2 * Copyright (C) 1991, 1992 Linus Torvalds
3 * Copyright (C) 2000, 2001, 2002 Andi Kleen, SuSE Labs
5 * Pentium III FXSR, SSE support
6 * Gareth Hughes <gareth@valinux.com>, May 2000
10 * Handle hardware traps and faults.
12 #include <linux/interrupt.h>
13 #include <linux/kallsyms.h>
14 #include <linux/spinlock.h>
15 #include <linux/kprobes.h>
16 #include <linux/uaccess.h>
17 #include <linux/utsname.h>
18 #include <linux/kdebug.h>
19 #include <linux/kernel.h>
20 #include <linux/module.h>
21 #include <linux/ptrace.h>
22 #include <linux/string.h>
23 #include <linux/unwind.h>
24 #include <linux/delay.h>
25 #include <linux/errno.h>
26 #include <linux/kexec.h>
27 #include <linux/sched.h>
28 #include <linux/timer.h>
29 #include <linux/init.h>
30 #include <linux/bug.h>
31 #include <linux/nmi.h>
33 #include <linux/smp.h>
37 #include <linux/ioport.h>
38 #include <linux/eisa.h>
42 #include <linux/mca.h>
45 #if defined(CONFIG_EDAC)
46 #include <linux/edac.h>
49 #include <asm/stacktrace.h>
50 #include <asm/processor.h>
51 #include <asm/debugreg.h>
52 #include <asm/atomic.h>
53 #include <asm/system.h>
54 #include <asm/unwind.h>
55 #include <asm/traps.h>
59 #include <mach_traps.h>
62 #include <asm/pgalloc.h>
63 #include <asm/proto.h>
66 #include <asm/processor-flags.h>
67 #include <asm/arch_hooks.h>
68 #include <asm/traps.h>
70 #include "cpu/mcheck/mce.h"
72 asmlinkage int system_call(void);
74 /* Do we ignore FPU interrupts ? */
78 * The IDT has to be page-aligned to simplify the Pentium
79 * F0 0F bug workaround.. We have a special link segment
82 gate_desc idt_table[256]
83 __attribute__((__section__(".data.idt"))) = { { { { 0, 0 } } }, };
86 DECLARE_BITMAP(used_vectors, NR_VECTORS);
87 EXPORT_SYMBOL_GPL(used_vectors);
89 static int ignore_nmis;
91 static inline void conditional_sti(struct pt_regs *regs)
93 if (regs->flags & X86_EFLAGS_IF)
97 static inline void preempt_conditional_sti(struct pt_regs *regs)
100 if (regs->flags & X86_EFLAGS_IF)
104 static inline void preempt_conditional_cli(struct pt_regs *regs)
106 if (regs->flags & X86_EFLAGS_IF)
113 die_if_kernel(const char *str, struct pt_regs *regs, long err)
115 if (!user_mode_vm(regs))
120 * Perform the lazy TSS's I/O bitmap copy. If the TSS has an
121 * invalid offset set (the LAZY one) and the faulting thread has
122 * a valid I/O bitmap pointer, we copy the I/O bitmap in the TSS,
123 * we set the offset field correctly and return 1.
125 static int lazy_iobitmap_copy(void)
127 struct thread_struct *thread;
128 struct tss_struct *tss;
132 tss = &per_cpu(init_tss, cpu);
133 thread = ¤t->thread;
135 if (tss->x86_tss.io_bitmap_base == INVALID_IO_BITMAP_OFFSET_LAZY &&
136 thread->io_bitmap_ptr) {
137 memcpy(tss->io_bitmap, thread->io_bitmap_ptr,
138 thread->io_bitmap_max);
140 * If the previously set map was extending to higher ports
141 * than the current one, pad extra space with 0xff (no access).
