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>
36 #include "qemu-common.h"
40 #define WIN32_LEAN_AND_MEAN
48 #include "qemu_socket.h"
51 void *qemu_memalign(size_t alignment, size_t size)
53 return VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE);
56 void *qemu_vmalloc(size_t size)
58 /* FIXME: this is not exactly optimal solution since VirtualAlloc
59 has 64Kb granularity, but at least it guarantees us that the
60 memory is page aligned. */
61 return VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE);
64 void qemu_vfree(void *ptr)
66 VirtualFree(ptr, 0, MEM_RELEASE);
69 long qemu_getpagesize(void)
71 SYSTEM_INFO system_info;
73 GetSystemInfo(&system_info);
74 return system_info.dwPageSize;
79 #if defined(USE_KQEMU)
82 #include <sys/param.h>
83 #include <sys/types.h>
84 #include <sys/mount.h>
92 static void *kqemu_vmalloc(size_t size)
94 static int phys_ram_fd = -1;
95 static int phys_ram_size = 0;
98 #ifdef __OpenBSD__ /* no need (?) for a dummy file on OpenBSD */
99 int map_anon = MAP_ANON;
103 char phys_ram_file[1024];
110 if (phys_ram_fd < 0) {
111 tmpdir = getenv("QEMU_TMPDIR");
115 if (statvfs(tmpdir, &stfs) == 0) {
118 if (statfs(tmpdir, &stfs) == 0) {
123 free_space = (int64_t)stfs.f_bavail * stfs.f_bsize;
124 if ((ram_size + 8192 * 1024) >= free_space) {
125 ram_mb = (ram_size / (1024 * 1024));
127 "You do not have enough space in '%s' for the %d MB of QEMU virtual RAM.\n",
129 if (strcmp(tmpdir, "/dev/shm") == 0) {
130 fprintf(stderr, "To have more space available provided you have enough RAM and swap, do as root:\n"
131 "mount -o remount,size=%dm /dev/shm\n",
135 "Use the '-m' option of QEMU to diminish the amount of virtual RAM or use the\n"
136 "QEMU_TMPDIR environment variable to set another directory where the QEMU\n"
137 "temporary RAM file will be opened.\n");
139 fprintf(stderr, "Or disable the accelerator module with -no-kqemu\n");
143 snprintf(phys_ram_file, sizeof(phys_ram_file), "%s/qemuXXXXXX",
145 phys_ram_fd = mkstemp(phys_ram_file);
146 if (phys_ram_fd < 0) {
148 "warning: could not create temporary file in '%s'.\n"
149 "Use QEMU_TMPDIR to select a directory in a tmpfs filesystem.\n"
150 "Using '/tmp' as fallback.\n",
152 snprintf(phys_ram_file, sizeof(phys_ram_file), "%s/qemuXXXXXX",
154 phys_ram_fd = mkstemp(phys_ram_file);
155 if (phys_ram_fd < 0) {
156 fprintf(stderr, "Could not create temporary memory file '%s'\n",
161 unlink(phys_ram_file);
163 size = (size + 4095) & ~4095;
164 ftruncate(phys_ram_fd, phys_ram_size + size);
165 #endif /* !__OpenBSD__ */
168 PROT_WRITE | PROT_READ, map_anon | MAP_SHARED,
169 phys_ram_fd, phys_ram_size);
170 if (ptr == MAP_FAILED) {
171 fprintf(stderr, "Could not map physical memory\n");
174 phys_ram_size += size;
178 static void kqemu_vfree(void *ptr)
180 /* may be useful some day, but currently we do not need to free */
185 void *qemu_memalign(size_t alignment, size_t size)
187 #if defined(_POSIX_C_SOURCE)
190 ret = posix_memalign(&ptr, alignment, size);
197 return memalign(alignment, size);
201 long qemu_getpagesize(void)
203 return sysconf(_SC_PAGESIZE);
206 /* alloc shared memory pages */
207 void *qemu_vmalloc(size_t size)
209 #if defined(USE_KQEMU)
211 return kqemu_vmalloc(size);
216 return memalign(4096, size);
220 void qemu_vfree(void *ptr)
222 #if defined(USE_KQEMU)
231 int qemu_create_pidfile(const char *filename)
238 fd = open(filename, O_RDWR | O_CREAT, 0600);
242 if (lockf(fd, F_TLOCK, 0) == -1)
245 len = snprintf(buffer, sizeof(buffer), "%ld\n", (long)getpid());
246 if (write(fd, buffer, len) != len)
254 /* Open for writing with no sharing. */
255 file = CreateFile(filename, GENERIC_WRITE, 0, NULL,
256 OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
258 if (file == INVALID_HANDLE_VALUE)
261 flags = LOCKFILE_EXCLUSIVE_LOCK | LOCKFILE_FAIL_IMMEDIATELY;
264 ret = LockFileEx(file, flags, 0, 0, 1, &overlap);
268 /* Write PID to file. */
269 len = snprintf(buffer, sizeof(buffer), "%ld\n", (long)getpid());
270 ret = WriteFileEx(file, (LPCVOID)buffer, (DWORD)len,
280 /* Offset between 1/1/1601 and 1/1/1970 in 100 nanosec units */
281 #define _W32_FT_OFFSET (116444736000000000ULL)
283 int qemu_gettimeofday(qemu_timeval *tp)
286 unsigned long long ns100; /*time since 1 Jan 1601 in 100ns units */
292 GetSystemTimeAsFileTime (&_now.ft);
293 tp->tv_usec=(long)((_now.ns100 / 10ULL) % 1000000ULL );
294 tp->tv_sec= (long)((_now.ns100 - _W32_FT_OFFSET) / 10000000ULL);
296 /* Always return 0 as per Open Group Base Specifications Issue 6.
297 Do not set errno on error. */
304 void socket_set_nonblock(int fd)
306 unsigned long opt = 1;
307 ioctlsocket(fd, FIONBIO, &opt);
310 int inet_aton(const char *cp, struct in_addr *ia)
312 uint32_t addr = inet_addr(cp);
313 if (addr == 0xffffffff)
319 void socket_set_nonblock(int fd)
322 f = fcntl(fd, F_GETFL);
323 fcntl(fd, F_SETFL, f | O_NONBLOCK);