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
  31 #include "cpu.h"
  32 #if defined(USE_KQEMU)
  33 #include "vl.h"
  34 #endif
  35
  36 #ifdef _WIN32
  37 #include <windows.h>
  38 #elif defined(_BSD)
  39 #include <stdlib.h>
  40 #else
  41 #include <malloc.h>
  42 #endif
  43
  44 void *get_mmap_addr(unsigned long size)
  45 {
  46     return NULL;
  47 }
  48
  49 void qemu_free(void *ptr)
  50 {
  51     free(ptr);
  52 }
  53
  54 void *qemu_malloc(size_t size)
  55 {
  56     return malloc(size);
  57 }
  58
  59 #if defined(_WIN32)
  60
  61 void *qemu_vmalloc(size_t size)
  62 {
  63     /* FIXME: this is not exactly optimal solution since VirtualAlloc
  64        has 64Kb granularity, but at least it guarantees us that the
  65        memory is page aligned. */
  66     return VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE);
  67 }
  68
  69 void qemu_vfree(void *ptr)
  70 {
  71     VirtualFree(ptr, 0, MEM_RELEASE);
  72 }
  73
  74 #else
  75
  76 #if defined(USE_KQEMU)
  77
  78 #include <sys/vfs.h>
  79 #include <sys/mman.h>
  80 #include <fcntl.h>
  81
  82 void *kqemu_vmalloc(size_t size)
  83 {
  84     static int phys_ram_fd = -1;
  85     static int phys_ram_size = 0;
  86     const char *tmpdir;
  87     char phys_ram_file[1024];
  88     void *ptr;
  89     struct statfs stfs;
  90
  91     if (phys_ram_fd < 0) {
  92         tmpdir = getenv("QEMU_TMPDIR");
  93         if (!tmpdir)
  94             tmpdir = "/dev/shm";
  95         if (statfs(tmpdir, &stfs) == 0) {
  96             int64_t free_space;
  97             int ram_mb;
  98
  99             extern int ram_size;
 100             free_space = (int64_t)stfs.f_bavail * stfs.f_bsize;
 101             if ((ram_size + 8192 * 1024) >= free_space) {
 102                 ram_mb = (ram_size / (1024 * 1024));
 103                 fprintf(stderr,
 104                         "You do not have enough space in '%s' for the %d MB of QEMU virtual RAM.\n",
 105                         tmpdir, ram_mb);
 106                 if (strcmp(tmpdir, "/dev/shm") == 0) {
 107                     fprintf(stderr, "To have more space available provided you have enough RAM and swap, do as root:\n"
 108                             "umount /dev/shm\n"
 109                             "mount -t tmpfs -o size=%dm none /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         if (mkstemp(phys_ram_file) < 0) {
 124             fprintf(stderr,
 125                     "warning: could not create temporary file in '%s'.\n"
 126                     "Use QEMU_TMPDIR to select a directory in a tmpfs filesystem.\n"
 127                     "Using '/tmp' as fallback.\n",
 128                     tmpdir);
 129             snprintf(phys_ram_file, sizeof(phys_ram_file), "%s/qemuXXXXXX",
 130                      "/tmp");
 131             if (mkstemp(phys_ram_file) < 0) {
 132                 fprintf(stderr, "Could not create temporary memory file '%s'\n",
 133                         phys_ram_file);
 134                 exit(1);
 135             }
 136         }
 137         phys_ram_fd = open(phys_ram_file, O_CREAT | O_TRUNC | O_RDWR, 0600);
 138         if (phys_ram_fd < 0) {
 139             fprintf(stderr, "Could not open temporary memory file '%s'\n",
 140                     phys_ram_file);
 141             exit(1);
 142         }
 143         unlink(phys_ram_file);
 144     }
 145     size = (size + 4095) & ~4095;
 146     ftruncate(phys_ram_fd, phys_ram_size + size);
 147     ptr = mmap(NULL,
 148                size,
 149                PROT_WRITE | PROT_READ, MAP_SHARED,
 150                phys_ram_fd, phys_ram_size);
 151     if (ptr == MAP_FAILED) {
 152         fprintf(stderr, "Could not map physical memory\n");
 153         exit(1);
 154     }
 155     phys_ram_size += size;
 156     return ptr;
 157 }
 158
 159 void kqemu_vfree(void *ptr)
 160 {
 161     /* may be useful some day, but currently we do not need to free */
 162 }
 163
 164 #endif
 165
 166 /* alloc shared memory pages */
 167 void *qemu_vmalloc(size_t size)
 168 {
 169 #if defined(USE_KQEMU)
 170     if (kqemu_allowed)
 171         return kqemu_vmalloc(size);
 172 #endif
 173 #ifdef _BSD
 174     return valloc(size);
 175 #else
 176     return memalign(4096, size);
 177 #endif
 178 }
 179
 180 void qemu_vfree(void *ptr)
 181 {
 182 #if defined(USE_KQEMU)
 183     if (kqemu_allowed)
 184         kqemu_vfree(ptr);
 185 #endif
 186     free(ptr);
 187 }
 188
 189 #endif
 190
 191 void *qemu_mallocz(size_t size)
 192 {
 193     void *ptr;
 194     ptr = qemu_malloc(size);
 195     if (!ptr)
 196         return NULL;
 197     memset(ptr, 0, size);
 198     return ptr;
 199 }
 200
 201 char *qemu_strdup(const char *str)
 202 {
 203     char *ptr;
 204     ptr = qemu_malloc(strlen(str) + 1);
 205     if (!ptr)
 206         return NULL;
 207     strcpy(ptr, str);
 208     return ptr;
 209 }