143 if (thread->io_bitmap_max < tss->io_bitmap_max) {
144 memset((char *) tss->io_bitmap +
145 thread->io_bitmap_max, 0xff,
146 tss->io_bitmap_max - thread->io_bitmap_max);
148 tss->io_bitmap_max = thread->io_bitmap_max;
149 tss->x86_tss.io_bitmap_base = IO_BITMAP_OFFSET;
150 tss->io_bitmap_owner = thread;
161 static void __kprobes
162 do_trap(int trapnr, int signr, char *str, struct pt_regs *regs,
163 long error_code, siginfo_t *info)
165 struct task_struct *tsk = current;
168 if (regs->flags & X86_VM_MASK) {
170 * traps 0, 1, 3, 4, and 5 should be forwarded to vm86.
171 * On nmi (interrupt 2), do_trap should not be called.
179 if (!user_mode(regs))
186 * We want error_code and trap_no set for userspace faults and
187 * kernelspace faults which result in die(), but not
188 * kernelspace faults which are fixed up. die() gives the
189 * process no chance to handle the signal and notice the
190 * kernel fault information, so that won't result in polluting
191 * the information about previously queued, but not yet
192 * delivered, faults. See also do_general_protection below.
194 tsk->thread.error_code = error_code;
195 tsk->thread.trap_no = trapnr;
198 if (show_unhandled_signals && unhandled_signal(tsk, signr) &&
199 printk_ratelimit()) {
201 "%s[%d] trap %s ip:%lx sp:%lx error:%lx",
202 tsk->comm, tsk->pid, str,
203 regs->ip, regs->sp, error_code);
204 print_vma_addr(" in ", regs->ip);
210 force_sig_info(signr, info, tsk);
212 force_sig(signr, tsk);
216 if (!fixup_exception(regs)) {
217 tsk->thread.error_code = error_code;
218 tsk->thread.trap_no = trapnr;
219 die(str, regs, error_code);
225 if (handle_vm86_trap((struct kernel_vm86_regs *) regs,
232 #define DO_ERROR(trapnr, signr, str, name) \
233 dotraplinkage void do_##name(struct pt_regs *regs, long error_code) \
235 if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \
238 conditional_sti(regs); \
239 do_trap(trapnr, signr, str, regs, error_code, NULL); \
242 #define DO_ERROR_INFO(trapnr, signr, str, name, sicode, siaddr) \
243 dotraplinkage void do_##name(struct pt_regs *regs, long error_code) \
246 info.si_signo = signr; \
248 info.si_code = sicode; \
249 info.si_addr = (void __user *)siaddr; \
250 if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \
253 conditional_sti(regs); \
254 do_trap(trapnr, signr, str, regs, error_code, &info); \
257 DO_ERROR_INFO(0, SIGFPE, "divide error", divide_error, FPE_INTDIV, regs->ip)
258 DO_ERROR(4, SIGSEGV, "overflow", overflow)
259 DO_ERROR(5, SIGSEGV, "bounds", bounds)
260 DO_ERROR_INFO(6, SIGILL, "invalid opcode", invalid_op, ILL_ILLOPN, regs->ip)
261 DO_ERROR(9, SIGFPE, "coprocessor segment overrun", coprocessor_segment_overrun)
262 DO_ERROR(10, SIGSEGV, "invalid TSS", invalid_TSS)
263 DO_ERROR(11, SIGBUS, "segment not present", segment_not_present)
265 DO_ERROR(12, SIGBUS, "stack segment", stack_segment)
267 DO_ERROR_INFO(17, SIGBUS, "alignment check", alignment_check, BUS_ADRALN, 0)
270 /* Runs on IST stack */
271 dotraplinkage void do_stack_segment(struct pt_regs *regs, long error_code)
273 if (notify_die(DIE_TRAP, "stack segment", regs, error_code,
274 12, SIGBUS) == NOTIFY_STOP)
276 preempt_conditional_sti(regs);
277 do_trap(12, SIGBUS, "stack segment", regs, error_code, NULL);
278 preempt_conditional_cli(regs);
