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