48 lines
1.1 KiB
C
48 lines
1.1 KiB
C
/*
|
|
* @author xamidev <xamidev@riseup.net>
|
|
* @brief x86 CPU identification
|
|
* @license GPL-3.0-only
|
|
*/
|
|
|
|
#include <stdint.h>
|
|
#include <stddef.h>
|
|
#include <kernel.h>
|
|
#include <string/string.h>
|
|
|
|
/*
|
|
* cpuid - Wrapper for CPUID instruction
|
|
* @leaf: Requested leaf (input EAX)
|
|
* @eax: EAX register value (output)
|
|
* @ebx: EBX register value (output)
|
|
* @ecx: ECX register value (output)
|
|
* @edx: EDX register value (output)
|
|
*/
|
|
void cpuid(uint32_t leaf, uint32_t* eax, uint32_t* ebx, uint32_t* ecx, uint32_t* edx)
|
|
{
|
|
__asm__ volatile("cpuid" : "=a"(*eax), "=b"(*ebx), "=c"(*ecx), "=d"(*edx) : "a"(leaf));
|
|
}
|
|
|
|
/*
|
|
* cpuid_get_vendor_string - Get the CPU vendor string
|
|
* @str: String at least 13 bytes long (for output)
|
|
*
|
|
* Return:
|
|
* %0 - on success
|
|
*/
|
|
int cpuid_get_vendor_string(char* str)
|
|
{
|
|
uint32_t eax, ebx, ecx, edx;
|
|
|
|
cpuid(0, &eax, &ebx, &ecx, &edx);
|
|
char output[13] = {0};
|
|
|
|
uint32_t regs[3] = {ebx, edx, ecx};
|
|
for (unsigned int j=0; j<3; j++) {
|
|
for (unsigned int i=0; i<4; i++) {
|
|
output[4*j+i] = (char)((regs[j] >> 8*i) & 0xff);
|
|
}
|
|
}
|
|
|
|
strncpy(str, output, 13);
|
|
return 0;
|
|
} |