adamdunkels | 70c4c34 | 2003-04-24 17:01:17 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2001, Adam Dunkels. |
| 3 | * All rights reserved. |
| 4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions |
| 7 | * are met: |
| 8 | * 1. Redistributions of source code must retain the above copyright |
| 9 | * notice, this list of conditions and the following disclaimer. |
| 10 | * 2. Redistributions in binary form must reproduce the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer in the |
| 12 | * documentation and/or other materials provided with the distribution. |
adamdunkels | 9fe9ae9 | 2004-09-12 20:28:47 +0000 | [diff] [blame] | 13 | * 3. The name of the author may not be used to endorse or promote |
adamdunkels | 70c4c34 | 2003-04-24 17:01:17 +0000 | [diff] [blame] | 14 | * products derived from this software without specific prior |
| 15 | * written permission. |
| 16 | * |
| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS |
| 18 | * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
| 19 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY |
| 21 | * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE |
| 23 | * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| 24 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
| 25 | * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
| 26 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| 27 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 28 | * |
| 29 | * This file is part of the uIP TCP/IP stack. |
| 30 | * |
oliverschmidt | b30bf5a | 2005-02-24 22:04:53 +0000 | [diff] [blame] | 31 | * $Id: uip_arch.c,v 1.7 2005/02/24 22:04:53 oliverschmidt Exp $ |
adamdunkels | 70c4c34 | 2003-04-24 17:01:17 +0000 | [diff] [blame] | 32 | * |
| 33 | */ |
| 34 | |
| 35 | |
| 36 | #include "uip.h" |
| 37 | #include "uip_arch.h" |
| 38 | |
| 39 | #define BUF ((uip_tcpip_hdr *)&uip_buf[UIP_LLH_LEN]) |
| 40 | #define IP_PROTO_TCP 6 |
adamdunkels | 6968dcb | 2004-09-19 19:01:12 +0000 | [diff] [blame] | 41 | #define IP_PROTO_UDP 17 |
adamdunkels | 70c4c34 | 2003-04-24 17:01:17 +0000 | [diff] [blame] | 42 | |
| 43 | /*-----------------------------------------------------------------------------------*/ |
oliverschmidt | 11740ed | 2004-07-18 13:21:05 +0000 | [diff] [blame] | 44 | #pragma optimize(push, off) |
adamdunkels | 70c4c34 | 2003-04-24 17:01:17 +0000 | [diff] [blame] | 45 | void |
| 46 | uip_add32(u8_t *op32, u16_t op16) |
| 47 | { |
| 48 | asm("ldy #3"); |
| 49 | asm("jsr ldaxysp"); |
| 50 | asm("sta ptr1"); |
| 51 | asm("stx ptr1+1"); |
| 52 | asm("ldy #0"); |
| 53 | asm("lda (sp),y"); |
| 54 | asm("ldy #3"); |
| 55 | asm("clc"); |
| 56 | asm("adc (ptr1),y"); |
