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 }
204