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/* $OpenBSD: cpuprobe.c,v 1.2 2014/03/29 18:09:29 guenther Exp $ */
/*
* Copyright (c) 2004 Tom Cosgrove <tom.cosgrove@arches-consulting.com>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <machine/psl.h>
#include <machine/specialreg.h>
#include "libsa.h"
int amd64_supported;
static int cpu_family, cpu_model, cpu_stepping;
static int psl_check;
static u_int32_t feature_ecx, feature_edx, feature_amd;
static char cpu_brandstr[48]; /* Includes term NUL byte */
static char cpu_vendor[13]; /* 12 chars plus NUL term */
/*
* cpuid instruction. request in eax, result in eax, ebx, ecx, edx.
* requires caller to provide u_int32_t regs[4] array.
*/
u_int32_t
cpuid(u_int32_t eax, u_int32_t *regs)
{
__asm volatile(
"cpuid\n\t"
"movl %%eax, 0(%2)\n\t"
"movl %%ebx, 4(%2)\n\t"
"movl %%ecx, 8(%2)\n\t"
"movl %%edx, 12(%2)\n\t"
: "=a" (eax)
: "0" (eax), "S" (regs)
: "bx", "cx", "dx");
return eax;
}
void
cpuprobe(void)
{
u_int32_t cpuid_max, extended_max;
u_int32_t regs[4];
/*
* The following is a simple check to see if cpuid is supported.
* We try to toggle bit 21 (PSL_ID) in eflags. If it works, then
* cpuid is supported. If not, there's no cpuid, and we don't
* try it (don't want /boot to get an invalid opcode exception).
*
* XXX The NexGen Nx586 does not support this bit, so this is not
* a good method to detect the presence of cpuid on this
* processor. That's fine: the purpose here is to detect the
* absence of cpuid. We don't mind if the instruction's not
* there - this is not intended to determine exactly what
* processor is there, just whether it's i386 or amd64.
*
* The only thing that would cause us grief is a processor which
* does not support cpuid but which does allow the PSL_ID bit
* in eflags to be toggled.
*/
__asm volatile(
"pushfl\n\t"
"popl %2\n\t"
"xorl %2, %0\n\t"
"pushl %0\n\t"
"popfl\n\t"
"pushfl\n\t"
"popl %0\n\t"
"xorl %2, %0\n\t" /* If %2 == %0, no cpuid */
: "=r" (psl_check)
: "0" (PSL_ID), "r" (0)
: "cc");
if (psl_check == PSL_ID) { /* cpuid supported */
cpuid_max = cpuid(0, regs); /* Highest std call */
bcopy(®s[1], cpu_vendor, sizeof(regs[1]));
bcopy(®s[3], cpu_vendor + 4, sizeof(regs[3]));
bcopy(®s[2], cpu_vendor + 8, sizeof(regs[2]));
cpu_vendor[sizeof(cpu_vendor) - 1] = '\0';
if (cpuid_max >= 1) {
u_int32_t id;
id = cpuid(1, regs); /* Get basic info */
cpu_stepping = id & 0x000000f;
cpu_model = (id >> 4) & 0x0000000f;
cpu_family = (id >> 8) & 0x0000000f;
feature_ecx = regs[2];
feature_edx = regs[3];
}
extended_max = cpuid(0x80000000, regs); /* Highest ext */
if (extended_max >= 0x80000001) {
cpuid(0x80000001, regs);
feature_amd = regs[3];
if (feature_amd & CPUID_LONG)
amd64_supported = 1;
}
cpu_brandstr[0] = '\0';
if (extended_max >= 0x80000004) {
u_int32_t brand_ints[12];
cpuid(0x80000002, brand_ints);
cpuid(0x80000003, brand_ints + 4);
cpuid(0x80000004, brand_ints + 8);
bcopy(brand_ints, cpu_brandstr,
sizeof(cpu_brandstr) - 1);
cpu_brandstr[sizeof(cpu_brandstr) - 1] = '\0';
}
}
printf("%s", amd64_supported ? " amd64" : " i386");
}
void
dump_cpuinfo(void)
{
printf("\"%s\", family %d, model %d, step %d\n",
cpu_vendor, cpu_family, cpu_model, cpu_stepping);
if (*cpu_brandstr)
printf("%s\n", cpu_brandstr);
printf("features: ecx 0x%x, edx 0x%x, amd 0x%x\n",
feature_ecx, feature_edx, feature_amd);
printf("psl_check: 0x%x\n", psl_check);
}
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