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/kdebug.h>
18 #include <linux/kernel.h>
19 #include <linux/module.h>
20 #include <linux/ptrace.h>
21 #include <linux/string.h>
22 #include <linux/delay.h>
23 #include <linux/errno.h>
24 #include <linux/kexec.h>
25 #include <linux/sched.h>
26 #include <linux/timer.h>
27 #include <linux/init.h>
28 #include <linux/bug.h>
29 #include <linux/nmi.h>
31 #include <linux/smp.h>
35 #include <linux/ioport.h>
36 #include <linux/eisa.h>
40 #include <linux/mca.h>
43 #if defined(CONFIG_EDAC)
44 #include <linux/edac.h>
47 #include <asm/kmemcheck.h>
48 #include <asm/stacktrace.h>
49 #include <asm/processor.h>
50 #include <asm/debugreg.h>
51 #include <asm/atomic.h>
52 #include <asm/system.h>
53 #include <asm/traps.h>
58 #include <asm/mach_traps.h>
61 #include <asm/x86_init.h>
62 #include <asm/pgalloc.h>
63 #include <asm/proto.h>
65 #include <asm/processor-flags.h>
66 #include <asm/setup.h>
68 asmlinkage
int system_call(void);
70 /* Do we ignore FPU interrupts ? */
74 * The IDT has to be page-aligned to simplify the Pentium
75 * F0 0F bug workaround.. We have a special link segment
78 gate_desc idt_table
[NR_VECTORS
]
79 __attribute__((__section__(".data.idt"))) = { { { { 0, 0 } } }, };
82 DECLARE_BITMAP(used_vectors
, NR_VECTORS
);
83 EXPORT_SYMBOL_GPL(used_vectors
);
85 static int ignore_nmis
;
87 static inline void conditional_sti(struct pt_regs
*regs
)
89 if (regs
->flags
& X86_EFLAGS_IF
)
93 static inline void preempt_conditional_sti(struct pt_regs
*regs
)
96 if (regs
->flags
& X86_EFLAGS_IF
)
100 static inline void conditional_cli(struct pt_regs
*regs
)
102 if (regs
->flags
& X86_EFLAGS_IF
)
106 static inline void preempt_conditional_cli(struct pt_regs
*regs
)
108 if (regs
->flags
& X86_EFLAGS_IF
)
115 die_if_kernel(const char *str
, struct pt_regs
*regs
, long err
)
117 if (!user_mode_vm(regs
))
122 static void __kprobes
123 do_trap(int trapnr
, int signr
, char *str
, struct pt_regs
*regs
,
124 long error_code
, siginfo_t
*info
)
126 struct task_struct
*tsk
= current
;
129 if (regs
->flags
& X86_VM_MASK
) {
131 * traps 0, 1, 3, 4, and 5 should be forwarded to vm86.
132 * On nmi (interrupt 2), do_trap should not be called.
140 if (!user_mode(regs
))
147 * We want error_code and trap_no set for userspace faults and
148 * kernelspace faults which result in die(), but not
149 * kernelspace faults which are fixed up. die() gives the
150 * process no chance to handle the signal and notice the
151 * kernel fault information, so that won't result in polluting
152 * the information about previously queued, but not yet
153 * delivered, faults. See also do_general_protection below.
