view memmap.h @ 1925:039553703c20

Don't apply address and cd register changes to the 'live' registers until pending flag is cleared, but do preserve the upper address bits in the latch. Fixes regression in Overdrive 2 while preserving fix to Mona in 344 bytes
author Michael Pavone <pavone@retrodev.com>
date Mon, 13 Apr 2020 20:43:25 -0700
parents 360d5bab199f
children 9caebcfeac72
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#ifndef MEMMAP_H_
#define MEMMAP_H_

typedef enum {
	READ_16,
	READ_8,
	WRITE_16,
	WRITE_8
} ftype;

#define MMAP_READ      0x01
#define MMAP_WRITE     0x02
#define MMAP_CODE      0x04
#define MMAP_PTR_IDX   0x08
#define MMAP_ONLY_ODD  0x10
#define MMAP_ONLY_EVEN 0x20
#define MMAP_FUNC_NULL 0x40
#define MMAP_BYTESWAP  0x80
#define MMAP_AUX_BUFF  0x100
#define MMAP_READ_CODE 0x200

typedef uint16_t (*read_16_fun)(uint32_t address, void * context);
typedef uint8_t (*read_8_fun)(uint32_t address, void * context);
typedef void * (*write_16_fun)(uint32_t address, void * context, uint16_t value);
typedef void * (*write_8_fun)(uint32_t address, void * context, uint8_t value);

typedef struct {
	uint32_t     start;
	uint32_t     end;
	uint32_t     mask;
	uint32_t     aux_mask;
	uint16_t     ptr_index;
	uint16_t     flags;
	void *       buffer;
	read_16_fun  read_16;
	write_16_fun write_16;
	read_8_fun   read_8;
	write_8_fun  write_8;
} memmap_chunk;

#endif //MEMMAP_H_