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Commit | Line | Data |
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b3bb2fb8 CL |
1 | `include "ARM_Constants.v" |
2 | ||
3 | module Memory( | |
4 | input clk, | |
5 | input Nrst, | |
b3bb2fb8 | 6 | |
ab7ee9fc JW |
7 | input flush, |
8 | ||
b3bb2fb8 CL |
9 | /* bus interface */ |
10 | output reg [31:0] busaddr, | |
11 | output reg rd_req, | |
12 | output reg wr_req, | |
13 | input rw_wait, | |
14 | output reg [31:0] wr_data, | |
15 | input [31:0] rd_data, | |
9fc6c23c | 16 | output reg [2:0] data_size, |
b3bb2fb8 CL |
17 | |
18 | /* regfile interface */ | |
19 | output reg [3:0] st_read, | |
20 | input [31:0] st_data, | |
a02ca509 | 21 | |
979f2bd7 JW |
22 | /* Coprocessor interface */ |
23 | output reg cp_req, | |
24 | input cp_ack, | |
25 | input cp_busy, | |
804dc0bc | 26 | output reg cp_rnw, /* 1 = read from CP, 0 = write to CP */ |
43e4332c JW |
27 | input [31:0] cp_read, |
28 | output reg [31:0] cp_write, | |
979f2bd7 | 29 | |
a02ca509 JW |
30 | /* stage inputs */ |
31 | input inbubble, | |
32 | input [31:0] pc, | |
33 | input [31:0] insn, | |
e68b2378 JW |
34 | input [31:0] op0, |
35 | input [31:0] op1, | |
6d0f9d82 | 36 | input [31:0] op2, |
efd1aa13 CL |
37 | input [31:0] spsr, |
38 | input [31:0] cpsr, | |
fdecc897 | 39 | input cpsrup, |
a02ca509 JW |
40 | input write_reg, |
41 | input [3:0] write_num, | |
42 | input [31:0] write_data, | |
b3bb2fb8 | 43 | |
a02ca509 JW |
44 | /* outputs */ |
45 | output reg outstall, | |
46 | output reg outbubble, | |
b3bb2fb8 | 47 | output reg [31:0] outpc, |
a02ca509 JW |
48 | output reg [31:0] outinsn, |
49 | output reg out_write_reg = 1'b0, | |
50 | output reg [3:0] out_write_num = 4'bxxxx, | |
efd1aa13 | 51 | output reg [31:0] out_write_data = 32'hxxxxxxxx, |
ab7ee9fc | 52 | output reg [31:0] outspsr = 32'hxxxxxxxx, |
fdecc897 JW |
53 | output reg [31:0] outcpsr = 32'hxxxxxxxx, |
54 | output reg outcpsrup = 1'hx | |
a02ca509 | 55 | ); |
b3bb2fb8 | 56 | |
efd1aa13 | 57 | reg [31:0] addr, raddr, prev_raddr, next_regdata, next_outcpsr; |
fdecc897 | 58 | reg next_outcpsrup; |
666ceb03 | 59 | reg [31:0] prevaddr; |
e08b748a | 60 | reg [3:0] next_regsel, cur_reg, prev_reg; |
9a0d0e43 | 61 | reg next_writeback; |
e08b748a | 62 | |
804dc0bc JW |
63 | reg next_outbubble; |
64 | reg next_write_reg; | |
65 | reg [3:0] next_write_num; | |
66 | reg [31:0] next_write_data; | |
74d3729c | 67 | |
6d18bf27 | 68 | reg [3:0] lsr_state = 4'b0001, next_lsr_state; |
666ceb03 CL |
69 | reg [31:0] align_s1, align_s2, align_rddata; |
70 | ||
4d7253f1 | 71 | reg [2:0] lsrh_state = 3'b001, next_lsrh_state; |
666ceb03 CL |
72 | reg [31:0] lsrh_rddata; |
73 | reg [15:0] lsrh_rddata_s1; | |
74 | reg [7:0] lsrh_rddata_s2; | |
9a0d0e43 | 75 | |
b783a475 | 76 | reg [15:0] regs, next_regs; |
4d7253f1 | 77 | reg [3:0] lsm_state = 4'b0001, next_lsm_state; |
