2 * Copyright (c) 1992 Terrence R. Lambert.
3 * Copyright (C) 1994, David Greenman
4 * Copyright (c) 1982, 1987, 1990, 1993
5 * The Regents of the University of California. All rights reserved.
7 * This code is derived from software contributed to Berkeley by
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed by the University of
21 * California, Berkeley and its contributors.
22 * 4. Neither the name of the University nor the names of its contributors
23 * may be used to endorse or promote products derived from this software
24 * without specific prior written permission.
26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 * from: @(#)machdep.c 7.4 (Berkeley) 6/3/91
39 * $FreeBSD: src/sys/i386/i386/machdep.c,v 1.385.2.30 2003/05/31 08:48:05 alc Exp $
40 * $DragonFly: src/sys/platform/vkernel/i386/cpu_regs.c,v 1.29 2008/06/06 13:19:25 swildner Exp $
43 #include "use_ether.h"
45 #include "opt_atalk.h"
46 #include "opt_compat.h"
48 #include "opt_directio.h"
51 #include "opt_msgbuf.h"
54 #include <sys/param.h>
55 #include <sys/systm.h>
56 #include <sys/sysproto.h>
57 #include <sys/signalvar.h>
58 #include <sys/kernel.h>
59 #include <sys/linker.h>
60 #include <sys/malloc.h>
63 #include <sys/reboot.h>
65 #include <sys/msgbuf.h>
66 #include <sys/sysent.h>
67 #include <sys/sysctl.h>
68 #include <sys/vmmeter.h>
70 #include <sys/upcall.h>
71 #include <sys/usched.h>
75 #include <vm/vm_param.h>
77 #include <vm/vm_kern.h>
78 #include <vm/vm_object.h>
79 #include <vm/vm_page.h>
80 #include <vm/vm_map.h>
81 #include <vm/vm_pager.h>
82 #include <vm/vm_extern.h>
84 #include <sys/thread2.h>
85 #include <sys/mplock2.h>
93 #include <machine/cpu.h>
94 #include <machine/clock.h>
95 #include <machine/specialreg.h>
96 #include <machine/md_var.h>
97 #include <machine/pcb_ext.h> /* pcb.h included via sys/user.h */
98 #include <machine/globaldata.h> /* CPU_prvspace */
99 #include <machine/smp.h>
101 #include <machine/perfmon.h>
103 #include <machine/cputypes.h>
105 #include <bus/isa/rtc.h>
106 #include <sys/random.h>
107 #include <sys/ptrace.h>
108 #include <machine/sigframe.h>
109 #include <unistd.h> /* umtx_* functions */
111 extern void dblfault_handler (void);
113 #ifndef CPU_DISABLE_SSE
114 static void set_fpregs_xmm (struct save87 *, struct savexmm *);
115 static void fill_fpregs_xmm (struct savexmm *, struct save87 *);
116 #endif /* CPU_DISABLE_SSE */
118 extern void ffs_rawread_setup(void);
119 #endif /* DIRECTIO */
122 int64_t tsc_offsets[MAXCPU];
124 int64_t tsc_offsets[1];
127 #if defined(SWTCH_OPTIM_STATS)
128 extern int swtch_optim_stats;
129 SYSCTL_INT(_debug, OID_AUTO, swtch_optim_stats,
130 CTLFLAG_RD, &swtch_optim_stats, 0, "");
131 SYSCTL_INT(_debug, OID_AUTO, tlb_flush_count,
132 CTLFLAG_RD, &tlb_flush_count, 0, "");
136 sysctl_hw_physmem(SYSCTL_HANDLER_ARGS)
139 int error = sysctl_handle_int(oidp, 0, ctob((int)Maxmem), req);
143 SYSCTL_PROC(_hw, HW_PHYSMEM, physmem, CTLTYPE_INT|CTLFLAG_RD,
144 0, 0, sysctl_hw_physmem, "IU", "");
147 sysctl_hw_usermem(SYSCTL_HANDLER_ARGS)
150 int error = sysctl_handle_int(oidp, 0,
151 ctob((int)Maxmem - vmstats.v_wire_count), req);
155 SYSCTL_PROC(_hw, HW_USERMEM, usermem, CTLTYPE_INT|CTLFLAG_RD,
156 0, 0, sysctl_hw_usermem, "IU", "");
158 SYSCTL_ULONG(_hw, OID_AUTO, availpages, CTLFLAG_RD, &Maxmem, 0, "");
163 sysctl_machdep_msgbuf(SYSCTL_HANDLER_ARGS)
167 /* Unwind the buffer, so that it's linear (possibly starting with
168 * some initial nulls).
