
126 #include <machine_base/apic/ioapic_abi.h>
128 #define PHYSMAP_ENTRIES 10
130 extern u_int64_t hammer_time(u_int64_t, u_int64_t);
132 extern void printcpuinfo(void); /* XXX header file */
133 extern void identify_cpu(void);
135 extern void finishidentcpu(void);
137 extern void panicifcpuunsupported(void);
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 struct privatespace CPU_prvspace[MAXCPU] __aligned(4096); /* XXX */
157 int _udatasel, _ucodesel, _ucode32sel;
160 int64_t tsc_offsets[MAXCPU];
162 int64_t tsc_offsets[1];
165 #if defined(SWTCH_OPTIM_STATS)
166 extern int swtch_optim_stats;
167 SYSCTL_INT(_debug, OID_AUTO, swtch_optim_stats,
168 CTLFLAG_RD, &swtch_optim_stats, 0, "");
169 SYSCTL_INT(_debug, OID_AUTO, tlb_flush_count,
170 CTLFLAG_RD, &tlb_flush_count, 0, "");
175 u_long ebda_addr = 0;
178 sysctl_hw_physmem(SYSCTL_HANDLER_ARGS)
180 u_long pmem = ctob(physmem);
182 int error = sysctl_handle_long(oidp, &pmem, 0, req);
186 SYSCTL_PROC(_hw, HW_PHYSMEM, physmem, CTLTYPE_ULONG|CTLFLAG_RD,
187 0, 0, sysctl_hw_physmem, "LU", "Total system memory in bytes (number of pages * page size)");
190 sysctl_hw_usermem(SYSCTL_HANDLER_ARGS)
192 int error = sysctl_handle_int(oidp, 0,
193 ctob(physmem - vmstats.v_wire_count), req);
197 SYSCTL_PROC(_hw, HW_USERMEM, usermem, CTLTYPE_INT|CTLFLAG_RD,
198 0, 0, sysctl_hw_usermem, "IU", "");
201 sysctl_hw_availpages(SYSCTL_HANDLER_ARGS)
203 int error = sysctl_handle_int(oidp, 0,
204 x86_64_btop(avail_end - avail_start), req);
208 SYSCTL_PROC(_hw, OID_AUTO, availpages, CTLTYPE_INT|CTLFLAG_RD,
209 0, 0, sysctl_hw_availpages, "I", "");
215 * The number of PHYSMAP entries must be one less than the number of
216 * PHYSSEG entries because the PHYSMAP entry that spans the largest
217 * physical address that is accessible by ISA DMA is split into two
220 #define PHYSMAP_SIZE (2 * (VM_PHYSSEG_MAX - 1))
222 vm_paddr_t phys_avail[PHYSMAP_SIZE + 2];
223 vm_paddr_t dump_avail[PHYSMAP_SIZE + 2];
225 /* must be 2 less so 0 0 can signal end of chunks */
226 #define PHYS_AVAIL_ARRAY_END (NELEM(phys_avail) - 2)
227 #define DUMP_AVAIL_ARRAY_END (NELEM(dump_avail) - 2)
229 static vm_offset_t buffer_sva, buffer_eva;
230 vm_offset_t clean_sva, clean_eva;
231 static vm_offset_t pager_sva, pager_eva;
232 static struct trapframe proc0_tf;
235 cpu_startup(void *dummy)
239 vm_offset_t firstaddr;
242 * Good {morning,afternoon,evening,night}.
244 kprintf("%s", version);
247 panicifcpuunsupported();
251 kprintf("real memory = %ju (%ju MB)\n",
253 (intmax_t)Realmem / 1024 / 1024);
255 * Display any holes after the first chunk of extended memory.
260 kprintf("Physical memory chunk(s):\n");
261 for (indx = 0; phys_avail[indx + 1] != 0; indx += 2) {
262 vm_paddr_t size1 = phys_avail[indx + 1] - phys_avail[indx];
264 kprintf("0x%08jx - 0x%08jx, %ju bytes (%ju pages)\n",
265 (intmax_t)phys_avail[indx],
266 (intmax_t)phys_avail[indx + 1] - 1,
268 (intmax_t)(size1 / PAGE_SIZE));
273 * Allocate space for system data structures.
274 * The first available kernel virtual address is in "v".
275 * As pages of kernel virtual memory are allocated, "v" is incremented.
276 * As pages of memory are allocated and cleared,
277 * "firstaddr" is incremented.
278 * An index into the kernel page table corresponding to the
279 * virtual memory address maintained in "v" is kept in "mapaddr".
283 * Make two passes. The first pass calculates how much memory is
284 * needed and allocates it. The second pass assigns virtual
285 * addresses to the various data structures.
289 v = (caddr_t)firstaddr;
291 #define valloc(name, type, num) \
292 (name) = (type *)v; v = (caddr_t)((name)+(num))
293 #define valloclim(name, type, num, lim) \
294 (name) = (type *)v; v = (caddr_t)((lim) = ((name)+(num)))
297 * The nominal buffer size (and minimum KVA allocation) is BKVASIZE.
298 * For the first 64MB of ram nominally allocate sufficient buffers to
299 * cover 1/4 of our ram. Beyond the first 64MB allocate additional
300 * buffers to cover 1/20 of our ram over 64MB. When auto-sizing
301 * the buffer cache we limit the eventual kva reservation to
304 * factor represents the 1/4 x ram conversion.
307 int factor = 4 * BKVASIZE / 1024;
308 int kbytes = physmem * (PAGE_SIZE / 1024);
312 nbuf += min((kbytes - 4096) / factor, 65536 / factor);
314 nbuf += (kbytes - 65536) * 2 / (factor * 5);
315 if (maxbcache && nbuf > maxbcache / BKVASIZE)
316 nbuf = maxbcache / BKVASIZE;
320 * Do not allow the buffer_map to be more then 1/2 the size of the
323 if (nbuf > (virtual_end - virtual_start) / (BKVASIZE * 2)) {
324 nbuf = (virtual_end - virtual_start) / (BKVASIZE * 2);
325 kprintf("Warning: nbufs capped at %d\n", nbuf);
328 nswbuf = max(min(nbuf/4, 256), 16);
330 if (nswbuf < NSWBUF_MIN)
337 valloc(swbuf, struct buf, nswbuf);
338 valloc(buf, struct buf, nbuf);
341 * End of first pass, size has been calculated so allocate memory
343 if (firstaddr == 0) {
344 size = (vm_size_t)(v - firstaddr);
345 firstaddr = kmem_alloc(&kernel_map, round_page(size));
347 panic("startup: no room for tables");
352 * End of second pass, addresses have been assigned
354 if ((vm_size_t)(v - firstaddr) != size)
355 panic("startup: table size inconsistency");
357 kmem_suballoc(&kernel_map, &clean_map, &clean_sva, &clean_eva,
358 (nbuf*BKVASIZE) + (nswbuf*MAXPHYS) + pager_map_size);
359 kmem_suballoc(&clean_map, &buffer_map, &buffer_sva, &buffer_eva,
361 buffer_map.system_map = 1;
362 kmem_suballoc(&clean_map, &pager_map, &pager_sva, &pager_eva,
363 (nswbuf*MAXPHYS) + pager_map_size);
364 pager_map.system_map = 1;
366 #if defined(USERCONFIG)
368 cninit(); /* the preferred console may have changed */
371 kprintf("avail memory = %ju (%ju MB)\n",
372 (uintmax_t)ptoa(vmstats.v_free_count),
373 (uintmax_t)ptoa(vmstats.v_free_count) / 1024 / 1024);
376 * Set up buffers, so they can be used to read disk labels.
379 vm_pager_bufferinit();
381 /* Log ELCR information */
386 * OK, enough kmem_alloc/malloc state should be up, lets get on with it!
388 mp_start(); /* fire up the APs and APICs */
391 MachIntrABI.finalize();
397 * Send an interrupt to process.
399 * Stack is set up to allow sigcode stored
400 * at top to call routine, followed by kcall
401 * to sigreturn routine below. After sigreturn
402 * resets the signal mask, the stack, and the
403 * frame pointer, it returns to the user
407 sendsig(sig_t catcher, int sig, sigset_t *mask, u_long code)
409 struct lwp *lp = curthread->td_lwp;
410 struct proc *p = lp->lwp_proc;
411 struct trapframe *regs;
412 struct sigacts *psp = p->p_sigacts;
413 struct sigframe sf, *sfp;
417 regs = lp->lwp_md.md_regs;
418 oonstack = (lp->lwp_sigstk.ss_flags & SS_ONSTACK) ? 1 : 0;
420 /* Save user context */
421 bzero(&sf, sizeof(struct sigframe));
422 sf.sf_uc.uc_sigmask = *mask;
423 sf.sf_uc.uc_stack = lp->lwp_sigstk;
424 sf.sf_uc.uc_mcontext.mc_onstack = oonstack;
425 KKASSERT(__offsetof(struct trapframe, tf_rdi) == 0);
426 bcopy(regs, &sf.sf_uc.uc_mcontext.mc_rdi, sizeof(struct trapframe));
428 /* Make the size of the saved context visible to userland */
429 sf.sf_uc.uc_mcontext.mc_len = sizeof(sf.sf_uc.uc_mcontext);
431 /* Save mailbox pending state for syscall interlock semantics */
432 if (p->p_flag & P_MAILBOX)
433 sf.sf_uc.uc_mcontext.mc_xflags |= PGEX_MAILBOX;
435 /* Allocate and validate space for the signal handler context. */
436 if ((lp->lwp_flag & LWP_ALTSTACK) != 0 && !oonstack &&
437 SIGISMEMBER(psp->ps_sigonstack, sig)) {
438 sp = (char *)(lp->lwp_sigstk.ss_sp + lp->lwp_sigstk.ss_size -
439 sizeof(struct sigframe));
440 lp->lwp_sigstk.ss_flags |= SS_ONSTACK;
442 /* We take red zone into account */
443 sp = (char *)regs->tf_rsp - sizeof(struct sigframe) - 128;
446 /* Align to 16 bytes */
447 sfp = (struct sigframe *)((intptr_t)sp & ~(intptr_t)0xF);
449 /* Translate the signal is appropriate */
450 if (p->p_sysent->sv_sigtbl) {
451 if (sig <= p->p_sysent->sv_sigsize)
452 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)];
456 * Build the argument list for the signal handler.
