root / osdep.c @ 07bf2857
History | View | Annotate | Download (7.4 kB)
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 HOST_SOLARIS
|
32 |
#include <sys/types.h> |
33 |
#include <sys/statvfs.h> |
34 |
#endif
|
35 |
|
36 |
#include "qemu-common.h" |
37 |
#include "sysemu.h" |
38 |
|
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
|
47 |
|
48 |
#if defined(_WIN32)
|
49 |
void *qemu_memalign(size_t alignment, size_t size)
|
50 |
{ |
51 |
return VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE); |
52 |
} |
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 |
|
67 |
#else
|
68 |
|
69 |
#if defined(USE_KQEMU)
|
70 |
|
71 |
#include <sys/vfs.h> |
72 |
#include <sys/mman.h> |
73 |
#include <fcntl.h> |
74 |
|
75 |
static void *kqemu_vmalloc(size_t size) |
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;
|
82 |
#ifdef HOST_SOLARIS
|
83 |
struct statvfs stfs;
|
84 |
#else
|
85 |
struct statfs stfs;
|
86 |
#endif
|
87 |
|
88 |
if (phys_ram_fd < 0) { |
89 |
tmpdir = getenv("QEMU_TMPDIR");
|
90 |
if (!tmpdir)
|
91 |
#ifdef HOST_SOLARIS
|
92 |
tmpdir = "/tmp";
|
93 |
if (statvfs(tmpdir, &stfs) == 0) { |
94 |
#else
|
95 |
tmpdir = "/dev/shm";
|
96 |
if (statfs(tmpdir, &stfs) == 0) { |
97 |
#endif
|
98 |
int64_t free_space; |
99 |
int ram_mb;
|
100 |
|
101 |
free_space = (int64_t)stfs.f_bavail * stfs.f_bsize; |
102 |
if ((ram_size + 8192 * 1024) >= free_space) { |
103 |
ram_mb = (ram_size / (1024 * 1024)); |
104 |
fprintf(stderr, |
105 |
"You do not have enough space in '%s' for the %d MB of QEMU virtual RAM.\n",
|
106 |
tmpdir, ram_mb); |
107 |
if (strcmp(tmpdir, "/dev/shm") == 0) { |
108 |
fprintf(stderr, "To have more space available provided you have enough RAM and swap, do as root:\n"
|
109 |
"mount -o remount,size=%dm /dev/shm\n",
|
110 |
ram_mb + 16);
|
111 |
} else {
|
112 |
fprintf(stderr, |
113 |
"Use the '-m' option of QEMU to diminish the amount of virtual RAM or use the\n"
|
114 |
"QEMU_TMPDIR environment variable to set another directory where the QEMU\n"
|
115 |
"temporary RAM file will be opened.\n");
|
116 |
} |
117 |
fprintf(stderr, "Or disable the accelerator module with -no-kqemu\n");
|
118 |
exit(1);
|
119 |
} |
120 |
} |
121 |
snprintf(phys_ram_file, sizeof(phys_ram_file), "%s/qemuXXXXXX", |
122 |
tmpdir); |
123 |
phys_ram_fd = mkstemp(phys_ram_file); |
124 |
if (phys_ram_fd < 0) { |
125 |
fprintf(stderr, |
126 |
"warning: could not create temporary file in '%s'.\n"
|
127 |
"Use QEMU_TMPDIR to select a directory in a tmpfs filesystem.\n"
|
128 |
"Using '/tmp' as fallback.\n",
|
129 |
tmpdir); |
130 |
snprintf(phys_ram_file, sizeof(phys_ram_file), "%s/qemuXXXXXX", |
131 |
"/tmp");
|
132 |
phys_ram_fd = mkstemp(phys_ram_file); |
133 |
if (phys_ram_fd < 0) { |
134 |
fprintf(stderr, "Could not create temporary memory file '%s'\n",
|
135 |
phys_ram_file); |
136 |
exit(1);
|
137 |
} |
138 |
} |
139 |
unlink(phys_ram_file); |
140 |
} |
141 |
size = (size + 4095) & ~4095; |
142 |
ftruncate(phys_ram_fd, phys_ram_size + size); |
143 |
ptr = mmap(NULL,
|
144 |
size, |
145 |
PROT_WRITE | PROT_READ, MAP_SHARED, |
146 |
phys_ram_fd, phys_ram_size); |
147 |
if (ptr == MAP_FAILED) {
|
148 |
fprintf(stderr, "Could not map physical memory\n");
|
149 |
exit(1);
|
150 |
} |