170 error=sysctl_handle_opaque(oidp,msgbufp->msg_ptr+msgbufp->msg_bufr,
171 msgbufp->msg_size-msgbufp->msg_bufr,req);
172 if(error) return(error);
173 if(msgbufp->msg_bufr>0) {
174 error=sysctl_handle_opaque(oidp,msgbufp->msg_ptr,
175 msgbufp->msg_bufr,req);
180 SYSCTL_PROC(_machdep, OID_AUTO, msgbuf, CTLTYPE_STRING|CTLFLAG_RD,
181 0, 0, sysctl_machdep_msgbuf, "A","Contents of kernel message buffer");
183 static int msgbuf_clear;
186 sysctl_machdep_msgbuf_clear(SYSCTL_HANDLER_ARGS)
189 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2,
191 if (!error && req->newptr) {
192 /* Clear the buffer and reset write pointer */
193 bzero(msgbufp->msg_ptr,msgbufp->msg_size);
194 msgbufp->msg_bufr=msgbufp->msg_bufx=0;
200 SYSCTL_PROC(_machdep, OID_AUTO, msgbuf_clear, CTLTYPE_INT|CTLFLAG_RW,
201 &msgbuf_clear, 0, sysctl_machdep_msgbuf_clear, "I",
202 "Clear kernel message buffer");
207 * Send an interrupt to process.
209 * Stack is set up to allow sigcode stored
210 * at top to call routine, followed by kcall
211 * to sigreturn routine below. After sigreturn
212 * resets the signal mask, the stack, and the
213 * frame pointer, it returns to the user
217 sendsig(sig_t catcher, int sig, sigset_t *mask, u_long code)
219 struct lwp *lp = curthread->td_lwp;
220 struct proc *p = lp->lwp_proc;
221 struct trapframe *regs;
222 struct sigacts *psp = p->p_sigacts;
223 struct sigframe sf, *sfp;
227 regs = lp->lwp_md.md_regs;
228 oonstack = (lp->lwp_sigstk.ss_flags & SS_ONSTACK) ? 1 : 0;
230 /* Save user context */
231 bzero(&sf, sizeof(struct sigframe));
232 sf.sf_uc.uc_sigmask = *mask;
233 sf.sf_uc.uc_stack = lp->lwp_sigstk;
234 sf.sf_uc.uc_mcontext.mc_onstack = oonstack;
235 KKASSERT(__offsetof(struct trapframe, tf_rdi) == 0);
236 bcopy(regs, &sf.sf_uc.uc_mcontext.mc_rdi, sizeof(struct trapframe));
238 /* Make the size of the saved context visible to userland */
239 sf.sf_uc.uc_mcontext.mc_len = sizeof(sf.sf_uc.uc_mcontext);
241 /* Save mailbox pending state for syscall interlock semantics */
242 if (p->p_flag & P_MAILBOX)
243 sf.sf_uc.uc_mcontext.mc_xflags |= PGEX_MAILBOX;
245 /* Allocate and validate space for the signal handler context. */
246 if ((lp->lwp_flag & LWP_ALTSTACK) != 0 && !oonstack &&
247 SIGISMEMBER(psp->ps_sigonstack, sig)) {
248 sp = (char *)(lp->lwp_sigstk.ss_sp + lp->lwp_sigstk.ss_size -
249 sizeof(struct sigframe));
250 lp->lwp_sigstk.ss_flags |= SS_ONSTACK;
252 /* We take red zone into account */
253 sp = (char *)regs->tf_rsp - sizeof(struct sigframe) - 128;
256 /* Align to 16 bytes */
257 sfp = (struct sigframe *)((intptr_t)sp & ~0xFUL);
259 /* Translate the signal is appropriate */
260 if (p->p_sysent->sv_sigtbl) {
261 if (sig <= p->p_sysent->sv_sigsize)
262 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)];
266 * Build the argument list for the signal handler.
268 * Arguments are in registers (%rdi, %rsi, %rdx, %rcx)
270 regs->tf_rdi = sig; /* argument 1 */
271 regs->tf_rdx = (register_t)&sfp->sf_uc; /* argument 3 */
273 if (SIGISMEMBER(psp->ps_siginfo, sig)) {
275 * Signal handler installed with SA_SIGINFO.
