auto import from //depot/cupcake/@135843

1 files changed, 288 insertions, 0 deletions

diff --git a/osdep.c b/osdep.c
new file mode 100644
index 0000000..49193e9
--- /dev/null
+++ b/osdep.c
@@ -0,0 +1,288 @@
+/*
+ * 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)
+
+#ifdef __OpenBSD__
+#include <sys/param.h>
+#include <sys/types.h>
+#include <sys/mount.h>
+#else
+#include <sys/vfs.h>
+#endif
+
+#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;
+    void *ptr;
+
+#ifdef __OpenBSD__ /* no need (?) for a dummy file on OpenBSD */
+    int map_anon = MAP_ANON;
+#else
+    int map_anon = 0;
+    const char *tmpdir;
+    char phys_ram_file[1024];
+#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);
+#endif /* !__OpenBSD__ */
+    ptr = mmap(NULL,
+               size,
+               PROT_WRITE | PROT_READ, map_anon | 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 */
+
+