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 default_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 */ 44