Thu, 02 Dec 2010 20:58:12 +0000
rework address-check logic
| philpem@18 | 1 | #ifndef _STATE_H |
| philpem@18 | 2 | #define _STATE_H |
| philpem@18 | 3 | |
| philpem@18 | 4 | #include <stddef.h> |
| philpem@18 | 5 | #include <stdint.h> |
| philpem@18 | 6 | #include <stdbool.h> |
| philpem@18 | 7 | |
| philpem@18 | 8 | // Maximum size of the Boot PROMs. Must be a binary power of two. |
| philpem@18 | 9 | #define ROM_SIZE 32768 |
| philpem@18 | 10 | |
| philpem@18 | 11 | /** |
| philpem@18 | 12 | * @brief Emulator state storage |
| philpem@18 | 13 | * |
| philpem@18 | 14 | * This structure stores the internal state of the emulator. |
| philpem@18 | 15 | */ |
| philpem@18 | 16 | typedef struct { |
| philpem@18 | 17 | // Boot PROM can be up to 32Kbytes total size |
| philpem@18 | 18 | uint8_t rom[ROM_SIZE]; ///< Boot PROM data buffer |
| philpem@18 | 19 | |
| philpem@18 | 20 | // Main system RAM |
| philpem@18 | 21 | uint8_t *ram; ///< RAM data buffer |
| philpem@18 | 22 | size_t ram_size; ///< Size of RAM buffer in bytes |
| philpem@18 | 23 | |
| philpem@24 | 24 | // Video RAM |
| philpem@24 | 25 | uint8_t vram[0x8000]; ///< Video RAM |
| philpem@24 | 26 | |
| philpem@26 | 27 | // Map RAM |
| philpem@26 | 28 | uint8_t map[0x800]; ///< Map RAM |
| philpem@26 | 29 | |
| philpem@37 | 30 | // Registers |
| philpem@37 | 31 | uint16_t genstat; ///< General Status Register |
| philpem@37 | 32 | uint16_t bsr0; ///< Bus Status Register 0 |
| philpem@37 | 33 | uint16_t bsr1; ///< Bus Status Register 1 |
| philpem@32 | 34 | |
| philpem@18 | 35 | // GENERAL CONTROL REGISTER |
| philpem@18 | 36 | /// GENCON.ROMLMAP -- false ORs the address with 0x800000, forcing the |
| philpem@18 | 37 | /// 68010 to access ROM instead of RAM when booting. TRM page 2-36. |
| philpem@24 | 38 | bool romlmap; |
| philpem@18 | 39 | } S_state; |
| philpem@18 | 40 | |
| philpem@18 | 41 | // Global emulator state. Yes, I know global variables are evil, please don't |
| philpem@18 | 42 | // email me and lecture me about it. -philpem |
| philpem@18 | 43 | #ifndef _STATE_C |
| philpem@18 | 44 | extern S_state state; |
| philpem@18 | 45 | #else |
| philpem@18 | 46 | S_state state; |
| philpem@18 | 47 | #endif |
| philpem@18 | 48 | |
| philpem@18 | 49 | /** |
| philpem@18 | 50 | * @brief Initialise system state |
| philpem@18 | 51 | * |
| philpem@18 | 52 | * @param ramsize RAM size in bytes -- must be a multiple of 512KiB, min 512KiB, max 4MiB. |
| philpem@18 | 53 | * |
| philpem@18 | 54 | * Initialises the emulator's internal state. |
| philpem@18 | 55 | */ |
| philpem@18 | 56 | int state_init(size_t ramsize); |
| philpem@18 | 57 | |
| philpem@18 | 58 | /** |
| philpem@18 | 59 | * @brief Deinitialise system state |
| philpem@18 | 60 | * |
| philpem@18 | 61 | * Deinitialises the saved state, and frees all memory. Call this function |
| philpem@18 | 62 | * before exiting your program to avoid memory leaks. |
| philpem@18 | 63 | */ |
| philpem@18 | 64 | void state_done(); |
| philpem@18 | 65 | |
| philpem@18 | 66 | #endif |