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gecko/security/nss/lib/freebl/mpi/mpcpucache.c
Kai Engert 2b43284096 Bug 486182, Land NSS 3.12.3 final in mozilla-central 
r=nelson
2009-04-07 03:36:45 +02:00

839 lines
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/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is the Netscape security libraries.
*
* The Initial Developer of the Original Code is
* Red Hat, Inc
* Portions created by the Initial Developer are Copyright (C) 2005
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Robert Relyea <rrelyea@redhat.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "mpi.h"
/*
* This file implements a single function: s_mpi_getProcessorLineSize();
* s_mpi_getProcessorLineSize() returns the size in bytes of the cache line
* if a cache exists, or zero if there is no cache. If more than one
* cache line exists, it should return the smallest line size (which is
* usually the L1 cache).
*
* mp_modexp uses this information to make sure that private key information
* isn't being leaked through the cache.
*
* Currently the file returns good data for most modern x86 processors, and
* reasonable data on 64-bit ppc processors. All other processors are assumed
* to have a cache line size of 32 bytes unless modified by target.mk.
*
*/
#if defined(i386) || defined(__i386) || defined(__X86__) || defined (_M_IX86) || defined(__x86_64__) || defined(__x86_64) || defined(_M_AMD64)
/* X86 processors have special instructions that tell us about the cache */
#include "string.h"
#if defined(__x86_64__) || defined(__x86_64) || defined(_M_AMD64)
#define AMD_64 1
#endif
/* Generic CPUID function */
#if defined(AMD_64)
#if defined(__GNUC__)
void freebl_cpuid(unsigned long op, unsigned long *eax,
unsigned long *ebx, unsigned long *ecx,
unsigned long *edx)
{
__asm__("cpuid\n\t"
: "=a" (*eax),
"=b" (*ebx),
"=c" (*ecx),
"=d" (*edx)
: "0" (op));
}
#elif defined(_MSC_VER)
#include <intrin.h>
void freebl_cpuid(unsigned long op, unsigned long *eax,
unsigned long *ebx, unsigned long *ecx,
unsigned long *edx)
{
int intrinsic_out[4];
__cpuid(intrinsic_out, op);
*eax = intrinsic_out[0];
*ebx = intrinsic_out[1];
*ecx = intrinsic_out[2];
*edx = intrinsic_out[3];
}
#endif
#else /* !defined(AMD_64) */
/* x86 */
#if defined(__GNUC__)
void freebl_cpuid(unsigned long op, unsigned long *eax,
unsigned long *ebx, unsigned long *ecx,
unsigned long *edx)
{
/* sigh GCC isn't smart enough to save the ebx PIC register on it's own
* in this case, so do it by hand. */
__asm__("pushl %%ebx\n\t"
"cpuid\n\t"
"mov %%ebx,%1\n\t"
