1 files changed, 30 insertions, 14 deletions

diff --git a/include/asm-i386/processor.h b/include/asm-i386/processor.h
index d0d8b0160090..37bef8ed7bed 100644
--- a/include/asm-i386/processor.h
+++ b/include/asm-i386/processor.h
@@ -203,9 +203,7 @@ static inline unsigned int cpuid_edx(unsigned int op)
         return edx;
 }
 
-#define load_cr3(pgdir) \
-        asm volatile("movl %0,%%cr3": :"r" (__pa(pgdir)))
-
+#define load_cr3(pgdir) write_cr3(__pa(pgdir))
 
 /*
  * Intel CPU features in CR4
@@ -232,22 +230,20 @@ extern unsigned long mmu_cr4_features;
 
 static inline void set_in_cr4 (unsigned long mask)
 {
+        unsigned cr4;
         mmu_cr4_features |= mask;
-        __asm__("movl %%cr4,%%eax\n\t"
-                "orl %0,%%eax\n\t"
-                "movl %%eax,%%cr4\n"
-                : : "irg" (mask)
-                :"ax");
+        cr4 = read_cr4();
+        cr4 |= mask;
+        write_cr4(cr4);
 }
 
 static inline void clear_in_cr4 (unsigned long mask)
 {
+        unsigned cr4;
         mmu_cr4_features &= ~mask;
-        __asm__("movl %%cr4,%%eax\n\t"
-                "andl %0,%%eax\n\t"
-                "movl %%eax,%%cr4\n"
-                : : "irg" (~mask)
-                :"ax");
+        cr4 = read_cr4();
+        cr4 &= ~mask;
+        write_cr4(cr4);
 }
 
 /*
@@ -281,6 +277,11 @@ static inline void clear_in_cr4 (unsigned long mask)
         outb((data), 0x23); \
 } while (0)
 
+static inline void serialize_cpu(void)
+{
+         __asm__ __volatile__ ("cpuid" : : : "ax", "bx", "cx", "dx");
+}
+
 static inline void __monitor(const void *eax, unsigned long ecx,
                 unsigned long edx)
 {
@@ -454,6 +455,7 @@ struct thread_struct {
         unsigned int            saved_fs, saved_gs;
 /* IO permissions */
         unsigned long   *io_bitmap_ptr;
+        unsigned long   iopl;
 /* max allowed port in the bitmap, in bytes: */
         unsigned long   io_bitmap_max;
 };
@@ -474,7 +476,6 @@ struct thread_struct {
         .esp0           = sizeof(init_stack) + (long)&init_stack,       \
         .ss0            = __KERNEL_DS,                                  \
         .ss1            = __KERNEL_CS,                                  \
-        .ldt            = GDT_ENTRY_LDT,                                \
         .io_bitmap_base = INVALID_IO_BITMAP_OFFSET,                     \
         .io_bitmap      = { [ 0 ... IO_BITMAP_LONGS] = ~0 },            \
 }
@@ -511,6 +512,21 @@ static inline void load_esp0(struct tss_struct *tss, struct thread_struct *threa
                         : /* no output */                       \
                         :"r" (value))
 
+/*
+ * Set IOPL bits in EFLAGS from given mask
+ */
+static inline void set_iopl_mask(unsigned mask)
+{
+        unsigned int reg;
+        __asm__ __volatile__ ("pushfl;"
+                              "popl %0;"
+                              "andl %1, %0;"
+                              "orl %2, %0;"
+                              "pushl %0;"
+                              "popfl"
+                                : "=&r" (reg)
+                                : "i" (~X86_EFLAGS_IOPL), "r" (mask));
+}
 
 /* Forward declaration, a strange C thing */
 struct task_struct;