cpu.c

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//cpu.c - cpu related functions
#include "cpu.h"
#include "../lib/types.h"
#include "../lib/utils.h"
 
//external asm functions
extern int __cpuid_supported(void);
extern void __cpuid_get_vendor(uint32_t *ebx, uint32_t *edx, uint32_t *ecx);
extern uint32_t __cpuid_get_features(void);
 
/**
 * @brief getcpu detects cpu vendor and model information
 *
 * getcpu is a function that uses the cpuid instruction to detect
 * the cpu vendor string and model information and formats it into
 * a readable string
 * @param buffer, the output buffer for the cpu description string
 * @param buffer_len, the size of the output buffer
 *
 * using getcpu is done with
 * @code{.c}
 * #include "../kernel/cpu.h" //or just cpu.h
 * char cpu[64];
 * getcpu(cpu, sizeof(cpu));
 * @endcode
 *
 * @see __cpuid_supported(), shell() info cmd
 */
void __getcpu(char *buffer, uint32_t buffer_len) {
    char num[8];
    
    if (buffer == NULL || buffer_len == 0) return;
    
    if (__cpuid_supported()) {
        uint32_t ebx, edx, ecx;
        
        __cpuid_get_vendor(&ebx, &edx, &ecx);
        
        char vendor[13];
        uint32_t *vid = (uint32_t*)vendor;
        vid[0] = ebx;
        vid[1] = edx;
        vid[2] = ecx;
        vendor[12] = '\0';
        
        uint32_t eax = __cpuid_get_features();
        uint32_t family = (eax >> 8) & 0xF;
        uint32_t model = (eax >> 4) & 0xF;
        uint32_t stepping = eax & 0xF;
        
        strcpy(buffer, vendor);
        strcat(buffer, " family ");
        itoa((int)family, num);
        strcat(buffer, num);
        strcat(buffer, " model ");
        itoa((int)model, num);
        strcat(buffer, num);
        strcat(buffer, " stepping ");
        itoa((int)stepping, num);
        strcat(buffer, num);
    } else {
        strcpy(buffer, "unknown");
    }
}