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ea88812f FB |
1 | /* |
2 | * QEMU low level functions | |
5fafdf24 | 3 | * |
ea88812f | 4 | * Copyright (c) 2003 Fabrice Bellard |
5fafdf24 | 5 | * |
ea88812f FB |
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> | |
ea88812f FB |
28 | #include <errno.h> |
29 | #include <unistd.h> | |
aa26bb2d | 30 | #include <fcntl.h> |
605686cd TS |
31 | #ifdef HOST_SOLARIS |
32 | #include <sys/types.h> | |
33 | #include <sys/statvfs.h> | |
34 | #endif | |
ea88812f | 35 | |
87ecb68b PB |
36 | #include "qemu-common.h" |
37 | #include "sysemu.h" | |
ea88812f | 38 | |
6e4255f6 | 39 | #ifdef _WIN32 |
4fddf62a | 40 | #define WIN32_LEAN_AND_MEAN |
6e4255f6 FB |
41 | #include <windows.h> |
42 | #elif defined(_BSD) | |
194884dd FB |
43 | #include <stdlib.h> |
44 | #else | |
49b470eb | 45 | #include <malloc.h> |
194884dd | 46 | #endif |
49b470eb | 47 | |
6e4255f6 | 48 | #if defined(_WIN32) |
33f00271 AZ |
49 | void *qemu_memalign(size_t alignment, size_t size) |
50 | { | |
51 | return VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE); | |
52 | } | |
6e4255f6 FB |
53 | |
54 | void *qemu_vmalloc(size_t size) | |
55 | { | |
56 | /* FIXME: this is not exactly optimal solution since VirtualAlloc | |
57 | has 64Kb granularity, but at least it guarantees us that the | |
58 | memory is page aligned. */ | |
59 | return VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE); | |
60 | } | |
61 | ||
62 | void qemu_vfree(void *ptr) | |
63 | { | |
64 | VirtualFree(ptr, 0, MEM_RELEASE); | |
65 | } | |
66 | ||
6cb7ee85 PB |
67 | #else |
68 | ||
69 | #if defined(USE_KQEMU) | |
49b470eb | 70 | |
6bae7ed8 | 71 | #include <sys/vfs.h> |
49b470eb FB |
72 | #include <sys/mman.h> |
73 | #include <fcntl.h> | |
74 | ||
9596ebb7 | 75 | static void *kqemu_vmalloc(size_t size) |
49b470eb FB |
76 | { |
77 | static int phys_ram_fd = -1; | |
78 | static int phys_ram_size = 0; | |
79 | const char *tmpdir; | |
80 | char phys_ram_file[1024]; | |
81 | void *ptr; | |
605686cd TS |
82 | #ifdef HOST_SOLARIS |
83 | struct statvfs stfs; | |
84 | #else | |
6bae7ed8 | 85 | struct statfs stfs; |
605686cd | 86 | #endif |
49b470eb FB |
87 | |
88 | if (phys_ram_fd < 0) { | |
89 | tmpdir = getenv("QEMU_TMPDIR"); | |
90 | if (!tmpdir) | |
605686cd TS |
91 | #ifdef HOST_SOLARIS |
92 | tmpdir = "/tmp"; | |
93 | if (statvfs(tmpdir, &stfs) == 0) { | |
94 | #else | |
49b470eb | 95 | tmpdir = "/dev/shm"; |
6bae7ed8 | 96 | if (statfs(tmpdir, &stfs) == 0) { |
605686cd | 97 | #endif |
6bae7ed8 FB |
98 | int64_t free_space; |
99 | int ram_mb; | |
100 | ||
101 | extern int ram_size; | |
102 | free_space = (int64_t)stfs.f_bavail * stfs.f_bsize; | |
103 | if ((ram_size + 8192 * 1024) >= free_space) { | |
104 | ram_mb = (ram_size / (1024 * 1024)); | |
5fafdf24 | 105 | fprintf(stderr, |
6bae7ed8 FB |
