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Date:	Fri, 30 Mar 2007 13:12:23 +1000
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Andi Kleen <ak@....de>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Jeremy Fitzhardinge <jeremy@...source.com>,
	Gerd Hoffmann <kraxel@...e.de>,
	Alan <alan@...rguk.ukuu.org.uk>, Ingo Molnar <mingo@...e.hu>,
	lkml - Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [PATCH] Use X86_EFLAGS_IF in x86-64/irqflags.h.

On Thu, 2007-03-29 at 14:19 +0200, Andi Kleen wrote:
> On Thu, Mar 29, 2007 at 09:06:57PM +1000, Rusty Russell wrote:

[SNIP: processor-flags.h patch for i386 ]

> Ok. Can you do it for x86-64 too?

OK, here it is.  Compiles, but -rc5-mm2 doesn't link for me on x86-64 at
the moment.

Something seems quite wrong with CONFIG_X86_VSMP.  AFAICT (1 << 18) is
the "alignment check" flag, not the "virtual interrupt" flag which I
expected.

Cheers,
Rusty.
==
As per i386 patch: move X86_EFLAGS_IF et al out to a new header:
processor-flags.h, so we can include it from irqflags.h and use it in
raw_irqs_disabled_flags().

As a side-effect, we could now use these flags in .S files.

Signed-off-by: Rusty Russell <rusty@...tcorp.com.au>

diff -r 533294f1af63 include/asm-x86_64/irqflags.h
--- a/include/asm-x86_64/irqflags.h	Thu Mar 29 18:52:58 2007 +1000
+++ b/include/asm-x86_64/irqflags.h	Fri Mar 30 12:57:01 2007 +1000
@@ -9,6 +9,7 @@
  */
 #ifndef _ASM_IRQFLAGS_H
 #define _ASM_IRQFLAGS_H
+#include <asm/processor-flags.h>
 
 #ifndef __ASSEMBLY__
 /*
@@ -53,19 +54,19 @@ static inline void raw_local_irq_disable
 {
 	unsigned long flags = __raw_local_save_flags();
 
-	raw_local_irq_restore((flags & ~(1 << 9)) | (1 << 18));
+	raw_local_irq_restore((flags & ~X86_EFLAGS_IF) | X86_EFLAGS_AC);
 }
 
 static inline void raw_local_irq_enable(void)
 {
 	unsigned long flags = __raw_local_save_flags();
 
-	raw_local_irq_restore((flags | (1 << 9)) & ~(1 << 18));
+	raw_local_irq_restore((flags | X86_EFLAGS_IF) & (~X86_EFLAGS_AC));
 }
 
 static inline int raw_irqs_disabled_flags(unsigned long flags)
 {
-	return !(flags & (1<<9)) || (flags & (1 << 18));
+	return !(flags & X86_EFLAGS_IF) || (flags & X86_EFLAGS_AC);
 }
 
 #else /* CONFIG_X86_VSMP */
@@ -82,7 +83,7 @@ static inline void raw_local_irq_enable(
 
 static inline int raw_irqs_disabled_flags(unsigned long flags)
 {
-	return !(flags & (1 << 9));
+	return !(flags & X86_EFLAGS_IF);
 }
 
 #endif
diff -r 533294f1af63 include/asm-x86_64/processor-flags.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/include/asm-x86_64/processor-flags.h	Fri Mar 30 12:48:11 2007 +1000
@@ -0,0 +1,26 @@
+#ifndef __ASM_X86_64_PROCESSOR_FLAGS_H
+#define __ASM_X86_64_PROCESSOR_FLAGS_H
+/* Various flags defined: can be included from assembler. */
+
+/*
+ * EFLAGS bits
+ */
+#define X86_EFLAGS_CF	0x00000001 /* Carry Flag */
+#define X86_EFLAGS_PF	0x00000004 /* Parity Flag */
+#define X86_EFLAGS_AF	0x00000010 /* Auxillary carry Flag */
+#define X86_EFLAGS_ZF	0x00000040 /* Zero Flag */
+#define X86_EFLAGS_SF	0x00000080 /* Sign Flag */
+#define X86_EFLAGS_TF	0x00000100 /* Trap Flag */
+#define X86_EFLAGS_IF	0x00000200 /* Interrupt Flag */
+#define X86_EFLAGS_DF	0x00000400 /* Direction Flag */
+#define X86_EFLAGS_OF	0x00000800 /* Overflow Flag */
+#define X86_EFLAGS_IOPL	0x00003000 /* IOPL mask */
+#define X86_EFLAGS_NT	0x00004000 /* Nested Task */
+#define X86_EFLAGS_RF	0x00010000 /* Resume Flag */
+#define X86_EFLAGS_VM	0x00020000 /* Virtual Mode */
+#define X86_EFLAGS_AC	0x00040000 /* Alignment Check */
+#define X86_EFLAGS_VIF	0x00080000 /* Virtual Interrupt Flag */
+#define X86_EFLAGS_VIP	0x00100000 /* Virtual Interrupt Pending */
+#define X86_EFLAGS_ID	0x00200000 /* CPUID detection flag */
+
+#endif /* __ASM_X86_64_PROCESSOR_FLAGS_H */
diff -r 533294f1af63 include/asm-x86_64/processor.h
--- a/include/asm-x86_64/processor.h	Thu Mar 29 18:52:58 2007 +1000
+++ b/include/asm-x86_64/processor.h	Fri Mar 30 12:44:11 2007 +1000
@@ -20,6 +20,7 @@
 #include <asm/percpu.h>
 #include <linux/personality.h>
 #include <linux/cpumask.h>
+#include <asm/processor-flags.h>
 
 #define TF_MASK		0x00000100
 #define IF_MASK		0x00000200
@@ -103,27 +104,6 @@ extern unsigned short num_cache_leaves;
 extern unsigned short num_cache_leaves;
 
 /*
- * EFLAGS bits
- */
-#define X86_EFLAGS_CF	0x00000001 /* Carry Flag */
-#define X86_EFLAGS_PF	0x00000004 /* Parity Flag */
-#define X86_EFLAGS_AF	0x00000010 /* Auxillary carry Flag */
-#define X86_EFLAGS_ZF	0x00000040 /* Zero Flag */
-#define X86_EFLAGS_SF	0x00000080 /* Sign Flag */
-#define X86_EFLAGS_TF	0x00000100 /* Trap Flag */
-#define X86_EFLAGS_IF	0x00000200 /* Interrupt Flag */
-#define X86_EFLAGS_DF	0x00000400 /* Direction Flag */
-#define X86_EFLAGS_OF	0x00000800 /* Overflow Flag */
-#define X86_EFLAGS_IOPL	0x00003000 /* IOPL mask */
-#define X86_EFLAGS_NT	0x00004000 /* Nested Task */
-#define X86_EFLAGS_RF	0x00010000 /* Resume Flag */
-#define X86_EFLAGS_VM	0x00020000 /* Virtual Mode */
-#define X86_EFLAGS_AC	0x00040000 /* Alignment Check */
-#define X86_EFLAGS_VIF	0x00080000 /* Virtual Interrupt Flag */
-#define X86_EFLAGS_VIP	0x00100000 /* Virtual Interrupt Pending */
-#define X86_EFLAGS_ID	0x00200000 /* CPUID detection flag */
-
-/*
  * Intel CPU features in CR4
  */
 #define X86_CR4_VME		0x0001	/* enable vm86 extensions */


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