277 * action(signo, siginfo, ucontext)
279 regs->tf_rsi = (register_t)&sfp->sf_si; /* argument 2 */
280 regs->tf_rcx = (register_t)regs->tf_err; /* argument 4 */
281 sf.sf_ahu.sf_action = (__siginfohandler_t *)catcher;
283 /* fill siginfo structure */
284 sf.sf_si.si_signo = sig;
285 sf.sf_si.si_code = code;
286 sf.sf_si.si_addr = (void *)regs->tf_err;
289 * Old FreeBSD-style arguments.
291 * handler (signo, code, [uc], addr)
293 regs->tf_rsi = (register_t)code; /* argument 2 */
294 regs->tf_rcx = (register_t)regs->tf_err; /* argument 4 */
295 sf.sf_ahu.sf_handler = catcher;
300 * If we're a vm86 process, we want to save the segment registers.
301 * We also change eflags to be our emulated eflags, not the actual
304 if (regs->tf_eflags & PSL_VM) {
305 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs;
306 struct vm86_kernel *vm86 = &lp->lwp_thread->td_pcb->pcb_ext->ext_vm86;
308 sf.sf_uc.uc_mcontext.mc_gs = tf->tf_vm86_gs;
309 sf.sf_uc.uc_mcontext.mc_fs = tf->tf_vm86_fs;
310 sf.sf_uc.uc_mcontext.mc_es = tf->tf_vm86_es;
311 sf.sf_uc.uc_mcontext.mc_ds = tf->tf_vm86_ds;
313 if (vm86->vm86_has_vme == 0)
314 sf.sf_uc.uc_mcontext.mc_eflags =
315 (tf->tf_eflags & ~(PSL_VIF | PSL_VIP)) |
316 (vm86->vm86_eflags & (PSL_VIF | PSL_VIP));
319 * Clear PSL_NT to inhibit T_TSSFLT faults on return from
320 * syscalls made by the signal handler. This just avoids
321 * wasting time for our lazy fixup of such faults. PSL_NT
322 * does nothing in vm86 mode, but vm86 programs can set it
323 * almost legitimately in probes for old cpu types.
325 tf->tf_eflags &= ~(PSL_VM | PSL_NT | PSL_VIF | PSL_VIP);
330 * Save the FPU state and reinit the FP unit
332 npxpush(&sf.sf_uc.uc_mcontext);
335 * Copy the sigframe out to the user's stack.
337 if (copyout(&sf, sfp, sizeof(struct sigframe)) != 0) {
339 * Something is wrong with the stack pointer.
340 * ...Kill the process.
345 regs->tf_rsp = (register_t)sfp;
346 regs->tf_rip = PS_STRINGS - *(p->p_sysent->sv_szsigcode);
349 * i386 abi specifies that the direction flag must be cleared
352 regs->tf_rflags &= ~(PSL_T|PSL_D);
355 * 64 bit mode has a code and stack selector but
356 * no data or extra selector. %fs and %gs are not
359 regs->tf_cs = _ucodesel;
360 regs->tf_ss = _udatasel;
364 * Sanitize the trapframe for a virtual kernel passing control to a custom
365 * VM context. Remove any items that would otherwise create a privilage
368 * XXX at the moment we allow userland to set the resume flag. Is this a
372 cpu_sanitize_frame(struct trapframe *frame)
374 frame->tf_cs = _ucodesel;
375 frame->tf_ss = _udatasel;
376 /* XXX VM (8086) mode not supported? */
377 frame->tf_rflags &= (PSL_RF | PSL_USERCHANGE | PSL_VM_UNSUPP);
378 frame->tf_rflags |= PSL_RESERVED_DEFAULT | PSL_I;
384 * Sanitize the tls so loading the descriptor does not blow up
385 * on us. For AMD64 we don't have to do anything.
388 cpu_sanitize_tls(struct savetls *tls)
394 * sigreturn(ucontext_t *sigcntxp)
396 * System call to cleanup state after a signal
397 * has been taken. Reset signal mask and
398 * stack state from context left by sendsig (above).
399 * Return to previous pc and psl as specified by
400 * context left by sendsig. Check carefully to
401 * make sure that the user has not modified the
402 * state to gain improper privileges.
404 #define EFL_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0)
405 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL)
408 sys_sigreturn(struct sigreturn_args *uap)
410 struct lwp *lp = curthread->td_lwp;
411 struct proc *p = lp->lwp_proc;
412 struct trapframe *regs;
420 * We have to copy the information into kernel space so userland
421 * can't modify it while we are sniffing it.