281 dotraplinkage void do_double_fault(struct pt_regs *regs, long error_code)
283 static const char str[] = "double fault";
284 struct task_struct *tsk = current;
286 /* Return not checked because double check cannot be ignored */
287 notify_die(DIE_TRAP, str, regs, error_code, 8, SIGSEGV);
289 tsk->thread.error_code = error_code;
290 tsk->thread.trap_no = 8;
293 * This is always a kernel trap and never fixable (and thus must
297 die(str, regs, error_code);
301 dotraplinkage void __kprobes
302 do_general_protection(struct pt_regs *regs, long error_code)
304 struct task_struct *tsk;
306 conditional_sti(regs);
309 if (lazy_iobitmap_copy()) {
310 /* restart the faulting instruction */
314 if (regs->flags & X86_VM_MASK)
319 if (!user_mode(regs))
322 tsk->thread.error_code = error_code;
323 tsk->thread.trap_no = 13;
325 if (show_unhandled_signals && unhandled_signal(tsk, SIGSEGV) &&
326 printk_ratelimit()) {
328 "%s[%d] general protection ip:%lx sp:%lx error:%lx",
329 tsk->comm, task_pid_nr(tsk),
330 regs->ip, regs->sp, error_code);
331 print_vma_addr(" in ", regs->ip);
335 force_sig(SIGSEGV, tsk);
341 handle_vm86_fault((struct kernel_vm86_regs *) regs, error_code);
346 if (fixup_exception(regs))
349 tsk->thread.error_code = error_code;
350 tsk->thread.trap_no = 13;
351 if (notify_die(DIE_GPF, "general protection fault", regs,
352 error_code, 13, SIGSEGV) == NOTIFY_STOP)
354 die("general protection fault", regs, error_code);
357 static notrace __kprobes void
358 mem_parity_error(unsigned char reason, struct pt_regs *regs)
361 "Uhhuh. NMI received for unknown reason %02x on CPU %d.\n",
362 reason, smp_processor_id());
365 "You have some hardware problem, likely on the PCI bus.\n");
367 #if defined(CONFIG_EDAC)
368 if (edac_handler_set()) {
369 edac_atomic_assert_error();
374 if (panic_on_unrecovered_nmi)
375 panic("NMI: Not continuing");
377 printk(KERN_EMERG "Dazed and confused, but trying to continue\n");
379 /* Clear and disable the memory parity error line. */
380 reason = (reason & 0xf) | 4;
384 static notrace __kprobes void
385 io_check_error(unsigned char reason, struct pt_regs *regs)
389 printk(KERN_EMERG "NMI: IOCK error (debug interrupt?)\n");
390 show_registers(regs);
392 /* Re-enable the IOCK line, wait for a few seconds */
393 reason = (reason & 0xf) | 8;
404 static notrace __kprobes void
405 unknown_nmi_error(unsigned char reason, struct pt_regs *regs)
407 if (notify_die(DIE_NMIUNKNOWN, "nmi", regs, reason, 2, SIGINT) ==
412 * Might actually be able to figure out what the guilty party
421 "Uhhuh. NMI received for unknown reason %02x on CPU %d.\n",
422 reason, smp_processor_id());
424 printk(KERN_EMERG "Do you have a strange power saving mode enabled?\n");
425 if (panic_on_unrecovered_nmi)
426 panic("NMI: Not continuing");
428 printk(KERN_EMERG "Dazed and confused, but trying to continue\n");
431 static notrace __kprobes void default_do_nmi(struct pt_regs *regs)
433 unsigned char reason = 0;
436 cpu = smp_processor_id();
438 /* Only the BSP gets external NMIs from the system. */
440 reason = get_nmi_reason();
442 if (!(reason & 0xc0)) {
443 if (notify_die(DIE_NMI_IPI, "nmi_ipi", regs, reason, 2, SIGINT)
446 #ifdef CONFIG_X86_LOCAL_APIC
448 * Ok, so this is none of the documented NMI sources,
449 * so it must be the NMI watchdog.