458 * Arguments are in registers (%rdi, %rsi, %rdx, %rcx)
460 regs->tf_rdi = sig; /* argument 1 */
461 regs->tf_rdx = (register_t)&sfp->sf_uc; /* argument 3 */
463 if (SIGISMEMBER(psp->ps_siginfo, sig)) {
465 * Signal handler installed with SA_SIGINFO.
467 * action(signo, siginfo, ucontext)
469 regs->tf_rsi = (register_t)&sfp->sf_si; /* argument 2 */
470 regs->tf_rcx = (register_t)regs->tf_addr; /* argument 4 */
471 sf.sf_ahu.sf_action = (__siginfohandler_t *)catcher;
473 /* fill siginfo structure */
474 sf.sf_si.si_signo = sig;
475 sf.sf_si.si_code = code;
476 sf.sf_si.si_addr = (void *)regs->tf_addr;
479 * Old FreeBSD-style arguments.
481 * handler (signo, code, [uc], addr)
483 regs->tf_rsi = (register_t)code; /* argument 2 */
484 regs->tf_rcx = (register_t)regs->tf_addr; /* argument 4 */
485 sf.sf_ahu.sf_handler = catcher;
489 * If we're a vm86 process, we want to save the segment registers.
490 * We also change eflags to be our emulated eflags, not the actual
494 if (regs->tf_eflags & PSL_VM) {
495 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs;
496 struct vm86_kernel *vm86 = &lp->lwp_thread->td_pcb->pcb_ext->ext_vm86;
498 sf.sf_uc.uc_mcontext.mc_gs = tf->tf_vm86_gs;
499 sf.sf_uc.uc_mcontext.mc_fs = tf->tf_vm86_fs;
500 sf.sf_uc.uc_mcontext.mc_es = tf->tf_vm86_es;
501 sf.sf_uc.uc_mcontext.mc_ds = tf->tf_vm86_ds;
503 if (vm86->vm86_has_vme == 0)
504 sf.sf_uc.uc_mcontext.mc_eflags =
505 (tf->tf_eflags & ~(PSL_VIF | PSL_VIP)) |
506 (vm86->vm86_eflags & (PSL_VIF | PSL_VIP));
509 * Clear PSL_NT to inhibit T_TSSFLT faults on return from
510 * syscalls made by the signal handler. This just avoids
511 * wasting time for our lazy fixup of such faults. PSL_NT
512 * does nothing in vm86 mode, but vm86 programs can set it
513 * almost legitimately in probes for old cpu types.
515 tf->tf_eflags &= ~(PSL_VM | PSL_NT | PSL_VIF | PSL_VIP);
520 * Save the FPU state and reinit the FP unit
522 npxpush(&sf.sf_uc.uc_mcontext);
525 * Copy the sigframe out to the user's stack.
527 if (copyout(&sf, sfp, sizeof(struct sigframe)) != 0) {
529 * Something is wrong with the stack pointer.
530 * ...Kill the process.
535 regs->tf_rsp = (register_t)sfp;
536 regs->tf_rip = PS_STRINGS - *(p->p_sysent->sv_szsigcode);
539 * i386 abi specifies that the direction flag must be cleared
542 regs->tf_rflags &= ~(PSL_T|PSL_D);
545 * 64 bit mode has a code and stack selector but
546 * no data or extra selector. %fs and %gs are not
549 regs->tf_cs = _ucodesel;
550 regs->tf_ss = _udatasel;
554 * Sanitize the trapframe for a virtual kernel passing control to a custom
555 * VM context. Remove any items that would otherwise create a privilage
558 * XXX at the moment we allow userland to set the resume flag. Is this a
562 cpu_sanitize_frame(struct trapframe *frame)
564 frame->tf_cs = _ucodesel;
565 frame->tf_ss = _udatasel;
566 /* XXX VM (8086) mode not supported? */
567 frame->tf_rflags &= (PSL_RF | PSL_USERCHANGE | PSL_VM_UNSUPP);
568 frame->tf_rflags |= PSL_RESERVED_DEFAULT | PSL_I;
574 * Sanitize the tls so loading the descriptor does not blow up
575 * on us. For x86_64 we don't have to do anything.
578 cpu_sanitize_tls(struct savetls *tls)
584 * sigreturn(ucontext_t *sigcntxp)
586 * System call to cleanup state after a signal
587 * has been taken. Reset signal mask and
588 * stack state from context left by sendsig (above).
589 * Return to previous pc and psl as specified by
590 * context left by sendsig. Check carefully to
591 * make sure that the user has not modified the
592 * state to gain improper privileges.
596 #define EFL_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0)
597 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL)
600 sys_sigreturn(struct sigreturn_args *uap)
602 struct lwp *lp = curthread->td_lwp;
603 struct proc *p = lp->lwp_proc;
604 struct trapframe *regs;
612 * We have to copy the information into kernel space so userland
613 * can't modify it while we are sniffing it.
615 regs = lp->lwp_md.md_regs;
616 error = copyin(uap->sigcntxp, &uc, sizeof(uc));
620 rflags = ucp->uc_mcontext.mc_rflags;
622 /* VM (8086) mode not supported */
623 rflags &= ~PSL_VM_UNSUPP;
626 if (eflags & PSL_VM) {
627 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs;
628 struct vm86_kernel *vm86;
631 * if pcb_ext == 0 or vm86_inited == 0, the user hasn't
632 * set up the vm86 area, and we can't enter vm86 mode.
634 if (lp->lwp_thread->td_pcb->pcb_ext == 0)
636 vm86 = &lp->lwp_thread->td_pcb->pcb_ext->ext_vm86;
637 if (vm86->vm86_inited == 0)
640 /* go back to user mode if both flags are set */
641 if ((eflags & PSL_VIP) && (eflags & PSL_VIF))
642 trapsignal(lp, SIGBUS, 0);
644 if (vm86->vm86_has_vme) {
645 eflags = (tf->tf_eflags & ~VME_USERCHANGE) |
646 (eflags & VME_USERCHANGE) | PSL_VM;
648 vm86->vm86_eflags = eflags; /* save VIF, VIP */
649 eflags = (tf->tf_eflags & ~VM_USERCHANGE) |
650 (eflags & VM_USERCHANGE) | PSL_VM;
652 bcopy(&ucp->uc_mcontext.mc_gs, tf, sizeof(struct trapframe));
653 tf->tf_eflags = eflags;
654 tf->tf_vm86_ds = tf->tf_ds;
655 tf->tf_vm86_es = tf->tf_es;
656 tf->tf_vm86_fs = tf->tf_fs;
657 tf->tf_vm86_gs = tf->tf_gs;
658 tf->tf_ds = _udatasel;
659 tf->tf_es = _udatasel;
660 tf->tf_fs = _udatasel;
661 tf->tf_gs = _udatasel;
666 * Don't allow users to change privileged or reserved flags.
669 * XXX do allow users to change the privileged flag PSL_RF.
670 * The cpu sets PSL_RF in tf_eflags for faults. Debuggers
671 * should sometimes set it there too. tf_eflags is kept in
672 * the signal context during signal handling and there is no
673 * other place to remember it, so the PSL_RF bit may be
674 * corrupted by the signal handler without us knowing.
675 * Corruption of the PSL_RF bit at worst causes one more or
676 * one less debugger trap, so allowing it is fairly harmless.
678 if (!EFL_SECURE(rflags & ~PSL_RF, regs->tf_rflags & ~PSL_RF)) {
679 kprintf("sigreturn: rflags = 0x%lx\n", (long)rflags);
684 * Don't allow users to load a valid privileged %cs. Let the
685 * hardware check for invalid selectors, excess privilege in
686 * other selectors, invalid %eip's and invalid %esp's.
688 cs = ucp->uc_mcontext.mc_cs;
689 if (!CS_SECURE(cs)) {
690 kprintf("sigreturn: cs = 0x%x\n", cs);
691 trapsignal(lp, SIGBUS, T_PROTFLT);
694 bcopy(&ucp->uc_mcontext.mc_rdi, regs, sizeof(struct trapframe));
698 * Restore the FPU state from the frame
701 npxpop(&ucp->uc_mcontext);
704 * Merge saved signal mailbox pending flag to maintain interlock
705 * semantics against system calls.