| 57 | asm("sta _uip_acc32+3"); |
| 58 | asm("dey"); |
| 59 | asm("lda (ptr1),y"); |
| 60 | asm("ldy #1"); |
| 61 | asm("adc (sp),y"); |
| 62 | asm("sta _uip_acc32+2"); |
| 63 | asm("ldy #1"); |
| 64 | asm("lda (ptr1),y"); |
| 65 | asm("adc #0"); |
| 66 | asm("sta _uip_acc32+1"); |
| 67 | asm("dey"); |
| 68 | asm("lda (ptr1),y"); |
| 69 | asm("adc #0"); |
| 70 | asm("sta _uip_acc32+0"); |
| 71 | } |
oliverschmidt | 11740ed | 2004-07-18 13:21:05 +0000 | [diff] [blame] | 72 | #pragma optimize(pop) |
adamdunkels | 70c4c34 | 2003-04-24 17:01:17 +0000 | [diff] [blame] | 73 | /*-----------------------------------------------------------------------------------*/ |
adamdunkels | 70c4c34 | 2003-04-24 17:01:17 +0000 | [diff] [blame] | 74 | static u16_t chksum_ptr, chksum_len, chksum_tmp; |
adamdunkels | 6968dcb | 2004-09-19 19:01:12 +0000 | [diff] [blame] | 75 | static u8_t chksum_protocol; |
adamdunkels | 70c4c34 | 2003-04-24 17:01:17 +0000 | [diff] [blame] | 76 | static u16_t chksum(void); |
| 77 | /*-----------------------------------------------------------------------------------*/ |
oliverschmidt | 11740ed | 2004-07-18 13:21:05 +0000 | [diff] [blame] | 78 | #pragma optimize(push, off) |
adamdunkels | 70c4c34 | 2003-04-24 17:01:17 +0000 | [diff] [blame] | 79 | u16_t |
| 80 | chksum(void) { |
| 81 | |
| 82 | asm("lda #0"); |
| 83 | asm("sta tmp1"); |
| 84 | asm("sta tmp1+1"); |
| 85 | asm("lda _chksum_ptr"); |
| 86 | asm("sta ptr1"); |
| 87 | asm("lda _chksum_ptr+1"); |
| 88 | asm("sta ptr1+1"); |
| 89 | |
| 90 | |
| 91 | asm("lda _chksum_len+1"); |
| 92 | asm("beq chksumlast"); |
| 93 | |
| 94 | |
| 95 | /* If checksum is > 256, do the first runs. */ |
| 96 | asm("ldy #0"); |
| 97 | asm("clc"); |
| 98 | asm("chksumloop_256:"); |
| 99 | asm("lda (ptr1),y"); |
| 100 | asm("adc tmp1"); |
| 101 | asm("sta tmp1"); |
| 102 | asm("iny"); |
| 103 | asm("lda (ptr1),y"); |
| 104 | asm("adc tmp1+1"); |
| 105 | asm("sta tmp1+1"); |
| 106 | asm("iny"); |
| 107 | asm("bne chksumloop_256"); |
| 108 | asm("inc ptr1+1"); |
| 109 | asm("dec _chksum_len+1"); |
| 110 | asm("bne chksumloop_256"); |
| 111 | |
| 112 | asm("chksum_endloop_256:"); |
| 113 | asm("lda tmp1"); |
| 114 | asm("adc #0"); |
| 115 | asm("sta tmp1"); |
| 116 | asm("lda tmp1+1"); |
| 117 | asm("adc #0"); |
| 118 | asm("sta tmp1+1"); |
| 119 | asm("bcs chksum_endloop_256"); |
| 120 | |
| 121 | asm("chksumlast:"); |
| 122 | asm("lda _chksum_len"); |
| 123 | asm("lsr"); |
| 124 | asm("bcc chksum_noodd"); |
| 125 | asm("ldy _chksum_len"); |
| 126 | asm("dey"); |
| 127 | asm("lda (ptr1),y"); |
| 128 | asm("clc"); |
| 129 | asm("adc tmp1"); |
| 130 | asm("sta tmp1"); |
| 131 | asm("bcc noinc1"); |
| 132 | asm("inc tmp1+1"); |