b114e03f | 78 | reg [5:0] offset, prev_offset, offset_sel; |
74d3729c | 79 | |
9a0d0e43 CL |
80 | reg [31:0] swp_oldval, next_swp_oldval; |
81 | reg [1:0] swp_state = 2'b01, next_swp_state; | |
6d18bf27 JW |
82 | |
83 | reg do_rd_data_latch; | |
84 | reg [31:0] rd_data_latch = 32'hxxxxxxxx; | |
a02ca509 JW |
85 | |
86 | always @(posedge clk) | |
87 | begin | |
88 | outpc <= pc; | |
89 | outinsn <= insn; | |
c65110a8 JW |
90 | outbubble <= next_outbubble; |
91 | out_write_reg <= next_write_reg; | |
92 | out_write_num <= next_write_num; | |
93 | out_write_data <= next_write_data; | |
e68b2378 | 94 | regs <= next_regs; |
e08b748a | 95 | prev_reg <= cur_reg; |
95704fd3 JW |
96 | if (!rw_wait) |
97 | prev_offset <= offset; | |
b114e03f | 98 | prev_raddr <= raddr; |
ab7ee9fc JW |
99 | outcpsr <= next_outcpsr; |
100 | outspsr <= spsr; | |
fdecc897 | 101 | outcpsrup <= next_outcpsrup; |
9a0d0e43 | 102 | swp_state <= next_swp_state; |
666ceb03 CL |
103 | lsm_state <= next_lsm_state; |
104 | lsr_state <= next_lsr_state; | |
105 | lsrh_state <= next_lsrh_state; | |
6d18bf27 JW |
106 | if (do_rd_data_latch) |
107 | rd_data_latch <= rd_data; | |
666ceb03 | 108 | prevaddr <= addr; |
a02ca509 | 109 | end |
d73619a2 JW |
110 | |
111 | reg delayedflush = 0; | |
112 | always @(posedge clk) | |
113 | if (flush && outstall /* halp! I can't do it now, maybe later? */) | |
114 | delayedflush <= 1; | |
115 | else if (!outstall /* anything has been handled this time around */) | |
116 | delayedflush <= 0; | |
b3bb2fb8 CL |
117 | |
118 | always @(*) | |
119 | begin | |
666ceb03 | 120 | addr = prevaddr; |
b3bb2fb8 CL |
121 | raddr = 32'hxxxxxxxx; |
122 | rd_req = 1'b0; | |
123 | wr_req = 1'b0; | |
124 | wr_data = 32'hxxxxxxxx; | |
125 | busaddr = 32'hxxxxxxxx; | |
2bcc55d5 | 126 | data_size = 3'bxxx; |
b3bb2fb8 | 127 | outstall = 1'b0; |
cc1ce5b3 | 128 | st_read = 4'hx; |
6d18bf27 | 129 | do_rd_data_latch = 0; |
a02ca509 JW |
130 | next_write_reg = write_reg; |
131 | next_write_num = write_num; | |
132 | next_write_data = write_data; | |
c65110a8 | 133 | next_outbubble = inbubble; |
9a0d0e43 | 134 | next_regs = regs; |
979f2bd7 | 135 | cp_req = 1'b0; |
43e4332c JW |
136 | cp_rnw = 1'bx; |
137 | cp_write = 32'hxxxxxxxx; | |
b114e03f | 138 | offset = prev_offset; |
4d7253f1 | 139 | next_outcpsr = lsm_state == 4'b0010 ? outcpsr : cpsr; |
fdecc897 | 140 | next_outcpsrup = cpsrup; |
666ceb03 | 141 | lsrh_rddata = 32'hxxxxxxxx; |
9fc6c23c CL |
142 | lsrh_rddata_s1 = 16'hxxxx; |
143 | lsrh_rddata_s2 = 8'hxx; | |
9a0d0e43 CL |
144 | next_lsm_state = lsm_state; |
145 | next_lsr_state = lsr_state; | |
666ceb03 | 146 | next_lsrh_state = lsrh_state; |
9a0d0e43 CL |
147 | next_swp_oldval = swp_oldval; |
148 | next_swp_state = swp_state; | |
149 | cur_reg = prev_reg; | |
9f082c0b | 150 | |
5989b2f5 | 151 | /* XXX shit not given about endianness */ |
