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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>
This commit is contained in:
Zachary Amsden
2005-09-03 15:56:38 -07:00
committed by Linus Torvalds
parent 245067d167
commit 4d37e7e3fd
11 changed files with 43 additions and 40 deletions
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5
arch/i386/kernel/efi.c
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@@ -104,8 +104,7 @@ static void efi_call_phys_prelog(void)
local_flush_tlb();
cpu_gdt_descr[0].address = __pa(cpu_gdt_descr[0].address);
__asm__ __volatile__("lgdt %0":"=m"
(*(struct Xgt_desc_struct *) __pa(&cpu_gdt_descr[0])));
load_gdt((struct Xgt_desc_struct *) __pa(&cpu_gdt_descr[0]));
}
static void efi_call_phys_epilog(void)
@@ -114,7 +113,7 @@ static void efi_call_phys_epilog(void)
cpu_gdt_descr[0].address =
(unsigned long) __va(cpu_gdt_descr[0].address);
__asm__ __volatile__("lgdt %0":"=m"(cpu_gdt_descr));
load_gdt(&cpu_gdt_descr[0]);
cr4 = read_cr4();
if (cr4 & X86_CR4_PSE) {