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Subject[RFC 1/6] x86, NMI, Add symbol definition for NMI magic constants
Date
Replace the NMI related magic numbers with symbol constants.

Signed-off-by: Huang Ying <ying.huang@intel.com>
---
arch/x86/include/asm/mach_traps.h | 12 +++++++++++-
arch/x86/kernel/traps.c | 18 +++++++++---------
2 files changed, 20 insertions(+), 10 deletions(-)
--- a/arch/x86/include/asm/mach_traps.h
+++ b/arch/x86/include/asm/mach_traps.h
@@ -7,9 +7,19 @@

#include <asm/mc146818rtc.h>

+#define NMI_REASON_PORT 0x61
+
+#define NMI_REASON_MEMPAR 0x80
+#define NMI_REASON_IOCHK 0x40
+#define NMI_REASON_MASK (NMI_REASON_MEMPAR | NMI_REASON_IOCHK)
+
+#define NMI_REASON_CLEAR_MEMPAR 0x04
+#define NMI_REASON_CLEAR_IOCHK 0x08
+#define NMI_REASON_CLEAR_MASK 0x0f
+
static inline unsigned char get_nmi_reason(void)
{
- return inb(0x61);
+ return inb(NMI_REASON_PORT);
}

static inline void reassert_nmi(void)
--- a/arch/x86/kernel/traps.c
+++ b/arch/x86/kernel/traps.c
@@ -323,8 +323,8 @@ mem_parity_error(unsigned char reason, s
printk(KERN_EMERG "Dazed and confused, but trying to continue\n");

/* Clear and disable the memory parity error line. */
- reason = (reason & 0xf) | 4;
- outb(reason, 0x61);
+ reason = (reason & NMI_REASON_CLEAR_MASK) | NMI_REASON_CLEAR_MEMPAR;
+ outb(reason, NMI_REASON_PORT);
}

static notrace __kprobes void
@@ -339,15 +339,15 @@ io_check_error(unsigned char reason, str
panic("NMI IOCK error: Not continuing");

/* Re-enable the IOCK line, wait for a few seconds */
- reason = (reason & 0xf) | 8;
- outb(reason, 0x61);
+ reason = (reason & NMI_REASON_CLEAR_MASK) | NMI_REASON_CLEAR_IOCHK;
+ outb(reason, NMI_REASON_PORT);

i = 2000;
while (--i)
udelay(1000);

- reason &= ~8;
- outb(reason, 0x61);
+ reason &= ~NMI_REASON_CLEAR_IOCHK;
+ outb(reason, NMI_REASON_PORT);
}

static notrace __kprobes void
@@ -388,7 +388,7 @@ static notrace __kprobes void default_do
if (!cpu)
reason = get_nmi_reason();

- if (!(reason & 0xc0)) {
+ if (!(reason & NMI_REASON_MASK)) {
if (notify_die(DIE_NMI_IPI, "nmi_ipi", regs, reason, 2, SIGINT)
== NOTIFY_STOP)
return;
@@ -418,9 +418,9 @@ static notrace __kprobes void default_do
return;

/* AK: following checks seem to be broken on modern chipsets. FIXME */
- if (reason & 0x80)
+ if (reason & NMI_REASON_MEMPAR)
mem_parity_error(reason, regs);
- if (reason & 0x40)
+ if (reason & NMI_REASON_IOCHK)
io_check_error(reason, regs);
#ifdef CONFIG_X86_32
/*

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