external/public-domain/xz/dist/src/common/tuklib_physmem.c

   1 ///////////////////////////////////////////////////////////////////////////////
   2 //
   3 /// \file       tuklib_physmem.c
   4 /// \brief      Get the amount of physical memory
   5 //
   6 //  Author:     Lasse Collin
   7 //
   8 //  This file has been put into the public domain.
   9 //  You can do whatever you want with this file.
  10 //
  11 ///////////////////////////////////////////////////////////////////////////////
  12
  13 #include "tuklib_physmem.h"
  14
  15 // We want to use Windows-specific code on Cygwin, which also has memory
  16 // information available via sysconf(), but on Cygwin 1.5 and older it
  17 // gives wrong results (from our point of view).
  18 #if defined(_WIN32) || defined(__CYGWIN__)
  19 #       ifndef _WIN32_WINNT
  20 #               define _WIN32_WINNT 0x0500
  21 #       endif
  22 #       include <windows.h>
  23
  24 #elif defined(__OS2__)
  25 #       define INCL_DOSMISC
  26 #       include <os2.h>
  27
  28 #elif defined(__DJGPP__)
  29 #       include <dpmi.h>
  30
  31 #elif defined(__VMS)
  32 #       include <lib$routines.h>
  33 #       include <syidef.h>
  34 #       include <ssdef.h>
  35
  36 // AIX
  37 #elif defined(TUKLIB_PHYSMEM_AIX)
  38 #       include <sys/systemcfg.h>
  39
  40 #elif defined(TUKLIB_PHYSMEM_SYSCONF)
  41 #       include <unistd.h>
  42
  43 #elif defined(TUKLIB_PHYSMEM_SYSCTL)
  44 #       ifdef HAVE_SYS_PARAM_H
  45 #               include <sys/param.h>
  46 #       endif
  47 #       include <sys/sysctl.h>
  48
  49 // Tru64
  50 #elif defined(TUKLIB_PHYSMEM_GETSYSINFO)
  51 #       include <sys/sysinfo.h>
  52 #       include <machine/hal_sysinfo.h>
  53
  54 // HP-UX
  55 #elif defined(TUKLIB_PHYSMEM_PSTAT_GETSTATIC)
  56 #       include <sys/param.h>
  57 #       include <sys/pstat.h>
  58
  59 // IRIX
  60 #elif defined(TUKLIB_PHYSMEM_GETINVENT_R)
  61 #       include <invent.h>
  62
  63 // This sysinfo() is Linux-specific.
  64 #elif defined(TUKLIB_PHYSMEM_SYSINFO)
  65 #       include <sys/sysinfo.h>
  66 #endif
  67
  68
  69 extern uint64_t
  70 tuklib_physmem(void)
  71 {
  72 #ifdef __minix
  73         return 0;
  74 #else
  75         uint64_t ret = 0;
  76
  77 #if defined(_WIN32) || defined(__CYGWIN__)
  78         if ((GetVersion() & 0xFF) >= 5) {
  79                 // Windows 2000 and later have GlobalMemoryStatusEx() which
  80                 // supports reporting values greater than 4 GiB. To keep the
  81                 // code working also on older Windows versions, use
  82                 // GlobalMemoryStatusEx() conditionally.
  83                 HMODULE kernel32 = GetModuleHandle("kernel32.dll");
  84                 if (kernel32 != NULL) {
  85                         BOOL (WINAPI *gmse)(LPMEMORYSTATUSEX) = GetProcAddress(
  86                                         kernel32, "GlobalMemoryStatusEx");
  87                         if (gmse != NULL) {
  88                                 MEMORYSTATUSEX meminfo;
  89                                 meminfo.dwLength = sizeof(meminfo);
  90                                 if (gmse(&meminfo))
  91                                         ret = meminfo.ullTotalPhys;
  92                         }
  93                 }
  94         }
  95
  96         if (ret == 0) {
  97                 // GlobalMemoryStatus() is supported by Windows 95 and later,
  98                 // so it is fine to link against it unconditionally. Note that
  99                 // GlobalMemoryStatus() has no return value.
