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 <linux/nmi.h>
   9 #include <asm/delay.h>
  10 #include <asm/mc146818rtc.h>
  11
  12 #define NMI_REASON_PORT         0x61
  13
  14 #define NMI_REASON_SERR         0x80
  15 #define NMI_REASON_IOCHK        0x40
  16 #define NMI_REASON_MASK         (NMI_REASON_SERR | NMI_REASON_IOCHK)
  17
  18 #define NMI_REASON_CLEAR_SERR   0x04
  19 #define NMI_REASON_CLEAR_IOCHK  0x08
  20 #define NMI_REASON_CLEAR_MASK   0x0f
  21
  22 static inline unsigned char default_get_nmi_reason(void)
  23 {
  24         return inb(NMI_REASON_PORT);
  25 }
  26
  27 static inline void clear_serr_error(unsigned char reason)
  28 {
  29         reason = (reason & NMI_REASON_CLEAR_MASK) | NMI_REASON_CLEAR_SERR;
  30         outb(reason, NMI_REASON_PORT);
  31 }
  32
  33 static inline void clear_io_check_error(unsigned char reason)
  34 {
  35         unsigned long i;
  36
  37         reason = (reason & NMI_REASON_CLEAR_MASK) | NMI_REASON_CLEAR_IOCHK;
  38         outb(reason, NMI_REASON_PORT);
  39
  40         i = 20000;
  41         while (--i) {
  42                 touch_nmi_watchdog();
  43                 udelay(100);
  44         }
  45
  46         reason &= ~NMI_REASON_CLEAR_IOCHK;
  47         outb(reason, NMI_REASON_PORT);
  48 }
  49
  50 static inline void reassert_nmi(void)
  51 {
  52         int old_reg = -1;
  53
  54         if (do_i_have_lock_cmos())
  55                 old_reg = current_lock_cmos_reg();
  56         else
  57                 lock_cmos(0); /* register doesn't matter here */
  58         outb(0x8f, 0x70);
  59         inb(0x71);              /* dummy */
  60         outb(0x0f, 0x70);
  61         inb(0x71);              /* dummy */
  62         if (old_reg >= 0)
  63                 outb(old_reg, 0x70);
  64         else
  65                 unlock_cmos();
  66 }
  67
  68 #endif /* _ASM_X86_MACH_DEFAULT_MACH_TRAPS_H */