"popl %%ebx\n\t"
: "=a" (*eax),
"=r" (*ebx),
"=c" (*ecx),
"=d" (*edx)
: "0" (op));
}
/*
* try flipping a processor flag to determine CPU type
*/
static unsigned long changeFlag(unsigned long flag)
{
unsigned long changedFlags, originalFlags;
__asm__("pushfl\n\t" /* get the flags */
"popl %0\n\t"
"movl %0,%1\n\t" /* save the original flags */
"xorl %2,%0\n\t" /* flip the bit */
"pushl %0\n\t" /* set the flags */
"popfl\n\t"
"pushfl\n\t" /* get the flags again (for return) */
"popl %0\n\t"
"pushl %1\n\t" /* restore the original flags */
"popfl\n\t"
: "=r" (changedFlags),
"=r" (originalFlags),
"=r" (flag)
: "2" (flag));
return changedFlags ^ originalFlags;
}
#elif defined(_MSC_VER)
/*
* windows versions of the above assembler
*/
#define wcpuid __asm __emit 0fh __asm __emit 0a2h
void freebl_cpuid(unsigned long op, unsigned long *Reax,
unsigned long *Rebx, unsigned long *Recx, unsigned long *Redx)
{
unsigned long Leax, Lebx, Lecx, Ledx;
__asm {
pushad
mov eax,op
wcpuid
mov Leax,eax
mov Lebx,ebx
mov Lecx,ecx
mov Ledx,edx
popad
}
*Reax = Leax;
*Rebx = Lebx;
*Recx = Lecx;
*Redx = Ledx;
}
static unsigned long changeFlag(unsigned long flag)
{
unsigned long changedFlags, originalFlags;
__asm {
push eax
push ebx
pushfd /* get the flags */
pop eax
push eax /* save the flags on the stack */
mov originalFlags,eax /* save the original flags */
mov ebx,flag
xor eax,ebx /* flip the bit */
push eax /* set the flags */
popfd
pushfd /* get the flags again (for return) */
pop eax
popfd /* restore the original flags */
mov changedFlags,eax
pop ebx
pop eax
}
return changedFlags ^ originalFlags;
}
#endif
#endif
#if !defined(AMD_64)
#define AC_FLAG 0x40000
#define ID_FLAG 0x200000
/* 386 processors can't flip the AC_FLAG, intel AP Note AP-485 */
static int is386()
{
return changeFlag(AC_FLAG) == 0;
}
/* 486 processors can't flip the ID_FLAG, intel AP Note AP-485 */
static int is486()
{
return changeFlag(ID_FLAG) == 0;
}
#endif
/*
* table for Intel Cache.
* See Intel Application Note AP-485 for more information
*/
typedef unsigned char CacheTypeEntry;
typedef enum {
Cache_NONE = 0,
Cache_UNKNOWN = 1,
Cache_TLB = 2,
Cache_TLBi = 3,
Cache_TLBd = 4,
Cache_Trace = 5,
Cache_L1 = 6,
Cache_L1i = 7,
Cache_L1d = 8,
Cache_L2 = 9 ,
Cache_L2i = 10 ,
Cache_L2d = 11 ,
Cache_L3 = 12 ,
Cache_L3i = 13,
Cache_L3d = 14
} CacheType;
struct _cache {
CacheTypeEntry type;
unsigned char lineSize;
};
static const struct _cache CacheMap[256] = {
/* 00 */ {Cache_NONE, 0 },
/* 01 */ {Cache_TLBi, 0 },
/* 02 */ {Cache_TLBi, 0 },
/* 03 */ {Cache_TLBd, 0 },
/* 04 */ {Cache_TLBd, },