423 regs = lp->lwp_md.md_regs;
424 error = copyin(uap->sigcntxp, &uc, sizeof(uc));
428 rflags = ucp->uc_mcontext.mc_rflags;
430 /* VM (8086) mode not supported */
431 rflags &= ~PSL_VM_UNSUPP;
434 if (eflags & PSL_VM) {
435 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs;
436 struct vm86_kernel *vm86;
439 * if pcb_ext == 0 or vm86_inited == 0, the user hasn't
440 * set up the vm86 area, and we can't enter vm86 mode.
442 if (lp->lwp_thread->td_pcb->pcb_ext == 0)
444 vm86 = &lp->lwp_thread->td_pcb->pcb_ext->ext_vm86;
445 if (vm86->vm86_inited == 0)
448 /* go back to user mode if both flags are set */
449 if ((eflags & PSL_VIP) && (eflags & PSL_VIF))
450 trapsignal(lp->lwp_proc, SIGBUS, 0);
452 if (vm86->vm86_has_vme) {
453 eflags = (tf->tf_eflags & ~VME_USERCHANGE) |
454 (eflags & VME_USERCHANGE) | PSL_VM;
456 vm86->vm86_eflags = eflags; /* save VIF, VIP */
457 eflags = (tf->tf_eflags & ~VM_USERCHANGE) | (eflags & VM_USERCHANGE) | PSL_VM;
459 bcopy(&ucp.uc_mcontext.mc_gs, tf, sizeof(struct trapframe));
460 tf->tf_eflags = eflags;
461 tf->tf_vm86_ds = tf->tf_ds;
462 tf->tf_vm86_es = tf->tf_es;
463 tf->tf_vm86_fs = tf->tf_fs;
464 tf->tf_vm86_gs = tf->tf_gs;
465 tf->tf_ds = _udatasel;
466 tf->tf_es = _udatasel;
468 tf->tf_fs = _udatasel;
469 tf->tf_gs = _udatasel;
475 * Don't allow users to change privileged or reserved flags.
478 * XXX do allow users to change the privileged flag PSL_RF.
479 * The cpu sets PSL_RF in tf_eflags for faults. Debuggers
480 * should sometimes set it there too. tf_eflags is kept in
481 * the signal context during signal handling and there is no
482 * other place to remember it, so the PSL_RF bit may be
483 * corrupted by the signal handler without us knowing.
484 * Corruption of the PSL_RF bit at worst causes one more or
485 * one less debugger trap, so allowing it is fairly harmless.
487 if (!EFL_SECURE(rflags & ~PSL_RF, regs->tf_rflags & ~PSL_RF)) {
488 kprintf("sigreturn: rflags = 0x%lx\n", (long)rflags);
493 * Don't allow users to load a valid privileged %cs. Let the
494 * hardware check for invalid selectors, excess privilege in
495 * other selectors, invalid %eip's and invalid %esp's.
497 cs = ucp->uc_mcontext.mc_cs;
498 if (!CS_SECURE(cs)) {
499 kprintf("sigreturn: cs = 0x%x\n", cs);
500 trapsignal(lp, SIGBUS, T_PROTFLT);
503 bcopy(&ucp->uc_mcontext.mc_rdi, regs, sizeof(struct trapframe));
507 * Restore the FPU state from the frame
509 npxpop(&ucp->uc_mcontext);
512 * Merge saved signal mailbox pending flag to maintain interlock
513 * semantics against system calls.
515 if (ucp->uc_mcontext.mc_xflags & PGEX_MAILBOX)
516 p->p_flag |= P_MAILBOX;
518 if (ucp->uc_mcontext.mc_onstack & 1)
519 lp->lwp_sigstk.ss_flags |= SS_ONSTACK;
521 lp->lwp_sigstk.ss_flags &= ~SS_ONSTACK;
523 lp->lwp_sigmask = ucp->uc_sigmask;
524 SIG_CANTMASK(lp->lwp_sigmask);
529 * Stack frame on entry to function. %rax will contain the function vector,
530 * %rcx will contain the function data. flags, rcx, and rax will have
531 * already been pushed on the stack.
