1 files changed, 28 insertions, 8 deletions

diff --git a/include/asm-i386/system.h b/include/asm-i386/system.h
index 3db717a244f0..acd5c26b69ba 100644
--- a/include/asm-i386/system.h
+++ b/include/asm-i386/system.h
@@ -14,8 +14,7 @@ extern struct task_struct * FASTCALL(__switch_to(struct task_struct *prev, struc
 
 #define switch_to(prev,next,last) do {                                  \
         unsigned long esi,edi;                                          \
-        asm volatile("pushfl\n\t"                                       \
-                     "pushl %%ebp\n\t"                                  \
+        asm volatile("pushl %%ebp\n\t"                                  \
                      "movl %%esp,%0\n\t"        /* save ESP */          \
                      "movl %5,%%esp\n\t"        /* restore ESP */       \
                      "movl $1f,%1\n\t"          /* save EIP */          \
@@ -23,7 +22,6 @@ extern struct task_struct * FASTCALL(__switch_to(struct task_struct *prev, struc
                      "jmp __switch_to\n"                                \
                      "1:\t"                                             \
                      "popl %%ebp\n\t"                                   \
-                     "popfl"                                            \
                      :"=m" (prev->thread.esp),"=m" (prev->thread.eip),  \
                       "=a" (last),"=S" (esi),"=D" (edi)                 \
                      :"m" (next->thread.esp),"m" (next->thread.eip),    \
@@ -93,13 +91,13 @@ static inline unsigned long _get_base(char * addr)
                 ".align 4\n\t"                  \
                 ".long 1b,3b\n"                 \
                 ".previous"                     \
-                : :"m" (value))
+                : :"rm" (value))
 
 /*
  * Save a segment register away
  */
 #define savesegment(seg, value) \
-        asm volatile("mov %%" #seg ",%0":"=m" (value))
+        asm volatile("mov %%" #seg ",%0":"=rm" (value))
 
 /*
  * Clear and set 'TS' bit respectively
@@ -107,13 +105,33 @@ 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 +141,7 @@ 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 +465,8 @@ 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()                 \
 ({                                      \