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contiki/cpu/6502/net/uip_arch.c

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/*
* Copyright (c) 2001, Adam Dunkels.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote
* products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* This file is part of the uIP TCP/IP stack.
*
* $Id: uip_arch.c,v 1.1 2006/06/17 22:41:21 adamdunkels Exp $
*
*/
#include "net/uip.h"
#include "net/uip_arch.h"
#define BUF ((uip_tcpip_hdr *)&uip_buf[UIP_LLH_LEN])
#define IP_PROTO_TCP 6
#define IP_PROTO_UDP 17
/*-----------------------------------------------------------------------------------*/
#pragma optimize(push, off)
void
uip_add32(u8_t *op32, u16_t op16)
{
asm("ldy #3");
asm("jsr ldaxysp");
asm("sta ptr1");
asm("stx ptr1+1");
asm("ldy #0");
asm("lda (sp),y");
asm("ldy #3");
asm("clc");
asm("adc (ptr1),y");
asm("sta _uip_acc32+3");
asm("dey");
asm("lda (ptr1),y");
asm("ldy #1");
asm("adc (sp),y");
asm("sta _uip_acc32+2");
asm("ldy #1");
asm("lda (ptr1),y");
asm("adc #0");
asm("sta _uip_acc32+1");
asm("dey");
asm("lda (ptr1),y");
asm("adc #0");
asm("sta _uip_acc32+0");
}
#pragma optimize(pop)
/*-----------------------------------------------------------------------------------*/
static u16_t chksum_ptr, chksum_len, chksum_tmp;
static u8_t chksum_protocol;
static u16_t chksum(void);
/*-----------------------------------------------------------------------------------*/
#pragma optimize(push, off)
u16_t
chksum(void) {
asm("lda #0");
asm("sta tmp1");
asm("sta tmp1+1");
asm("lda _chksum_ptr");
asm("sta ptr1");
asm("lda _chksum_ptr+1");
asm("sta ptr1+1");
asm("lda _chksum_len+1");
asm("beq chksumlast");
/* If checksum is > 256, do the first runs. */
asm("ldy #0");
asm("clc");
asm("chksumloop_256:");
asm("lda (ptr1),y");
asm("adc tmp1");
asm("sta tmp1");
asm("iny");
asm("lda (ptr1),y");
asm("adc tmp1+1");
asm("sta tmp1+1");
asm("iny");
asm("bne chksumloop_256");
asm("inc ptr1+1");
asm("dec _chksum_len+1");
asm("bne chksumloop_256");
asm("chksum_endloop_256:");
asm("lda tmp1");
asm("adc #0");
asm("sta tmp1");
asm("lda tmp1+1");
asm("adc #0");
asm("sta tmp1+1");
asm("bcs chksum_endloop_256");
asm("chksumlast:");
asm("lda _chksum_len");
asm("lsr");
asm("bcc chksum_noodd");
asm("ldy _chksum_len");
asm("dey");
asm("lda (ptr1),y");
asm("clc");
asm("adc tmp1");
asm("sta tmp1");
asm("bcc noinc1");
asm("inc tmp1+1");
asm("bne noinc1");
asm("inc tmp1");
asm("noinc1:");
asm("dec _chksum_len");
asm("chksum_noodd:");
asm("clc");
asm("php");
asm("ldy _chksum_len");
asm("chksum_loop1:");
asm("cpy #0");
asm("beq chksum_loop1_end");
asm("plp");
asm("dey");
asm("dey");
asm("lda (ptr1),y");
asm("adc tmp1");
asm("sta tmp1");
asm("iny");
asm("lda (ptr1),y");
asm("adc tmp1+1");
asm("sta tmp1+1");
asm("dey");
asm("php");
asm("jmp chksum_loop1");
asm("chksum_loop1_end:");
asm("plp");
asm("chksum_endloop:");
asm("lda tmp1");
asm("adc #0");
