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 /* Needed early for HOST_BSD etc. */
37 #include "config-host.h"
40 #define WIN32_LEAN_AND_MEAN
42 #elif defined(HOST_BSD)
48 #include "qemu-common.h"
50 #include "qemu_socket.h"
53 void *qemu_memalign(size_t alignment, size_t size)
55 return VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE);
58 void *qemu_vmalloc(size_t size)
60 /* FIXME: this is not exactly optimal solution since VirtualAlloc
61 has 64Kb granularity, but at least it guarantees us that the
62 memory is page aligned. */
63 return VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE);
66 void qemu_vfree(void *ptr)
68 VirtualFree(ptr, 0, MEM_RELEASE);
73 #if defined(USE_KQEMU)
76 #include <sys/param.h>
77 #include <sys/types.h>
78 #include <sys/mount.h>
88 static void *kqemu_vmalloc(size_t size)
90 static int phys_ram_fd = -1;
91 static int phys_ram_size = 0;
94 /* no need (?) for a dummy file on OpenBSD/FreeBSD */
95 #if defined(__OpenBSD__) || defined(__FreeBSD__) || defined(__DragonFly__)
96 int map_anon = MAP_ANON;
100 char phys_ram_file[1024];
107 if (phys_ram_fd < 0) {
108 tmpdir = getenv("QEMU_TMPDIR");
112 if (statvfs(tmpdir, &stfs) == 0) {
115 if (statfs(tmpdir, &stfs) == 0) {
120 free_space = (int64_t)stfs.f_bavail * stfs.f_bsize;
121 if ((ram_size + 8192 * 1024) >= free_space) {
122 ram_mb = (ram_size / (1024 * 1024));
124 "You do not have enough space in '%s' for the %d MB of QEMU virtual RAM.\n",
126 if (strcmp(tmpdir, "/dev/shm") == 0) {
127 fprintf(stderr, "To have more space available provided you have enough RAM and swap, do as root:\n"
128 "mount -o remount,size=%dm /dev/shm\n",
132 "Use the '-m' option of QEMU to diminish the amount of virtual RAM or use the\n"
133 "QEMU_TMPDIR environment variable to set another directory where the QEMU\n"
134 "temporary RAM file will be opened.\n");
136 fprintf(stderr, "Or disable the accelerator module with -no-kqemu\n");
140 snprintf(phys_ram_file, sizeof(phys_ram_file), "%s/qemuXXXXXX",
142 phys_ram_fd = mkstemp(phys_ram_file);
143 if (phys_ram_fd < 0) {
145 "warning: could not create temporary file in '%s'.\n"
146 "Use QEMU_TMPDIR to select a directory in a tmpfs filesystem.\n"
147 "Using '/tmp' as fallback.\n",
149 snprintf(phys_ram_file, sizeof(phys_ram_file), "%s/qemuXXXXXX",
151 phys_ram_fd = mkstemp(phys_ram_file);
152 if (phys_ram_fd < 0) {
153 fprintf(stderr, "Could not create temporary memory file '%s'\n",
158 unlink(phys_ram_file);
160 size = (size + 4095) & ~4095;
161 ftruncate(phys_ram_fd, phys_ram_size + size);
162 #endif /* !(__OpenBSD__ || __FreeBSD__ || __DragonFly__) */
165 PROT_WRITE | PROT_READ, map_anon | MAP_SHARED,
166 phys_ram_fd, phys_ram_size);
167 if (ptr == MAP_FAILED) {
168 fprintf(stderr, "Could not map physical memory\n");
171 phys_ram_size += size;
175 static void kqemu_vfree(void *ptr)
177 /* may be useful some day, but currently we do not need to free */
182 void *qemu_memalign(size_t alignment, size_t size)
184 #if defined(_POSIX_C_SOURCE)
187 ret = posix_memalign(&ptr, alignment, size);
191 #elif defined(HOST_BSD)
194 return memalign(alignment, size);
198 /* alloc shared memory pages */
199 void *qemu_vmalloc(size_t size)
201 #if defined(USE_KQEMU)
203 return kqemu_vmalloc(size);
205 return qemu_memalign(getpagesize(), size);
208 void qemu_vfree(void *ptr)
210 #if defined(USE_KQEMU)
219 int qemu_create_pidfile(const char *filename)
226 fd = open(filename, O_RDWR | O_CREAT, 0600);
230 if (lockf(fd, F_TLOCK, 0) == -1)
233 len = snprintf(buffer, sizeof(buffer), "%ld\n", (long)getpid());
234 if (write(fd, buffer, len) != len)
242 /* Open for writing with no sharing. */
243 file = CreateFile(filename, GENERIC_WRITE, 0, NULL,
244 OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
246 if (file == INVALID_HANDLE_VALUE)
249 flags = LOCKFILE_EXCLUSIVE_LOCK | LOCKFILE_FAIL_IMMEDIATELY;
252 ret = LockFileEx(file, flags, 0, 0, 1, &overlap);
256 /* Write PID to file. */
257 len = snprintf(buffer, sizeof(buffer), "%ld\n", (long)getpid());
258 ret = WriteFileEx(file, (LPCVOID)buffer, (DWORD)len,
268 /* Offset between 1/1/1601 and 1/1/1970 in 100 nanosec units */
269 #define _W32_FT_OFFSET (116444736000000000ULL)
271 int qemu_gettimeofday(qemu_timeval *tp)
274 unsigned long long ns100; /*time since 1 Jan 1601 in 100ns units */
280 GetSystemTimeAsFileTime (&_now.ft);
281 tp->tv_usec=(long)((_now.ns100 / 10ULL) % 1000000ULL );
282 tp->tv_sec= (long)((_now.ns100 - _W32_FT_OFFSET) / 10000000ULL);
284 /* Always return 0 as per Open Group Base Specifications Issue 6.
285 Do not set errno on error. */
292 void socket_set_nonblock(int fd)
294 unsigned long opt = 1;
295 ioctlsocket(fd, FIONBIO, &opt);
298 int inet_aton(const char *cp, struct in_addr *ia)
300 uint32_t addr = inet_addr(cp);
301 if (addr == 0xffffffff)
307 void socket_set_nonblock(int fd)
310 f = fcntl(fd, F_GETFL);
311 fcntl(fd, F_SETFL, f | O_NONBLOCK);