| 133 | asm("bne noinc1"); |
| 134 | asm("inc tmp1"); |
| 135 | asm("noinc1:"); |
| 136 | asm("dec _chksum_len"); |
| 137 | |
| 138 | asm("chksum_noodd:"); |
| 139 | asm("clc"); |
| 140 | asm("php"); |
| 141 | asm("ldy _chksum_len"); |
| 142 | asm("chksum_loop1:"); |
| 143 | asm("cpy #0"); |
| 144 | asm("beq chksum_loop1_end"); |
| 145 | asm("plp"); |
| 146 | asm("dey"); |
| 147 | asm("dey"); |
| 148 | asm("lda (ptr1),y"); |
| 149 | asm("adc tmp1"); |
| 150 | asm("sta tmp1"); |
| 151 | asm("iny"); |
| 152 | asm("lda (ptr1),y"); |
| 153 | asm("adc tmp1+1"); |
| 154 | asm("sta tmp1+1"); |
| 155 | asm("dey"); |
| 156 | asm("php"); |
| 157 | asm("jmp chksum_loop1"); |
| 158 | asm("chksum_loop1_end:"); |
| 159 | asm("plp"); |
| 160 | |
| 161 | asm("chksum_endloop:"); |
| 162 | asm("lda tmp1"); |
| 163 | asm("adc #0"); |
| 164 | asm("sta tmp1"); |
| 165 | asm("lda tmp1+1"); |
| 166 | asm("adc #0"); |
| 167 | asm("sta tmp1+1"); |
| 168 | asm("bcs chksum_endloop"); |
| 169 | |
| 170 | asm("lda tmp1"); |
| 171 | asm("ldx tmp1+1"); |
| 172 | } |
oliverschmidt | 11740ed | 2004-07-18 13:21:05 +0000 | [diff] [blame] | 173 | #pragma optimize(pop) |
adamdunkels | 70c4c34 | 2003-04-24 17:01:17 +0000 | [diff] [blame] | 174 | /*-----------------------------------------------------------------------------------*/ |
| 175 | u16_t |
| 176 | uip_chksum(u16_t *buf, u16_t len) |
| 177 | { |
| 178 | /* unsigned long sum; |
| 179 | |
| 180 | sum = 0; |
| 181 | |
| 182 | chksum_ptr = (u16_t)buf; |
| 183 | while(len >= 256) { |
| 184 | chksum_len = 256; |
| 185 | sum += chksum(); |
| 186 | len -= 256; |
| 187 | chksum_ptr += 256; |
| 188 | } |
| 189 | |
| 190 | if(len < 256) { |
| 191 | chksum_len = len; |
| 192 | sum += chksum(); |
| 193 | } |
| 194 | |
| 195 | while((sum >> 16) != 0) { |
| 196 | sum = (sum >> 16) + (sum & 0xffff); |
| 197 | } |
| 198 | |
| 199 | return sum;*/ |
| 200 | |
| 201 | chksum_len = len; |
| 202 | chksum_ptr = (u16_t)buf; |
| 203 | return chksum(); |
| 204 | } |
| 205 | /*-----------------------------------------------------------------------------------*/ |
| 206 | u16_t |
| 207 | uip_ipchksum(void) |
| 208 | { |
| 209 | chksum_ptr = (u16_t)uip_buf + UIP_LLH_LEN; |
oliverschmidt | b30bf5a | 2005-02-24 22:04:53 +0000 | [diff] [blame] | 210 | chksum_len = UIP_IPH_LEN; |
adamdunkels | 70c4c34 | 2003-04-24 17:01:17 +0000 | [diff] [blame] | 211 | return chksum(); |
| 212 | } |
| 213 | /*-----------------------------------------------------------------------------------*/ |
oliverschmidt | 11740ed | 2004-07-18 13:21:05 +0000 | [diff] [blame] | 214 | #pragma optimize(push, off) |
adamdunkels | 6968dcb | 2004-09-19 19:01:12 +0000 | [diff] [blame] | 215 | static u16_t |
