src/cpu/cpu.cc


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#include "cpu.h"
#include <stdlib.h>

static_assert(sizeof(CPU::features_t) == 2 * sizeof(uint32_t));

CPU::CPU() {
  static_assert(sizeof(CPU::version_t) == sizeof(uint32_t));
  struct {
    uint32_t d;
    uint32_t c;
    uint32_t b;
    uint32_t a;
  } __attribute__((packed)) r;
  size_t highest_param = 0;

  for (int i = 0; i <= highest_param; ++i) {
    asm volatile("cpuid" : "=a"(r.a), "=b"(r.b), "=c"(r.c), "=d"(r.d) : "a"(i));

    switch (i) {
      case 0:
        highest_param = static_cast<size_t>(r.a);
        memcpy(&m_manufacturer[0], &r.b, sizeof(r.b));
        memcpy(&m_manufacturer[4], &r.d, sizeof(r.d));
        memcpy(&m_manufacturer[8], &r.c, sizeof(r.c));
        break;
      case 1:
        memcpy(&m_info, &r.a, sizeof(r.a));
        memcpy(&m_features, &r.d, sizeof(CPU::features_t));
        break;
      default:
        return;
    }
  }

}