blob: 0fdf86f9c22ad8538f4f003f4dff24a48c42c4d4 [file] [log] [blame]
// X86 utility functions.
//
// Copyright (C) 2013 Kevin O'Connor <kevin@koconnor.net>
//
// This file may be distributed under the terms of the GNU LGPLv3 license.
#include "x86.h" // __cpuid
void
cpuid(u32 index, u32 *eax, u32 *ebx, u32 *ecx, u32 *edx)
{
// Check for cpu id
u32 origflags = save_flags();
restore_flags(origflags ^ F_ID);
u32 newflags = save_flags();
restore_flags(origflags);
if (((origflags ^ newflags) & F_ID) != F_ID)
// no cpuid
*eax = *ebx = *ecx = *edx = 0;
else
__cpuid(index, eax, ebx, ecx, edx);
}