contrib/xz/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 #elif defined(__QNX__)
  41 #       include <sys/syspage.h>
  42 #       include <string.h>
  43
  44 #elif defined(TUKLIB_PHYSMEM_AIX)
  45 #       include <sys/systemcfg.h>
  46
  47 #elif defined(TUKLIB_PHYSMEM_SYSCONF)
  48 #       include <limits.h>
  49 #       include <unistd.h>
  50
  51 #elif defined(TUKLIB_PHYSMEM_SYSCTL)
  52 #       ifdef HAVE_SYS_PARAM_H
  53 #               include <sys/param.h>
  54 #       endif
  55 #       include <sys/sysctl.h>
  56
  57 // Tru64
  58 #elif defined(TUKLIB_PHYSMEM_GETSYSINFO)
  59 #       include <sys/sysinfo.h>
  60 #       include <machine/hal_sysinfo.h>
  61
  62 // HP-UX
  63 #elif defined(TUKLIB_PHYSMEM_PSTAT_GETSTATIC)
  64 #       include <sys/param.h>
  65 #       include <sys/pstat.h>
  66
  67 // IRIX
  68 #elif defined(TUKLIB_PHYSMEM_GETINVENT_R)
  69 #       include <invent.h>
  70
  71 // This sysinfo() is Linux-specific.
  72 #elif defined(TUKLIB_PHYSMEM_SYSINFO)
  73 #       include <sys/sysinfo.h>
  74 #endif
  75
  76
  77 extern uint64_t
  78 tuklib_physmem(void)
  79 {
  80         uint64_t ret = 0;
  81
  82 #if defined(_WIN32) || defined(__CYGWIN__)
  83         if ((GetVersion() & 0xFF) >= 5) {
  84                 // Windows 2000 and later have GlobalMemoryStatusEx() which
  85                 // supports reporting values greater than 4 GiB. To keep the
  86                 // code working also on older Windows versions, use
  87                 // GlobalMemoryStatusEx() conditionally.
  88                 HMODULE kernel32 = GetModuleHandle("kernel32.dll");
  89                 if (kernel32 != NULL) {
  90                         typedef BOOL (WINAPI *gmse_type)(LPMEMORYSTATUSEX);
  91                         gmse_type gmse = (gmse_type)GetProcAddress(
  92                                         kernel32, "GlobalMemoryStatusEx");
  93                         if (gmse != NULL) {
  94                                 MEMORYSTATUSEX meminfo;
  95                                 meminfo.dwLength = sizeof(meminfo);
  96                                 if (gmse(&meminfo))
  97                                         ret = meminfo.ullTotalPhys;
  98                         }
  99                 }
 100         }
 101
 102         if (ret == 0) {
 103                 // GlobalMemoryStatus() is supported by Windows 95 and later,
 104                 // so it is fine to link against it unconditionally. Note that
 105                 // GlobalMemoryStatus() has no return value.
 106                 MEMORYSTATUS meminfo;
 107                 meminfo.dwLength = sizeof(meminfo);
 108                 GlobalMemoryStatus(&meminfo);
 109                 ret = meminfo.dwTotalPhys;
 110         }
 111
 112 #elif defined(__OS2__)
 113         unsigned long mem;
 114         if (DosQuerySysInfo(QSV_TOTPHYSMEM, QSV_TOTPHYSMEM,
 115                         &mem, sizeof(mem)) == 0)
 116                 ret = mem;
 117
 118 #elif defined(__DJGPP__)
 119         __dpmi_free_mem_info meminfo;
 120         if (__dpmi_get_free_memory_information(&meminfo) == 0
 121                         && meminfo.total_number_of_physical_pages
 122                                 != (unsigned long)-1)
 123                 ret = (uint64_t)meminfo.total_number_of_physical_pages * 4096;
 124
 125 #elif defined(__VMS)
 126         int vms_mem;
 127         int val = SYI$_MEMSIZE;
 128         if (LIB$GETSYI(&val, &vms_mem, 0, 0, 0, 0) == SS$_NORMAL)
 129                 ret = (uint64_t)vms_mem * 8192;
 130
 131 #elif defined(AMIGA) || defined(__AROS__)
 132         ret = AvailMem(MEMF_TOTAL);
 133
 134 #elif defined(__QNX__)
 135         const struct asinfo_entry *entries = SYSPAGE_ENTRY(asinfo);
 136         size_t count = SYSPAGE_ENTRY_SIZE(asinfo) / sizeof(struct asinfo_entry);
 137         const char *strings = SYSPAGE_ENTRY(strings)->data;
 138
 139         for (size_t i = 0; i < count; ++i)
 140                 if (strcmp(strings + entries[i].name, "ram") == 0)
 141                         ret += entries[i].end - entries[i].start + 1;
 142
 143 #elif defined(TUKLIB_PHYSMEM_AIX)
 144         ret = _system_configuration.physmem;
 145
 146 #elif defined(TUKLIB_PHYSMEM_SYSCONF)
 147         const long pagesize = sysconf(_SC_PAGESIZE);
 148         const long pages = sysconf(_SC_PHYS_PAGES);
 149         if (pagesize != -1 && pages != -1) {
 150                 // According to docs, pagesize * pages can overflow.