 100                 MEMORYSTATUS meminfo;
 101                 meminfo.dwLength = sizeof(meminfo);
 102                 GlobalMemoryStatus(&meminfo);
 103                 ret = meminfo.dwTotalPhys;
 104         }
 105
 106 #elif defined(__OS2__)
 107         unsigned long mem;
 108         if (DosQuerySysInfo(QSV_TOTPHYSMEM, QSV_TOTPHYSMEM,
 109                         &mem, sizeof(mem)) == 0)
 110                 ret = mem;
 111
 112 #elif defined(__DJGPP__)
 113         __dpmi_free_mem_info meminfo;
 114         if (__dpmi_get_free_memory_information(&meminfo) == 0
 115                         && meminfo.total_number_of_physical_pages
 116                                 != (unsigned long)-1)
 117                 ret = (uint64_t)meminfo.total_number_of_physical_pages * 4096;
 118
 119 #elif defined(__VMS)
 120         int vms_mem;
 121         int val = SYI$_MEMSIZE;
 122         if (LIB$GETSYI(&val, &vms_mem, 0, 0, 0, 0) == SS$_NORMAL)
 123                 ret = (uint64_t)vms_mem * 8192;
 124
 125 #elif defined(TUKLIB_PHYSMEM_AIX)
 126         ret = _system_configuration.physmem;
 127
 128 #elif defined(TUKLIB_PHYSMEM_SYSCONF)
 129         const long pagesize = sysconf(_SC_PAGESIZE);
 130         const long pages = sysconf(_SC_PHYS_PAGES);
 131         if (pagesize != -1 && pages != -1)
 132                 // According to docs, pagesize * pages can overflow.
 133                 // Simple case is 32-bit box with 4 GiB or more RAM,
 134                 // which may report exactly 4 GiB of RAM, and "long"
 135                 // being 32-bit will overflow. Casting to uint64_t
 136                 // hopefully avoids overflows in the near future.
 137                 ret = (uint64_t)pagesize * (uint64_t)pages;
 138
 139 #elif defined(TUKLIB_PHYSMEM_SYSCTL)
 140         int name[2] = {
 141                 CTL_HW,
 142 #ifdef HW_PHYSMEM64
 143                 HW_PHYSMEM64
 144 #else
 145                 HW_PHYSMEM
 146 #endif
 147         };
 148         union {
 149                 uint32_t u32;
 150                 uint64_t u64;
 151         } mem;
 152         size_t mem_ptr_size = sizeof(mem.u64);
 153         if (sysctl(name, 2, &mem.u64, &mem_ptr_size, NULL, 0) != -1) {
 154                 // IIRC, 64-bit "return value" is possible on some 64-bit
 155                 // BSD systems even with HW_PHYSMEM (instead of HW_PHYSMEM64),
 156                 // so support both.
 157                 if (mem_ptr_size == sizeof(mem.u64))
 158                         ret = mem.u64;
 159                 else if (mem_ptr_size == sizeof(mem.u32))
 160                         ret = mem.u32;
 161         }
 162
 163 #elif defined(TUKLIB_PHYSMEM_GETSYSINFO)
 164         // Docs are unclear if "start" is needed, but it doesn't hurt
 165         // much to have it.
 166         int memkb;
 167         int start = 0;
 168         if (getsysinfo(GSI_PHYSMEM, (caddr_t)&memkb, sizeof(memkb), &start)
 169                         != -1)
 170                 ret = (uint64_t)memkb * 1024;
 171
 172 #elif defined(TUKLIB_PHYSMEM_PSTAT_GETSTATIC)
 173         struct pst_static pst;
 174         if (pstat_getstatic(&pst, sizeof(pst), 1, 0) != -1)
 175                 ret = (uint64_t)pst.physical_memory * (uint64_t)pst.page_size;
 176
 177 #elif defined(TUKLIB_PHYSMEM_GETINVENT_R)
 178         inv_state_t *st = NULL;
 179         if (setinvent_r(&st) != -1) {
 180                 inventory_t *i;
 181                 while ((i = getinvent_r(st)) != NULL) {
 182                         if (i->inv_class == INV_MEMORY
 183                                         && i->inv_type == INV_MAIN_MB) {
 184                                 ret = (uint64_t)i->inv_state << 20;
 185                                 break;
 186                         }
 187                 }
 188
 189                 endinvent_r(st);
 190         }
 191
 192 #elif defined(TUKLIB_PHYSMEM_SYSINFO)
 193         struct sysinfo si;
 194         if (sysinfo(&si) == 0)
 195                 ret = (uint64_t)si.totalram * si.mem_unit;
 196 #endif
 197
 198         return ret;
 199 #endif
 200 }