707 if (ucp->uc_mcontext.mc_xflags & PGEX_MAILBOX)
708 p->p_flag |= P_MAILBOX;
710 if (ucp->uc_mcontext.mc_onstack & 1)
711 lp->lwp_sigstk.ss_flags |= SS_ONSTACK;
713 lp->lwp_sigstk.ss_flags &= ~SS_ONSTACK;
715 lp->lwp_sigmask = ucp->uc_sigmask;
716 SIG_CANTMASK(lp->lwp_sigmask);
722 * Stack frame on entry to function. %rax will contain the function vector,
723 * %rcx will contain the function data. flags, rcx, and rax will have
724 * already been pushed on the stack.
735 sendupcall(struct vmupcall *vu, int morepending)
737 struct lwp *lp = curthread->td_lwp;
738 struct trapframe *regs;
739 struct upcall upcall;
740 struct upc_frame upc_frame;
744 * If we are a virtual kernel running an emulated user process
745 * context, switch back to the virtual kernel context before
746 * trying to post the signal.
748 if (lp->lwp_vkernel && lp->lwp_vkernel->ve) {
749 lp->lwp_md.md_regs->tf_trapno = 0;
750 vkernel_trap(lp, lp->lwp_md.md_regs);
754 * Get the upcall data structure
756 if (copyin(lp->lwp_upcall, &upcall, sizeof(upcall)) ||
757 copyin((char *)upcall.upc_uthread + upcall.upc_critoff, &crit_count, sizeof(int))
760 kprintf("bad upcall address\n");
765 * If the data structure is already marked pending or has a critical
766 * section count, mark the data structure as pending and return
767 * without doing an upcall. vu_pending is left set.
769 if (upcall.upc_pending || crit_count >= vu->vu_pending) {
770 if (upcall.upc_pending < vu->vu_pending) {
771 upcall.upc_pending = vu->vu_pending;
772 copyout(&upcall.upc_pending, &lp->lwp_upcall->upc_pending,
773 sizeof(upcall.upc_pending));
779 * We can run this upcall now, clear vu_pending.
781 * Bump our critical section count and set or clear the
782 * user pending flag depending on whether more upcalls are
783 * pending. The user will be responsible for calling
784 * upc_dispatch(-1) to process remaining upcalls.
787 upcall.upc_pending = morepending;
789 copyout(&upcall.upc_pending, &lp->lwp_upcall->upc_pending,
790 sizeof(upcall.upc_pending));
791 copyout(&crit_count, (char *)upcall.upc_uthread + upcall.upc_critoff,
795 * Construct a stack frame and issue the upcall
797 regs = lp->lwp_md.md_regs;
798 upc_frame.rax = regs->tf_rax;
799 upc_frame.rcx = regs->tf_rcx;
800 upc_frame.rdx = regs->tf_rdx;
801 upc_frame.flags = regs->tf_rflags;
802 upc_frame.oldip = regs->tf_rip;
803 if (copyout(&upc_frame, (void *)(regs->tf_rsp - sizeof(upc_frame)),
804 sizeof(upc_frame)) != 0) {
805 kprintf("bad stack on upcall\n");
807 regs->tf_rax = (register_t)vu->vu_func;
808 regs->tf_rcx = (register_t)vu->vu_data;
809 regs->tf_rdx = (register_t)lp->lwp_upcall;
810 regs->tf_rip = (register_t)vu->vu_ctx;
811 regs->tf_rsp -= sizeof(upc_frame);
816 * fetchupcall occurs in the context of a system call, which means that
817 * we have to return EJUSTRETURN in order to prevent eax and edx from
818 * being overwritten by the syscall return value.
820 * if vu is not NULL we return the new context in %edx, the new data in %ecx,
821 * and the function pointer in %eax.
824 fetchupcall(struct vmupcall *vu, int morepending, void *rsp)
826 struct upc_frame upc_frame;
827 struct lwp *lp = curthread->td_lwp;
828 struct trapframe *regs;
830 struct upcall upcall;
833 regs = lp->lwp_md.md_regs;
835 error = copyout(&morepending, &lp->lwp_upcall->upc_pending, sizeof(int));
839 * This jumps us to the next ready context.
842 error = copyin(lp->lwp_upcall, &upcall, sizeof(upcall));
845 error = copyin((char *)upcall.upc_uthread + upcall.upc_critoff, &crit_count, sizeof(int));
848 error = copyout(&crit_count, (char *)upcall.upc_uthread + upcall.upc_critoff, sizeof(int));
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 = (register_t)rsp;
856 * This returns us to the originally interrupted code.
858 error = copyin(rsp, &upc_frame, sizeof(upc_frame));
859 regs->tf_rax = upc_frame.rax;
860 regs->tf_rcx = upc_frame.rcx;
861 regs->tf_rdx = upc_frame.rdx;
862 regs->tf_rflags = (regs->tf_rflags & ~PSL_USERCHANGE) |
863 (upc_frame.flags & PSL_USERCHANGE);
864 regs->tf_rip = upc_frame.oldip;
865 regs->tf_rsp = (register_t)((char *)rsp + sizeof(upc_frame));
874 * Machine dependent boot() routine
876 * I haven't seen anything to put here yet
877 * Possibly some stuff might be grafted back here from boot()
885 * Shutdown the CPU as much as possible
891 __asm__ __volatile("hlt");
895 * cpu_idle() represents the idle LWKT. You cannot return from this function
896 * (unless you want to blow things up!). Instead we look for runnable threads
897 * and loop or halt as appropriate. Giant is not held on entry to the thread.
899 * The main loop is entered with a critical section held, we must release
900 * the critical section before doing anything else. lwkt_switch() will
901 * check for pending interrupts due to entering and exiting its own
904 * NOTE: On an SMP system we rely on a scheduler IPI to wake a HLTed cpu up.
905 * However, there are cases where the idlethread will be entered with
906 * the possibility that no IPI will occur and in such cases
907 * lwkt_switch() sets TDF_IDLE_NOHLT.
909 * NOTE: cpu_idle_hlt again defaults to 2 (use ACPI sleep states). Set to
910 * 1 to just use hlt and for debugging purposes.
912 * NOTE: cpu_idle_repeat determines how many entries into the idle thread
913 * must occur before it starts using ACPI halt.
915 static int cpu_idle_hlt = 2;
916 static int cpu_idle_hltcnt;
917 static int cpu_idle_spincnt;
918 static u_int cpu_idle_repeat = 4;
919 SYSCTL_INT(_machdep, OID_AUTO, cpu_idle_hlt, CTLFLAG_RW,
920 &cpu_idle_hlt, 0, "Idle loop HLT enable");
921 SYSCTL_INT(_machdep, OID_AUTO, cpu_idle_hltcnt, CTLFLAG_RW,
922 &cpu_idle_hltcnt, 0, "Idle loop entry halts");
923 SYSCTL_INT(_machdep, OID_AUTO, cpu_idle_spincnt, CTLFLAG_RW,
924 &cpu_idle_spincnt, 0, "Idle loop entry spins");
925 SYSCTL_INT(_machdep, OID_AUTO, cpu_idle_repeat, CTLFLAG_RW,
926 &cpu_idle_repeat, 0, "Idle entries before acpi hlt");
929 cpu_idle_default_hook(void)
932 * We must guarentee that hlt is exactly the instruction
935 __asm __volatile("sti; hlt");
938 /* Other subsystems (e.g., ACPI) can hook this later. */
939 void (*cpu_idle_hook)(void) = cpu_idle_default_hook;
944 globaldata_t gd = mycpu;
945 struct thread *td __debugvar = gd->gd_curthread;
950 KKASSERT(td->td_critcount == 0);
953 * See if there are any LWKTs ready to go.
958 * When halting inside a cli we must check for reqflags
959 * races, particularly [re]schedule requests. Running
960 * splz() does the job.
963 * 0 Never halt, just spin
965 * 1 Always use HLT (or MONITOR/MWAIT if avail).
966 * This typically eats more power than the
969 * 2 Use HLT/MONITOR/MWAIT up to a point and then
970 * use the ACPI halt (default). This is a hybrid
971 * approach. See machdep.cpu_idle_repeat.
973 * 3 Always use the ACPI halt. This typically
974 * eats the least amount of power but the cpu
975 * will be slow waking up. Slows down e.g.
976 * compiles and other pipe/event oriented stuff.
978 * NOTE: Interrupts are enabled and we are not in a critical
981 * NOTE: Preemptions do not reset gd_idle_repeat. Also we
982 * don't bother capping gd_idle_repeat, it is ok if
985 ++gd->gd_idle_repeat;
986 reqflags = gd->gd_reqflags;
987 quick = (cpu_idle_hlt == 1) ||
989 gd->gd_idle_repeat < cpu_idle_repeat);
991 if (quick && (cpu_mi_feature & CPU_MI_MONITOR) &&
992 (reqflags & RQF_IDLECHECK_WK_MASK) == 0) {
993 cpu_mmw_pause_int(&gd->gd_reqflags, reqflags);
995 } else if (cpu_idle_hlt) {
996 __asm __volatile("cli");
998 if ((gd->gd_reqflags & RQF_IDLECHECK_WK_MASK) == 0) {
1000 cpu_idle_default_hook();
1004 __asm __volatile("sti");
1008 __asm __volatile("sti");
1017 * This routine is called if a spinlock has been held through the
1018 * exponential backoff period and is seriously contested. On a real cpu
1022 cpu_spinlock_contested(void)
1030 * Clear registers on exec
1033 exec_setregs(u_long entry, u_long stack, u_long ps_strings)
1035 struct thread *td = curthread;
1036 struct lwp *lp = td->td_lwp;
1037 struct pcb *pcb = td->td_pcb;
1038 struct trapframe *regs = lp->lwp_md.md_regs;
1040 /* was i386_user_cleanup() in NetBSD */
1043 bzero((char *)regs, sizeof(struct trapframe));
1044 regs->tf_rip = entry;
1045 regs->tf_rsp = ((stack - 8) & ~0xFul) + 8; /* align the stack */
1046 regs->tf_rdi = stack; /* argv */
1047 regs->tf_rflags = PSL_USER | (regs->tf_rflags & PSL_T);
1048 regs->tf_ss = _udatasel;
1049 regs->tf_cs = _ucodesel;
1050 regs->tf_rbx = ps_strings;
1053 * Reset the hardware debug registers if they were in use.
