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_ether.h"
44 //#include "use_npx.h"
46 #include "opt_atalk.h"
47 #include "opt_compat.h"
50 #include "opt_directio.h"
53 #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>
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>
113 #include <bus/isa/isa_device.h>
115 #include <machine_base/isa/intr_machdep.h>
116 #include <bus/isa/rtc.h>
117 #include <sys/random.h>
118 #include <sys/ptrace.h>
119 #include <machine/sigframe.h>
121 #define PHYSMAP_ENTRIES 10
123 extern void init386(int first);
124 extern void dblfault_handler(void);
125 extern u_int64_t hammer_time(u_int64_t, u_int64_t);
127 extern void printcpuinfo(void); /* XXX header file */
128 extern void identify_cpu(void);
130 extern void finishidentcpu(void);
132 extern void panicifcpuunsupported(void);
134 static void cpu_startup(void *);
135 #ifndef CPU_DISABLE_SSE
136 static void set_fpregs_xmm(struct save87 *, struct savexmm *);
137 static void fill_fpregs_xmm(struct savexmm *, struct save87 *);
138 #endif /* CPU_DISABLE_SSE */
140 extern void ffs_rawread_setup(void);
141 #endif /* DIRECTIO */
142 static void init_locks(void);
144 SYSINIT(cpu, SI_BOOT2_SMP, SI_ORDER_FIRST, cpu_startup, NULL)
147 extern vm_offset_t ksym_start, ksym_end;
155 struct privatespace CPU_prvspace[MAXCPU];
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, "");
176 sysctl_hw_physmem(SYSCTL_HANDLER_ARGS)
178 int error = sysctl_handle_int(oidp, 0, ctob(physmem), req);
182 SYSCTL_PROC(_hw, HW_PHYSMEM, physmem, CTLTYPE_INT|CTLFLAG_RD,
183 0, 0, sysctl_hw_physmem, "IU", "");
186 sysctl_hw_usermem(SYSCTL_HANDLER_ARGS)
188 int error = sysctl_handle_int(oidp, 0,
189 ctob(physmem - vmstats.v_wire_count), req);
193 SYSCTL_PROC(_hw, HW_USERMEM, usermem, CTLTYPE_INT|CTLFLAG_RD,
194 0, 0, sysctl_hw_usermem, "IU", "");
197 sysctl_hw_availpages(SYSCTL_HANDLER_ARGS)
199 int error = sysctl_handle_int(oidp, 0,
200 x86_64_btop(avail_end - avail_start), req);
204 SYSCTL_PROC(_hw, OID_AUTO, availpages, CTLTYPE_INT|CTLFLAG_RD,
205 0, 0, sysctl_hw_availpages, "I", "");
207 vm_paddr_t Maxmem = 0;
210 * The number of PHYSMAP entries must be one less than the number of
211 * PHYSSEG entries because the PHYSMAP entry that spans the largest
212 * physical address that is accessible by ISA DMA is split into two
215 #define PHYSMAP_SIZE (2 * (VM_PHYSSEG_MAX - 1))
217 vm_paddr_t phys_avail[PHYSMAP_SIZE + 2];
218 vm_paddr_t dump_avail[PHYSMAP_SIZE + 2];
220 /* must be 2 less so 0 0 can signal end of chunks */
221 #define PHYS_AVAIL_ARRAY_END ((sizeof(phys_avail) / sizeof(phys_avail[0])) - 2)
222 #define DUMP_AVAIL_ARRAY_END ((sizeof(dump_avail) / sizeof(dump_avail[0])) - 2)
224 static vm_offset_t buffer_sva, buffer_eva;
225 vm_offset_t clean_sva, clean_eva;
226 static vm_offset_t pager_sva, pager_eva;
227 static struct trapframe proc0_tf;
230 cpu_startup(void *dummy)
234 vm_offset_t firstaddr;
236 if (boothowto & RB_VERBOSE)
240 * Good {morning,afternoon,evening,night}.
242 kprintf("%s", version);
245 panicifcpuunsupported();
249 kprintf("real memory = %ju (%juK bytes)\n",
250 (intmax_t)ptoa(Maxmem),
251 (intmax_t)ptoa(Maxmem) / 1024);
253 * Display any holes after the first chunk of extended memory.
258 kprintf("Physical memory chunk(s):\n");
259 for (indx = 0; phys_avail[indx + 1] != 0; indx += 2) {
260 vm_paddr_t size1 = phys_avail[indx + 1] - phys_avail[indx];
262 kprintf("0x%08jx - 0x%08jx, %ju bytes (%ju pages)\n",
263 (intmax_t)phys_avail[indx],
264 (intmax_t)phys_avail[indx + 1] - 1,
266 (intmax_t)(size1 / PAGE_SIZE));
271 * Allocate space for system data structures.
272 * The first available kernel virtual address is in "v".
273 * As pages of kernel virtual memory are allocated, "v" is incremented.
274 * As pages of memory are allocated and cleared,
275 * "firstaddr" is incremented.
276 * An index into the kernel page table corresponding to the
277 * virtual memory address maintained in "v" is kept in "mapaddr".
281 * Make two passes. The first pass calculates how much memory is
282 * needed and allocates it. The second pass assigns virtual
283 * addresses to the various data structures.
287 v = (caddr_t)firstaddr;
289 #define valloc(name, type, num) \
290 (name) = (type *)v; v = (caddr_t)((name)+(num))
291 #define valloclim(name, type, num, lim) \
292 (name) = (type *)v; v = (caddr_t)((lim) = ((name)+(num)))
295 * The nominal buffer size (and minimum KVA allocation) is BKVASIZE.
296 * For the first 64MB of ram nominally allocate sufficient buffers to
297 * cover 1/4 of our ram. Beyond the first 64MB allocate additional
298 * buffers to cover 1/20 of our ram over 64MB. When auto-sizing
299 * the buffer cache we limit the eventual kva reservation to
302 * factor represents the 1/4 x ram conversion.
305 int factor = 4 * BKVASIZE / 1024;
306 int kbytes = physmem * (PAGE_SIZE / 1024);
310 nbuf += min((kbytes - 4096) / factor, 65536 / factor);
312 nbuf += (kbytes - 65536) * 2 / (factor * 5);
313 if (maxbcache && nbuf > maxbcache / BKVASIZE)
314 nbuf = maxbcache / BKVASIZE;
318 * Do not allow the buffer_map to be more then 1/2 the size of the
321 if (nbuf > (virtual_end - virtual_start) / (BKVASIZE * 2)) {
322 nbuf = (virtual_end - virtual_start) / (BKVASIZE * 2);
323 kprintf("Warning: nbufs capped at %d\n", nbuf);
326 nswbuf = max(min(nbuf/4, 256), 16);
328 if (nswbuf < NSWBUF_MIN)
335 valloc(swbuf, struct buf, nswbuf);
336 valloc(buf, struct buf, nbuf);
339 * End of first pass, size has been calculated so allocate memory
341 if (firstaddr == 0) {
342 size = (vm_size_t)(v - firstaddr);
343 firstaddr = kmem_alloc(&kernel_map, round_page(size));
345 panic("startup: no room for tables");
350 * End of second pass, addresses have been assigned
352 if ((vm_size_t)(v - firstaddr) != size)
353 panic("startup: table size inconsistency");
355 kmem_suballoc(&kernel_map, &clean_map, &clean_sva, &clean_eva,
356 (nbuf*BKVASIZE) + (nswbuf*MAXPHYS) + pager_map_size);
357 kmem_suballoc(&clean_map, &buffer_map, &buffer_sva, &buffer_eva,
359 buffer_map.system_map = 1;
360 kmem_suballoc(&clean_map, &pager_map, &pager_sva, &pager_eva,
361 (nswbuf*MAXPHYS) + pager_map_size);
362 pager_map.system_map = 1;
364 #if defined(USERCONFIG)
366 cninit(); /* the preferred console may have changed */
369 kprintf("avail memory = %lu (%luK bytes)\n",
370 ptoa(vmstats.v_free_count),
371 ptoa(vmstats.v_free_count) / 1024);
374 * Set up buffers, so they can be used to read disk labels.
377 vm_pager_bufferinit();
381 * OK, enough kmem_alloc/malloc state should be up, lets get on with it!
383 mp_start(); /* fire up the APs and APICs */
390 * Send an interrupt to process.
