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 "cpu.h"
  37 #if defined(USE_KQEMU)
  38 #include "vl.h"
  39 #endif
  40
  41 #ifdef _WIN32
  42 #include <windows.h>
  43 #elif defined(_BSD)
  44 #include <stdlib.h>
  45 #else
  46 #include <malloc.h>
  47 #endif
  48
  49 void *get_mmap_addr(unsigned long size)
  50 {
  51     return NULL;
  52 }
  53
  54 void qemu_free(void *ptr)
  55 {
  56     free(ptr);
  57 }
  58
  59 void *qemu_malloc(size_t size)
  60 {
  61     return malloc(size);
  62 }
  63
  64 #if defined(_WIN32)
  65
  66 void *qemu_vmalloc(size_t size)
  67 {
  68     /* FIXME: this is not exactly optimal solution since VirtualAlloc
  69        has 64Kb granularity, but at least it guarantees us that the
  70        memory is page aligned. */
  71     return VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE);
  72 }
  73
  74 void qemu_vfree(void *ptr)
  75 {
  76     VirtualFree(ptr, 0, MEM_RELEASE);
  77 }
  78
  79 #else
  80
  81 #if defined(USE_KQEMU)
  82
  83 #include <sys/vfs.h>
  84 #include <sys/mman.h>
  85 #include <fcntl.h>
  86
  87 void *kqemu_vmalloc(size_t size)
  88 {
  89     static int phys_ram_fd = -1;
  90     static int phys_ram_size = 0;
  91     const char *tmpdir;
  92     char phys_ram_file[1024];
  93     void *ptr;
  94 #ifdef HOST_SOLARIS
  95     struct statvfs stfs;
  96 #else
  97     struct statfs stfs;
  98 #endif
  99
 100     if (phys_ram_fd < 0) {
 101         tmpdir = getenv("QEMU_TMPDIR");
 102         if (!tmpdir)
 103 #ifdef HOST_SOLARIS
 104             tmpdir = "/tmp";
 105         if (statvfs(tmpdir, &stfs) == 0) {
 106 #else
 107             tmpdir = "/dev/shm";
 108         if (statfs(tmpdir, &stfs) == 0) {
 109 #endif
 110             int64_t free_space;
 111             int ram_mb;
 112
 113             extern int ram_size;
 114             free_space = (int64_t)stfs.f_bavail * stfs.f_bsize;
 115             if ((ram_size + 8192 * 1024) >= free_space) {
 116                 ram_mb = (ram_size / (1024 * 1024));
 117                 fprintf(stderr,
 118                         "You do not have enough space in '%s' for the %d MB of QEMU virtual RAM.\n",
 119                         tmpdir, ram_mb);
 120                 if (strcmp(tmpdir, "/dev/shm") == 0) {
 121                     fprintf(stderr, "To have more space available provided you have enough RAM and swap, do as root:\n"
 122                             "umount /dev/shm\n"
 123                             "mount -t tmpfs -o size=%dm none /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");
 130                 }
 131                 fprintf(stderr, "Or disable the accelerator module with -no-kqemu\n");
 132                 exit(1);
 133             }
 134         }
 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);
 151             }
 152         }
 153         unlink(phys_ram_file);
 154     }
 155     size = (size + 4095) & ~4095;
 156     ftruncate(phys_ram_fd, phys_ram_size + size);
 157     ptr = mmap(NULL,
 158                size,
 159                PROT_WRITE | PROT_READ, MAP_SHARED,
 160                phys_ram_fd, phys_ram_size);
 161     if (ptr == MAP_FAILED) {
 162         fprintf(stderr, "Could not map physical memory\n");
 163         exit(1);
 164     }
 165     phys_ram_size += size;
 166     return ptr;
 167 }
 168
 169 void kqemu_vfree(void *ptr)
 170 {
 171     /* may be useful some day, but currently we do not need to free */
 172 }
 173
 174 #endif
 175
 176 /* alloc shared memory pages */
 177 void *qemu_vmalloc(size_t size)
 178 {
 179 #if defined(USE_KQEMU)
 180     if (kqemu_allowed)
 181         return kqemu_vmalloc(size);
 182 #endif
 183 #ifdef _BSD
 184     return valloc(size);
 185 #else
 186     return memalign(4096, size);
 187 #endif
 188 }
 189
 190 void qemu_vfree(void *ptr)
 191 {
 192 #if defined(USE_KQEMU)
 193     if (kqemu_allowed)
 194         kqemu_vfree(ptr);
 195 #endif
 196     free(ptr);
 197 }
 198
 199 #endif
 200
 201 void *qemu_mallocz(size_t size)
 202 {
 203     void *ptr;
 204     ptr = qemu_malloc(size);
 205     if (!ptr)
 206         return NULL;
 207     memset(ptr, 0, size);
 208     return ptr;
 209 }
 210
 211 char *qemu_strdup(const char *str)
 212 {
 213     char *ptr;
 214     ptr = qemu_malloc(strlen(str) + 1);
 215     if (!ptr)
 216         return NULL;
 217     strcpy(ptr, str);
 218     return ptr;
 219 }
 220
 221 int qemu_create_pidfile(const char *filename)
 222 {
 223     char buffer[128];
 224     int len;
 225 #ifndef _WIN32
 226     int fd;
 227
 228     fd = open(filename, O_RDWR | O_CREAT, 0600);
 229     if (fd == -1)
 230         return -1;
 231
 232     if (lockf(fd, F_TLOCK, 0) == -1)
 233         return -1;
 234
 235     len = snprintf(buffer, sizeof(buffer), "%ld\n", (long)getpid());
 236     if (write(fd, buffer, len) != len)
 237         return -1;
 238 #else
 239     HANDLE file;
 240     DWORD flags;
 241     OVERLAPPED overlap;
 242     BOOL ret;
 243
 244     /* Open for writing with no sharing. */
 245     file = CreateFile(filename, GENERIC_WRITE, 0, NULL,
 246                       OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
 247
 248     if (file == INVALID_HANDLE_VALUE)
 249       return -1;
 250
 251     flags = LOCKFILE_EXCLUSIVE_LOCK | LOCKFILE_FAIL_IMMEDIATELY;
 252     overlap.hEvent = 0;
 253     /* Lock 1 byte. */
 254     ret = LockFileEx(file, flags, 0, 0, 1, &overlap);
 255     if (ret == 0)
 256       return -1;
 257
 258     /* Write PID to file. */
 259     len = snprintf(buffer, sizeof(buffer), "%ld\n", (long)getpid());
 260     ret = WriteFileEx(file, (LPCVOID)buffer, (DWORD)len,
 261                       &overlap, NULL);
 262     if (ret == 0)
 263       return -1;
 264 #endif
 265     return 0;
 266 }