audio: initial hda driver and oss interface

kernel-src/include/kernel/audio.h

@@ -0,0 +1,49 @@
+#ifndef _AUDIO_H
+#define _AUDIO_H
+
+#include <ringbuffer.h>
+#include <mutex.h>
+#include <stdbool.h>
+#include <kernel/poll.h>
+
+typedef struct audio_stream audio_stream_t;
+
+#define AUDIO_STREAM_INFO_FRAGMENT_SIZE 1
+#define AUDIO_STREAM_INFO_SPEED 2
+#define AUDIO_STREAM_INFO_CHANNELS 3
+#define AUDIO_STREAM_INFO_FORMAT 4
+#define AUDIO_STREAM_INFO_FIFO_FRAMES 5
+#define AUDIO_STREAM_INFO_PLAYED_FRAMES 6
+
+#define AUDIO_FORMAT_S16_LE 0x10
+
+#define AUDIO_TRIGGER_INPUT 1
+#define AUDIO_TRIGGER_OUTPUT 2
+
+typedef struct {
+	void (*start)(audio_stream_t *);
+	void (*stop)(audio_stream_t *);
+	void (*wait_for_playback)(audio_stream_t *);
+	void (*reset)(audio_stream_t *);
+	void (*get_info)(audio_stream_t *, int what, void *buf);
+} audio_stream_ops_t;
+
+typedef struct audio_stream {
+	mutex_t mutex;
+	ringbuffer_t ringbuffer;
+	pollheader_t pollheader;
+	audio_stream_ops_t *ops;
+	bool opened;
+	bool playing;
+	int trigger;
+	size_t underruns;
+	size_t bytes_submitted;
+	size_t bytes_written;
+	size_t bytes_played;
+} audio_stream_t;
+
+bool audio_take_stream_data(audio_stream_t *stream, void *buffer, size_t size);
+int audio_initialize_stream(audio_stream_t *stream, audio_stream_ops_t *stream_ops);
+int audio_register_stream(audio_stream_t *stream);
+
+#endif

kernel-src/include/kernel/devfs.h

@@ -12,16 +12,17 @@
 #define DEV_MAJOR_ZERO 3
 #define DEV_MAJOR_TTY 4
 #define DEV_MAJOR_FB 5
-#define DEV_MAJOR_KEYBOARD 6
+#define DEV_MAJOR_KEYBOARD 6 // unused, kept as to not reuse numbers
 #define DEV_MAJOR_BLOCK 7
 #define DEV_MAJOR_E9 8
 #define DEV_MAJOR_URANDOM 9
 #define DEV_MAJOR_NET 10
-#define DEV_MAJOR_MOUSE 11
+#define DEV_MAJOR_MOUSE 11 // unused, kept as to not reuse numbers
 #define DEV_MAJOR_PTY 12
 #define DEV_MAJOR_ACPI 13
 #define DEV_MAJOR_PROF 14
 #define DEV_MAJOR_INPUT 15
+#define DEV_MAJOR_AUDIO 16
 
 typedef struct {
 	int (*open)(int minor, vnode_t **vnode, int flags);

kernel-src/include/kernel/interrupt.h

@@ -15,6 +15,7 @@
 #define IPL_IGNORE  -1
 #define IPL_MAX 0
 #define IPL_TIMER 1
+#define IPL_AUDIO 300
 #define IPL_NET 400
 #define IPL_DISK 500
 #define IPL_SERIAL 550

kernel-src/include/kernel/vfs.h

@@ -119,6 +119,7 @@ typedef struct advlock_t {
 #define V_FFLAGS_EXEC 16
 #define V_FFLAGS_NOCTTY 32
 #define V_FFLAGS_NOCACHE 64
+#define V_FFLAGS_CLOSE_URGENT 128
 
 typedef struct vnode_t {
 	struct vops_t *ops;