Tue, 15 Jan 2013 17:02:56 +0000
Implement m68k_read_disassembler_* properly
The previous implementations of m68k_read_disassembler are unsuitable due to
interactions with the memory mapper. A read from memory by the DASM should not
mutate system state.
So we modify the m68k_read_disassembler_{8,16,32} functions to do the memory
mapping themselves without causing page faults (bus error exception) or
updating the page flag bits (which could really upset the kernel).
Now all we need is a debugger/disassembler...
| philpem@86 | 1 | #ifndef _KEYBOARD_H |
| philpem@86 | 2 | #define _KEYBOARD_H |
| philpem@86 | 3 | |
| philpem@80 | 4 | #include "SDL.h" |
| philpem@86 | 5 | |
| philpem@80 | 6 | /// Keyboard buffer size in bytes |
| philpem@80 | 7 | #define KEYBOARD_BUFFER_SIZE 256 |
| philpem@80 | 8 | |
| philpem@86 | 9 | typedef struct { |
| philpem@80 | 10 | /// Key states |
| philpem@80 | 11 | int keystate[0x80]; |
| philpem@80 | 12 | |
| philpem@80 | 13 | /// Keyboard buffer |
| philpem@90 | 14 | uint8_t buffer[KEYBOARD_BUFFER_SIZE]; |
| philpem@80 | 15 | |
| philpem@80 | 16 | /// Read pointer |
| philpem@80 | 17 | size_t readp; |
| philpem@80 | 18 | |
| philpem@80 | 19 | /// Write pointer |
| philpem@80 | 20 | size_t writep; |
| philpem@80 | 21 | |
| philpem@80 | 22 | /// Number of bytes in keyboard buffer |
| philpem@80 | 23 | size_t buflen; |
| philpem@80 | 24 | |
| philpem@80 | 25 | /// Transmit Interrupt Enable |
| philpem@80 | 26 | bool txie; |
| philpem@90 | 27 | |
| philpem@80 | 28 | /// Receive Interrupt Enable |
| philpem@80 | 29 | bool rxie; |
| philpem@91 | 30 | |
| philpem@91 | 31 | /// "Keyboard State Changed" flag |
| philpem@91 | 32 | bool update_flag; |
| philpem@86 | 33 | } KEYBOARD_STATE; |
| philpem@86 | 34 | |
| philpem@86 | 35 | /** |
| philpem@80 | 36 | * Initialise a keyboard state block. |
| philpem@86 | 37 | * |
| philpem@80 | 38 | * Call this once when the keyboard is added to the emulation. |
| philpem@86 | 39 | */ |
| philpem@80 | 40 | void keyboard_init(KEYBOARD_STATE *ks); |
| philpem@86 | 41 | |
| philpem@86 | 42 | /** |
| philpem@80 | 43 | * SDL_Event delegation routine. |
| philpem@86 | 44 | * |
| philpem@80 | 45 | * Call this when an SDL keyup or keydown event is received. |
| philpem@86 | 46 | */ |
| philpem@80 | 47 | void keyboard_event(KEYBOARD_STATE *ks, SDL_Event *ev); |
| philpem@80 | 48 | |
| philpem@80 | 49 | /** |
| philpem@80 | 50 | * Keyboard scan routine. |
| philpem@80 | 51 | * |
| philpem@80 | 52 | * Call this periodically to scan the keyboard. 60 times/sec should be fine. |
| philpem@80 | 53 | */ |
| philpem@80 | 54 | void keyboard_scan(KEYBOARD_STATE *ks); |
| philpem@80 | 55 | |
| philpem@80 | 56 | bool keyboard_get_irq(KEYBOARD_STATE *ks); |
| philpem@80 | 57 | uint8_t keyboard_read(KEYBOARD_STATE *ks, uint8_t addr); |
| philpem@80 | 58 | void keyboard_write(KEYBOARD_STATE *ks, uint8_t addr, uint8_t val); |
| philpem@86 | 59 | |
| philpem@86 | 60 | #endif |