Wed, 01 Dec 2010 22:34:15 +0000
move repeated R/W bit-shifting stuff into macros and fix RAM addressing issue
1 #ifndef _STATE_H
2 #define _STATE_H
4 #include <stddef.h>
5 #include <stdint.h>
6 #include <stdbool.h>
8 // Maximum size of the Boot PROMs. Must be a binary power of two.
9 #define ROM_SIZE 32768
11 /**
12 * @brief Emulator state storage
13 *
14 * This structure stores the internal state of the emulator.
15 */
16 typedef struct {
17 // Boot PROM can be up to 32Kbytes total size
18 uint8_t rom[ROM_SIZE]; ///< Boot PROM data buffer
20 // Main system RAM
21 uint8_t *ram; ///< RAM data buffer
22 size_t ram_size; ///< Size of RAM buffer in bytes
24 // Video RAM
25 uint8_t vram[0x8000]; ///< Video RAM
27 // Map RAM
28 uint8_t map[0x800]; ///< Map RAM
30 // GENERAL CONTROL REGISTER
31 /// GENCON.ROMLMAP -- false ORs the address with 0x800000, forcing the
32 /// 68010 to access ROM instead of RAM when booting. TRM page 2-36.
33 bool romlmap;
34 } S_state;
36 // Global emulator state. Yes, I know global variables are evil, please don't
37 // email me and lecture me about it. -philpem
38 #ifndef _STATE_C
39 extern S_state state;
40 #else
41 S_state state;
42 #endif
44 /**
45 * @brief Initialise system state
46 *
47 * @param ramsize RAM size in bytes -- must be a multiple of 512KiB, min 512KiB, max 4MiB.
48 *
49 * Initialises the emulator's internal state.
50 */
51 int state_init(size_t ramsize);
53 /**
54 * @brief Deinitialise system state
55 *
56 * Deinitialises the saved state, and frees all memory. Call this function
57 * before exiting your program to avoid memory leaks.
58 */
59 void state_done();
61 #endif