Merge upstream QEMU 10.0.50 into the Android source tree.

This change integrates many changes from the upstream QEMU sources.
Its main purpose is to enable correct ARMv6 and ARMv7 support to the
Android emulator. Due to the nature of the upstream code base, this
unfortunately also required changes to many other parts of the source.

Note that to ensure easier integrations in the future, some source files
and directories that have heavy Android-specific customization have been
renamed with an -android suffix. The original files are still there for
easier integration tracking, but *never* compiled. For example:

  net.c        net-android.c
  qemu-char.c  qemu-char-android.c
  slirp/       slirp-android/
  etc...

Tested on linux-x86, darwin-x86 and windows host machines.

1 files changed, 261 insertions, 0 deletions

diff --git a/buffered_file.c b/buffered_file.c
new file mode 100644
index 0000000..364b912
--- /dev/null
+++ b/buffered_file.c
@@ -0,0 +1,261 @@
+/*
+ * QEMU buffered QEMUFile
+ *
+ * Copyright IBM, Corp. 2008
+ *
+ * Authors:
+ *  Anthony Liguori   <aliguori@us.ibm.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2.  See
+ * the COPYING file in the top-level directory.
+ *
+ */
+
+#include "qemu-common.h"
+#include "hw/hw.h"
+#include "qemu-timer.h"
+#include "sysemu.h"
+#include "qemu-char.h"
+#include "buffered_file.h"
+
+//#define DEBUG_BUFFERED_FILE
+
+typedef struct QEMUFileBuffered
+{
+    BufferedPutFunc *put_buffer;
+    BufferedPutReadyFunc *put_ready;
+    BufferedWaitForUnfreezeFunc *wait_for_unfreeze;
+    BufferedCloseFunc *close;
+    void *opaque;
+    QEMUFile *file;
+    int has_error;
+    int freeze_output;
+    size_t bytes_xfer;
+    size_t xfer_limit;
+    uint8_t *buffer;
+    size_t buffer_size;
+    size_t buffer_capacity;
+    QEMUTimer *timer;
+} QEMUFileBuffered;
+
+#ifdef DEBUG_BUFFERED_FILE
+#define dprintf(fmt, ...) \
+    do { printf("buffered-file: " fmt, ## __VA_ARGS__); } while (0)
+#else
+#define dprintf(fmt, ...) \
+    do { } while (0)
+#endif
+
+static void buffered_append(QEMUFileBuffered *s,
+                            const uint8_t *buf, size_t size)
+{
+    if (size > (s->buffer_capacity - s->buffer_size)) {
+        void *tmp;
+
+        dprintf("increasing buffer capacity from %ld by %ld\n",
+                s->buffer_capacity, size + 1024);
+
+        s->buffer_capacity += size + 1024;
+
+        tmp = qemu_realloc(s->buffer, s->buffer_capacity);
+        if (tmp == NULL) {
+            fprintf(stderr, "qemu file buffer expansion failed\n");
+            exit(1);
+        }
+
+        s->buffer = tmp;
+    }
+
+    memcpy(s->buffer + s->buffer_size, buf, size);
+    s->buffer_size += size;
+}
+
+static void buffered_flush(QEMUFileBuffered *s)
+{
+    size_t offset = 0;
+
+    if (s->has_error) {
+        dprintf("flush when error, bailing\n");
+        return;
+    }
+
+    dprintf("flushing %ld byte(s) of data\n", s->buffer_size);
+
+    while (offset < s->buffer_size) {
+        ssize_t ret;
+
+        ret = s->put_buffer(s->opaque, s->buffer + offset,
+                            s->buffer_size - offset);
+        if (ret == -EAGAIN) {
+            dprintf("backend not ready, freezing\n");
+            s->freeze_output = 1;
+            break;
+        }
+
+        if (ret <= 0) {
+            dprintf("error flushing data, %ld\n", ret);
+            s->has_error = 1;
+            break;
+        } else {
+            dprintf("flushed %ld byte(s)\n", ret);
+            offset += ret;
+        }
+    }
+
+    dprintf("flushed %ld of %ld byte(s)\n", offset, s->buffer_size);
+    memmove(s->buffer, s->buffer + offset, s->buffer_size - offset);
