Mon, 06 Dec 2010 01:43:04 +0000
fix side-select bug in WDC FDC driver, was causing all reads to occur on side0... now the Loader boots!
Loader will boot, but immediately gives up on the floppy drive... Not sure why.
1 #ifndef _STATE_H
2 #define _STATE_H
4 #include <stddef.h>
5 #include <stdint.h>
6 #include <stdbool.h>
7 #include "wd279x.h"
9 // Maximum size of the Boot PROMs. Must be a binary power of two.
10 #define ROM_SIZE 32768
12 /**
13 * @brief Emulator state storage
14 *
15 * This structure stores the internal state of the emulator.
16 */
17 typedef struct {
18 // Boot PROM can be up to 32Kbytes total size
19 uint8_t rom[ROM_SIZE]; ///< Boot PROM data buffer
21 //// Main system RAM
22 uint8_t *ram; ///< RAM data buffer
23 size_t ram_size; ///< Size of RAM buffer in bytes
25 /// Video RAM
26 uint8_t vram[0x8000];
28 /// Map RAM
29 uint8_t map[0x800];
31 //// Registers
32 uint16_t genstat; ///< General Status Register
33 uint16_t bsr0; ///< Bus Status Register 0
34 uint16_t bsr1; ///< Bus Status Register 1
36 //// MISCELLANEOUS CONTROL REGISTER
37 bool dma_reading; ///< True if Disc DMA reads from the controller, false otherwise
38 uint8_t leds; ///< LED status, 1=on, in order red3/green2/yellow1/red0 from bit3 to bit0
40 //// GENERAL CONTROL REGISTER
41 /// GENCON.ROMLMAP -- false ORs the address with 0x800000, forcing the
42 /// 68010 to access ROM instead of RAM when booting. TRM page 2-36.
43 bool romlmap;
44 /// GENCON.PIE -- Parity Error Check Enable
45 bool pie;
47 /// DMA Address Register
48 uint32_t dma_address;
50 /// DMA count
51 uint32_t dma_count;
53 /// DMA direction
54 bool idmarw;
55 /// DMA enable
56 bool dmaen;
57 bool dmaenb;
59 /// Floppy disc controller context
60 WD2797_CTX fdc_ctx;
61 } S_state;
63 // Global emulator state. Yes, I know global variables are evil, please don't
64 // email me and lecture me about it. -philpem
65 #ifndef _STATE_C
66 extern S_state state;
67 #else
68 S_state state;
69 #endif
71 /**
72 * @brief Initialise system state
73 *
74 * @param ramsize RAM size in bytes -- must be a multiple of 512KiB, min 512KiB, max 4MiB.
75 *
76 * Initialises the emulator's internal state.
77 */
78 int state_init(size_t ramsize);
80 /**
81 * @brief Deinitialise system state
82 *
83 * Deinitialises the saved state, and frees all memory. Call this function
84 * before exiting your program to avoid memory leaks.
85 */
86 void state_done();
88 #endif