151 |
phys_ram_size += size; |
152 |
return ptr;
|
153 |
} |
154 |
|
155 |
static void kqemu_vfree(void *ptr) |
156 |
{ |
157 |
/* may be useful some day, but currently we do not need to free */
|
158 |
} |
159 |
|
160 |
#endif
|
161 |
|
162 |
void *qemu_memalign(size_t alignment, size_t size)
|
163 |
{ |
164 |
#if defined(_POSIX_C_SOURCE)
|
165 |
int ret;
|
166 |
void *ptr;
|
167 |
ret = posix_memalign(&ptr, alignment, size); |
168 |
if (ret != 0) |
169 |
return NULL; |
170 |
return ptr;
|
171 |
#elif defined(_BSD)
|
172 |
return valloc(size);
|
173 |
#else
|
174 |
return memalign(alignment, size);
|
175 |
#endif
|
176 |
} |
177 |
|
178 |
/* alloc shared memory pages */
|
179 |
void *qemu_vmalloc(size_t size)
|
180 |
{ |
181 |
#if defined(USE_KQEMU)
|
182 |
if (kqemu_allowed)
|
183 |
return kqemu_vmalloc(size);
|
184 |
#endif
|
185 |
#ifdef _BSD
|
186 |
return valloc(size);
|
187 |
#else
|
188 |
return memalign(4096, size); |
189 |
#endif
|
190 |
} |
191 |
|
192 |
void qemu_vfree(void *ptr) |
193 |
{ |
194 |
#if defined(USE_KQEMU)
|
195 |
if (kqemu_allowed)
|
196 |
kqemu_vfree(ptr); |
197 |
#endif
|
198 |
free(ptr); |
199 |
} |
200 |
|
201 |
#endif
|
202 |
|
203 |
int qemu_create_pidfile(const char *filename) |
204 |
{ |
205 |
char buffer[128]; |
206 |
int len;
|
207 |
#ifndef _WIN32
|
208 |
int fd;
|
209 |
|
210 |
fd = open(filename, O_RDWR | O_CREAT, 0600);
|
211 |
if (fd == -1) |
212 |
return -1; |
213 |
|
214 |
if (lockf(fd, F_TLOCK, 0) == -1) |
215 |
return -1; |
216 |
|
217 |
len = snprintf(buffer, sizeof(buffer), "%ld\n", (long)getpid()); |
218 |
if (write(fd, buffer, len) != len)
|
219 |
return -1; |
220 |
#else
|
221 |
HANDLE file; |
222 |
DWORD flags; |
223 |
OVERLAPPED overlap; |
224 |
BOOL ret; |
225 |
|
226 |
/* Open for writing with no sharing. */
|
227 |
file = CreateFile(filename, GENERIC_WRITE, 0, NULL, |
228 |
OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
|
229 |
|
230 |
if (file == INVALID_HANDLE_VALUE)
|
231 |
return -1; |
232 |
|
233 |
flags = LOCKFILE_EXCLUSIVE_LOCK | LOCKFILE_FAIL_IMMEDIATELY; |
234 |
overlap.hEvent = 0;
|
235 |
/* Lock 1 byte. */
|
236 |
ret = LockFileEx(file, flags, 0, 0, 1, &overlap); |
237 |
if (ret == 0) |
238 |
return -1; |
239 |
|
240 |
/* Write PID to file. */
|
241 |
len = snprintf(buffer, sizeof(buffer), "%ld\n", (long)getpid()); |
242 |
ret = WriteFileEx(file, (LPCVOID)buffer, (DWORD)len, |
243 |
&overlap, NULL);
|
244 |
if (ret == 0) |
245 |
return -1; |
246 |
#endif
|
247 |
return 0; |
248 |
} |
249 |
|
250 |
#ifdef _WIN32
|
251 |
|
252 |
/* Offset between 1/1/1601 and 1/1/1970 in 100 nanosec units */
|
253 |
#define _W32_FT_OFFSET (116444736000000000ULL) |
254 |
|
255 |
int qemu_gettimeofday(qemu_timeval *tp)
|
256 |
{ |
257 |
union {
|
258 |
unsigned long long ns100; /*time since 1 Jan 1601 in 100ns units */ |
259 |
FILETIME ft; |
260 |
} _now; |
261 |
|
262 |
if(tp)
|
263 |
{ |
264 |
GetSystemTimeAsFileTime (&_now.ft); |
265 |
tp->tv_usec=(long)((_now.ns100 / 10ULL) % 1000000ULL ); |
266 |
tp->tv_sec= (long)((_now.ns100 - _W32_FT_OFFSET) / 10000000ULL); |
267 |
} |
268 |
/* Always return 0 as per Open Group Base Specifications Issue 6.
|
269 |
Do not set errno on error. */
|
270 |
return 0; |
271 |
} |
272 |
#endif /* _WIN32 */ |