| 216 | transport_chksum(u8_t protocol) |
| 217 | { |
| 218 | chksum_protocol = protocol; |
oliverschmidt | b30bf5a | 2005-02-24 22:04:53 +0000 | [diff] [blame] | 219 | chksum_ptr = (u16_t)&uip_buf[UIP_LLH_LEN + UIP_IPH_LEN]; |
| 220 | chksum_len = UIP_TCPH_LEN; |
adamdunkels | 70c4c34 | 2003-04-24 17:01:17 +0000 | [diff] [blame] | 221 | chksum_tmp = chksum(); |
| 222 | |
| 223 | chksum_ptr = (u16_t)uip_appdata; |
adamdunkels | 6968dcb | 2004-09-19 19:01:12 +0000 | [diff] [blame] | 224 | asm("lda _uip_buf+3+%b", UIP_LLH_LEN); |
adamdunkels | 70c4c34 | 2003-04-24 17:01:17 +0000 | [diff] [blame] | 225 | asm("sec"); |
oliverschmidt | b30bf5a | 2005-02-24 22:04:53 +0000 | [diff] [blame] | 226 | asm("sbc #%b", UIP_IPTCPH_LEN); |
adamdunkels | 70c4c34 | 2003-04-24 17:01:17 +0000 | [diff] [blame] | 227 | asm("sta _chksum_len"); |
adamdunkels | 6968dcb | 2004-09-19 19:01:12 +0000 | [diff] [blame] | 228 | asm("lda _uip_buf+2+%b", UIP_LLH_LEN); |
adamdunkels | 70c4c34 | 2003-04-24 17:01:17 +0000 | [diff] [blame] | 229 | asm("sbc #0"); |
| 230 | asm("sta _chksum_len+1"); |
| 231 | |
| 232 | asm("jsr %v", chksum); |
| 233 | |
| 234 | asm("clc"); |
| 235 | asm("adc _chksum_tmp"); |
| 236 | asm("sta _chksum_tmp"); |
| 237 | asm("txa"); |
| 238 | asm("adc _chksum_tmp+1"); |
| 239 | asm("sta _chksum_tmp+1"); |
| 240 | |
| 241 | /* Fold carry */ |
| 242 | /* asm("bcc noinc"); |
| 243 | asm("inc _chksum_tmp"); |
| 244 | asm("noinc:");*/ |
| 245 | |
| 246 | asm("tcpchksum_loop1:"); |
| 247 | asm("lda _chksum_tmp"); |
| 248 | asm("adc #0"); |
| 249 | asm("sta _chksum_tmp"); |
| 250 | asm("lda _chksum_tmp+1"); |
| 251 | asm("adc #0"); |
| 252 | asm("sta _chksum_tmp+1"); |
| 253 | asm("bcs tcpchksum_loop1"); |
| 254 | |
| 255 | |
adamdunkels | 6968dcb | 2004-09-19 19:01:12 +0000 | [diff] [blame] | 256 | asm("lda _uip_buf+3+%b", UIP_LLH_LEN); |
adamdunkels | 70c4c34 | 2003-04-24 17:01:17 +0000 | [diff] [blame] | 257 | asm("sec"); |
oliverschmidt | b30bf5a | 2005-02-24 22:04:53 +0000 | [diff] [blame] | 258 | asm("sbc #%b", UIP_IPH_LEN); |
adamdunkels | 70c4c34 | 2003-04-24 17:01:17 +0000 | [diff] [blame] | 259 | asm("sta _chksum_len"); |
adamdunkels | 6968dcb | 2004-09-19 19:01:12 +0000 | [diff] [blame] | 260 | asm("lda _uip_buf+2+%b", UIP_LLH_LEN); |
adamdunkels | 70c4c34 | 2003-04-24 17:01:17 +0000 | [diff] [blame] | 261 | asm("sbc #0"); |
| 262 | asm("sta _chksum_len+1"); |
| 263 | |
| 264 | |
| 265 | asm("ldy #$0c"); |
| 266 | asm("clc"); |
| 267 | asm("php"); |
| 268 | asm("tcpchksum_loop2:"); |
| 269 | asm("plp"); |
adamdunkels | 6968dcb | 2004-09-19 19:01:12 +0000 | [diff] [blame] | 270 | asm("lda _uip_buf+%b,y", UIP_LLH_LEN); |