392 * Stack is set up to allow sigcode stored
393 * at top to call routine, followed by kcall
394 * to sigreturn routine below. After sigreturn
395 * resets the signal mask, the stack, and the
396 * frame pointer, it returns to the user
400 sendsig(sig_t catcher, int sig, sigset_t *mask, u_long code)
402 struct lwp *lp = curthread->td_lwp;
403 struct proc *p = lp->lwp_proc;
404 struct trapframe *regs;
405 struct sigacts *psp = p->p_sigacts;
406 struct sigframe sf, *sfp;
410 regs = lp->lwp_md.md_regs;
411 oonstack = (lp->lwp_sigstk.ss_flags & SS_ONSTACK) ? 1 : 0;
413 /* Save user context */
414 bzero(&sf, sizeof(struct sigframe));
415 sf.sf_uc.uc_sigmask = *mask;
416 sf.sf_uc.uc_stack = lp->lwp_sigstk;
417 sf.sf_uc.uc_mcontext.mc_onstack = oonstack;
418 KKASSERT(__offsetof(struct trapframe, tf_rdi) == 0);
419 bcopy(regs, &sf.sf_uc.uc_mcontext.mc_rdi, sizeof(struct trapframe));
421 /* Make the size of the saved context visible to userland */
422 sf.sf_uc.uc_mcontext.mc_len = sizeof(sf.sf_uc.uc_mcontext);
424 /* Save mailbox pending state for syscall interlock semantics */
425 if (p->p_flag & P_MAILBOX)
426 sf.sf_uc.uc_mcontext.mc_xflags |= PGEX_MAILBOX;
428 /* Allocate and validate space for the signal handler context. */
429 if ((lp->lwp_flag & LWP_ALTSTACK) != 0 && !oonstack &&
430 SIGISMEMBER(psp->ps_sigonstack, sig)) {
431 sp = (char *)(lp->lwp_sigstk.ss_sp + lp->lwp_sigstk.ss_size -
432 sizeof(struct sigframe));
433 lp->lwp_sigstk.ss_flags |= SS_ONSTACK;
435 /* We take red zone into account */
436 sp = (char *)regs->tf_rsp - sizeof(struct sigframe) - 128;
439 /* Align to 16 bytes */
440 sfp = (struct sigframe *)((intptr_t)sp & ~0xFUL);
442 /* Translate the signal is appropriate */
443 if (p->p_sysent->sv_sigtbl) {
444 if (sig <= p->p_sysent->sv_sigsize)
445 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)];
449 * Build the argument list for the signal handler.
451 * Arguments are in registers (%rdi, %rsi, %rdx, %rcx)
453 regs->tf_rdi = sig; /* argument 1 */
454 regs->tf_rdx = (register_t)&sfp->sf_uc; /* argument 3 */
456 if (SIGISMEMBER(psp->ps_siginfo, sig)) {
458 * Signal handler installed with SA_SIGINFO.
460 * action(signo, siginfo, ucontext)
462 regs->tf_rsi = (register_t)&sfp->sf_si; /* argument 2 */
463 regs->tf_rcx = (register_t)regs->tf_err; /* argument 4 */
464 sf.sf_ahu.sf_action = (__siginfohandler_t *)catcher;
466 /* fill siginfo structure */
467 sf.sf_si.si_signo = sig;
468 sf.sf_si.si_code = code;
469 sf.sf_si.si_addr = (void *)regs->tf_err;
472 * Old FreeBSD-style arguments.
474 * handler (signo, code, [uc], addr)
476 regs->tf_rsi = (register_t)code; /* argument 2 */
477 regs->tf_rcx = (register_t)regs->tf_err; /* argument 4 */
478 sf.sf_ahu.sf_handler = catcher;
482 * If we're a vm86 process, we want to save the segment registers.
483 * We also change eflags to be our emulated eflags, not the actual
487 if (regs->tf_eflags & PSL_VM) {
488 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs;
489 struct vm86_kernel *vm86 = &lp->lwp_thread->td_pcb->pcb_ext->ext_vm86;
491 sf.sf_uc.uc_mcontext.mc_gs = tf->tf_vm86_gs;
492 sf.sf_uc.uc_mcontext.mc_fs = tf->tf_vm86_fs;
493 sf.sf_uc.uc_mcontext.mc_es = tf->tf_vm86_es;
494 sf.sf_uc.uc_mcontext.mc_ds = tf->tf_vm86_ds;
496 if (vm86->vm86_has_vme == 0)
497 sf.sf_uc.uc_mcontext.mc_eflags =
498 (tf->tf_eflags & ~(PSL_VIF | PSL_VIP)) |
499 (vm86->vm86_eflags & (PSL_VIF | PSL_VIP));
502 * Clear PSL_NT to inhibit T_TSSFLT faults on return from
503 * syscalls made by the signal handler. This just avoids
504 * wasting time for our lazy fixup of such faults. PSL_NT
505 * does nothing in vm86 mode, but vm86 programs can set it
506 * almost legitimately in probes for old cpu types.
508 tf->tf_eflags &= ~(PSL_VM | PSL_NT | PSL_VIF | PSL_VIP);
513 * Save the FPU state and reinit the FP unit
515 npxpush(&sf.sf_uc.uc_mcontext);
518 * Copy the sigframe out to the user's stack.
520 if (copyout(&sf, sfp, sizeof(struct sigframe)) != 0) {
522 * Something is wrong with the stack pointer.
523 * ...Kill the process.
528 regs->tf_rsp = (register_t)sfp;
529 regs->tf_rip = PS_STRINGS - *(p->p_sysent->sv_szsigcode);
532 * i386 abi specifies that the direction flag must be cleared
535 regs->tf_rflags &= ~(PSL_T|PSL_D);
538 * 64 bit mode has a code and stack selector but
539 * no data or extra selector. %fs and %gs are not
542 regs->tf_cs = _ucodesel;
543 regs->tf_ss = _udatasel;
547 * Sanitize the trapframe for a virtual kernel passing control to a custom
548 * VM context. Remove any items that would otherwise create a privilage
551 * XXX at the moment we allow userland to set the resume flag. Is this a
555 cpu_sanitize_frame(struct trapframe *frame)
557 frame->tf_cs = _ucodesel;
558 frame->tf_ss = _udatasel;
559 /* XXX VM (8086) mode not supported? */
560 frame->tf_rflags &= (PSL_RF | PSL_USERCHANGE | PSL_VM_UNSUPP);
561 frame->tf_rflags |= PSL_RESERVED_DEFAULT | PSL_I;
567 * Sanitize the tls so loading the descriptor does not blow up
568 * on us. For x86_64 we don't have to do anything.
571 cpu_sanitize_tls(struct savetls *tls)
577 * sigreturn(ucontext_t *sigcntxp)
579 * System call to cleanup state after a signal
580 * has been taken. Reset signal mask and
581 * stack state from context left by sendsig (above).
582 * Return to previous pc and psl as specified by
583 * context left by sendsig. Check carefully to
584 * make sure that the user has not modified the
585 * state to gain improper privileges.
589 #define EFL_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0)
590 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL)
593 sys_sigreturn(struct sigreturn_args *uap)
595 struct lwp *lp = curthread->td_lwp;
596 struct proc *p = lp->lwp_proc;
597 struct trapframe *regs;
605 * We have to copy the information into kernel space so userland
606 * can't modify it while we are sniffing it.
608 regs = lp->lwp_md.md_regs;
609 error = copyin(uap->sigcntxp, &uc, sizeof(uc));
613 rflags = ucp->uc_mcontext.mc_rflags;
615 /* VM (8086) mode not supported */
616 rflags &= ~PSL_VM_UNSUPP;
619 if (eflags & PSL_VM) {
620 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs;
621 struct vm86_kernel *vm86;
624 * if pcb_ext == 0 or vm86_inited == 0, the user hasn't
625 * set up the vm86 area, and we can't enter vm86 mode.
627 if (lp->lwp_thread->td_pcb->pcb_ext == 0)
629 vm86 = &lp->lwp_thread->td_pcb->pcb_ext->ext_vm86;
630 if (vm86->vm86_inited == 0)
633 /* go back to user mode if both flags are set */
634 if ((eflags & PSL_VIP) && (eflags & PSL_VIF))
635 trapsignal(lp, SIGBUS, 0);
637 if (vm86->vm86_has_vme) {
638 eflags = (tf->tf_eflags & ~VME_USERCHANGE) |
639 (eflags & VME_USERCHANGE) | PSL_VM;
641 vm86->vm86_eflags = eflags; /* save VIF, VIP */
642 eflags = (tf->tf_eflags & ~VM_USERCHANGE) |
643 (eflags & VM_USERCHANGE) | PSL_VM;
645 bcopy(&ucp->uc_mcontext.mc_gs, tf, sizeof(struct trapframe));
646 tf->tf_eflags = eflags;
647 tf->tf_vm86_ds = tf->tf_ds;
648 tf->tf_vm86_es = tf->tf_es;
649 tf->tf_vm86_fs = tf->tf_fs;
650 tf->tf_vm86_gs = tf->tf_gs;
651 tf->tf_ds = _udatasel;
652 tf->tf_es = _udatasel;
653 tf->tf_fs = _udatasel;
654 tf->tf_gs = _udatasel;
659 * Don't allow users to change privileged or reserved flags.
662 * XXX do allow users to change the privileged flag PSL_RF.
663 * The cpu sets PSL_RF in tf_eflags for faults. Debuggers
664 * should sometimes set it there too. tf_eflags is kept in
665 * the signal context during signal handling and there is no
666 * other place to remember it, so the PSL_RF bit may be
667 * corrupted by the signal handler without us knowing.
668 * Corruption of the PSL_RF bit at worst causes one more or
669 * one less debugger trap, so allowing it is fairly harmless.