155 tsk
->thread
.error_code
= error_code
;
156 tsk
->thread
.trap_no
= trapnr
;
159 if (show_unhandled_signals
&& unhandled_signal(tsk
, signr
) &&
160 printk_ratelimit()) {
162 "%s[%d] trap %s ip:%lx sp:%lx error:%lx",
163 tsk
->comm
, tsk
->pid
, str
,
164 regs
->ip
, regs
->sp
, error_code
);
165 print_vma_addr(" in ", regs
->ip
);
171 force_sig_info(signr
, info
, tsk
);
173 force_sig(signr
, tsk
);
177 if (!fixup_exception(regs
)) {
178 tsk
->thread
.error_code
= error_code
;
179 tsk
->thread
.trap_no
= trapnr
;
180 die(str
, regs
, error_code
);
186 if (handle_vm86_trap((struct kernel_vm86_regs
*) regs
,
193 #define DO_ERROR(trapnr, signr, str, name) \
194 dotraplinkage void do_##name(struct pt_regs *regs, long error_code) \
196 if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \
199 conditional_sti(regs); \
200 do_trap(trapnr, signr, str, regs, error_code, NULL); \
203 #define DO_ERROR_INFO(trapnr, signr, str, name, sicode, siaddr) \
204 dotraplinkage void do_##name(struct pt_regs *regs, long error_code) \
207 info.si_signo = signr; \
209 info.si_code = sicode; \
210 info.si_addr = (void __user *)siaddr; \
211 if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \
214 conditional_sti(regs); \
215 do_trap(trapnr, signr, str, regs, error_code, &info); \
218 DO_ERROR_INFO(0, SIGFPE
, "divide error", divide_error
, FPE_INTDIV
, regs
->ip
)
219 DO_ERROR(4, SIGSEGV
, "overflow", overflow
)
220 DO_ERROR(5, SIGSEGV
, "bounds", bounds
)
221 DO_ERROR_INFO(6, SIGILL
, "invalid opcode", invalid_op
, ILL_ILLOPN
, regs
->ip
)
222 DO_ERROR(9, SIGFPE
, "coprocessor segment overrun", coprocessor_segment_overrun
)
223 DO_ERROR(10, SIGSEGV
, "invalid TSS", invalid_TSS
)
224 DO_ERROR(11, SIGBUS
, "segment not present", segment_not_present
)
226 DO_ERROR(12, SIGBUS
, "stack segment", stack_segment
)
228 DO_ERROR_INFO(17, SIGBUS
, "alignment check", alignment_check
, BUS_ADRALN
, 0)
231 /* Runs on IST stack */
232 dotraplinkage
void do_stack_segment(struct pt_regs
*regs
, long error_code
)
234 if (notify_die(DIE_TRAP
, "stack segment", regs
, error_code
,
235 12, SIGBUS
) == NOTIFY_STOP
)
237 preempt_conditional_sti(regs
);
238 do_trap(12, SIGBUS
, "stack segment", regs
, error_code
, NULL
);
239 preempt_conditional_cli(regs
);
242 dotraplinkage
void do_double_fault(struct pt_regs
*regs
, long error_code
)
244 static const char str
[] = "double fault";
245 struct task_struct
*tsk
= current
;
247 /* Return not checked because double check cannot be ignored */
248 notify_die(DIE_TRAP
, str
, regs
, error_code
, 8, SIGSEGV
);
250 tsk
->thread
.error_code
= error_code
;
251 tsk
->thread
.trap_no
= 8;
254 * This is always a kernel trap and never fixable (and thus must
258 die(str
, regs
, error_code
);
262 dotraplinkage
void __kprobes
263 do_general_protection(struct pt_regs
*regs
, long error_code
)
265 struct task_struct
*tsk
;
267 conditional_sti(regs
);
270 if (regs
->flags
& X86_VM_MASK
)
275 if (!user_mode(regs
))
278 tsk
->thread
.error_code
= error_code
;
279 tsk
->thread
.trap_no
= 13;
281 if (show_unhandled_signals
&& unhandled_signal(tsk
, SIGSEGV
) &&
282 printk_ratelimit()) {
284 "%s[%d] general protection ip:%lx sp:%lx error:%lx",
285 tsk
->comm
, task_pid_nr(tsk
),
286 regs
->ip
, regs
->sp
, error_code
);
287 print_vma_addr(" in ", regs
->ip
);
291 force_sig(SIGSEGV
, tsk
);
297 handle_vm86_fault((struct kernel_vm86_regs
*) regs
, error_code
);
302 if (fixup_exception(regs
))
305 tsk
->thread
.error_code
= error_code
;
306 tsk
->thread
.trap_no
= 13;
307 if (notify_die(DIE_GPF
, "general protection fault", regs
,
308 error_code
, 13, SIGSEGV
) == NOTIFY_STOP
)
310 die("general protection fault", regs
, error_code
);
313 static notrace __kprobes
void
314 mem_parity_error(unsigned char reason
, struct pt_regs
*regs
)
317 "Uhhuh. NMI received for unknown reason %02x on CPU %d.\n",
318 reason
, smp_processor_id());
321 "You have some hardware problem, likely on the PCI bus.\n");
323 #if defined(CONFIG_EDAC)
