#ifndef C64_REU_H
#define C64_REU_H

#include "types.h"

#define REU_STAT_IRQ		0x80
#define REU_STAT_EOB		0x40
#define REU_STAT_FAULT		0x20
#define REU_STAT_SIZE		0x10
#define REU_STAT_VERSION	0x0f

#define REU_CTRL_FIXL		0x80
#define REU_CTRL_FIXR		0x40
#define REU_CTRL_INCL		0x00
#define REU_CTRL_INCR		0x00

#define REU_IRQ_ENABLE		0x80
#define REU_IRQ_EOB			0x40
#define REU_IRQ_FAULT		0x20

#define REU_CMD_EXEC		0x80
#define REU_CMD_AUTO		0x20
#define REU_CMD_FF00		0x10
#define REU_CMD_STORE		0x00
#define REU_CMD_LOAD		0x01
#define REU_CMD_SWAP		0x02
#define REU_CMD_VERIFY		0x03

struct REU
{
	volatile byte	status;
	volatile byte	cmd;

	volatile word	laddr;
	volatile word	raddr;
	volatile byte	rbank;

	volatile word	length;

	volatile byte	irqmask;
	volatile byte	ctrl;
};


#define reu 	(*((struct REU *)0xdf00))

// Count the number of 64k pages in the REU, the test is destructive
int reu_count_pages(void);

// Copy an array of data from C64 memory to the REU memory
inline void reu_store(unsigned long raddr, const volatile char * sp, unsigned length);

// Copy an array of data from REU memory to the C64 memory
inline void reu_load(unsigned long raddr, volatile char * dp, unsigned length);

// Fill an array of data in the REU with a single value
inline void reu_fill(unsigned long raddr, char c, unsigned length);

// Copy a 2D array from REU memory to the C64 memory.  The stride parameter 
// is the distance of two rows in REU memory
inline void reu_load2d(unsigned long raddr, volatile char * dp, char height, unsigned width, unsigned stride);


inline void reu_load2dpage(unsigned long raddr, volatile char * dp, char height, unsigned width, unsigned stride);

#pragma compile("reu.c")

#endif