cpuid.c

/*
Copyright (c) 2012, Intel Corporation

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

    * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
    * Neither the name of Intel Corporation nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

/* Written by Martin Dimitrov, Carl Strickland */
#include "cpuid.h"



void
cpuid(uint32_t eax_in, uint32_t ecx_in,
      cpuid_info_t *ci)
{
    asm (
#if defined(__LP64__)           /* 64-bit architecture */
        "cpuid;"                /* execute the cpuid instruction */
        "movl %%ebx, %[ebx];"   /* save ebx output */
#else                           /* 32-bit architecture */
        "pushl %%ebx;"          /* save ebx */
        "cpuid;"                /* execute the cpuid instruction */
        "movl %%ebx, %[ebx];"   /* save ebx output */
        "popl %%ebx;"           /* restore ebx */
#endif
        : "=a"(ci->eax), [ebx] "=r"(ci->ebx), "=c"(ci->ecx), "=d"(ci->edx)
        : "a"(eax_in), "c"(ecx_in)
    );
}

uint32_t
get_processor_signature()
{
    cpuid_info_t info;
    cpuid(0x1, 0, &info);
    return info.eax;
}

cpuid_info_t
get_processor_topology(uint32_t level)
{
    cpuid_info_t info;
    cpuid(0xb, level, &info);
    return info;
}

#if 0
#include <stdio.h>
void cast_uint_to_str(char* out, uint32_t in)
{
    int i;
    uint32_t mask = 0x000000ff;
    for (i = 0; i < 4; i++) {
        out[i] = (char)((in & (mask<<(i*8))) >> (i*8));
    }
    out[4] = '\0';
}

void get_vendor(char* vendor)
{
    cpuid_info_t c;
    char vendor1[5];
    char vendor2[5];
    char vendor3[5];
    cpuid(0, 0, &c);
    cast_uint_to_str(vendor1, c.ebx);
    cast_uint_to_str(vendor2, c.edx);
    cast_uint_to_str(vendor3, c.ecx);
    sprintf(vendor, "%s%s%s", vendor1, vendor2, vendor3);
}

void cpuid_test()
{
    char vendor[12];
    get_vendor(vendor);
    printf("%s\n", vendor);
}

int main()
{
    cpuid_test();
    uint32_t ps;
    ps = get_processor_signature();
    printf("processor signature: 0x%08x\n", ps);
}
#endif