i386 Transparent Paravirtualization Subarch Patch #3
This change encapsulates privileged control register and flags accessors into
the sub-architecture layer. The goal is a clean, uniform interface that may
be redefined on new sub-architectures of i386.
Diffs against: linux-2.6.13-rc4-mm1
Signed-off-by: Zachary Amsden <[email protected]>
Index: linux-2.6.13/include/asm-i386/system.h
===================================================================
--- linux-2.6.13.orig/include/asm-i386/system.h 2005-08-03 16:24:16.000000000 -0700
+++ linux-2.6.13/include/asm-i386/system.h 2005-08-03 16:27:00.000000000 -0700
@@ -100,56 +100,8 @@
#define savesegment(seg, value) \
asm volatile("mov %%" #seg ",%0":"=rm" (value))
-/*
- * Clear and set 'TS' bit respectively
- */
-#define clts() __asm__ __volatile__ ("clts")
-#define read_cr0() ({ \
- unsigned int __dummy; \
- __asm__ __volatile__( \
- "movl %%cr0,%0\n\t" \
- :"=r" (__dummy)); \
- __dummy; \
-})
-#define write_cr0(x) \
- __asm__ __volatile__("movl %0,%%cr0": :"r" (x));
-
-#define read_cr2() ({ \
- unsigned int __dummy; \
- __asm__ __volatile__( \
- "movl %%cr2,%0\n\t" \
- :"=r" (__dummy)); \
- __dummy; \
-})
-#define write_cr2(x) \
- __asm__ __volatile__("movl %0,%%cr2": :"r" (x));
-
-#define read_cr3() ({ \
- unsigned int __dummy; \
- __asm__ ( \
- "movl %%cr3,%0\n\t" \
- :"=r" (__dummy)); \
- __dummy; \
-})
-#define write_cr3(x) \
- __asm__ __volatile__("movl %0,%%cr3": :"r" (x));
-
-#define read_cr4() ({ \
- unsigned int __dummy; \
- __asm__( \
- "movl %%cr4,%0\n\t" \
- :"=r" (__dummy)); \
- __dummy; \
-})
-#define write_cr4(x) \
- __asm__ __volatile__("movl %0,%%cr4": :"r" (x));
-#define stts() write_cr0(8 | read_cr0())
-
#endif /* __KERNEL__ */
-#define wbinvd() \
- __asm__ __volatile__ ("wbinvd": : :"memory");
-
static inline unsigned long get_limit(unsigned long segment)
{
unsigned long __limit;
@@ -459,15 +411,7 @@
#define set_wmb(var, value) do { var = value; wmb(); } while (0)
-/* interrupt control.. */
-#define local_save_flags(x) do { typecheck(unsigned long,x); __asm__ __volatile__("pushfl ; popl %0":"=g" (x): /* no input */); } while (0)
-#define local_irq_restore(x) do { typecheck(unsigned long,x); __asm__ __volatile__("pushl %0 ; popfl": /* no output */ :"g" (x):"memory", "cc"); } while (0)
-#define local_irq_disable() __asm__ __volatile__("cli": : :"memory")
-#define local_irq_enable() __asm__ __volatile__("sti": : :"memory")
-/* used in the idle loop; sti takes one instruction cycle to complete */
-#define safe_halt() __asm__ __volatile__("sti; hlt": : :"memory")
-/* used when interrupts are already enabled or to shutdown the processor */
-#define halt() __asm__ __volatile__("hlt": : :"memory")
+#include <mach_system.h>
#define irqs_disabled() \
({ \
@@ -476,9 +420,6 @@
!(flags & (1<<9)); \
})
-/* For spinlocks etc */
-#define local_irq_save(x) __asm__ __volatile__("pushfl ; popl %0 ; cli":"=g" (x): /* no input */ :"memory")
-
/*
* disable hlt during certain critical i/o operations
*/
Index: linux-2.6.13/include/asm-i386/mach-default/mach_system.h
===================================================================
--- linux-2.6.13.orig/include/asm-i386/mach-default/mach_system.h 2005-08-03 16:27:00.000000000 -0700
+++ linux-2.6.13/include/asm-i386/mach-default/mach_system.h 2005-08-03 16:29:32.000000000 -0700
@@ -0,0 +1,76 @@
+/*
+ * include/asm-i386/mach-default/mach_system.h
+ *
+ * Copyright (C) 2005, VMware, Inc & other authors
+ * Moved from include/asm-i386/system.h 07/05
+ *
+ */
+
+#ifndef _MACH_SYSTEM_H
+#define _MACH_SYSTEM_H
+
+#define read_cr0() ({ \
+ unsigned int __dummy; \
+ __asm__ __volatile__( \
+ "movl %%cr0,%0\n\t" \
+ :"=r" (__dummy)); \
+ __dummy; \
+})
+#define write_cr0(x) \
+ __asm__ __volatile__("movl %0,%%cr0": :"r" (x));
+
+#define read_cr2() ({ \
+ unsigned int __dummy; \
+ __asm__ __volatile__( \
+ "movl %%cr2,%0\n\t" \
+ :"=r" (__dummy)); \
+ __dummy; \
+})
+#define write_cr2(x) \
+ __asm__ __volatile__("movl %0,%%cr2": :"r" (x));
+
+#define read_cr3() ({ \
+ unsigned int __dummy; \
+ __asm__ ( \
+ "movl %%cr3,%0\n\t" \
+ :"=r" (__dummy)); \
+ __dummy; \
+})
+#define write_cr3(x) \
+ __asm__ __volatile__("movl %0,%%cr3": :"r" (x));
+
+#define read_cr4() ({ \
+ unsigned int __dummy; \
+ __asm__( \
+ "movl %%cr4,%0\n\t" \
+ :"=r" (__dummy)); \
+ __dummy; \
+})
+#define write_cr4(x) \
+ __asm__ __volatile__("movl %0,%%cr4": :"r" (x));
+
+/*
+ * Clear and set 'TS' bit respectively
+ */
+#define clts() __asm__ __volatile__ ("clts")
+#define stts() write_cr0(8 | read_cr0())
+
+#define wbinvd() \
+ __asm__ __volatile__ ("wbinvd": : :"memory");
+
+/* interrupt control.. */
+#define local_save_flags(x) do { typecheck(unsigned long,x); __asm__ __volatile__("pushfl ; popl %0":"=g" (x): /* no input */); } while (0)
+#define local_irq_restore(x) do { typecheck(unsigned long,x); __asm__ __volatile__("pushl %0 ; popfl": /* no output */ :"g" (x):"memory", "cc"); } while (0)
+#define local_irq_disable() __asm__ __volatile__("cli": : :"memory")
+#define local_irq_enable() __asm__ __volatile__("sti": : :"memory")
+
+/* For spinlocks etc */
+#define local_irq_save(x) __asm__ __volatile__("pushfl ; popl %0 ; cli":"=g" (x): /* no input */ :"memory")
+
+/* used in the idle loop; sti holds off interrupts for 1 instruction */
+#define safe_halt() __asm__ __volatile__("sti; hlt": : :"memory")
+
+/* halt until interrupted */
+#define halt() __asm__ __volatile__("hlt")
+
+#endif
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