671 if (!EFL_SECURE(rflags & ~PSL_RF, regs->tf_rflags & ~PSL_RF)) {
672 kprintf("sigreturn: rflags = 0x%lx\n", (long)rflags);
677 * Don't allow users to load a valid privileged %cs. Let the
678 * hardware check for invalid selectors, excess privilege in
679 * other selectors, invalid %eip's and invalid %esp's.
681 cs = ucp->uc_mcontext.mc_cs;
682 if (!CS_SECURE(cs)) {
683 kprintf("sigreturn: cs = 0x%x\n", cs);
684 trapsignal(lp, SIGBUS, T_PROTFLT);
687 bcopy(&ucp->uc_mcontext.mc_rdi, regs, sizeof(struct trapframe));
691 * Restore the FPU state from the frame
694 npxpop(&ucp->uc_mcontext);
697 * Merge saved signal mailbox pending flag to maintain interlock
698 * semantics against system calls.
700 if (ucp->uc_mcontext.mc_xflags & PGEX_MAILBOX)
701 p->p_flag |= P_MAILBOX;
703 if (ucp->uc_mcontext.mc_onstack & 1)
704 lp->lwp_sigstk.ss_flags |= SS_ONSTACK;
706 lp->lwp_sigstk.ss_flags &= ~SS_ONSTACK;
708 lp->lwp_sigmask = ucp->uc_sigmask;
709 SIG_CANTMASK(lp->lwp_sigmask);
715 * Stack frame on entry to function. %rax will contain the function vector,
716 * %rcx will contain the function data. flags, rcx, and rax will have
717 * already been pushed on the stack.
728 sendupcall(struct vmupcall *vu, int morepending)
730 struct lwp *lp = curthread->td_lwp;
731 struct trapframe *regs;
732 struct upcall upcall;
733 struct upc_frame upc_frame;
737 * If we are a virtual kernel running an emulated user process
738 * context, switch back to the virtual kernel context before
739 * trying to post the signal.
741 if (lp->lwp_vkernel && lp->lwp_vkernel->ve) {
742 lp->lwp_md.md_regs->tf_trapno = 0;
743 vkernel_trap(lp, lp->lwp_md.md_regs);
747 * Get the upcall data structure
749 if (copyin(lp->lwp_upcall, &upcall, sizeof(upcall)) ||
750 copyin((char *)upcall.upc_uthread + upcall.upc_critoff, &crit_count, sizeof(int))
753 kprintf("bad upcall address\n");
758 * If the data structure is already marked pending or has a critical
759 * section count, mark the data structure as pending and return
760 * without doing an upcall. vu_pending is left set.
762 if (upcall.upc_pending || crit_count >= vu->vu_pending) {
763 if (upcall.upc_pending < vu->vu_pending) {
764 upcall.upc_pending = vu->vu_pending;
765 copyout(&upcall.upc_pending, &lp->lwp_upcall->upc_pending,
766 sizeof(upcall.upc_pending));
772 * We can run this upcall now, clear vu_pending.
774 * Bump our critical section count and set or clear the
775 * user pending flag depending on whether more upcalls are
776 * pending. The user will be responsible for calling
777 * upc_dispatch(-1) to process remaining upcalls.
780 upcall.upc_pending = morepending;
781 crit_count += TDPRI_CRIT;
782 copyout(&upcall.upc_pending, &lp->lwp_upcall->upc_pending,
783 sizeof(upcall.upc_pending));
784 copyout(&crit_count, (char *)upcall.upc_uthread + upcall.upc_critoff,
788 * Construct a stack frame and issue the upcall
790 regs = lp->lwp_md.md_regs;
791 upc_frame.rax = regs->tf_rax;
792 upc_frame.rcx = regs->tf_rcx;
793 upc_frame.rdx = regs->tf_rdx;
794 upc_frame.flags = regs->tf_rflags;
795 upc_frame.oldip = regs->tf_rip;
796 if (copyout(&upc_frame, (void *)(regs->tf_rsp - sizeof(upc_frame)),
797 sizeof(upc_frame)) != 0) {
798 kprintf("bad stack on upcall\n");
800 regs->tf_rax = (register_t)vu->vu_func;
801 regs->tf_rcx = (register_t)vu->vu_data;
802 regs->tf_rdx = (register_t)lp->lwp_upcall;
803 regs->tf_rip = (register_t)vu->vu_ctx;
804 regs->tf_rsp -= sizeof(upc_frame);
809 * fetchupcall occurs in the context of a system call, which means that
810 * we have to return EJUSTRETURN in order to prevent eax and edx from
811 * being overwritten by the syscall return value.
813 * if vu is not NULL we return the new context in %edx, the new data in %ecx,
814 * and the function pointer in %eax.
817 fetchupcall(struct vmupcall *vu, int morepending, void *rsp)
819 struct upc_frame upc_frame;
820 struct lwp *lp = curthread->td_lwp;
821 struct trapframe *regs;
823 struct upcall upcall;
826 regs = lp->lwp_md.md_regs;
828 error = copyout(&morepending, &lp->lwp_upcall->upc_pending, sizeof(int));
832 * This jumps us to the next ready context.
835 error = copyin(lp->lwp_upcall, &upcall, sizeof(upcall));
838 error = copyin((char *)upcall.upc_uthread + upcall.upc_critoff, &crit_count, sizeof(int));
839 crit_count += TDPRI_CRIT;
841 error = copyout(&crit_count, (char *)upcall.upc_uthread + upcall.upc_critoff, sizeof(int));
842 regs->tf_rax = (register_t)vu->vu_func;
843 regs->tf_rcx = (register_t)vu->vu_data;
844 regs->tf_rdx = (register_t)lp->lwp_upcall;
845 regs->tf_rip = (register_t)vu->vu_ctx;
846 regs->tf_rsp = (register_t)rsp;
849 * This returns us to the originally interrupted code.
851 error = copyin(rsp, &upc_frame, sizeof(upc_frame));
852 regs->tf_rax = upc_frame.rax;
853 regs->tf_rcx = upc_frame.rcx;
854 regs->tf_rdx = upc_frame.rdx;
855 regs->tf_rflags = (regs->tf_rflags & ~PSL_USERCHANGE) |
856 (upc_frame.flags & PSL_USERCHANGE);
857 regs->tf_rip = upc_frame.oldip;
858 regs->tf_rsp = (register_t)((char *)rsp + sizeof(upc_frame));
867 * Machine dependent boot() routine
869 * I haven't seen anything to put here yet
870 * Possibly some stuff might be grafted back here from boot()
878 * Shutdown the CPU as much as possible
884 __asm__ __volatile("hlt");
888 * cpu_idle() represents the idle LWKT. You cannot return from this function
889 * (unless you want to blow things up!). Instead we look for runnable threads
890 * and loop or halt as appropriate. Giant is not held on entry to the thread.
892 * The main loop is entered with a critical section held, we must release
893 * the critical section before doing anything else. lwkt_switch() will
894 * check for pending interrupts due to entering and exiting its own
897 * Note on cpu_idle_hlt: On an SMP system we rely on a scheduler IPI
898 * to wake a HLTed cpu up. However, there are cases where the idlethread
899 * will be entered with the possibility that no IPI will occur and in such
900 * cases lwkt_switch() sets TDF_IDLE_NOHLT.
902 static int cpu_idle_hlt = 1;
903 static int cpu_idle_hltcnt;
904 static int cpu_idle_spincnt;
905 SYSCTL_INT(_machdep, OID_AUTO, cpu_idle_hlt, CTLFLAG_RW,
906 &cpu_idle_hlt, 0, "Idle loop HLT enable");
907 SYSCTL_INT(_machdep, OID_AUTO, cpu_idle_hltcnt, CTLFLAG_RW,
908 &cpu_idle_hltcnt, 0, "Idle loop entry halts");
909 SYSCTL_INT(_machdep, OID_AUTO, cpu_idle_spincnt, CTLFLAG_RW,
910 &cpu_idle_spincnt, 0, "Idle loop entry spins");
913 cpu_idle_default_hook(void)
916 * We must guarentee that hlt is exactly the instruction
919 __asm __volatile("sti; hlt");
922 /* Other subsystems (e.g., ACPI) can hook this later. */
923 void (*cpu_idle_hook)(void) = cpu_idle_default_hook;
928 struct thread *td = curthread;
931 KKASSERT(td->td_pri < TDPRI_CRIT);
934 * See if there are any LWKTs ready to go.
939 * If we are going to halt call splz unconditionally after
940 * CLIing to catch any interrupt races. Note that we are
941 * at SPL0 and interrupts are enabled.
943 if (cpu_idle_hlt && !lwkt_runnable() &&
944 (td->td_flags & TDF_IDLE_NOHLT) == 0) {
945 __asm __volatile("cli");
947 if (!lwkt_runnable())
951 __asm __volatile("pause");
955 td->td_flags &= ~TDF_IDLE_NOHLT;
958 __asm __volatile("sti; pause");
960 __asm __volatile("sti");
968 * This routine is called when the only runnable threads require
969 * the MP lock, and the scheduler couldn't get it. On a real cpu
970 * we let the scheduler spin.
