Key/value based qemu<->guest firmware communication mechanism (Gleb Natapov)
[qemu/mini2440.git] / osdep.c
blob683aad0f0cce168368bda866a6490e073788020b
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 #define WIN32_LEAN_AND_MEAN
41 #include <windows.h>
42 #elif defined(_BSD)
43 #include <stdlib.h>
44 #else
45 #include <malloc.h>
46 #endif
48 #include "qemu_socket.h"
50 #if defined(_WIN32)
51 void *qemu_memalign(size_t alignment, size_t size)
53 return VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE);
56 void *qemu_vmalloc(size_t size)
58 /* FIXME: this is not exactly optimal solution since VirtualAlloc
59 has 64Kb granularity, but at least it guarantees us that the
60 memory is page aligned. */
61 return VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE);
64 void qemu_vfree(void *ptr)
66 VirtualFree(ptr, 0, MEM_RELEASE);
69 #else
71 #if defined(USE_KQEMU)
73 #ifdef __OpenBSD__
74 #include <sys/param.h>
75 #include <sys/types.h>
76 #include <sys/mount.h>
77 #else
78 #include <sys/vfs.h>
79 #endif
81 #include <sys/mman.h>
82 #include <fcntl.h>
84 static void *kqemu_vmalloc(size_t size)
86 static int phys_ram_fd = -1;
87 static int phys_ram_size = 0;
88 void *ptr;
90 #ifdef __OpenBSD__ /* no need (?) for a dummy file on OpenBSD */
91 int map_anon = MAP_ANON;
92 #else
93 int map_anon = 0;
94 const char *tmpdir;
95 char phys_ram_file[1024];
96 #ifdef HOST_SOLARIS
97 struct statvfs stfs;
98 #else
99 struct statfs stfs;
100 #endif
102 if (phys_ram_fd < 0) {
103 tmpdir = getenv("QEMU_TMPDIR");
104 if (!tmpdir)
105 #ifdef HOST_SOLARIS
106 tmpdir = "/tmp";
107 if (statvfs(tmpdir, &stfs) == 0) {
108 #else
109 tmpdir = "/dev/shm";
110 if (statfs(tmpdir, &stfs) == 0) {
111 #endif
112 int64_t free_space;
113 int ram_mb;
115 free_space = (int64_t)stfs.f_bavail * stfs.f_bsize;
116 if ((ram_size + 8192 * 1024) >= free_space) {
117 ram_mb = (ram_size / (1024 * 1024));
118 fprintf(stderr,
119 "You do not have enough space in '%s' for the %d MB of QEMU virtual RAM.\n",
120 tmpdir, ram_mb);
121 if (strcmp(tmpdir, "/dev/shm") == 0) {
122 fprintf(stderr, "To have more space available provided you have enough RAM and swap, do as root:\n"
123 "mount -o remount,size=%dm /dev/shm\n",
124 ram_mb + 16);
125 } else {
126 fprintf(stderr,
127 "Use the '-m' option of QEMU to diminish the amount of virtual RAM or use the\n"
128 "QEMU_TMPDIR environment variable to set another directory where the QEMU\n"
129 "temporary RAM file will be opened.\n");
131 fprintf(stderr, "Or disable the accelerator module with -no-kqemu\n");
132 exit(1);
135 snprintf(phys_ram_file, sizeof(phys_ram_file), "%s/qemuXXXXXX",
136 tmpdir);
137 phys_ram_fd = mkstemp(phys_ram_file);
138 if (phys_ram_fd < 0) {
139 fprintf(stderr,
140 "warning: could not create temporary file in '%s'.\n"
141 "Use QEMU_TMPDIR to select a directory in a tmpfs filesystem.\n"
142 "Using '/tmp' as fallback.\n",
143 tmpdir);
144 snprintf(phys_ram_file, sizeof(phys_ram_file), "%s/qemuXXXXXX",
145 "/tmp");
146 phys_ram_fd = mkstemp(phys_ram_file);
147 if (phys_ram_fd < 0) {
148 fprintf(stderr, "Could not create temporary memory file '%s'\n",
149 phys_ram_file);
150 exit(1);
153 unlink(phys_ram_file);
155 size = (size + 4095) & ~4095;
156 ftruncate(phys_ram_fd, phys_ram_size + size);
