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/delay.h>
24 #include <linux/errno.h>
25 #include <linux/kexec.h>
26 #include <linux/sched.h>
27 #include <linux/timer.h>
28 #include <linux/init.h>
29 #include <linux/bug.h>
30 #include <linux/nmi.h>
32 #include <linux/smp.h>
36 #include <linux/ioport.h>
37 #include <linux/eisa.h>
41 #include <linux/mca.h>
44 #if defined(CONFIG_EDAC)
45 #include <linux/edac.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>
57 #include <asm/mach_traps.h>
60 #include <asm/pgalloc.h>
61 #include <asm/proto.h>
63 #include <asm/processor-flags.h>
64 #include <asm/setup.h>
65 #include <asm/traps.h>
67 #include "cpu/mcheck/mce.h"
69 asmlinkage
int system_call(void);
71 /* Do we ignore FPU interrupts ? */
75 * The IDT has to be page-aligned to simplify the Pentium
76 * F0 0F bug workaround.. We have a special link segment
79 gate_desc idt_table
[256]
80 __attribute__((__section__(".data.idt"))) = { { { { 0, 0 } } }, };
83 DECLARE_BITMAP(used_vectors
, NR_VECTORS
);
84 EXPORT_SYMBOL_GPL(used_vectors
);
86 static int ignore_nmis
;
88 static inline void conditional_sti(struct pt_regs
*regs
)
90 if (regs
->flags
& X86_EFLAGS_IF
)
94 static inline void preempt_conditional_sti(struct pt_regs
*regs
)
97 if (regs
->flags
& X86_EFLAGS_IF
)
101 static inline void conditional_cli(struct pt_regs
*regs
)
103 if (regs
->flags
& X86_EFLAGS_IF
)
107 static inline void preempt_conditional_cli(struct pt_regs
*regs
)
109 if (regs
->flags
& X86_EFLAGS_IF
)
116 die_if_kernel(const char *str
, struct pt_regs
*regs
, long err
)
118 if (!user_mode_vm(regs
))
123 static void __kprobes
124 do_trap(int trapnr
, int signr
, char *str
, struct pt_regs
*regs
,
125 long error_code
, siginfo_t
*info
)
127 struct task_struct
*tsk
= current
;
130 if (regs
->flags
& X86_VM_MASK
) {
132 * traps 0, 1, 3, 4, and 5 should be forwarded to vm86.
133 * On nmi (interrupt 2), do_trap should not be called.
141 if (!user_mode(regs
))
148 * We want error_code and trap_no set for userspace faults and
149 * kernelspace faults which result in die(), but not
150 * kernelspace faults which are fixed up. die() gives the
151 * process no chance to handle the signal and notice the
152 * kernel fault information, so that won't result in polluting
153 * the information about previously queued, but not yet
154 * delivered, faults. See also do_general_protection below.
156 tsk
->thread
.error_code
= error_code
;
157 tsk
->thread
.trap_no
= trapnr
;
160 if (show_unhandled_signals
&& unhandled_signal(tsk
, signr
) &&
161 printk_ratelimit()) {
163 "%s[%d] trap %s ip:%lx sp:%lx error:%lx",
164 tsk
->comm
, tsk
->pid
, str
,
165 regs
->ip
, regs
->sp
, error_code
);
166 print_vma_addr(" in ", regs
->ip
);
172 force_sig_info(signr
, info
, tsk
);
174 force_sig(signr
, tsk
);
178 if (!fixup_exception(regs
)) {
179 tsk
->thread
.error_code
= error_code
;
180 tsk
->thread
.trap_no
= trapnr
;
181 die(str
, regs
, error_code
);
187 if (handle_vm86_trap((struct kernel_vm86_regs
*) regs
,
194 #define DO_ERROR(trapnr, signr, str, name) \
195 dotraplinkage void do_##name(struct pt_regs *regs, long error_code) \
197 if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \
200 conditional_sti(regs); \
201 do_trap(trapnr, signr, str, regs, error_code, NULL); \
204 #define DO_ERROR_INFO(trapnr, signr, str, name, sicode, siaddr) \
205 dotraplinkage void do_##name(struct pt_regs *regs, long error_code) \
208 info.si_signo = signr; \
210 info.si_code = sicode; \
211 info.si_addr = (void __user *)siaddr; \
212 if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \
215 conditional_sti(regs); \
216 do_trap(trapnr, signr, str, regs, error_code, &info); \
219 DO_ERROR_INFO(0, SIGFPE
, "divide error", divide_error
, FPE_INTDIV
, regs
->ip
)
220 DO_ERROR(4, SIGSEGV
, "overflow", overflow
)
221 DO_ERROR(5, SIGSEGV
, "bounds", bounds
)
222 DO_ERROR_INFO(6, SIGILL
, "invalid opcode", invalid_op
, ILL_ILLOPN
, regs
->ip
)
223 DO_ERROR(9, SIGFPE
