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/*
* Dump CPUID information
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <com32.h>
#include <sys/cpu.h>
#include "sysdump.h"
#include "backend.h"
struct cpuid_data {
uint32_t eax, ebx, ecx, edx;
};
struct cpuid_info {
uint32_t eax, ecx;
struct cpuid_data data;
};
static bool has_eflag(uint32_t flag)
{
uint32_t f0, f1;
asm("pushfl ; "
"pushfl ; "
"popl %0 ; "
"movl %0,%1 ; "
"xorl %2,%1 ; "
"pushl %1 ; "
"popfl ; "
"pushfl ; "
"popl %1 ; "
"popfl"
: "=&r" (f0), "=&r" (f1)
: "ri" (flag));
return !!((f0^f1) & flag);
}
static inline void get_cpuid(uint32_t eax, uint32_t ecx,
struct cpuid_data *data)
{
asm("cpuid"
: "=a" (data->eax), "=b" (data->ebx),
"=c" (data->ecx), "=d" (data->edx)
: "a" (eax), "c" (ecx));
}
#define CPUID_CHUNK 128
void dump_cpuid(struct backend *be)
{
struct cpuid_info *buf = NULL;
int nentry, nalloc;
uint32_t region;
struct cpuid_data base_leaf;
uint32_t base, leaf, count;
struct cpuid_data invalid_leaf;
struct cpuid_data data;
if (!has_eflag(EFLAGS_ID))
return;
printf("Dumping CPUID... ");
nentry = nalloc = 0;
/* Find out what the CPU returns for invalid leaves */
get_cpuid(0, 0, &base_leaf);
get_cpuid(base_leaf.eax+1, 0, &invalid_leaf);
for (region = 0 ; region <= 0xffff ; region++) {
base = region << 16;
get_cpuid(base, 0, &base_leaf);
if (region && !memcmp(&base_leaf, &invalid_leaf, sizeof base_leaf))
continue;
if ((base_leaf.eax ^ base) & 0xffff0000)
continue;
for (leaf = base ; leaf <= base_leaf.eax ; leaf++) {
get_cpuid(leaf, 0, &data);
count = 0;
do {
if (nentry >= nalloc) {
nalloc += CPUID_CHUNK;
buf = realloc(buf, nalloc*sizeof *buf);
if (!buf)
return; /* FAILED */
}
buf[nentry].eax = leaf;
buf[nentry].ecx = count;
buf[nentry].data = data;
nentry++;
count++;
get_cpuid(leaf, count, &data);
} while (memcmp(&data, &buf[nentry-1].data, sizeof data) &&
(data.eax | data.ebx | data.ecx | data.edx));
}
}
if (nentry)
cpio_writefile(be, "cpuid", buf, nentry*sizeof *buf);
free(buf);
printf("done.\n");
}
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