/* 05 */ {Cache_UNKNOWN, 0 },
/* 06 */ {Cache_L1i, 32 },
/* 07 */ {Cache_UNKNOWN, 0 },
/* 08 */ {Cache_L1i, 32 },
/* 09 */ {Cache_UNKNOWN, 0 },
/* 0a */ {Cache_L1d, 32 },
/* 0b */ {Cache_UNKNOWN, 0 },
/* 0c */ {Cache_L1d, 32 },
/* 0d */ {Cache_UNKNOWN, 0 },
/* 0e */ {Cache_UNKNOWN, 0 },
/* 0f */ {Cache_UNKNOWN, 0 },
/* 10 */ {Cache_UNKNOWN, 0 },
/* 11 */ {Cache_UNKNOWN, 0 },
/* 12 */ {Cache_UNKNOWN, 0 },
/* 13 */ {Cache_UNKNOWN, 0 },
/* 14 */ {Cache_UNKNOWN, 0 },
/* 15 */ {Cache_UNKNOWN, 0 },
/* 16 */ {Cache_UNKNOWN, 0 },
/* 17 */ {Cache_UNKNOWN, 0 },
/* 18 */ {Cache_UNKNOWN, 0 },
/* 19 */ {Cache_UNKNOWN, 0 },
/* 1a */ {Cache_UNKNOWN, 0 },
/* 1b */ {Cache_UNKNOWN, 0 },
/* 1c */ {Cache_UNKNOWN, 0 },
/* 1d */ {Cache_UNKNOWN, 0 },
/* 1e */ {Cache_UNKNOWN, 0 },
/* 1f */ {Cache_UNKNOWN, 0 },
/* 20 */ {Cache_UNKNOWN, 0 },
/* 21 */ {Cache_UNKNOWN, 0 },
/* 22 */ {Cache_L3, 64 },
/* 23 */ {Cache_L3, 64 },
/* 24 */ {Cache_UNKNOWN, 0 },
/* 25 */ {Cache_L3, 64 },
/* 26 */ {Cache_UNKNOWN, 0 },
/* 27 */ {Cache_UNKNOWN, 0 },
/* 28 */ {Cache_UNKNOWN, 0 },
/* 29 */ {Cache_L3, 64 },
/* 2a */ {Cache_UNKNOWN, 0 },
/* 2b */ {Cache_UNKNOWN, 0 },
/* 2c */ {Cache_L1d, 64 },
/* 2d */ {Cache_UNKNOWN, 0 },
/* 2e */ {Cache_UNKNOWN, 0 },
/* 2f */ {Cache_UNKNOWN, 0 },
/* 30 */ {Cache_L1i, 64 },
/* 31 */ {Cache_UNKNOWN, 0 },
/* 32 */ {Cache_UNKNOWN, 0 },
/* 33 */ {Cache_UNKNOWN, 0 },
/* 34 */ {Cache_UNKNOWN, 0 },
/* 35 */ {Cache_UNKNOWN, 0 },
/* 36 */ {Cache_UNKNOWN, 0 },
/* 37 */ {Cache_UNKNOWN, 0 },
/* 38 */ {Cache_UNKNOWN, 0 },
/* 39 */ {Cache_L2, 64 },
/* 3a */ {Cache_UNKNOWN, 0 },
/* 3b */ {Cache_L2, 64 },
/* 3c */ {Cache_L2, 64 },
/* 3d */ {Cache_UNKNOWN, 0 },
/* 3e */ {Cache_UNKNOWN, 0 },
/* 3f */ {Cache_UNKNOWN, 0 },
/* 40 */ {Cache_L2, 0 },
/* 41 */ {Cache_L2, 32 },
/* 42 */ {Cache_L2, 32 },
/* 43 */ {Cache_L2, 32 },
/* 44 */ {Cache_L2, 32 },
/* 45 */ {Cache_L2, 32 },
/* 46 */ {Cache_UNKNOWN, 0 },
/* 47 */ {Cache_UNKNOWN, 0 },
/* 48 */ {Cache_UNKNOWN, 0 },
/* 49 */ {Cache_UNKNOWN, 0 },
/* 4a */ {Cache_UNKNOWN, 0 },
/* 4b */ {Cache_UNKNOWN, 0 },
/* 4c */ {Cache_UNKNOWN, 0 },
/* 4d */ {Cache_UNKNOWN, 0 },
/* 4e */ {Cache_UNKNOWN, 0 },
/* 4f */ {Cache_UNKNOWN, 0 },
/* 50 */ {Cache_TLBi, 0 },
/* 51 */ {Cache_TLBi, 0 },
/* 52 */ {Cache_TLBi, 0 },
/* 53 */ {Cache_UNKNOWN, 0 },
/* 54 */ {Cache_UNKNOWN, 0 },
/* 55 */ {Cache_UNKNOWN, 0 },
/* 56 */ {Cache_UNKNOWN, 0 },
/* 57 */ {Cache_UNKNOWN, 0 },
/* 58 */ {Cache_UNKNOWN, 0 },
/* 59 */ {Cache_UNKNOWN, 0 },
/* 5a */ {Cache_UNKNOWN, 0 },
/* 5b */ {Cache_TLBd, 0 },
/* 5c */ {Cache_TLBd, 0 },
/* 5d */ {Cache_TLBd, 0 },
