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[PATCH] i386: inline assembler: cleanup and encapsulate descriptor and task register management

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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>
Este commit está contenido en:
Zachary Amsden
2005-09-03 15:56:38 -07:00
cometido por Linus Torvalds
padre 245067d167
commit 4d37e7e3fd
Se han modificado 11 ficheros con 43 adiciones y 40 borrados
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26
arch/i386/power/cpu.c
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@@ -42,17 +42,17 @@ void __save_processor_state(struct saved_context *ctxt)
/*
* descriptor tables
*/
asm volatile ("sgdt %0" : "=m" (ctxt->gdt_limit));
asm volatile ("sidt %0" : "=m" (ctxt->idt_limit));
asm volatile ("str %0" : "=m" (ctxt->tr));
store_gdt(&ctxt->gdt_limit);
store_idt(&ctxt->idt_limit);
store_tr(ctxt->tr);
/*
* segment registers
*/
asm volatile ("movw %%es, %0" : "=m" (ctxt->es));
asm volatile ("movw %%fs, %0" : "=m" (ctxt->fs));
asm volatile ("movw %%gs, %0" : "=m" (ctxt->gs));
asm volatile ("movw %%ss, %0" : "=m" (ctxt->ss));
savesegment(es, ctxt->es);
savesegment(fs, ctxt->fs);
savesegment(gs, ctxt->gs);
savesegment(ss, ctxt->ss);
/*
* control registers
@@ -118,16 +118,16 @@ void __restore_processor_state(struct saved_context *ctxt)
* now restore the descriptor tables to their proper values
* ltr is done i fix_processor_context().
*/
asm volatile ("lgdt %0" :: "m" (ctxt->gdt_limit));
asm volatile ("lidt %0" :: "m" (ctxt->idt_limit));
load_gdt(&ctxt->gdt_limit);
load_idt(&ctxt->idt_limit);
/*
* segment registers
*/
asm volatile ("movw %0, %%es" :: "r" (ctxt->es));
asm volatile ("movw %0, %%fs" :: "r" (ctxt->fs));
asm volatile ("movw %0, %%gs" :: "r" (ctxt->gs));
asm volatile ("movw %0, %%ss" :: "r" (ctxt->ss));
loadsegment(es, ctxt->es);
loadsegment(fs, ctxt->fs);
loadsegment(gs, ctxt->gs);
loadsegment(ss, ctxt->ss);
/*
* sysenter MSRs