, "coprocessor segment overrun", coprocessor_segment_overrun
)
224 DO_ERROR(10, SIGSEGV
, "invalid TSS", invalid_TSS
)
225 DO_ERROR(11, SIGBUS
, "segment not present", segment_not_present
)
227 DO_ERROR(12, SIGBUS
, "stack segment", stack_segment
)
229 DO_ERROR_INFO(17, SIGBUS
, "alignment check", alignment_check
, BUS_ADRALN
, 0)
232 /* Runs on IST stack */
233 dotraplinkage
void do_stack_segment(struct pt_regs
*regs
, long error_code
)
235 if (notify_die(DIE_TRAP
, "stack segment", regs
, error_code
,
236 12, SIGBUS
) == NOTIFY_STOP
)
238 preempt_conditional_sti(regs
);
239 do_trap(12, SIGBUS
, "stack segment", regs
, error_code
, NULL
);
240 preempt_conditional_cli(regs
);
243 dotraplinkage
void do_double_fault(struct pt_regs
*regs
, long error_code
)
245 static const char str
[] = "double fault";
246 struct task_struct
*tsk
= current
;
248 /* Return not checked because double check cannot be ignored */
249 notify_die(DIE_TRAP
, str
, regs
, error_code
, 8, SIGSEGV
);
251 tsk
->thread
.error_code
= error_code
;
252 tsk
->thread
.trap_no
= 8;
255 * This is always a kernel trap and never fixable (and thus must
259 die(str
, regs
, error_code
);
263 dotraplinkage
void __kprobes
264 do_general_protection(struct pt_regs
*regs
, long error_code
)
266 struct task_struct
*tsk
;
268 conditional_sti(regs
);
271 if (regs
->flags
& X86_VM_MASK
)
276 if (!user_mode(regs
))
279 tsk
->thread
.error_code
= error_code
;
280 tsk
->thread
.trap_no
= 13;
282 if (show_unhandled_signals
&& unhandled_signal(tsk
, SIGSEGV
) &&
283 printk_ratelimit()) {
285 "%s[%d] general protection ip:%lx sp:%lx error:%lx",
286 tsk
->comm
, task_pid_nr(tsk
),
287 regs
->ip
, regs
->sp
, error_code
);
288 print_vma_addr(" in ", regs
->ip
);
292 force_sig(SIGSEGV
, tsk
);
298 handle_vm86_fault((struct kernel_vm86_regs
*) regs
, error_code
);
303 if (fixup_exception(regs
))
306 tsk
->thread
.error_code
= error_code
;
307 tsk
->thread
.trap_no
= 13;
308 if (notify_die(DIE_GPF
, "general protection fault", regs
,
309 error_code
, 13, SIGSEGV
) == NOTIFY_STOP
)
311 die("general protection fault", regs
, error_code
);
314 static notrace __kprobes
void
315 mem_parity_error(unsigned char reason
, struct pt_regs
*regs
)
318 "Uhhuh. NMI received for unknown reason %02x on CPU %d.\n",
319 reason
, smp_processor_id());
322 "You have some hardware problem, likely on the PCI bus.\n");
324 #if defined(CONFIG_EDAC)
325 if (edac_handler_set()) {
326 edac_atomic_assert_error();
331 if (panic_on_unrecovered_nmi
)
332 panic("NMI: Not continuing");
334 printk(KERN_EMERG
"Dazed and confused, but trying to continue\n");
336 /* Clear and disable the memory parity error line. */
337 reason
= (reason
& 0xf) | 4;
341 static notrace __kprobes
void
342 io_check_error(unsigned char reason
, struct pt_regs
*regs
)
346 printk(KERN_EMERG
"NMI: IOCK error (debug interrupt?)\n");
347 show_registers(regs
);
349 /* Re-enable the IOCK line, wait for a few seconds */
350 reason
= (reason
& 0xf) | 8;
361 static notrace __kprobes
void
362 unknown_nmi_error(unsigned char reason
, struct pt_regs
*regs
)
364 if (notify_die(DIE_NMIUNKNOWN
, "nmi", regs
, reason
, 2, SIGINT
) ==
369 * Might actually be able to figure out what the guilty party
378 "Uhhuh. NMI received for unknown reason %02x on CPU %d.\n",
379 reason
, smp_processor_id());
381 printk(KERN_EMERG
"Do you have a strange power saving mode enabled?\n");
382 if (panic_on_unrecovered_nmi
)
383 panic("NMI: Not continuing");
385 printk(KERN_EMERG
"Dazed and confused, but trying to continue\n");
388 static notrace __kprobes
void default_do_nmi(struct pt_regs
*regs
)
390 unsigned char reason
= 0;
393 cpu
= smp_processor_id();
395 /* Only the BSP gets external NMIs from the system. */
397 reason
= get_nmi_reason();
399 if (!(reason
& 0xc0)) {
400 if (notify_die(DIE_NMI_IPI
, "nmi_ipi", regs
, reason
, 2, SIGINT
)
403 #ifdef CONFIG_X86_LOCAL_APIC
405 * Ok, so this is none of the documented NMI sources,
406 * so it must be the NMI watchdog.