1054 * They won't have any meaning for the newly exec'd process.
1056 if (pcb->pcb_flags & PCB_DBREGS) {
1062 pcb->pcb_dr7 = 0; /* JG set bit 10? */
1063 if (pcb == td->td_pcb) {
1065 * Clear the debug registers on the running
1066 * CPU, otherwise they will end up affecting
1067 * the next process we switch to.
1071 pcb->pcb_flags &= ~PCB_DBREGS;
1075 * Initialize the math emulator (if any) for the current process.
1076 * Actually, just clear the bit that says that the emulator has
1077 * been initialized. Initialization is delayed until the process
1078 * traps to the emulator (if it is done at all) mainly because
1079 * emulators don't provide an entry point for initialization.
1081 pcb->pcb_flags &= ~FP_SOFTFP;
1084 * NOTE: do not set CR0_TS here. npxinit() must do it after clearing
1085 * gd_npxthread. Otherwise a preemptive interrupt thread
1086 * may panic in npxdna().
1089 load_cr0(rcr0() | CR0_MP);
1092 * NOTE: The MSR values must be correct so we can return to
1093 * userland. gd_user_fs/gs must be correct so the switch
1094 * code knows what the current MSR values are.
1096 pcb->pcb_fsbase = 0; /* Values loaded from PCB on switch */
1097 pcb->pcb_gsbase = 0;
1098 mdcpu->gd_user_fs = 0; /* Cache of current MSR values */
1099 mdcpu->gd_user_gs = 0;
1100 wrmsr(MSR_FSBASE, 0); /* Set MSR values for return to userland */
1101 wrmsr(MSR_KGSBASE, 0);
1103 /* Initialize the npx (if any) for the current process. */
1104 npxinit(__INITIAL_NPXCW__);
1107 pcb->pcb_ds = _udatasel;
1108 pcb->pcb_es = _udatasel;
1109 pcb->pcb_fs = _udatasel;
1110 pcb->pcb_gs = _udatasel;
1119 cr0 |= CR0_NE; /* Done by npxinit() */
1120 cr0 |= CR0_MP | CR0_TS; /* Done at every execve() too. */
1121 cr0 |= CR0_WP | CR0_AM;
1127 sysctl_machdep_adjkerntz(SYSCTL_HANDLER_ARGS)
1130 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2,
1132 if (!error && req->newptr)
1137 SYSCTL_PROC(_machdep, CPU_ADJKERNTZ, adjkerntz, CTLTYPE_INT|CTLFLAG_RW,
1138 &adjkerntz, 0, sysctl_machdep_adjkerntz, "I", "");
1140 SYSCTL_INT(_machdep, CPU_DISRTCSET, disable_rtc_set,
1141 CTLFLAG_RW, &disable_rtc_set, 0, "");
1144 SYSCTL_STRUCT(_machdep, CPU_BOOTINFO, bootinfo,
1145 CTLFLAG_RD, &bootinfo, bootinfo, "");
1148 SYSCTL_INT(_machdep, CPU_WALLCLOCK, wall_cmos_clock,
1149 CTLFLAG_RW, &wall_cmos_clock, 0, "");
1151 extern u_long bootdev; /* not a cdev_t - encoding is different */
1152 SYSCTL_ULONG(_machdep, OID_AUTO, guessed_bootdev,
1153 CTLFLAG_RD, &bootdev, 0, "Boot device (not in cdev_t format)");
1156 * Initialize 386 and configure to run kernel
1160 * Initialize segments & interrupt table
1164 struct user_segment_descriptor gdt[NGDT * MAXCPU]; /* global descriptor table */
1165 static struct gate_descriptor idt0[NIDT];
1166 struct gate_descriptor *idt = &idt0[0]; /* interrupt descriptor table */
1168 union descriptor ldt[NLDT]; /* local descriptor table */
1171 /* table descriptors - used to load tables by cpu */
1172 struct region_descriptor r_gdt, r_idt;
1174 #if defined(I586_CPU) && !defined(NO_F00F_HACK)
1175 extern int has_f00f_bug;
1178 /* JG proc0paddr is a virtual address */
1181 char proc0paddr_buff[LWKT_THREAD_STACK];
1184 /* software prototypes -- in more palatable form */
1185 struct soft_segment_descriptor gdt_segs[] = {
1186 /* GNULL_SEL 0 Null Descriptor */
1187 { 0x0, /* segment base address */
1189 0, /* segment type */
1190 0, /* segment descriptor priority level */
1191 0, /* segment descriptor present */
1193 0, /* default 32 vs 16 bit size */
1194 0 /* limit granularity (byte/page units)*/ },
1195 /* GCODE_SEL 1 Code Descriptor for kernel */
1196 { 0x0, /* segment base address */
1197 0xfffff, /* length - all address space */
1198 SDT_MEMERA, /* segment type */
1199 SEL_KPL, /* segment descriptor priority level */
1200 1, /* segment descriptor present */
1202 0, /* default 32 vs 16 bit size */
1203 1 /* limit granularity (byte/page units)*/ },
1204 /* GDATA_SEL 2 Data Descriptor for kernel */
1205 { 0x0, /* segment base address */
1206 0xfffff, /* length - all address space */
1207 SDT_MEMRWA, /* segment type */
1208 SEL_KPL, /* segment descriptor priority level */
1209 1, /* segment descriptor present */
1211 0, /* default 32 vs 16 bit size */
1212 1 /* limit granularity (byte/page units)*/ },
1213 /* GUCODE32_SEL 3 32 bit Code Descriptor for user */
1214 { 0x0, /* segment base address */
1215 0xfffff, /* length - all address space */
1216 SDT_MEMERA, /* segment type */
1217 SEL_UPL, /* segment descriptor priority level */
1218 1, /* segment descriptor present */
1220 1, /* default 32 vs 16 bit size */
1221 1 /* limit granularity (byte/page units)*/ },
1222 /* GUDATA_SEL 4 32/64 bit Data Descriptor for user */
1223 { 0x0, /* segment base address */
1224 0xfffff, /* length - all address space */
1225 SDT_MEMRWA, /* segment type */
1226 SEL_UPL, /* segment descriptor priority level */
1227 1, /* segment descriptor present */
1229 1, /* default 32 vs 16 bit size */
1230 1 /* limit granularity (byte/page units)*/ },
1231 /* GUCODE_SEL 5 64 bit Code Descriptor for user */
1232 { 0x0, /* segment base address */
1233 0xfffff, /* length - all address space */
1234 SDT_MEMERA, /* segment type */
1235 SEL_UPL, /* segment descriptor priority level */
1236 1, /* segment descriptor present */
1238 0, /* default 32 vs 16 bit size */
1239 1 /* limit granularity (byte/page units)*/ },
1240 /* GPROC0_SEL 6 Proc 0 Tss Descriptor */
1242 0x0, /* segment base address */
1243 sizeof(struct x86_64tss)-1,/* length - all address space */
1244 SDT_SYSTSS, /* segment type */
1245 SEL_KPL, /* segment descriptor priority level */
1246 1, /* segment descriptor present */
1248 0, /* unused - default 32 vs 16 bit size */
1249 0 /* limit granularity (byte/page units)*/ },
1250 /* Actually, the TSS is a system descriptor which is double size */
1251 { 0x0, /* segment base address */
1253 0, /* segment type */
1254 0, /* segment descriptor priority level */
1255 0, /* segment descriptor present */
1257 0, /* default 32 vs 16 bit size */
1258 0 /* limit granularity (byte/page units)*/ },
1259 /* GUGS32_SEL 8 32 bit GS Descriptor for user */
1260 { 0x0, /* segment base address */
1261 0xfffff, /* length - all address space */
1262 SDT_MEMRWA, /* segment type */
1263 SEL_UPL, /* segment descriptor priority level */
1264 1, /* segment descriptor present */
1266 1, /* default 32 vs 16 bit size */
1267 1 /* limit granularity (byte/page units)*/ },
1271 setidt(int idx, inthand_t *func, int typ, int dpl, int ist)
1273 struct gate_descriptor *ip;
1276 ip->gd_looffset = (uintptr_t)func;
1277 ip->gd_selector = GSEL(GCODE_SEL, SEL_KPL);
1283 ip->gd_hioffset = ((uintptr_t)func)>>16 ;
1286 #define IDTVEC(name) __CONCAT(X,name)
1289 IDTVEC(div), IDTVEC(dbg), IDTVEC(nmi), IDTVEC(bpt), IDTVEC(ofl),
1290 IDTVEC(bnd), IDTVEC(ill), IDTVEC(dna), IDTVEC(fpusegm),
1291 IDTVEC(tss), IDTVEC(missing), IDTVEC(stk), IDTVEC(prot),
1292 IDTVEC(page), IDTVEC(mchk), IDTVEC(rsvd), IDTVEC(fpu), IDTVEC(align),
1293 IDTVEC(xmm), IDTVEC(dblfault),
1294 IDTVEC(fast_syscall), IDTVEC(fast_syscall32);
1296 #ifdef DEBUG_INTERRUPTS
1297 extern inthand_t *Xrsvdary[256];
1301 sdtossd(struct user_segment_descriptor *sd, struct soft_segment_descriptor *ssd)
1303 ssd->ssd_base = (sd->sd_hibase << 24) | sd->sd_lobase;
1304 ssd->ssd_limit = (sd->sd_hilimit << 16) | sd->sd_lolimit;
1305 ssd->ssd_type = sd->sd_type;
1306 ssd->ssd_dpl = sd->sd_dpl;
1307 ssd->ssd_p = sd->sd_p;
1308 ssd->ssd_def32 = sd->sd_def32;
1309 ssd->ssd_gran = sd->sd_gran;
1313 ssdtosd(struct soft_segment_descriptor *ssd, struct user_segment_descriptor *sd)
1316 sd->sd_lobase = (ssd->ssd_base) & 0xffffff;
1317 sd->sd_hibase = (ssd->ssd_base >> 24) & 0xff;
1318 sd->sd_lolimit = (ssd->ssd_limit) & 0xffff;
1319 sd->sd_hilimit = (ssd->ssd_limit >> 16) & 0xf;
1320 sd->sd_type = ssd->ssd_type;
1321 sd->sd_dpl = ssd->ssd_dpl;
1322 sd->sd_p = ssd->ssd_p;
1323 sd->sd_long = ssd->ssd_long;
1324 sd->sd_def32 = ssd->ssd_def32;
1325 sd->sd_gran = ssd->ssd_gran;
1329 ssdtosyssd(struct soft_segment_descriptor *ssd,
1330 struct system_segment_descriptor *sd)
1333 sd->sd_lobase = (ssd->ssd_base) & 0xffffff;
1334 sd->sd_hibase = (ssd->ssd_base >> 24) & 0xfffffffffful;
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_gran = ssd->ssd_gran;
1344 * Populate the (physmap) array with base/bound pairs describing the
1345 * available physical memory in the system, then test this memory and
1346 * build the phys_avail array describing the actually-available memory.
