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Add cpu functions to query Processor Brand String

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This commit is contained in:
Alberto Ortega 2015-08-28 23:12:07 +02:00
parent 89cf87ead9
commit 94dca540db
2 changed files with 40 additions and 2 deletions
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41
pafish/cpu.c
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@ -2,6 +2,7 @@
#include <windows.h>
#include <stdio.h>
#include <string.h>
#include <stdint.h>
#include "types.h"
#include "cpu.h"
@ -34,8 +35,8 @@ static inline void cpuid_vendor_00(char * vendor) {
__asm__ volatile("cpuid" \
: "=b"(ebx), \
"=c"(ecx), \
"=d"(edx) \
"=c"(ecx), \
"=d"(edx) \
: "a"(0x00));
sprintf(vendor , "%c%c%c%c", ebx, (ebx >> 8), (ebx >> 16), (ebx >> 24));
sprintf(vendor+4, "%c%c%c%c", edx, (edx >> 8), (edx >> 16), (edx >> 24));
@ -43,6 +44,21 @@ static inline void cpuid_vendor_00(char * vendor) {
vendor[12] = 0x00;
}
static inline void cpuid_brand(char * brand, uint32_t eax_value) {
int eax, ebx, ecx, edx;
__asm__ volatile("cpuid" \
: "=a"(eax), \
"=b"(ebx), \
"=c"(ecx), \
"=d"(edx) \
: "a"(eax_value));
sprintf(brand , "%c%c%c%c", eax, (eax >> 8), (eax >> 16), (eax >> 24));
sprintf(brand+4 , "%c%c%c%c", ebx, (ebx >> 8), (ebx >> 16), (ebx >> 24));
sprintf(brand+8 , "%c%c%c%c", ecx, (ecx >> 8), (ecx >> 16), (ecx >> 24));
sprintf(brand+12, "%c%c%c%c", edx, (edx >> 8), (edx >> 16), (edx >> 24));
}
static inline int cpuid_hv_bit() {
int ecx;
__asm__ volatile("cpuid" \
@ -81,6 +97,27 @@ void cpu_write_vendor(char * vendor) {
cpuid_vendor_00(vendor);
}
void cpu_write_brand(char * brand) {
int eax;
/* Check if Processor Brand String is supported */
__asm__ volatile(".intel_syntax noprefix;"
"mov eax, 0x80000000;"
"cpuid;"
"cmp eax, 0x80000004;"
"xor eax, eax;"
"setge al;"
".att_syntax;"
: "=a"(eax)
);
/* It's supported, so fill char * brand */
if (eax) {
cpuid_brand(brand, 0x80000002);
cpuid_brand(brand+16, 0x80000003);
cpuid_brand(brand+32, 0x80000004);
brand[48] = 0x00;
}
}
int cpu_known_vm_vendors(char * vendor) {
const int count = 4;
int i;

1
pafish/cpu.h
View File

@ -9,6 +9,7 @@ int cpu_rdtsc_force_vmexit();
int cpu_hv();
void cpu_write_vendor(char *);
void cpu_write_brand(char *);
int cpu_known_vm_vendors(char *);