973 cpu_mplock_contested(void)
979 * This routine is called if a spinlock has been held through the
980 * exponential backoff period and is seriously contested. On a real cpu
984 cpu_spinlock_contested(void)
990 * Clear registers on exec
993 exec_setregs(u_long entry, u_long stack, u_long ps_strings)
995 struct thread *td = curthread;
996 struct lwp *lp = td->td_lwp;
997 struct pcb *pcb = td->td_pcb;
998 struct trapframe *regs = lp->lwp_md.md_regs;
1000 /* was i386_user_cleanup() in NetBSD */
1003 bzero((char *)regs, sizeof(struct trapframe));
1004 regs->tf_rip = entry;
1005 regs->tf_rsp = ((stack - 8) & ~0xFul) + 8; /* align the stack */
1006 regs->tf_rdi = stack; /* argv */
1007 regs->tf_rflags = PSL_USER | (regs->tf_rflags & PSL_T);
1008 regs->tf_ss = _udatasel;
1009 regs->tf_cs = _ucodesel;
1010 regs->tf_rbx = ps_strings;
1013 * Reset the hardware debug registers if they were in use.
1014 * They won't have any meaning for the newly exec'd process.
1016 if (pcb->pcb_flags & PCB_DBREGS) {
1022 pcb->pcb_dr7 = 0; /* JG set bit 10? */
1023 if (pcb == td->td_pcb) {
1025 * Clear the debug registers on the running
1026 * CPU, otherwise they will end up affecting
1027 * the next process we switch to.
1031 pcb->pcb_flags &= ~PCB_DBREGS;
1035 * Initialize the math emulator (if any) for the current process.
1036 * Actually, just clear the bit that says that the emulator has
1037 * been initialized. Initialization is delayed until the process
1038 * traps to the emulator (if it is done at all) mainly because
1039 * emulators don't provide an entry point for initialization.
1041 pcb->pcb_flags &= ~FP_SOFTFP;
1044 * NOTE: do not set CR0_TS here. npxinit() must do it after clearing
1045 * gd_npxthread. Otherwise a preemptive interrupt thread
1046 * may panic in npxdna().
1049 load_cr0(rcr0() | CR0_MP);
1052 * NOTE: The MSR values must be correct so we can return to
1053 * userland. gd_user_fs/gs must be correct so the switch
1054 * code knows what the current MSR values are.
1056 pcb->pcb_fsbase = 0; /* Values loaded from PCB on switch */
1057 pcb->pcb_gsbase = 0;
1058 mdcpu->gd_user_fs = 0; /* Cache of current MSR values */
1059 mdcpu->gd_user_gs = 0;
1060 wrmsr(MSR_FSBASE, 0); /* Set MSR values for return to userland */
1061 wrmsr(MSR_KGSBASE, 0);
1063 /* Initialize the npx (if any) for the current process. */
1064 npxinit(__INITIAL_NPXCW__);
1067 pcb->pcb_ds = _udatasel;
1068 pcb->pcb_es = _udatasel;
1069 pcb->pcb_fs = _udatasel;
1070 pcb->pcb_gs = _udatasel;
1079 cr0 |= CR0_NE; /* Done by npxinit() */
1080 cr0 |= CR0_MP | CR0_TS; /* Done at every execve() too. */
1081 cr0 |= CR0_WP | CR0_AM;
1087 sysctl_machdep_adjkerntz(SYSCTL_HANDLER_ARGS)
1090 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2,
1092 if (!error && req->newptr)
1097 SYSCTL_PROC(_machdep, CPU_ADJKERNTZ, adjkerntz, CTLTYPE_INT|CTLFLAG_RW,
1098 &adjkerntz, 0, sysctl_machdep_adjkerntz, "I", "");
1101 SYSCTL_INT(_machdep, CPU_DISRTCSET, disable_rtc_set,
1102 CTLFLAG_RW, &disable_rtc_set, 0, "");
1106 SYSCTL_STRUCT(_machdep, CPU_BOOTINFO, bootinfo,
1107 CTLFLAG_RD, &bootinfo, bootinfo, "");
1110 SYSCTL_INT(_machdep, CPU_WALLCLOCK, wall_cmos_clock,
1111 CTLFLAG_RW, &wall_cmos_clock, 0, "");
1113 extern u_long bootdev; /* not a cdev_t - encoding is different */
1114 SYSCTL_ULONG(_machdep, OID_AUTO, guessed_bootdev,
1115 CTLFLAG_RD, &bootdev, 0, "Boot device (not in cdev_t format)");
1118 * Initialize 386 and configure to run kernel
1122 * Initialize segments & interrupt table
1126 struct user_segment_descriptor gdt[NGDT * MAXCPU]; /* global descriptor table */
1127 static struct gate_descriptor idt0[NIDT];
1128 struct gate_descriptor *idt = &idt0[0]; /* interrupt descriptor table */
1130 union descriptor ldt[NLDT]; /* local descriptor table */
1133 /* table descriptors - used to load tables by cpu */
1134 struct region_descriptor r_gdt, r_idt;
1136 #if defined(I586_CPU) && !defined(NO_F00F_HACK)
1137 extern int has_f00f_bug;
1140 static char dblfault_stack[PAGE_SIZE] __aligned(16);
1142 /* JG proc0paddr is a virtual address */
1145 char proc0paddr_buff[LWKT_THREAD_STACK];
1148 /* software prototypes -- in more palatable form */
1149 struct soft_segment_descriptor gdt_segs[] = {
1150 /* GNULL_SEL 0 Null Descriptor */
1151 { 0x0, /* segment base address */
1153 0, /* segment type */
1154 0, /* segment descriptor priority level */
1155 0, /* segment descriptor present */
1157 0, /* default 32 vs 16 bit size */
1158 0 /* limit granularity (byte/page units)*/ },
1159 /* GCODE_SEL 1 Code Descriptor for kernel */
1160 { 0x0, /* segment base address */
1161 0xfffff, /* length - all address space */
1162 SDT_MEMERA, /* segment type */
1163 SEL_KPL, /* segment descriptor priority level */
1164 1, /* segment descriptor present */
1166 0, /* default 32 vs 16 bit size */
1167 1 /* limit granularity (byte/page units)*/ },
1168 /* GDATA_SEL 2 Data Descriptor for kernel */
1169 { 0x0, /* segment base address */
1170 0xfffff, /* length - all address space */
1171 SDT_MEMRWA, /* segment type */
1172 SEL_KPL, /* segment descriptor priority level */
1173 1, /* segment descriptor present */
1175 0, /* default 32 vs 16 bit size */
1176 1 /* limit granularity (byte/page units)*/ },
1177 /* GUCODE32_SEL 3 32 bit Code Descriptor for user */
1178 { 0x0, /* segment base address */
1179 0xfffff, /* length - all address space */
1180 SDT_MEMERA, /* segment type */
1181 SEL_UPL, /* segment descriptor priority level */
1182 1, /* segment descriptor present */
1184 1, /* default 32 vs 16 bit size */
1185 1 /* limit granularity (byte/page units)*/ },
1186 /* GUDATA_SEL 4 32/64 bit Data Descriptor for user */
1187 { 0x0, /* segment base address */
1188 0xfffff, /* length - all address space */
1189 SDT_MEMRWA, /* segment type */
1190 SEL_UPL, /* segment descriptor priority level */
1191 1, /* segment descriptor present */
1193 1, /* default 32 vs 16 bit size */
1194 1 /* limit granularity (byte/page units)*/ },
1195 /* GUCODE_SEL 5 64 bit Code Descriptor for user */
1196 { 0x0, /* segment base address */
1197 0xfffff, /* length - all address space */
1198 SDT_MEMERA, /* segment type */
1199 SEL_UPL, /* 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 /* GPROC0_SEL 6 Proc 0 Tss Descriptor */
1206 0x0, /* segment base address */
1207 sizeof(struct x86_64tss)-1,/* length - all address space */
1208 SDT_SYSTSS, /* segment type */
1209 SEL_KPL, /* segment descriptor priority level */
1210 1, /* segment descriptor present */
1212 0, /* unused - default 32 vs 16 bit size */
1213 0 /* limit granularity (byte/page units)*/ },
1214 /* Actually, the TSS is a system descriptor which is double size */
1215 { 0x0, /* segment base address */
1217 0, /* segment type */
1218 0, /* segment descriptor priority level */
1219 0, /* segment descriptor present */
1221 0, /* default 32 vs 16 bit size */
1222 0 /* limit granularity (byte/page units)*/ },
1223 /* GUGS32_SEL 8 32 bit GS Descriptor for user */
1224 { 0x0, /* segment base address */
1225 0xfffff, /* length - all address space */
1226 SDT_MEMRWA, /* segment type */
1227 SEL_UPL, /* segment descriptor priority level */
1228 1, /* segment descriptor present */
1230 1, /* default 32 vs 16 bit size */
