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
32 #include <sys/types.h>
33 #include <sys/statvfs.h>
36 #include "qemu-common.h"
40 #define WIN32_LEAN_AND_MEAN
49 void *qemu_memalign(size_t alignment
, size_t size
)
51 return VirtualAlloc(NULL
, size
, MEM_COMMIT
, PAGE_READWRITE
);
54 void *qemu_vmalloc(size_t size
)
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
);
62 void qemu_vfree(void *ptr
)
64 VirtualFree(ptr
, 0, MEM_RELEASE
);
69 #if defined(USE_KQEMU)
75 static void *kqemu_vmalloc(size_t size
)
77 static int phys_ram_fd
= -1;
78 static int phys_ram_size
= 0;
80 char phys_ram_file
[1024];
88 if (phys_ram_fd
< 0) {
89 tmpdir
= getenv("QEMU_TMPDIR");
93 if (statvfs(tmpdir
, &stfs
) == 0) {
96 if (statfs(tmpdir
, &stfs
) == 0) {
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));
106 "You do not have enough space in '%s' for the %d MB of QEMU virtual RAM.\n",
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 "mount -o remount,size=%dm /dev/shm\n",
114 "Use the '-m' option of QEMU to diminish the amount of virtual RAM or use the\n"
115 "QEMU_TMPDIR environment variable to set another directory where the QEMU\n"
116 "temporary RAM file will be opened.\n");
118 fprintf(stderr
, "Or disable the accelerator module with -no-kqemu\n");
122 snprintf(phys_ram_file
, sizeof(phys_ram_file
), "%s/qemuXXXXXX",
124 phys_ram_fd
= mkstemp(phys_ram_file
);
125 if (phys_ram_fd
< 0) {
127 "warning: could not create temporary file in '%s'.\n"
128 "Use QEMU_TMPDIR to select a directory in a tmpfs filesystem.\n"
129 "Using '/tmp' as fallback.\n",
131 snprintf(phys_ram_file
, sizeof(phys_ram_file
), "%s/qemuXXXXXX",
133 phys_ram_fd
= mkstemp(phys_ram_file
);
134 if (phys_ram_fd
< 0) {
135 fprintf(stderr
, "Could not create temporary memory file '%s'\n",
140 unlink(phys_ram_file
);
142 size
= (size
+ 4095) & ~4095;
143 ftruncate(phys_ram_fd
, phys_ram_size
+ size
);
146 PROT_WRITE
| PROT_READ
, MAP_SHARED
,
147 phys_ram_fd
, phys_ram_size
);
148 if (ptr
== MAP_FAILED
) {
149 fprintf(stderr
, "Could not map physical memory\n");
152 phys_ram_size
+= size
;
156 static void kqemu_vfree(void *ptr
)
158 /* may be useful some day, but currently we do not need to free */
163 void *qemu_memalign(size_t alignment
, size_t size
)
165 #if defined(_POSIX_C_SOURCE)
168 ret
= posix_memalign(&ptr
, alignment
, size
);
175 return memalign(alignment
, size
);
179 /* alloc shared memory pages */
180 void *qemu_vmalloc(size_t size
)
182 #if defined(USE_KQEMU)
184 return kqemu_vmalloc(size
);
189 return memalign(4096, size
);
193 void qemu_vfree(void *ptr
)
195 #if defined(USE_KQEMU)
204 int qemu_create_pidfile(const char *filename
)
211 fd
= open(filename
, O_RDWR
| O_CREAT
, 0600);
215 if (lockf(fd
, F_TLOCK
, 0) == -1)
218 len
= snprintf(buffer
, sizeof(buffer
), "%ld\n", (long)getpid());
219 if (write(fd
, buffer
, len
) != len
)
227 /* Open for writing with no sharing. */
228 file
= CreateFile(filename
, GENERIC_WRITE
, 0, NULL
,
229 OPEN_ALWAYS
, FILE_ATTRIBUTE_NORMAL
, NULL
);
231 if (file
== INVALID_HANDLE_VALUE
)
234 flags
= LOCKFILE_EXCLUSIVE_LOCK
| LOCKFILE_FAIL_IMMEDIATELY
;
237 ret
= LockFileEx(file
, flags
, 0, 0, 1, &overlap
);
241 /* Write PID to file. */
242 len
= snprintf(buffer
, sizeof(buffer
), "%ld\n", (long)getpid());
243 ret
= WriteFileEx(file
, (LPCVOID
)buffer
, (DWORD
)len
,
253 /* Offset between 1/1/1601 and 1/1/1970 in 100 nanosec units */
254 #define _W32_FT_OFFSET (116444736000000000ULL)
256 int qemu_gettimeofday(qemu_timeval
*tp
)
259 unsigned long long ns100
; /*time since 1 Jan 1601 in 100ns units */
265 GetSystemTimeAsFileTime (&_now
.ft
);
266 tp
->tv_usec
=(long)((_now
.ns100
/ 10ULL) % 1000000ULL );
267 tp
->tv_sec
= (long)((_now
.ns100
- _W32_FT_OFFSET
) / 10000000ULL);
269 /* Always return 0 as per Open Group Base Specifications Issue 6.
270 Do not set errno on error. */