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x86_64: add pseudo-features for 32-bit compat syscall 

Add pseudo-feature bits to describe whether the CPU supports sysenter
and/or syscall from ia32-compat userspace.  This removes a hardcoded
test in vdso32-setup.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Jeremy Fitzhardinge 2008-07-10 16:22:56 -07:00 committed by Ingo Molnar
parent 3d0decc4f4
commit 8d28aab59f
4 changed files with 9 additions and 2 deletions
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2
arch/x86/kernel/cpu/centaur_64.c
View File

@ -10,6 +10,8 @@ static void __cpuinit early_init_centaur(struct cpuinfo_x86 *c)
{
if (c->x86 == 0x6 && c->x86_model >= 0xf)
set_cpu_cap(c, X86_FEATURE_CONSTANT_TSC);
set_cpu_cap(c, X86_FEATURE_SYSENTER32);
}
static void __cpuinit init_centaur(struct cpuinfo_x86 *c)

3
arch/x86/kernel/cpu/common_64.c
View File

@ -314,6 +314,9 @@ static void __cpuinit early_identify_cpu(struct cpuinfo_x86 *c)
if (c->extended_cpuid_level >= 0x80000007)
c->x86_power = cpuid_edx(0x80000007);
/* Assume all 64-bit CPUs support 32-bit syscall */
set_cpu_cap(c, X86_FEATURE_SYSCALL32);
if (c->x86_vendor != X86_VENDOR_UNKNOWN &&
cpu_devs[c->x86_vendor]->c_early_init)
cpu_devs[c->x86_vendor]->c_early_init(c);

2
arch/x86/kernel/cpu/intel_64.c
View File

@ -12,6 +12,8 @@ static void __cpuinit early_init_intel(struct cpuinfo_x86 *c)
if ((c->x86 == 0xf && c->x86_model >= 0x03) ||
(c->x86 == 0x6 && c->x86_model >= 0x0e))
set_cpu_cap(c, X86_FEATURE_CONSTANT_TSC);
set_cpu_cap(c, X86_FEATURE_SYSENTER32);
}
/*

4
include/asm-x86/cpufeature.h
View File

@ -74,8 +74,8 @@
#define X86_FEATURE_ARCH_PERFMON (3*32+11) /* Intel Architectural PerfMon */
#define X86_FEATURE_PEBS (3*32+12) /* Precise-Event Based Sampling */
#define X86_FEATURE_BTS (3*32+13) /* Branch Trace Store */
/* 14 free */
/* 15 free */
#define X86_FEATURE_SYSCALL32 (3*32+14) /* syscall in ia32 userspace */
#define X86_FEATURE_SYSENTER32 (3*32+15) /* sysenter in ia32 userspace */
#define X86_FEATURE_REP_GOOD (3*32+16) /* rep microcode works well on this CPU */
#define X86_FEATURE_MFENCE_RDTSC (3*32+17) /* Mfence synchronizes RDTSC */
#define X86_FEATURE_LFENCE_RDTSC (3*32+18) /* Lfence synchronizes RDTSC */