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>

#ifdef HOST_SOLARIS

#include <sys/types.h>

#include <sys/statvfs.h>

#endif

#include "cpu.h"

#if defined(USE_KQEMU)

#include "vl.h"

#endif

#ifdef _WIN32

#include <windows.h>

#elif defined(_BSD)

#include <stdlib.h>

#else

#include <malloc.h>

#endif

void *get_mmap_addr(unsigned long size)

{

    return NULL;

}

void qemu_free(void *ptr)

{

    free(ptr);

}

void *qemu_malloc(size_t size)

{

    return malloc(size);

}

#if defined(_WIN32)

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>

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;

}

char *qemu_strdup(const char *str)

{

    char *ptr;

    ptr = qemu_malloc(strlen(str) + 1);

    if (!ptr)

        return NULL;

    strcpy(ptr, str);

    return ptr;

}