2 * QEMU low level functions
4 * Copyright (c) 2003 Fabrice Bellard
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
32 #include <sys/types.h>
33 #include <sys/statvfs.h>
37 #define WIN32_LEAN_AND_MEAN
45 #include "qemu-common.h"
47 #include "qemu_socket.h"
50 void *qemu_memalign(size_t alignment, size_t size)
52 return VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE);
55 void *qemu_vmalloc(size_t size)
57 /* FIXME: this is not exactly optimal solution since VirtualAlloc
58 has 64Kb granularity, but at least it guarantees us that the
59 memory is page aligned. */
60 return VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE);
63 void qemu_vfree(void *ptr)
65 VirtualFree(ptr, 0, MEM_RELEASE);
70 #if defined(USE_KQEMU)
73 #include <sys/param.h>
74 #include <sys/types.h>
75 #include <sys/mount.h>
85 static void *kqemu_vmalloc(size_t size)
87 static int phys_ram_fd = -1;
88 static int phys_ram_size = 0;
91 /* no need (?) for a dummy file on OpenBSD/FreeBSD */
92 #if defined(__OpenBSD__) || defined(__FreeBSD__)
93 int map_anon = MAP_ANON;
97 char phys_ram_file[1024];
104 if (phys_ram_fd < 0) {
105 tmpdir = getenv("QEMU_TMPDIR");
109 if (statvfs(tmpdir, &stfs) == 0) {
112 if (statfs(tmpdir, &stfs) == 0) {
117 free_space = (int64_t)stfs.f_bavail * stfs.f_bsize;
118 if ((ram_size + 8192 * 1024) >= free_space) {
119 ram_mb = (ram_size / (1024 * 1024));
121 "You do not have enough space in '%s' for the %d MB of QEMU virtual RAM.\n",
123 if (strcmp(tmpdir, "/dev/shm") == 0) {
124 fprintf(stderr, "To have more space available provided you have enough RAM and swap, do as root:\n"
125 "mount -o remount,size=%dm /dev/shm\n",
129 "Use the '-m' option of QEMU to diminish the amount of virtual RAM or use the\n"
130 "QEMU_TMPDIR environment variable to set another directory where the QEMU\n"
131 "temporary RAM file will be opened.\n");
133 fprintf(stderr, "Or disable the accelerator module with -no-kqemu\n");
137 snprintf(phys_ram_file, sizeof(phys_ram_file), "%s/qemuXXXXXX",
139 phys_ram_fd = mkstemp(phys_ram_file);
140 if (phys_ram_fd < 0) {
142 "warning: could not create temporary file in '%s'.\n"
143 "Use QEMU_TMPDIR to select a directory in a tmpfs filesystem.\n"
144 "Using '/tmp' as fallback.\n",
146 snprintf(phys_ram_file, sizeof(phys_ram_file), "%s/qemuXXXXXX",
148 phys_ram_fd = mkstemp(phys_ram_file);
149 if (phys_ram_fd < 0) {
150 fprintf(stderr, "Could not create temporary memory file '%s'\n",
155 unlink(phys_ram_file);
157 size = (size + 4095) & ~4095;
158 ftruncate(phys_ram_fd, phys_ram_size + size);
159 #endif /* !(__OpenBSD__ || __FreeBSD__) */
162 PROT_WRITE | PROT_READ, map_anon | MAP_SHARED,
163 phys_ram_fd, phys_ram_size);
164 if (ptr == MAP_FAILED) {
165 fprintf(stderr, "Could not map physical memory\n");
168 phys_ram_size += size;
172 static void kqemu_vfree(void *ptr)
174 /* may be useful some day, but currently we do not need to free */
179 void *qemu_memalign(size_t alignment, size_t size)
181 #if defined(_POSIX_C_SOURCE)
184 ret = posix_memalign(&ptr, alignment, size);
191 return memalign(alignment, size);
195 /* alloc shared memory pages */
196 void *qemu_vmalloc(size_t size)
198 #if defined(USE_KQEMU)
200 return kqemu_vmalloc(size);
202 return qemu_memalign(getpagesize(), size);
205 void qemu_vfree(void *ptr)
207 #if defined(USE_KQEMU)
216 int qemu_create_pidfile(const char *filename)
223 fd = open(filename, O_RDWR | O_CREAT, 0600);
227 if (lockf(fd, F_TLOCK, 0) == -1)
230 len = snprintf(buffer, sizeof(buffer), "%ld\n", (long)getpid());
231 if (write(fd, buffer, len) != len)
239 /* Open for writing with no sharing. */
240 file = CreateFile(filename, GENERIC_WRITE, 0, NULL,
241 OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
243 if (file == INVALID_HANDLE_VALUE)
246 flags = LOCKFILE_EXCLUSIVE_LOCK | LOCKFILE_FAIL_IMMEDIATELY;
249 ret = LockFileEx(file, flags, 0, 0, 1, &overlap);
253 /* Write PID to file. */
254 len = snprintf(buffer, sizeof(buffer), "%ld\n", (long)getpid());
255 ret = WriteFileEx(file, (LPCVOID)buffer, (DWORD)len,
265 /* Offset between 1/1/1601 and 1/1/1970 in 100 nanosec units */
266 #define _W32_FT_OFFSET (116444736000000000ULL)
268 int qemu_gettimeofday(qemu_timeval *tp)
271 unsigned long long ns100; /*time since 1 Jan 1601 in 100ns units */
277 GetSystemTimeAsFileTime (&_now.ft);
278 tp->tv_usec=(long)((_now.ns100 / 10ULL) % 1000000ULL );
279 tp->tv_sec= (long)((_now.ns100 - _W32_FT_OFFSET) / 10000000ULL);
281 /* Always return 0 as per Open Group Base Specifications Issue 6.
282 Do not set errno on error. */
289 void socket_set_nonblock(int fd)
291 unsigned long opt = 1;
292 ioctlsocket(fd, FIONBIO, &opt);
295 int inet_aton(const char *cp, struct in_addr *ia)
297 uint32_t addr = inet_addr(cp);
298 if (addr == 0xffffffff)
304 void socket_set_nonblock(int fd)
307 f = fcntl(fd, F_GETFL);
308 fcntl(fd, F_SETFL, f | O_NONBLOCK);