/** \file
 * DryOS structures and functions.
 *
 * These are reverse engineered from the 5D Mark 2 firmware
 * version 1.0.7.
 *
 * \note Do not forget to update the stubs-5d2.107.S file with
 * new functions as they are added here!
 */
#ifndef _dryos_h_
#define _dryos_h_

#include "arm-mcr.h"

typedef void (*thunk)(void);


/** Panic and abort the camera */
extern void __attribute__((noreturn))
DryosPanic(
	uint32_t		arg0,
	uint32_t		arg1
);

extern void
DebugMsg(
	int			subsys,
	int			level,
	const char *		fmt,
	...
);


struct context
{
	uint32_t		cpsr;
	uint32_t		r[13];
	uint32_t		lr;
	uint32_t		pc;
};

struct task
{
	uint32_t		off_0x00;	// always 0?
	uint32_t		off_0x04;	// stack maybe?
	uint32_t		off_0x08;	// flags?
	void *			entry;		// off 0x0c
	uint32_t		off_0x10;
	uint32_t		off_0x14;
	uint32_t		off_0x18;
	uint32_t		off_0x1c;
	uint32_t		off_0x20;
	char *			name;		// off_0x24;
	uint32_t		off_0x28;
	uint32_t		off_0x2c;
	uint32_t		off_0x30;
	uint32_t		off_0x34;
	uint32_t		off_0x38;
	uint32_t		off_0x3c;
	uint32_t		off_0x40;
	uint32_t		off_0x44;
	uint32_t		off_0x48;
	struct context *	context;	// off 0x4C
	uint32_t		pad_1[12];
};


/*
 * Audio information structure at 0x7324.
 * This controls the AGC system.
 */
struct audio_info
{
	uint8_t			off_0x00;
	uint8_t			off_0x01;
	uint8_t			off_0x02;
	uint8_t			off_0x03;
	struct semaphore *	sem_interval;	// off_0x04
	uint32_t		task_created;	// off_0x08
	uint32_t		asif_started;	// off_0x0c
	uint32_t		initialized;	// off_0x10
	struct semaphore *	sem_task;	// off_0x14
	uint32_t		off_0x18;
	int32_t			sample_count;	// off_0x1c
	int32_t			gain;		// off_0x20, from 0 to -41
	uint32_t		max_sample;	// off_0x24
} __attribute__((packed));

extern struct audio_info * audio_info;


/**
 * Sound device structure.
 */
struct sound_dev
{
	uint8_t pad0[ 0x70 ];
	struct semaphore *	sem;	 // off 0x70
};

extern struct sound_dev * sound_dev;


/** Return the head of the running task list */
extern struct task *
get_current_task(void);


/** Put the current task to sleep for msec miliseconds */
extern void
msleep(
	int			msec
);

//CANON_FUNC( 0xFF81612C, void, sched_yield, ( void ) );
//CANON_FUNC( 0xFF816904, void, sched_yield, ( void ) );
//CANON_FUNC( 0xFF81601C, void, sched_yield, ( void ) );

/** Maybe give up the CPU; use msleep() instead */
extern void
sched_yield(
	uint32_t		must_be_zero
);


/** Official initial task.
 * \note Overridden by reboot shim.
 * \internal
 */
extern void
init_task( void );

/** Official routine to create the init task.
 * \internal
 */
extern void
create_init_task( void );

/** unknown */
extern int
task_save_state( void * buf );


extern int
RegisterEventProcedure_im1(
	const char *		name,
	void 			(*handler)( void )
);

extern int
UnregisterEventProcedure(
	const char *		name
);


extern void
EP_SetMovieManualExposureMode(
	uint32_t *		enable_ptr
);

extern void
EP_SetDebugLogMode(
	uint32_t *		enable_ptr
);

extern void
EP_SetLVAEDebugPort(
	uint32_t *		enable_ptr
);

extern void *
new_task_struct( int );


/** Create a new user level task.
 *
 * The arguments are not really known yet.
 */
extern void
create_task(
	const char * name,
	uint32_t priority,
	uint32_t unknown0,
	void * entry,
	void * unknown1
);


/** Bootstrap a new task.
 * \internal
 * \note This is never directly called by the user; it is the entry
 * point used by create_task() to call the user task and then to pass
 * the return code to what ever cleans up after the task exits.
 */
extern void
task_trampoline(
	struct task *		task
);


struct semaphore;

extern struct semaphore *
create_named_semaphore(
	const char *		name,
	int			initial_value
);

extern int
take_semaphore(
	struct semaphore *	semaphore,
	int			timeout_interval
);

extern int
give_semaphore(
	struct semaphore *	semaphore
);


extern int
oneshot_timer(
	uint32_t		msec,
	void			(*handler_if_expired)(void*),
	void			(*handler)(void*),
	void *			arg
);


extern void audio_set_alc_on(void);
extern void audio_set_alc_off(void);
extern void audio_set_filter_off(void);
extern void audio_set_windcut(int);
extern void audio_set_sampling_param(int, int, int);
extern void audio_set_volume_in(int,int);
extern void audio_start_asif_observer(void);
extern void audio_level_task(void);
extern void audio_interval_unlock(void*);