d73619a2 | 152 | casez(insn) |
5989b2f5 CL |
153 | `DECODE_ALU_SWP: if(!inbubble) begin |
154 | outstall = rw_wait; | |
155 | next_outbubble = rw_wait; | |
156 | busaddr = {op0[31:2], 2'b0}; | |
2bcc55d5 | 157 | data_size = insn[22] ? 3'b001 : 3'b100; |
5989b2f5 CL |
158 | case(swp_state) |
159 | 2'b01: begin | |
160 | rd_req = 1'b1; | |
161 | outstall = 1'b1; | |
162 | if(!rw_wait) begin | |
163 | next_swp_state = 2'b10; | |
164 | next_swp_oldval = rd_data; | |
9a0d0e43 | 165 | end |
fb529aac | 166 | $display("SWP: read stage"); |
9a0d0e43 | 167 | end |
5989b2f5 CL |
168 | 2'b10: begin |
169 | wr_req = 1'b1; | |
2bcc55d5 | 170 | wr_data = insn[22] ? {4{op1[7:0]}} : op1; |
5989b2f5 CL |
171 | next_write_reg = 1'b1; |
172 | next_write_num = insn[15:12]; | |
2bcc55d5 | 173 | next_write_data = insn[22] ? {24'b0, swp_oldval[7:0]} : swp_oldval; |
5989b2f5 CL |
174 | if(!rw_wait) |
175 | next_swp_state = 2'b01; | |
fb529aac | 176 | $display("SWP: write stage"); |
5989b2f5 CL |
177 | end |
178 | default: begin end | |
179 | endcase | |
9a0d0e43 | 180 | end |
fb529aac | 181 | `DECODE_ALU_MULT: begin end |
666ceb03 CL |
182 | `DECODE_ALU_HDATA_REG, |
183 | `DECODE_ALU_HDATA_IMM: if(!inbubble) begin | |
184 | next_outbubble = rw_wait; | |
185 | outstall = rw_wait; | |
186 | addr = insn[23] ? op0 + op1 : op0 - op1; /* up/down select */ | |
187 | raddr = insn[24] ? op0 : addr; /* pre/post increment */ | |
188 | busaddr = raddr; | |
189 | /* rotate to correct position */ | |
190 | case(insn[6:5]) | |
191 | 2'b00: begin end /* swp */ | |
192 | 2'b01: begin /* unsigned half */ | |
193 | wr_data = {2{op2[15:0]}}; /* XXX need to store halfword */ | |
2bcc55d5 | 194 | data_size = 3'b010; |
666ceb03 CL |
195 | lsrh_rddata = {16'b0, raddr[1] ? rd_data[31:16] : rd_data[15:0]}; |
196 | end | |
197 | 2'b10: begin /* signed byte */ | |
198 | wr_data = {4{op2[7:0]}}; | |
2bcc55d5 | 199 | data_size = 3'b001; |
666ceb03 CL |
200 | lsrh_rddata_s1 = raddr[1] ? rd_data[31:16] : rd_data[15:0]; |
201 | lsrh_rddata_s2 = raddr[0] ? lsrh_rddata_s1[15:8] : lsrh_rddata_s1[7:0]; | |
202 | lsrh_rddata = {{24{lsrh_rddata_s2[7]}}, lsrh_rddata_s2}; | |
203 | end | |
204 | 2'b11: begin /* signed half */ | |
205 | wr_data = {2{op2[15:0]}}; | |
2bcc55d5 | 206 | data_size = 3'b010; |
666ceb03 CL |
207 | lsrh_rddata = raddr[1] ? {{16{rd_data[31]}}, rd_data[31:16]} : {{16{rd_data[15]}}, rd_data[15:0]}; |
208 | end | |
209 | endcase | |
210 | ||
211 | case(lsrh_state) | |
4d7253f1 | 212 | 3'b001: begin |
666ceb03 CL |
213 | rd_req = insn[20]; |
214 | wr_req = ~insn[20]; | |
215 | next_write_num = insn[15:12]; | |
216 | next_write_data = lsrh_rddata; | |
217 | if(insn[20]) begin | |
218 | next_write_reg = 1'b1; | |
219 | end | |
d64d6ef9 | 220 | if(insn[21] | !insn[24]) begin |
666ceb03 CL |
221 | outstall = 1'b1; |
222 | if(!rw_wait) | |