324 if (edac_handler_set()) {
325 edac_atomic_assert_error();
330 if (panic_on_unrecovered_nmi
)
331 panic("NMI: Not continuing");
333 printk(KERN_EMERG
"Dazed and confused, but trying to continue\n");
335 /* Clear and disable the memory parity error line. */
336 reason
= (reason
& 0xf) | 4;
340 static notrace __kprobes
void
341 io_check_error(unsigned char reason
, struct pt_regs
*regs
)
345 printk(KERN_EMERG
"NMI: IOCK error (debug interrupt?)\n");
346 show_registers(regs
);
349 panic("NMI IOCK error: Not continuing");
351 /* Re-enable the IOCK line, wait for a few seconds */
352 reason
= (reason
& 0xf) | 8;
363 static notrace __kprobes
void
364 unknown_nmi_error(unsigned char reason
, struct pt_regs
*regs
)
366 if (notify_die(DIE_NMIUNKNOWN
, "nmi", regs
, reason
, 2, SIGINT
) ==
371 * Might actually be able to figure out what the guilty party
380 "Uhhuh. NMI received for unknown reason %02x on CPU %d.\n",
381 reason
, smp_processor_id());
383 printk(KERN_EMERG
"Do you have a strange power saving mode enabled?\n");
384 if (panic_on_unrecovered_nmi
)
385 panic("NMI: Not continuing");
387 printk(KERN_EMERG
"Dazed and confused, but trying to continue\n");
390 static notrace __kprobes
void default_do_nmi(struct pt_regs
*regs
)
392 unsigned char reason
= 0;
395 cpu
= smp_processor_id();
397 /* Only the BSP gets external NMIs from the system. */
399 reason
= get_nmi_reason();
401 if (!(reason
& 0xc0)) {
402 if (notify_die(DIE_NMI_IPI
, "nmi_ipi", regs
, reason
, 2, SIGINT
)
405 #ifdef CONFIG_X86_LOCAL_APIC
407 * Ok, so this is none of the documented NMI sources,
408 * so it must be the NMI watchdog.
410 if (nmi_watchdog_tick(regs
, reason
))
412 if (!do_nmi_callback(regs
, cpu
))
413 unknown_nmi_error(reason
, regs
);
415 unknown_nmi_error(reason
, regs
);
420 if (notify_die(DIE_NMI
, "nmi", regs
, reason
, 2, SIGINT
) == NOTIFY_STOP
)
423 /* AK: following checks seem to be broken on modern chipsets. FIXME */
425 mem_parity_error(reason
, regs
);
427 io_check_error(reason
, regs
);
430 * Reassert NMI in case it became active meanwhile
431 * as it's edge-triggered:
437 dotraplinkage notrace __kprobes
void
438 do_nmi(struct pt_regs
*regs
, long error_code
)
442 inc_irq_stat(__nmi_count
);
445 default_do_nmi(regs
);
456 void restart_nmi(void)
462 /* May run on IST stack. */
463 dotraplinkage
void __kprobes
do_int3(struct pt_regs
*regs
, long error_code
)
465 #ifdef CONFIG_KPROBES
466 if (notify_die(DIE_INT3
, "int3", regs
, error_code
, 3, SIGTRAP
)
470 if (notify_die(DIE_TRAP
, "int3", regs
, error_code
, 3, SIGTRAP
)
475 preempt_conditional_sti(regs
);
476 do_trap(3, SIGTRAP
, "int3", regs
, error_code
, NULL
);
477 preempt_conditional_cli(regs
);
482 * Help handler running on IST stack to switch back to user stack
483 * for scheduling or signal handling. The actual stack switch is done in
486 asmlinkage __kprobes
struct pt_regs
*sync_regs(struct pt_regs
*eregs
)
488 struct pt_regs
*regs
= eregs
;
489 /* Did already sync */
490 if (eregs
== (struct pt_regs
*)eregs
->sp
)
492 /* Exception from user space */
493 else if (user_mode(eregs
))
494 regs
= task_pt_regs(current
);
496 * Exception from kernel and interrupts are enabled. Move to
497 * kernel process stack.
499 else if (eregs
->flags
& X86_EFLAGS_IF
)
500 regs
= (struct pt_regs
*)(eregs
->sp
-= sizeof(struct pt_regs
));
508 * Our handling of the processor debug registers is non-trivial.
509 * We do not clear them on entry and exit from the kernel. Therefore
510 * it is possible to get a watchpoint trap here from inside the kernel.
511 * However, the code in ./ptrace.c has ensured that the user can
512 * only set watchpoints on userspace addresses. Therefore the in-kernel
513 * watchpoint trap can only occur in code which is reading/writing
514 * from user space. Such code must not hold kernel locks (since it
515 * can equally take a page fault), therefore it is safe to call
516 * force_sig_info even though that claims and releases locks.
