GNUBoot
/
coreboot-kgpe-d16
2
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

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>
This commit is contained in:
Nico Huber 2020-10-11 22:32:58 +02:00 committed by Angel Pons
parent b53858bace
commit d32bb116f0
1 changed files with 32 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

32
payloads/libpayload/include/x86/arch/cpuid.h
View File

@ -32,4 +32,36 @@
#define cpuid(fn, eax, ebx, ecx, edx) \ #define cpuid(fn, eax, ebx, ecx, edx) \
asm("cpuid" : "=a"(eax), "=b"(ebx), "=c"(ecx), "=d"(edx) : "0"(fn)) 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 #endif