1231 1 /* limit granularity (byte/page units)*/ },
1235 setidt(int idx, inthand_t *func, int typ, int dpl, int ist)
1237 struct gate_descriptor *ip;
1240 ip->gd_looffset = (uintptr_t)func;
1241 ip->gd_selector = GSEL(GCODE_SEL, SEL_KPL);
1247 ip->gd_hioffset = ((uintptr_t)func)>>16 ;
1250 #define IDTVEC(name) __CONCAT(X,name)
1253 IDTVEC(div), IDTVEC(dbg), IDTVEC(nmi), IDTVEC(bpt), IDTVEC(ofl),
1254 IDTVEC(bnd), IDTVEC(ill), IDTVEC(dna), IDTVEC(fpusegm),
1255 IDTVEC(tss), IDTVEC(missing), IDTVEC(stk), IDTVEC(prot),
1256 IDTVEC(page), IDTVEC(mchk), IDTVEC(rsvd), IDTVEC(fpu), IDTVEC(align),
1257 IDTVEC(xmm), IDTVEC(dblfault),
1258 IDTVEC(fast_syscall), IDTVEC(fast_syscall32);
1260 #ifdef DEBUG_INTERRUPTS
1261 extern inthand_t *Xrsvdary[256];
1265 sdtossd(struct user_segment_descriptor *sd, struct soft_segment_descriptor *ssd)
1267 ssd->ssd_base = (sd->sd_hibase << 24) | sd->sd_lobase;
1268 ssd->ssd_limit = (sd->sd_hilimit << 16) | sd->sd_lolimit;
1269 ssd->ssd_type = sd->sd_type;
1270 ssd->ssd_dpl = sd->sd_dpl;
1271 ssd->ssd_p = sd->sd_p;
1272 ssd->ssd_def32 = sd->sd_def32;
1273 ssd->ssd_gran = sd->sd_gran;
1277 ssdtosd(struct soft_segment_descriptor *ssd, struct user_segment_descriptor *sd)
1280 sd->sd_lobase = (ssd->ssd_base) & 0xffffff;
1281 sd->sd_hibase = (ssd->ssd_base >> 24) & 0xff;
1282 sd->sd_lolimit = (ssd->ssd_limit) & 0xffff;
1283 sd->sd_hilimit = (ssd->ssd_limit >> 16) & 0xf;
1284 sd->sd_type = ssd->ssd_type;
1285 sd->sd_dpl = ssd->ssd_dpl;
1286 sd->sd_p = ssd->ssd_p;
1287 sd->sd_long = ssd->ssd_long;
1288 sd->sd_def32 = ssd->ssd_def32;
1289 sd->sd_gran = ssd->ssd_gran;
1293 ssdtosyssd(struct soft_segment_descriptor *ssd,
1294 struct system_segment_descriptor *sd)
1297 sd->sd_lobase = (ssd->ssd_base) & 0xffffff;
1298 sd->sd_hibase = (ssd->ssd_base >> 24) & 0xfffffffffful;
1299 sd->sd_lolimit = (ssd->ssd_limit) & 0xffff;
1300 sd->sd_hilimit = (ssd->ssd_limit >> 16) & 0xf;
1301 sd->sd_type = ssd->ssd_type;
1302 sd->sd_dpl = ssd->ssd_dpl;
1303 sd->sd_p = ssd->ssd_p;
1304 sd->sd_gran = ssd->ssd_gran;
1310 * Populate the (physmap) array with base/bound pairs describing the
1311 * available physical memory in the system, then test this memory and
1312 * build the phys_avail array describing the actually-available memory.
1314 * If we cannot accurately determine the physical memory map, then use
1315 * value from the 0xE801 call, and failing that, the RTC.
1317 * Total memory size may be set by the kernel environment variable
1318 * hw.physmem or the compile-time define MAXMEM.
1320 * XXX first should be vm_paddr_t.
1323 getmemsize(caddr_t kmdp, u_int64_t first)
1325 int i, off, physmap_idx, pa_indx, da_indx;
1326 vm_paddr_t pa, physmap[PHYSMAP_SIZE];
1327 u_long physmem_tunable;
1329 struct bios_smap *smapbase, *smap, *smapend;
1331 quad_t dcons_addr, dcons_size;
1333 bzero(physmap, sizeof(physmap));
1338 * get memory map from INT 15:E820, kindly supplied by the loader.
1340 * subr_module.c says:
1341 * "Consumer may safely assume that size value precedes data."
1342 * ie: an int32_t immediately precedes smap.
1344 smapbase = (struct bios_smap *)preload_search_info(kmdp,
1345 MODINFO_METADATA | MODINFOMD_SMAP);
1346 if (smapbase == NULL)
1347 panic("No BIOS smap info from loader!");
1349 smapsize = *((u_int32_t *)smapbase - 1);
1350 smapend = (struct bios_smap *)((uintptr_t)smapbase + smapsize);
1352 for (smap = smapbase; smap < smapend; smap++) {
1353 if (boothowto & RB_VERBOSE)
1354 kprintf("SMAP type=%02x base=%016lx len=%016lx\n",
1355 smap->type, smap->base, smap->length);
1357 if (smap->type != SMAP_TYPE_MEMORY)
1360 if (smap->length == 0)
1363 for (i = 0; i <= physmap_idx; i += 2) {
1364 if (smap->base < physmap[i + 1]) {
1365 if (boothowto & RB_VERBOSE)
1367 "Overlapping or non-monotonic memory region, ignoring second region\n");
1372 if (smap->base == physmap[physmap_idx + 1]) {
1373 physmap[physmap_idx + 1] += smap->length;
1378 if (physmap_idx == PHYSMAP_SIZE) {
1380 "Too many segments in the physical address map, giving up\n");
1383 physmap[physmap_idx] = smap->base;
1384 physmap[physmap_idx + 1] = smap->base + smap->length;
1388 * Find the 'base memory' segment for SMP
1391 for (i = 0; i <= physmap_idx; i += 2) {
1392 if (physmap[i] == 0x00000000) {
1393 basemem = physmap[i + 1] / 1024;
1398 panic("BIOS smap did not include a basemem segment!");
1401 /* make hole for AP bootstrap code */
1402 physmap[1] = mp_bootaddress(physmap[1] / 1024);
1404 /* look for the MP hardware - needed for apic addresses */
1409 * Maxmem isn't the "maximum memory", it's one larger than the
1410 * highest page of the physical address space. It should be
1411 * called something like "Maxphyspage". We may adjust this
1412 * based on ``hw.physmem'' and the results of the memory test.
1414 Maxmem = atop(physmap[physmap_idx + 1]);
1417 Maxmem = MAXMEM / 4;
1420 if (TUNABLE_ULONG_FETCH("hw.physmem", &physmem_tunable))
1421 Maxmem = atop(physmem_tunable);
1424 * Don't allow MAXMEM or hw.physmem to extend the amount of memory
1427 if (Maxmem > atop(physmap[physmap_idx + 1]))
1428 Maxmem = atop(physmap[physmap_idx + 1]);
1430 if (atop(physmap[physmap_idx + 1]) != Maxmem &&
1431 (boothowto & RB_VERBOSE))
1432 kprintf("Physical memory use set to %ldK\n", Maxmem * 4);
1434 /* call pmap initialization to make new kernel address space */
1435 pmap_bootstrap(&first);
1438 * Size up each available chunk of physical memory.
1440 physmap[0] = PAGE_SIZE; /* mask off page 0 */
1443 phys_avail[pa_indx++] = physmap[0];
1444 phys_avail[pa_indx] = physmap[0];
1445 dump_avail[da_indx] = physmap[0];
1449 * Get dcons buffer address
1451 if (kgetenv_quad("dcons.addr", &dcons_addr) == 0 ||
1452 kgetenv_quad("dcons.size", &dcons_size) == 0)
1456 * physmap is in bytes, so when converting to page boundaries,
1457 * round up the start address and round down the end address.
1459 for (i = 0; i <= physmap_idx; i += 2) {
1462 end = ptoa((vm_paddr_t)Maxmem);
1463 if (physmap[i + 1] < end)
1464 end = trunc_page(physmap[i + 1]);
1465 for (pa = round_page(physmap[i]); pa < end; pa += PAGE_SIZE) {
1466 int tmp, page_bad, full;
1467 int *ptr = (int *)CADDR1;
1471 * block out kernel memory as not available.
1473 if (pa >= 0x100000 && pa < first)
1477 * block out dcons buffer
1480 && pa >= trunc_page(dcons_addr)
1481 && pa < dcons_addr + dcons_size)
1487 * map page into kernel: valid, read/write,non-cacheable
1489 *pte = pa | PG_V | PG_RW | PG_N;
1494 * Test for alternating 1's and 0's
1496 *(volatile int *)ptr = 0xaaaaaaaa;
1497 if (*(volatile int *)ptr != 0xaaaaaaaa)
1500 * Test for alternating 0's and 1's
1502 *(volatile int *)ptr = 0x55555555;
1503 if (*(volatile int *)ptr != 0x55555555)
1508 *(volatile int *)ptr = 0xffffffff;
1509 if (*(volatile int *)ptr != 0xffffffff)
1514 *(volatile int *)ptr = 0x0;
1515 if (*(volatile int *)ptr != 0x0)
1518 * Restore original value.
1523 * Adjust array of valid/good pages.
1525 if (page_bad == TRUE)
1528 * If this good page is a continuation of the
1529 * previous set of good pages, then just increase
1530 * the end pointer. Otherwise start a new chunk.
1531 * Note that "end" points one higher than end,
1532 * making the range >= start and < end.
