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x86: Centaur Isaiah processor to use sysenter in 64-bit compatibility mode rather than syscall

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Upcoming 64 bit processors from Centaur can use sysenter.

Signed-off-by: Dave Jones <davej@codemonkey.org.uk>
Signed-off-by: Jesse Ahrens <jahrens@centtech.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Dave Jones
2008-03-26 12:09:16 -04:00
committed by Ingo Molnar
parent aa040b2f06
commit 0e03eb86b5
2 changed files with 41 additions and 2 deletions
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8
arch/x86/vdso/vdso32-setup.c
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@@ -210,8 +210,12 @@ static int use_sysenter __read_mostly = -1;
/* May not be __init: called during resume */
void syscall32_cpu_init(void)
{
if (use_sysenter < 0)
use_sysenter = (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL);
if (use_sysenter < 0) {
if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL)
use_sysenter = 1;
if (boot_cpu_data.x86_vendor == X86_VENDOR_CENTAUR)
use_sysenter = 1;
}
/* Load these always in case some future AMD CPU supports
SYSENTER from compat mode too. */