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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 | ||
4 | // TODO: Prune includes in both this header and the corresponding source file. | |
5 | #include <stdio.h> | |
6 | #include <stdint.h> | |
7 | #include <inttypes.h> | |
8 | #include <stdlib.h> | |
9 | #include <stdbool.h> | |
10 | #include <unistd.h> | |
11 | #include <fcntl.h> | |
12 | #include <string.h> | |
13 | #include <errno.h> | |
14 | #include <time.h> | |
15 | #include <termios.h> | |
16 | #include <signal.h> | |
17 | #include <sys/socket.h> | |
18 | #include <sys/types.h> | |
19 | #include <netinet/in.h> | |
20 | #include <arpa/inet.h> | |
21 | #include <netdb.h> | |
22 | ||
23 | #include "./a.out.h" | |
24 | ||
84b74595 AT |
25 | /* Bytes per word. */ |
26 | #define BPW 4 | |
27 | ||
28 | /* Number of stack words. */ | |
d87b1e06 | 29 | #define STACK_LENGTH 65536 |
84b74595 AT |
30 | |
31 | /* Number of bytes of RAM. */ | |
d87b1e06 AT |
32 | #define RAM_LENGTH 67108864 |
33 | #define RAM_BASE_ADDRESS 0x20000000 | |
84b74595 AT |
34 | |
35 | /* Number of syllables per word. */ | |
36 | #define SPW 5 | |
37 | ||
38 | struct NEDpsw { | |
39 | bool zero; | |
40 | bool negative; | |
41 | }; | |
42 | ||
43 | struct NEDthread { | |
44 | uint32_t stack[STACK_LENGTH]; | |
45 | uint32_t sp; | |
46 | uint32_t pc; | |
47 | uint8_t sc; | |
48 | struct NEDpsw * psw; | |
49 | }; | |
50 | ||
51 | struct NEDhack { | |
52 | uint32_t iw; | |
53 | bool resume_word; | |
54 | }; | |
55 | ||
84b74595 AT |
56 | struct NEDstate { |
57 | bool halted; | |
58 | uint8_t ram[RAM_LENGTH]; | |
d87b1e06 AT |
59 | /* Although NED is multi-threaded, this screensaver is restricted to a single thread. */ |
60 | struct NEDthread * thread[1]; | |
84b74595 AT |
61 | struct NEDthread * active_thread; |
62 | struct NEDhack * hack; | |
63 | }; | |
64 | ||
65 | enum syllables { | |
66 | MVSTCK = 0b00001111, | |
67 | JMP = 0b00001110, | |
68 | SWAP = 0b00001101, | |
69 | ADD = 0b00001100, | |
70 | XOR = 0b00001011, | |
71 | NOT = 0b00001010, | |
72 | OR = 0b00001001, | |
73 | AND = 0b00001000, | |
74 | BRZ = 0b00000111, | |
75 | TEST = 0b00000110, | |
76 | CMPSWP = 0b00000101, | |
77 | SHIFT = 0b00000100, | |
78 | STORE = 0b00000011, | |
79 | LOAD = 0b00000010, | |
80 | NOP = 0b00000001, | |
81 | HALT = 0b00000000 | |
82 | }; | |
83 | ||
5923644e | 84 | struct NEDstate * init_simulator(char * input_file); |
84b74595 AT |
85 | struct NEDstate * run_simulator(struct NEDstate * state); |
86 | uint32_t ram_r_word(struct NEDstate * state, uint32_t address); | |
87 |