adamdunkels | 70c4c34 | 2003-04-24 17:01:17 +0000 | [diff] [blame] | 271 | asm("adc _chksum_tmp"); |
| 272 | asm("sta _chksum_tmp"); |
| 273 | asm("iny"); |
adamdunkels | 6968dcb | 2004-09-19 19:01:12 +0000 | [diff] [blame] | 274 | asm("lda _uip_buf+%b,y", UIP_LLH_LEN); |
| 275 | asm("adc _chksum_tmp+1"); |
| 276 | asm("sta _chksum_tmp+1"); |
| 277 | asm("iny"); |
| 278 | asm("php"); |
| 279 | asm("cpy #$14"); |
| 280 | asm("bne tcpchksum_loop2"); |
| 281 | |
| 282 | asm("plp"); |
| 283 | |
| 284 | asm("lda _chksum_tmp"); |
| 285 | asm("adc #0"); |
| 286 | asm("sta _chksum_tmp"); |
| 287 | asm("lda _chksum_tmp+1"); |
| 288 | asm("adc %v", chksum_protocol); |
| 289 | asm("sta _chksum_tmp+1"); |
| 290 | |
| 291 | |
| 292 | asm("lda _chksum_tmp"); |
| 293 | asm("adc _chksum_len+1"); |
| 294 | asm("sta _chksum_tmp"); |
| 295 | asm("lda _chksum_tmp+1"); |
| 296 | asm("adc _chksum_len"); |
| 297 | asm("sta _chksum_tmp+1"); |
| 298 | |
| 299 | |
| 300 | |
| 301 | asm("tcpchksum_loop3:"); |
| 302 | asm("lda _chksum_tmp"); |
| 303 | asm("adc #0"); |
| 304 | asm("sta _chksum_tmp"); |
| 305 | asm("lda _chksum_tmp+1"); |
| 306 | asm("adc #0"); |
| 307 | asm("sta _chksum_tmp+1"); |
| 308 | asm("bcs tcpchksum_loop3"); |
| 309 | |
| 310 | |
| 311 | return chksum_tmp; |
| 312 | } |
| 313 | #pragma optimize(pop) |
| 314 | |
| 315 | /*-----------------------------------------------------------------------------------*/ |
| 316 | u16_t |
| 317 | uip_tcpchksum(void) |
| 318 | { |
| 319 | return transport_chksum(IP_PROTO_TCP); |
| 320 | #if 0 |
oliverschmidt | b30bf5a | 2005-02-24 22:04:53 +0000 | [diff] [blame] | 321 | chksum_ptr = (u16_t)&uip_buf[UIP_LLH_LEN + UIP_IPH_LEN]; |
| 322 | chksum_len = UIP_TCPH_LEN; |
adamdunkels | 6968dcb | 2004-09-19 19:01:12 +0000 | [diff] [blame] | 323 | chksum_tmp = chksum(); |
| 324 | |
| 325 | chksum_ptr = (u16_t)uip_appdata; |
| 326 | asm("lda _uip_buf+3+%b", UIP_LLH_LEN); |
| 327 | asm("sec"); |
oliverschmidt | b30bf5a | 2005-02-24 22:04:53 +0000 | [diff] [blame] | 328 | asm("sbc #%b", UIP_IPTCPH_LEN); |
adamdunkels | 6968dcb | 2004-09-19 19:01:12 +0000 | [diff] [blame] | 329 | asm("sta _chksum_len"); |
| 330 | asm("lda _uip_buf+2+%b", UIP_LLH_LEN); |
| 331 | asm("sbc #0"); |
| 332 | asm("sta _chksum_len+1"); |
| 333 | |
| 334 | asm("jsr %v", chksum); |
| 335 | |
| 336 | asm("clc"); |
| 337 | asm("adc _chksum_tmp"); |
| 338 | asm("sta _chksum_tmp"); |
| 339 | asm("txa"); |
| 340 | asm("adc _chksum_tmp+1"); |
| 341 | asm("sta _chksum_tmp+1"); |
| 342 | |
| 343 | /* Fold carry */ |
| 344 | /* asm("bcc noinc"); |
| 345 | asm("inc _chksum_tmp"); |
| 346 | asm("noinc:");*/ |
| 347 | |
| 348 | asm("tcpchksum_loop1:"); |
| 349 | asm("lda _chksum_tmp"); |