/* 5e */ {Cache_UNKNOWN, 0 },
/* 5f */ {Cache_UNKNOWN, 0 },
/* 60 */ {Cache_UNKNOWN, 0 },
/* 61 */ {Cache_UNKNOWN, 0 },
/* 62 */ {Cache_UNKNOWN, 0 },
/* 63 */ {Cache_UNKNOWN, 0 },
/* 64 */ {Cache_UNKNOWN, 0 },
/* 65 */ {Cache_UNKNOWN, 0 },
/* 66 */ {Cache_L1d, 64 },
/* 67 */ {Cache_L1d, 64 },
/* 68 */ {Cache_L1d, 64 },
/* 69 */ {Cache_UNKNOWN, 0 },
/* 6a */ {Cache_UNKNOWN, 0 },
/* 6b */ {Cache_UNKNOWN, 0 },
/* 6c */ {Cache_UNKNOWN, 0 },
/* 6d */ {Cache_UNKNOWN, 0 },
/* 6e */ {Cache_UNKNOWN, 0 },
/* 6f */ {Cache_UNKNOWN, 0 },
/* 70 */ {Cache_Trace, 1 },
/* 71 */ {Cache_Trace, 1 },
/* 72 */ {Cache_Trace, 1 },
/* 73 */ {Cache_UNKNOWN, 0 },
/* 74 */ {Cache_UNKNOWN, 0 },
/* 75 */ {Cache_UNKNOWN, 0 },
/* 76 */ {Cache_UNKNOWN, 0 },
/* 77 */ {Cache_UNKNOWN, 0 },
/* 78 */ {Cache_UNKNOWN, 0 },
/* 79 */ {Cache_L2, 64 },
/* 7a */ {Cache_L2, 64 },
/* 7b */ {Cache_L2, 64 },
/* 7c */ {Cache_L2, 64 },
/* 7d */ {Cache_UNKNOWN, 0 },
/* 7e */ {Cache_UNKNOWN, 0 },
/* 7f */ {Cache_UNKNOWN, 0 },
/* 80 */ {Cache_UNKNOWN, 0 },
/* 81 */ {Cache_UNKNOWN, 0 },
/* 82 */ {Cache_L2, 32 },
/* 83 */ {Cache_L2, 32 },
/* 84 */ {Cache_L2, 32 },
/* 85 */ {Cache_L2, 32 },
/* 86 */ {Cache_L2, 64 },
/* 87 */ {Cache_L2, 64 },
/* 88 */ {Cache_UNKNOWN, 0 },
/* 89 */ {Cache_UNKNOWN, 0 },
/* 8a */ {Cache_UNKNOWN, 0 },
/* 8b */ {Cache_UNKNOWN, 0 },
/* 8c */ {Cache_UNKNOWN, 0 },
/* 8d */ {Cache_UNKNOWN, 0 },
/* 8e */ {Cache_UNKNOWN, 0 },
/* 8f */ {Cache_UNKNOWN, 0 },
/* 90 */ {Cache_UNKNOWN, 0 },
/* 91 */ {Cache_UNKNOWN, 0 },
/* 92 */ {Cache_UNKNOWN, 0 },
/* 93 */ {Cache_UNKNOWN, 0 },
/* 94 */ {Cache_UNKNOWN, 0 },
/* 95 */ {Cache_UNKNOWN, 0 },
/* 96 */ {Cache_UNKNOWN, 0 },
/* 97 */ {Cache_UNKNOWN, 0 },
/* 98 */ {Cache_UNKNOWN, 0 },
/* 99 */ {Cache_UNKNOWN, 0 },
/* 9a */ {Cache_UNKNOWN, 0 },
/* 9b */ {Cache_UNKNOWN, 0 },
/* 9c */ {Cache_UNKNOWN, 0 },
/* 9d */ {Cache_UNKNOWN, 0 },
/* 9e */ {Cache_UNKNOWN, 0 },
/* 9f */ {Cache_UNKNOWN, 0 },
/* a0 */ {Cache_UNKNOWN, 0 },
/* a1 */ {Cache_UNKNOWN, 0 },
/* a2 */ {Cache_UNKNOWN, 0 },
/* a3 */ {Cache_UNKNOWN, 0 },
/* a4 */ {Cache_UNKNOWN, 0 },
/* a5 */ {Cache_UNKNOWN, 0 },
/* a6 */ {Cache_UNKNOWN, 0 },
/* a7 */ {Cache_UNKNOWN, 0 },
/* a8 */ {Cache_UNKNOWN, 0 },
/* a9 */ {Cache_UNKNOWN, 0 },
/* aa */ {Cache_UNKNOWN, 0 },
/* ab */ {Cache_UNKNOWN, 0 },
/* ac */ {Cache_UNKNOWN, 0 },
/* ad */ {Cache_UNKNOWN, 0 },
/* ae */ {Cache_UNKNOWN, 0 },
/* af */ {Cache_UNKNOWN, 0 },
/* b0 */ {Cache_TLBi, 0 },
/* b1 */ {Cache_UNKNOWN, 0 },
/* b2 */ {Cache_UNKNOWN, 0 },
/* b3 */ {Cache_TLBd, 0 },
/* b4 */ {Cache_UNKNOWN, 0 },
/* b5 */ {Cache_UNKNOWN, 0 },
