bitkeeper revision 1.952 (40c8935a3XSRdQfnx5RoO7XgaggvOQ)

Towards x86_64 support. Merged a bunch of the existing x86_64 stuff
back into a generic 'x86' architecture. Aim is to share as much
as possible between 32- and 64-bit worlds.

1 files changed, 29 insertions, 0 deletions

diff --git a/xen/include/asm-x86/ldt.h b/xen/include/asm-x86/ldt.h
new file mode 100644
index 0000000000..4da2a15afc
--- /dev/null
+++ b/xen/include/asm-x86/ldt.h
@@ -0,0 +1,29 @@
+#ifndef __ARCH_LDT_H
+#define __ARCH_LDT_H
+
+#ifndef __ASSEMBLY__
+
+static inline void load_LDT(struct task_struct *p)
+{
+    unsigned int cpu;
+    struct desc_struct *desc;
+    unsigned long ents;
+                                                                                                
+    if ( (ents = p->mm.ldt_ents) == 0 )
+    {
+        __asm__ __volatile__ ( "lldt %%ax" : : "a" (0) );
+    }
+    else
+    {
+        cpu = smp_processor_id();
+        desc = (struct desc_struct *)GET_GDT_ADDRESS(p) + __LDT(cpu);
+        desc->a = ((LDT_VIRT_START&0xffff)<<16) | (ents*8-1);
+        desc->b = (LDT_VIRT_START&(0xff<<24)) | 0x8200 |
+            ((LDT_VIRT_START&0xff0000)>>16);
+        __asm__ __volatile__ ( "lldt %%ax" : : "a" (__LDT(cpu)<<3) );
+    }
+}
+
+#endif /* !__ASSEMBLY__ */
+
+#endif