451 if (nmi_watchdog_tick(regs, reason))
453 if (!do_nmi_callback(regs, cpu))
454 unknown_nmi_error(reason, regs);
456 unknown_nmi_error(reason, regs);
461 if (notify_die(DIE_NMI, "nmi", regs, reason, 2, SIGINT) == NOTIFY_STOP)
464 /* AK: following checks seem to be broken on modern chipsets. FIXME */
466 mem_parity_error(reason, regs);
468 io_check_error(reason, regs);
471 * Reassert NMI in case it became active meanwhile
472 * as it's edge-triggered:
478 dotraplinkage notrace __kprobes void
479 do_nmi(struct pt_regs *regs, long error_code)
483 inc_irq_stat(__nmi_count);
486 default_do_nmi(regs);
497 void restart_nmi(void)
503 /* May run on IST stack. */
504 dotraplinkage void __kprobes do_int3(struct pt_regs *regs, long error_code)
506 #ifdef CONFIG_KPROBES
507 if (notify_die(DIE_INT3, "int3", regs, error_code, 3, SIGTRAP)
511 if (notify_die(DIE_TRAP, "int3", regs, error_code, 3, SIGTRAP)
516 preempt_conditional_sti(regs);
517 do_trap(3, SIGTRAP, "int3", regs, error_code, NULL);
518 preempt_conditional_cli(regs);
523 * Help handler running on IST stack to switch back to user stack
524 * for scheduling or signal handling. The actual stack switch is done in
527 asmlinkage __kprobes struct pt_regs *sync_regs(struct pt_regs *eregs)
529 struct pt_regs *regs = eregs;
530 /* Did already sync */
531 if (eregs == (struct pt_regs *)eregs->sp)
533 /* Exception from user space */
534 else if (user_mode(eregs))
535 regs = task_pt_regs(current);
537 * Exception from kernel and interrupts are enabled. Move to
538 * kernel process stack.
540 else if (eregs->flags & X86_EFLAGS_IF)
541 regs = (struct pt_regs *)(eregs->sp -= sizeof(struct pt_regs));
549 * Our handling of the processor debug registers is non-trivial.
550 * We do not clear them on entry and exit from the kernel. Therefore
551 * it is possible to get a watchpoint trap here from inside the kernel.
552 * However, the code in ./ptrace.c has ensured that the user can
553 * only set watchpoints on userspace addresses. Therefore the in-kernel
554 * watchpoint trap can only occur in code which is reading/writing
555 * from user space. Such code must not hold kernel locks (since it
556 * can equally take a page fault), therefore it is safe to call
557 * force_sig_info even though that claims and releases locks.
559 * Code in ./signal.c ensures that the debug control register
560 * is restored before we deliver any signal, and therefore that
561 * user code runs with the correct debug control register even though
564 * Being careful here means that we don't have to be as careful in a
565 * lot of more complicated places (task switching can be a bit lazy
566 * about restoring all the debug state, and ptrace doesn't have to
567 * find every occurrence of the TF bit that could be saved away even
570 * May run on IST stack.
572 dotraplinkage void __kprobes do_debug(struct pt_regs *regs, long error_code)
574 struct task_struct *tsk = current;
575 unsigned long condition;
578 get_debugreg(condition, 6);
581 * The processor cleared BTF, so don't mark that we need it set.
583 clear_tsk_thread_flag(tsk, TIF_DEBUGCTLMSR);
584 tsk->thread.debugctlmsr = 0;
586 if (notify_die(DIE_DEBUG, "debug", regs, condition, error_code,
587 SIGTRAP) == NOTIFY_STOP)
590 /* It's safe to allow irq's after DR6 has been saved */
591 preempt_conditional_sti(regs);
593 /* Mask out spurious debug traps due to lazy DR7 setting */
594 if (condition & (DR_TRAP0|DR_TRAP1|DR_TRAP2|DR_TRAP3)) {
595 if (!tsk->thread.debugreg7)
600 if (regs->flags & X86_VM_MASK)
604 /* Save debug status register where ptrace can see it */
605 tsk->thread.debugreg6 = condition;
608 * Single-stepping through TF: make sure we ignore any events in
609 * kernel space (but re-enable TF when returning to user mode).
