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cpu: cache the maximum input value for CPUID extended function

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Per SDM:

    When CPUID executes with EAX set to 80000000H, the processor returns
    the highest value the processor recognizes for returning extended
    processor information. The value is returned in the EAX register and is
    processor specific.

This patch caches this value in the global cpuinfo_x86.cpuid_leaves. This
value will be used to check the availability of any CPUID extended
function.

Signed-off-by: Junjie Mao <junjie.mao@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>
This commit is contained in:
Junjie Mao
2018-04-02 23:51:49 +08:00
committed by Jack Ren
parent 4542d3775d
commit cc975f7858
3 changed files with 10 additions and 1 deletions
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1
hypervisor/include/arch/x86/cpu.h
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@@ -225,6 +225,7 @@ enum feature_word {
FEAT_7_0_EBX, /* CPUID[EAX=7,ECX=0].EBX */
FEAT_7_0_ECX, /* CPUID[EAX=7,ECX=0].ECX */
FEAT_7_0_EDX, /* CPUID[EAX=7,ECX=0].EDX */
FEAT_8000_0000_EAX, /* CPUID[8000_0000].EAX */
FEAT_8000_0001_ECX, /* CPUID[8000_0001].ECX */
FEAT_8000_0001_EDX, /* CPUID[8000_0001].EDX */
FEATURE_WORDS,

3
hypervisor/include/arch/x86/cpuid.h
View File

@@ -113,7 +113,8 @@
#define CPUID_TLB 2
#define CPUID_SERIALNUM 3
#define CPUID_EXTEND_FEATURE 7
#define CPUID_EXTEND_FUNCTION_1 0x80000001
#define CPUID_MAX_EXTENDED_FUNCTION 0x80000000
#define CPUID_EXTEND_FUNCTION_1 0x80000001
static inline void __cpuid(uint32_t *eax, uint32_t *ebx,
uint32_t *ecx, uint32_t *edx)