1348 * If we cannot accurately determine the physical memory map, then use
1349 * value from the 0xE801 call, and failing that, the RTC.
1351 * Total memory size may be set by the kernel environment variable
1352 * hw.physmem or the compile-time define MAXMEM.
1354 * Memory is aligned to PHYSMAP_ALIGN which must be a multiple
1355 * of PAGE_SIZE. This also greatly reduces the memory test time
1356 * which would otherwise be excessive on machines with > 8G of ram.
1358 * XXX first should be vm_paddr_t.
1361 #define PHYSMAP_ALIGN (vm_paddr_t)(128 * 1024)
1362 #define PHYSMAP_ALIGN_MASK (vm_paddr_t)(PHYSMAP_ALIGN - 1)
1365 getmemsize(caddr_t kmdp, u_int64_t first)
1367 int off, physmap_idx, pa_indx, da_indx;
1369 vm_paddr_t physmap[PHYSMAP_SIZE];
1371 vm_paddr_t msgbuf_size;
1372 u_long physmem_tunable;
1374 struct bios_smap *smapbase, *smap, *smapend;
1376 quad_t dcons_addr, dcons_size;
1378 bzero(physmap, sizeof(physmap));
1382 * get memory map from INT 15:E820, kindly supplied by the loader.
1384 * subr_module.c says:
1385 * "Consumer may safely assume that size value precedes data."
1386 * ie: an int32_t immediately precedes smap.
1388 smapbase = (struct bios_smap *)preload_search_info(kmdp,
1389 MODINFO_METADATA | MODINFOMD_SMAP);
1390 if (smapbase == NULL)
1391 panic("No BIOS smap info from loader!");
1393 smapsize = *((u_int32_t *)smapbase - 1);
1394 smapend = (struct bios_smap *)((uintptr_t)smapbase + smapsize);
1396 for (smap = smapbase; smap < smapend; smap++) {
1397 if (boothowto & RB_VERBOSE)
1398 kprintf("SMAP type=%02x base=%016lx len=%016lx\n",
1399 smap->type, smap->base, smap->length);
1401 if (smap->type != SMAP_TYPE_MEMORY)
1404 if (smap->length == 0)
1407 for (i = 0; i <= physmap_idx; i += 2) {
1408 if (smap->base < physmap[i + 1]) {
1409 if (boothowto & RB_VERBOSE) {
1410 kprintf("Overlapping or non-monotonic "
1411 "memory region, ignoring "
1417 Realmem += smap->length;
1419 if (smap->base == physmap[physmap_idx + 1]) {
1420 physmap[physmap_idx + 1] += smap->length;
1425 if (physmap_idx == PHYSMAP_SIZE) {
1426 kprintf("Too many segments in the physical "
1427 "address map, giving up\n");
1430 physmap[physmap_idx] = smap->base;
1431 physmap[physmap_idx + 1] = smap->base + smap->length;
1435 /* make hole for AP bootstrap code */
1436 physmap[1] = mp_bootaddress(physmap[1] / 1024);
1438 /* Save EBDA address, if any */
1439 ebda_addr = (u_long)(*(u_short *)(KERNBASE + 0x40e));
1444 * Maxmem isn't the "maximum memory", it's one larger than the
1445 * highest page of the physical address space. It should be
1446 * called something like "Maxphyspage". We may adjust this
1447 * based on ``hw.physmem'' and the results of the memory test.
1449 Maxmem = atop(physmap[physmap_idx + 1]);
1452 Maxmem = MAXMEM / 4;
1455 if (TUNABLE_ULONG_FETCH("hw.physmem", &physmem_tunable))
1456 Maxmem = atop(physmem_tunable);
1459 * Don't allow MAXMEM or hw.physmem to extend the amount of memory
1462 if (Maxmem > atop(physmap[physmap_idx + 1]))
1463 Maxmem = atop(physmap[physmap_idx + 1]);
1466 * Blowing out the DMAP will blow up the system.
1468 if (Maxmem > atop(DMAP_MAX_ADDRESS - DMAP_MIN_ADDRESS)) {
1469 kprintf("Limiting Maxmem due to DMAP size\n");
1470 Maxmem = atop(DMAP_MAX_ADDRESS - DMAP_MIN_ADDRESS);
1473 if (atop(physmap[physmap_idx + 1]) != Maxmem &&
1474 (boothowto & RB_VERBOSE)) {
1475 kprintf("Physical memory use set to %ldK\n", Maxmem * 4);
1479 * Call pmap initialization to make new kernel address space
1483 pmap_bootstrap(&first);
1484 physmap[0] = PAGE_SIZE;
1487 * Align the physmap to PHYSMAP_ALIGN and cut out anything
1490 for (i = j = 0; i <= physmap_idx; i += 2) {
1491 if (physmap[i+1] > ptoa((vm_paddr_t)Maxmem))
1492 physmap[i+1] = ptoa((vm_paddr_t)Maxmem);
1493 physmap[i] = (physmap[i] + PHYSMAP_ALIGN_MASK) &
1494 ~PHYSMAP_ALIGN_MASK;
1495 physmap[i+1] = physmap[i+1] & ~PHYSMAP_ALIGN_MASK;
1497 physmap[j] = physmap[i];
1498 physmap[j+1] = physmap[i+1];
1500 if (physmap[i] < physmap[i+1])
1503 physmap_idx = j - 2;
1506 * Align anything else used in the validation loop.
1508 first = (first + PHYSMAP_ALIGN_MASK) & ~PHYSMAP_ALIGN_MASK;
1511 * Size up each available chunk of physical memory.
1515 phys_avail[pa_indx++] = physmap[0];
1516 phys_avail[pa_indx] = physmap[0];
1517 dump_avail[da_indx] = physmap[0];
1521 * Get dcons buffer address
1523 if (kgetenv_quad("dcons.addr", &dcons_addr) == 0 ||
1524 kgetenv_quad("dcons.size", &dcons_size) == 0)
1528 * Validate the physical memory. The physical memory segments
1529 * have already been aligned to PHYSMAP_ALIGN which is a multiple
1532 for (i = 0; i <= physmap_idx; i += 2) {
1535 end = physmap[i + 1];
1537 for (pa = physmap[i]; pa < end; pa += PHYSMAP_ALIGN) {
1538 int tmp, page_bad, full;
1539 int *ptr = (int *)CADDR1;
1543 * block out kernel memory as not available.
