Use an early clobber on addr to avoid the extra rorl instruction at the
end of _set_tssldt_desc.
Also, get some C type checking on the descriptor struct here.
Signed-off-by: Zachary Amsden <zach@vmware.com>
Index: linux-2.6.13/include/asm-i386/desc.h
==================================================================---
linux-2.6.13.orig/include/asm-i386/desc.h 2005-08-08 15:41:11.000000000 -0700
+++ linux-2.6.13/include/asm-i386/desc.h 2005-08-08 15:47:01.000000000 -0700
@@ -51,17 +51,21 @@
extern struct desc_struct default_ldt[];
extern void set_intr_gate(unsigned int irq, void * addr);
-#define _set_tssldt_desc(n,addr,limit,type) \
-asm volatile ("movw %w3,0(%2)\n\t" \
- "movw %w1,2(%2)\n\t" \
- "rorl $16,%1\n\t" \
- "movb %b1,4(%2)\n\t" \
- "movb %4,5(%2)\n\t" \
- "movb $0,6(%2)\n\t" \
- "movb %h1,7(%2)\n\t" \
- "rorl $16,%1" \
- : "=m"(*(n)) : "q" (addr), "r"(n),
"ir"(limit), "i"(type))
-
+#define _set_tssldt_desc(desc,addr,limit,type) \
+do { \
+ unsigned long __tmp; \
+ typecheck(struct desc_struct *, desc); \
+ asm volatile ("movw %w4,0(%3)\n\t" \
+ "movw %w2,2(%3)\n\t" \
+ "rorl $16,%2\n\t" \
+ "movb %b2,4(%3)\n\t" \
+ "movb %5,5(%3)\n\t" \
+ "movb $0,6(%3)\n\t" \
+ "movb %h2,7(%3)\n\t" \
+ : "=m"(*(desc)), "=&q" (__tmp) \
+ : "1" (addr), "r"(desc), "ir"(limit),
"i"(type)); \
+} while (0)
+
static inline void __set_tss_desc(unsigned int cpu, unsigned int entry, void
*addr)
{
_set_tssldt_desc(&per_cpu(cpu_gdt_table, cpu)[entry], (int)addr,
