void qemu_vfree(void *ptr)
{
#if defined(USE_KQEMU)
if (kqemu_allowed)
kqemu_vfree(ptr);
#endif
free(ptr);
}
void *kqemu_vmalloc(size_t size)
{
static int phys_ram_fd = -1;
static int phys_ram_size = 0;
const char *tmpdir;
char phys_ram_file[1024];
void *ptr;
#ifdef HOST_SOLARIS
struct statvfs stfs;
#else
struct statfs stfs;
#endif
if (phys_ram_fd < 0) {
tmpdir = getenv("QEMU_TMPDIR");
if (!tmpdir)
#ifdef HOST_SOLARIS
tmpdir = "/tmp";
if (statvfs(tmpdir, &stfs) == 0) {
#else
tmpdir = "/dev/shm";
if (statfs(tmpdir, &stfs) == 0) {
#endif
int64_t free_space;
int ram_mb;
extern int ram_size;
free_space = (int64_t)stfs.f_bavail * stfs.f_bsize;
if ((ram_size + 8192 * 1024) >= free_space) {
ram_mb = (ram_size / (1024 * 1024));
fprintf(stderr,
"You do not have enough space in '%s' for the %d MB of QEMU virtual RAM.\n",
tmpdir, ram_mb);
if (strcmp(tmpdir, "/dev/shm") == 0) {
fprintf(stderr, "To have more space available provided you have enough RAM and swap, do as root:\n"
"umount /dev/shm\n"
"mount -t tmpfs -o size=%dm none /dev/shm\n",
ram_mb + 16);
} else {
fprintf(stderr,
"Use the '-m' option of QEMU to diminish the amount of virtual RAM or use the\n"
"QEMU_TMPDIR environment variable to set another directory where the QEMU\n"
"temporary RAM file will be opened.\n");
}
fprintf(stderr, "Or disable the accelerator module with -no-kqemu\n");
exit(1);
}
}
snprintf(phys_ram_file, sizeof(phys_ram_file), "%s/qemuXXXXXX",
tmpdir);
phys_ram_fd = mkstemp(phys_ram_file);
if (phys_ram_fd < 0) {
fprintf(stderr,
"warning: could not create temporary file in '%s'.\n"
"Use QEMU_TMPDIR to select a directory in a tmpfs filesystem.\n"
"Using '/tmp' as fallback.\n",
tmpdir);
snprintf(phys_ram_file, sizeof(phys_ram_file), "%s/qemuXXXXXX",
"/tmp");
phys_ram_fd = mkstemp(phys_ram_file);
if (phys_ram_fd < 0) {
fprintf(stderr, "Could not create temporary memory file '%s'\n",
phys_ram_file);
exit(1);
}
}
unlink(phys_ram_file);
}
size = (size + 4095) & ~4095;
ftruncate(phys_ram_fd, phys_ram_size + size);
ptr = mmap(NULL,
size,
PROT_WRITE | PROT_READ, MAP_SHARED,
phys_ram_fd, phys_ram_size);
if (ptr == MAP_FAILED) {
fprintf(stderr, "Could not map physical memory\n");
exit(1);
}
phys_ram_size += size;
return ptr;
}
void kqemu_vfree(void *ptr)
{
/* may be useful some day, but currently we do not need to free */
}
#endif
/* alloc shared memory pages */
void *qemu_vmalloc(size_t size)
{
#if defined(USE_KQEMU)
if (kqemu_allowed)
return kqemu_vmalloc(size);
#endif
#ifdef _BSD
return valloc(size);
#else
return memalign(4096, size);
#endif
}
void qemu_vfree(void *ptr)
{
#if defined(USE_KQEMU)
if (kqemu_allowed)
kqemu_vfree(ptr);
#endif
free(ptr);
}
#endif
void *qemu_mallocz(size_t size)
{
void *ptr;
ptr = qemu_malloc(size);
if (!ptr)
return NULL;
memset(ptr, 0, size);
return ptr;
}