misc/cpu.c

   1 /*
   2  * What processor?
   3  *
   4  * Copyright 1995,1997 Morten Welinder
   5  * Copyright 1997-1998 Marcus Meissner
   6  */
   7
   8 #include <ctype.h>
   9 #include <string.h>
  10 #include <stdio.h>
  11 #include "config.h"
  12 #include "wine/port.h"
  13 #include "winbase.h"
  14 #include "winreg.h"
  15 #include "winnt.h"
  16 #include "winerror.h"
  17 #include "debugtools.h"
  18
  19 DEFAULT_DEBUG_CHANNEL(reg);
  20
  21 static BYTE PF[64] = {0,};
  22
  23 /***********************************************************************
  24  *                      GetSystemInfo                   [KERNELL32.404]
  25  *
  26  * Gets the current system information.
  27  *
  28  * On the first call it reads cached values, so it doesn't have to determine
  29  * them repeatedly. On Linux, the /proc/cpuinfo special file is used.
  30  *
  31  * It creates a registry subhierarchy, looking like:
  32  * \HARDWARE\DESCRIPTION\System\CentralProcessor\<processornumber>\
  33  *                                                      Identifier (CPU x86)
  34  * Note that there is a hierarchy for every processor installed, so this
  35  * supports multiprocessor systems. This is done like Win95 does it, I think.
  36  *
  37  * It also creates a cached flag array for IsProcessorFeaturePresent().
  38  *
  39  * RETURNS
  40  *      nothing, really
  41  */
  42 VOID WINAPI GetSystemInfo(
  43         LPSYSTEM_INFO si        /* [out] system information */
  44 ) {
  45         static int cache = 0;
  46         static SYSTEM_INFO cachedsi;
  47         HKEY    xhkey=0,hkey;
  48
  49         if (cache) {
  50                 memcpy(si,&cachedsi,sizeof(*si));
  51                 return;
  52         }
  53         memset(PF,0,sizeof(PF));
  54
  55         /* choose sensible defaults ...
  56          * FIXME: perhaps overrideable with precompiler flags?
  57          */
  58         cachedsi.u.s.wProcessorArchitecture     = PROCESSOR_ARCHITECTURE_INTEL;
  59         cachedsi.dwPageSize                     = getpagesize();
  60
  61         /* FIXME: the two entries below should be computed somehow... */
  62         cachedsi.lpMinimumApplicationAddress    = (void *)0x00010000;
  63         cachedsi.lpMaximumApplicationAddress    = (void *)0x7FFFFFFF;
  64         cachedsi.dwActiveProcessorMask          = 1;
  65         cachedsi.dwNumberOfProcessors           = 1;
  66         cachedsi.dwProcessorType                = PROCESSOR_INTEL_386;
  67         cachedsi.dwAllocationGranularity        = 0x10000;
  68         cachedsi.wProcessorLevel                = 3; /* 386 */
  69         cachedsi.wProcessorRevision             = 0;
  70
  71         cache = 1; /* even if there is no more info, we now have a cacheentry */
  72         memcpy(si,&cachedsi,sizeof(*si));
  73
  74         /* Hmm, reasonable processor feature defaults? */
  75
  76         /* Create these registry keys for all systems
  77          * FPU entry is often empty on Windows, so we don't care either */
  78         if ( (RegCreateKeyA(HKEY_LOCAL_MACHINE,"HARDWARE\\DESCRIPTION\\System\\FloatingPointProcessor",&hkey)!=ERROR_SUCCESS)
  79           || (RegCreateKeyA(HKEY_LOCAL_MACHINE,"HARDWARE\\DESCRIPTION\\System\\CentralProcessor",&hkey)!=ERROR_SUCCESS) )
  80         {
  81             WARN("Unable to write FPU/CPU info to registry\n");
  82         }
  83
  84 #ifdef linux
  85         {
  86         char buf[20];
  87         char line[200];
  88         FILE *f = fopen ("/proc/cpuinfo", "r");
  89
  90         if (!f)
  91                 return;
  92         xhkey = 0;
  93         while (fgets(line,200,f)!=NULL) {
  94                 char    *s,*value;
  95
  96                 /* NOTE: the ':' is the only character we can rely on */
  97                 if (!(value = strchr(line,':')))
  98                         continue;
  99                 /* terminate the valuename */
 100                 *value++ = '\0';
 101                 /* skip any leading spaces */
 102                 while (*value==' ') value++;
 103                 if ((s=strchr(value,'\n')))
 104                         *s='\0';
 105
 106                 /* 2.1 method */
 107                 if (!strncasecmp(line, "cpu family",strlen("cpu family"))) {
 108                         if (isdigit (value[0])) {
 109                                 switch (value[0] - '0') {
 110                                 case 3: cachedsi.dwProcessorType = PROCESSOR_INTEL_386;
 111                                         cachedsi.wProcessorLevel= 3;
 112                                         break;
 113                                 case 4: cachedsi.dwProcessorType = PROCESSOR_INTEL_486;
 114                                         cachedsi.wProcessorLevel= 4;
 115                                         break;
 116                                 case 5: cachedsi.dwProcessorType = PROCESSOR_INTEL_PENTIUM;
 117                                         cachedsi.wProcessorLevel= 5;
 118                                         break;
 119                                 case 6: cachedsi.dwProcessorType = PROCESSOR_INTEL_PENTIUM;
 120                                         cachedsi.wProcessorLevel= 5;
 121                                         break;
 122                                 default:
 123                                         break;
 124                                 }
 125                         }