asm("sta tmp1");
asm("lda tmp1+1");
asm("adc #0");
asm("sta tmp1+1");
asm("bcs chksum_endloop");
asm("lda tmp1");
asm("ldx tmp1+1");
}
#pragma optimize(pop)
/*-----------------------------------------------------------------------------------*/
u16_t
uip_chksum(u16_t *buf, u16_t len)
{
/* unsigned long sum;
sum = 0;
chksum_ptr = (u16_t)buf;
while(len >= 256) {
chksum_len = 256;
sum += chksum();
len -= 256;
chksum_ptr += 256;
}
if(len < 256) {
chksum_len = len;
sum += chksum();
}
while((sum >> 16) != 0) {
sum = (sum >> 16) + (sum & 0xffff);
}
return sum;*/
chksum_len = len;
chksum_ptr = (u16_t)buf;
return chksum();
}
/*-----------------------------------------------------------------------------------*/
u16_t
uip_ipchksum(void)
{
chksum_ptr = (u16_t)uip_buf + UIP_LLH_LEN;
chksum_len = UIP_IPH_LEN;
return chksum();
}
/*-----------------------------------------------------------------------------------*/
#pragma optimize(push, off)
static u16_t
transport_chksum(u8_t protocol)
{
chksum_protocol = protocol;
chksum_ptr = (u16_t)&uip_buf[UIP_LLH_LEN + UIP_IPH_LEN];
chksum_len = UIP_TCPH_LEN;
chksum_tmp = chksum();
chksum_ptr = (u16_t)uip_appdata;
asm("lda _uip_buf+3+%b", UIP_LLH_LEN);
asm("sec");
asm("sbc #%b", UIP_IPTCPH_LEN);
asm("sta _chksum_len");
asm("lda _uip_buf+2+%b", UIP_LLH_LEN);
asm("sbc #0");
asm("sta _chksum_len+1");
asm("jsr %v", chksum);
asm("clc");
asm("adc _chksum_tmp");
asm("sta _chksum_tmp");
asm("txa");
asm("adc _chksum_tmp+1");
asm("sta _chksum_tmp+1");
/* Fold carry */
/* asm("bcc noinc");
asm("inc _chksum_tmp");
asm("noinc:");*/
asm("tcpchksum_loop1:");
asm("lda _chksum_tmp");
asm("adc #0");
asm("sta _chksum_tmp");
asm("lda _chksum_tmp+1");
asm("adc #0");
asm("sta _chksum_tmp+1");
asm("bcs tcpchksum_loop1");
asm("lda _uip_buf+3+%b", UIP_LLH_LEN);
asm("sec");
asm("sbc #%b", UIP_IPH_LEN);
asm("sta _chksum_len");
asm("lda _uip_buf+2+%b", UIP_LLH_LEN);
asm("sbc #0");
asm("sta _chksum_len+1");
asm("ldy #$0c");
asm("clc");
asm("php");
asm("tcpchksum_loop2:");
asm("plp");
asm("lda _uip_buf+%b,y", UIP_LLH_LEN);
asm("adc _chksum_tmp");
asm("sta _chksum_tmp");
asm("iny");
asm("lda _uip_buf+%b,y", UIP_LLH_LEN);
asm("adc _chksum_tmp+1");
asm("sta _chksum_tmp+1");
asm("iny");
asm("php");
asm("cpy #$14");
asm("bne tcpchksum_loop2");
asm("plp");
asm("lda _chksum_tmp");
asm("adc #0");
asm("sta _chksum_tmp");
asm("lda _chksum_tmp+1");
asm("adc %v", chksum_protocol);
asm("sta _chksum_tmp+1");
asm("lda _chksum_tmp");
asm("adc _chksum_len+1");
asm("sta _chksum_tmp");
asm("lda _chksum_tmp+1");
asm("adc _chksum_len");
asm("sta _chksum_tmp+1");
asm("tcpchksum_loop3:");
asm("lda _chksum_tmp");
asm("adc #0");
asm("sta _chksum_tmp");
asm("lda _chksum_tmp+1");
asm("adc #0");
asm("sta _chksum_tmp+1");
asm("bcs tcpchksum_loop3");
return chksum_tmp;
}
#pragma optimize(pop)
/*-----------------------------------------------------------------------------------*/
u16_t
uip_tcpchksum(void)