106 | "You do not have enough space in '%s' for the %d MB of QEMU virtual RAM.\n", |
107 | tmpdir, ram_mb); | |
108 | if (strcmp(tmpdir, "/dev/shm") == 0) { | |
109 | fprintf(stderr, "To have more space available provided you have enough RAM and swap, do as root:\n" | |
110 | "umount /dev/shm\n" | |
111 | "mount -t tmpfs -o size=%dm none /dev/shm\n", | |
112 | ram_mb + 16); | |
113 | } else { | |
5fafdf24 | 114 | fprintf(stderr, |
6bae7ed8 FB |
115 | "Use the '-m' option of QEMU to diminish the amount of virtual RAM or use the\n" |
116 | "QEMU_TMPDIR environment variable to set another directory where the QEMU\n" | |
117 | "temporary RAM file will be opened.\n"); | |
118 | } | |
6cb7ee85 | 119 | fprintf(stderr, "Or disable the accelerator module with -no-kqemu\n"); |
6bae7ed8 FB |
120 | exit(1); |
121 | } | |
122 | } | |
5fafdf24 | 123 | snprintf(phys_ram_file, sizeof(phys_ram_file), "%s/qemuXXXXXX", |
49b470eb | 124 | tmpdir); |
243a273e FB |
125 | phys_ram_fd = mkstemp(phys_ram_file); |
126 | if (phys_ram_fd < 0) { | |
5fafdf24 | 127 | fprintf(stderr, |
49b470eb FB |
128 | "warning: could not create temporary file in '%s'.\n" |
129 | "Use QEMU_TMPDIR to select a directory in a tmpfs filesystem.\n" | |
130 | "Using '/tmp' as fallback.\n", | |
131 | tmpdir); | |
5fafdf24 | 132 | snprintf(phys_ram_file, sizeof(phys_ram_file), "%s/qemuXXXXXX", |
49b470eb | 133 | "/tmp"); |
243a273e FB |
134 | phys_ram_fd = mkstemp(phys_ram_file); |
135 | if (phys_ram_fd < 0) { | |
5fafdf24 | 136 | fprintf(stderr, "Could not create temporary memory file '%s'\n", |
49b470eb FB |
137 | phys_ram_file); |
138 | exit(1); | |
139 | } | |
140 | } | |
49b470eb FB |
141 | unlink(phys_ram_file); |
142 | } | |
143 | size = (size + 4095) & ~4095; | |
144 | ftruncate(phys_ram_fd, phys_ram_size + size); | |
5fafdf24 TS |
145 | ptr = mmap(NULL, |
146 | size, | |
147 | PROT_WRITE | PROT_READ, MAP_SHARED, | |
49b470eb FB |
148 | phys_ram_fd, phys_ram_size); |
149 | if (ptr == MAP_FAILED) { | |
150 | fprintf(stderr, "Could not map physical memory\n"); | |
151 | exit(1); | |
152 | } | |
153 | phys_ram_size += size; | |
154 | return ptr; | |
155 | } | |
156 | ||
9596ebb7 | 157 | static void kqemu_vfree(void *ptr) |
49b470eb FB |
158 | { |
159 | /* may be useful some day, but currently we do not need to free */ | |
160 | } | |
161 | ||
6cb7ee85 | 162 | #endif |
49b470eb | 163 | |
33f00271 AZ |
164 | void *qemu_memalign(size_t alignment, size_t size) |
165 | { | |
166 | #if defined(_POSIX_C_SOURCE) | |
167 | int ret; | |
168 | void *ptr; | |
169 | ret = posix_memalign(&ptr, alignment, size); | |
170 | if (ret != 0) | |
171 | return NULL; | |
172 | return ptr; | |
173 | #elif defined(_BSD) | |
174 | return valloc(size); | |
175 | #else | |
176 | return memalign(alignment, size); | |
177 | #endif | |
178 | } | |
179 | ||
49b470eb FB |
180 | /* alloc shared memory pages */ |