408 if (nmi_watchdog_tick(regs
, reason
))
410 if (!do_nmi_callback(regs
, cpu
))
411 unknown_nmi_error(reason
, regs
);
413 unknown_nmi_error(reason
, regs
);
418 if (notify_die(DIE_NMI
, "nmi", regs
, reason
, 2, SIGINT
) == NOTIFY_STOP
)
421 /* AK: following checks seem to be broken on modern chipsets. FIXME */
423 mem_parity_error(reason
, regs
);
425 io_check_error(reason
, regs
);
428 * Reassert NMI in case it became active meanwhile
429 * as it's edge-triggered:
435 dotraplinkage notrace __kprobes
void
436 do_nmi(struct pt_regs
*regs
, long error_code
)
440 inc_irq_stat(__nmi_count
);
443 default_do_nmi(regs
);
454 void restart_nmi(void)
460 /* May run on IST stack. */
461 dotraplinkage
void __kprobes
do_int3(struct pt_regs
*regs
, long error_code
)
463 #ifdef CONFIG_KPROBES
464 if (notify_die(DIE_INT3
, "int3", regs
, error_code
, 3, SIGTRAP
)
468 if (notify_die(DIE_TRAP
, "int3", regs
, error_code
, 3, SIGTRAP
)
473 preempt_conditional_sti(regs
);
474 do_trap(3, SIGTRAP
, "int3", regs
, error_code
, NULL
);
475 preempt_conditional_cli(regs
);
480 * Help handler running on IST stack to switch back to user stack
481 * for scheduling or signal handling. The actual stack switch is done in
484 asmlinkage __kprobes
struct pt_regs
*sync_regs(struct pt_regs
*eregs
)
486 struct pt_regs
*regs
= eregs
;
487 /* Did already sync */
488 if (eregs
== (struct pt_regs
*)eregs
->sp
)
490 /* Exception from user space */
491 else if (user_mode(eregs
))
492 regs
= task_pt_regs(current
);
494 * Exception from kernel and interrupts are enabled. Move to
495 * kernel process stack.
497 else if (eregs
->flags
& X86_EFLAGS_IF
)
498 regs
= (struct pt_regs
*)(eregs
->sp
-= sizeof(struct pt_regs
));
506 * Our handling of the processor debug registers is non-trivial.
507 * We do not clear them on entry and exit from the kernel. Therefore
508 * it is possible to get a watchpoint trap here from inside the kernel.
509 * However, the code in ./ptrace.c has ensured that the user can
510 * only set watchpoints on userspace addresses. Therefore the in-kernel
511 * watchpoint trap can only occur in code which is reading/writing
512 * from user space. Such code must not hold kernel locks (since it
513 * can equally take a page fault), therefore it is safe to call
514 * force_sig_info even though that claims and releases locks.
516 * Code in ./signal.c ensures that the debug control register
517 * is restored before we deliver any signal, and therefore that
518 * user code runs with the correct debug control register even though
521 * Being careful here means that we don't have to be as careful in a
522 * lot of more complicated places (task switching can be a bit lazy
523 * about restoring all the debug state, and ptrace doesn't have to
524 * find every occurrence of the TF bit that could be saved away even
527 * May run on IST stack.
