Archipelago » qemu

/*

 * 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;

            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;

}

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 */