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                   [KERNEL32.@]
  25  *
  26  * Gets the current system information.
  27  *
  28  * On the first call it creates 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  * No NULL ptr check for LPSYSTEM_INFO in Win9x.
  40  *
  41  * RETURNS
  42  *      nothing, really
  43  */
  44 VOID WINAPI GetSystemInfo(
  45         LPSYSTEM_INFO si        /* [out] system information */
  46 ) {
  47         static int cache = 0;
  48         static SYSTEM_INFO cachedsi;
  49         HKEY    xhkey=0,hkey;
  50
  51         if (cache) {
  52                 memcpy(si,&cachedsi,sizeof(*si));
  53                 return;
  54         }
  55         memset(PF,0,sizeof(PF));
  56
  57         /* choose sensible defaults ...
  58          * FIXME: perhaps overrideable with precompiler flags?
  59          */
  60         cachedsi.u.s.wProcessorArchitecture     = PROCESSOR_ARCHITECTURE_INTEL;
  61         cachedsi.dwPageSize                     = getpagesize();
  62
  63         /* FIXME: the two entries below should be computed somehow... */
  64         cachedsi.lpMinimumApplicationAddress    = (void *)0x00010000;
  65         cachedsi.lpMaximumApplicationAddress    = (void *)0x7FFFFFFF;
  66         cachedsi.dwActiveProcessorMask          = 1;
  67         cachedsi.dwNumberOfProcessors           = 1;
  68         cachedsi.dwProcessorType                = PROCESSOR_INTEL_386;
  69         cachedsi.dwAllocationGranularity        = 0x10000;
  70         cachedsi.wProcessorLevel                = 3; /* 386 */
  71         cachedsi.wProcessorRevision             = 0;
  72
  73         cache = 1; /* even if there is no more info, we now have a cacheentry */
  74         memcpy(si,&cachedsi,sizeof(*si));
  75
  76         /* Hmm, reasonable processor feature defaults? */
  77
  78         /* Create these registry keys for all systems
  79          * FPU entry is often empty on Windows, so we don't care either */
  80         if ( (RegCreateKeyA(HKEY_LOCAL_MACHINE,"HARDWARE\\DESCRIPTION\\System\\FloatingPointProcessor",&hkey)!=ERROR_SUCCESS)
  81           || (RegCreateKeyA(HKEY_LOCAL_MACHINE,"HARDWARE\\DESCRIPTION\\System\\CentralProcessor",&hkey)!=ERROR_SUCCESS) )
  82         {
  83             WARN("Unable to write FPU/CPU info to registry\n");
  84         }
  85
  86 #ifdef linux
  87         {
  88         char buf[20];
  89         char line[200];
  90         FILE *f = fopen ("/proc/cpuinfo", "r");
  91
  92         if (!f)
  93                 return;
  94         xhkey = 0;
  95         while (fgets(line,200,f)!=NULL) {
  96                 char    *s,*value;
  97
  98                 /* NOTE: the ':' is the only character we can rely on */
  99                 if (!(value = strchr(line,':')))
 100                         continue;
 101                 /* terminate the valuename */
 102                 *value++ = '\0';
 103                 /* skip any leading spaces */
 104                 while (*value==' ') value++;
 105                 if ((s=strchr(value,'\n')))
 106                         *s='\0';
 107
 108                 /* 2.1 method */
 109                 if (!strncasecmp(line, "cpu family",strlen("cpu family"))) {
 110                         if (isdigit (value[0])) {
 111                                 switch (value[0] - '0') {
 112                                 case 3: cachedsi.dwProcessorType = PROCESSOR_INTEL_386;
 113                                         cachedsi.wProcessorLevel= 3;
 114                                         break;
 115                                 case 4: cachedsi.dwProcessorType = PROCESSOR_INTEL_486;
 116                                         cachedsi.wProcessorLevel= 4;
 117                                         break;
 118                                 case 5:
 119                                 case 6: /* PPro/2/3 has same info as P1 */
 120                                         cachedsi.dwProcessorType = PROCESSOR_INTEL_PENTIUM;
 121                                         cachedsi.wProcessorLevel= 5;
 122                                         break;
 123                                 case 1: /* two-figure levels */
 124                                     if (value[1] == '5')
 125                                     {
 126                                         cachedsi.dwProcessorType = PROCESSOR_INTEL_PENTIUM;
 127                                         cachedsi.wProcessorLevel= 5;
 128                                         break;
 129                                     }
 130                                     /* fall through */
 131                                 default:
 132                                         FIXME("unknown cpu family '%s', please report ! (-> setting to 386)\n", value);
 133                                         break;
 134                                 }
 135                         }
 136                         /* set the CPU type of the current processor */
 137                         sprintf(buf,"CPU %ld",cachedsi.dwProcessorType);
 138                         if (xhkey)
 139                                 RegSetValueExA(xhkey,"Identifier",0,REG_SZ,buf,strlen(buf));
 140                         continue;
 141                 }
 142                 /* old 2.0 method */
 143                 if (!strncasecmp(line, "cpu",strlen("cpu"))) {
 144                         if (    isdigit (value[0]) && value[1] == '8' &&
 145                                 value[2] == '6' && value[3] == 0
 146                         ) {
 147                                 switch (value[0] - '0') {
 148                                 case 3: cachedsi.dwProcessorType = PROCESSOR_INTEL_386;
 149                                         cachedsi.wProcessorLevel= 3;
 150                                         break;
 151                                 case 4: cachedsi.dwProcessorType = PROCESSOR_INTEL_486;
 152                                         cachedsi.wProcessorLevel= 4;
 153                                         break;
 154                                 case 5:
 155                                 case 6: /* PPro/2/3 has same info as P1 */
 156                                         cachedsi.dwProcessorType = PROCESSOR_INTEL_PENTIUM;
 157                                         cachedsi.wProcessorLevel= 5;
 158                                         break;
 159                                 default:
 160                                         FIXME("unknown Linux 2.0 cpu family '%s', please report ! (-> setting to 386)\n", value);
 161                                         break;
 162                                 }
 163                         }
 164                         /* set the CPU type of the current processor
 165                          * FIXME: someone reported P4 as being set to
 166                          * "              Intel(R) Pentium(R) 4 CPU 1500MHz"
 167                          * Do we need to do the same ?
