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