source: liacs/ca/opdr2b/src/control.c@ 6

Last change on this file since 6 was 2, checked in by Rick van der Zwet, 15 years ago

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1/* Author : Rick van der Zwet
2 * S-number : 0433373
3 * Version : $Id: control.c 366 2007-12-04 18:29:07Z rick $
4 * Copyright : FreeBSD Licence
5 * Description : Memory unit
6 */
7
8#include <stdlib.h>
9#include <stdio.h>
10#include <sysexits.h>
11#include "control.h"
12#include "memory.h"
13#include "datapath.h"
14
15/* fcode, ocode, target */
16#define DECODE2_SIZE 17
17const decode_t decode2[DECODE2_SIZE] = {
18 { 8, 0, 18}, /* ADDI */
19 { 9, 0, 18}, /* ADDIU */
20 {10, 0, 39}, /* SLTI */
21 {11, 0, 39}, /* SLTIU */
22 {12, 0, 19}, /* ANDI */
23 {13, 0, 21}, /* ORI */
24 {14, 0, 23}, /* XORI */
25 {15, 0, 36}, /* LUI */
26 {32, 0, 59}, /* LB */
27 {33, 0, 65}, /* LH */
28 {35, 0, 71}, /* LW */
29 {36, 0, 62}, /* LBU */
30 {37, 0, 68}, /* LHU */
31 {40, 0, 44}, /* SB */
32 {41, 0, 50}, /* SH */
33 {43, 0, 56}, /* SW */
34};
35
36/* fcode, ocode, target */
37#define DECODE3_SIZE 20
38const decode_t decode3[DECODE3_SIZE] = {
39 { 0, 0, 27}, /* SLL */
40 { 2, 0, 28}, /* SRL */
41 { 3, 0, 29}, /* SRA */
42 { 4, 0, 30}, /* SLLV */
43 { 6, 0, 32}, /* SRLV */
44 { 7, 0, 34}, /* SRAV */
45 { 8, 0, 42}, /* JR */
46 { 9, 0, 37}, /* JALR */
47 {13, 0, 43}, /* BREAK */
48 {32, 0, 18}, /* ADD */
49 {33, 0, 18}, /* ADDU */
50 {34, 0, 26}, /* SUB */
51 {35, 0, 26}, /* SUBU */
52 {36, 0, 20}, /* AND */
53 {37, 0, 22}, /* OR */
54 {38, 0, 24}, /* XOR */
55 {39, 0, 25}, /* NOR */
56 {42, 0, 39}, /* SLT */
57 {43, 0, 39}, /* SLTU */
58};
59
60/*
61 * address, s1, s2, mux, constant, imm, alu, memory, a, b, c, temp, temp2, pc,
62 * mar, mdr, ir, reg, register_address_a, register_address_b,
63 * register_address_c, cond, jump
64 * XXX: Needs more pretty writing, the enums defined should be used
65 * XXX: More flexible input
66 */
67microcode_t microprogram[75] = {
68 { 0, {5, 0, 0, 0, 0, 5, 1, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0}, 2, 0},
69 { 1, {5, 8, 0, 4, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 3, 0, 0, 0}, 3, 0},
70 { 2, {1, 9, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0}, 0, 0},
71 { 3, {6, 8, 0, 3, 0, 2, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0}, 0, 0},
72 { 4, {6, 8, 0,12, 0, 2, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0}, 0, 0},
73 { 5, {0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0}, 2, 5},
74 { 6, {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, 4, 0},
75 { 7, {1, 2, 0, 0, 0,10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, 6,10},
76 { 8, {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, 1, 0},
77 { 9, {1, 2, 0, 0, 0,10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, 6, 0},
78 {10, {5, 9, 0, 0, 5, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0}, 1, 0},
79 {11, {5, 8, 0, 5, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, 0, 0},
80 {12, {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 4, 0, 0,31}, 0, 0},
81 {13, {5, 8, 0, 9, 0, 2, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0}, 0, 0},
82 {14, {9, 8, 0, 2, 3, 7, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0}, 0, 0},
83 {15, {5, 3, 0, 0, 0, 4, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0}, 1, 0},
84 {16, {0, 2, 0, 0, 0, 6, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0}, 5, 0},
85 {17, {0, 9, 0, 0, 1, 6, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, 4, 0},
86 {18, {3, 1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, 1,72},
87 {19, {0, 9, 0, 0, 4, 6, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0}, 0, 0},
88 {20, {1, 3, 0, 0, 0, 2, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, 1,72},
