1 /*
2 * QEMU low level functions
3 *
4 * Copyright (c) 2003 Fabrice Bellard
5 *
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:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
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.
23 */
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 CONFIG_SOLARIS
32 #include <sys/types.h>
33 #include <sys/statvfs.h>
34 #endif
35
36 /* Needed early for CONFIG_BSD etc. */
37 #include "config-host.h"
38
39 #ifdef _WIN32
40 #include <windows.h>
41 #elif defined(CONFIG_BSD)
42 #include <stdlib.h>
43 #else
44 #include <malloc.h>
45 #endif
46
47 #include "qemu-common.h"
48 #include "sysemu.h"
49
50 #ifdef _WIN32
51 #define WIN32_LEAN_AND_MEAN
52 #include <windows.h>
53 #elif defined(CONFIG_BSD)
54 #include <stdlib.h>
55 #else
56 #include <malloc.h>
57 #endif
58
59
60 #if defined(_WIN32)
qemu_memalign(size_t alignment,size_t size)61 void *qemu_memalign(size_t alignment, size_t size)
62 {
63 return VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE);
64 }
65
qemu_vmalloc(size_t size)66 void *qemu_vmalloc(size_t size)
67 {
68 /* FIXME: this is not exactly optimal solution since VirtualAlloc
69 has 64Kb granularity, but at least it guarantees us that the
70 memory is page aligned. */
71 return VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE);
72 }
73
qemu_vfree(void * ptr)74 void qemu_vfree(void *ptr)
75 {
76 VirtualFree(ptr, 0, MEM_RELEASE);
77 }
78
79 #else
80
81 #if defined(CONFIG_KQEMU)
82
83 #ifdef __OpenBSD__
84 #include <sys/param.h>
85 #include <sys/types.h>
86 #include <sys/mount.h>
87 #else
88 #ifndef __FreeBSD__
89 #include <sys/vfs.h>
90 #endif
91 #endif
92
93 #include <sys/mman.h>
94 #include <fcntl.h>
95
kqemu_vmalloc(size_t size)96 static void *kqemu_vmalloc(size_t size)
97 {
98 static int phys_ram_fd = -1;
99 static int phys_ram_size = 0;
100 void *ptr;
101
102 /* no need (?) for a dummy file on OpenBSD/FreeBSD */
103 #if defined(__OpenBSD__) || defined(__FreeBSD__) || defined(__DragonFly__)
104 int map_anon = MAP_ANON;
105 #else
106 int map_anon = 0;
107 const char *tmpdir;
108 char phys_ram_file[1024];
109 #ifdef CONFIG_SOLARIS
110 struct statvfs stfs;
111 #else
112 struct statfs stfs;
113 #endif
114
115 if (phys_ram_fd < 0) {
116 tmpdir = getenv("QEMU_TMPDIR");
117 if (!tmpdir)
118 #ifdef CONFIG_SOLARIS
119 tmpdir = "/tmp";
120 if (statvfs(tmpdir, &stfs) == 0) {
121 #else
122 tmpdir = "/dev/shm";
123 if (statfs(tmpdir, &stfs) == 0) {
124 #endif
125 int64_t free_space;
126 int ram_mb;
127
128 free_space = (int64_t)stfs.f_bavail * stfs.f_bsize;
129 if ((ram_size + 8192 * 1024) >= free_space) {
130 ram_mb = (ram_size / (1024 * 1024));
131 fprintf(stderr,
132 "You do not have enough space in '%s' for the %d MB of QEMU virtual RAM.\n",
133 tmpdir, ram_mb);
134 if (strcmp(tmpdir, "/dev/shm") == 0) {
135 fprintf(stderr, "To have more space available provided you have enough RAM and swap, do as root:\n"
136 "mount -o remount,size=%dm /dev/shm\n",
137 ram_mb + 16);
138 } else {
139 fprintf(stderr,
140 "Use the '-m' option of QEMU to diminish the amount of virtual RAM or use the\n"
141 "QEMU_TMPDIR environment variable to set another directory where the QEMU\n"
142 "temporary RAM file will be opened.\n");
143 }
144 fprintf(stderr, "Or disable the accelerator module with -no-kqemu\n");
145 exit(1);
146 }
147 }
148 snprintf(phys_ram_file, sizeof(phys_ram_file), "%s/qemuXXXXXX",
149 tmpdir);
150 phys_ram_fd = mkstemp(phys_ram_file);
151 if (phys_ram_fd < 0) {
152 fprintf(stderr,
153 "warning: could not create temporary file in '%s'.\n"
154 "Use QEMU_TMPDIR to select a directory in a tmpfs filesystem.\n"