1545 if (pa >= 0x100000 && pa < first)
1549 * block out dcons buffer
1552 && pa >= trunc_page(dcons_addr)
1553 && pa < dcons_addr + dcons_size) {
1560 * map page into kernel: valid, read/write,non-cacheable
1562 *pte = pa | PG_V | PG_RW | PG_N;
1567 * Test for alternating 1's and 0's
1569 *(volatile int *)ptr = 0xaaaaaaaa;
1571 if (*(volatile int *)ptr != 0xaaaaaaaa)
1574 * Test for alternating 0's and 1's
1576 *(volatile int *)ptr = 0x55555555;
1578 if (*(volatile int *)ptr != 0x55555555)
1583 *(volatile int *)ptr = 0xffffffff;
1585 if (*(volatile int *)ptr != 0xffffffff)
1590 *(volatile int *)ptr = 0x0;
1592 if (*(volatile int *)ptr != 0x0)
1595 * Restore original value.
1600 * Adjust array of valid/good pages.
1602 if (page_bad == TRUE)
1605 * If this good page is a continuation of the
1606 * previous set of good pages, then just increase
1607 * the end pointer. Otherwise start a new chunk.
1608 * Note that "end" points one higher than end,
1609 * making the range >= start and < end.
1610 * If we're also doing a speculative memory
1611 * test and we at or past the end, bump up Maxmem
1612 * so that we keep going. The first bad page
1613 * will terminate the loop.
1615 if (phys_avail[pa_indx] == pa) {
1616 phys_avail[pa_indx] += PHYSMAP_ALIGN;
1619 if (pa_indx == PHYS_AVAIL_ARRAY_END) {
1621 "Too many holes in the physical address space, giving up\n");
1626 phys_avail[pa_indx++] = pa;
1627 phys_avail[pa_indx] = pa + PHYSMAP_ALIGN;
1629 physmem += PHYSMAP_ALIGN / PAGE_SIZE;
1631 if (dump_avail[da_indx] == pa) {
1632 dump_avail[da_indx] += PHYSMAP_ALIGN;
1635 if (da_indx == DUMP_AVAIL_ARRAY_END) {
1639 dump_avail[da_indx++] = pa;
1640 dump_avail[da_indx] = pa + PHYSMAP_ALIGN;
1651 * The last chunk must contain at least one page plus the message
1652 * buffer to avoid complicating other code (message buffer address
1653 * calculation, etc.).
1655 msgbuf_size = (MSGBUF_SIZE + PHYSMAP_ALIGN_MASK) & ~PHYSMAP_ALIGN_MASK;
1657 while (phys_avail[pa_indx - 1] + PHYSMAP_ALIGN +
1658 msgbuf_size >= phys_avail[pa_indx]) {
1659 physmem -= atop(phys_avail[pa_indx] - phys_avail[pa_indx - 1]);
1660 phys_avail[pa_indx--] = 0;
1661 phys_avail[pa_indx--] = 0;
1664 Maxmem = atop(phys_avail[pa_indx]);
1666 /* Trim off space for the message buffer. */
1667 phys_avail[pa_indx] -= msgbuf_size;
1669 avail_end = phys_avail[pa_indx];
1671 /* Map the message buffer. */
1672 for (off = 0; off < msgbuf_size; off += PAGE_SIZE) {
1673 pmap_kenter((vm_offset_t)msgbufp + off,
1674 phys_avail[pa_indx] + off);
1679 int ioapic_use_old = 0;
1682 int apic_io_enable = 1; /* Enabled by default for kernels compiled w/APIC_IO */
1684 int apic_io_enable = 0; /* Disabled by default for kernels compiled without */
1688 struct machintr_abi MachIntrABI;
1699 * 7 Device Not Available (x87)
1701 * 9 Coprocessor Segment overrun (unsupported, reserved)
1703 * 11 Segment not present
1705 * 13 General Protection
1708 * 16 x87 FP Exception pending
1709 * 17 Alignment Check
1711 * 19 SIMD floating point
1713 * 32-255 INTn/external sources
1716 hammer_time(u_int64_t modulep, u_int64_t physfree)
1721 int metadata_missing, off;
1723 struct mdglobaldata *gd;
1727 * Prevent lowering of the ipl if we call tsleep() early.
1729 gd = &CPU_prvspace[0].mdglobaldata;
1730 bzero(gd, sizeof(*gd));
1733 * Note: on both UP and SMP curthread must be set non-NULL
1734 * early in the boot sequence because the system assumes
1735 * that 'curthread' is never NULL.
1738 gd->mi.gd_curthread = &thread0;
1739 thread0.td_gd = &gd->mi;
1741 atdevbase = ISA_HOLE_START + PTOV_OFFSET;
1744 metadata_missing = 0;
1745 if (bootinfo.bi_modulep) {
1746 preload_metadata = (caddr_t)bootinfo.bi_modulep + KERNBASE;
1747 preload_bootstrap_relocate(KERNBASE);
1749 metadata_missing = 1;
1751 if (bootinfo.bi_envp)
1752 kern_envp = (caddr_t)bootinfo.bi_envp + KERNBASE;
1755 preload_metadata = (caddr_t)(uintptr_t)(modulep + PTOV_OFFSET);
1756 preload_bootstrap_relocate(PTOV_OFFSET);
1757 kmdp = preload_search_by_type("elf kernel");
1759 kmdp = preload_search_by_type("elf64 kernel");
1760 boothowto = MD_FETCH(kmdp, MODINFOMD_HOWTO, int);
1761 kern_envp = MD_FETCH(kmdp, MODINFOMD_ENVP, char *) + PTOV_OFFSET;
1763 ksym_start = MD_FETCH(kmdp, MODINFOMD_SSYM, uintptr_t);
1764 ksym_end = MD_FETCH(kmdp, MODINFOMD_ESYM, uintptr_t);
1767 if (boothowto & RB_VERBOSE)
1771 * Default MachIntrABI to ICU
1773 MachIntrABI = MachIntrABI_ICU;
1775 TUNABLE_INT_FETCH("hw.apic_io_enable", &apic_io_enable);
1776 TUNABLE_INT_FETCH("hw.ioapic_use_old", &ioapic_use_old);
1780 * start with one cpu. Note: with one cpu, ncpus2_shift, ncpus2_mask,
1781 * and ncpus_fit_mask remain 0.
1786 /* Init basic tunables, hz etc */
1790 * make gdt memory segments
1792 gdt_segs[GPROC0_SEL].ssd_base =
1793 (uintptr_t) &CPU_prvspace[0].mdglobaldata.gd_common_tss;
1795 gd->mi.gd_prvspace = &CPU_prvspace[0];
1797 for (x = 0; x < NGDT; x++) {
1798 if (x != GPROC0_SEL && x != (GPROC0_SEL + 1))
1799 ssdtosd(&gdt_segs[x], &gdt[x]);
1801 ssdtosyssd(&gdt_segs[GPROC0_SEL],
1802 (struct system_segment_descriptor *)&gdt[GPROC0_SEL]);
1804 r_gdt.rd_limit = NGDT * sizeof(gdt[0]) - 1;
1805 r_gdt.rd_base = (long) gdt;
1808 wrmsr(MSR_FSBASE, 0); /* User value */
1809 wrmsr(MSR_GSBASE, (u_int64_t)&gd->mi);
1810 wrmsr(MSR_KGSBASE, 0); /* User value while in the kernel */
1812 mi_gdinit(&gd->mi, 0);
1814 proc0paddr = proc0paddr_buff;
1815 mi_proc0init(&gd->mi, proc0paddr);
1816 safepri = TDPRI_MAX;
1818 /* spinlocks and the BGL */
1822 for (x = 0; x < NIDT; x++)
1823 setidt(x, &IDTVEC(rsvd), SDT_SYSIGT, SEL_KPL, 0);
1824 setidt(IDT_DE, &IDTVEC(div), SDT_SYSIGT, SEL_KPL, 0);
1825 setidt(IDT_DB, &IDTVEC(dbg), SDT_SYSIGT, SEL_KPL, 0);
1826 setidt(IDT_NMI, &IDTVEC(nmi), SDT_SYSIGT, SEL_KPL, 1);
1827 setidt(IDT_BP, &IDTVEC(bpt), SDT_SYSIGT, SEL_UPL, 0);
1828 setidt(IDT_OF, &IDTVEC(ofl), SDT_SYSIGT, SEL_KPL, 0);
1829 setidt(IDT_BR, &IDTVEC(bnd), SDT_SYSIGT, SEL_KPL, 0);
1830 setidt(IDT_UD, &IDTVEC(ill), SDT_SYSIGT, SEL_KPL, 0);
1831 setidt(IDT_NM, &IDTVEC(dna), SDT_SYSIGT, SEL_KPL, 0);
1832 setidt(IDT_DF, &IDTVEC(dblfault), SDT_SYSIGT, SEL_KPL, 1);
1833 setidt(IDT_FPUGP, &IDTVEC(fpusegm), SDT_SYSIGT, SEL_KPL, 0);
1834 setidt(IDT_TS, &IDTVEC(tss), SDT_SYSIGT, SEL_KPL, 0);
1835 setidt(IDT_NP, &IDTVEC(missing), SDT_SYSIGT, SEL_KPL, 0);
1836 setidt(IDT_SS, &IDTVEC(stk), SDT_SYSIGT, SEL_KPL, 0);
1837 setidt(IDT_GP, &IDTVEC(prot), SDT_SYSIGT, SEL_KPL, 0);
1838 setidt(IDT_PF, &IDTVEC(page), SDT_SYSIGT, SEL_KPL, 0);
1839 setidt(IDT_MF, &IDTVEC(fpu), SDT_SYSIGT, SEL_KPL, 0);
1840 setidt(IDT_AC, &IDTVEC(align), SDT_SYSIGT, SEL_KPL, 0);
1841 setidt(IDT_MC, &IDTVEC(mchk), SDT_SYSIGT, SEL_KPL, 0);
1842 setidt(IDT_XF, &IDTVEC(xmm), SDT_SYSIGT, SEL_KPL, 0);
1844 r_idt.rd_limit = sizeof(idt0) - 1;
1845 r_idt.rd_base = (long) idt;
1849 * Initialize the console before we print anything out.