+    s->buffer_size -= offset;
+}
+
+static int buffered_put_buffer(void *opaque, const uint8_t *buf, int64_t pos, int size)
+{
+    QEMUFileBuffered *s = opaque;
+    int offset = 0;
+    ssize_t ret;
+
+    dprintf("putting %ld bytes at %Ld\n", size, pos);
+
+    if (s->has_error) {
+        dprintf("flush when error, bailing\n");
+        return -EINVAL;
+    }
+
+    dprintf("unfreezing output\n");
+    s->freeze_output = 0;
+
+    buffered_flush(s);
+
+    while (!s->freeze_output && offset < size) {
+        if (s->bytes_xfer > s->xfer_limit) {
+            dprintf("transfer limit exceeded when putting\n");
+            break;
+        }
+
+        ret = s->put_buffer(s->opaque, buf + offset, size - offset);
+        if (ret == -EAGAIN) {
+            dprintf("backend not ready, freezing\n");
+            s->freeze_output = 1;
+            break;
+        }
+
+        if (ret <= 0) {
+            dprintf("error putting\n");
+            s->has_error = 1;
+            offset = -EINVAL;
+            break;
+        }
+
+        dprintf("put %ld byte(s)\n", ret);
+        offset += ret;
+        s->bytes_xfer += ret;
+    }
+
+    if (offset >= 0) {
+        dprintf("buffering %ld bytes\n", size - offset);
+        buffered_append(s, buf + offset, size - offset);
+        offset = size;
+    }
+
+    return offset;
+}
+
+static int buffered_close(void *opaque)
+{
+    QEMUFileBuffered *s = opaque;
+    int ret;
+
+    dprintf("closing\n");
+
+    while (!s->has_error && s->buffer_size) {
+        buffered_flush(s);
+        if (s->freeze_output)
+            s->wait_for_unfreeze(s);
+    }
+
+    ret = s->close(s->opaque);
+
+    qemu_del_timer(s->timer);
+    qemu_free_timer(s->timer);
+    qemu_free(s->buffer);
+    qemu_free(s);
+
+    return ret;
+}
+
+static int buffered_rate_limit(void *opaque)
+{
+    QEMUFileBuffered *s = opaque;
+
+    if (s->has_error)
+        return 0;
+
+    if (s->freeze_output)
+        return 1;
+
+    if (s->bytes_xfer > s->xfer_limit)
+        return 1;
+
+    return 0;
+}
+
+static size_t buffered_set_rate_limit(void *opaque, size_t new_rate)
+{
+    QEMUFileBuffered *s = opaque;
+
+    if (s->has_error)
+        goto out;
+
+    s->xfer_limit = new_rate / 10;
+    
+out:
+    return s->xfer_limit;
+}
+
+static void buffered_rate_tick(void *opaque)
+{
+    QEMUFileBuffered *s = opaque;
+
+    if (s->has_error)
+        return;
+
+    qemu_mod_timer(s->timer, qemu_get_clock(rt_clock) + 100);
+
+    if (s->freeze_output)
+        return;
+
+    s->bytes_xfer = 0;
+
+    buffered_flush(s);
+
+    /* Add some checks around this */
+    s->put_ready(s->opaque);
+}
+
+QEMUFile *qemu_fopen_ops_buffered(void *opaque,
+                                  size_t bytes_per_sec,
+                                  BufferedPutFunc *put_buffer,
+                                  BufferedPutReadyFunc *put_ready,
+                                  BufferedWaitForUnfreezeFunc *wait_for_unfreeze,
+                                  BufferedCloseFunc *close)
+{
+    QEMUFileBuffered *s;
+
+    s = qemu_mallocz(sizeof(*s));
+
+    s->opaque = opaque;
+    s->xfer_limit = bytes_per_sec / 10;
+    s->put_buffer = put_buffer;
+    s->put_ready = put_ready;
+    s->wait_for_unfreeze = wait_for_unfreeze;
+    s->close = close;
+
+    s->file = qemu_fopen_ops(s, buffered_put_buffer, NULL,
+                             buffered_close, buffered_rate_limit,
+                             buffered_set_rate_limit);
+
+    s->timer = qemu_new_timer(rt_clock, buffered_rate_tick, s);
+
+    qemu_mod_timer(s->timer, qemu_get_clock(rt_clock) + 100);
+
+    return s->file;
+}