 151                 // Simple case is 32-bit box with 4 GiB or more RAM,
 152                 // which may report exactly 4 GiB of RAM, and "long"
 153                 // being 32-bit will overflow. Casting to uint64_t
 154                 // hopefully avoids overflows in the near future.
 155                 ret = (uint64_t)pagesize * (uint64_t)pages;
 156                 if (ret > SIZE_T_MAX)
 157                         ret = SIZE_T_MAX;
 158         }
 159
 160 #elif defined(TUKLIB_PHYSMEM_SYSCTL)
 161         int name[2] = {
 162                 CTL_HW,
 163 #ifdef HW_PHYSMEM64
 164                 HW_PHYSMEM64
 165 #else
 166                 HW_PHYSMEM
 167 #endif
 168         };
 169         union {
 170                 uint32_t u32;
 171                 uint64_t u64;
 172         } mem;
 173         size_t mem_ptr_size = sizeof(mem.u64);
 174         if (sysctl(name, 2, &mem.u64, &mem_ptr_size, NULL, 0) != -1) {
 175                 // IIRC, 64-bit "return value" is possible on some 64-bit
 176                 // BSD systems even with HW_PHYSMEM (instead of HW_PHYSMEM64),
 177                 // so support both.
 178                 if (mem_ptr_size == sizeof(mem.u64))
 179                         ret = mem.u64;
 180                 else if (mem_ptr_size == sizeof(mem.u32))
 181                         ret = mem.u32;
 182         }
 183
 184 #elif defined(TUKLIB_PHYSMEM_GETSYSINFO)
 185         // Docs are unclear if "start" is needed, but it doesn't hurt
 186         // much to have it.
 187         int memkb;
 188         int start = 0;
 189         if (getsysinfo(GSI_PHYSMEM, (caddr_t)&memkb, sizeof(memkb), &start)
 190                         != -1)
 191                 ret = (uint64_t)memkb * 1024;
 192
 193 #elif defined(TUKLIB_PHYSMEM_PSTAT_GETSTATIC)
 194         struct pst_static pst;
 195         if (pstat_getstatic(&pst, sizeof(pst), 1, 0) != -1)
 196                 ret = (uint64_t)pst.physical_memory * (uint64_t)pst.page_size;
 197
 198 #elif defined(TUKLIB_PHYSMEM_GETINVENT_R)
 199         inv_state_t *st = NULL;
 200         if (setinvent_r(&st) != -1) {
 201                 inventory_t *i;
 202                 while ((i = getinvent_r(st)) != NULL) {
 203                         if (i->inv_class == INV_MEMORY
 204                                         && i->inv_type == INV_MAIN_MB) {
 205                                 ret = (uint64_t)i->inv_state << 20;
 206                                 break;
 207                         }
 208                 }
 209
 210                 endinvent_r(st);
 211         }
 212
 213 #elif defined(TUKLIB_PHYSMEM_SYSINFO)
 214         struct sysinfo si;
 215         if (sysinfo(&si) == 0)
 216                 ret = (uint64_t)si.totalram * si.mem_unit;
 217 #endif
 218
 219         return ret;
 220 }