155 "Using '/tmp' as fallback.\n",
156 tmpdir);
157 snprintf(phys_ram_file, sizeof(phys_ram_file), "%s/qemuXXXXXX",
158 "/tmp");
159 phys_ram_fd = mkstemp(phys_ram_file);
160 if (phys_ram_fd < 0) {
161 fprintf(stderr, "Could not create temporary memory file '%s'\n",
162 phys_ram_file);
163 exit(1);
164 }
165 }
166 unlink(phys_ram_file);
167 }
168 size = (size + 4095) & ~4095;
169 ftruncate(phys_ram_fd, phys_ram_size + size);
170 #endif /* !(__OpenBSD__ || __FreeBSD__ || __DragonFly__) */
171 ptr = mmap(NULL,
172 size,
173 PROT_WRITE | PROT_READ, map_anon | MAP_SHARED,
174 phys_ram_fd, phys_ram_size);
175 if (ptr == MAP_FAILED) {
176 fprintf(stderr, "Could not map physical memory\n");
177 exit(1);
178 }
179 phys_ram_size += size;
180 return ptr;
181 }
182
183 static void kqemu_vfree(void *ptr)
184 {
185 /* may be useful some day, but currently we do not need to free */
186 }
187
188 #endif
189
190 void *qemu_memalign(size_t alignment, size_t size)
191 {
192 #if defined(_POSIX_C_SOURCE)
193 int ret;
194 void *ptr;
195 ret = posix_memalign(&ptr, alignment, size);
196 if (ret != 0)
197 return NULL;
198 return ptr;
199 #elif defined(CONFIG_BSD)
200 return valloc(size);
201 #else
202 return memalign(alignment, size);
203 #endif
204 }
205
206 /* alloc shared memory pages */
207 void *qemu_vmalloc(size_t size)
208 {
209 #if defined(CONFIG_KQEMU)
210 if (kqemu_allowed)
211 return kqemu_vmalloc(size);
212 #endif
213 return qemu_memalign(getpagesize(), size);
214 }
215
216 void qemu_vfree(void *ptr)
217 {
218 #if defined(CONFIG_KQEMU)
219 if (kqemu_allowed)
220 kqemu_vfree(ptr);
221 #endif
222 free(ptr);
223 }
224
225 #endif
226
227 int qemu_create_pidfile(const char *filename)
228 {
229 char buffer[128];
230 int len;
231 #ifndef _WIN32
232 int fd;
233
234 fd = open(filename, O_RDWR | O_CREAT, 0600);
235 if (fd == -1)
236 return -1;
237
238 if (lockf(fd, F_TLOCK, 0) == -1)
239 return -1;
240
241 len = snprintf(buffer, sizeof(buffer), "%ld\n", (long)getpid());
242 if (write(fd, buffer, len) != len)
243 return -1;
244 #else
245 HANDLE file;
246 DWORD flags;
247 OVERLAPPED overlap;
248 BOOL ret;
249
250 /* Open for writing with no sharing. */
251 file = CreateFile(filename, GENERIC_WRITE, 0, NULL,
252 OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
253
254 if (file == INVALID_HANDLE_VALUE)
255 return -1;
256
257 flags = LOCKFILE_EXCLUSIVE_LOCK | LOCKFILE_FAIL_IMMEDIATELY;
258 overlap.hEvent = 0;
259 /* Lock 1 byte. */
260 ret = LockFileEx(file, flags, 0, 0, 1, &overlap);
261 if (ret == 0)
262 return -1;
263
264 /* Write PID to file. */
265 len = snprintf(buffer, sizeof(buffer), "%ld\n", (long)getpid());
266 ret = WriteFileEx(file, (LPCVOID)buffer, (DWORD)len,
267 &overlap, NULL);
268 if (ret == 0)
269 return -1;
270 #endif
271 return 0;
272 }
273
274 #ifdef _WIN32
275
276 /* Offset between 1/1/1601 and 1/1/1970 in 100 nanosec units */
277 #define _W32_FT_OFFSET (116444736000000000ULL)
278
279 int qemu_gettimeofday(qemu_timeval *tp)
280 {
281 union {
282 unsigned long long ns100; /*time since 1 Jan 1601 in 100ns units */
283 FILETIME ft;
284 } _now;
285
286 if(tp)
287 {
288 GetSystemTimeAsFileTime (&_now.ft);
289 tp->tv_usec=(long)((_now.ns100 / 10ULL) % 1000000ULL );
290 tp->tv_sec= (long)((_now.ns100 - _W32_FT_OFFSET) / 10000000ULL);
291 }
292 /* Always return 0 as per Open Group Base Specifications Issue 6.
293 Do not set errno on error. */
294 return 0;
295 }
296
297 int ffs(int val)
298 {
299 int nn;
300
301 for (nn = 0; nn < sizeof(int)*8; nn++)
302 if (val & (1 << nn))
303 return nn+1;
304
305 return 0;
306 }
307
308 #endif /* _WIN32 */
309
310
311