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annotate memmap.h @ 1987:71732f2f6f42

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Fix handling of unmapped reads/writes to the cart/expansion port region
author Mike Pavone <pavone@retrodev.com>
date Mon, 01 Jun 2020 23:59:59 -0700
parents 360d5bab199f
children 9caebcfeac72
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1 #ifndef MEMMAP_H_
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2 #define MEMMAP_H_
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3
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4 typedef enum {
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5 READ_16,
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6 READ_8,
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7 WRITE_16,
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8 WRITE_8
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9 } ftype;
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10
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11 #define MMAP_READ 0x01
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12 #define MMAP_WRITE 0x02
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13 #define MMAP_CODE 0x04
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14 #define MMAP_PTR_IDX 0x08
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15 #define MMAP_ONLY_ODD 0x10
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16 #define MMAP_ONLY_EVEN 0x20
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17 #define MMAP_FUNC_NULL 0x40
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18 #define MMAP_BYTESWAP 0x80
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19 #define MMAP_AUX_BUFF 0x100
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20 #define MMAP_READ_CODE 0x200
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21
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22 typedef uint16_t (*read_16_fun)(uint32_t address, void * context);
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23 typedef uint8_t (*read_8_fun)(uint32_t address, void * context);
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24 typedef void * (*write_16_fun)(uint32_t address, void * context, uint16_t value);
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25 typedef void * (*write_8_fun)(uint32_t address, void * context, uint8_t value);
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26
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27 typedef struct {
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28 uint32_t start;
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29 uint32_t end;
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30 uint32_t mask;
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31 uint32_t aux_mask;
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32 uint16_t ptr_index;
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33 uint16_t flags;
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34 void * buffer;
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35 read_16_fun read_16;
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36 write_16_fun write_16;
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37 read_8_fun read_8;
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38 write_8_fun write_8;
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39 } memmap_chunk;
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40
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41 #endif //MEMMAP_H_