1854 if (metadata_missing)
1855 kprintf("WARNING: loader(8) metadata is missing!\n");
1865 * Initialize IRQ mapping
1868 * SHOULD be after elcr_probe()
1870 MachIntrABI_ICU.initmap();
1872 MachIntrABI_IOAPIC.initmap();
1877 if (boothowto & RB_KDB)
1878 Debugger("Boot flags requested debugger");
1882 finishidentcpu(); /* Final stage of CPU initialization */
1883 setidt(6, &IDTVEC(ill), SDT_SYS386IGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1884 setidt(13, &IDTVEC(prot), SDT_SYS386IGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1886 identify_cpu(); /* Final stage of CPU initialization */
1887 initializecpu(); /* Initialize CPU registers */
1889 /* make an initial tss so cpu can get interrupt stack on syscall! */
1890 gd->gd_common_tss.tss_rsp0 =
1891 (register_t)(thread0.td_kstack +
1892 KSTACK_PAGES * PAGE_SIZE - sizeof(struct pcb));
1893 /* Ensure the stack is aligned to 16 bytes */
1894 gd->gd_common_tss.tss_rsp0 &= ~(register_t)0xF;
1896 /* double fault stack */
1897 gd->gd_common_tss.tss_ist1 =
1898 (long)&gd->mi.gd_prvspace->idlestack[
1899 sizeof(gd->mi.gd_prvspace->idlestack)];
1901 /* Set the IO permission bitmap (empty due to tss seg limit) */
1902 gd->gd_common_tss.tss_iobase = sizeof(struct x86_64tss);
1904 gsel_tss = GSEL(GPROC0_SEL, SEL_KPL);
1905 gd->gd_tss_gdt = &gdt[GPROC0_SEL];
1906 gd->gd_common_tssd = *gd->gd_tss_gdt;
1909 /* Set up the fast syscall stuff */
1910 msr = rdmsr(MSR_EFER) | EFER_SCE;
1911 wrmsr(MSR_EFER, msr);
1912 wrmsr(MSR_LSTAR, (u_int64_t)IDTVEC(fast_syscall));
1913 wrmsr(MSR_CSTAR, (u_int64_t)IDTVEC(fast_syscall32));
1914 msr = ((u_int64_t)GSEL(GCODE_SEL, SEL_KPL) << 32) |
1915 ((u_int64_t)GSEL(GUCODE32_SEL, SEL_UPL) << 48);
1916 wrmsr(MSR_STAR, msr);
1917 wrmsr(MSR_SF_MASK, PSL_NT|PSL_T|PSL_I|PSL_C|PSL_D);
1919 getmemsize(kmdp, physfree);
1920 init_param2(physmem);
1922 /* now running on new page tables, configured,and u/iom is accessible */
1924 /* Map the message buffer. */
1926 for (off = 0; off < round_page(MSGBUF_SIZE); off += PAGE_SIZE)
1927 pmap_kenter((vm_offset_t)msgbufp + off, avail_end + off);
1930 msgbufinit(msgbufp, MSGBUF_SIZE);
1933 /* transfer to user mode */
1935 _ucodesel = GSEL(GUCODE_SEL, SEL_UPL);
1936 _udatasel = GSEL(GUDATA_SEL, SEL_UPL);
1937 _ucode32sel = GSEL(GUCODE32_SEL, SEL_UPL);
1943 /* setup proc 0's pcb */
1944 thread0.td_pcb->pcb_flags = 0;
1945 thread0.td_pcb->pcb_cr3 = KPML4phys;
1946 thread0.td_pcb->pcb_ext = 0;
1947 lwp0.lwp_md.md_regs = &proc0_tf; /* XXX needed? */
1949 /* Location of kernel stack for locore */
1950 return ((u_int64_t)thread0.td_pcb);
1954 * Initialize machine-dependant portions of the global data structure.
1955 * Note that the global data area and cpu0's idlestack in the private
1956 * data space were allocated in locore.
1958 * Note: the idlethread's cpl is 0
1960 * WARNING! Called from early boot, 'mycpu' may not work yet.
1963 cpu_gdinit(struct mdglobaldata *gd, int cpu)
1966 gd->mi.gd_curthread = &gd->mi.gd_idlethread;
1968 lwkt_init_thread(&gd->mi.gd_idlethread,
1969 gd->mi.gd_prvspace->idlestack,
1970 sizeof(gd->mi.gd_prvspace->idlestack),
1972 lwkt_set_comm(&gd->mi.gd_idlethread, "idle_%d", cpu);
1973 gd->mi.gd_idlethread.td_switch = cpu_lwkt_switch;
1974 gd->mi.gd_idlethread.td_sp -= sizeof(void *);
1975 *(void **)gd->mi.gd_idlethread.td_sp = cpu_idle_restore;
1979 is_globaldata_space(vm_offset_t saddr, vm_offset_t eaddr)
1981 if (saddr >= (vm_offset_t)&CPU_prvspace[0] &&
1982 eaddr <= (vm_offset_t)&CPU_prvspace[MAXCPU]) {
1989 globaldata_find(int cpu)
1991 KKASSERT(cpu >= 0 && cpu < ncpus);
1992 return(&CPU_prvspace[cpu].mdglobaldata.mi);
1995 #if defined(I586_CPU) && !defined(NO_F00F_HACK)
1996 static void f00f_hack(void *unused);
1997 SYSINIT(f00f_hack, SI_BOOT2_BIOS, SI_ORDER_ANY, f00f_hack, NULL);
2000 f00f_hack(void *unused)
2002 struct gate_descriptor *new_idt;
2008 kprintf("Intel Pentium detected, installing workaround for F00F bug\n");
2010 r_idt.rd_limit = sizeof(idt0) - 1;
2012 tmp = kmem_alloc(&kernel_map, PAGE_SIZE * 2);
2014 panic("kmem_alloc returned 0");
2015 if (((unsigned int)tmp & (PAGE_SIZE-1)) != 0)
2016 panic("kmem_alloc returned non-page-aligned memory");
2017 /* Put the first seven entries in the lower page */
2018 new_idt = (struct gate_descriptor*)(tmp + PAGE_SIZE - (7*8));
2019 bcopy(idt, new_idt, sizeof(idt0));
2020 r_idt.rd_base = (int)new_idt;
2023 if (vm_map_protect(&kernel_map, tmp, tmp + PAGE_SIZE,
2024 VM_PROT_READ, FALSE) != KERN_SUCCESS)
2025 panic("vm_map_protect failed");
2028 #endif /* defined(I586_CPU) && !NO_F00F_HACK */
2031 ptrace_set_pc(struct lwp *lp, unsigned long addr)
2033 lp->lwp_md.md_regs->tf_rip = addr;
2038 ptrace_single_step(struct lwp *lp)
2040 lp->lwp_md.md_regs->tf_rflags |= PSL_T;
2045 fill_regs(struct lwp *lp, struct reg *regs)
2047 struct trapframe *tp;
2049 tp = lp->lwp_md.md_regs;
2050 bcopy(&tp->tf_rdi, ®s->r_rdi, sizeof(*regs));
2055 set_regs(struct lwp *lp, struct reg *regs)
2057 struct trapframe *tp;
2059 tp = lp->lwp_md.md_regs;
2060 if (!EFL_SECURE(regs->r_rflags, tp->tf_rflags) ||
2061 !CS_SECURE(regs->r_cs))
2063 bcopy(®s->r_rdi, &tp->tf_rdi, sizeof(*regs));
2067 #ifndef CPU_DISABLE_SSE
2069 fill_fpregs_xmm(struct savexmm *sv_xmm, struct save87 *sv_87)
2071 struct env87 *penv_87 = &sv_87->sv_env;
2072 struct envxmm *penv_xmm = &sv_xmm->sv_env;
2075 /* FPU control/status */
2076 penv_87->en_cw = penv_xmm->en_cw;
2077 penv_87->en_sw = penv_xmm->en_sw;
2078 penv_87->en_tw = penv_xmm->en_tw;
2079 penv_87->en_fip = penv_xmm->en_fip;
2080 penv_87->en_fcs = penv_xmm->en_fcs;
2081 penv_87->en_opcode = penv_xmm->en_opcode;
2082 penv_87->en_foo = penv_xmm->en_foo;
2083 penv_87->en_fos = penv_xmm->en_fos;
2086 for (i = 0; i < 8; ++i)
2087 sv_87->sv_ac[i] = sv_xmm->sv_fp[i].fp_acc;
2091 set_fpregs_xmm(struct save87 *sv_87, struct savexmm *sv_xmm)
2093 struct env87 *penv_87 = &sv_87->sv_env;
2094 struct envxmm *penv_xmm = &sv_xmm->sv_env;
2097 /* FPU control/status */
2098 penv_xmm->en_cw = penv_87->en_cw;
2099 penv_xmm->en_sw = penv_87->en_sw;
2100 penv_xmm->en_tw = penv_87->en_tw;
2101 penv_xmm->en_fip = penv_87->en_fip;
2102 penv_xmm->en_fcs = penv_87->en_fcs;
2103 penv_xmm->en_opcode = penv_87->en_opcode;
2104 penv_xmm->en_foo = penv_87->en_foo;
2105 penv_xmm->en_fos = penv_87->en_fos;
2108 for (i = 0; i < 8; ++i)
2109 sv_xmm->sv_fp[i].fp_acc = sv_87->sv_ac[i];
2111 #endif /* CPU_DISABLE_SSE */
2114 fill_fpregs(struct lwp *lp, struct fpreg *fpregs)
2116 #ifndef CPU_DISABLE_SSE
2118 fill_fpregs_xmm(&lp->lwp_thread->td_pcb->pcb_save.sv_xmm,
2119 (struct save87 *)fpregs);
2122 #endif /* CPU_DISABLE_SSE */