611 if (condition & DR_STEP) {
612 if (!user_mode(regs))
613 goto clear_TF_reenable;
616 si_code = get_si_code(condition);
617 /* Ok, finally something we can handle */
618 send_sigtrap(tsk, regs, error_code, si_code);
621 * Disable additional traps. They'll be re-enabled when
622 * the signal is delivered.
626 preempt_conditional_cli(regs);
631 handle_vm86_trap((struct kernel_vm86_regs *) regs, error_code, 1);
632 preempt_conditional_cli(regs);
637 set_tsk_thread_flag(tsk, TIF_SINGLESTEP);
638 regs->flags &= ~X86_EFLAGS_TF;
639 preempt_conditional_cli(regs);
644 static int kernel_math_error(struct pt_regs *regs, const char *str, int trapnr)
646 if (fixup_exception(regs))
649 notify_die(DIE_GPF, str, regs, 0, trapnr, SIGFPE);
650 /* Illegal floating point operation in the kernel */
651 current->thread.trap_no = trapnr;
658 * Note that we play around with the 'TS' bit in an attempt to get
659 * the correct behaviour even in the presence of the asynchronous
662 void math_error(void __user *ip)
664 struct task_struct *task;
666 unsigned short cwd, swd, err;
669 * Save the info for the exception handler and clear the error.
673 task->thread.trap_no = 16;
674 task->thread.error_code = 0;
675 info.si_signo = SIGFPE;
679 * (~cwd & swd) will mask out exceptions that are not set to unmasked
680 * status. 0x3f is the exception bits in these regs, 0x200 is the
681 * C1 reg you need in case of a stack fault, 0x040 is the stack
682 * fault bit. We should only be taking one exception at a time,
683 * so if this combination doesn't produce any single exception,
684 * then we have a bad program that isn't synchronizing its FPU usage
685 * and it will suffer the consequences since we won't be able to
686 * fully reproduce the context of the exception
688 cwd = get_fpu_cwd(task);
689 swd = get_fpu_swd(task);
693 if (err & 0x001) { /* Invalid op */
695 * swd & 0x240 == 0x040: Stack Underflow
696 * swd & 0x240 == 0x240: Stack Overflow
697 * User must clear the SF bit (0x40) if set
699 info.si_code = FPE_FLTINV;
700 } else if (err & 0x004) { /* Divide by Zero */
701 info.si_code = FPE_FLTDIV;
702 } else if (err & 0x008) { /* Overflow */
703 info.si_code = FPE_FLTOVF;
704 } else if (err & 0x012) { /* Denormal, Underflow */
705 info.si_code = FPE_FLTUND;
706 } else if (err & 0x020) { /* Precision */
707 info.si_code = FPE_FLTRES;
710 * If we're using IRQ 13, or supposedly even some trap 16
711 * implementations, it's possible we get a spurious trap...
713 return; /* Spurious trap, no error */
715 force_sig_info(SIGFPE, &info, task);
718 dotraplinkage void do_coprocessor_error(struct pt_regs *regs, long error_code)
720 conditional_sti(regs);
725 if (!user_mode(regs) &&
726 kernel_math_error(regs, "kernel x87 math error", 16))
730 math_error((void __user *)regs->ip);
733 static void simd_math_error(void __user *ip)
735 struct task_struct *task;
737 unsigned short mxcsr;
740 * Save the info for the exception handler and clear the error.
744 task->thread.trap_no = 19;
745 task->thread.error_code = 0;
746 info.si_signo = SIGFPE;
748 info.si_code = __SI_FAULT;
751 * The SIMD FPU exceptions are handled a little differently, as there
752 * is only a single status/control register. Thus, to determine which
753 * unmasked exception was caught we must mask the exception mask bits
754 * at 0x1f80, and then use these to mask the exception bits at 0x3f.
