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 void *get_mmap_addr(unsigned long size)
53 void qemu_free(void *ptr)
58 void *qemu_malloc(size_t size)
65 void *qemu_vmalloc(size_t size)
67 /* FIXME: this is not exactly optimal solution since VirtualAlloc
68 has 64Kb granularity, but at least it guarantees us that the
69 memory is page aligned. */
70 return VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE);
73 void qemu_vfree(void *ptr)
75 VirtualFree(ptr, 0, MEM_RELEASE);
80 #if defined(USE_KQEMU)
86 static void *kqemu_vmalloc(size_t size)
88 static int phys_ram_fd = -1;
89 static int phys_ram_size = 0;
91 char phys_ram_file[1024];
99 if (phys_ram_fd < 0) {
100 tmpdir = getenv("QEMU_TMPDIR");
104 if (statvfs(tmpdir, &stfs) == 0) {
107 if (statfs(tmpdir, &stfs) == 0) {
113 free_space = (int64_t)stfs.f_bavail * stfs.f_bsize;
114 if ((ram_size + 8192 * 1024) >= free_space) {
115 ram_mb = (ram_size / (1024 * 1024));
117 "You do not have enough space in '%s' for the %d MB of QEMU virtual RAM.\n",
119 if (strcmp(tmpdir, "/dev/shm") == 0) {
120 fprintf(stderr, "To have more space available provided you have enough RAM and swap, do as root:\n"
122 "mount -t tmpfs -o size=%dm none /dev/shm\n",
126 "Use the '-m' option of QEMU to diminish the amount of virtual RAM or use the\n"
127 "QEMU_TMPDIR environment variable to set another directory where the QEMU\n"
128 "temporary RAM file will be opened.\n");
130 fprintf(stderr, "Or disable the accelerator module with -no-kqemu\n");
134 snprintf(phys_ram_file, sizeof(phys_ram_file), "%s/qemuXXXXXX",
136 phys_ram_fd = mkstemp(phys_ram_file);
137 if (phys_ram_fd < 0) {
139 "warning: could not create temporary file in '%s'.\n"
140 "Use QEMU_TMPDIR to select a directory in a tmpfs filesystem.\n"
141 "Using '/tmp' as fallback.\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) {
147 fprintf(stderr, "Could not create temporary memory file '%s'\n",
152 unlink(phys_ram_file);
154 size = (size + 4095) & ~4095;
155 ftruncate(phys_ram_fd, phys_ram_size + size);
158 PROT_WRITE | PROT_READ, MAP_SHARED,
159 phys_ram_fd, phys_ram_size);
160 if (ptr == MAP_FAILED) {
161 fprintf(stderr, "Could not map physical memory\n");
164 phys_ram_size += size;
168 static void kqemu_vfree(void *ptr)
170 /* may be useful some day, but currently we do not need to free */
175 /* alloc shared memory pages */
176 void *qemu_vmalloc(size_t size)
178 #if defined(USE_KQEMU)
180 return kqemu_vmalloc(size);
185 return memalign(4096, size);
189 void qemu_vfree(void *ptr)
191 #if defined(USE_KQEMU)
200 void *qemu_mallocz(size_t size)
203 ptr = qemu_malloc(size);
206 memset(ptr, 0, size);
210 char *qemu_strdup(const char *str)
213 ptr = qemu_malloc(strlen(str) + 1);
220 int qemu_create_pidfile(const char *filename)
227 fd = open(filename, O_RDWR | O_CREAT, 0600);
231 if (lockf(fd, F_TLOCK, 0) == -1)
234 len = snprintf(buffer, sizeof(buffer), "%ld\n", (long)getpid());
235 if (write(fd, buffer, len) != len)
243 /* Open for writing with no sharing. */
244 file = CreateFile(filename, GENERIC_WRITE, 0, NULL,
245 OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
247 if (file == INVALID_HANDLE_VALUE)
250 flags = LOCKFILE_EXCLUSIVE_LOCK | LOCKFILE_FAIL_IMMEDIATELY;
253 ret = LockFileEx(file, flags, 0, 0, 1, &overlap);
257 /* Write PID to file. */
258 len = snprintf(buffer, sizeof(buffer), "%ld\n", (long)getpid());
259 ret = WriteFileEx(file, (LPCVOID)buffer, (DWORD)len,
269 /* Offset between 1/1/1601 and 1/1/1970 in 100 nanosec units */
270 #define _W32_FT_OFFSET (116444736000000000ULL)
272 int qemu_gettimeofday(qemu_timeval *tp)
275 unsigned long long ns100; /*time since 1 Jan 1601 in 100ns units */
281 GetSystemTimeAsFileTime (&_now.ft);
282 tp->tv_usec=(long)((_now.ns100 / 10ULL) % 1000000ULL );
283 tp->tv_sec= (long)((_now.ns100 - _W32_FT_OFFSET) / 10000000ULL);
285 /* Always return 0 as per Open Group Base Specifications Issue 6.
286 Do not set errno on error. */