529 dotraplinkage
void __kprobes
do_debug(struct pt_regs
*regs
, long error_code
)
531 struct task_struct
*tsk
= current
;
535 get_debugreg(dr6
, 6);
537 /* DR6 may or may not be cleared by the CPU */
540 * The processor cleared BTF, so don't mark that we need it set.
542 clear_tsk_thread_flag(tsk
, TIF_DEBUGCTLMSR
);
543 tsk
->thread
.debugctlmsr
= 0;
545 /* Store the virtualized DR6 value */
546 tsk
->thread
.debugreg6
= dr6
;
548 if (notify_die(DIE_DEBUG
, "debug", regs
, PTR_ERR(&dr6
), error_code
,
549 SIGTRAP
) == NOTIFY_STOP
)
552 /* It's safe to allow irq's after DR6 has been saved */
553 preempt_conditional_sti(regs
);
555 if (regs
->flags
& X86_VM_MASK
) {
556 handle_vm86_trap((struct kernel_vm86_regs
*) regs
,
562 * Single-stepping through system calls: ignore any exceptions in
563 * kernel space, but re-enable TF when returning to user mode.
565 * We already checked v86 mode above, so we can check for kernel mode
566 * by just checking the CPL of CS.
568 if ((dr6
& DR_STEP
) && !user_mode(regs
)) {
569 tsk
->thread
.debugreg6
&= ~DR_STEP
;
570 set_tsk_thread_flag(tsk
, TIF_SINGLESTEP
);
571 regs
->flags
&= ~X86_EFLAGS_TF
;
573 si_code
= get_si_code(tsk
->thread
.debugreg6
);
574 if (tsk
->thread
.debugreg6
& (DR_STEP
| DR_TRAP_BITS
))
575 send_sigtrap(tsk
, regs
, error_code
, si_code
);
576 preempt_conditional_cli(regs
);
582 static int kernel_math_error(struct pt_regs
*regs
, const char *str
, int trapnr
)
584 if (fixup_exception(regs
))
587 notify_die(DIE_GPF
, str
, regs
, 0, trapnr
, SIGFPE
);
588 /* Illegal floating point operation in the kernel */
589 current
->thread
.trap_no
= trapnr
;
596 * Note that we play around with the 'TS' bit in an attempt to get
597 * the correct behaviour even in the presence of the asynchronous
600 void math_error(void __user
*ip
)
602 struct task_struct
*task
;
604 unsigned short cwd
, swd
, err
;
607 * Save the info for the exception handler and clear the error.
611 task
->thread
.trap_no
= 16;
612 task
->thread
.error_code
= 0;
613 info
.si_signo
= SIGFPE
;
617 * (~cwd & swd) will mask out exceptions that are not set to unmasked
618 * status. 0x3f is the exception bits in these regs, 0x200 is the
619 * C1 reg you need in case of a stack fault, 0x040 is the stack
620 * fault bit. We should only be taking one exception at a time,
621 * so if this combination doesn't produce any single exception,
622 * then we have a bad program that isn't synchronizing its FPU usage
623 * and it will suffer the consequences since we won't be able to
624 * fully reproduce the context of the exception
626 cwd
= get_fpu_cwd(task
);
627 swd
= get_fpu_swd(task
);
631 if (err
& 0x001) { /* Invalid op */
633 * swd & 0x240 == 0x040: Stack Underflow
634 * swd & 0x240 == 0x240: Stack Overflow
635 * User must clear the SF bit (0x40) if set
637 info
.si_code
= FPE_FLTINV
;
638 } else if (err
& 0x004) { /* Divide by Zero */
639 info
.si_code
= FPE_FLTDIV
;
640 } else if (err
& 0x008) { /* Overflow */
641 info
.si_code
= FPE_FLTOVF
;
642 } else if (err
& 0x012) { /* Denormal, Underflow */
643 info
.si_code
= FPE_FLTUND
;
644 } else if (err
& 0x020) { /* Precision */
645 info
.si_code
= FPE_FLTRES
;
648 * If we're using IRQ 13, or supposedly even some trap 16
649 * implementations, it's possible we get a spurious trap...
651 return; /* Spurious trap, no error */
653 force_sig_info(SIGFPE
, &info
, task
);
656 dotraplinkage
void do_coprocessor_error(struct pt_regs
*regs
, long error_code
)
658 conditional_sti(regs
);
663 if (!user_mode(regs
) &&
664 kernel_math_error(regs
, "kernel x87 math error", 16))
668 math_error((void __user
*)regs
->ip
);
671 static void simd_math_error(void __user
*ip
)
673 struct task_struct
*task
;
675 unsigned short mxcsr
;
678 * Save the info for the exception handler and clear the error.