 168                          * */
 169                         sprintf(buf,"CPU %ld",cachedsi.dwProcessorType);
 170                         if (xhkey)
 171                                 RegSetValueExA(xhkey,"Identifier",0,REG_SZ,buf,strlen(buf));
 172                         continue;
 173                 }
 174                 if (!strncasecmp(line,"fdiv_bug",strlen("fdiv_bug"))) {
 175                         if (!strncasecmp(value,"yes",3))
 176                                 PF[PF_FLOATING_POINT_PRECISION_ERRATA] = TRUE;
 177
 178                         continue;
 179                 }
 180                 if (!strncasecmp(line,"fpu",strlen("fpu"))) {
 181                         if (!strncasecmp(value,"no",2))
 182                                 PF[PF_FLOATING_POINT_EMULATED] = TRUE;
 183
 184                         continue;
 185                 }
 186                 if (!strncasecmp(line,"processor",strlen("processor"))) {
 187                         /* processor number counts up... */
 188                         unsigned int x;
 189
 190                         if (sscanf(value,"%d",&x))
 191                                 if (x+1>cachedsi.dwNumberOfProcessors)
 192                                         cachedsi.dwNumberOfProcessors=x+1;
 193
 194                         /* Create a new processor subkey on a multiprocessor
 195                          * system
 196                          */
 197                         sprintf(buf,"%d",x);
 198                         if (xhkey)
 199                                 RegCloseKey(xhkey);
 200                         RegCreateKeyA(hkey,buf,&xhkey);
 201                 }
 202                 if (!strncasecmp(line,"stepping",strlen("stepping"))) {
 203                         int     x;
 204
 205                         if (sscanf(value,"%d",&x))
 206                                 cachedsi.wProcessorRevision = x;
 207                 }
 208                 if (    !strncasecmp(line,"flags",strlen("flags"))      ||
 209                         !strncasecmp(line,"features",strlen("features"))
 210                 ) {
 211                         if (strstr(value,"cx8"))
 212                                 PF[PF_COMPARE_EXCHANGE_DOUBLE] = TRUE;
 213                         if (strstr(value,"mmx"))
 214                                 PF[PF_MMX_INSTRUCTIONS_AVAILABLE] = TRUE;
 215                         if (strstr(value,"tsc"))
 216                                 PF[PF_RDTSC_INSTRUCTION_AVAILABLE] = TRUE;
 217
 218                 }
 219         }
 220         fclose (f);
 221         }
 222         memcpy(si,&cachedsi,sizeof(*si));
 223 #else  /* linux */
 224         /* FIXME: how do we do this on other systems? */
 225
 226         RegCreateKeyA(hkey,"0",&xhkey);
 227         RegSetValueExA(xhkey,"Identifier",0,REG_SZ,"CPU 386",strlen("CPU 386"));
 228 #endif  /* !linux */
 229         if (xhkey)
 230                 RegCloseKey(xhkey);
 231         if (hkey)
 232                 RegCloseKey(hkey);
 233 }
 234
 235
 236 /***********************************************************************
 237  *                      IsProcessorFeaturePresent       [KERNEL32.@]
 238  * RETURNS:
 239  *      TRUE if processor feature present
 240  *      FALSE otherwise
 241  */
 242 BOOL WINAPI IsProcessorFeaturePresent (
 243         DWORD feature   /* [in] feature number, see PF_ defines */
 244 ) {
 245   SYSTEM_INFO si;
 246   GetSystemInfo (&si); /* To ensure the information is loaded and cached */
 247
 248   if (feature < 64)
 249     return PF[feature];
 250   else
 251     return FALSE;
 252 }