/** Official Canon sound device task.
 * \internal
 */
extern void sound_dev_task(void);

/** \name File I/O flags.
 *
 * \note I don't know how many of these are supported
 * @{
 */
#define O_RDONLY             00
#define O_WRONLY             01
#define O_RDWR               02
#define O_CREAT            0100 /* not fcntl */
#define O_EXCL             0200 /* not fcntl */
#define O_NOCTTY           0400 /* not fcntl */
#define O_TRUNC           01000 /* not fcntl */
#define O_APPEND          02000
#define O_NONBLOCK        04000
#define O_NDELAY        O_NONBLOCK
#define O_SYNC           010000
#define O_FSYNC          O_SYNC
#define O_ASYNC          020000
/* @} */


extern int
open(
	const char *		name,
	int			flags,
	int			mode
);

extern void
close(
	int			fd
);

#define INVALID_PTR		((const void *)0xFFFFFFFF)

extern void *
FIO_CreateFile(
	const char *		name
);


extern int
FIO_WriteFile(
	void *			file,
	const void *		buf,
	uint32_t		len_in_bytes
);


extern void
FIO_CloseFile(
	void *			file
);

extern void
FIO_CloseSync(
	void *			file
);


extern void
write_debug_file(
	const char *		name,
	const void *		buf,
	size_t			len
);


extern void
bzero32(
	void *			buf,
	size_t			len
);



/** Firmware entry points */
extern void firmware_entry(void);
extern void reloc_entry(void);
extern void __attribute__((noreturn)) cstart(void);


/** Dialog box gui elements */
struct dialog;

/** Returns 0 if it handled the message, 1 if it did not? */
typedef int (*dialog_handler_t)(
	int			self_id,
	void *			arg,
	uint32_t		event
);

extern int
dialog_create(
	int			id,
	int			level_maybe,
	dialog_handler_t	handler,
	void *			arg1,
	void *			arg2
);

extern void
dialog_draw(
	int			dialog_id
);


extern void
color_palette_push(
	int			palette_id
);


/** Movie recording.
 *
 * State information is in this structure.  A pointer to the global
 * object is at 0x1ee0.  It is of size 0x1b4.
 *
 * The state object is in 0x68a4.
 */
struct mvr_struct
{
	const char *		type;	 // "MovieRecorder"
};

extern struct mvr_struct ** mvr_struct;
extern struct state_object ** mvr_state;

/** State objects.
 *
 * Not much is known about how these work.  They have a list
 * of function pointers and perhaps work like FSM?
 *
 * Size 0x20
 */
typedef struct state_object * (*state_function_t)(
	void *			arg1,
	void *			arg2,
	void *			arg3
);

struct state_callback
{
	uint32_t		next_state;
	state_function_t	handler;
};


struct state_object
{
	const char *		type;		// off 0x00, "StateObject" 
	const char *		name;		// off 0x04, arg 0
	uint32_t		auto_sequence;	// off 0x08, arg 1

	// off 0x0c, always 0xff99a228 ?
	void			(*callback)(
		struct state_object *	self,
		void *			arg1,
		uint32_t		input,
		void *			arg3,
		void *			arg4
	);

	// Points to an array of size [max_inputs][max_states]
	struct state_callback *	callbacks;	// off 0x10
	uint32_t		max_inputs;	// off 0x14, arg 2
	uint32_t		max_states;	// off 0x18, arg 3
	uint32_t		state;		// off 0x1c, initially 0
};


extern struct state_object *
state_object_create(
	const char *		name,
	int			auto_sequence,
	state_function_t *	callbacks,
	int			max_inputs,
	int			max_states
);



/** VRAM accessors */
extern uint32_t
vram_get_number(
	uint32_t		number
);

/** Write the VRAM to a BMP file named "A:/test.bmp" */
extern void
dispcheck( void );


/** Main menu tab functions */
extern int main_tab_dialog_id;
extern void main_tab_header_dialog( void );
extern void StopMnMainTabHeaderApp( void );
extern void StartMnMainRec1App( void );
extern void StartMnMainRec2App( void );
extern void StartMnMainPlay1App( void );
extern void StartMnMainPlay2App( void );
extern void StartMnMainSetup1App( void );
extern void StartMnMainSetup2App( void );
extern void StartMnMainSetup3App( void );
extern void StartMnMainCustomFuncApp( void );
extern void StartMnMainMyMenuApp( void );


/** Hidden menus */
extern void StartFactoryMenuApp( void );
extern void StartMnStudioSetupMenuApp( void );


#endif