4d7253f1 | 223 | next_lsrh_state = 3'b010; |
666ceb03 | 224 | end |
fb529aac | 225 | $display("ALU_LDRSTRH: rd_req %d, wr_req %d", rd_req, wr_req); |
666ceb03 | 226 | end |
4d7253f1 JW |
227 | 3'b010: begin |
228 | next_outbubble = 1'b0; | |
666ceb03 CL |
229 | next_write_reg = 1'b1; |
230 | next_write_num = insn[19:16]; | |
231 | next_write_data = addr; | |
4d7253f1 JW |
232 | next_lsrh_state = 3'b100; |
233 | end | |
234 | 3'b100: begin | |
235 | outstall = 0; | |
236 | next_lsrh_state = 3'b001; | |
666ceb03 CL |
237 | end |
238 | default: begin end | |
239 | endcase | |
d64d6ef9 JW |
240 | |
241 | if ((lsrh_state == 3'b001) && flush) begin /* Reject it. */ | |
242 | outstall = 1'b0; | |
243 | next_lsrh_state = 3'b001; | |
244 | end | |
666ceb03 | 245 | end |
b3bb2fb8 | 246 | `DECODE_LDRSTR_UNDEFINED: begin end |
5989b2f5 CL |
247 | `DECODE_LDRSTR: if(!inbubble) begin |
248 | next_outbubble = rw_wait; | |
249 | outstall = rw_wait; | |
250 | addr = insn[23] ? op0 + op1 : op0 - op1; /* up/down select */ | |
feb2b5be | 251 | raddr = insn[24] ? addr : op0; /* pre/post increment */ |
666ceb03 CL |
252 | busaddr = raddr; |
253 | /* rotate to correct position */ | |
5989b2f5 CL |
254 | align_s1 = raddr[1] ? {rd_data[15:0], rd_data[31:16]} : rd_data; |
255 | align_s2 = raddr[0] ? {align_s1[7:0], align_s1[31:8]} : align_s1; | |
256 | /* select byte or word */ | |
257 | align_rddata = insn[22] ? {24'b0, align_s2[7:0]} : align_s2; | |
6d18bf27 | 258 | wr_data = insn[22] ? {24'h0, {op2[7:0]}} : op2; |
2bcc55d5 | 259 | data_size = insn[22] ? 3'b001 : 3'b100; |
5989b2f5 | 260 | case(lsr_state) |
6d18bf27 JW |
261 | 4'b0001: begin |
262 | rd_req = insn[20] /* L */ || insn[22] /* B */; | |
263 | wr_req = !insn[20] /* L */ && !insn[22]/* B */; | |
fb529aac | 264 | next_write_reg = insn[20] /* L */; |
666ceb03 | 265 | next_write_num = insn[15:12]; |
fb529aac | 266 | if(insn[20] /* L */) begin |
6d18bf27 | 267 | next_write_data = insn[22] /* B */ ? {24'h0, align_rddata[7:0]} : align_rddata; |
a02ca509 | 268 | end |
6d18bf27 JW |
269 | if (insn[22] /* B */ && !insn[20] /* L */) begin |
270 | do_rd_data_latch = 1; | |
271 | outstall = 1'b1; | |
272 | if (!rw_wait) | |
273 | next_lsr_state = 4'b0010; /* XXX: One-hot, my ass. */ | |
274 | end else if(insn[21] /* W */ | !insn[24] /* P */) begin | |
5989b2f5 CL |
275 | outstall = 1'b1; |
276 | if(!rw_wait) | |
6d18bf27 | 277 | next_lsr_state = 4'b0100; |
a02ca509 | 278 | end |
d73619a2 | 279 | $display("LDRSTR: rd_req %d, wr_req %d, raddr %08x, wait %d", rd_req, wr_req, raddr, rw_wait); |
b3bb2fb8 | 280 | end |
6d18bf27 JW |
281 | 4'b0010: begin |
282 | $display("LDRSTR: Handling STRB"); | |
4d7253f1 | 283 | outstall = 1; |
6d18bf27 JW |
284 | rd_req = 0; |
285 | wr_req = 1; | |
286 | next_write_reg = 0; | |
287 | case (busaddr[1:0]) | |
288 | 2'b00: wr_data = {rd_data_latch[31:8], op2[7:0]}; | |