 126                         /* set the CPU type of the current processor */
 127                         sprintf(buf,"CPU %ld",cachedsi.dwProcessorType);
 128                         if (xhkey)
 129                                 RegSetValueExA(xhkey,"Identifier",0,REG_SZ,buf,strlen(buf));
 130                         continue;
 131                 }
 132                 /* old 2.0 method */
 133                 if (!strncasecmp(line, "cpu",strlen("cpu"))) {
 134                         if (    isdigit (value[0]) && value[1] == '8' &&
 135                                 value[2] == '6' && value[3] == 0
 136                         ) {
 137                                 switch (value[0] - '0') {
 138                                 case 3: cachedsi.dwProcessorType = PROCESSOR_INTEL_386;
 139                                         cachedsi.wProcessorLevel= 3;
 140                                         break;
 141                                 case 4: cachedsi.dwProcessorType = PROCESSOR_INTEL_486;
 142                                         cachedsi.wProcessorLevel= 4;
 143                                         break;
 144                                 case 5: cachedsi.dwProcessorType = PROCESSOR_INTEL_PENTIUM;
 145                                         cachedsi.wProcessorLevel= 5;
 146                                         break;
 147                                 case 6: cachedsi.dwProcessorType = PROCESSOR_INTEL_PENTIUM;
 148                                         cachedsi.wProcessorLevel= 5;
 149                                         break;
 150                                 default:
 151                                         break;
 152                                 }
 153                         }
 154                         /* set the CPU type of the current processor */
 155                         sprintf(buf,"CPU %ld",cachedsi.dwProcessorType);
 156                         if (xhkey)
 157                                 RegSetValueExA(xhkey,"Identifier",0,REG_SZ,buf,strlen(buf));
 158                         continue;
 159                 }
 160                 if (!strncasecmp(line,"fdiv_bug",strlen("fdiv_bug"))) {
 161                         if (!strncasecmp(value,"yes",3))
 162                                 PF[PF_FLOATING_POINT_PRECISION_ERRATA] = TRUE;
 163
 164                         continue;
 165                 }
 166                 if (!strncasecmp(line,"fpu",strlen("fpu"))) {
 167                         if (!strncasecmp(value,"no",2))
 168                                 PF[PF_FLOATING_POINT_EMULATED] = TRUE;
 169
 170                         continue;
 171                 }
 172                 if (!strncasecmp(line,"processor",strlen("processor"))) {
 173                         /* processor number counts up... */
 174                         unsigned int x;
 175
 176                         if (sscanf(value,"%d",&x))
 177                                 if (x+1>cachedsi.dwNumberOfProcessors)
 178                                         cachedsi.dwNumberOfProcessors=x+1;
 179
 180                         /* Create a new processor subkey on a multiprocessor
 181                          * system
 182                          */
 183                         sprintf(buf,"%d",x);
 184                         if (xhkey)
 185                                 RegCloseKey(xhkey);
 186                         RegCreateKeyA(hkey,buf,&xhkey);
 187                 }
 188                 if (!strncasecmp(line,"stepping",strlen("stepping"))) {
 189                         int     x;
 190
 191                         if (sscanf(value,"%d",&x))
 192                                 cachedsi.wProcessorRevision = x;
 193                 }
 194                 if (    !strncasecmp(line,"flags",strlen("flags"))      ||
 195                         !strncasecmp(line,"features",strlen("features"))
 196                 ) {
 197                         if (strstr(value,"cx8"))
 198                                 PF[PF_COMPARE_EXCHANGE_DOUBLE] = TRUE;
 199                         if (strstr(value,"mmx"))
 200                                 PF[PF_MMX_INSTRUCTIONS_AVAILABLE] = TRUE;
 201                         if (strstr(value,"tsc"))
 202                                 PF[PF_RDTSC_INSTRUCTION_AVAILABLE] = TRUE;
 203
 204                 }
 205         }
 206         fclose (f);
 207         }
 208         memcpy(si,&cachedsi,sizeof(*si));
 209 #else  /* linux */
 210         /* FIXME: how do we do this on other systems? */
 211
 212         RegCreateKeyA(hkey,"0",&xhkey);
 213         RegSetValueExA(xhkey,"Identifier",0,REG_SZ,"CPU 386",strlen("CPU 386"));
 214 #endif  /* !linux */
 215         if (xhkey)
 216                 RegCloseKey(xhkey);
 217         if (hkey)
 218                 RegCloseKey(hkey);
 219 }
 220
 221
 222 /***********************************************************************
 223  *                      IsProcessorFeaturePresent       [KERNELL32.880]
 224  * RETURNS:
 225  *      TRUE if processorfeature present
 226  *      FALSE otherwise
 227  */
 228 BOOL WINAPI IsProcessorFeaturePresent (
 229         DWORD feature   /* [in] feature number, see PF_ defines */
 230 ) {
 231   SYSTEM_INFO si;
 232   GetSystemInfo (&si); /* To ensure the information is loaded and cached */
 233
 234   if (feature < 64)
 235     return PF[feature];
 236   else
 237     return FALSE;
 238 }