1533 * If we're also doing a speculative memory
1534 * test and we at or past the end, bump up Maxmem
1535 * so that we keep going. The first bad page
1536 * will terminate the loop.
1538 if (phys_avail[pa_indx] == pa) {
1539 phys_avail[pa_indx] += PAGE_SIZE;
1542 if (pa_indx == PHYS_AVAIL_ARRAY_END) {
1544 "Too many holes in the physical address space, giving up\n");
1549 phys_avail[pa_indx++] = pa; /* start */
1550 phys_avail[pa_indx] = pa + PAGE_SIZE; /* end */
1554 if (dump_avail[da_indx] == pa) {
1555 dump_avail[da_indx] += PAGE_SIZE;
1558 if (da_indx == DUMP_AVAIL_ARRAY_END) {
1562 dump_avail[da_indx++] = pa; /* start */
1563 dump_avail[da_indx] = pa + PAGE_SIZE; /* end */
1575 * The last chunk must contain at least one page plus the message
1576 * buffer to avoid complicating other code (message buffer address
1577 * calculation, etc.).
1579 while (phys_avail[pa_indx - 1] + PAGE_SIZE +
1580 round_page(MSGBUF_SIZE) >= phys_avail[pa_indx]) {
1581 physmem -= atop(phys_avail[pa_indx] - phys_avail[pa_indx - 1]);
1582 phys_avail[pa_indx--] = 0;
1583 phys_avail[pa_indx--] = 0;
1586 Maxmem = atop(phys_avail[pa_indx]);
1588 /* Trim off space for the message buffer. */
1589 phys_avail[pa_indx] -= round_page(MSGBUF_SIZE);
1591 avail_end = phys_avail[pa_indx];
1593 /* Map the message buffer. */
1594 for (off = 0; off < round_page(MSGBUF_SIZE); off += PAGE_SIZE)
1595 pmap_kenter((vm_offset_t)msgbufp + off, phys_avail[pa_indx] +
1608 * 7 Device Not Available (x87)
1610 * 9 Coprocessor Segment overrun (unsupported, reserved)
1612 * 11 Segment not present
1614 * 13 General Protection
1617 * 16 x87 FP Exception pending
1618 * 17 Alignment Check
1620 * 19 SIMD floating point
1622 * 32-255 INTn/external sources
1625 hammer_time(u_int64_t modulep, u_int64_t physfree)
1630 int metadata_missing, off;
1632 struct mdglobaldata *gd;
1638 * This must be done before the first references
1639 * to CPU_prvspace[0] are made.
1641 init_paging(&physfree);
1645 * Prevent lowering of the ipl if we call tsleep() early.
1647 gd = &CPU_prvspace[0].mdglobaldata;
1648 bzero(gd, sizeof(*gd));
1651 * Note: on both UP and SMP curthread must be set non-NULL
1652 * early in the boot sequence because the system assumes
1653 * that 'curthread' is never NULL.
1656 gd->mi.gd_curthread = &thread0;
1657 thread0.td_gd = &gd->mi;
1659 atdevbase = ISA_HOLE_START + PTOV_OFFSET;
1662 metadata_missing = 0;
1663 if (bootinfo.bi_modulep) {
1664 preload_metadata = (caddr_t)bootinfo.bi_modulep + KERNBASE;
1665 preload_bootstrap_relocate(KERNBASE);
1667 metadata_missing = 1;
1669 if (bootinfo.bi_envp)
1670 kern_envp = (caddr_t)bootinfo.bi_envp + KERNBASE;
1673 preload_metadata = (caddr_t)(uintptr_t)(modulep + PTOV_OFFSET);
1674 preload_bootstrap_relocate(PTOV_OFFSET);
1675 kmdp = preload_search_by_type("elf kernel");
1677 kmdp = preload_search_by_type("elf64 kernel");
1678 boothowto = MD_FETCH(kmdp, MODINFOMD_HOWTO, int);
1679 kern_envp = MD_FETCH(kmdp, MODINFOMD_ENVP, char *) + PTOV_OFFSET;
1681 ksym_start = MD_FETCH(kmdp, MODINFOMD_SSYM, uintptr_t);
1682 ksym_end = MD_FETCH(kmdp, MODINFOMD_ESYM, uintptr_t);
1686 * start with one cpu. Note: with one cpu, ncpus2_shift, ncpus2_mask,
1687 * and ncpus_fit_mask remain 0.
1692 /* Init basic tunables, hz etc */
1696 * make gdt memory segments
1698 gdt_segs[GPROC0_SEL].ssd_base =
1699 (uintptr_t) &CPU_prvspace[0].mdglobaldata.gd_common_tss;
1701 gd->mi.gd_prvspace = &CPU_prvspace[0];
1703 for (x = 0; x < NGDT; x++) {
1704 if (x != GPROC0_SEL && x != (GPROC0_SEL + 1))
1705 ssdtosd(&gdt_segs[x], &gdt[x]);
1707 ssdtosyssd(&gdt_segs[GPROC0_SEL],
1708 (struct system_segment_descriptor *)&gdt[GPROC0_SEL]);
1710 r_gdt.rd_limit = NGDT * sizeof(gdt[0]) - 1;
1711 r_gdt.rd_base = (long) gdt;
1714 wrmsr(MSR_FSBASE, 0); /* User value */
1715 wrmsr(MSR_GSBASE, (u_int64_t)&gd->mi);
1716 wrmsr(MSR_KGSBASE, 0); /* User value while in the kernel */
1718 mi_gdinit(&gd->mi, 0);
1720 proc0paddr = proc0paddr_buff;
1721 mi_proc0init(&gd->mi, proc0paddr);
1722 safepri = TDPRI_MAX;
1724 /* spinlocks and the BGL */
1728 for (x = 0; x < NIDT; x++)
1729 setidt(x, &IDTVEC(rsvd), SDT_SYSIGT, SEL_KPL, 0);
1730 setidt(IDT_DE, &IDTVEC(div), SDT_SYSIGT, SEL_KPL, 0);
1731 setidt(IDT_DB, &IDTVEC(dbg), SDT_SYSIGT, SEL_KPL, 0);
1732 setidt(IDT_NMI, &IDTVEC(nmi), SDT_SYSIGT, SEL_KPL, 1);
1733 setidt(IDT_BP, &IDTVEC(bpt), SDT_SYSIGT, SEL_UPL, 0);
1734 setidt(IDT_OF, &IDTVEC(ofl), SDT_SYSIGT, SEL_KPL, 0);
1735 setidt(IDT_BR, &IDTVEC(bnd), SDT_SYSIGT, SEL_KPL, 0);
1736 setidt(IDT_UD, &IDTVEC(ill), SDT_SYSIGT, SEL_KPL, 0);
1737 setidt(IDT_NM, &IDTVEC(dna), SDT_SYSIGT, SEL_KPL, 0);
1738 setidt(IDT_DF, &IDTVEC(dblfault), SDT_SYSIGT, SEL_KPL, 1);
1739 setidt(IDT_FPUGP, &IDTVEC(fpusegm), SDT_SYSIGT, SEL_KPL, 0);
1740 setidt(IDT_TS, &IDTVEC(tss), SDT_SYSIGT, SEL_KPL, 0);
1741 setidt(IDT_NP, &IDTVEC(missing), SDT_SYSIGT, SEL_KPL, 0);
1742 setidt(IDT_SS, &IDTVEC(stk), SDT_SYSIGT, SEL_KPL, 0);
1743 setidt(IDT_GP, &IDTVEC(prot), SDT_SYSIGT, SEL_KPL, 0);
1744 setidt(IDT_PF, &IDTVEC(page), SDT_SYSIGT, SEL_KPL, 0);
1745 setidt(IDT_MF, &IDTVEC(fpu), SDT_SYSIGT, SEL_KPL, 0);
1746 setidt(IDT_AC, &IDTVEC(align), SDT_SYSIGT, SEL_KPL, 0);
1747 setidt(IDT_MC, &IDTVEC(mchk), SDT_SYSIGT, SEL_KPL, 0);
1748 setidt(IDT_XF, &IDTVEC(xmm), SDT_SYSIGT, SEL_KPL, 0);
1750 r_idt.rd_limit = sizeof(idt0) - 1;
1751 r_idt.rd_base = (long) idt;
1755 * Initialize the console before we print anything out.