| 350 | asm("adc #0"); |
| 351 | asm("sta _chksum_tmp"); |
| 352 | asm("lda _chksum_tmp+1"); |
| 353 | asm("adc #0"); |
| 354 | asm("sta _chksum_tmp+1"); |
| 355 | asm("bcs tcpchksum_loop1"); |
| 356 | |
| 357 | |
| 358 | asm("lda _uip_buf+3+%b", UIP_LLH_LEN); |
| 359 | asm("sec"); |
oliverschmidt | b30bf5a | 2005-02-24 22:04:53 +0000 | [diff] [blame] | 360 | asm("sbc #%b", UIP_IPH_LEN); |
adamdunkels | 6968dcb | 2004-09-19 19:01:12 +0000 | [diff] [blame] | 361 | asm("sta _chksum_len"); |
| 362 | asm("lda _uip_buf+2+%b", UIP_LLH_LEN); |
| 363 | asm("sbc #0"); |
| 364 | asm("sta _chksum_len+1"); |
| 365 | |
| 366 | |
| 367 | asm("ldy #$0c"); |
| 368 | asm("clc"); |
| 369 | asm("php"); |
| 370 | asm("tcpchksum_loop2:"); |
| 371 | asm("plp"); |
| 372 | asm("lda _uip_buf+%b,y", UIP_LLH_LEN); |
| 373 | asm("adc _chksum_tmp"); |
| 374 | asm("sta _chksum_tmp"); |
| 375 | asm("iny"); |
| 376 | asm("lda _uip_buf+%b,y", UIP_LLH_LEN); |
adamdunkels | 70c4c34 | 2003-04-24 17:01:17 +0000 | [diff] [blame] | 377 | asm("adc _chksum_tmp+1"); |
| 378 | asm("sta _chksum_tmp+1"); |
| 379 | asm("iny"); |
| 380 | asm("php"); |
| 381 | asm("cpy #$14"); |
| 382 | asm("bne tcpchksum_loop2"); |
| 383 | |
| 384 | asm("plp"); |
| 385 | |
| 386 | asm("lda _chksum_tmp"); |
| 387 | asm("adc #0"); |
| 388 | asm("sta _chksum_tmp"); |
| 389 | asm("lda _chksum_tmp+1"); |
| 390 | asm("adc #6"); /* IP_PROTO_TCP */ |
| 391 | asm("sta _chksum_tmp+1"); |
| 392 | |
| 393 | |
| 394 | asm("lda _chksum_tmp"); |
| 395 | asm("adc _chksum_len+1"); |
| 396 | asm("sta _chksum_tmp"); |
| 397 | asm("lda _chksum_tmp+1"); |
| 398 | asm("adc _chksum_len"); |
| 399 | asm("sta _chksum_tmp+1"); |
| 400 | |
| 401 | |
| 402 | |
| 403 | asm("tcpchksum_loop3:"); |
| 404 | asm("lda _chksum_tmp"); |
| 405 | asm("adc #0"); |
| 406 | asm("sta _chksum_tmp"); |
| 407 | asm("lda _chksum_tmp+1"); |
| 408 | asm("adc #0"); |
| 409 | asm("sta _chksum_tmp+1"); |
| 410 | asm("bcs tcpchksum_loop3"); |
| 411 | |
| 412 | |
| 413 | return chksum_tmp; |
adamdunkels | 6968dcb | 2004-09-19 19:01:12 +0000 | [diff] [blame] | 414 | #endif |
adamdunkels | 70c4c34 | 2003-04-24 17:01:17 +0000 | [diff] [blame] | 415 | } |
adamdunkels | 6968dcb | 2004-09-19 19:01:12 +0000 | [diff] [blame] | 416 | |
| 417 | /*-----------------------------------------------------------------------------------*/ |
| 418 | #if UIP_UDP_CHECKSUMS |
| 419 | u16_t |
| 420 | uip_udpchksum(void) |
| 421 | { |
| 422 | return transport_chksum(IP_PROTO_UDP); |
| 423 | #if 0 |
| 424 | chksum_ptr = (u16_t)&uip_buf[20 + UIP_LLH_LEN]; |
| 425 | chksum_len = 20; |
| 426 | chksum_tmp = chksum(); |
| 427 | |
| 428 | chksum_ptr = (u16_t)uip_appdata; |