289 | 2'b01: wr_data = {rd_data_latch[31:16], op2[7:0], rd_data_latch[7:0]}; | |
290 | 2'b10: wr_data = {rd_data_latch[31:24], op2[7:0], rd_data_latch[15:0]}; | |
291 | 2'b11: wr_data = {op2[7:0], rd_data_latch[23:0]}; | |
292 | endcase | |
293 | if(insn[21] /* W */ | !insn[24] /* P */) begin | |
294 | if(!rw_wait) | |
295 | next_lsr_state = 4'b0100; | |
296 | end else if (!rw_wait) | |
297 | next_lsr_state = 4'b1000; | |
298 | end | |
299 | 4'b0100: begin | |
300 | outstall = 1; | |
301 | rd_req = 0; | |
302 | wr_req= 0; | |
4d7253f1 | 303 | next_outbubble = 0; |
5989b2f5 CL |
304 | next_write_reg = 1'b1; |
305 | next_write_num = insn[19:16]; | |
306 | next_write_data = addr; | |
6d18bf27 | 307 | next_lsr_state = 4'b1000; |
4d7253f1 | 308 | end |
6d18bf27 JW |
309 | 4'b1000: begin |
310 | rd_req = 0; | |
311 | wr_req= 0; | |
4d7253f1 | 312 | outstall = 0; |
6d18bf27 | 313 | next_lsr_state = 4'b0001; |
5989b2f5 CL |
314 | end |
315 | default: begin end | |
316 | endcase | |
d64d6ef9 | 317 | |
6d18bf27 | 318 | if ((lsr_state == 4'b0001) && flush) begin /* Reject it. */ |
d64d6ef9 | 319 | outstall = 1'b0; |
6d18bf27 | 320 | next_lsr_state = 4'b0001; |
d64d6ef9 | 321 | end |
b3bb2fb8 | 322 | end |
5989b2f5 CL |
323 | /* XXX ldm/stm incorrect in that stupid case where one of the listed regs is the base reg */ |
324 | `DECODE_LDMSTM: if(!inbubble) begin | |
9a0d0e43 CL |
325 | outstall = rw_wait; |
326 | next_outbubble = rw_wait; | |
2bcc55d5 | 327 | data_size = 3'b100; |
9a0d0e43 | 328 | case(lsm_state) |
4d7253f1 | 329 | 4'b0001: begin |
b114e03f CL |
330 | // next_regs = insn[23] ? op1[15:0] : op1[0:15]; |
331 | /** verilator can suck my dick */ | |
b957d34d JW |
332 | $display("LDMSTM: Round 1: base register: %08x, reg list %b", op0, op1[15:0]); |
333 | next_regs = insn[23] /* U */ ? op1[15:0] : {op1[0], op1[1], op1[2], op1[3], op1[4], op1[5], op1[6], op1[7], | |
334 | op1[8], op1[9], op1[10], op1[11], op1[12], op1[13], op1[14], op1[15]}; | |
b114e03f | 335 | offset = 6'b0; |
d64d6ef9 JW |
336 | outstall = 1'b1; |
337 | next_lsm_state = 4'b0010; | |
e08b748a | 338 | end |
4d7253f1 | 339 | 4'b0010: begin |
9a0d0e43 CL |
340 | rd_req = insn[20]; |
341 | wr_req = ~insn[20]; | |
9f082c0b CL |
342 | casez(regs) |
343 | 16'b???????????????1: begin | |
e08b748a | 344 | cur_reg = 4'h0; |
b114e03f | 345 | next_regs = {regs[15:1], 1'b0}; |
9f082c0b CL |
346 | end |
347 | 16'b??????????????10: begin | |
e08b748a | 348 | cur_reg = 4'h1; |
b114e03f | 349 | next_regs = {regs[15:2], 2'b0}; |
9f082c0b CL |
350 | end |
351 | 16'b?????????????100: begin | |
e08b748a | 352 | cur_reg = 4'h2; |
b114e03f | 353 | next_regs = {regs[15:3], 3'b0}; |
9f082c0b CL |
354 | end |
355 | 16'b????????????1000: begin | |
e08b748a | 356 | cur_reg = 4'h3; |
b114e03f | 357 | next_regs = {regs[15:4], 4'b0}; |
9f082c0b CL |
358 | end |
359 | 16'b???????????10000: begin | |
