diff options
| author | Nico Huber <nico.h@gmx.de> | 2020-10-11 22:32:58 +0200 |
|---|---|---|
| committer | Angel Pons <th3fanbus@gmail.com> | 2020-10-16 22:07:27 +0000 |
| commit | d32bb116f063d04e0c5f72e6fd0367d6e542c9fb (patch) | |
| tree | a7b532bba0f916d57da2479654e34d3f9e10ed69 /payloads | |
| parent | b53858bacee1b3561ab0c70e3f82196f4e7eb6cb (diff) | |
libpayload/x86: Add some more CPUID helpers
Change-Id: Ic88defd30c6d3791a51b78a14135aff55e89394d
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/46285
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Michael Niewöhner <foss@mniewoehner.de>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Diffstat (limited to 'payloads')
| -rw-r--r-- | payloads/libpayload/include/x86/arch/cpuid.h | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/payloads/libpayload/include/x86/arch/cpuid.h b/payloads/libpayload/include/x86/arch/cpuid.h index 83733016fe..c77be9cff2 100644 --- a/payloads/libpayload/include/x86/arch/cpuid.h +++ b/payloads/libpayload/include/x86/arch/cpuid.h @@ -32,4 +32,36 @@ #define cpuid(fn, eax, ebx, ecx, edx) \ asm("cpuid" : "=a"(eax), "=b"(ebx), "=c"(ecx), "=d"(edx) : "0"(fn)) +#define _declare_cpuid(reg) \ + static inline unsigned int cpuid_##reg(unsigned int fn) \ + { \ + unsigned int eax, ebx, ecx, edx; \ + cpuid(fn, eax, ebx, ecx, edx); \ + return reg; \ + } + +_declare_cpuid(eax) +_declare_cpuid(ebx) +_declare_cpuid(ecx) +_declare_cpuid(edx) + +#undef _declare_cpuid + +static inline unsigned int cpuid_max(void) +{ + return cpuid_eax(0); +} + +static inline unsigned int cpuid_family(void) +{ + const unsigned int eax = cpuid_eax(1); + return (eax & 0xff00000) >> (20 - 4) | (eax & 0xf00) >> 8; +} + +static inline unsigned int cpuid_model(void) +{ + const unsigned int eax = cpuid_eax(1); + return (eax & 0xf0000) >> (16 - 4) | (eax & 0xf0) >> 4; +} + #endif |