/* b6 */ {Cache_UNKNOWN, 0 },
/* b7 */ {Cache_UNKNOWN, 0 },
/* b8 */ {Cache_UNKNOWN, 0 },
/* b9 */ {Cache_UNKNOWN, 0 },
/* ba */ {Cache_UNKNOWN, 0 },
/* bb */ {Cache_UNKNOWN, 0 },
/* bc */ {Cache_UNKNOWN, 0 },
/* bd */ {Cache_UNKNOWN, 0 },
/* be */ {Cache_UNKNOWN, 0 },
/* bf */ {Cache_UNKNOWN, 0 },
/* c0 */ {Cache_UNKNOWN, 0 },
/* c1 */ {Cache_UNKNOWN, 0 },
/* c2 */ {Cache_UNKNOWN, 0 },
/* c3 */ {Cache_UNKNOWN, 0 },
/* c4 */ {Cache_UNKNOWN, 0 },
/* c5 */ {Cache_UNKNOWN, 0 },
/* c6 */ {Cache_UNKNOWN, 0 },
/* c7 */ {Cache_UNKNOWN, 0 },
/* c8 */ {Cache_UNKNOWN, 0 },
/* c9 */ {Cache_UNKNOWN, 0 },
/* ca */ {Cache_UNKNOWN, 0 },
/* cb */ {Cache_UNKNOWN, 0 },
/* cc */ {Cache_UNKNOWN, 0 },
/* cd */ {Cache_UNKNOWN, 0 },
/* ce */ {Cache_UNKNOWN, 0 },
/* cf */ {Cache_UNKNOWN, 0 },
/* d0 */ {Cache_UNKNOWN, 0 },
/* d1 */ {Cache_UNKNOWN, 0 },
/* d2 */ {Cache_UNKNOWN, 0 },
/* d3 */ {Cache_UNKNOWN, 0 },
/* d4 */ {Cache_UNKNOWN, 0 },
/* d5 */ {Cache_UNKNOWN, 0 },
/* d6 */ {Cache_UNKNOWN, 0 },
/* d7 */ {Cache_UNKNOWN, 0 },
/* d8 */ {Cache_UNKNOWN, 0 },
/* d9 */ {Cache_UNKNOWN, 0 },
/* da */ {Cache_UNKNOWN, 0 },
/* db */ {Cache_UNKNOWN, 0 },
/* dc */ {Cache_UNKNOWN, 0 },
/* dd */ {Cache_UNKNOWN, 0 },
/* de */ {Cache_UNKNOWN, 0 },
/* df */ {Cache_UNKNOWN, 0 },
/* e0 */ {Cache_UNKNOWN, 0 },
/* e1 */ {Cache_UNKNOWN, 0 },
/* e2 */ {Cache_UNKNOWN, 0 },
/* e3 */ {Cache_UNKNOWN, 0 },
/* e4 */ {Cache_UNKNOWN, 0 },
/* e5 */ {Cache_UNKNOWN, 0 },
/* e6 */ {Cache_UNKNOWN, 0 },
/* e7 */ {Cache_UNKNOWN, 0 },
/* e8 */ {Cache_UNKNOWN, 0 },
/* e9 */ {Cache_UNKNOWN, 0 },
/* ea */ {Cache_UNKNOWN, 0 },
/* eb */ {Cache_UNKNOWN, 0 },
/* ec */ {Cache_UNKNOWN, 0 },
/* ed */ {Cache_UNKNOWN, 0 },
/* ee */ {Cache_UNKNOWN, 0 },
/* ef */ {Cache_UNKNOWN, 0 },
/* f0 */ {Cache_UNKNOWN, 0 },
/* f1 */ {Cache_UNKNOWN, 0 },
/* f2 */ {Cache_UNKNOWN, 0 },
/* f3 */ {Cache_UNKNOWN, 0 },
/* f4 */ {Cache_UNKNOWN, 0 },
/* f5 */ {Cache_UNKNOWN, 0 },
/* f6 */ {Cache_UNKNOWN, 0 },
/* f7 */ {Cache_UNKNOWN, 0 },
/* f8 */ {Cache_UNKNOWN, 0 },
/* f9 */ {Cache_UNKNOWN, 0 },
/* fa */ {Cache_UNKNOWN, 0 },
/* fb */ {Cache_UNKNOWN, 0 },
/* fc */ {Cache_UNKNOWN, 0 },
/* fd */ {Cache_UNKNOWN, 0 },
/* fe */ {Cache_UNKNOWN, 0 },
/* ff */ {Cache_UNKNOWN, 0 }
};
/*
* use the above table to determine the CacheEntryLineSize.
*/
static void
getIntelCacheEntryLineSize(unsigned long val, int *level,
unsigned long *lineSize)
{
CacheType type;
type = CacheMap[val].type;
/* only interested in data caches */
/* NOTE val = 0x40 is a special value that means no L2 or L3 cache.
* this data check has the side effect of rejecting that entry. If
