// devices.h
// Device subsystem for HOS
// Author: Josh Holtrop
// Date: 05/11/05
// Modified: 06/02/05

#ifndef __HOS_DEVICES_H__
#define __HOS_DEVICES_H__ __HOS_DEVICES_H__

#include "hos_defines.h"

#define DEV_INVALID_ACCESS -256
#define DEV_INVALID_DEVICE -257
#define DEV_EOF -1

#define MAJOR_MISC_CHAR	1
#define MAJOR_RAMDISK 2
#define MAJOR_VCONSOLE	4

#define BLOCK_SIZE 512
#define BLOCK_SIZE_LOG 9

#define	DEV_MAJOR(x) (((x) >> 8) & 0xFF)
#define DEV_MINOR(x) ((x) & 0xFF)
#define DEV(x,y) ((x) << 8 | (y))

typedef short major_t;
typedef short minor_t;
typedef u32_t device_t;

#ifdef _HOS_CPP_
extern "C" {
#endif

int	devices_init();
int	block_read(major_t major, minor_t minor, u32_t blockStart, u32_t blocks, void *buffer);
int	block_write(major_t major, minor_t minor, u32_t blockStart, u32_t blocks, void *buffer);
int	char_read(major_t major, minor_t minor);
int	char_write(major_t major, minor_t minor, int c);

#ifdef _HOS_CPP_
}

class DeviceDriver
{
public:
	DeviceDriver();
	virtual ~DeviceDriver();
	virtual int char_read(minor_t minor);
	virtual int char_write(minor_t minor, int c);
	virtual int block_read(minor_t minor, u32_t blockStart, u32_t blocks, void *buffer);
	virtual int block_write(minor_t minor, u32_t blockStart, u32_t blocks, void *buffer);
};

#endif

#endif