qemu/osdep.c

   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 void *get_mmap_addr(unsigned long size)
  49 {
  50     return NULL;
  51 }
  52
  53 void qemu_free(void *ptr)
  54 {
  55     free(ptr);
  56 }
  57
  58 void *qemu_malloc(size_t size)
  59 {
  60     return malloc(size);
  61 }
  62
  63 #if defined(_WIN32)
  64 void *qemu_memalign(size_t alignment, size_t size)
  65 {
  66     return VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE);
  67 }
  68
  69 void *qemu_vmalloc(size_t size)
  70 {
  71     /* FIXME: this is not exactly optimal solution since VirtualAlloc
  72        has 64Kb granularity, but at least it guarantees us that the
  73        memory is page aligned. */
  74     return VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE);
  75 }
  76
  77 void qemu_vfree(void *ptr)
  78 {
  79     VirtualFree(ptr, 0, MEM_RELEASE);
  80 }
  81
  82 #else
  83
  84 #if defined(USE_KQEMU)
  85
  86 #include <sys/vfs.h>
  87 #include <sys/mman.h>
  88 #include <fcntl.h>
  89
  90 static void *kqemu_vmalloc(size_t size)
  91 {
  92     static int phys_ram_fd = -1;
  93     static int phys_ram_size = 0;
  94     const char *tmpdir;
  95     char phys_ram_file[1024];
  96     void *ptr;
  97 #ifdef HOST_SOLARIS
  98     struct statvfs stfs;
  99 #else
 100     struct statfs stfs;
 101 #endif
 102
 103     if (phys_ram_fd < 0) {
 104         tmpdir = getenv("QEMU_TMPDIR");
 105         if (!tmpdir)
 106 #ifdef HOST_SOLARIS
 107             tmpdir = "/tmp";
 108         if (statvfs(tmpdir, &stfs) == 0) {
 109 #else
 110             tmpdir = "/dev/shm";
 111         if (statfs(tmpdir, &stfs) == 0) {
 112 #endif
 113             int64_t free_space;
 114             int ram_mb;
 115
 116             extern int64_t ram_size;
 117             free_space = (int64_t)stfs.f_bavail * stfs.f_bsize;
 118             if ((ram_size + 8192 * 1024) >= free_space) {
 119                 ram_mb = (ram_size / (1024 * 1024));
 120                 fprintf(stderr,
 121                         "You do not have enough space in '%s' for the %d MB of QEMU virtual RAM.\n",
 122                         tmpdir, ram_mb);
 123                 if (strcmp(tmpdir, "/dev/shm") == 0) {
 124                     fprintf(stderr, "To have more space available provided you have enough RAM and swap, do as root:\n"
 125                             "umount /dev/shm\n"
 126                             "mount -t tmpfs -o size=%dm none /dev/shm\n",
 127                             ram_mb + 16);
 128                 } else {
 129                     fprintf(stderr,
 130                             "Use the '-m' option of QEMU to diminish the amount of virtual RAM or use the\n"
 131                             "QEMU_TMPDIR environment variable to set another directory where the QEMU\n"
 132                             "temporary RAM file will be opened.\n");
 133                 }
 134                 fprintf(stderr, "Or disable the accelerator module with -no-kqemu\n");
 135                 exit(1);
 136             }
 137         }
 138         snprintf(phys_ram_file, sizeof(phys_ram_file), "%s/qemuXXXXXX",
 139                  tmpdir);
 140         phys_ram_fd = mkstemp(phys_ram_file);
 141         if (phys_ram_fd < 0) {
 142             fprintf(stderr,
 143                     "warning: could not create temporary file in '%s'.\n"
 144                     "Use QEMU_TMPDIR to select a directory in a tmpfs filesystem.\n"
 145                     "Using '/tmp' as fallback.\n",
 146                     tmpdir);
 147             snprintf(phys_ram_file, sizeof(phys_ram_file), "%s/qemuXXXXXX",
 148                      "/tmp");
 149             phys_ram_fd = mkstemp(phys_ram_file);
 150             if (phys_ram_fd < 0) {
 151                 fprintf(stderr, "Could not create temporary memory file '%s'\n",
 152                         phys_ram_file);
 153                 exit(1);
 154             }
 155         }
 156         unlink(phys_ram_file);
 157     }