1760 if (metadata_missing)
1761 kprintf("WARNING: loader(8) metadata is missing!\n");
1771 if (boothowto & RB_KDB)
1772 Debugger("Boot flags requested debugger");
1776 finishidentcpu(); /* Final stage of CPU initialization */
1777 setidt(6, &IDTVEC(ill), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1778 setidt(13, &IDTVEC(prot), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1780 identify_cpu(); /* Final stage of CPU initialization */
1781 initializecpu(); /* Initialize CPU registers */
1783 /* make an initial tss so cpu can get interrupt stack on syscall! */
1784 gd->gd_common_tss.tss_rsp0 =
1785 (register_t)(thread0.td_kstack +
1786 KSTACK_PAGES * PAGE_SIZE - sizeof(struct pcb));
1787 /* Ensure the stack is aligned to 16 bytes */
1788 gd->gd_common_tss.tss_rsp0 &= ~0xFul;
1789 gd->gd_rsp0 = gd->gd_common_tss.tss_rsp0;
1791 /* doublefault stack space, runs on ist1 */
1792 gd->gd_common_tss.tss_ist1 = (long)&dblfault_stack[sizeof(dblfault_stack)];
1794 /* Set the IO permission bitmap (empty due to tss seg limit) */
1795 gd->gd_common_tss.tss_iobase = sizeof(struct x86_64tss);
1797 gsel_tss = GSEL(GPROC0_SEL, SEL_KPL);
1798 gd->gd_tss_gdt = &gdt[GPROC0_SEL];
1799 gd->gd_common_tssd = *gd->gd_tss_gdt;
1802 /* Set up the fast syscall stuff */
1803 msr = rdmsr(MSR_EFER) | EFER_SCE;
1804 wrmsr(MSR_EFER, msr);
1805 wrmsr(MSR_LSTAR, (u_int64_t)IDTVEC(fast_syscall));
1806 wrmsr(MSR_CSTAR, (u_int64_t)IDTVEC(fast_syscall32));
1807 msr = ((u_int64_t)GSEL(GCODE_SEL, SEL_KPL) << 32) |
1808 ((u_int64_t)GSEL(GUCODE32_SEL, SEL_UPL) << 48);
1809 wrmsr(MSR_STAR, msr);
1810 wrmsr(MSR_SF_MASK, PSL_NT|PSL_T|PSL_I|PSL_C|PSL_D);
1812 getmemsize(kmdp, physfree);
1813 init_param2(physmem);
1815 /* now running on new page tables, configured,and u/iom is accessible */
1817 /* Map the message buffer. */
1819 for (off = 0; off < round_page(MSGBUF_SIZE); off += PAGE_SIZE)
1820 pmap_kenter((vm_offset_t)msgbufp + off, avail_end + off);
1823 msgbufinit(msgbufp, MSGBUF_SIZE);
1826 /* transfer to user mode */
1828 _ucodesel = GSEL(GUCODE_SEL, SEL_UPL);
1829 _udatasel = GSEL(GUDATA_SEL, SEL_UPL);
1830 _ucode32sel = GSEL(GUCODE32_SEL, SEL_UPL);
1836 /* setup proc 0's pcb */
1837 thread0.td_pcb->pcb_flags = 0;
1838 thread0.td_pcb->pcb_cr3 = KPML4phys;
1839 thread0.td_pcb->pcb_ext = 0;
1840 lwp0.lwp_md.md_regs = &proc0_tf;
1841 env = kgetenv("kernelname");
1843 strlcpy(kernelname, env, sizeof(kernelname));
1845 /* Location of kernel stack for locore */
1846 return ((u_int64_t)thread0.td_pcb);
1850 * Initialize machine-dependant portions of the global data structure.
1851 * Note that the global data area and cpu0's idlestack in the private
1852 * data space were allocated in locore.
1854 * Note: the idlethread's cpl is 0
1856 * WARNING! Called from early boot, 'mycpu' may not work yet.
1859 cpu_gdinit(struct mdglobaldata *gd, int cpu)
1862 gd->mi.gd_curthread = &gd->mi.gd_idlethread;
1864 lwkt_init_thread(&gd->mi.gd_idlethread,
1865 gd->mi.gd_prvspace->idlestack,
1866 sizeof(gd->mi.gd_prvspace->idlestack),
1867 TDF_MPSAFE, &gd->mi);
1868 lwkt_set_comm(&gd->mi.gd_idlethread, "idle_%d", cpu);
1869 gd->mi.gd_idlethread.td_switch = cpu_lwkt_switch;
1870 gd->mi.gd_idlethread.td_sp -= sizeof(void *);
1871 *(void **)gd->mi.gd_idlethread.td_sp = cpu_idle_restore;
1875 is_globaldata_space(vm_offset_t saddr, vm_offset_t eaddr)
1877 if (saddr >= (vm_offset_t)&CPU_prvspace[0] &&
1878 eaddr <= (vm_offset_t)&CPU_prvspace[MAXCPU]) {
1885 globaldata_find(int cpu)
1887 KKASSERT(cpu >= 0 && cpu < ncpus);
1888 return(&CPU_prvspace[cpu].mdglobaldata.mi);
1891 #if defined(I586_CPU) && !defined(NO_F00F_HACK)
1892 static void f00f_hack(void *unused);
1893 SYSINIT(f00f_hack, SI_BOOT2_BIOS, SI_ORDER_ANY, f00f_hack, NULL);
1896 f00f_hack(void *unused)
1898 struct gate_descriptor *new_idt;
1904 kprintf("Intel Pentium detected, installing workaround for F00F bug\n");
1906 r_idt.rd_limit = sizeof(idt0) - 1;
1908 tmp = kmem_alloc(&kernel_map, PAGE_SIZE * 2);
1910 panic("kmem_alloc returned 0");
1911 if (((unsigned int)tmp & (PAGE_SIZE-1)) != 0)
1912 panic("kmem_alloc returned non-page-aligned memory");
1913 /* Put the first seven entries in the lower page */
1914 new_idt = (struct gate_descriptor*)(tmp + PAGE_SIZE - (7*8));
1915 bcopy(idt, new_idt, sizeof(idt0));
1916 r_idt.rd_base = (int)new_idt;
1919 if (vm_map_protect(&kernel_map, tmp, tmp + PAGE_SIZE,
1920 VM_PROT_READ, FALSE) != KERN_SUCCESS)
1921 panic("vm_map_protect failed");
1924 #endif /* defined(I586_CPU) && !NO_F00F_HACK */
1927 ptrace_set_pc(struct lwp *lp, unsigned long addr)
1929 lp->lwp_md.md_regs->tf_rip = addr;
1934 ptrace_single_step(struct lwp *lp)
1936 lp->lwp_md.md_regs->tf_rflags |= PSL_T;
1941 fill_regs(struct lwp *lp, struct reg *regs)
1944 struct trapframe *tp;
1946 tp = lp->lwp_md.md_regs;
1947 bcopy(&tp->tf_rdi, ®s->r_rdi, sizeof(*regs));
1949 pcb = lp->lwp_thread->td_pcb;
1954 set_regs(struct lwp *lp, struct reg *regs)
1957 struct trapframe *tp;
1959 tp = lp->lwp_md.md_regs;
1960 if (!EFL_SECURE(regs->r_rflags, tp->tf_rflags) ||
1961 !CS_SECURE(regs->r_cs))
1963 bcopy(®s->r_rdi, &tp->tf_rdi, sizeof(*regs));
1964 pcb = lp->lwp_thread->td_pcb;
1968 #ifndef CPU_DISABLE_SSE
1970 fill_fpregs_xmm(struct savexmm *sv_xmm, struct save87 *sv_87)
1972 struct env87 *penv_87 = &sv_87->sv_env;
1973 struct envxmm *penv_xmm = &sv_xmm->sv_env;
1976 /* FPU control/status */
1977 penv_87->en_cw = penv_xmm->en_cw;
1978 penv_87->en_sw = penv_xmm->en_sw;
1979 penv_87->en_tw = penv_xmm->en_tw;
1980 penv_87->en_fip = penv_xmm->en_fip;
1981 penv_87->en_fcs = penv_xmm->en_fcs;
1982 penv_87->en_opcode = penv_xmm->en_opcode;
1983 penv_87->en_foo = penv_xmm->en_foo;
1984 penv_87->en_fos = penv_xmm->en_fos;
1987 for (i = 0; i < 8; ++i)
1988 sv_87->sv_ac[i] = sv_xmm->sv_fp[i].fp_acc;
1990 sv_87->sv_ex_sw = sv_xmm->sv_ex_sw;
1994 set_fpregs_xmm(struct save87 *sv_87, struct savexmm *sv_xmm)
1996 struct env87 *penv_87 = &sv_87->sv_env;
1997 struct envxmm *penv_xmm = &sv_xmm->sv_env;
2000 /* FPU control/status */
2001 penv_xmm->en_cw = penv_87->en_cw;
2002 penv_xmm->en_sw = penv_87->en_sw;
2003 penv_xmm->en_tw = penv_87->en_tw;
2004 penv_xmm->en_fip = penv_87->en_fip;
2005 penv_xmm->en_fcs = penv_87->en_fcs;
2006 penv_xmm->en_opcode = penv_87->en_opcode;
2007 penv_xmm->en_foo = penv_87->en_foo;
2008 penv_xmm->en_fos = penv_87->en_fos;
2011 for (i = 0; i < 8; ++i)
2012 sv_xmm->sv_fp[i].fp_acc = sv_87->sv_ac[i];
2014 sv_xmm->sv_ex_sw = sv_87->sv_ex_sw;
2016 #endif /* CPU_DISABLE_SSE */
2019 fill_fpregs(struct lwp *lp, struct fpreg *fpregs)
2021 #ifndef CPU_DISABLE_SSE
2023 fill_fpregs_xmm(&lp->lwp_thread->td_pcb->pcb_save.sv_xmm,
2024 (struct save87 *)fpregs);
2027 #endif /* CPU_DISABLE_SSE */
2028 bcopy(&lp->lwp_thread->td_pcb->pcb_save.sv_87, fpregs, sizeof *fpregs);
2033 set_fpregs(struct lwp *lp, struct fpreg *fpregs)
2035 #ifndef CPU_DISABLE_SSE
2037 set_fpregs_xmm((struct save87 *)fpregs,
2038 &lp->lwp_thread->td_pcb->pcb_save.sv_xmm);
2041 #endif /* CPU_DISABLE_SSE */
2042 bcopy(fpregs, &lp->lwp_thread->td_pcb->pcb_save.sv_87, sizeof *fpregs);
2047 fill_dbregs(struct lwp *lp, struct dbreg *dbregs)
2050 dbregs->dr[0] = rdr0();
2051 dbregs->dr[1] = rdr1();
2052 dbregs->dr[2] = rdr2();
2053 dbregs->dr[3] = rdr3();
2054 dbregs->dr[4] = rdr4();
2055 dbregs->dr[5] = rdr5();
2056 dbregs->dr[6] = rdr6();
2057 dbregs->dr[7] = rdr7();
2061 pcb = lp->lwp_thread->td_pcb;
2062 dbregs->dr[0] = pcb->pcb_dr0;
2063 dbregs->dr[1] = pcb->pcb_dr1;
2064 dbregs->dr[2] = pcb->pcb_dr2;
2065 dbregs->dr[3] = pcb->pcb_dr3;
2068 dbregs->dr[6] = pcb->pcb_dr6;
2069 dbregs->dr[7] = pcb->pcb_dr7;
2075 set_dbregs(struct lwp *lp, struct dbreg *dbregs)
2078 load_dr0(dbregs->dr[0]);
2079 load_dr1(dbregs->dr[1]);
2080 load_dr2(dbregs->dr[2]);
2081 load_dr3(dbregs->dr[3]);
2082 load_dr4(dbregs->dr[4]);
2083 load_dr5(dbregs->dr[5]);
2084 load_dr6(dbregs->dr[6]);
2085 load_dr7(dbregs->dr[7]);
2088 struct ucred *ucred;
2090 uint64_t mask1, mask2;
2093 * Don't let an illegal value for dr7 get set. Specifically,
2094 * check for undefined settings. Setting these bit patterns
2095 * result in undefined behaviour and can lead to an unexpected
2098 /* JG this loop looks unreadable */
2099 /* Check 4 2-bit fields for invalid patterns.
