mirror of
https://github.com/xemu-project/xemu.git
synced 2024-11-30 15:00:34 +00:00
00f82b8a31
Anthony Liguori. git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@4265 c046a42c-6fe2-441c-8c8c-71466251a162
273 lines
7.4 KiB
C
273 lines
7.4 KiB
C
/*
|
|
* QEMU low level functions
|
|
*
|
|
* Copyright (c) 2003 Fabrice Bellard
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
* of this software and associated documentation files (the "Software"), to deal
|
|
* in the Software without restriction, including without limitation the rights
|
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
* copies of the Software, and to permit persons to whom the Software is
|
|
* furnished to do so, subject to the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be included in
|
|
* all copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
|
|
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
|
* THE SOFTWARE.
|
|
*/
|
|
#include <stdlib.h>
|
|
#include <stdio.h>
|
|
#include <stdarg.h>
|
|
#include <string.h>
|
|
#include <errno.h>
|
|
#include <unistd.h>
|
|
#include <fcntl.h>
|
|
#ifdef HOST_SOLARIS
|
|
#include <sys/types.h>
|
|
#include <sys/statvfs.h>
|
|
#endif
|
|
|
|
#include "qemu-common.h"
|
|
#include "sysemu.h"
|
|
|
|
#ifdef _WIN32
|
|
#define WIN32_LEAN_AND_MEAN
|
|
#include <windows.h>
|
|
#elif defined(_BSD)
|
|
#include <stdlib.h>
|
|
#else
|
|
#include <malloc.h>
|
|
#endif
|
|
|
|
#if defined(_WIN32)
|
|
void *qemu_memalign(size_t alignment, size_t size)
|
|
{
|
|
return VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE);
|
|
}
|
|
|
|
void *qemu_vmalloc(size_t size)
|
|
{
|
|
/* FIXME: this is not exactly optimal solution since VirtualAlloc
|
|
has 64Kb granularity, but at least it guarantees us that the
|
|
memory is page aligned. */
|
|
return VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE);
|
|
}
|
|
|
|
void qemu_vfree(void *ptr)
|
|
{
|
|
VirtualFree(ptr, 0, MEM_RELEASE);
|
|
}
|
|
|
|
#else
|
|
|
|
#if defined(USE_KQEMU)
|
|
|
|
#include <sys/vfs.h>
|
|
#include <sys/mman.h>
|
|
#include <fcntl.h>
|
|
|
|
static 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;
|
|
|
|
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"
|
|
"mount -o remount,size=%dm /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;
|
|
}
|
|
|
|
static void kqemu_vfree(void *ptr)
|
|
{
|
|
/* may be useful some day, but currently we do not need to free */
|
|
}
|
|
|
|
#endif
|
|
|
|
void *qemu_memalign(size_t alignment, size_t size)
|
|
{
|
|
#if defined(_POSIX_C_SOURCE)
|
|
int ret;
|
|
void *ptr;
|
|
ret = posix_memalign(&ptr, alignment, size);
|
|
if (ret != 0)
|
|
return NULL;
|
|
return ptr;
|
|
#elif defined(_BSD)
|
|
return valloc(size);
|
|
#else
|
|
return memalign(alignment, size);
|
|
#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
|
|
|
|
int qemu_create_pidfile(const char *filename)
|
|
{
|
|
char buffer[128];
|
|
int len;
|
|
#ifndef _WIN32
|
|
int fd;
|
|
|
|
fd = open(filename, O_RDWR | O_CREAT, 0600);
|
|
if (fd == -1)
|
|
return -1;
|
|
|
|
if (lockf(fd, F_TLOCK, 0) == -1)
|
|
return -1;
|
|
|
|
len = snprintf(buffer, sizeof(buffer), "%ld\n", (long)getpid());
|
|
if (write(fd, buffer, len) != len)
|
|
return -1;
|
|
#else
|
|
HANDLE file;
|
|
DWORD flags;
|
|
OVERLAPPED overlap;
|
|
BOOL ret;
|
|
|
|
/* Open for writing with no sharing. */
|
|
file = CreateFile(filename, GENERIC_WRITE, 0, NULL,
|
|
OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
|
|
|
|
if (file == INVALID_HANDLE_VALUE)
|
|
return -1;
|
|
|
|
flags = LOCKFILE_EXCLUSIVE_LOCK | LOCKFILE_FAIL_IMMEDIATELY;
|
|
overlap.hEvent = 0;
|
|
/* Lock 1 byte. */
|
|
ret = LockFileEx(file, flags, 0, 0, 1, &overlap);
|
|
if (ret == 0)
|
|
return -1;
|
|
|
|
/* Write PID to file. */
|
|
len = snprintf(buffer, sizeof(buffer), "%ld\n", (long)getpid());
|
|
ret = WriteFileEx(file, (LPCVOID)buffer, (DWORD)len,
|
|
&overlap, NULL);
|
|
if (ret == 0)
|
|
return -1;
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
#ifdef _WIN32
|
|
|
|
/* Offset between 1/1/1601 and 1/1/1970 in 100 nanosec units */
|
|
#define _W32_FT_OFFSET (116444736000000000ULL)
|
|
|
|
int qemu_gettimeofday(qemu_timeval *tp)
|
|
{
|
|
union {
|
|
unsigned long long ns100; /*time since 1 Jan 1601 in 100ns units */
|
|
FILETIME ft;
|
|
} _now;
|
|
|
|
if(tp)
|
|
{
|
|
GetSystemTimeAsFileTime (&_now.ft);
|
|
tp->tv_usec=(long)((_now.ns100 / 10ULL) % 1000000ULL );
|
|
tp->tv_sec= (long)((_now.ns100 - _W32_FT_OFFSET) / 10000000ULL);
|
|
}
|
|
/* Always return 0 as per Open Group Base Specifications Issue 6.
|
|
Do not set errno on error. */
|
|
return 0;
|
|
}
|
|
#endif /* _WIN32 */
|