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 "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                     = 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("Unable to register CPU information\n");
  79         }
  80
  81 #ifdef linux
  82         {
  83         char buf[20];
  84         char line[200];
  85         FILE *f = fopen ("/proc/cpuinfo", "r");
  86
  87         if (!f)
  88                 return;
  89         xhkey = 0;
  90         while (fgets(line,200,f)!=NULL) {
  91                 char    *s,*value;
  92
  93                 /* NOTE: the ':' is the only character we can rely on */
  94                 if (!(value = strchr(line,':')))
  95                         continue;
  96                 /* terminate the valuename */
  97                 *value++ = '\0';
  98                 /* skip any leading spaces */
  99                 while (*value==' ') value++;
 100                 if ((s=strchr(value,'\n')))
 101                         *s='\0';
 102
 103                 /* 2.1 method */
 104                 if (!lstrncmpiA(line, "cpu family",strlen("cpu family"))) {
 105                         if (isdigit (value[0])) {
 106                                 switch (value[0] - '0') {
 107                                 case 3: cachedsi.dwProcessorType = PROCESSOR_INTEL_386;
 108                                         cachedsi.wProcessorLevel= 3;
 109                                         break;
 110                                 case 4: cachedsi.dwProcessorType = PROCESSOR_INTEL_486;
 111                                         cachedsi.wProcessorLevel= 4;
 112                                         break;
 113                                 case 5: cachedsi.dwProcessorType = PROCESSOR_INTEL_PENTIUM;
 114                                         cachedsi.wProcessorLevel= 5;
 115                                         break;
 116                                 case 6: cachedsi.dwProcessorType = PROCESSOR_INTEL_PENTIUM;
 117                                         cachedsi.wProcessorLevel= 5;
 118                                         break;
 119                                 default:
 120                                         break;
 121                                 }
 122                         }
 123                         /* set the CPU type of the current processor */
 124                         sprintf(buf,"CPU %ld",cachedsi.dwProcessorType);
 125                         if (xhkey)
 126                                 RegSetValueExA(xhkey,"Identifier",0,REG_SZ,buf,strlen(buf));
 127                         continue;
 128                 }
 129                 /* old 2.0 method */
 130                 if (!lstrncmpiA(line, "cpu",strlen("cpu"))) {
 131                         if (    isdigit (value[0]) && value[1] == '8' &&
 132                                 value[2] == '6' && value[3] == 0
 133                         ) {
 134                                 switch (value[0] - '0') {
 135                                 case 3: cachedsi.dwProcessorType = PROCESSOR_INTEL_386;
 136                                         cachedsi.wProcessorLevel= 3;
 137                                         break;
 138                                 case 4: cachedsi.dwProcessorType = PROCESSOR_INTEL_486;
 139                                         cachedsi.wProcessorLevel= 4;
 140                                         break;
 141                                 case 5: cachedsi.dwProcessorType = PROCESSOR_INTEL_PENTIUM;
 142                                         cachedsi.wProcessorLevel= 5;
 143                                         break;
 144                                 case 6: cachedsi.dwProcessorType = PROCESSOR_INTEL_PENTIUM;
 145                                         cachedsi.wProcessorLevel= 5;
 146                                         break;
 147                                 default:
 148                                         break;
 149                                 }
 150                         }
 151                         /* set the CPU type of the current processor */
 152                         sprintf(buf,"CPU %ld",cachedsi.dwProcessorType);
 153                         if (xhkey)
 154                                 RegSetValueExA(xhkey,"Identifier",0,REG_SZ,buf,strlen(buf));
 155                         continue;
 156                 }
 157                 if (!lstrncmpiA(line,"fdiv_bug",strlen("fdiv_bug"))) {
 158                         if (!lstrncmpiA(value,"yes",3))
 159                                 PF[PF_FLOATING_POINT_PRECISION_ERRATA] = TRUE;
 160
 161                         continue;
 162                 }
 163                 if (!lstrncmpiA(line,"fpu",strlen("fpu"))) {
 164                         if (!lstrncmpiA(value,"no",2))
 165                                 PF[PF_FLOATING_POINT_EMULATED] = TRUE;
 166
 167                         continue;
 168                 }
 169                 if (!lstrncmpiA(line,"processor",strlen("processor"))) {
 170                         /* processor number counts up...*/
 171                         int     x;
 172
 173                         if (sscanf(value,"%d",&x))
 174                                 if (x+1>cachedsi.dwNumberOfProcessors)
 175                                         cachedsi.dwNumberOfProcessors=x+1;
 176
 177                         /* Create a new processor subkey on a multiprocessor
 178                          * system
 179                          */
 180                         sprintf(buf,"%d",x);
 181                         if (xhkey)
 182                                 RegCloseKey(xhkey);
 183                         RegCreateKey16(hkey,buf,&xhkey);
 184                 }
 185                 if (!lstrncmpiA(line,"stepping",strlen("stepping"))) {
 186                         int     x;
 187
 188                         if (sscanf(value,"%d",&x))
 189                                 cachedsi.wProcessorRevision = x;
 190                 }
 191                 if (!lstrncmpiA(line,"flags",strlen("flags"))) {
 192                         if (strstr(value,"cx8"))
 193                                 PF[PF_COMPARE_EXCHANGE_DOUBLE] = TRUE;
 194                         if (strstr(value,"mmx"))
 195                                 PF[PF_MMX_INSTRUCTIONS_AVAILABLE] = TRUE;
 196
 197                 }
 198         }
 199         fclose (f);
 200         }
 201         memcpy(si,&cachedsi,sizeof(*si));
 202 #else  /* linux */
 203         /* FIXME: how do we do this on other systems? */
 204
 205         RegCreateKey16(hkey,"0",&xhkey);
 206         RegSetValueExA(xhkey,"Identifier",0,REG_SZ,"CPU 386",strlen("CPU 386"));
 207 #endif  /* !linux */
 208         if (xhkey)
 209                 RegCloseKey(xhkey);
 210         if (hkey)
 211                 RegCloseKey(hkey);
 212 }
 213
 214
 215 /***********************************************************************
 216  *                      IsProcessorFeaturePresent       [KERNELL32.880]
 217  * RETURNS:
 218  *      TRUE if processorfeature present
 219  *      FALSE otherwise
 220  */
 221 BOOL WINAPI IsProcessorFeaturePresent (
 222         DWORD feature   /* [in] feature number, see PF_ defines */
 223 ) {
 224   SYSTEM_INFO si;
 225   GetSystemInfo (&si); /* To ensure the information is loaded and cached */
 226
 227   if (feature < 64)
 228     return PF[feature];
 229   else
 230     return FALSE;
 231 }