542 sendupcall(struct vmupcall *vu, int morepending)
544 struct lwp *lp = curthread->td_lwp;
545 struct trapframe *regs;
546 struct upcall upcall;
547 struct upc_frame upc_frame;
551 * If we are a virtual kernel running an emulated user process
552 * context, switch back to the virtual kernel context before
553 * trying to post the signal.
555 if (lp->lwp_vkernel && lp->lwp_vkernel->ve) {
556 lp->lwp_md.md_regs->tf_trapno = 0;
557 vkernel_trap(lp, lp->lwp_md.md_regs);
561 * Get the upcall data structure
563 if (copyin(lp->lwp_upcall, &upcall, sizeof(upcall)) ||
564 copyin((char *)upcall.upc_uthread + upcall.upc_critoff, &crit_count, sizeof(int))
567 kprintf("bad upcall address\n");
572 * If the data structure is already marked pending or has a critical
573 * section count, mark the data structure as pending and return
574 * without doing an upcall. vu_pending is left set.
576 if (upcall.upc_pending || crit_count >= vu->vu_pending) {
577 if (upcall.upc_pending < vu->vu_pending) {
578 upcall.upc_pending = vu->vu_pending;
579 copyout(&upcall.upc_pending, &lp->lwp_upcall->upc_pending,
580 sizeof(upcall.upc_pending));
586 * We can run this upcall now, clear vu_pending.
588 * Bump our critical section count and set or clear the
589 * user pending flag depending on whether more upcalls are
590 * pending. The user will be responsible for calling
591 * upc_dispatch(-1) to process remaining upcalls.
594 upcall.upc_pending = morepending;
595 crit_count += TDPRI_CRIT;
596 copyout(&upcall.upc_pending, &lp->lwp_upcall->upc_pending,
597 sizeof(upcall.upc_pending));
598 copyout(&crit_count, (char *)upcall.upc_uthread + upcall.upc_critoff,
602 * Construct a stack frame and issue the upcall
604 regs = lp->lwp_md.md_regs;
605 upc_frame.rax = regs->tf_rax;
606 upc_frame.rcx = regs->tf_rcx;
607 upc_frame.rdx = regs->tf_rdx;
608 upc_frame.flags = regs->tf_rflags;
609 upc_frame.oldip = regs->tf_rip;
610 if (copyout(&upc_frame, (void *)(regs->tf_rsp - sizeof(upc_frame)),
611 sizeof(upc_frame)) != 0) {
612 kprintf("bad stack on upcall\n");
614 regs->tf_rax = (register_t)vu->vu_func;
615 regs->tf_rcx = (register_t)vu->vu_data;
616 regs->tf_rdx = (register_t)lp->lwp_upcall;
617 regs->tf_rip = (register_t)vu->vu_ctx;
618 regs->tf_rsp -= sizeof(upc_frame);
623 * fetchupcall occurs in the context of a system call, which means that
624 * we have to return EJUSTRETURN in order to prevent eax and edx from
625 * being overwritten by the syscall return value.
627 * if vu is not NULL we return the new context in %edx, the new data in %ecx,
628 * and the function pointer in %eax.
631 fetchupcall(struct vmupcall *vu, int morepending, void *rsp)
633 struct upc_frame upc_frame;
634 struct lwp *lp = curthread->td_lwp;
635 struct trapframe *regs;
637 struct upcall upcall;
640 regs = lp->lwp_md.md_regs;
642 error = copyout(&morepending, &lp->lwp_upcall->upc_pending, sizeof(int));
646 * This jumps us to the next ready context.
649 error = copyin(lp->lwp_upcall, &upcall, sizeof(upcall));
652 error = copyin((char *)upcall.upc_uthread + upcall.upc_critoff, &crit_count, sizeof(int));
653 crit_count += TDPRI_CRIT;
655 error = copyout(&crit_count, (char *)upcall.upc_uthread + upcall.upc_critoff, sizeof(int));
656 regs->tf_rax = (register_t)vu->vu_func;
657 regs->tf_rcx = (register_t)vu->vu_data;
658 regs->tf_rdx = (register_t)lp->lwp_upcall;
659 regs->tf_rip = (register_t)vu->vu_ctx;
660 regs->tf_rsp = (register_t)rsp;
663 * This returns us to the originally interrupted code.
