src/state.h

Wed, 16 Jan 2013 00:41:51 +0000

author
Philip Pemberton <philpem@philpem.me.uk>
date
Wed, 16 Jan 2013 00:41:51 +0000
changeset 127
4c03f6433d0d
parent 112
a392eb8f9806
child 142
cfa30b1cd92f
child 151
b63a3999e2e7
permissions
-rw-r--r--

fix default HDD sectors-per-track

The 64MB Micropolis drive we're trying to emulate in FreeBee has 17 sectors
per track. Fix this in main.c to avoid tripping the sector range checks.

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@112 8 #include "wd2010.h"
philpem@80 9 #include "keyboard.h"
philpem@18 10
philpem@18 11 // Maximum size of the Boot PROMs. Must be a binary power of two.
philpem@18 12 #define ROM_SIZE 32768
philpem@18 13
philpem@18 14 /**
philpem@55 15 * State error codes
philpem@55 16 */
philpem@55 17 typedef enum {
philpem@55 18 STATE_E_OK = 0, ///< Operation succeeded
philpem@55 19 STATE_E_BAD_RAMSIZE = -1, ///< Bad RAM size specified (not a multiple of 512K, or less than 512K)
philpem@55 20 STATE_E_NO_MEMORY = -2, ///< Out of memory while allocating state variables
philpem@55 21 STATE_E_ROM_LOAD_FAIL = -3 ///< Error loading ROMs
philpem@55 22 } STATE_ERR;
philpem@55 23
philpem@55 24 /**
philpem@18 25 * @brief Emulator state storage
philpem@18 26 *
philpem@18 27 * This structure stores the internal state of the emulator.
philpem@18 28 */
philpem@18 29 typedef struct {
philpem@18 30 // Boot PROM can be up to 32Kbytes total size
philpem@18 31 uint8_t rom[ROM_SIZE]; ///< Boot PROM data buffer
philpem@18 32
philpem@52 33 //// Main system RAM
philpem@60 34 uint8_t *base_ram; ///< Base RAM data buffer
philpem@60 35 size_t base_ram_size; ///< Size of Base RAM buffer in bytes
philpem@62 36 uint8_t *exp_ram; ///< Expansion RAM data buffer
philpem@62 37 size_t exp_ram_size; ///< Size of Expansion RAM buffer in bytes
philpem@18 38
philpem@52 39 /// Video RAM
philpem@52 40 uint8_t vram[0x8000];
philpem@24 41
philpem@52 42 /// Map RAM
philpem@52 43 uint8_t map[0x800];
philpem@26 44
philpem@52 45 //// Registers
philpem@37 46 uint16_t genstat; ///< General Status Register
philpem@37 47 uint16_t bsr0; ///< Bus Status Register 0
philpem@37 48 uint16_t bsr1; ///< Bus Status Register 1
philpem@32 49
philpem@52 50 //// MISCELLANEOUS CONTROL REGISTER
philpem@52 51 bool dma_reading; ///< True if Disc DMA reads from the controller, false otherwise
philpem@46 52 uint8_t leds; ///< LED status, 1=on, in order red3/green2/yellow1/red0 from bit3 to bit0
philpem@46 53
philpem@97 54 bool timer_enabled;
philpem@97 55 bool timer_asserted;
philpem@97 56
philpem@52 57 //// GENERAL CONTROL REGISTER
philpem@18 58 /// GENCON.ROMLMAP -- false ORs the address with 0x800000, forcing the
philpem@18 59 /// 68010 to access ROM instead of RAM when booting. TRM page 2-36.
philpem@24 60 bool romlmap;
philpem@44 61 /// GENCON.PIE -- Parity Error Check Enable
philpem@44 62 bool pie;
philpem@101 63 /// GENCON.EE -- Error Enable
philpem@101 64 bool ee;
philpem@52 65
philpem@52 66 /// DMA Address Register
philpem@52 67 uint32_t dma_address;
philpem@52 68
philpem@53 69 /// DMA count
philpem@53 70 uint32_t dma_count;
philpem@53 71
philpem@53 72 /// DMA direction
philpem@53 73 bool idmarw;
philpem@53 74 /// DMA enable
philpem@53 75 bool dmaen;
philpem@53 76 bool dmaenb;
philpem@53 77
philpem@112 78 /// DMA device selection flags
philpem@112 79 bool fd_selected;
philpem@112 80 bool hd_selected;
philpem@52 81 /// Floppy disc controller context
philpem@52 82 WD2797_CTX fdc_ctx;
philpem@95 83 /// Current disc image file
philpem@95 84 FILE *fdc_disc;
philpem@80 85
philpem@112 86 /// Hard disc controller context
philpem@112 87 WD2010_CTX hdc_ctx;
philpem@112 88 FILE *hdc_disc0;
philpem@112 89 FILE *hdc_disc1;
philpem@112 90
philpem@80 91 /// Keyboard controller context
philpem@80 92 KEYBOARD_STATE kbd;
philpem@18 93 } S_state;
philpem@18 94
philpem@18 95 // Global emulator state. Yes, I know global variables are evil, please don't
philpem@18 96 // email me and lecture me about it. -philpem
philpem@18 97 #ifndef _STATE_C
philpem@18 98 extern S_state state;
philpem@18 99 #else
philpem@18 100 S_state state;
philpem@18 101 #endif
philpem@18 102
philpem@18 103 /**
philpem@18 104 * @brief Initialise system state
philpem@18 105 *
philpem@62 106 * @param base_ram_size Base RAM size in bytes -- must be a multiple of 512KiB, min 512KiB, max 2MiB.
philpem@62 107 * @param exp_ram_size Expansion RAM size in bytes -- must be a multiple of 512KiB, min 0, max 2MiB.
philpem@18 108 *
philpem@18 109 * Initialises the emulator's internal state.
philpem@18 110 */
philpem@62 111 int state_init(size_t base_ram_size, size_t exp_ram_size);
philpem@18 112
philpem@18 113 /**
philpem@18 114 * @brief Deinitialise system state
philpem@18 115 *
philpem@18 116 * Deinitialises the saved state, and frees all memory. Call this function
philpem@18 117 * before exiting your program to avoid memory leaks.
philpem@18 118 */
philpem@18 119 void state_done();
philpem@18 120
philpem@18 121 #endif