arch/x86/include/asm/mach_traps.h

   1 /*
   2  *  Machine specific NMI handling for generic.
   3  *  Split out from traps.c by Osamu Tomita <tomita@cinet.co.jp>
   4  */
   5 #ifndef _ASM_X86_MACH_DEFAULT_MACH_TRAPS_H
   6 #define _ASM_X86_MACH_DEFAULT_MACH_TRAPS_H
   7
   8 #include <asm/mc146818rtc.h>
   9
  10 #define NMI_REASON_PORT         0x61
  11
  12 #define NMI_REASON_SERR         0x80
  13 #define NMI_REASON_IOCHK        0x40
  14 #define NMI_REASON_MASK         (NMI_REASON_SERR | NMI_REASON_IOCHK)
  15
  16 #define NMI_REASON_CLEAR_SERR   0x04
  17 #define NMI_REASON_CLEAR_IOCHK  0x08
  18 #define NMI_REASON_CLEAR_MASK   0x0f
  19
  20 static inline unsigned char get_nmi_reason(void)
  21 {
  22         return inb(NMI_REASON_PORT);
  23 }
  24
  25 static inline void reassert_nmi(void)
  26 {
  27         int old_reg = -1;
  28
  29         if (do_i_have_lock_cmos())
  30                 old_reg = current_lock_cmos_reg();
  31         else
  32                 lock_cmos(0); /* register doesn't matter here */
  33         outb(0x8f, 0x70);
  34         inb(0x71);              /* dummy */
  35         outb(0x0f, 0x70);
  36         inb(0x71);              /* dummy */
  37         if (old_reg >= 0)
  38                 outb(old_reg, 0x70);
  39         else
  40                 unlock_cmos();
  41 }
  42
  43 #endif /* _ASM_X86_MACH_DEFAULT_MACH_TRAPS_H */