682 task
->thread
.trap_no
= 19;
683 task
->thread
.error_code
= 0;
684 info
.si_signo
= SIGFPE
;
686 info
.si_code
= __SI_FAULT
;
689 * The SIMD FPU exceptions are handled a little differently, as there
690 * is only a single status/control register. Thus, to determine which
691 * unmasked exception was caught we must mask the exception mask bits
692 * at 0x1f80, and then use these to mask the exception bits at 0x3f.
694 mxcsr
= get_fpu_mxcsr(task
);
695 switch (~((mxcsr
& 0x1f80) >> 7) & (mxcsr
& 0x3f)) {
699 case 0x001: /* Invalid Op */
700 info
.si_code
= FPE_FLTINV
;
702 case 0x002: /* Denormalize */
703 case 0x010: /* Underflow */
704 info
.si_code
= FPE_FLTUND
;
706 case 0x004: /* Zero Divide */
707 info
.si_code
= FPE_FLTDIV
;
709 case 0x008: /* Overflow */
710 info
.si_code
= FPE_FLTOVF
;
712 case 0x020: /* Precision */
713 info
.si_code
= FPE_FLTRES
;
716 force_sig_info(SIGFPE
, &info
, task
);
720 do_simd_coprocessor_error(struct pt_regs
*regs
, long error_code
)
722 conditional_sti(regs
);
726 /* Handle SIMD FPU exceptions on PIII+ processors. */
728 simd_math_error((void __user
*)regs
->ip
);
732 * Handle strange cache flush from user space exception
733 * in all other cases. This is undocumented behaviour.
735 if (regs
->flags
& X86_VM_MASK
) {
736 handle_vm86_fault((struct kernel_vm86_regs
*)regs
, error_code
);
739 current
->thread
.trap_no
= 19;
740 current
->thread
.error_code
= error_code
;
741 die_if_kernel("cache flush denied", regs
, error_code
);
742 force_sig(SIGSEGV
, current
);
744 if (!user_mode(regs
) &&
745 kernel_math_error(regs
, "kernel simd math error", 19))
747 simd_math_error((void __user
*)regs
->ip
);
752 do_spurious_interrupt_bug(struct pt_regs
*regs
, long error_code
)
754 conditional_sti(regs
);
756 /* No need to warn about this any longer. */
757 printk(KERN_INFO
"Ignoring P6 Local APIC Spurious Interrupt Bug...\n");
762 unsigned long patch_espfix_desc(unsigned long uesp
, unsigned long kesp
)
764 struct desc_struct
*gdt
= get_cpu_gdt_table(smp_processor_id());
765 unsigned long base
= (kesp
- uesp
) & -THREAD_SIZE
;
766 unsigned long new_kesp
= kesp
- base
;
767 unsigned long lim_pages
= (new_kesp
| (THREAD_SIZE
- 1)) >> PAGE_SHIFT
;
768 __u64 desc
= *(__u64
*)&gdt
[GDT_ENTRY_ESPFIX_SS
];
770 /* Set up base for espfix segment */
771 desc
&= 0x00f0ff0000000000ULL
;
772 desc
|= ((((__u64
)base
) << 16) & 0x000000ffffff0000ULL
) |
773 ((((__u64
)base
) << 32) & 0xff00000000000000ULL
) |
774 ((((__u64
)lim_pages
) << 32) & 0x000f000000000000ULL
) |
775 (lim_pages
& 0xffff);
776 *(__u64
*)&gdt
[GDT_ENTRY_ESPFIX_SS
] = desc
;
781 asmlinkage
void __attribute__((weak
)) smp_thermal_interrupt(void)
785 asmlinkage
void __attribute__((weak
)) mce_threshold_interrupt(void)
791 * 'math_state_restore()' saves the current math information in the
792 * old math state array, and gets the new ones from the current task
794 * Careful.. There are problems with IBM-designed IRQ13 behaviour.
795 * Don't touch unless you *really* know how it works.
797 * Must be called with kernel preemption disabled (in this case,
798 * local interrupts are disabled at the call-site in entry.S).
