51 lines
911 B
C
51 lines
911 B
C
|
|
/*
|
|
* Routines to indentify additional cpu features that are scattered in
|
|
* cpuid space.
|
|
*/
|
|
|
|
#include <linux/cpu.h>
|
|
|
|
#include <asm/processor.h>
|
|
|
|
struct cpuid_bit {
|
|
u16 feature;
|
|
u8 reg;
|
|
u8 bit;
|
|
u32 level;
|
|
};
|
|
|
|
enum cpuid_regs {
|
|
CR_EAX = 0,
|
|
CR_ECX,
|
|
CR_EDX,
|
|
CR_EBX
|
|
};
|
|
|
|
void __cpuinit init_scattered_cpuid_features(struct cpuinfo_x86 *c)
|
|
{
|
|
u32 max_level;
|
|
u32 regs[4];
|
|
const struct cpuid_bit *cb;
|
|
|
|
static const struct cpuid_bit cpuid_bits[] = {
|
|
{ X86_FEATURE_IDA, CR_EAX, 1, 0x00000006 },
|
|
{ 0, 0, 0, 0 }
|
|
};
|
|
|
|
for (cb = cpuid_bits; cb->feature; cb++) {
|
|
|
|
/* Verify that the level is valid */
|
|
max_level = cpuid_eax(cb->level & 0xffff0000);
|
|
if (max_level < cb->level ||
|
|
max_level > (cb->level | 0xffff))
|
|
continue;
|
|
|
|
cpuid(cb->level, ®s[CR_EAX], ®s[CR_EBX],
|
|
®s[CR_ECX], ®s[CR_EDX]);
|
|
|
|
if (regs[cb->reg] & (1 << cb->bit))
|
|
set_bit(cb->feature, c->x86_capability);
|
|
}
|
|
}
|