* that wasn't the case, we could have to reject it explicitly */
if (CacheMap[val].lineSize == 0) {
return;
}
/* look at the caches, skip types we aren't interested in.
* if we already have a value for a lower level cache, skip the
* current entry */
if ((type == Cache_L1)|| (type == Cache_L1d)) {
*level = 1;
*lineSize = CacheMap[val].lineSize;
} else if ((*level >= 2) && ((type == Cache_L2) || (type == Cache_L2d))) {
*level = 2;
*lineSize = CacheMap[val].lineSize;
} else if ((*level >= 3) && ((type == Cache_L3) || (type == Cache_L3d))) {
*level = 3;
*lineSize = CacheMap[val].lineSize;
}
return;
}
static void
getIntelRegisterCacheLineSize(unsigned long val,
int *level, unsigned long *lineSize)
{
getIntelCacheEntryLineSize(val >> 24 & 0xff, level, lineSize);
getIntelCacheEntryLineSize(val >> 16 & 0xff, level, lineSize);
getIntelCacheEntryLineSize(val >> 8 & 0xff, level, lineSize);
getIntelCacheEntryLineSize(val & 0xff, level, lineSize);
}
/*
* returns '0' if no recognized cache is found, or if the cache
* information is supported by this processor
*/
static unsigned long
getIntelCacheLineSize(int cpuidLevel)
{
int level = 4;
unsigned long lineSize = 0;
unsigned long eax, ebx, ecx, edx;
int repeat, count;
if (cpuidLevel < 2) {
return 0;
}
/* command '2' of the cpuid is intel's cache info call. Each byte of the
* 4 registers contain a potential descriptor for the cache. The CacheMap
* table maps the cache entry with the processor cache. Register 'al'
* contains a count value that cpuid '2' needs to be called in order to
* find all the cache descriptors. Only registers with the high bit set
* to 'zero' have valid descriptors. This code loops through all the
* required calls to cpuid '2' and passes any valid descriptors it finds
* to the getIntelRegisterCacheLineSize code, which breaks the registers
* down into their component descriptors. In the end the lineSize of the
* lowest level cache data cache is returned. */
freebl_cpuid(2, &eax, &ebx, &ecx, &edx);
repeat = eax & 0xf;
for (count = 0; count < repeat; count++) {
if ((eax & 0x80000000) == 0) {
getIntelRegisterCacheLineSize(eax & 0xffffff00, &level, &lineSize);
}
if ((ebx & 0x80000000) == 0) {
getIntelRegisterCacheLineSize(ebx, &level, &lineSize);
}
if ((ecx & 0x80000000) == 0) {
getIntelRegisterCacheLineSize(ecx, &level, &lineSize);
}
if ((edx & 0x80000000) == 0) {
getIntelRegisterCacheLineSize(edx, &level, &lineSize);
}
if (count+1 != repeat) {
freebl_cpuid(2, &eax, &ebx, &ecx, &edx);
}
}
return lineSize;
}
/*
* returns '0' if the cache info is not supported by this processor.
