mirror of https://gitee.com/openkylin/qemu.git
314 lines
8.2 KiB
C
314 lines
8.2 KiB
C
/*
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* QEMU low level functions
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*
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* Copyright (c) 2003 Fabrice Bellard
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <stdarg.h>
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#include <string.h>
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#include <errno.h>
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#include <unistd.h>
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#include <fcntl.h>
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#ifdef HOST_SOLARIS
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#include <sys/types.h>
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#include <sys/statvfs.h>
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#endif
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/* Needed early for _BSD etc. */
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#include "config-host.h"
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#ifdef _WIN32
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#define WIN32_LEAN_AND_MEAN
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#include <windows.h>
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#elif defined(_BSD)
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#include <stdlib.h>
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#else
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#include <malloc.h>
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#endif
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#include "qemu-common.h"
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#include "sysemu.h"
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#include "qemu_socket.h"
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#if defined(_WIN32)
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void *qemu_memalign(size_t alignment, size_t size)
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{
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return VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE);
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}
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void *qemu_vmalloc(size_t size)
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{
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/* FIXME: this is not exactly optimal solution since VirtualAlloc
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has 64Kb granularity, but at least it guarantees us that the
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memory is page aligned. */
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return VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE);
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}
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void qemu_vfree(void *ptr)
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{
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VirtualFree(ptr, 0, MEM_RELEASE);
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}
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#else
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#if defined(USE_KQEMU)
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#ifdef __OpenBSD__
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#include <sys/param.h>
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#include <sys/types.h>
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#include <sys/mount.h>
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#else
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#ifndef __FreeBSD__
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#include <sys/vfs.h>
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#endif
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#endif
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#include <sys/mman.h>
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#include <fcntl.h>
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static void *kqemu_vmalloc(size_t size)
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{
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static int phys_ram_fd = -1;
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static int phys_ram_size = 0;
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void *ptr;
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/* no need (?) for a dummy file on OpenBSD/FreeBSD */
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#if defined(__OpenBSD__) || defined(__FreeBSD__)
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int map_anon = MAP_ANON;
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#else
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int map_anon = 0;
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const char *tmpdir;
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char phys_ram_file[1024];
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#ifdef HOST_SOLARIS
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struct statvfs stfs;
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#else
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struct statfs stfs;
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#endif
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if (phys_ram_fd < 0) {
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tmpdir = getenv("QEMU_TMPDIR");
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if (!tmpdir)
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#ifdef HOST_SOLARIS
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tmpdir = "/tmp";
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if (statvfs(tmpdir, &stfs) == 0) {
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#else
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tmpdir = "/dev/shm";
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if (statfs(tmpdir, &stfs) == 0) {
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#endif
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int64_t free_space;
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int ram_mb;
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free_space = (int64_t)stfs.f_bavail * stfs.f_bsize;
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if ((ram_size + 8192 * 1024) >= free_space) {
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ram_mb = (ram_size / (1024 * 1024));
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fprintf(stderr,
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"You do not have enough space in '%s' for the %d MB of QEMU virtual RAM.\n",
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tmpdir, ram_mb);
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if (strcmp(tmpdir, "/dev/shm") == 0) {
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fprintf(stderr, "To have more space available provided you have enough RAM and swap, do as root:\n"
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"mount -o remount,size=%dm /dev/shm\n",
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ram_mb + 16);
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} else {
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fprintf(stderr,
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"Use the '-m' option of QEMU to diminish the amount of virtual RAM or use the\n"
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"QEMU_TMPDIR environment variable to set another directory where the QEMU\n"
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"temporary RAM file will be opened.\n");
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}
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fprintf(stderr, "Or disable the accelerator module with -no-kqemu\n");
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exit(1);
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}
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}
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snprintf(phys_ram_file, sizeof(phys_ram_file), "%s/qemuXXXXXX",
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tmpdir);
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phys_ram_fd = mkstemp(phys_ram_file);
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if (phys_ram_fd < 0) {
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fprintf(stderr,
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"warning: could not create temporary file in '%s'.\n"
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"Use QEMU_TMPDIR to select a directory in a tmpfs filesystem.\n"
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"Using '/tmp' as fallback.\n",
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tmpdir);
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snprintf(phys_ram_file, sizeof(phys_ram_file), "%s/qemuXXXXXX",
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"/tmp");
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phys_ram_fd = mkstemp(phys_ram_file);
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if (phys_ram_fd < 0) {
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fprintf(stderr, "Could not create temporary memory file '%s'\n",
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phys_ram_file);
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exit(1);
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}
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}
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unlink(phys_ram_file);
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}
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size = (size + 4095) & ~4095;
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ftruncate(phys_ram_fd, phys_ram_size + size);