665 error = copyin(rsp, &upc_frame, sizeof(upc_frame));
666 regs->tf_rax = upc_frame.rax;
667 regs->tf_rcx = upc_frame.rcx;
668 regs->tf_rdx = upc_frame.rdx;
669 regs->tf_rflags = (regs->tf_rflags & ~PSL_USERCHANGE) |
670 (upc_frame.flags & PSL_USERCHANGE);
671 regs->tf_rip = upc_frame.oldip;
672 regs->tf_rsp = (register_t)((char *)rsp + sizeof(upc_frame));
681 * cpu_idle() represents the idle LWKT. You cannot return from this function
682 * (unless you want to blow things up!). Instead we look for runnable threads
683 * and loop or halt as appropriate. Giant is not held on entry to the thread.
685 * The main loop is entered with a critical section held, we must release
686 * the critical section before doing anything else. lwkt_switch() will
687 * check for pending interrupts due to entering and exiting its own
690 * Note on cpu_idle_hlt: On an SMP system we rely on a scheduler IPI
691 * to wake a HLTed cpu up. However, there are cases where the idlethread
692 * will be entered with the possibility that no IPI will occur and in such
693 * cases lwkt_switch() sets TDF_IDLE_NOHLT.
695 static int cpu_idle_hlt = 1;
696 static int cpu_idle_hltcnt;
697 static int cpu_idle_spincnt;
698 SYSCTL_INT(_machdep, OID_AUTO, cpu_idle_hlt, CTLFLAG_RW,
699 &cpu_idle_hlt, 0, "Idle loop HLT enable");
700 SYSCTL_INT(_machdep, OID_AUTO, cpu_idle_hltcnt, CTLFLAG_RW,
701 &cpu_idle_hltcnt, 0, "Idle loop entry halts");
702 SYSCTL_INT(_machdep, OID_AUTO, cpu_idle_spincnt, CTLFLAG_RW,
703 &cpu_idle_spincnt, 0, "Idle loop entry spins");
708 struct thread *td = curthread;
709 struct mdglobaldata *gd = mdcpu;
712 KKASSERT(td->td_pri < TDPRI_CRIT);
716 * See if there are any LWKTs ready to go.
721 * The idle loop halts only if no threads are scheduleable
722 * and no signals have occured.
724 if (cpu_idle_hlt && !lwkt_runnable() &&
725 (td->td_flags & TDF_IDLE_NOHLT) == 0) {
727 if (!lwkt_runnable()) {
729 struct timeval tv1, tv2;
730 gettimeofday(&tv1, NULL);
732 umtx_sleep(&gd->mi.gd_runqmask, 0, 1000000);
734 gettimeofday(&tv2, NULL);
735 if (tv2.tv_usec - tv1.tv_usec +
736 (tv2.tv_sec - tv1.tv_sec) * 1000000
738 kprintf("cpu %d idlelock %08x %08x\n",
747 __asm __volatile("pause");
752 td->td_flags &= ~TDF_IDLE_NOHLT;
755 /*__asm __volatile("sti; pause");*/
756 __asm __volatile("pause");
758 /*__asm __volatile("sti");*/
768 * Called by the LWKT switch core with a critical section held if the only
769 * schedulable thread needs the MP lock and we couldn't get it. On
770 * a real cpu we just spin in the scheduler. In the virtual kernel
771 * we sleep for a bit.
774 cpu_mplock_contested(void)
780 * Called by the spinlock code with or without a critical section held
781 * when a spinlock is found to be seriously constested.
783 * We need to enter a critical section to prevent signals from recursing
787 cpu_spinlock_contested(void)
797 * Clear registers on exec
800 exec_setregs(u_long entry, u_long stack, u_long ps_strings)
802 struct thread *td = curthread;
803 struct lwp *lp = td->td_lwp;
804 struct pcb *pcb = td->td_pcb;
805 struct trapframe *regs = lp->lwp_md.md_regs;
807 /* was i386_user_cleanup() in NetBSD */
810 bzero((char *)regs, sizeof(struct trapframe));
811 regs->tf_rip = entry;
812 regs->tf_rsp = ((stack - 8) & ~0xFul) + 8; /* align the stack */
813 regs->tf_rdi = stack; /* argv */
814 regs->tf_rflags = PSL_USER | (regs->tf_rflags & PSL_T);
815 regs->tf_ss = _udatasel;
816 regs->tf_cs = _ucodesel;
817 regs->tf_rbx = ps_strings;
820 * Reset the hardware debug registers if they were in use.
821 * They won't have any meaning for the newly exec'd process.
823 if (pcb->pcb_flags & PCB_DBREGS) {
829 pcb->pcb_dr7 = 0; /* JG set bit 10? */
830 if (pcb == td->td_pcb) {
832 * Clear the debug registers on the running
833 * CPU, otherwise they will end up affecting
834 * the next process we switch to.