* This is based on the AMD extended cache commands for cpuid.
* (see "AMD Processor Recognition Application Note" Publication 20734).
* Some other processors use the identical scheme.
* (see "Processor Recognition, Transmeta Corporation").
*/
static unsigned long
getOtherCacheLineSize(unsigned long cpuidLevel)
{
unsigned long lineSize = 0;
unsigned long eax, ebx, ecx, edx;
/* get the Extended CPUID level */
freebl_cpuid(0x80000000, &eax, &ebx, &ecx, &edx);
cpuidLevel = eax;
if (cpuidLevel >= 0x80000005) {
freebl_cpuid(0x80000005, &eax, &ebx, &ecx, &edx);
lineSize = ecx & 0xff; /* line Size, L1 Data Cache */
}
return lineSize;
}
static const char * const manMap[] = {
#define INTEL 0
"GenuineIntel",
#define AMD 1
"AuthenticAMD",
#define CYRIX 2
"CyrixInstead",
#define CENTAUR 2
"CentaurHauls",
#define NEXGEN 3
"NexGenDriven",
#define TRANSMETA 4
"GenuineTMx86",
#define RISE 5
"RiseRiseRise",
#define UMC 6
"UMC UMC UMC ",
#define SIS 7
"Sis Sis Sis ",
#define NATIONAL 8
"Geode by NSC",
};
static const int n_manufacturers = sizeof(manMap)/sizeof(manMap[0]);
#define MAN_UNKNOWN 9
#if !defined(AMD_64)
#define SSE2_FLAG (1<<26)
unsigned long
s_mpi_is_sse2()
{
unsigned long eax, ebx, ecx, edx;
int manufacturer = MAN_UNKNOWN;
int i;
char string[13];
if (is386() || is486()) {
return 0;
}
freebl_cpuid(0, &eax, &ebx, &ecx, &edx);
*(int *)string = ebx;
*(int *)&string[4] = edx;
*(int *)&string[8] = ecx;
string[12] = 0;
/* has no SSE2 extensions */
if (eax == 0) {
return 0;
}
for (i=0; i < n_manufacturers; i++) {
if ( strcmp(manMap[i],string) == 0) {
manufacturer = i;
break;
}
}
freebl_cpuid(1,&eax,&ebx,&ecx,&edx);
return (edx & SSE2_FLAG) == SSE2_FLAG;
}
#endif
unsigned long
s_mpi_getProcessorLineSize()
{
unsigned long eax, ebx, ecx, edx;
unsigned long cpuidLevel;
unsigned long cacheLineSize = 0;
int manufacturer = MAN_UNKNOWN;
int i;
char string[65];
#if !defined(AMD_64)
if (is386()) {
return 0; /* 386 had no cache */
} if (is486()) {
return 32; /* really? need more info */
}
#endif
/* Pentium, cpuid command is available */
freebl_cpuid(0, &eax, &ebx, &ecx, &edx);
cpuidLevel = eax;
*(int *)string = ebx;
*(int *)&string[4] = edx;
*(int *)&string[8] = ecx;
string[12] = 0;
manufacturer = MAN_UNKNOWN;
for (i=0; i < n_manufacturers; i++) {
if ( strcmp(manMap[i],string) == 0) {
manufacturer = i;
}
}
if (manufacturer == INTEL) {
cacheLineSize = getIntelCacheLineSize(cpuidLevel);
} else {
cacheLineSize = getOtherCacheLineSize(cpuidLevel);
}
/* doesn't support cache info based on cpuid. This means
* an old pentium class processor, which have cache lines of
* 32. If we learn differently, we can use a switch based on
* the Manufacturer id */
if (cacheLineSize == 0) {
cacheLineSize = 32;
}
return cacheLineSize;
}
#define MPI_GET_PROCESSOR_LINE_SIZE_DEFINED 1
#endif
#if defined(__ppc64__)
/*
* Sigh, The PPC has some really nice features to help us determine cache
* size, since it had lots of direct control functions to do so. The POWER
* processor even has an instruction to do this, but it was dropped in
* PowerPC. Unfortunately most of them are not available in user mode.