756 mxcsr = get_fpu_mxcsr(task);
757 switch (~((mxcsr & 0x1f80) >> 7) & (mxcsr & 0x3f)) {
761 case 0x001: /* Invalid Op */
762 info.si_code = FPE_FLTINV;
764 case 0x002: /* Denormalize */
765 case 0x010: /* Underflow */
766 info.si_code = FPE_FLTUND;
768 case 0x004: /* Zero Divide */
769 info.si_code = FPE_FLTDIV;
771 case 0x008: /* Overflow */
772 info.si_code = FPE_FLTOVF;
774 case 0x020: /* Precision */
775 info.si_code = FPE_FLTRES;
778 force_sig_info(SIGFPE, &info, task);
782 do_simd_coprocessor_error(struct pt_regs *regs, long error_code)
784 conditional_sti(regs);
788 /* Handle SIMD FPU exceptions on PIII+ processors. */
790 simd_math_error((void __user *)regs->ip);
794 * Handle strange cache flush from user space exception
795 * in all other cases. This is undocumented behaviour.
797 if (regs->flags & X86_VM_MASK) {
798 handle_vm86_fault((struct kernel_vm86_regs *)regs, error_code);
801 current->thread.trap_no = 19;
802 current->thread.error_code = error_code;
803 die_if_kernel("cache flush denied", regs, error_code);
804 force_sig(SIGSEGV, current);
806 if (!user_mode(regs) &&
807 kernel_math_error(regs, "kernel simd math error", 19))
809 simd_math_error((void __user *)regs->ip);
814 do_spurious_interrupt_bug(struct pt_regs *regs, long error_code)
816 conditional_sti(regs);
818 /* No need to warn about this any longer. */
819 printk(KERN_INFO "Ignoring P6 Local APIC Spurious Interrupt Bug...\n");
824 unsigned long patch_espfix_desc(unsigned long uesp, unsigned long kesp)
826 struct desc_struct *gdt = get_cpu_gdt_table(smp_processor_id());
827 unsigned long base = (kesp - uesp) & -THREAD_SIZE;
828 unsigned long new_kesp = kesp - base;
829 unsigned long lim_pages = (new_kesp | (THREAD_SIZE - 1)) >> PAGE_SHIFT;
830 __u64 desc = *(__u64 *)&gdt[GDT_ENTRY_ESPFIX_SS];
832 /* Set up base for espfix segment */
833 desc &= 0x00f0ff0000000000ULL;
834 desc |= ((((__u64)base) << 16) & 0x000000ffffff0000ULL) |
835 ((((__u64)base) << 32) & 0xff00000000000000ULL) |
836 ((((__u64)lim_pages) << 32) & 0x000f000000000000ULL) |
837 (lim_pages & 0xffff);
838 *(__u64 *)&gdt[GDT_ENTRY_ESPFIX_SS] = desc;
843 asmlinkage void __attribute__((weak)) smp_thermal_interrupt(void)
847 asmlinkage void __attribute__((weak)) mce_threshold_interrupt(void)
853 * 'math_state_restore()' saves the current math information in the
854 * old math state array, and gets the new ones from the current task
856 * Careful.. There are problems with IBM-designed IRQ13 behaviour.
857 * Don't touch unless you *really* know how it works.
859 * Must be called with kernel preemption disabled (in this case,
860 * local interrupts are disabled at the call-site in entry.S).
862 asmlinkage void math_state_restore(void)
864 struct thread_info *thread = current_thread_info();
865 struct task_struct *tsk = thread->task;
867 if (!tsk_used_math(tsk)) {
870 * does a slab alloc which can sleep
876 do_group_exit(SIGKILL);
882 clts(); /* Allow maths ops (or we recurse) */
887 * Paranoid restore. send a SIGSEGV if we fail to restore the state.
