misc/cpu.c

   1 /*
   2  * What processor?
   3  *
   4  * Copyright 1995,1997 Morten Welinder
   5  * Copyright 1997-1998 Marcus Meissner
   6  */
   7
   8 #include "wine/port.h"
   9
  10 #include <ctype.h>
  11 #include <string.h>
  12 #include <stdio.h>
  13
  14 #include "winbase.h"
  15 #include "winreg.h"
  16 #include "winnt.h"
  17 #include "winerror.h"
  18 #include "debugtools.h"
  19
  20 DEFAULT_DEBUG_CHANNEL(reg);
  21
  22 static BYTE PF[64] = {0,};
  23
  24 /***********************************************************************
  25  *                      GetSystemInfo                   [KERNEL32.@]
  26  *
  27  * Gets the current system information.
  28  *
  29  * On the first call it creates cached values, so it doesn't have to determine
  30  * them repeatedly. On Linux, the /proc/cpuinfo special file is used.
  31  *
  32  * It creates a registry subhierarchy, looking like:
  33  * \HARDWARE\DESCRIPTION\System\CentralProcessor\<processornumber>\
  34  *                                                      Identifier (CPU x86)
  35  * Note that there is a hierarchy for every processor installed, so this
  36  * supports multiprocessor systems. This is done like Win95 does it, I think.
  37  *
  38  * It also creates a cached flag array for IsProcessorFeaturePresent().
  39  *
  40  * No NULL ptr check for LPSYSTEM_INFO in Win9x.
  41  *
  42  * RETURNS
  43  *      nothing, really
  44  */
  45 VOID WINAPI GetSystemInfo(
  46         LPSYSTEM_INFO si        /* [out] system information */
  47 ) {
  48         static int cache = 0;
  49         static SYSTEM_INFO cachedsi;
  50         HKEY    xhkey=0,hkey;
  51
  52         if (cache) {
  53                 memcpy(si,&cachedsi,sizeof(*si));
  54                 return;
  55         }
  56         memset(PF,0,sizeof(PF));
  57
  58         /* choose sensible defaults ...
  59          * FIXME: perhaps overrideable with precompiler flags?
  60          */
  61         cachedsi.u.s.wProcessorArchitecture     = PROCESSOR_ARCHITECTURE_INTEL;
  62         cachedsi.dwPageSize                     = getpagesize();
  63
  64         /* FIXME: the two entries below should be computed somehow... */
  65         cachedsi.lpMinimumApplicationAddress    = (void *)0x00010000;
  66         cachedsi.lpMaximumApplicationAddress    = (void *)0x7FFFFFFF;
  67         cachedsi.dwActiveProcessorMask          = 1;
  68         cachedsi.dwNumberOfProcessors           = 1;
  69         cachedsi.dwProcessorType                = PROCESSOR_INTEL_386;
  70         cachedsi.dwAllocationGranularity        = 0x10000;
  71         cachedsi.wProcessorLevel                = 3; /* 386 */
  72         cachedsi.wProcessorRevision             = 0;
  73
  74         cache = 1; /* even if there is no more info, we now have a cacheentry */
  75         memcpy(si,&cachedsi,sizeof(*si));
  76
  77         /* Hmm, reasonable processor feature defaults? */
  78
  79         /* Create these registry keys for all systems
  80          * FPU entry is often empty on Windows, so we don't care either */
  81         if ( (RegCreateKeyA(HKEY_LOCAL_MACHINE,"HARDWARE\\DESCRIPTION\\System\\FloatingPointProcessor",&hkey)!=ERROR_SUCCESS)
  82           || (RegCreateKeyA(HKEY_LOCAL_MACHINE,"HARDWARE\\DESCRIPTION\\System\\CentralProcessor",&hkey)!=ERROR_SUCCESS) )
  83         {
  84             WARN("Unable to write FPU/CPU info to registry\n");
  85         }
  86
  87 #ifdef linux
  88         {
  89         char buf[20];
  90         char line[200];
  91         FILE *f = fopen ("/proc/cpuinfo", "r");
  92
  93         if (!f)
  94                 return;
  95         xhkey = 0;
  96         while (fgets(line,200,f)!=NULL) {
  97                 char    *s,*value;
  98
  99                 /* NOTE: the ':' is the only character we can rely on */
 100                 if (!(value = strchr(line,':')))
 101                         continue;
 102                 /* terminate the valuename */
 103                 *value++ = '\0';
 104                 /* skip any leading spaces */
 105                 while (*value==' ') value++;
 106                 if ((s=strchr(value,'\n')))
 107                         *s='\0';
 108
 109                 /* 2.1 method */
 110                 if (!strncasecmp(line, "cpu family",strlen("cpu family"))) {
 111                         if (isdigit (value[0])) {
 112                                 switch (value[0] - '0') {
 113                                 case 3: cachedsi.dwProcessorType = PROCESSOR_INTEL_386;
 114                                         cachedsi.wProcessorLevel= 3;
 115                                         break;
 116                                 case 4: cachedsi.dwProcessorType = PROCESSOR_INTEL_486;
 117                                         cachedsi.wProcessorLevel= 4;
 118                                         break;
 119                                 case 5:
 120                                 case 6: /* PPro/2/3 has same info as P1 */
 121                                         cachedsi.dwProcessorType = PROCESSOR_INTEL_PENTIUM;
 122                                         cachedsi.wProcessorLevel= 5;
 123                                         break;
 124                                 case 1: /* two-figure levels */
 125                                     if (value[1] == '5')
 126                                     {
 127                                         cachedsi.dwProcessorType = PROCESSOR_INTEL_PENTIUM;
 128                                         cachedsi.wProcessorLevel= 5;
 129                                         break;
 130                                     }
 131                                     /* fall through */
 132                                 default:
 133                                         FIXME("unknown cpu family '%s', please report ! (-> setting to 386)\n", value);
