1 files changed, 25 insertions, 3 deletions

diff --git a/include/asm-i386/system.h b/include/asm-i386/system.h
index 3db717a244f0..8048a5e018cd 100644
--- a/include/asm-i386/system.h
+++ b/include/asm-i386/system.h
@@ -107,13 +107,33 @@ static inline unsigned long _get_base(char * addr)
 #define clts() __asm__ __volatile__ ("clts")
 #define read_cr0() ({ \
         unsigned int __dummy; \
-        __asm__( \
+        __asm__ __volatile__( \
                 "movl %%cr0,%0\n\t" \
                 :"=r" (__dummy)); \
         __dummy; \
 })
 #define write_cr0(x) \
-        __asm__("movl %0,%%cr0": :"r" (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; \
@@ -123,7 +143,7 @@ static inline unsigned long _get_base(char * addr)
         __dummy; \
 })
 #define write_cr4(x) \
-        __asm__("movl %0,%%cr4": :"r" (x));
+        __asm__ __volatile__("movl %0,%%cr4": :"r" (x));
 #define stts() write_cr0(8 | read_cr0())
 
 #endif  /* __KERNEL__ */
@@ -447,6 +467,8 @@ struct alt_instr {
 #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")
 
 #define irqs_disabled()                 \
 ({                                      \