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Avoid a divide by zero error on non-Core i cpus.

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Also support Linux and, why not, Android too.
This commit is contained in:
Unknown W. Brackets 2013-10-17 23:03:04 -07:00
parent 3c0772a142
commit 267bf97834
1 changed files with 49 additions and 13 deletions
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62
Common/CPUDetect.cpp
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@ -85,6 +85,43 @@ void __cpuid(int regs[4], int cpuid_leaf)
#endif
}
void __cpuidex(int regs[4], int cpuid_leaf, int ecxval)
{
#ifdef ANDROID
// Use the /dev/cpu/%i/cpuid interface
int f = open("/dev/cpu/0/cpuid", O_RDONLY);
if (f) {
lseek64(f, ((uint64_t)ecxval << 32) | cpuid_leaf, SEEK_SET);
read(f, (void *)regs, 16);
close(f);
} else {
ELOG("CPUID %08x failed!", cpuid_leaf);
}
#else
asm volatile (
#if defined(__i386__)
"pushl %%ebx;\n\t"
#endif
"movl %4, %%eax;\n\t"
"movl %5, %%ecx;\n\t"
"cpuid;\n\t"
"movl %%eax, %0;\n\t"
"movl %%ebx, %1;\n\t"
"movl %%ecx, %2;\n\t"
"movl %%edx, %3;\n\t"
#if defined(__i386__)
"popl %%ebx;\n\t"
#endif
:"=m" (regs[0]), "=m" (regs[1]), "=m" (regs[2]), "=m" (regs[3])
:"r" (cpuid_leaf), "r" (ecxval)
:"%eax",
#if !defined(__i386__)
"%ebx",
#endif
"%ecx", "%edx");
#endif
}
#endif
#endif
@ -192,22 +229,21 @@ void CPUInfo::Detect()
int apic_id_core_id_size = (cpu_id[2] >> 12) & 0xF;
if (apic_id_core_id_size == 0) {
if (ht) {
#ifdef _WIN32
// TODO: Make this work on non-Windows.
// 0x0B is the preferred method on i7(i5, i3, too? Unsure..).
// Inspired by https://github.com/D-Programming-Language/druntime/blob/master/src/core/cpuid.d#L562.
// 0x0B is the preferred method on Core i series processors.
// Inspired by https://github.com/D-Programming-Language/druntime/blob/23b0d1f41e27638bda2813af55823b502195a58d/src/core/cpuid.d#L562.
bool hasLeafB = false;
if (vendor == VENDOR_INTEL && max_std_fn >= 0x0B) {
__cpuidex(cpu_id, 0x0B, 0);
logical_cpu_count = cpu_id[1] & 0xFFFF;
__cpuidex(cpu_id, 0x0B, 1);
int totalThreads = cpu_id[1] & 0xFFFF;
num_cores = totalThreads / logical_cpu_count;
if (cpu_id[1] != 0) {
logical_cpu_count = cpu_id[1] & 0xFFFF;
__cpuidex(cpu_id, 0x0B, 1);
int totalThreads = cpu_id[1] & 0xFFFF;
num_cores = totalThreads / logical_cpu_count;
hasLeafB = true;
}
}
else if (vendor == VENDOR_INTEL) {
#else
// New mechanism for modern Intel CPUs.
if (vendor == VENDOR_INTEL) {
#endif
// Old new mechanism for modern Intel CPUs.
if (!hasLeafB && vendor == VENDOR_INTEL) {
__cpuid(cpu_id, 0x00000004);
int cores_x_package = ((cpu_id[0] >> 26) & 0x3F) + 1;
HTT = (cores_x_package < logical_cpu_count);