linux-kernel - [RFC 1/6] x86, NMI, Add symbol definition for NMI magic constants

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Date:	Fri, 10 Sep 2010 10:51:00 +0800
From:	Huang Ying <ying.huang@...el.com>
To:	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>
Cc:	linux-kernel@...r.kernel.org, Andi Kleen <andi@...stfloor.org>,
	Huang Ying <ying.huang@...el.com>
Subject: [RFC 1/6] x86, NMI, Add symbol definition for NMI magic constants

Replace the NMI related magic numbers with symbol constants.

Signed-off-by: Huang Ying <ying.huang@...el.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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