518 * Code in ./signal.c ensures that the debug control register
519 * is restored before we deliver any signal, and therefore that
520 * user code runs with the correct debug control register even though
523 * Being careful here means that we don't have to be as careful in a
524 * lot of more complicated places (task switching can be a bit lazy
525 * about restoring all the debug state, and ptrace doesn't have to
526 * find every occurrence of the TF bit that could be saved away even
529 * May run on IST stack.
531 dotraplinkage
void __kprobes
do_debug(struct pt_regs
*regs
, long error_code
)
533 struct task_struct
*tsk
= current
;
534 unsigned long condition
;
537 get_debugreg(condition
, 6);
539 /* Catch kmemcheck conditions first of all! */
540 if (condition
& DR_STEP
&& kmemcheck_trap(regs
))
544 * The processor cleared BTF, so don't mark that we need it set.
546 clear_tsk_thread_flag(tsk
, TIF_DEBUGCTLMSR
);
547 tsk
->thread
.debugctlmsr
= 0;
549 if (notify_die(DIE_DEBUG
, "debug", regs
, condition
, error_code
,
550 SIGTRAP
) == NOTIFY_STOP
)
553 /* It's safe to allow irq's after DR6 has been saved */
554 preempt_conditional_sti(regs
);
556 /* Mask out spurious debug traps due to lazy DR7 setting */
557 if (condition
& (DR_TRAP0
|DR_TRAP1
|DR_TRAP2
|DR_TRAP3
)) {
558 if (!tsk
->thread
.debugreg7
)
563 if (regs
->flags
& X86_VM_MASK
)
567 /* Save debug status register where ptrace can see it */
568 tsk
->thread
.debugreg6
= condition
;
571 * Single-stepping through TF: make sure we ignore any events in
572 * kernel space (but re-enable TF when returning to user mode).
574 if (condition
& DR_STEP
) {
575 if (!user_mode(regs
))
576 goto clear_TF_reenable
;
579 si_code
= get_si_code(condition
);
580 /* Ok, finally something we can handle */
581 send_sigtrap(tsk
, regs
, error_code
, si_code
);
584 * Disable additional traps. They'll be re-enabled when
585 * the signal is delivered.
589 preempt_conditional_cli(regs
);
594 /* reenable preemption: handle_vm86_trap() might sleep */
596 handle_vm86_trap((struct kernel_vm86_regs
*) regs
, error_code
, 1);
597 conditional_cli(regs
);
602 set_tsk_thread_flag(tsk
, TIF_SINGLESTEP
);
603 regs
->flags
&= ~X86_EFLAGS_TF
;
604 preempt_conditional_cli(regs
);
609 static int kernel_math_error(struct pt_regs
*regs
, const char *str
, int trapnr
)
611 if (fixup_exception(regs
))
614 notify_die(DIE_GPF
, str
, regs
, 0, trapnr
, SIGFPE
);
615 /* Illegal floating point operation in the kernel */
616 current
->thread
.trap_no
= trapnr
;
623 * Note that we play around with the 'TS' bit in an attempt to get
624 * the correct behaviour even in the presence of the asynchronous
627 void math_error(void __user
*ip
)
629 struct task_struct
*task
;
631 unsigned short cwd
, swd
, err
;
634 * Save the info for the exception handler and clear the error.
638 task
->thread
.trap_no
= 16;
639 task
->thread
.error_code
= 0;
640 info
.si_signo
= SIGFPE
;
644 * (~cwd & swd) will mask out exceptions that are not set to unmasked
645 * status. 0x3f is the exception bits in these regs, 0x200 is the
646 * C1 reg you need in case of a stack fault, 0x040 is the stack
647 * fault bit. We should only be taking one exception at a time,
648 * so if this combination doesn't produce any single exception,
649 * then we have a bad program that isn't synchronizing its FPU usage
650 * and it will suffer the consequences since we won't be able to
651 * fully reproduce the context of the exception
653 cwd
= get_fpu_cwd(task
);
654 swd
= get_fpu_swd(task
);
658 if (err
& 0x001) { /* Invalid op */
660 * swd & 0x240 == 0x040: Stack Underflow
661 * swd & 0x240 == 0x240: Stack Overflow
662 * User must clear the SF bit (0x40) if set
664 info
.si_code
= FPE_FLTINV
;
665 } else if (err
& 0x004) { /* Divide by Zero */
666 info
.si_code
= FPE_FLTDIV
;
667 } else if (err
& 0x008) { /* Overflow */
668 info
.si_code
= FPE_FLTOVF
;
669 } else if (err
& 0x012) { /* Denormal, Underflow */
670 info
.si_code
= FPE_FLTUND
;
671 } else if (err
& 0x020) { /* Precision */
672 info
.si_code
= FPE_FLTRES
;
675 * If we're using IRQ 13, or supposedly even some trap 16
676 * implementations, it's possible we get a spurious trap...