89 {21, {0, 9, 0, 0, 4, 6, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0}, 0, 0},
90 {22, {1, 3, 0, 0, 0, 4, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, 1,72},
91 {23, {0, 9, 0, 0, 4, 6, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0}, 0, 0},
92 {24, {1, 3, 0, 0, 0,11, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, 1,72},
93 {25, {1, 3, 0, 0, 0, 3, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, 1,72},
94 {26, {1, 3, 0, 0, 0,10, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, 1,72},
95 {27, {3, 9, 0, 0, 2, 7, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, 1,72},
96 {28, {3, 9, 0, 0, 2, 9, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, 1,72},
97 {29, {3, 9, 0, 0, 2, 8, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, 1,72},
98 {30, {1, 8, 0, 8, 0, 2, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0}, 0, 0},
99 {31, {3, 4, 0, 0, 0, 7, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, 1,72},
100 {32, {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, 0, 0},
101 {33, {3, 4, 0, 0, 0, 9, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, 1,72},
102 {34, {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, 0, 0},
103 {35, {3, 4, 0, 0, 0, 8, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, 1,72},
104 {36, {3, 8, 0, 6, 0, 7, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, 1,72},
105 {37, {5, 8, 0, 5, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, 0, 0},
106 {38, {1, 0, 0, 0, 0, 5, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0}, 1,72},
107 {39, {1, 3, 0, 0, 0,10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, 7,41},
108 {40, {0, 8, 0, 0, 0, 6, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, 1,72},
109 {41, {0, 8, 0, 1, 0, 6, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, 1,72},
110 {42, {1, 0, 0, 0, 0, 5, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0}, 1, 0},
111 {43, {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, 1,43},
112 {44, {3, 8, 0, 3, 0, 7, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0}, 0, 0},
113 {45, {2, 8, 0, 7, 0, 7, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0}, 0, 0},
114 {46, {3, 4, 0, 0, 0, 9, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0}, 0, 0},
115 {47, {8, 4, 0,11, 0, 9, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0}, 0, 0},
116 {48, {7, 4, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0}, 0, 0},
117 {49, {3, 7, 0, 0, 0, 4, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0}, 1,57},
118 {50, {3, 8, 0, 3, 0, 7, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0}, 0, 0},
119 {51, {2, 8, 0, 6, 0, 7, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0}, 0, 0},
120 {52, {3, 4, 0, 0, 0, 9, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0}, 0, 0},
121 {53, {8, 4, 0,10, 0, 9, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0}, 0, 0},
122 {54, {7, 4, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0}, 0, 0},
123 {55, {3, 7, 0, 0, 0, 4, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0}, 1,57},
124 {56, {2, 0, 0, 0, 0, 5, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0}, 0, 0},
125 {57, {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, 2,57},
126 {58, {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, 1, 0},
127 {59, {3, 8, 0, 3, 0, 7, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0}, 0, 0},
128 {60, {7, 3, 0, 0, 0, 7, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0}, 0, 0},
129 {61, {3, 8, 0, 7, 0, 8, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, 1,72},
130 {62, {3, 8, 0, 3, 0, 7, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0}, 0, 0},
131 {63, {7, 3, 0, 0, 0, 7, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0}, 0, 0},
132 {64, {3, 8, 0, 7, 0, 9, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, 1,72},
