Tue, 28 Dec 2010 17:23:04 +0000
fixes to Base RAM addressing -- 512K detected OK now, still need to deal with Expansion RAM detect issues
| 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@52 | 7 | #include "wd279x.h" |
| philpem@18 | 8 | |
| philpem@18 | 9 | // Maximum size of the Boot PROMs. Must be a binary power of two. |
| philpem@18 | 10 | #define ROM_SIZE 32768 |
| philpem@18 | 11 | |
| philpem@18 | 12 | /** |
| philpem@55 | 13 | * State error codes |
| philpem@55 | 14 | */ |
| philpem@55 | 15 | typedef enum { |
| philpem@55 | 16 | STATE_E_OK = 0, ///< Operation succeeded |
| philpem@55 | 17 | STATE_E_BAD_RAMSIZE = -1, ///< Bad RAM size specified (not a multiple of 512K, or less than 512K) |
| philpem@55 | 18 | STATE_E_NO_MEMORY = -2, ///< Out of memory while allocating state variables |
| philpem@55 | 19 | STATE_E_ROM_LOAD_FAIL = -3 ///< Error loading ROMs |
| philpem@55 | 20 | } STATE_ERR; |
| philpem@55 | 21 | |
| philpem@55 | 22 | /** |
| philpem@18 | 23 | * @brief Emulator state storage |
| philpem@18 | 24 | * |
| philpem@18 | 25 | * This structure stores the internal state of the emulator. |
| philpem@18 | 26 | */ |
| philpem@18 | 27 | typedef struct { |
| philpem@18 | 28 | // Boot PROM can be up to 32Kbytes total size |
| philpem@18 | 29 | uint8_t rom[ROM_SIZE]; ///< Boot PROM data buffer |
| philpem@18 | 30 | |
| philpem@52 | 31 | //// Main system RAM |
| philpem@60 | 32 | uint8_t *base_ram; ///< Base RAM data buffer |
| philpem@60 | 33 | size_t base_ram_size; ///< Size of Base RAM buffer in bytes |
| philpem@18 | 34 | |
| philpem@52 | 35 | /// Video RAM |
| philpem@52 | 36 | uint8_t vram[0x8000]; |
| philpem@24 | 37 | |
| philpem@52 | 38 | /// Map RAM |
| philpem@52 | 39 | uint8_t map[0x800]; |
| philpem@26 | 40 | |
| philpem@52 | 41 | //// Registers |
| philpem@37 | 42 | uint16_t genstat; ///< General Status Register |
| philpem@37 | 43 | uint16_t bsr0; ///< Bus Status Register 0 |
| philpem@37 | 44 | uint16_t bsr1; ///< Bus Status Register 1 |
| philpem@32 | 45 | |
| philpem@52 | 46 | //// MISCELLANEOUS CONTROL REGISTER |
| philpem@52 | 47 | bool dma_reading; ///< True if Disc DMA reads from the controller, false otherwise |
| philpem@46 | 48 | uint8_t leds; ///< LED status, 1=on, in order red3/green2/yellow1/red0 from bit3 to bit0 |
| philpem@46 | 49 | |
| philpem@52 | 50 | //// GENERAL CONTROL REGISTER |
| philpem@18 | 51 | /// GENCON.ROMLMAP -- false ORs the address with 0x800000, forcing the |
| philpem@18 | 52 | /// 68010 to access ROM instead of RAM when booting. TRM page 2-36. |
| philpem@24 | 53 | bool romlmap; |
| philpem@44 | 54 | /// GENCON.PIE -- Parity Error Check Enable |
| philpem@44 | 55 | bool pie; |
| philpem@52 | 56 | |
| philpem@52 | 57 | /// DMA Address Register |
| philpem@52 | 58 | uint32_t dma_address; |
| philpem@52 | 59 | |
| philpem@53 | 60 | /// DMA count |
| philpem@53 | 61 | uint32_t dma_count; |
| philpem@53 | 62 | |
| philpem@53 | 63 | /// DMA direction |
| philpem@53 | 64 | bool idmarw; |
| philpem@53 | 65 | /// DMA enable |
| philpem@53 | 66 | bool dmaen; |
| philpem@53 | 67 | bool dmaenb; |
| philpem@53 | 68 | |
| philpem@52 | 69 | /// Floppy disc controller context |
| philpem@52 | 70 | WD2797_CTX fdc_ctx; |
| philpem@18 | 71 | } S_state; |
| philpem@18 | 72 | |
| philpem@18 | 73 | // Global emulator state. Yes, I know global variables are evil, please don't |
| philpem@18 | 74 | // email me and lecture me about it. -philpem |
| philpem@18 | 75 | #ifndef _STATE_C |
| philpem@18 | 76 | extern S_state state; |
| philpem@18 | 77 | #else |
| philpem@18 | 78 | S_state state; |
| philpem@18 | 79 | #endif |
| philpem@18 | 80 | |
| philpem@18 | 81 | /** |
| philpem@18 | 82 | * @brief Initialise system state |
| philpem@18 | 83 | * |
| philpem@18 | 84 | * @param ramsize RAM size in bytes -- must be a multiple of 512KiB, min 512KiB, max 4MiB. |
| philpem@18 | 85 | * |
| philpem@18 | 86 | * Initialises the emulator's internal state. |
| philpem@18 | 87 | */ |
| philpem@18 | 88 | int state_init(size_t ramsize); |
| philpem@18 | 89 | |
| philpem@18 | 90 | /** |
| philpem@18 | 91 | * @brief Deinitialise system state |
| philpem@18 | 92 | * |
| philpem@18 | 93 | * Deinitialises the saved state, and frees all memory. Call this function |
| philpem@18 | 94 | * before exiting your program to avoid memory leaks. |
| philpem@18 | 95 | */ |
| philpem@18 | 96 | void state_done(); |
| philpem@18 | 97 | |
| philpem@18 | 98 | #endif |