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
tuklib_physmem(void)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 }
221