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#endif /* !(__OpenBSD__ || __FreeBSD__) */
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ptr = mmap(NULL,
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size,
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PROT_WRITE | PROT_READ, map_anon | MAP_SHARED,
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phys_ram_fd, phys_ram_size);
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if (ptr == MAP_FAILED) {
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fprintf(stderr, "Could not map physical memory\n");
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exit(1);
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}
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phys_ram_size += size;
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return ptr;
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}
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static void kqemu_vfree(void *ptr)
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{
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/* may be useful some day, but currently we do not need to free */
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}
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#endif
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void *qemu_memalign(size_t alignment, size_t size)
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{
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#if defined(_POSIX_C_SOURCE)
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int ret;
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void *ptr;
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ret = posix_memalign(&ptr, alignment, size);
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if (ret != 0)
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return NULL;
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return ptr;
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#elif defined(_BSD)
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return valloc(size);
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#else
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return memalign(alignment, size);
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#endif
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}
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/* alloc shared memory pages */
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void *qemu_vmalloc(size_t size)
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{
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#if defined(USE_KQEMU)
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if (kqemu_allowed)
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return kqemu_vmalloc(size);
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#endif
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return qemu_memalign(getpagesize(), size);
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}
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void qemu_vfree(void *ptr)
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{
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#if defined(USE_KQEMU)
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if (kqemu_allowed)
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kqemu_vfree(ptr);
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#endif
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free(ptr);
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}
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#endif
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int qemu_create_pidfile(const char *filename)
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{
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char buffer[128];
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int len;
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#ifndef _WIN32
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int fd;
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fd = open(filename, O_RDWR | O_CREAT, 0600);
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if (fd == -1)
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return -1;
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if (lockf(fd, F_TLOCK, 0) == -1)
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return -1;
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len = snprintf(buffer, sizeof(buffer), "%ld\n", (long)getpid());
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if (write(fd, buffer, len) != len)
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return -1;
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#else
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HANDLE file;
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DWORD flags;
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OVERLAPPED overlap;
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BOOL ret;
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/* Open for writing with no sharing. */
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file = CreateFile(filename, GENERIC_WRITE, 0, NULL,
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OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
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if (file == INVALID_HANDLE_VALUE)
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return -1;
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flags = LOCKFILE_EXCLUSIVE_LOCK | LOCKFILE_FAIL_IMMEDIATELY;
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overlap.hEvent = 0;
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/* Lock 1 byte. */
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ret = LockFileEx(file, flags, 0, 0, 1, &overlap);
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if (ret == 0)
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return -1;
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/* Write PID to file. */
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len = snprintf(buffer, sizeof(buffer), "%ld\n", (long)getpid());
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ret = WriteFileEx(file, (LPCVOID)buffer, (DWORD)len,
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&overlap, NULL);
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if (ret == 0)
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return -1;
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#endif
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return 0;
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}
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#ifdef _WIN32
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/* Offset between 1/1/1601 and 1/1/1970 in 100 nanosec units */
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#define _W32_FT_OFFSET (116444736000000000ULL)
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int qemu_gettimeofday(qemu_timeval *tp)
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{
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union {
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unsigned long long ns100; /*time since 1 Jan 1601 in 100ns units */
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FILETIME ft;
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} _now;
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if(tp)
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{
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GetSystemTimeAsFileTime (&_now.ft);
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tp->tv_usec=(long)((_now.ns100 / 10ULL) % 1000000ULL );
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tp->tv_sec= (long)((_now.ns100 - _W32_FT_OFFSET) / 10000000ULL);
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}
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/* Always return 0 as per Open Group Base Specifications Issue 6.
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Do not set errno on error. */
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return 0;
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}
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#endif /* _WIN32 */
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#ifdef _WIN32
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void socket_set_nonblock(int fd)
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{
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unsigned long opt = 1;
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ioctlsocket(fd, FIONBIO, &opt);
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}
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int inet_aton(const char *cp, struct in_addr *ia)
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{
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uint32_t addr = inet_addr(cp);
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if (addr == 0xffffffff)
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return 0;
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ia->s_addr = addr;
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return 1;
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}
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#else
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void socket_set_nonblock(int fd)
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{
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int f;
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f = fcntl(fd, F_GETFL);
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fcntl(fd, F_SETFL, f | O_NONBLOCK);
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}
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#endif
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