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Check CPUID info, switch cpu flag to Broadwell

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This commit is contained in:
Justin C. Miller
2018-04-29 23:50:56 -07:00
parent 99222d8ab9
commit 2d4e7cfdee
4 changed files with 117 additions and 0 deletions
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63
src/kernel/cpu.cpp Normal file
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#include <stdint.h>
#include "kutil/memory.h"
#include "cpu.h"
#include "log.h"
inline static void
__cpuid(
uint32_t leaf,
uint32_t subleaf,
uint32_t *eax,
uint32_t *ebx = nullptr,
uint32_t *ecx = nullptr,
uint32_t *edx = nullptr)
{
uint32_t a, b, c, d;
__asm__ __volatile__ ( "cpuid"
: "=a"(a), "=b"(b), "=c"(c), "=d"(d)
: "a"(leaf), "c"(subleaf)
);
if (eax) *eax = a;
if (ebx) *ebx = b;
if (ecx) *ecx = c;
if (edx) *edx = d;
}
cpu_id::cpu_id()
{
__cpuid(0, 0,
&m_high_leaf,
reinterpret_cast<uint32_t *>(&m_vendor_id[0]),
reinterpret_cast<uint32_t *>(&m_vendor_id[8]),
reinterpret_cast<uint32_t *>(&m_vendor_id[4]));
uint32_t eax = 0;
__cpuid(0, 1, &eax);
m_stepping = eax & 0xf;
m_model = (eax >> 4) & 0xf;
m_family = (eax >> 8) & 0xf;
m_cpu_type = (eax >> 12) & 0x3;
uint32_t ext_model = (eax >> 16) & 0xf;
uint32_t ext_family = (eax >> 20) & 0xff;
if (m_family == 0x6 || m_family == 0xf)
m_model = (ext_model << 4) + m_model;
if (m_family == 0xf)
m_family += ext_family;
}
cpu_id::regs
cpu_id::get(uint32_t leaf, uint32_t sub) const
{
if (leaf > m_high_leaf) return {};
regs ret;
__cpuid(leaf, sub, &ret.eax, &ret.ebx, &ret.ecx, &ret.edx);
return ret;
}