*
* The dcbz function would be a great way to determine cache line size except
* 1) it only works on write-back memory (it throws an exception otherwise),
* and 2) because so many mac programs 'knew' the processor cache size was
* 32 bytes, they used this instruction as a fast 'zero 32 bytes'. Now the new
* G5 processor has 128 byte cache, but dcbz only clears 32 bytes to keep
* these programs happy. dcbzl work if 64 bit instructions are supported.
* If you know 64 bit instructions are supported, and that stack is
* write-back, you can use this code.
*/
#include "memory.h"
/* clear the cache line that contains 'array' */
static inline void dcbzl(char *array)
{
register char *a asm("r2") = array;
__asm__ __volatile__( "dcbzl %0,r0" : "=r" (a): "0"(a) );
}
#define PPC_DO_ALIGN(x,y) ((char *)\
((((long long) (x))+((y)-1))&~((y)-1)))
#define PPC_MAX_LINE_SIZE 256
unsigned long
s_mpi_getProcessorLineSize()
{
char testArray[2*PPC_MAX_LINE_SIZE+1];
char *test;
int i;
/* align the array on a maximum line size boundary, so we
* know we are starting to clear from the first address */
test = PPC_DO_ALIGN(testArray, PPC_MAX_LINE_SIZE);
/* set all the values to 1's */
memset(test, 0xff, PPC_MAX_LINE_SIZE);
/* clear one cache block starting at 'test' */
dcbzl(test);
/* find the size of the cleared area, that's our block size */
for (i=PPC_MAX_LINE_SIZE; i != 0; i = i/2) {
if (test[i-1] == 0) {
return i;
}
}
return 0;
}
#define MPI_GET_PROCESSOR_LINE_SIZE_DEFINED 1
#endif
/*
* put other processor and platform specific cache code here
* return the smallest cache line size in bytes on the processor
* (usually the L1 cache). If the OS has a call, this would be
* a greate place to put it.
*
* If there is no cache, return 0;
*
* define MPI_GET_PROCESSOR_LINE_SIZE_DEFINED so the generic functions
* below aren't compiled.
*
*/
/* target.mk can define MPI_CACHE_LINE_SIZE if it's common for the family or
* OS */
#if defined(MPI_CACHE_LINE_SIZE) && !defined(MPI_GET_PROCESSOR_LINE_SIZE_DEFINED)
unsigned long
s_mpi_getProcessorLineSize()
{
return MPI_CACHE_LINE_SIZE;
}
#define MPI_GET_PROCESSOR_LINE_SIZE_DEFINED 1
#endif
/* If no way to get the processor cache line size has been defined, assume
* it's 32 bytes (most common value, does not significantly impact performance)
*/
#ifndef MPI_GET_PROCESSOR_LINE_SIZE_DEFINED
unsigned long
s_mpi_getProcessorLineSize()
{
return 32;
}
#endif
#ifdef TEST_IT
#include <stdio.h>
main()
{
printf("line size = %d\n", s_mpi_getProcessorLineSize());
}
#endif
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