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#ifdef CONFIG_X86_64
#include "stdint.h"
#include "string.h"
#include "bits/cpu.h"
/* Standard macro to see if a specific flag is changeable */
static inline int flag_is_changeable_p(uint32_t flag)
{
uint32_t f1, f2;
asm("pushfl\n\t"
"pushfl\n\t"
"popl %0\n\t"
"movl %0,%1\n\t"
"xorl %2,%0\n\t"
"pushl %0\n\t"
"popfl\n\t"
"pushfl\n\t"
"popl %0\n\t"
"popfl\n\t"
: "=&r" (f1), "=&r" (f2)
: "ir" (flag));
return ((f1^f2) & flag) != 0;
}
/* Probe for the CPUID instruction */
static inline int have_cpuid_p(void)
{
return flag_is_changeable_p(X86_EFLAGS_ID);
}
static void identify_cpu(struct cpuinfo_x86 *c)
{
unsigned xlvl;
c->cpuid_level = -1; /* CPUID not detected */
c->x86_model = c->x86_mask = 0; /* So far unknown... */
c->x86_vendor_id[0] = '\0'; /* Unset */
memset(&c->x86_capability, 0, sizeof c->x86_capability);
if (!have_cpuid_p()) {
/* CPU doesn'thave CPUID */
/* If there are any capabilities, they'r vendor-specific */
/* enable_cpuid() would have set c->x86 for us. */
}
else {
/* CPU does have CPUID */
/* Get vendor name */
cpuid(0x00000000, &c->cpuid_level,
(int *)&c->x86_vendor_id[0],
(int *)&c->x86_vendor_id[8],
(int *)&c->x86_vendor_id[4]);
/* Initialize the standard set of capabilities */
/* Note that the vendor-specific code below might override */
/* Intel-defined flags: level 0x00000001 */
if ( c->cpuid_level >= 0x00000001 ) {
unsigned tfms, junk;
cpuid(0x00000001, &tfms, &junk, &junk,
&c->x86_capability[0]);
c->x86 = (tfms >> 8) & 15;
c->x86_model = (tfms >> 4) & 15;
c->x86_mask = tfms & 15;
}
/* AMD-defined flags: level 0x80000001 */
xlvl = cpuid_eax(0x80000000);
if ( (xlvl & 0xffff0000) == 0x80000000 ) {
if ( xlvl >= 0x80000001 )
c->x86_capability[1] = cpuid_edx(0x80000001);
}
}
}
struct cpuinfo_x86 cpu_info;
void cpu_setup(void)
{
identify_cpu(&cpu_info);
}
#endif /* CONFIG_X86_64 */
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