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 #elif defined(AMIGA) || defined(__AROS__)
  37 #       define __USE_INLINE__
  38 #       include <proto/exec.h>
  39
  40 // AIX
  41 #elif defined(TUKLIB_PHYSMEM_AIX)
  42 #       include <sys/systemcfg.h>
  43
  44 #elif defined(TUKLIB_PHYSMEM_SYSCONF)
  45 #       include <unistd.h>
  46
  47 #elif defined(TUKLIB_PHYSMEM_SYSCTL)
  48 #       ifdef HAVE_SYS_PARAM_H
  49 #               include <sys/param.h>
  50 #       endif
  51 #       include <sys/sysctl.h>
  52
  53 // Tru64
  54 #elif defined(TUKLIB_PHYSMEM_GETSYSINFO)
  55 #       include <sys/sysinfo.h>
  56 #       include <machine/hal_sysinfo.h>
  57
  58 // HP-UX
  59 #elif defined(TUKLIB_PHYSMEM_PSTAT_GETSTATIC)
  60 #       include <sys/param.h>
  61 #       include <sys/pstat.h>
  62
  63 // IRIX
  64 #elif defined(TUKLIB_PHYSMEM_GETINVENT_R)
  65 #       include <invent.h>
  66
  67 // This sysinfo() is Linux-specific.
  68 #elif defined(TUKLIB_PHYSMEM_SYSINFO)
  69 #       include <sys/sysinfo.h>
  70 #endif
  71
  72
  73 extern uint64_t
  74 tuklib_physmem(void)
  75 {
  76         uint64_t ret = 0;
  77
  78 #if defined(_WIN32) || defined(__CYGWIN__)
  79         if ((GetVersion() & 0xFF) >= 5) {
  80                 // Windows 2000 and later have GlobalMemoryStatusEx() which
  81                 // supports reporting values greater than 4 GiB. To keep the
  82                 // code working also on older Windows versions, use
  83                 // GlobalMemoryStatusEx() conditionally.
  84                 HMODULE kernel32 = GetModuleHandle("kernel32.dll");
  85                 if (kernel32 != NULL) {
  86                         BOOL (WINAPI *gmse)(LPMEMORYSTATUSEX) = GetProcAddress(
  87                                         kernel32, "GlobalMemoryStatusEx");
  88                         if (gmse != NULL) {
  89                                 MEMORYSTATUSEX meminfo;
  90                                 meminfo.dwLength = sizeof(meminfo);
  91                                 if (gmse(&meminfo))
  92                                         ret = meminfo.ullTotalPhys;
  93                         }
  94                 }
  95         }
  96
  97         if (ret == 0) {
  98                 // GlobalMemoryStatus() is supported by Windows 95 and later,
  99                 // so it is fine to link against it unconditionally. Note that
 100                 // GlobalMemoryStatus() has no return value.
 101                 MEMORYSTATUS meminfo;
 102                 meminfo.dwLength = sizeof(meminfo);
 103                 GlobalMemoryStatus(&meminfo);
 104                 ret = meminfo.dwTotalPhys;
 105         }
 106
 107 #elif defined(__OS2__)
 108         unsigned long mem;
 109         if (DosQuerySysInfo(QSV_TOTPHYSMEM, QSV_TOTPHYSMEM,
 110                         &mem, sizeof(mem)) == 0)
 111                 ret = mem;
 112
 113 #elif defined(__DJGPP__)
 114         __dpmi_free_mem_info meminfo;
 115         if (__dpmi_get_free_memory_information(&meminfo) == 0
 116                         && meminfo.total_number_of_physical_pages
 117                                 != (unsigned long)-1)
 118                 ret = (uint64_t)meminfo.total_number_of_physical_pages * 4096;
 119
 120 #elif defined(__VMS)
 121         int vms_mem;
 122         int val = SYI$_MEMSIZE;
 123         if (LIB$GETSYI(&val, &vms_mem, 0, 0, 0, 0) == SS$_NORMAL)
 124                 ret = (uint64_t)vms_mem * 8192;
 125
 126 #elif defined(AMIGA) || defined(__AROS__)
 127         ret = AvailMem(MEMF_TOTAL);
 128
 129 #elif defined(TUKLIB_PHYSMEM_AIX)
 130         ret = _system_configuration.physmem;
 131
 132 #elif defined(TUKLIB_PHYSMEM_SYSCONF)
 133         const long pagesize = sysconf(_SC_PAGESIZE);
 134         const long pages = sysconf(_SC_PHYS_PAGES);
 135         if (pagesize != -1 && pages != -1)
 136                 // According to docs, pagesize * pages can overflow.
 137                 // Simple case is 32-bit box with 4 GiB or more RAM,
 138                 // which may report exactly 4 GiB of RAM, and "long"
 139                 // being 32-bit will overflow. Casting to uint64_t
 140                 // hopefully avoids overflows in the near future.
 141                 ret = (uint64_t)pagesize * (uint64_t)pages;
 142
 143 #elif defined(TUKLIB_PHYSMEM_SYSCTL)
 144         int name[2] = {
 145                 CTL_HW,
 146 #ifdef HW_PHYSMEM64
 147                 HW_PHYSMEM64
 148 #else
 149                 HW_PHYSMEM
 150 #endif
 151         };
 152         union {
 153                 uint32_t u32;
 154                 uint64_t u64;
 155         } mem;
 156         size_t mem_ptr_size = sizeof(mem.u64);
 157         if (sysctl(name, 2, &mem.u64, &mem_ptr_size, NULL, 0) != -1) {
 158                 // IIRC, 64-bit "return value" is possible on some 64-bit
 159                 // BSD systems even with HW_PHYSMEM (instead of HW_PHYSMEM64),
 160                 // so support both.
 161                 if (mem_ptr_size == sizeof(mem.u64))
 162                         ret = mem.u64;
 163                 else if (mem_ptr_size == sizeof(mem.u32))
 164                         ret = mem.u32;
 165         }
 166
 167 #elif defined(TUKLIB_PHYSMEM_GETSYSINFO)
 168         // Docs are unclear if "start" is needed, but it doesn't hurt
 169         // much to have it.
 170         int memkb;
 171         int start = 0;
 172         if (getsysinfo(GSI_PHYSMEM, (caddr_t)&memkb, sizeof(memkb), &start)
 173                         != -1)
 174                 ret = (uint64_t)memkb * 1024;
 175
 176 #elif defined(TUKLIB_PHYSMEM_PSTAT_GETSTATIC)
 177         struct pst_static pst;
 178         if (pstat_getstatic(&pst, sizeof(pst), 1, 0) != -1)
 179                 ret = (uint64_t)pst.physical_memory * (uint64_t)pst.page_size;
 180
 181 #elif defined(TUKLIB_PHYSMEM_GETINVENT_R)
 182         inv_state_t *st = NULL;
 183         if (setinvent_r(&st) != -1) {
 184                 inventory_t *i;
 185                 while ((i = getinvent_r(st)) != NULL) {
 186                         if (i->inv_class == INV_MEMORY
 187                                         && i->inv_type == INV_MAIN_MB) {
 188                                 ret = (uint64_t)i->inv_state << 20;
 189                                 break;
 190                         }
 191                 }
 192
 193                 endinvent_r(st);
 194         }
 195
 196 #elif defined(TUKLIB_PHYSMEM_SYSINFO)
 197         struct sysinfo si;
 198         if (sysinfo(&si) == 0)
 199                 ret = (uint64_t)si.totalram * si.mem_unit;
 200 #endif
 201
 202         return ret;
 203 }