 158     size = (size + 4095) & ~4095;
 159     ftruncate(phys_ram_fd, phys_ram_size + size);
 160     ptr = mmap(NULL,
 161                size,
 162                PROT_WRITE | PROT_READ, MAP_SHARED,
 163                phys_ram_fd, phys_ram_size);
 164     if (ptr == MAP_FAILED) {
 165         fprintf(stderr, "Could not map physical memory\n");
 166         exit(1);
 167     }
 168     phys_ram_size += size;
 169     return ptr;
 170 }
 171
 172 static void kqemu_vfree(void *ptr)
 173 {
 174     /* may be useful some day, but currently we do not need to free */
 175 }
 176
 177 #endif
 178
 179 void *qemu_memalign(size_t alignment, size_t size)
 180 {
 181 #if defined(_POSIX_C_SOURCE)
 182     int ret;
 183     void *ptr;
 184     ret = posix_memalign(&ptr, alignment, size);
 185     if (ret != 0)
 186         return NULL;
 187     return ptr;
 188 #elif defined(_BSD)
 189     return valloc(size);
 190 #else
 191     return memalign(alignment, size);
 192 #endif
 193 }
 194
 195 /* alloc shared memory pages */
 196 void *qemu_vmalloc(size_t size)
 197 {
 198 #if defined(USE_KQEMU)
 199     if (kqemu_allowed)
 200         return kqemu_vmalloc(size);
 201 #endif
 202 #ifdef _BSD
 203     return valloc(size);
 204 #else
 205     return memalign(TARGET_PAGE_SIZE, size);
 206 #endif
 207 }
 208
 209 void qemu_vfree(void *ptr)
 210 {
 211 #if defined(USE_KQEMU)
 212     if (kqemu_allowed)
 213         kqemu_vfree(ptr);
 214 #endif
 215     free(ptr);
 216 }
 217
 218 #endif
 219
 220 void *qemu_mallocz(size_t size)
 221 {
 222     void *ptr;
 223     ptr = qemu_malloc(size);
 224     if (!ptr)
 225         return NULL;
 226     memset(ptr, 0, size);
 227     return ptr;
 228 }
 229
 230 char *qemu_strdup(const char *str)
 231 {
 232     char *ptr;
 233     ptr = qemu_malloc(strlen(str) + 1);
 234     if (!ptr)
 235         return NULL;
 236     strcpy(ptr, str);
 237     return ptr;
 238 }
 239
 240 int qemu_create_pidfile(const char *filename)
 241 {
 242     char buffer[128];
 243     int len;
 244 #ifndef _WIN32
 245     int fd;
 246
 247     fd = open(filename, O_RDWR | O_CREAT, 0600);
 248     if (fd == -1)
 249         return -1;
 250
 251     if (lockf(fd, F_TLOCK, 0) == -1)
 252         return -1;
 253
 254     len = snprintf(buffer, sizeof(buffer), "%ld\n", (long)getpid());
 255     if (write(fd, buffer, len) != len)
 256         return -1;
 257 #else
 258     HANDLE file;
 259     DWORD flags;
 260     OVERLAPPED overlap;
 261     BOOL ret;
 262
 263     /* Open for writing with no sharing. */
 264     file = CreateFile(filename, GENERIC_WRITE, 0, NULL,
 265                       OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
 266
 267     if (file == INVALID_HANDLE_VALUE)
 268       return -1;
 269
 270     flags = LOCKFILE_EXCLUSIVE_LOCK | LOCKFILE_FAIL_IMMEDIATELY;
 271     overlap.hEvent = 0;
 272     /* Lock 1 byte. */
 273     ret = LockFileEx(file, flags, 0, 0, 1, &overlap);
 274     if (ret == 0)
 275       return -1;
 276
 277     /* Write PID to file. */
 278     len = snprintf(buffer, sizeof(buffer), "%ld\n", (long)getpid());
 279     ret = WriteFileEx(file, (LPCVOID)buffer, (DWORD)len,
 280                       &overlap, NULL);
 281     if (ret == 0)
 282       return -1;
 283 #endif
 284     return 0;
 285 }
 286
 287 #ifdef _WIN32
 288
 289 /* Offset between 1/1/1601 and 1/1/1970 in 100 nanosec units */
 290 #define _W32_FT_OFFSET (116444736000000000ULL)
 291
 292 int qemu_gettimeofday(qemu_timeval *tp)
 293 {
 294   union {
 295     unsigned long long ns100; /*time since 1 Jan 1601 in 100ns units */
 296     FILETIME ft;
 297   }  _now;
 298
 299   if(tp)
 300     {
 301       GetSystemTimeAsFileTime (&_now.ft);
 302       tp->tv_usec=(long)((_now.ns100 / 10ULL) % 1000000ULL );
 303       tp->tv_sec= (long)((_now.ns100 - _W32_FT_OFFSET) / 10000000ULL);
 304     }
 305   /* Always return 0 as per Open Group Base Specifications Issue 6.
 306      Do not set errno on error.  */
 307   return 0;
 308 }
 309 #endif /* _WIN32 */