157 #endif /* !__OpenBSD__ */
158 ptr = mmap(NULL,
159 size,
160 PROT_WRITE | PROT_READ, map_anon | MAP_SHARED,
161 phys_ram_fd, phys_ram_size);
162 if (ptr == MAP_FAILED) {
163 fprintf(stderr, "Could not map physical memory\n");
164 exit(1);
166 phys_ram_size += size;
167 return ptr;
170 static void kqemu_vfree(void *ptr)
172 /* may be useful some day, but currently we do not need to free */
175 #endif
177 void *qemu_memalign(size_t alignment, size_t size)
179 #if defined(_POSIX_C_SOURCE)
180 int ret;
181 void *ptr;
182 ret = posix_memalign(&ptr, alignment, size);
183 if (ret != 0)
184 return NULL;
185 return ptr;
186 #elif defined(_BSD)
187 return valloc(size);
188 #else
189 return memalign(alignment, size);
190 #endif
193 /* alloc shared memory pages */
194 void *qemu_vmalloc(size_t size)
196 #if defined(USE_KQEMU)
197 if (kqemu_allowed)
198 return kqemu_vmalloc(size);
199 #endif
200 #ifdef _BSD
201 return valloc(size);
202 #else
203 return memalign(4096, size);
204 #endif
207 void qemu_vfree(void *ptr)
209 #if defined(USE_KQEMU)
210 if (kqemu_allowed)
211 kqemu_vfree(ptr);
212 #endif
213 free(ptr);
216 #endif
218 int qemu_create_pidfile(const char *filename)
220 char buffer[128];
221 int len;
222 #ifndef _WIN32
223 int fd;
225 fd = open(filename, O_RDWR | O_CREAT, 0600);
226 if (fd == -1)
227 return -1;
229 if (lockf(fd, F_TLOCK, 0) == -1)
230 return -1;
232 len = snprintf(buffer, sizeof(buffer), "%ld\n", (long)getpid());
233 if (write(fd, buffer, len) != len)
234 return -1;
235 #else
236 HANDLE file;
237 DWORD flags;
238 OVERLAPPED overlap;
239 BOOL ret;
241 /* Open for writing with no sharing. */
242 file = CreateFile(filename, GENERIC_WRITE, 0, NULL,
243 OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
245 if (file == INVALID_HANDLE_VALUE)
246 return -1;
248 flags = LOCKFILE_EXCLUSIVE_LOCK | LOCKFILE_FAIL_IMMEDIATELY;
249 overlap.hEvent = 0;
250 /* Lock 1 byte. */
251 ret = LockFileEx(file, flags, 0, 0, 1, &overlap);
252 if (ret == 0)
253 return -1;
255 /* Write PID to file. */
256 len = snprintf(buffer, sizeof(buffer), "%ld\n", (long)getpid());
257 ret = WriteFileEx(file, (LPCVOID)buffer, (DWORD)len,
258 &overlap, NULL);
259 if (ret == 0)
260 return -1;
261 #endif
262 return 0;
265 #ifdef _WIN32
267 /* Offset between 1/1/1601 and 1/1/1970 in 100 nanosec units */
268 #define _W32_FT_OFFSET (116444736000000000ULL)
270 int qemu_gettimeofday(qemu_timeval *tp)
272 union {
273 unsigned long long ns100; /*time since 1 Jan 1601 in 100ns units */
274 FILETIME ft;
275 } _now;
277 if(tp)
279 GetSystemTimeAsFileTime (&_now.ft);
280 tp->tv_usec=(long)((_now.ns100 / 10ULL) % 1000000ULL );
281 tp->tv_sec= (long)((_now.ns100 - _W32_FT_OFFSET) / 10000000ULL);
283 /* Always return 0 as per Open Group Base Specifications Issue 6.
284 Do not set errno on error. */
285 return 0;
287 #endif /* _WIN32 */
290 #ifdef _WIN32
291 void socket_set_nonblock(int fd)
293 unsigned long opt = 1;
294 ioctlsocket(fd, FIONBIO, &opt);
297 int inet_aton(const char *cp, struct in_addr *ia)
299 uint32_t addr = inet_addr(cp);
300 if (addr == 0xffffffff)
301 return 0;
302 ia->s_addr = addr;
303 return 1;
305 #else
306 void socket_set_nonblock(int fd)
308 int f;
309 f = fcntl(fd, F_GETFL);
310 fcntl(fd, F_SETFL, f | O_NONBLOCK);
312 #endif