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authorZachary Amsden <zach@vmware.com>2005-09-03 18:56:38 -0400
committerLinus Torvalds <torvalds@evo.osdl.org>2005-09-05 03:06:11 -0400
commit4d37e7e3fd851428dede4d05d3e69d03795a744a (patch)
treef830928a0baf81f462bc9176dacbaad2dac2bb65 /include/asm-i386/desc.h
parent245067d1674d451855692fcd4647daf9fd47f82d (diff)
[PATCH] i386: inline assembler: cleanup and encapsulate descriptor and task register management
i386 inline assembler cleanup. This change encapsulates descriptor and task register management. Also, it is possible to improve assembler generation in two cases; savesegment may store the value in a register instead of a memory location, which allows GCC to optimize stack variables into registers, and MOV MEM, SEG is always a 16-bit write to memory, making the casting in math-emu unnecessary. Signed-off-by: Zachary Amsden <zach@vmware.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/asm-i386/desc.h')
-rw-r--r--include/asm-i386/desc.h10
1 files changed, 10 insertions, 0 deletions
diff --git a/include/asm-i386/desc.h b/include/asm-i386/desc.h
index 11e67811a990..9a0b85a52e71 100644
--- a/include/asm-i386/desc.h
+++ b/include/asm-i386/desc.h
@@ -30,6 +30,16 @@ extern struct Xgt_desc_struct idt_descr, cpu_gdt_descr[NR_CPUS];
30#define load_TR_desc() __asm__ __volatile__("ltr %%ax"::"a" (GDT_ENTRY_TSS*8)) 30#define load_TR_desc() __asm__ __volatile__("ltr %%ax"::"a" (GDT_ENTRY_TSS*8))
31#define load_LDT_desc() __asm__ __volatile__("lldt %%ax"::"a" (GDT_ENTRY_LDT*8)) 31#define load_LDT_desc() __asm__ __volatile__("lldt %%ax"::"a" (GDT_ENTRY_LDT*8))
32 32
33#define load_gdt(dtr) __asm__ __volatile("lgdt %0"::"m" (*dtr))
34#define load_idt(dtr) __asm__ __volatile("lidt %0"::"m" (*dtr))
35#define load_tr(tr) __asm__ __volatile("ltr %0"::"mr" (tr))
36#define load_ldt(ldt) __asm__ __volatile("lldt %0"::"mr" (ldt))
37
38#define store_gdt(dtr) __asm__ ("sgdt %0":"=m" (*dtr))
39#define store_idt(dtr) __asm__ ("sidt %0":"=m" (*dtr))
40#define store_tr(tr) __asm__ ("str %0":"=mr" (tr))
41#define store_ldt(ldt) __asm__ ("sldt %0":"=mr" (ldt))
42
33/* 43/*
34 * This is the ldt that every process will get unless we need 44 * This is the ldt that every process will get unless we need
35 * something other than this. 45 * something other than this.