838 pcb->pcb_flags &= ~PCB_DBREGS;
842 * Initialize the math emulator (if any) for the current process.
843 * Actually, just clear the bit that says that the emulator has
844 * been initialized. Initialization is delayed until the process
845 * traps to the emulator (if it is done at all) mainly because
846 * emulators don't provide an entry point for initialization.
848 pcb->pcb_flags &= ~FP_SOFTFP;
851 * NOTE: do not set CR0_TS here. npxinit() must do it after clearing
852 * gd_npxthread. Otherwise a preemptive interrupt thread
853 * may panic in npxdna().
857 load_cr0(rcr0() | CR0_MP);
861 * NOTE: The MSR values must be correct so we can return to
862 * userland. gd_user_fs/gs must be correct so the switch
863 * code knows what the current MSR values are.
865 pcb->pcb_fsbase = 0; /* Values loaded from PCB on switch */
867 /* Initialize the npx (if any) for the current process. */
868 npxinit(__INITIAL_NPXCW__);
872 * note: linux emulator needs edx to be 0x0 on entry, which is
873 * handled in execve simply by setting the 64 bit syscall
885 cr0 |= CR0_NE; /* Done by npxinit() */
886 cr0 |= CR0_MP | CR0_TS; /* Done at every execve() too. */
887 cr0 |= CR0_WP | CR0_AM;
894 sysctl_machdep_adjkerntz(SYSCTL_HANDLER_ARGS)
897 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2,
899 if (!error && req->newptr)
904 SYSCTL_PROC(_machdep, CPU_ADJKERNTZ, adjkerntz, CTLTYPE_INT|CTLFLAG_RW,
905 &adjkerntz, 0, sysctl_machdep_adjkerntz, "I", "");
907 extern u_long bootdev; /* not a cdev_t - encoding is different */
908 SYSCTL_ULONG(_machdep, OID_AUTO, guessed_bootdev,
909 CTLFLAG_RD, &bootdev, 0, "Boot device (not in cdev_t format)");
912 * Initialize 386 and configure to run kernel
916 * Initialize segments & interrupt table
919 extern struct user *proc0paddr;
924 IDTVEC(div), IDTVEC(dbg), IDTVEC(nmi), IDTVEC(bpt), IDTVEC(ofl),
925 IDTVEC(bnd), IDTVEC(ill), IDTVEC(dna), IDTVEC(fpusegm),
926 IDTVEC(tss), IDTVEC(missing), IDTVEC(stk), IDTVEC(prot),
927 IDTVEC(page), IDTVEC(mchk), IDTVEC(rsvd), IDTVEC(fpu), IDTVEC(align),
928 IDTVEC(xmm), IDTVEC(dblfault),
929 IDTVEC(fast_syscall), IDTVEC(fast_syscall32);
932 #ifdef DEBUG_INTERRUPTS
933 extern inthand_t *Xrsvdary[256];
937 ptrace_set_pc(struct lwp *lp, unsigned long addr)
939 lp->lwp_md.md_regs->tf_rip = addr;
944 ptrace_single_step(struct lwp *lp)
946 lp->lwp_md.md_regs->tf_rflags |= PSL_T;
951 fill_regs(struct lwp *lp, struct reg *regs)
954 struct trapframe *tp;
956 tp = lp->lwp_md.md_regs;
957 bcopy(&tp->tf_rdi, ®s->r_rdi, sizeof(*regs));
959 pcb = lp->lwp_thread->td_pcb;
964 set_regs(struct lwp *lp, struct reg *regs)
967 struct trapframe *tp;
969 tp = lp->lwp_md.md_regs;
970 if (!EFL_SECURE(regs->r_rflags, tp->tf_rflags) ||
971 !CS_SECURE(regs->r_cs))
973 bcopy(®s->r_rdi, &tp->tf_rdi, sizeof(*regs));
974 pcb = lp->lwp_thread->td_pcb;
978 #ifndef CPU_DISABLE_SSE
980 fill_fpregs_xmm(struct savexmm *sv_xmm, struct save87 *sv_87)
982 struct env87 *penv_87 = &sv_87->sv_env;
983 struct envxmm *penv_xmm = &sv_xmm->sv_env;
