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minor improvements

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This was SVN commit r1974.
This commit is contained in:
janwas 2005-03-09 12:57:52 +00:00
parent 5b3d4a196c
commit db1a6ddf38
1 changed files with 14 additions and 5 deletions
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19
source/lib/sysdep/ia32.cpp
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@ -135,11 +135,18 @@ enum Regs
EDX
};
enum MiscCpuCapBits
{
// AMD PowerNow! flags (returned in edx by CPUID 0x80000007)
POWERNOW_FREQ_ID_CTRL = 2
};
static bool cpuid(u32 func, u32* regs)
{
if(func > max_ext_func)
return false;
// (optimized for size)
__asm
{
mov eax, [func]
@ -498,14 +505,16 @@ static void check_smp()
static void check_speedstep()
{
if(vendor == INTEL && ia32_cap(EST))
cpu_speedstep = 1;
if(vendor == AMD)
if(vendor == INTEL)
{
if(ia32_cap(EST))
cpu_speedstep = 1;
}
else if(vendor == AMD)
{
u32 regs[4];
if(cpuid(0x80000007, regs))
if(regs[EDX] & 2) // frequency ID control
if(regs[EDX] & POWERNOW_FREQ_ID_CTRL)
cpu_speedstep = 1;
}
}