800 asmlinkage
void math_state_restore(void)
802 struct thread_info
*thread
= current_thread_info();
803 struct task_struct
*tsk
= thread
->task
;
805 if (!tsk_used_math(tsk
)) {
808 * does a slab alloc which can sleep
814 do_group_exit(SIGKILL
);
820 clts(); /* Allow maths ops (or we recurse) */
825 * Paranoid restore. send a SIGSEGV if we fail to restore the state.
827 if (unlikely(restore_fpu_checking(tsk
))) {
829 force_sig(SIGSEGV
, tsk
);
833 thread
->status
|= TS_USEDFPU
; /* So we fnsave on switch_to() */
836 EXPORT_SYMBOL_GPL(math_state_restore
);
838 #ifndef CONFIG_MATH_EMULATION
839 void math_emulate(struct math_emu_info
*info
)
842 "math-emulation not enabled and no coprocessor found.\n");
843 printk(KERN_EMERG
"killing %s.\n", current
->comm
);
844 force_sig(SIGFPE
, current
);
847 #endif /* CONFIG_MATH_EMULATION */
849 dotraplinkage
void __kprobes
850 do_device_not_available(struct pt_regs
*regs
, long error_code
)
853 if (read_cr0() & X86_CR0_EM
) {
854 struct math_emu_info info
= { };
856 conditional_sti(regs
);
861 math_state_restore(); /* interrupts still off */
862 conditional_sti(regs
);
865 math_state_restore();
870 dotraplinkage
void do_iret_error(struct pt_regs
*regs
, long error_code
)
875 info
.si_signo
= SIGILL
;
877 info
.si_code
= ILL_BADSTK
;
879 if (notify_die(DIE_TRAP
, "iret exception",
880 regs
, error_code
, 32, SIGILL
) == NOTIFY_STOP
)
882 do_trap(32, SIGILL
, "iret exception", regs
, error_code
, &info
);
886 void __init
trap_init(void)
891 void __iomem
*p
= early_ioremap(0x0FFFD9, 4);
893 if (readl(p
) == 'E' + ('I'<<8) + ('S'<<16) + ('A'<<24))
898 set_intr_gate(0, ÷_error
);
899 set_intr_gate_ist(1, &debug
, DEBUG_STACK
);
900 set_intr_gate_ist(2, &nmi
, NMI_STACK
);
901 /* int3 can be called from all */
902 set_system_intr_gate_ist(3, &int3
, DEBUG_STACK
);
903 /* int4 can be called from all */
904 set_system_intr_gate(4, &overflow
);
905 set_intr_gate(5, &bounds
);
906 set_intr_gate(6, &invalid_op
);
907 set_intr_gate(7, &device_not_available
);
909 set_task_gate(8, GDT_ENTRY_DOUBLEFAULT_TSS
);
911 set_intr_gate_ist(8, &double_fault
, DOUBLEFAULT_STACK
);
913 set_intr_gate(9, &coprocessor_segment_overrun
);
914 set_intr_gate(10, &invalid_TSS
);
915 set_intr_gate(11, &segment_not_present
);
916 set_intr_gate_ist(12, &stack_segment
, STACKFAULT_STACK
);
917 set_intr_gate(13, &general_protection
);
918 set_intr_gate(14, &page_fault
);
919 set_intr_gate(15, &spurious_interrupt_bug
);
920 set_intr_gate(16, &coprocessor_error
);
921 set_intr_gate(17, &alignment_check
);
922 #ifdef CONFIG_X86_MCE
923 set_intr_gate_ist(18, &machine_check
, MCE_STACK
);
925 set_intr_gate(19, &simd_coprocessor_error
);
927 #ifdef CONFIG_IA32_EMULATION
928 set_system_intr_gate(IA32_SYSCALL_VECTOR
, ia32_syscall
);
933 printk(KERN_INFO
"Enabling fast FPU save and restore... ");
934 set_in_cr4(X86_CR4_OSFXSR
);
939 "Enabling unmasked SIMD FPU exception support... ");
940 set_in_cr4(X86_CR4_OSXMMEXCPT
);
944 set_system_trap_gate(SYSCALL_VECTOR
, &system_call
);
947 /* Reserve all the builtin and the syscall vector: */
948 for (i
= 0; i
< FIRST_EXTERNAL_VECTOR
; i
++)
949 set_bit(i
, used_vectors
);
952 set_bit(IA32_SYSCALL_VECTOR
, used_vectors
);
954 set_bit(SYSCALL_VECTOR
, used_vectors
);
957 * Should be a barrier for any external CPU state:
962 x86_quirk_trap_init();