e08b748a | 360 | cur_reg = 4'h4; |
b114e03f | 361 | next_regs = {regs[15:5], 5'b0}; |
9f082c0b CL |
362 | end |
363 | 16'b??????????100000: begin | |
e08b748a | 364 | cur_reg = 4'h5; |
b114e03f | 365 | next_regs = {regs[15:6], 6'b0}; |
9f082c0b CL |
366 | end |
367 | 16'b?????????1000000: begin | |
e08b748a | 368 | cur_reg = 4'h6; |
b114e03f | 369 | next_regs = {regs[15:7], 7'b0}; |
9f082c0b CL |
370 | end |
371 | 16'b????????10000000: begin | |
e08b748a | 372 | cur_reg = 4'h7; |
b114e03f | 373 | next_regs = {regs[15:8], 8'b0}; |
9f082c0b CL |
374 | end |
375 | 16'b???????100000000: begin | |
e08b748a | 376 | cur_reg = 4'h8; |
b114e03f | 377 | next_regs = {regs[15:9], 9'b0}; |
9f082c0b CL |
378 | end |
379 | 16'b??????1000000000: begin | |
e08b748a | 380 | cur_reg = 4'h9; |
b114e03f | 381 | next_regs = {regs[15:10], 10'b0}; |
9f082c0b CL |
382 | end |
383 | 16'b?????10000000000: begin | |
e08b748a | 384 | cur_reg = 4'hA; |
b114e03f | 385 | next_regs = {regs[15:11], 11'b0}; |
9f082c0b CL |
386 | end |
387 | 16'b????100000000000: begin | |
e08b748a | 388 | cur_reg = 4'hB; |
b114e03f | 389 | next_regs = {regs[15:12], 12'b0}; |
9f082c0b CL |
390 | end |
391 | 16'b???1000000000000: begin | |
e08b748a | 392 | cur_reg = 4'hC; |
b114e03f | 393 | next_regs = {regs[15:13], 13'b0}; |
9f082c0b CL |
394 | end |
395 | 16'b??10000000000000: begin | |
e08b748a | 396 | cur_reg = 4'hD; |
b114e03f | 397 | next_regs = {regs[15:14], 14'b0}; |
9f082c0b CL |
398 | end |
399 | 16'b?100000000000000: begin | |
e08b748a | 400 | cur_reg = 4'hE; |
b114e03f | 401 | next_regs = {regs[15], 15'b0}; |
9f082c0b CL |
402 | end |
403 | 16'b1000000000000000: begin | |
e08b748a | 404 | cur_reg = 4'hF; |
9f082c0b CL |
405 | next_regs = 16'b0; |
406 | end | |
407 | default: begin | |
e08b748a CL |
408 | cur_reg = 4'hx; |
409 | next_regs = 16'b0; | |
9f082c0b CL |
410 | end |
411 | endcase | |
b957d34d | 412 | cur_reg = insn[23] ? cur_reg : 4'hF - cur_reg; |
efd1aa13 CL |
413 | if(cur_reg == 4'hF && insn[22]) begin |
414 | next_outcpsr = spsr; | |
fdecc897 | 415 | next_outcpsrup = 1; |
efd1aa13 | 416 | end |
b114e03f | 417 | |
95704fd3 | 418 | offset = prev_offset + 6'h4; |
d73619a2 JW |
419 | offset_sel = insn[24] ? offset : prev_offset; |
420 | raddr = insn[23] ? op0 + {26'b0, offset_sel} : op0 - {26'b0, offset_sel}; | |
421 | if(insn[20]) begin | |
422 | next_write_reg = !rw_wait; | |
423 | next_write_num = cur_reg; | |
424 | next_write_data = rd_data; | |
425 | end | |
426 | if (rw_wait) begin | |
427 | next_regs = regs; | |
428 | cur_reg = prev_reg; /* whoops, do this one again */ | |
b114e03f CL |
429 | end |
430 | ||
431 | st_read = cur_reg; | |
b957d34d | 432 | wr_data = (cur_reg == 4'hF) ? (pc + 12) : st_data; |
666ceb03 | 433 | busaddr = raddr; |
b957d34d | 434 | |