986 /* FPU control/status */
987 penv_87->en_cw = penv_xmm->en_cw;
988 penv_87->en_sw = penv_xmm->en_sw;
989 penv_87->en_tw = penv_xmm->en_tw;
990 penv_87->en_fip = penv_xmm->en_fip;
991 penv_87->en_fcs = penv_xmm->en_fcs;
992 penv_87->en_opcode = penv_xmm->en_opcode;
993 penv_87->en_foo = penv_xmm->en_foo;
994 penv_87->en_fos = penv_xmm->en_fos;
997 for (i = 0; i < 8; ++i)
998 sv_87->sv_ac[i] = sv_xmm->sv_fp[i].fp_acc;
1000 sv_87->sv_ex_sw = sv_xmm->sv_ex_sw;
1004 set_fpregs_xmm(struct save87 *sv_87, struct savexmm *sv_xmm)
1006 struct env87 *penv_87 = &sv_87->sv_env;
1007 struct envxmm *penv_xmm = &sv_xmm->sv_env;
1010 /* FPU control/status */
1011 penv_xmm->en_cw = penv_87->en_cw;
1012 penv_xmm->en_sw = penv_87->en_sw;
1013 penv_xmm->en_tw = penv_87->en_tw;
1014 penv_xmm->en_fip = penv_87->en_fip;
1015 penv_xmm->en_fcs = penv_87->en_fcs;
1016 penv_xmm->en_opcode = penv_87->en_opcode;
1017 penv_xmm->en_foo = penv_87->en_foo;
1018 penv_xmm->en_fos = penv_87->en_fos;
1021 for (i = 0; i < 8; ++i)
1022 sv_xmm->sv_fp[i].fp_acc = sv_87->sv_ac[i];
1024 sv_xmm->sv_ex_sw = sv_87->sv_ex_sw;
1026 #endif /* CPU_DISABLE_SSE */
1029 fill_fpregs(struct lwp *lp, struct fpreg *fpregs)
1031 #ifndef CPU_DISABLE_SSE
1033 fill_fpregs_xmm(&lp->lwp_thread->td_pcb->pcb_save.sv_xmm,
1034 (struct save87 *)fpregs);
1037 #endif /* CPU_DISABLE_SSE */
1038 bcopy(&lp->lwp_thread->td_pcb->pcb_save.sv_87, fpregs, sizeof *fpregs);
1043 set_fpregs(struct lwp *lp, struct fpreg *fpregs)
1045 #ifndef CPU_DISABLE_SSE
1047 set_fpregs_xmm((struct save87 *)fpregs,
1048 &lp->lwp_thread->td_pcb->pcb_save.sv_xmm);
1051 #endif /* CPU_DISABLE_SSE */
1052 bcopy(fpregs, &lp->lwp_thread->td_pcb->pcb_save.sv_87, sizeof *fpregs);
1057 fill_dbregs(struct lwp *lp, struct dbreg *dbregs)
1063 set_dbregs(struct lwp *lp, struct dbreg *dbregs)
1070 * Return > 0 if a hardware breakpoint has been hit, and the
1071 * breakpoint was in user space. Return 0, otherwise.
1074 user_dbreg_trap(void)
1076 u_int32_t dr7, dr6; /* debug registers dr6 and dr7 */
1077 u_int32_t bp; /* breakpoint bits extracted from dr6 */
1078 int nbp; /* number of breakpoints that triggered */
1079 caddr_t addr[4]; /* breakpoint addresses */
1083 if ((dr7 & 0x000000ff) == 0) {
1085 * all GE and LE bits in the dr7 register are zero,
1086 * thus the trap couldn't have been caused by the
1087 * hardware debug registers
1094 bp = dr6 & 0x0000000f;
1098 * None of the breakpoint bits are set meaning this
1099 * trap was not caused by any of the debug registers
1105 * at least one of the breakpoints were hit, check to see
1106 * which ones and if any of them are user space addresses
1110 addr[nbp++] = (caddr_t)rdr0();
1113 addr[nbp++] = (caddr_t)rdr1();
1116 addr[nbp++] = (caddr_t)rdr2();
1119 addr[nbp++] = (caddr_t)rdr3();
1122 for (i=0; i<nbp; i++) {
1124 (caddr_t)VM_MAX_USER_ADDRESS) {
1126 * addr[i] is in user space
1133 * None of the breakpoints are in user space.
1146 cpu_feature = regs[3];
1152 Debugger(const char *msg)
1154 kprintf("Debugger(\"%s\") called.\n", msg);