Thu, 08 Dec 2011 23:44:19 +0000
[musashi] fix stackframe type for bus errors
Bus errors incorrectly pushed a Type 0000 stackframe, when they should have pushed a Type 1000 (Type $8) stackframe.
Also, type 1000 frames were not handled for 68010 CPUs. They are now, but code must later be added to handle them for 68020s. FIXME!
Reported-By: Armin Diehl <ad ardiehl.de>
1 #ifndef _WD279X_H
2 #define _WD279X_H
4 #include <stdbool.h>
5 #include <stddef.h>
6 #include <stdint.h>
7 #include <stdio.h>
9 /// WD279x registers
10 typedef enum {
11 WD2797_REG_STATUS = 0, ///< Status register
12 WD2797_REG_COMMAND = 0, ///< Command register
13 WD2797_REG_TRACK = 1, ///< Track register
14 WD2797_REG_SECTOR = 2, ///< Sector register
15 WD2797_REG_DATA = 3 ///< Data register
16 } WD2797_REG;
18 /// WD279x emulator error codes
19 typedef enum {
20 WD2797_ERR_OK = 0, ///< Operation succeeded
21 WD2797_ERR_BAD_GEOM = -1, ///< Bad geometry, or image file too small
22 WD2797_ERR_NO_MEMORY = -2 ///< Out of memory
23 } WD2797_ERR;
25 typedef struct {
26 // Current track, head and sector
27 int track, head, sector;
28 // Geometry of current disc
29 int geom_secsz, geom_spt, geom_heads, geom_tracks;
30 // IRQ status
31 bool irq;
32 // Status of last command
33 uint8_t status;
34 // Last command uses DRQ bit?
35 bool cmd_has_drq;
36 // The last value written to the data register
37 uint8_t data_reg;
38 // Last step direction. -1 for "towards zero", 1 for "away from zero"
39 int last_step_dir;
40 // Data buffer, current DRQ pointer and length
41 uint8_t *data;
42 size_t data_pos, data_len;
43 // Current disc image file
44 FILE *disc_image;
45 } WD2797_CTX;
47 /**
48 * @brief Initialise a WD2797 context.
49 * @param ctx WD2797 context.
50 *
51 * This must be run once when the context is created.
52 */
53 void wd2797_init(WD2797_CTX *ctx);
55 /**
56 * @brief Reset a WD2797 context.
57 * @param ctx WD2797 context.
58 *
59 * This should be run if the WD2797 needs to be reset (nRST line toggled).
60 */
61 void wd2797_reset(WD2797_CTX *ctx);
63 /**
64 * Deinitialise a WD2797 context.
65 * @param ctx WD2797 context.
66 */
67 void wd2797_done(WD2797_CTX *ctx);
69 /**
70 * @brief Read IRQ Rising Edge status. Clears Rising Edge status if it is set.
71 * @note No more IRQs will be sent until the Status Register is read, or a new command is written to the CR.
72 * @param ctx WD2797 context.
73 */
74 bool wd2797_get_irq(WD2797_CTX *ctx);
76 /**
77 * @brief Read DRQ status.
78 * @param ctx WD2797 context.
79 */
80 bool wd2797_get_drq(WD2797_CTX *ctx);
82 /**
83 * @brief Assign a disc image to the WD2797.
84 * @param ctx WD2797 context.
85 * @param fp Disc image file, already opened in "r+b" mode.
86 * @param secsz Sector size: either 128, 256, 512 or 1024.
87 * @param spt Sectors per track.
88 * @param heads Number of heads (1 or 2).
89 * @return Error code; WD279X_E_OK if everything worked OK.
90 */
91 WD2797_ERR wd2797_load(WD2797_CTX *ctx, FILE *fp, int secsz, int spt, int heads);
93 /**
94 * @brief Deassign the current image file.
95 * @param ctx WD2797 context.
96 */
97 void wd2797_unload(WD2797_CTX *ctx);
99 /**
100 * @brief Read WD279x register.
101 * @param ctx WD2797 context
102 * @param addr Register address (0, 1, 2 or 3)
103 */
104 uint8_t wd2797_read_reg(WD2797_CTX *ctx, uint8_t addr);
106 /**
107 * @brief Write WD279X register
108 * @param ctx WD2797 context
109 * @param addr Register address (0, 1, 2 or 3)
110 * @param val Value to write
111 */
112 void wd2797_write_reg(WD2797_CTX *ctx, uint8_t addr, uint8_t val);
115 #endif