 134                                         break;
 135                                 }
 136                         }
 137                         /* set the CPU type of the current processor */
 138                         sprintf(buf,"CPU %ld",cachedsi.dwProcessorType);
 139                         if (xhkey)
 140                                 RegSetValueExA(xhkey,"Identifier",0,REG_SZ,buf,strlen(buf));
 141                         continue;
 142                 }
 143                 /* old 2.0 method */
 144                 if (!strncasecmp(line, "cpu",strlen("cpu"))) {
 145                         if (    isdigit (value[0]) && value[1] == '8' &&
 146                                 value[2] == '6' && value[3] == 0
 147                         ) {
 148                                 switch (value[0] - '0') {
 149                                 case 3: cachedsi.dwProcessorType = PROCESSOR_INTEL_386;
 150                                         cachedsi.wProcessorLevel= 3;
 151                                         break;
 152                                 case 4: cachedsi.dwProcessorType = PROCESSOR_INTEL_486;
 153                                         cachedsi.wProcessorLevel= 4;
 154                                         break;
 155                                 case 5:
 156                                 case 6: /* PPro/2/3 has same info as P1 */
 157                                         cachedsi.dwProcessorType = PROCESSOR_INTEL_PENTIUM;
 158                                         cachedsi.wProcessorLevel= 5;
 159                                         break;
 160                                 default:
 161                                         FIXME("unknown Linux 2.0 cpu family '%s', please report ! (-> setting to 386)\n", value);
 162                                         break;
 163                                 }
 164                         }
 165                         /* set the CPU type of the current processor
 166                          * FIXME: someone reported P4 as being set to
 167                          * "              Intel(R) Pentium(R) 4 CPU 1500MHz"
 168                          * Do we need to do the same ?
 169                          * */
 170                         sprintf(buf,"CPU %ld",cachedsi.dwProcessorType);
 171                         if (xhkey)
 172                                 RegSetValueExA(xhkey,"Identifier",0,REG_SZ,buf,strlen(buf));
 173                         continue;
 174                 }
 175                 if (!strncasecmp(line,"fdiv_bug",strlen("fdiv_bug"))) {
 176                         if (!strncasecmp(value,"yes",3))
 177                                 PF[PF_FLOATING_POINT_PRECISION_ERRATA] = TRUE;
 178
 179                         continue;
 180                 }
 181                 if (!strncasecmp(line,"fpu",strlen("fpu"))) {
 182                         if (!strncasecmp(value,"no",2))
 183                                 PF[PF_FLOATING_POINT_EMULATED] = TRUE;
 184
 185                         continue;
 186                 }
 187                 if (!strncasecmp(line,"processor",strlen("processor"))) {
 188                         /* processor number counts up... */
 189                         unsigned int x;
 190
 191                         if (sscanf(value,"%d",&x))
 192                                 if (x+1>cachedsi.dwNumberOfProcessors)
 193                                         cachedsi.dwNumberOfProcessors=x+1;
 194
 195                         /* Create a new processor subkey on a multiprocessor
 196                          * system
 197                          */
 198                         sprintf(buf,"%d",x);
 199                         if (xhkey)
 200                                 RegCloseKey(xhkey);
 201                         RegCreateKeyA(hkey,buf,&xhkey);
 202                 }
 203                 if (!strncasecmp(line,"stepping",strlen("stepping"))) {
 204                         int     x;
 205
 206                         if (sscanf(value,"%d",&x))
 207                                 cachedsi.wProcessorRevision = x;
 208                 }
 209                 if (    !strncasecmp(line,"flags",strlen("flags"))      ||
 210                         !strncasecmp(line,"features",strlen("features"))
 211                 ) {
 212                         if (strstr(value,"cx8"))
 213                                 PF[PF_COMPARE_EXCHANGE_DOUBLE] = TRUE;
 214                         if (strstr(value,"mmx"))
 215                                 PF[PF_MMX_INSTRUCTIONS_AVAILABLE] = TRUE;
 216                         if (strstr(value,"tsc"))
 217                                 PF[PF_RDTSC_INSTRUCTION_AVAILABLE] = TRUE;
 218
 219                 }
 220         }
 221         fclose (f);
 222         }
 223         memcpy(si,&cachedsi,sizeof(*si));
 224 #else  /* linux */
 225         /* FIXME: how do we do this on other systems? */
 226
 227         RegCreateKeyA(hkey,"0",&xhkey);
 228         RegSetValueExA(xhkey,"Identifier",0,REG_SZ,"CPU 386",strlen("CPU 386"));
 229 #endif  /* !linux */
 230         if (xhkey)
 231                 RegCloseKey(xhkey);
 232         if (hkey)
 233                 RegCloseKey(hkey);
 234 }
 235
 236
 237 /***********************************************************************
 238  *                      IsProcessorFeaturePresent       [KERNEL32.@]
 239  * RETURNS:
 240  *      TRUE if processor feature present
 241  *      FALSE otherwise
 242  */
 243 BOOL WINAPI IsProcessorFeaturePresent (
 244         DWORD feature   /* [in] feature number, see PF_ defines */
 245 ) {
 246   SYSTEM_INFO si;
 247   GetSystemInfo (&si); /* To ensure the information is loaded and cached */
 248
 249   if (feature < 64)
 250     return PF[feature];
 251   else
 252     return FALSE;
 253 }