summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
-rw-r--r--payloads/libpayload/include/x86/arch/cpuid.h32
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