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 "winbase.h"
  11 #include "wine/winbase16.h"
  12 #include "wine/winestring.h"
  13 #include "winreg.h"
  14 #include "global.h"
  15 #include "winnt.h"
  16 #include "winerror.h"
  17 #include "winreg.h"
  18 #include "debug.h"
  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         char    buf[20];
  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.x.wProcessorArchitecture     = PROCESSOR_ARCHITECTURE_INTEL;
  59         cachedsi.dwPageSize                     = VIRTUAL_GetPageSize();
  60
  61         /* FIXME: better values for the two entries below... */
  62         cachedsi.lpMinimumApplicationAddress    = (void *)0x40000000;
  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 this registry key for all systems */
  77         if (RegCreateKey16(HKEY_LOCAL_MACHINE,"HARDWARE\\DESCRIPTION\\System\\CentralProcessor",&hkey)!=ERROR_SUCCESS) {
  78             WARN(reg,"Unable to register CPU information\n");
  79         }
  80
  81 #ifdef linux
  82         {
  83         char line[200];
  84         FILE *f = fopen ("/proc/cpuinfo", "r");
  85
  86         if (!f)
  87                 return;
  88         xhkey = 0;
  89         while (fgets(line,200,f)!=NULL) {
  90                 char    *s,*value;
  91
  92                 /* NOTE: the ':' is the only character we can rely on */
  93                 if (!(value = strchr(line,':')))
  94                         continue;
  95                 /* terminate the valuename */
  96                 *value++ = '\0';
  97                 /* skip any leading spaces */
  98                 while (*value==' ') value++;
  99                 if ((s=strchr(value,'\n')))
 100                         *s='\0';
 101
 102                 /* 2.1 method */
 103                 if (!lstrncmpiA(line, "cpu family",strlen("cpu family"))) {
 104                         if (isdigit (value[0])) {
 105                                 switch (value[0] - '0') {
 106                                 case 3: cachedsi.dwProcessorType = PROCESSOR_INTEL_386;
 107                                         cachedsi.wProcessorLevel= 3;
 108                                         break;
 109                                 case 4: cachedsi.dwProcessorType = PROCESSOR_INTEL_486;
 110                                         cachedsi.wProcessorLevel= 4;
 111                                         break;
 112                                 case 5: cachedsi.dwProcessorType = PROCESSOR_INTEL_PENTIUM;
 113                                         cachedsi.wProcessorLevel= 5;
 114                                         break;
 115                                 case 6: cachedsi.dwProcessorType = PROCESSOR_INTEL_PENTIUM;
 116                                         cachedsi.wProcessorLevel= 5;
 117                                         break;
 118                                 default:
 119                                         break;
 120                                 }
 121                         }
 122                         /* set the CPU type of the current processor */
 123                         sprintf(buf,"CPU %ld",cachedsi.dwProcessorType);
 124                         if (xhkey)
 125                                 RegSetValueExA(xhkey,"Identifier",0,REG_SZ,buf,strlen(buf));
 126                         continue;
 127                 }
 128                 /* old 2.0 method */
 129                 if (!lstrncmpiA(line, "cpu",strlen("cpu"))) {
 130                         if (    isdigit (value[0]) && value[1] == '8' &&
 131                                 value[2] == '6' && value[3] == 0
 132                         ) {
 133                                 switch (value[0] - '0') {
 134                                 case 3: cachedsi.dwProcessorType = PROCESSOR_INTEL_386;
 135                                         cachedsi.wProcessorLevel= 3;
 136                                         break;
 137                                 case 4: cachedsi.dwProcessorType = PROCESSOR_INTEL_486;
 138                                         cachedsi.wProcessorLevel= 4;
 139                                         break;
 140                                 case 5: cachedsi.dwProcessorType = PROCESSOR_INTEL_PENTIUM;
 141                                         cachedsi.wProcessorLevel= 5;
 142                                         break;
 143                                 case 6: cachedsi.dwProcessorType = PROCESSOR_INTEL_PENTIUM;
 144                                         cachedsi.wProcessorLevel= 5;
 145                                         break;
 146                                 default:
 147                                         break;
 148                                 }
 149                         }
 150                         /* set the CPU type of the current processor */
 151                         sprintf(buf,"CPU %ld",cachedsi.dwProcessorType);
 152                         if (xhkey)
 153                                 RegSetValueExA(xhkey,"Identifier",0,REG_SZ,buf,strlen(buf));
 154                         continue;
 155                 }
 156                 if (!lstrncmpiA(line,"fdiv_bug",strlen("fdiv_bug"))) {
 157                         if (!lstrncmpiA(value,"yes",3))
 158                                 PF[PF_FLOATING_POINT_PRECISION_ERRATA] = TRUE;
 159
 160                         continue;
 161                 }
 162                 if (!lstrncmpiA(line,"fpu",strlen("fpu"))) {
 163                         if (!lstrncmpiA(value,"no",2))
 164                                 PF[PF_FLOATING_POINT_EMULATED] = TRUE;
 165
 166                         continue;
 167                 }
 168                 if (!lstrncmpiA(line,"processor",strlen("processor"))) {
 169                         /* processor number counts up...*/
 170                         int     x;
 171
 172                         if (sscanf(value,"%d",&x))
 173                                 if (x+1>cachedsi.dwNumberOfProcessors)
 174                                         cachedsi.dwNumberOfProcessors=x+1;
 175
 176                         /* Create a new processor subkey on a multiprocessor
 177                          * system
 178                          */
 179                         sprintf(buf,"%d",x);
 180                         if (xhkey)
 181                                 RegCloseKey(xhkey);
 182                         RegCreateKey16(hkey,buf,&xhkey);
 183                 }
 184                 if (!lstrncmpiA(line,"stepping",strlen("stepping"))) {
 185                         int     x;
 186
 187                         if (sscanf(value,"%d",&x))
 188                                 cachedsi.wProcessorRevision = x;
 189                 }
 190                 if (!lstrncmpiA(line,"flags",strlen("flags"))) {
 191                         if (strstr(value,"cx8"))
 192                                 PF[PF_COMPARE_EXCHANGE_DOUBLE] = TRUE;
 193                         if (strstr(value,"mmx"))
 194                                 PF[PF_MMX_INSTRUCTIONS_AVAILABLE] = TRUE;
 195
 196                 }
 197         }
 198         fclose (f);
 199         }
 200         memcpy(si,&cachedsi,sizeof(*si));
 201 #else  /* linux */
 202         /* FIXME: how do we do this on other systems? */
 203
 204         RegCreateKey16(hkey,"0",&xhkey);
 205         RegSetValueExA(xhkey,"Identifier",0,REG_SZ,"CPU 386",strlen("CPU 386"));
 206 #endif  /* !linux */
 207         if (xhkey)
 208                 RegCloseKey(xhkey);
 209         if (hkey)
 210                 RegCloseKey(hkey);
 211 }
 212
 213
 214 /***********************************************************************
 215  *                      IsProcessorFeaturePresent       [KERNELL32.880]
 216  * RETURNS:
 217  *      TRUE if processorfeature present
 218  *      FALSE otherwise
 219  */
 220 BOOL WINAPI IsProcessorFeaturePresent (
 221         DWORD feature   /* [in] feature number, see PF_ defines */
 222 ) {
 223   SYSTEM_INFO si;
 224   GetSystemInfo (&si); /* To ensure the information is loaded and cached */
 225
 226   if (feature < 64)
 227     return PF[feature];
 228   else
 229     return FALSE;
 230 }