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84b74595 AT |
1 | /* (c) 2021 Aaron Taylor <ataylor at subgeniuskitty dot com> */ |
2 | /* See LICENSE.txt file for copyright and license details. */ | |
3 | ||
84b74595 | 4 | #include <stdbool.h> |
84b74595 AT |
5 | #include "./a.out.h" |
6 | ||
84b74595 AT |
7 | /* Bytes per word. */ |
8 | #define BPW 4 | |
9 | ||
6d0028fd AT |
10 | /* Syllables per word. */ |
11 | #define SPW 5 | |
84b74595 | 12 | |
6d0028fd AT |
13 | /* Storage definitions. */ |
14 | #define STACK_LENGTH 65536 | |
15 | #define RAM_LENGTH 67108864 | |
d87b1e06 | 16 | #define RAM_BASE_ADDRESS 0x20000000 |
84b74595 | 17 | |
84b74595 AT |
18 | struct NEDpsw { |
19 | bool zero; | |
20 | bool negative; | |
21 | }; | |
22 | ||
23 | struct NEDthread { | |
24 | uint32_t stack[STACK_LENGTH]; | |
25 | uint32_t sp; | |
26 | uint32_t pc; | |
27 | uint8_t sc; | |
28 | struct NEDpsw * psw; | |
29 | }; | |
30 | ||
31 | struct NEDhack { | |
32 | uint32_t iw; | |
33 | bool resume_word; | |
34 | }; | |
35 | ||
84b74595 AT |
36 | struct NEDstate { |
37 | bool halted; | |
38 | uint8_t ram[RAM_LENGTH]; | |
d87b1e06 AT |
39 | /* Although NED is multi-threaded, this screensaver is restricted to a single thread. */ |
40 | struct NEDthread * thread[1]; | |
84b74595 AT |
41 | struct NEDthread * active_thread; |
42 | struct NEDhack * hack; | |
43 | }; | |
44 | ||
45 | enum syllables { | |
46 | MVSTCK = 0b00001111, | |
47 | JMP = 0b00001110, | |
48 | SWAP = 0b00001101, | |
49 | ADD = 0b00001100, | |
50 | XOR = 0b00001011, | |
51 | NOT = 0b00001010, | |
52 | OR = 0b00001001, | |
53 | AND = 0b00001000, | |
54 | BRZ = 0b00000111, | |
55 | TEST = 0b00000110, | |
56 | CMPSWP = 0b00000101, | |
57 | SHIFT = 0b00000100, | |
58 | STORE = 0b00000011, | |
59 | LOAD = 0b00000010, | |
60 | NOP = 0b00000001, | |
61 | HALT = 0b00000000 | |
62 | }; | |
63 | ||
5923644e | 64 | struct NEDstate * init_simulator(char * input_file); |
84b74595 AT |
65 | struct NEDstate * run_simulator(struct NEDstate * state); |
66 | uint32_t ram_r_word(struct NEDstate * state, uint32_t address); | |
67 |