678 return; /* Spurious trap, no error */
680 force_sig_info(SIGFPE
, &info
, task
);
683 dotraplinkage
void do_coprocessor_error(struct pt_regs
*regs
, long error_code
)
685 conditional_sti(regs
);
690 if (!user_mode(regs
) &&
691 kernel_math_error(regs
, "kernel x87 math error", 16))
695 math_error((void __user
*)regs
->ip
);
698 static void simd_math_error(void __user
*ip
)
700 struct task_struct
*task
;
702 unsigned short mxcsr
;
705 * Save the info for the exception handler and clear the error.
709 task
->thread
.trap_no
= 19;
710 task
->thread
.error_code
= 0;
711 info
.si_signo
= SIGFPE
;
713 info
.si_code
= __SI_FAULT
;
716 * The SIMD FPU exceptions are handled a little differently, as there
717 * is only a single status/control register. Thus, to determine which
718 * unmasked exception was caught we must mask the exception mask bits
719 * at 0x1f80, and then use these to mask the exception bits at 0x3f.
721 mxcsr
= get_fpu_mxcsr(task
);
722 switch (~((mxcsr
& 0x1f80) >> 7) & (mxcsr
& 0x3f)) {
726 case 0x001: /* Invalid Op */
727 info
.si_code
= FPE_FLTINV
;
729 case 0x002: /* Denormalize */
730 case 0x010: /* Underflow */
731 info
.si_code
= FPE_FLTUND
;
733 case 0x004: /* Zero Divide */
734 info
.si_code
= FPE_FLTDIV
;
736 case 0x008: /* Overflow */
737 info
.si_code
= FPE_FLTOVF
;
739 case 0x020: /* Precision */
740 info
.si_code
= FPE_FLTRES
;
743 force_sig_info(SIGFPE
, &info
, task
);
747 do_simd_coprocessor_error(struct pt_regs
*regs
, long error_code
)
749 conditional_sti(regs
);
753 /* Handle SIMD FPU exceptions on PIII+ processors. */
755 simd_math_error((void __user
*)regs
->ip
);
759 * Handle strange cache flush from user space exception
760 * in all other cases. This is undocumented behaviour.
762 if (regs
->flags
& X86_VM_MASK
) {
763 handle_vm86_fault((struct kernel_vm86_regs
*)regs
, error_code
);
766 current
->thread
.trap_no
= 19;
767 current
->thread
.error_code
= error_code
;
768 die_if_kernel("cache flush denied", regs
, error_code
);
769 force_sig(SIGSEGV
, current
);
771 if (!user_mode(regs
) &&
772 kernel_math_error(regs
, "kernel simd math error", 19))
774 simd_math_error((void __user
*)regs
->ip
);
779 do_spurious_interrupt_bug(struct pt_regs
*regs
, long error_code
)
781 conditional_sti(regs
);
783 /* No need to warn about this any longer. */
784 printk(KERN_INFO
"Ignoring P6 Local APIC Spurious Interrupt Bug...\n");
788 asmlinkage
void __attribute__((weak
)) smp_thermal_interrupt(void)
792 asmlinkage
void __attribute__((weak
)) smp_threshold_interrupt(void)
797 * __math_state_restore assumes that cr0.TS is already clear and the
798 * fpu state is all ready for use. Used during context switch.
800 void __math_state_restore(void)
802 struct thread_info
*thread
= current_thread_info();
803 struct task_struct
*tsk
= thread
->task
;
806 * Paranoid restore. send a SIGSEGV if we fail to restore the state.
808 if (unlikely(restore_fpu_checking(tsk
))) {
810 force_sig(SIGSEGV
, tsk
);
814 thread
->status
|= TS_USEDFPU
; /* So we fnsave on switch_to() */
819 * 'math_state_restore()' saves the current math information in the
820 * old math state array, and gets the new ones from the current task
822 * Careful.. There are problems with IBM-designed IRQ13 behaviour.
823 * Don't touch unless you *really* know how it works.