181 | void *qemu_vmalloc(size_t size) | |
182 | { | |
6cb7ee85 PB |
183 | #if defined(USE_KQEMU) |
184 | if (kqemu_allowed) | |
185 | return kqemu_vmalloc(size); | |
186 | #endif | |
49b470eb FB |
187 | #ifdef _BSD |
188 | return valloc(size); | |
189 | #else | |
190 | return memalign(4096, size); | |
191 | #endif | |
192 | } | |
193 | ||
194 | void qemu_vfree(void *ptr) | |
195 | { | |
6cb7ee85 PB |
196 | #if defined(USE_KQEMU) |
197 | if (kqemu_allowed) | |
198 | kqemu_vfree(ptr); | |
199 | #endif | |
49b470eb FB |
200 | free(ptr); |
201 | } | |
202 | ||
203 | #endif | |
204 | ||
aa26bb2d TS |
205 | int qemu_create_pidfile(const char *filename) |
206 | { | |
207 | char buffer[128]; | |
208 | int len; | |
209 | #ifndef _WIN32 | |
210 | int fd; | |
211 | ||
212 | fd = open(filename, O_RDWR | O_CREAT, 0600); | |
213 | if (fd == -1) | |
214 | return -1; | |
215 | ||
216 | if (lockf(fd, F_TLOCK, 0) == -1) | |
217 | return -1; | |
218 | ||
219 | len = snprintf(buffer, sizeof(buffer), "%ld\n", (long)getpid()); | |
220 | if (write(fd, buffer, len) != len) | |
221 | return -1; | |
222 | #else | |
223 | HANDLE file; | |
224 | DWORD flags; | |
225 | OVERLAPPED overlap; | |
226 | BOOL ret; | |
227 | ||
228 | /* Open for writing with no sharing. */ | |
5fafdf24 | 229 | file = CreateFile(filename, GENERIC_WRITE, 0, NULL, |
aa26bb2d TS |
230 | OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL); |
231 | ||
232 | if (file == INVALID_HANDLE_VALUE) | |
233 | return -1; | |
234 | ||
235 | flags = LOCKFILE_EXCLUSIVE_LOCK | LOCKFILE_FAIL_IMMEDIATELY; | |
236 | overlap.hEvent = 0; | |
237 | /* Lock 1 byte. */ | |
238 | ret = LockFileEx(file, flags, 0, 0, 1, &overlap); | |
239 | if (ret == 0) | |
240 | return -1; | |
241 | ||
242 | /* Write PID to file. */ | |
243 | len = snprintf(buffer, sizeof(buffer), "%ld\n", (long)getpid()); | |
5fafdf24 | 244 | ret = WriteFileEx(file, (LPCVOID)buffer, (DWORD)len, |
aa26bb2d TS |
245 | &overlap, NULL); |
246 | if (ret == 0) | |
247 | return -1; | |
248 | #endif | |
249 | return 0; | |
250 | } | |
29b3a662 PB |
251 | |
252 | #ifdef _WIN32 | |
253 | ||
254 | /* Offset between 1/1/1601 and 1/1/1970 in 100 nanosec units */ | |
255 | #define _W32_FT_OFFSET (116444736000000000ULL) | |
256 | ||
257 | int qemu_gettimeofday(qemu_timeval *tp) | |
258 | { | |
259 | union { | |
260 | unsigned long long ns100; /*time since 1 Jan 1601 in 100ns units */ | |
261 | FILETIME ft; | |
262 | } _now; | |
263 | ||
264 | if(tp) | |
265 | { | |
266 | GetSystemTimeAsFileTime (&_now.ft); | |
267 | tp->tv_usec=(long)((_now.ns100 / 10ULL) % 1000000ULL ); | |
268 | tp->tv_sec= (long)((_now.ns100 - _W32_FT_OFFSET) / 10000000ULL); | |
269 | } | |
270 | /* Always return 0 as per Open Group Base Specifications Issue 6. | |
271 | Do not set errno on error. */ | |
272 | return 0; | |
273 | } | |
274 | #endif /* _WIN32 */ |