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/*
* $Id: features.c,v 1.6 2001/06/16 01:46:07 davej Exp $
* This file is part of x86info
* (C) 2001 Dave Jones.
*
* Licensed under the terms of the GNU GPL License version 2.
*
* Feature flag decoding.
* Modified from a routine in Linux kernel 2.4.0test3 by Jauder Ho <jauderho@carumba.com>
* FIXME: Update to latest code from 2.4 kernel.
*/
#include <stdio.h>
#include "x86info.h"
extern struct cpudata *cpu;
extern int show_flags;
void decode_feature_flags (struct cpudata *cpu, int flags)
{
/*
* Flags should be entered into the array ONLY if there is no overlap.
* Else a number should be used and then overridden in the case
* statement below. --Jauder <jauderho@carumba.com>
*
* NOTE: bits 10, 19-22, 26-31 are reserved.
*
* Data courtesy of http://www.sandpile.org/arch/cpuid.htm
* Thanks to the Greasel!
*/
static char *cap_flags[] = {
"fpu", "vme", "de", "pse", "tsc", "msr", "pae", "mce",
"cx8", "apic", "10", "sep", "mtrr", "pge", "mca", "cmov",
"16", "pse36", "psn", "19", "20", "21", "22", "mmx",
"24", "xmm", "26", "27", "28", "29", "30", "31"
};
int i;
if (show_flags == 0)
return;
printf ("Feature flags:\n");
/* Modify the capabilities according to chip type */
switch (cpu->vendor) {
case VENDOR_CYRIX:
cap_flags[24] = "cxmmx";
break;
case VENDOR_AMD:
if (cpu->family == 5 && cpu->model == 6)
cap_flags[10] = "sep";
if (cpu->family < 6)
cap_flags[16] = "fcmov";
cap_flags[16] = "pat";
cap_flags[22] = "mmxext";
cap_flags[24] = "fxsr";
if (cpu->family >=6 && cpu->model >= 6)
cap_flags[25] = "sse";
cap_flags[30] = "3dnowext";
cap_flags[31] = "3dnow";
break;
case VENDOR_INTEL:
cap_flags[16] = "pat";
cap_flags[18] = "pn";
cap_flags[24] = "fxsr";
cap_flags[25] = "sse";
cap_flags[26] = "sse2";
cap_flags[27] = "ss";
cap_flags[29] = "tm";
cap_flags[30] = "ia64";
break;
case VENDOR_CENTAUR:
if (cpu->model >= 8) /* Only Winchip2 and above */
cap_flags[31] = "3dnow";
break;
default:
/* Unknown CPU manufacturer or no special handling needed */
break;
}
for (i = 0; i < 32; i++)
if (flags & (1 << i))
printf (" %s", cap_flags[i]);
printf ("\n\n");
}
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