133 {65, {3, 8, 0, 3, 0, 7, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0}, 0, 0},
134 {66, {7, 3, 0, 0, 0, 7, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0}, 0, 0},
135 {67, {3, 8, 0, 6, 0, 8, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, 1,72},
136 {68, {3, 8, 0, 3, 0, 7, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0}, 0, 0},
137 {69, {7, 3, 0, 0, 0, 7, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0}, 0, 0},
138 {70, {3, 8, 0, 6, 0, 9, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, 1,72},
139 {71, {7, 0, 0, 0, 0, 5, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, 0, 0},
140 {72, {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, 8,74},
141 {73, {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 4, 0, 0, 0}, 1, 0},
142 {74, {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 4, 0, 0, 0}, 1, 0},
143};
144
145void
146control_init()
147{
148 int i = 0; /* Loop counter */
149 mpc = 0;
150 a = 0;
151 b = 0;
152 c = 0;
153 temp = 0;
154 temp2 = 0;
155 pc = 0;
156 mar = 0;
157 mdr = 0;
158 ir = 0;
159 imm = 0;
160 constant = 0;
161 for (i = 0; i < 32; i++)
162 reg[i] = 0;
163}
164
165
166void
167find_new_mPC()
168{
169 word tcode = 0;
170 int i; /* Loop counter */
171 micro_address_t next_mpc;
172 switch (microprogram[mpc].cond) {
173 case NEXT:
174 next_mpc = mpc + 1;
175 break;
176 case UNCOND:
177 next_mpc = microprogram[mpc].jump;
178 break;
179 case MEMBUSY:
180 if (mem_busy == FALSE)
181 next_mpc = mpc + 1;
182 else
183 next_mpc = microprogram[mpc].jump;
184 break;
185 case DECODE1:
186 /* XXX: Hardcoded, need something better */
187 tcode = ir >> 26; /* O-code */
188 if (tcode >= 32) /* MEM */
189 next_mpc = 2;
190 else if (tcode >= 8) /* IMM */
191 next_mpc = 17;
192 else if (tcode == 5) /* BNQ */
193 next_mpc = 9;
194 else if (tcode == 4) /* BEQ */
195 next_mpc = 7;
196 else if (tcode == 3) /* JAL */
197 next_mpc = 11;
198 else if (tcode == 2) /* J */
199 next_mpc = 13;
200 else if (tcode == 0) /* REG */
201 next_mpc = 16;
202 break;
203 case DECODE2:
204 tcode = ir >> 26; /* O-code */
205 for (i = 0; i < DECODE2_SIZE; i++) {
206 if (decode2[i].ocode == tcode) {
207 next_mpc = decode2[i].target;
208 break;
209 }
210 }
211 break;
212 case DECODE3:
213 tcode = (ir << 26) >> 26; /* F-code */
214 for (i = 0; i < DECODE3_SIZE; i++) {
215 if (decode3[i].fcode == tcode) {
216 next_mpc = decode2[i].target;
217 break;
218 }
219 }
220 break;
221 case ZEROVALUE:
222 if (zero == TRUE)
223 next_mpc = microprogram[mpc].jump;
224 else
225 next_mpc = mpc + 1;
226 break;
227 case NEGVALUE:
228 if (negative == TRUE)
229 next_mpc = microprogram[mpc].jump;
230 else
231 next_mpc = mpc + 1;
232 break;
233 case RTYPEIR:
234 if ((ir >> 26) == 0)
235 next_mpc = microprogram[mpc].jump;
236 else
237 next_mpc = mpc + 1;
238 break;
239 default:
240 fprintf(stderr, "Control action '%i' not implemented\n",
241 microprogram[mpc].cond);
242 exit(EX_SOFTWARE);
243 break;
244 };
245
246 mpc = next_mpc;
247}
248
249
250void
251set_signals()
252{
253 /*
254 * XXX: Something like memory_busy or something like it
255 * XXX: Dirty hacking, we better off creating a sperate control
256 * struct which we 'feed' to datapath
257 */
258
259 switch (mpc) {
260 case 1:
261 mem_busy = TRUE;
262 microprogram[mpc].control.register_address_a = (ir << 6) >> 26;
263 microprogram[mpc].control.register_address_b = (ir << 11) >> 26;
264 break;
265 case 12:
266 microprogram[mpc].control.register_address_c = 31;
267 break;
268 case 73:
269 microprogram[mpc].control.register_address_c = (ir << 11) >> 26;
270 break;
271 case 74:
272 microprogram[mpc].control.register_address_c = (ir << 16) >> 26;
273 break;
274 }
275 update_state(microprogram[mpc].control);
276}
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