SH4 delay slot code update, by Magnus Damm.
[qemu/qemu_0_9_1_stable.git] / osdep.c
blob00c19ce6e11fd751223c53d687447636665b32bd
1 /*
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
22 * THE SOFTWARE.
24 #include <stdlib.h>
25 #include <stdio.h>
26 #include <stdarg.h>
27 #include <string.h>
28 #include <errno.h>
29 #include <unistd.h>
30 #include <fcntl.h>
31 #ifdef HOST_SOLARIS
32 #include <sys/types.h>
33 #include <sys/statvfs.h>
34 #endif
36 #include "qemu-common.h"
37 #include "sysemu.h"
39 #ifdef _WIN32
40 #include <windows.h>
41 #elif defined(_BSD)
42 #include <stdlib.h>
43 #else
44 #include <malloc.h>
45 #endif
47 void *get_mmap_addr(unsigned long size)
49 return NULL;
52 void qemu_free(void *ptr)
54 free(ptr);
57 void *qemu_malloc(size_t size)
59 return malloc(size);
62 #if defined(_WIN32)
64 void *qemu_vmalloc(size_t size)
66 /* FIXME: this is not exactly optimal solution since VirtualAlloc
67 has 64Kb granularity, but at least it guarantees us that the
68 memory is page aligned. */
69 return VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE);
72 void qemu_vfree(void *ptr)
74 VirtualFree(ptr, 0, MEM_RELEASE);
77 #else
79 #if defined(USE_KQEMU)
81 #include <sys/vfs.h>
82 #include <sys/mman.h>
83 #include <fcntl.h>
85 static void *kqemu_vmalloc(size_t size)
87 static int phys_ram_fd = -1;
88 static int phys_ram_size = 0;
89 const char *tmpdir;
90 char phys_ram_file[1024];
91 void *ptr;
92 #ifdef HOST_SOLARIS
93 struct statvfs stfs;
94 #else
95 struct statfs stfs;
96 #endif
98 if (phys_ram_fd < 0) {
99 tmpdir = getenv("QEMU_TMPDIR");
100 if (!tmpdir)
101 #ifdef HOST_SOLARIS
102 tmpdir = "/tmp";
103 if (statvfs(tmpdir, &stfs) == 0) {
104 #else
105 tmpdir = "/dev/shm";
106 if (statfs(tmpdir, &stfs) == 0) {
107 #endif
108 int64_t free_space;
109 int ram_mb;
111 extern int ram_size;
112 free_space = (int64_t)stfs.f_bavail * stfs.f_bsize;
113 if ((ram_size + 8192 * 1024) >= free_space) {
114 ram_mb = (ram_size / (1024 * 1024));
115 fprintf(stderr,
116 "You do not have enough space in '%s' for the %d MB of QEMU virtual RAM.\n",
117 tmpdir, ram_mb);
118 if (strcmp(tmpdir, "/dev/shm") == 0) {
119 fprintf(stderr, "To have more space available provided you have enough RAM and swap, do as root:\n"
120 "umount /dev/shm\n"
121 "mount -t tmpfs -o size=%dm none /dev/shm\n",
122 ram_mb + 16);
123 } else {
124 fprintf(stderr,
125 "Use the '-m' option of QEMU to diminish the amount of virtual RAM or use the\n"
126 "QEMU_TMPDIR environment variable to set another directory where the QEMU\n"
127 "temporary RAM file will be opened.\n");
129 fprintf(stderr, "Or disable the accelerator module with -no-kqemu\n");
130 exit(1);
133 snprintf(phys_ram_file, sizeof(phys_ram_file), "%s/qemuXXXXXX",
134 tmpdir);
135 phys_ram_fd = mkstemp(phys_ram_file);
136 if (phys_ram_fd < 0) {
137 fprintf(stderr,
138 "warning: could not create temporary file in '%s'.\n"
139 "Use QEMU_TMPDIR to select a directory in a tmpfs filesystem.\n"
140 "Using '/tmp' as fallback.\n",
141 tmpdir);
142 snprintf(phys_ram_file, sizeof(phys_ram_file), "%s/qemuXXXXXX",
143 "/tmp");
144 phys_ram_fd = mkstemp(phys_ram_file);
145 if (phys_ram_fd < 0) {
146 fprintf(stderr, "Could not create temporary memory file '%s'\n",
147 phys_ram_file);
148 exit(1);
151 unlink(phys_ram_file);
153 size = (size + 4095) & ~4095;
154 ftruncate(phys_ram_fd, phys_ram_size + size);
155 ptr = mmap(NULL,
156 size,
157 PROT_WRITE | PROT_READ, MAP_SHARED,
158 phys_ram_fd, phys_ram_size);
159 if (ptr == MAP_FAILED) {
160 fprintf(stderr, "Could not map physical memory\n");
161 exit(1);
163 phys_ram_size += size;
164 return ptr;
167 static void kqemu_vfree(void *ptr)
169 /* may be useful some day, but currently we do not need to free */
172 #endif
174 /* alloc shared memory pages */
175 void *qemu_vmalloc(size_t size)
177 #if defined(USE_KQEMU)
178 if (kqemu_allowed)
179 return kqemu_vmalloc(size);
180 #endif
181 #ifdef _BSD
182 return valloc(size);
183 #else
184 return memalign(4096, size);
185 #endif
188 void qemu_vfree(void *ptr)
190 #if defined(USE_KQEMU)
191 if (kqemu_allowed)
192 kqemu_vfree(ptr);
193 #endif
194 free(ptr);
197 #endif
199 void *qemu_mallocz(size_t size)
201 void *ptr;
202 ptr = qemu_malloc(size);
203 if (!ptr)
204 return NULL;
205 memset(ptr, 0, size);
206 return ptr;
209 char *qemu_strdup(const char *str)
211 char *ptr;
212 ptr = qemu_malloc(strlen(str) + 1);
213 if (!ptr)
214 return NULL;
215 strcpy(ptr, str);
216 return ptr;
219 int qemu_create_pidfile(const char *filename)
221 char buffer[128];
222 int len;
223 #ifndef _WIN32
224 int fd;
226 fd = open(filename, O_RDWR | O_CREAT, 0600);
227 if (fd == -1)
228 return -1;
230 if (lockf(fd, F_TLOCK, 0) == -1)
231 return -1;
233 len = snprintf(buffer, sizeof(buffer), "%ld\n", (long)getpid());
234 if (write(fd, buffer, len) != len)
235 return -1;
236 #else
237 HANDLE file;
238 DWORD flags;
239 OVERLAPPED overlap;
240 BOOL ret;
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)
247 return -1;
249 flags = LOCKFILE_EXCLUSIVE_LOCK | LOCKFILE_FAIL_IMMEDIATELY;
250 overlap.hEvent = 0;
251 /* Lock 1 byte. */
252 ret = LockFileEx(file, flags, 0, 0, 1, &overlap);
253 if (ret == 0)
254 return -1;
256 /* Write PID to file. */
257 len = snprintf(buffer, sizeof(buffer), "%ld\n", (long)getpid());
258 ret = WriteFileEx(file, (LPCVOID)buffer, (DWORD)len,
259 &overlap, NULL);
260 if (ret == 0)
261 return -1;
262 #endif
263 return 0;
266 #ifdef _WIN32
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)
273 union {
274 unsigned long long ns100; /*time since 1 Jan 1601 in 100ns units */
275 FILETIME ft;
276 } _now;
278 if(tp)
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. */
286 return 0;
288 #endif /* _WIN32 */