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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/* Cherokee
*
* Authors:
* Alvaro Lopez Ortega <alvaro@alobbs.com>
*
* Copyright (C) 2001-2011 Alvaro Lopez Ortega
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of version 2 of the GNU General Public
* License as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
#include "common-internal.h"
#include "cacheline.h"
#if (( __GNUC__ || __INTEL_COMPILER ) && ( __i386__ || __amd64__ ))
static void
get_cpuid (uint32_t i, uint32_t *buf)
{
# if __i386__
__asm__ (
" mov %%ebx, %%esi; "
" cpuid; "
" mov %%eax, (%1); "
" mov %%ebx, 4(%1); "
" mov %%edx, 8(%1); "
" mov %%ecx, 12(%1); "
" mov %%esi, %%ebx; "
: : "a" (i), "D" (buf) : "ecx", "edx", "esi", "memory" );
# elif __amd64__
uint32_t eax, ebx, ecx, edx;
__asm__ (
"cpuid"
: "=a" (eax), "=b" (ebx), "=c" (ecx), "=d" (edx) : "a" (i) );
buf[0] = eax;
buf[1] = ebx;
buf[2] = edx;
buf[3] = ecx;
# endif
}
static ret_t
get_cache_line_live (cuint_t *size)
{
uint32_t vendor_buf[5];
uint32_t processor_buf[5];
const char *vendor;
memset (vendor_buf, 0, sizeof(vendor_buf));
memset (processor_buf, 0, sizeof(processor_buf));
/* EAX=0: Get vendor ID
*/
get_cpuid (0, vendor_buf);
vendor = (const char *)&vendor_buf[1];
if (vendor_buf[0] == 0) {
return ret_error;
}
/* EAX=1: Get Processor Info and Feature Bits
*/
get_cpuid(1, processor_buf);
if (strcmp (vendor, "GenuineIntel") == 0) {
switch ((processor_buf[0] & 0xf00) >> 8) {
case 5:
/* Pentium */
*size = 32;
return ret_ok;
case 6:
/* Pentium Pro, II, III */
*size = 32;
if ((processor_buf[0] & 0xf0) >= 0xd0) {
/* Intel Core */
*size = 64;
}
return ret_ok;
case 15:
/* Pentium 4, although its cache line size is 64 bytes,
* it prefetches up to two cache lines during memory read
*/
*size = 128;
return ret_ok;
}
} else if (strcmp(vendor, "AuthenticAMD") == 0) {
*size = 64;
return ret_ok;
}
return ret_not_found;
}
#endif // (( __GNUC__ || __INTEL_COMPILER ) && ( __i386__ || __amd64__ ))
ret_t
cherokee_cacheline_size_get (cuint_t *size)
{
#if (( __GNUC__ || __INTEL_COMPILER ) && ( __i386__ || __amd64__ ))
ret_t ret;
ret = get_cache_line_live (size);
if (ret == ret_ok) return ret_ok;
#endif
*size = CPU_CACHE_LINE;
return ret_ok;
}
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