889 if (unlikely(restore_fpu_checking(tsk))) {
891 force_sig(SIGSEGV, tsk);
895 thread->status |= TS_USEDFPU; /* So we fnsave on switch_to() */
898 EXPORT_SYMBOL_GPL(math_state_restore);
900 #ifndef CONFIG_MATH_EMULATION
901 asmlinkage void math_emulate(long arg)
904 "math-emulation not enabled and no coprocessor found.\n");
905 printk(KERN_EMERG "killing %s.\n", current->comm);
906 force_sig(SIGFPE, current);
909 #endif /* CONFIG_MATH_EMULATION */
911 dotraplinkage void __kprobes
912 do_device_not_available(struct pt_regs *regs, long error)
915 if (read_cr0() & X86_CR0_EM) {
916 conditional_sti(regs);
919 math_state_restore(); /* interrupts still off */
920 conditional_sti(regs);
923 math_state_restore();
928 dotraplinkage void do_iret_error(struct pt_regs *regs, long error_code)
933 info.si_signo = SIGILL;
935 info.si_code = ILL_BADSTK;
937 if (notify_die(DIE_TRAP, "iret exception",
938 regs, error_code, 32, SIGILL) == NOTIFY_STOP)
940 do_trap(32, SIGILL, "iret exception", regs, error_code, &info);
944 void __init trap_init(void)
949 void __iomem *p = early_ioremap(0x0FFFD9, 4);
951 if (readl(p) == 'E' + ('I'<<8) + ('S'<<16) + ('A'<<24))
956 set_intr_gate(0, ÷_error);
957 set_intr_gate_ist(1, &debug, DEBUG_STACK);
958 set_intr_gate_ist(2, &nmi, NMI_STACK);
959 /* int3 can be called from all */
960 set_system_intr_gate_ist(3, &int3, DEBUG_STACK);
961 /* int4 can be called from all */
962 set_system_intr_gate(4, &overflow);
963 set_intr_gate(5, &bounds);
964 set_intr_gate(6, &invalid_op);
965 set_intr_gate(7, &device_not_available);
967 set_task_gate(8, GDT_ENTRY_DOUBLEFAULT_TSS);
969 set_intr_gate_ist(8, &double_fault, DOUBLEFAULT_STACK);
971 set_intr_gate(9, &coprocessor_segment_overrun);
972 set_intr_gate(10, &invalid_TSS);
973 set_intr_gate(11, &segment_not_present);
974 set_intr_gate_ist(12, &stack_segment, STACKFAULT_STACK);
975 set_intr_gate(13, &general_protection);
976 set_intr_gate(14, &page_fault);
977 set_intr_gate(15, &spurious_interrupt_bug);
978 set_intr_gate(16, &coprocessor_error);
979 set_intr_gate(17, &alignment_check);
980 #ifdef CONFIG_X86_MCE
981 set_intr_gate_ist(18, &machine_check, MCE_STACK);
983 set_intr_gate(19, &simd_coprocessor_error);
985 #ifdef CONFIG_IA32_EMULATION
986 set_system_intr_gate(IA32_SYSCALL_VECTOR, ia32_syscall);
991 printk(KERN_INFO "Enabling fast FPU save and restore... ");
992 set_in_cr4(X86_CR4_OSFXSR);
997 "Enabling unmasked SIMD FPU exception support... ");
998 set_in_cr4(X86_CR4_OSXMMEXCPT);
1002 set_system_trap_gate(SYSCALL_VECTOR, &system_call);
1005 /* Reserve all the builtin and the syscall vector: */
1006 for (i = 0; i < FIRST_EXTERNAL_VECTOR; i++)
1007 set_bit(i, used_vectors);
1009 #ifdef CONFIG_X86_64
1010 set_bit(IA32_SYSCALL_VECTOR, used_vectors);
1012 set_bit(SYSCALL_VECTOR, used_vectors);
1015 * Should be a barrier for any external CPU state:
1019 #ifdef CONFIG_X86_32