| 429 | asm("lda _uip_buf+3+%b", UIP_LLH_LEN); |
| 430 | asm("sec"); |
| 431 | asm("sbc #40"); |
| 432 | asm("sta _chksum_len"); |
| 433 | asm("lda _uip_buf+2+%b", UIP_LLH_LEN); |
| 434 | asm("sbc #0"); |
| 435 | asm("sta _chksum_len+1"); |
| 436 | |
| 437 | asm("jsr %v", chksum); |
| 438 | |
| 439 | asm("clc"); |
| 440 | asm("adc _chksum_tmp"); |
| 441 | asm("sta _chksum_tmp"); |
| 442 | asm("txa"); |
| 443 | asm("adc _chksum_tmp+1"); |
| 444 | asm("sta _chksum_tmp+1"); |
| 445 | |
| 446 | /* Fold carry */ |
| 447 | /* asm("bcc noinc"); |
| 448 | asm("inc _chksum_tmp"); |
| 449 | asm("noinc:");*/ |
| 450 | |
| 451 | asm("tcpchksum_loop1:"); |
| 452 | asm("lda _chksum_tmp"); |
| 453 | asm("adc #0"); |
| 454 | asm("sta _chksum_tmp"); |
| 455 | asm("lda _chksum_tmp+1"); |
| 456 | asm("adc #0"); |
| 457 | asm("sta _chksum_tmp+1"); |
| 458 | asm("bcs tcpchksum_loop1"); |
| 459 | |
| 460 | |
| 461 | asm("lda _uip_buf+3+%b", UIP_LLH_LEN); |
| 462 | asm("sec"); |
| 463 | asm("sbc #20"); |
| 464 | asm("sta _chksum_len"); |
| 465 | asm("lda _uip_buf+2+%b", UIP_LLH_LEN); |
| 466 | asm("sbc #0"); |
| 467 | asm("sta _chksum_len+1"); |
| 468 | |
| 469 | |
| 470 | asm("ldy #$0c"); |
| 471 | asm("clc"); |
| 472 | asm("php"); |
| 473 | asm("tcpchksum_loop2:"); |
| 474 | asm("plp"); |
| 475 | asm("lda _uip_buf+%b,y", UIP_LLH_LEN); |
| 476 | asm("adc _chksum_tmp"); |
| 477 | asm("sta _chksum_tmp"); |
| 478 | asm("iny"); |
| 479 | asm("lda _uip_buf+%b,y", UIP_LLH_LEN); |
| 480 | asm("adc _chksum_tmp+1"); |
| 481 | asm("sta _chksum_tmp+1"); |
| 482 | asm("iny"); |
| 483 | asm("php"); |
| 484 | asm("cpy #$14"); |
| 485 | asm("bne tcpchksum_loop2"); |
| 486 | |
| 487 | asm("plp"); |
| 488 | |
| 489 | asm("lda _chksum_tmp"); |
| 490 | asm("adc #0"); |
| 491 | asm("sta _chksum_tmp"); |
| 492 | asm("lda _chksum_tmp+1"); |
| 493 | asm("adc #17"); /* IP_PROTO_UDP */ |
| 494 | asm("sta _chksum_tmp+1"); |
| 495 | |
| 496 | |
| 497 | asm("lda _chksum_tmp"); |
| 498 | asm("adc _chksum_len+1"); |
| 499 | asm("sta _chksum_tmp"); |
| 500 | asm("lda _chksum_tmp+1"); |
| 501 | asm("adc _chksum_len"); |
| 502 | asm("sta _chksum_tmp+1"); |
| 503 | |
| 504 | |
| 505 | |
| 506 | asm("tcpchksum_loop3:"); |
| 507 | asm("lda _chksum_tmp"); |
| 508 | asm("adc #0"); |
| 509 | asm("sta _chksum_tmp"); |
| 510 | asm("lda _chksum_tmp+1"); |
| 511 | asm("adc #0"); |
| 512 | asm("sta _chksum_tmp+1"); |
| 513 | asm("bcs tcpchksum_loop3"); |
| 514 | |
| 515 | |
| 516 | return chksum_tmp; |
| 517 | #endif |
| 518 | } |
| 519 | #endif /* UIP_UDP_CHECKSUMS */ |
adamdunkels | 70c4c34 | 2003-04-24 17:01:17 +0000 | [diff] [blame] | 520 | /*-----------------------------------------------------------------------------------*/ |