diff --git a/qemu.h b/qemu.h
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--- /dev/null
+++ b/qemu.h
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+/*
+ * Copyright (C) 2008 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#ifndef _libs_hardware_qemu_h
+#define _libs_hardware_qemu_h
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifdef QEMU_HARDWARE
+
+/* returns 1 iff we're running in the emulator */
+extern int  qemu_check(void);
+
+/* a structure used to hold enough state to connect to a given
+ * QEMU communication channel, either through a qemud socket or
+ * a serial port.
+ *
+ * initialize the structure by zero-ing it out
+ */
+typedef struct {
+    char   is_inited;
+    char   is_available;
+    char   is_qemud;
+    char   is_tty;
+    char   device[32];
+} QemuChannel;
+
+/* try to open a qemu communication channel.
+ * returns a file descriptor on success, or -1 in case of
+ * error.
+ *
+ * 'channel' must be a QemuChannel structure that is empty
+ * on the first call. You can call this function several
+ * time to re-open the channel using the same 'channel'
+ * object to speed things a bit.
+ */
+extern int  qemu_channel_open( QemuChannel*  channel,
+                               const char*   name,
+                               int           mode );
+
+/* create a command made of a 4-hexchar prefix followed
+ * by the content. the prefix contains the content's length
+ * in hexadecimal coding.
+ *
+ * 'buffer' must be at last 6 bytes
+ * returns -1 in case of overflow, or the command's total length
+ * otherwise (i.e. content length + 4)
+ */
+extern int  qemu_command_format( char*        buffer, 
+                                 int          buffer_size,
+                                 const char*  format,
+                                 ... );
+
+/* directly sends a command through the 'control' channel.
+ * this will open the channel, send the formatted command, then
+ * close the channel automatically.
+ * returns 0 on success, or -1 on error.
+ */
+extern int  qemu_control_command( const char*  fmt, ... );
+
+/* sends a question to the control channel, then receive an answer in
+ * a user-allocated buffer. returns the lenght of the answer, or -1
+ * in case of error.
+ *
+ * 'question' *must* have been formatted through qemu_command_format
+ */
+extern int  qemu_control_query( const char*  question, int  questionlen,
+                                char*        answer,   int  answersize );
+
+#endif /* QEMU_HARDWARE */
+
+/* use QEMU_FALLBACK(call) to call a QEMU-specific callback  */
+/* use QEMU_FALLBACK_VOID(call) if the function returns void */
+#ifdef QEMU_HARDWARE
+#  define  QEMU_FALLBACK(x)  \
+    do { \
+        if (qemu_check()) \
+            return qemu_ ## x ; \
+    } while (0)
+#  define  QEMU_FALLBACK_VOID(x)  \
+    do { \
+        if (qemu_check()) { \
+            qemu_ ## x ; \
+            return; \
+        } \
+    } while (0)
+#else
+#  define  QEMU_FALLBACK(x)       ((void)0)
+#  define  QEMU_FALLBACK_VOID(x)  ((void)0)
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _libs_hardware_qemu_h */