825 * Must be called with kernel preemption disabled (in this case,
826 * local interrupts are disabled at the call-site in entry.S).
828 asmlinkage
void math_state_restore(void)
830 struct thread_info
*thread
= current_thread_info();
831 struct task_struct
*tsk
= thread
->task
;
833 if (!tsk_used_math(tsk
)) {
836 * does a slab alloc which can sleep
842 do_group_exit(SIGKILL
);
848 clts(); /* Allow maths ops (or we recurse) */
850 __math_state_restore();
852 EXPORT_SYMBOL_GPL(math_state_restore
);
854 #ifndef CONFIG_MATH_EMULATION
855 void math_emulate(struct math_emu_info
*info
)
858 "math-emulation not enabled and no coprocessor found.\n");
859 printk(KERN_EMERG
"killing %s.\n", current
->comm
);
860 force_sig(SIGFPE
, current
);
863 #endif /* CONFIG_MATH_EMULATION */
865 dotraplinkage
void __kprobes
866 do_device_not_available(struct pt_regs
*regs
, long error_code
)
869 if (read_cr0() & X86_CR0_EM
) {
870 struct math_emu_info info
= { };
872 conditional_sti(regs
);
877 math_state_restore(); /* interrupts still off */
878 conditional_sti(regs
);
881 math_state_restore();
886 dotraplinkage
void do_iret_error(struct pt_regs
*regs
, long error_code
)
891 info
.si_signo
= SIGILL
;
893 info
.si_code
= ILL_BADSTK
;
895 if (notify_die(DIE_TRAP
, "iret exception",
896 regs
, error_code
, 32, SIGILL
) == NOTIFY_STOP
)
898 do_trap(32, SIGILL
, "iret exception", regs
, error_code
, &info
);
902 void __init
trap_init(void)
907 void __iomem
*p
= early_ioremap(0x0FFFD9, 4);
909 if (readl(p
) == 'E' + ('I'<<8) + ('S'<<16) + ('A'<<24))
914 set_intr_gate(0, ÷_error
);
915 set_intr_gate_ist(1, &debug
, DEBUG_STACK
);
916 set_intr_gate_ist(2, &nmi
, NMI_STACK
);
917 /* int3 can be called from all */
918 set_system_intr_gate_ist(3, &int3
, DEBUG_STACK
);
919 /* int4 can be called from all */
920 set_system_intr_gate(4, &overflow
);
921 set_intr_gate(5, &bounds
);
922 set_intr_gate(6, &invalid_op
);
923 set_intr_gate(7, &device_not_available
);
925 set_task_gate(8, GDT_ENTRY_DOUBLEFAULT_TSS
);
927 set_intr_gate_ist(8, &double_fault
, DOUBLEFAULT_STACK
);
929 set_intr_gate(9, &coprocessor_segment_overrun
);
930 set_intr_gate(10, &invalid_TSS
);
931 set_intr_gate(11, &segment_not_present
);
932 set_intr_gate_ist(12, &stack_segment
, STACKFAULT_STACK
);
933 set_intr_gate(13, &general_protection
);
934 set_intr_gate(14, &page_fault
);
935 set_intr_gate(15, &spurious_interrupt_bug
);
936 set_intr_gate(16, &coprocessor_error
);
937 set_intr_gate(17, &alignment_check
);
938 #ifdef CONFIG_X86_MCE
939 set_intr_gate_ist(18, &machine_check
, MCE_STACK
);
941 set_intr_gate(19, &simd_coprocessor_error
);
943 /* Reserve all the builtin and the syscall vector: */
944 for (i
= 0; i
< FIRST_EXTERNAL_VECTOR
; i
++)
945 set_bit(i
, used_vectors
);
947 #ifdef CONFIG_IA32_EMULATION
948 set_system_intr_gate(IA32_SYSCALL_VECTOR
, ia32_syscall
);
949 set_bit(IA32_SYSCALL_VECTOR
, used_vectors
);
954 printk(KERN_INFO
"Enabling fast FPU save and restore... ");
955 set_in_cr4(X86_CR4_OSFXSR
);
960 "Enabling unmasked SIMD FPU exception support... ");
961 set_in_cr4(X86_CR4_OSXMMEXCPT
);
965 set_system_trap_gate(SYSCALL_VECTOR
, &system_call
);
966 set_bit(SYSCALL_VECTOR
, used_vectors
);
970 * Should be a barrier for any external CPU state:
974 x86_init
.irqs
.trap_init();