d73619a2 | 435 | $display("LDMSTM: Stage 2: Writing: regs %b, next_regs %b, reg %d, wr_data %08x, addr %08x", regs, next_regs, cur_reg, wr_data, busaddr); |
9a0d0e43 CL |
436 | |
437 | outstall = 1'b1; | |
438 | ||
439 | if(next_regs == 16'b0) begin | |
4d7253f1 | 440 | next_lsm_state = 4'b0100; |
9a0d0e43 CL |
441 | end |
442 | end | |
4d7253f1 JW |
443 | 4'b0100: begin |
444 | outstall = 1; | |
445 | next_outbubble = 0; | |
b957d34d | 446 | next_write_reg = insn[21] /* writeback */; |
9a0d0e43 CL |
447 | next_write_num = insn[19:16]; |
448 | next_write_data = insn[23] ? op0 + {26'b0, prev_offset} : op0 - {26'b0, prev_offset}; | |
4d7253f1 | 449 | next_lsm_state = 4'b1000; |
d73619a2 | 450 | $display("LDMSTM: Stage 3: Writing back"); |
b783a475 | 451 | end |
4d7253f1 JW |
452 | 4'b1000: begin |
453 | outstall = 0; | |
454 | next_lsm_state = 4'b0001; | |
455 | end | |
d73619a2 | 456 | default: $stop; |
9a0d0e43 | 457 | endcase |
d64d6ef9 JW |
458 | if ((lsm_state == 4'b0001) && flush) begin /* Reject it. */ |
459 | outstall = 1'b0; | |
460 | next_lsm_state = 4'b0001; | |
461 | end | |
d73619a2 | 462 | $display("LDMSTM: Decoded, bubble %d, insn %08x, lsm state %b -> %b, stall %d", inbubble, insn, lsm_state, next_lsm_state, outstall); |
b3bb2fb8 | 463 | end |
5989b2f5 | 464 | `DECODE_LDCSTC: if(!inbubble) begin |
43e4332c JW |
465 | $display("WARNING: Unimplemented LDCSTC"); |
466 | end | |
5989b2f5 | 467 | `DECODE_CDP: if(!inbubble) begin |
43e4332c JW |
468 | cp_req = 1; |
469 | if (cp_busy) begin | |
470 | outstall = 1; | |
471 | next_outbubble = 1; | |
472 | end | |
473 | if (!cp_ack) begin | |
474 | /* XXX undefined instruction trap */ | |
475 | $display("WARNING: Possible CDP undefined instruction"); | |
476 | end | |
477 | end | |
5989b2f5 | 478 | `DECODE_MRCMCR: if(!inbubble) begin |
43e4332c JW |
479 | cp_req = 1; |
480 | cp_rnw = insn[20] /* L */; | |
481 | if (insn[20] == 0 /* store to coprocessor */) | |
482 | cp_write = op0; | |
483 | else begin | |
d1d0eb8e JW |
484 | if (insn[15:12] != 4'hF /* Fuck you ARM */) begin |
485 | next_write_reg = 1'b1; | |
486 | next_write_num = insn[15:12]; | |
487 | next_write_data = cp_read; | |
fdecc897 | 488 | end else begin |
d1d0eb8e | 489 | next_outcpsr = {cp_read[31:28], cpsr[27:0]}; |
fdecc897 JW |
490 | next_outcpsrup = 1; |
491 | end | |
43e4332c JW |
492 | end |
493 | if (cp_busy) begin | |
494 | outstall = 1; | |
495 | next_outbubble = 1; | |
496 | end | |
497 | if (!cp_ack) begin | |
838e283e | 498 | $display("WARNING: Possible MRCMCR undefined instruction: cp_ack %d, cp_busy %d",cp_ack, cp_busy); |
43e4332c | 499 | end |
838e283e | 500 | $display("MRCMCR: ack %d, busy %d", cp_ack, cp_busy); |
43e4332c | 501 | end |
b3bb2fb8 CL |
502 | default: begin end |
503 | endcase | |
d73619a2 JW |
504 | |
505 | if ((flush || delayedflush) && !outstall) | |
506 | next_outbubble = 1'b1; | |
b3bb2fb8 | 507 | end |
b3bb2fb8 | 508 | endmodule |