2100 * These fields are R/Wi, for i = 0..3
2102 /* Is 10 in LENi allowed when running in compatibility mode? */
2103 /* Pattern 10 in R/Wi might be used to indicate
2104 * breakpoint on I/O. Further analysis should be
2105 * carried to decide if it is safe and useful to
2106 * provide access to that capability
2108 for (i = 0, mask1 = 0x3<<16, mask2 = 0x2<<16; i < 4;
2109 i++, mask1 <<= 4, mask2 <<= 4)
2110 if ((dbregs->dr[7] & mask1) == mask2)
2113 pcb = lp->lwp_thread->td_pcb;
2114 ucred = lp->lwp_proc->p_ucred;
2117 * Don't let a process set a breakpoint that is not within the
2118 * process's address space. If a process could do this, it
2119 * could halt the system by setting a breakpoint in the kernel
2120 * (if ddb was enabled). Thus, we need to check to make sure
2121 * that no breakpoints are being enabled for addresses outside
2122 * process's address space, unless, perhaps, we were called by
2125 * XXX - what about when the watched area of the user's
2126 * address space is written into from within the kernel
2127 * ... wouldn't that still cause a breakpoint to be generated
2128 * from within kernel mode?
2131 if (priv_check_cred(ucred, PRIV_ROOT, 0) != 0) {
2132 if (dbregs->dr[7] & 0x3) {
2133 /* dr0 is enabled */
2134 if (dbregs->dr[0] >= VM_MAX_USER_ADDRESS)
2138 if (dbregs->dr[7] & (0x3<<2)) {
2139 /* dr1 is enabled */
2140 if (dbregs->dr[1] >= VM_MAX_USER_ADDRESS)
2144 if (dbregs->dr[7] & (0x3<<4)) {
2145 /* dr2 is enabled */
2146 if (dbregs->dr[2] >= VM_MAX_USER_ADDRESS)
2150 if (dbregs->dr[7] & (0x3<<6)) {
2151 /* dr3 is enabled */
2152 if (dbregs->dr[3] >= VM_MAX_USER_ADDRESS)
2157 pcb->pcb_dr0 = dbregs->dr[0];
2158 pcb->pcb_dr1 = dbregs->dr[1];
2159 pcb->pcb_dr2 = dbregs->dr[2];
2160 pcb->pcb_dr3 = dbregs->dr[3];
2161 pcb->pcb_dr6 = dbregs->dr[6];
2162 pcb->pcb_dr7 = dbregs->dr[7];
2164 pcb->pcb_flags |= PCB_DBREGS;
2171 * Return > 0 if a hardware breakpoint has been hit, and the
2172 * breakpoint was in user space. Return 0, otherwise.
2175 user_dbreg_trap(void)
2177 u_int64_t dr7, dr6; /* debug registers dr6 and dr7 */
2178 u_int64_t bp; /* breakpoint bits extracted from dr6 */
2179 int nbp; /* number of breakpoints that triggered */
2180 caddr_t addr[4]; /* breakpoint addresses */
2184 if ((dr7 & 0xff) == 0) {
2186 * all GE and LE bits in the dr7 register are zero,
2187 * thus the trap couldn't have been caused by the
2188 * hardware debug registers
2199 * None of the breakpoint bits are set meaning this
2200 * trap was not caused by any of the debug registers
2206 * at least one of the breakpoints were hit, check to see
2207 * which ones and if any of them are user space addresses
2211 addr[nbp++] = (caddr_t)rdr0();
2214 addr[nbp++] = (caddr_t)rdr1();
2217 addr[nbp++] = (caddr_t)rdr2();
2220 addr[nbp++] = (caddr_t)rdr3();
2223 for (i=0; i<nbp; i++) {
2225 (caddr_t)VM_MAX_USER_ADDRESS) {
2227 * addr[i] is in user space
2234 * None of the breakpoints are in user space.
2242 Debugger(const char *msg)
2244 kprintf("Debugger(\"%s\") called.\n", msg);
2251 * Provide inb() and outb() as functions. They are normally only
2252 * available as macros calling inlined functions, thus cannot be
2253 * called inside DDB.
2255 * The actual code is stolen from <machine/cpufunc.h>, and de-inlined.
2261 /* silence compiler warnings */
2263 void outb(u_int, u_char);
2270 * We use %%dx and not %1 here because i/o is done at %dx and not at
2271 * %edx, while gcc generates inferior code (movw instead of movl)
2272 * if we tell it to load (u_short) port.
2274 __asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port));
2279 outb(u_int port, u_char data)
2283 * Use an unnecessary assignment to help gcc's register allocator.
2284 * This make a large difference for gcc-1.40 and a tiny difference
2285 * for gcc-2.6.0. For gcc-1.40, al had to be ``asm("ax")'' for
2286 * best results. gcc-2.6.0 can't handle this.
2289 __asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port));
2296 #include "opt_cpu.h"
2300 * initialize all the SMP locks
2303 /* critical region when masking or unmasking interupts */
2304 struct spinlock_deprecated imen_spinlock;
2306 /* Make FAST_INTR() routines sequential */
2307 struct spinlock_deprecated fast_intr_spinlock;
2309 /* critical region for old style disable_intr/enable_intr */
2310 struct spinlock_deprecated mpintr_spinlock;
2312 /* critical region around INTR() routines */
2313 struct spinlock_deprecated intr_spinlock;
2315 /* lock region used by kernel profiling */
2316 struct spinlock_deprecated mcount_spinlock;
2318 /* locks com (tty) data/hardware accesses: a FASTINTR() */
2319 struct spinlock_deprecated com_spinlock;
2321 /* locks kernel kprintfs */
2322 struct spinlock_deprecated cons_spinlock;
2324 /* lock regions around the clock hardware */
2325 struct spinlock_deprecated clock_spinlock;
2327 /* lock around the MP rendezvous */
2328 struct spinlock_deprecated smp_rv_spinlock;
2334 * mp_lock = 0; BSP already owns the MP lock
2337 * Get the initial mp_lock with a count of 1 for the BSP.
2338 * This uses a LOGICAL cpu ID, ie BSP == 0.
2341 cpu_get_initial_mplock();
2344 spin_lock_init(&mcount_spinlock);
2345 spin_lock_init(&fast_intr_spinlock);
2346 spin_lock_init(&intr_spinlock);
2347 spin_lock_init(&mpintr_spinlock);
2348 spin_lock_init(&imen_spinlock);
2349 spin_lock_init(&smp_rv_spinlock);
2350 spin_lock_init(&com_spinlock);
2351 spin_lock_init(&clock_spinlock);
2352 spin_lock_init(&cons_spinlock);
2354 /* our token pool needs to work early */
2355 lwkt_token_pool_init();