2123 bcopy(&lp->lwp_thread->td_pcb->pcb_save.sv_87, fpregs, sizeof *fpregs);
2128 set_fpregs(struct lwp *lp, struct fpreg *fpregs)
2130 #ifndef CPU_DISABLE_SSE
2132 set_fpregs_xmm((struct save87 *)fpregs,
2133 &lp->lwp_thread->td_pcb->pcb_save.sv_xmm);
2136 #endif /* CPU_DISABLE_SSE */
2137 bcopy(fpregs, &lp->lwp_thread->td_pcb->pcb_save.sv_87, sizeof *fpregs);
2142 fill_dbregs(struct lwp *lp, struct dbreg *dbregs)
2145 dbregs->dr[0] = rdr0();
2146 dbregs->dr[1] = rdr1();
2147 dbregs->dr[2] = rdr2();
2148 dbregs->dr[3] = rdr3();
2149 dbregs->dr[4] = rdr4();
2150 dbregs->dr[5] = rdr5();
2151 dbregs->dr[6] = rdr6();
2152 dbregs->dr[7] = rdr7();
2156 pcb = lp->lwp_thread->td_pcb;
2157 dbregs->dr[0] = pcb->pcb_dr0;
2158 dbregs->dr[1] = pcb->pcb_dr1;
2159 dbregs->dr[2] = pcb->pcb_dr2;
2160 dbregs->dr[3] = pcb->pcb_dr3;
2163 dbregs->dr[6] = pcb->pcb_dr6;
2164 dbregs->dr[7] = pcb->pcb_dr7;
2170 set_dbregs(struct lwp *lp, struct dbreg *dbregs)
2173 load_dr0(dbregs->dr[0]);
2174 load_dr1(dbregs->dr[1]);
2175 load_dr2(dbregs->dr[2]);
2176 load_dr3(dbregs->dr[3]);
2177 load_dr4(dbregs->dr[4]);
2178 load_dr5(dbregs->dr[5]);
2179 load_dr6(dbregs->dr[6]);
2180 load_dr7(dbregs->dr[7]);
2183 struct ucred *ucred;
2185 uint64_t mask1, mask2;
2188 * Don't let an illegal value for dr7 get set. Specifically,
2189 * check for undefined settings. Setting these bit patterns
2190 * result in undefined behaviour and can lead to an unexpected
2193 /* JG this loop looks unreadable */
2194 /* Check 4 2-bit fields for invalid patterns.
2195 * These fields are R/Wi, for i = 0..3
2197 /* Is 10 in LENi allowed when running in compatibility mode? */
2198 /* Pattern 10 in R/Wi might be used to indicate
2199 * breakpoint on I/O. Further analysis should be
2200 * carried to decide if it is safe and useful to
2201 * provide access to that capability
2203 for (i = 0, mask1 = 0x3<<16, mask2 = 0x2<<16; i < 4;
2204 i++, mask1 <<= 4, mask2 <<= 4)
2205 if ((dbregs->dr[7] & mask1) == mask2)
2208 pcb = lp->lwp_thread->td_pcb;
2209 ucred = lp->lwp_proc->p_ucred;
2212 * Don't let a process set a breakpoint that is not within the
2213 * process's address space. If a process could do this, it
2214 * could halt the system by setting a breakpoint in the kernel
2215 * (if ddb was enabled). Thus, we need to check to make sure
2216 * that no breakpoints are being enabled for addresses outside
2217 * process's address space, unless, perhaps, we were called by
2220 * XXX - what about when the watched area of the user's
2221 * address space is written into from within the kernel
2222 * ... wouldn't that still cause a breakpoint to be generated
2223 * from within kernel mode?
2226 if (priv_check_cred(ucred, PRIV_ROOT, 0) != 0) {
2227 if (dbregs->dr[7] & 0x3) {
2228 /* dr0 is enabled */
2229 if (dbregs->dr[0] >= VM_MAX_USER_ADDRESS)
2233 if (dbregs->dr[7] & (0x3<<2)) {
2234 /* dr1 is enabled */
2235 if (dbregs->dr[1] >= VM_MAX_USER_ADDRESS)
2239 if (dbregs->dr[7] & (0x3<<4)) {
2240 /* dr2 is enabled */
2241 if (dbregs->dr[2] >= VM_MAX_USER_ADDRESS)
2245 if (dbregs->dr[7] & (0x3<<6)) {
2246 /* dr3 is enabled */
2247 if (dbregs->dr[3] >= VM_MAX_USER_ADDRESS)
2252 pcb->pcb_dr0 = dbregs->dr[0];
2253 pcb->pcb_dr1 = dbregs->dr[1];
2254 pcb->pcb_dr2 = dbregs->dr[2];
2255 pcb->pcb_dr3 = dbregs->dr[3];
2256 pcb->pcb_dr6 = dbregs->dr[6];
2257 pcb->pcb_dr7 = dbregs->dr[7];
2259 pcb->pcb_flags |= PCB_DBREGS;
2266 * Return > 0 if a hardware breakpoint has been hit, and the
2267 * breakpoint was in user space. Return 0, otherwise.
2270 user_dbreg_trap(void)
2272 u_int64_t dr7, dr6; /* debug registers dr6 and dr7 */
2273 u_int64_t bp; /* breakpoint bits extracted from dr6 */
2274 int nbp; /* number of breakpoints that triggered */
2275 caddr_t addr[4]; /* breakpoint addresses */
2279 if ((dr7 & 0xff) == 0) {
2281 * all GE and LE bits in the dr7 register are zero,
2282 * thus the trap couldn't have been caused by the
2283 * hardware debug registers
2294 * None of the breakpoint bits are set meaning this
2295 * trap was not caused by any of the debug registers
2301 * at least one of the breakpoints were hit, check to see
2302 * which ones and if any of them are user space addresses
2306 addr[nbp++] = (caddr_t)rdr0();
2309 addr[nbp++] = (caddr_t)rdr1();
2312 addr[nbp++] = (caddr_t)rdr2();
2315 addr[nbp++] = (caddr_t)rdr3();
2318 for (i=0; i<nbp; i++) {
2320 (caddr_t)VM_MAX_USER_ADDRESS) {
2322 * addr[i] is in user space
2329 * None of the breakpoints are in user space.
2337 Debugger(const char *msg)
2339 kprintf("Debugger(\"%s\") called.\n", msg);
2346 * Provide inb() and outb() as functions. They are normally only
2347 * available as macros calling inlined functions, thus cannot be
2348 * called inside DDB.
2350 * The actual code is stolen from <machine/cpufunc.h>, and de-inlined.
2356 /* silence compiler warnings */
2358 void outb(u_int, u_char);
2365 * We use %%dx and not %1 here because i/o is done at %dx and not at
2366 * %edx, while gcc generates inferior code (movw instead of movl)
2367 * if we tell it to load (u_short) port.
2369 __asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port));
2374 outb(u_int port, u_char data)
2378 * Use an unnecessary assignment to help gcc's register allocator.
2379 * This make a large difference for gcc-1.40 and a tiny difference
2380 * for gcc-2.6.0. For gcc-1.40, al had to be ``asm("ax")'' for
2381 * best results. gcc-2.6.0 can't handle this.
2384 __asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port));
2391 #include "opt_cpu.h"
2395 * initialize all the SMP locks
2398 /* critical region when masking or unmasking interupts */
2399 struct spinlock_deprecated imen_spinlock;
2401 /* critical region for old style disable_intr/enable_intr */
2402 struct spinlock_deprecated mpintr_spinlock;
2404 /* critical region around INTR() routines */
2405 struct spinlock_deprecated intr_spinlock;
2407 /* lock region used by kernel profiling */
2408 struct spinlock_deprecated mcount_spinlock;
2410 /* locks com (tty) data/hardware accesses: a FASTINTR() */
2411 struct spinlock_deprecated com_spinlock;
2413 /* lock regions around the clock hardware */
2414 struct spinlock_deprecated clock_spinlock;
2421 * Get the initial mplock with a count of 1 for the BSP.
2422 * This uses a LOGICAL cpu ID, ie BSP == 0.
2424 cpu_get_initial_mplock();
2427 spin_lock_init(&mcount_spinlock);
2428 spin_lock_init(&intr_spinlock);
2429 spin_lock_init(&mpintr_spinlock);
2430 spin_lock_init(&imen_spinlock);
2431 spin_lock_init(&com_spinlock);
2432 spin_lock_init(&clock_spinlock);
2434 /* our token pool needs to work early */
2435 lwkt_token_pool_init();