{
return transport_chksum(IP_PROTO_TCP);
#if 0
chksum_ptr = (u16_t)&uip_buf[UIP_LLH_LEN + UIP_IPH_LEN];
chksum_len = UIP_TCPH_LEN;
chksum_tmp = chksum();
chksum_ptr = (u16_t)uip_appdata;
asm("lda _uip_buf+3+%b", UIP_LLH_LEN);
asm("sec");
asm("sbc #%b", UIP_IPTCPH_LEN);
asm("sta _chksum_len");
asm("lda _uip_buf+2+%b", UIP_LLH_LEN);
asm("sbc #0");
asm("sta _chksum_len+1");
asm("jsr %v", chksum);
asm("clc");
asm("adc _chksum_tmp");
asm("sta _chksum_tmp");
asm("txa");
asm("adc _chksum_tmp+1");
asm("sta _chksum_tmp+1");
/* Fold carry */
/* asm("bcc noinc");
asm("inc _chksum_tmp");
asm("noinc:");*/
asm("tcpchksum_loop1:");
asm("lda _chksum_tmp");
asm("adc #0");
asm("sta _chksum_tmp");
asm("lda _chksum_tmp+1");
asm("adc #0");
asm("sta _chksum_tmp+1");
asm("bcs tcpchksum_loop1");
asm("lda _uip_buf+3+%b", UIP_LLH_LEN);
asm("sec");
asm("sbc #%b", UIP_IPH_LEN);
asm("sta _chksum_len");
asm("lda _uip_buf+2+%b", UIP_LLH_LEN);
asm("sbc #0");
asm("sta _chksum_len+1");
asm("ldy #$0c");
asm("clc");
asm("php");
asm("tcpchksum_loop2:");
asm("plp");
asm("lda _uip_buf+%b,y", UIP_LLH_LEN);
asm("adc _chksum_tmp");
asm("sta _chksum_tmp");
asm("iny");
asm("lda _uip_buf+%b,y", UIP_LLH_LEN);
asm("adc _chksum_tmp+1");
asm("sta _chksum_tmp+1");
asm("iny");
asm("php");
asm("cpy #$14");
asm("bne tcpchksum_loop2");
asm("plp");
asm("lda _chksum_tmp");
asm("adc #0");
asm("sta _chksum_tmp");
asm("lda _chksum_tmp+1");
asm("adc #6"); /* IP_PROTO_TCP */
asm("sta _chksum_tmp+1");
asm("lda _chksum_tmp");
asm("adc _chksum_len+1");
asm("sta _chksum_tmp");
asm("lda _chksum_tmp+1");
asm("adc _chksum_len");
asm("sta _chksum_tmp+1");
asm("tcpchksum_loop3:");
asm("lda _chksum_tmp");
asm("adc #0");
asm("sta _chksum_tmp");
asm("lda _chksum_tmp+1");
asm("adc #0");
asm("sta _chksum_tmp+1");
asm("bcs tcpchksum_loop3");
return chksum_tmp;
#endif
}
/*-----------------------------------------------------------------------------------*/
#if UIP_UDP_CHECKSUMS
u16_t
uip_udpchksum(void)
{
return transport_chksum(IP_PROTO_UDP);
#if 0
chksum_ptr = (u16_t)&uip_buf[20 + UIP_LLH_LEN];
chksum_len = 20;
chksum_tmp = chksum();
chksum_ptr = (u16_t)uip_appdata;
asm("lda _uip_buf+3+%b", UIP_LLH_LEN);
asm("sec");
asm("sbc #40");
asm("sta _chksum_len");
asm("lda _uip_buf+2+%b", UIP_LLH_LEN);
asm("sbc #0");
asm("sta _chksum_len+1");
asm("jsr %v", chksum);
asm("clc");
asm("adc _chksum_tmp");
asm("sta _chksum_tmp");
asm("txa");
asm("adc _chksum_tmp+1");
asm("sta _chksum_tmp+1");
/* Fold carry */
/* asm("bcc noinc");
asm("inc _chksum_tmp");
asm("noinc:");*/
asm("tcpchksum_loop1:");
asm("lda _chksum_tmp");
asm("adc #0");
asm("sta _chksum_tmp");
asm("lda _chksum_tmp+1");
asm("adc #0");
asm("sta _chksum_tmp+1");
asm("bcs tcpchksum_loop1");
asm("lda _uip_buf+3+%b", UIP_LLH_LEN);
asm("sec");
asm("sbc #20");
asm("sta _chksum_len");
asm("lda _uip_buf+2+%b", UIP_LLH_LEN);
asm("sbc #0");
asm("sta _chksum_len+1");
asm("ldy #$0c");
asm("clc");
asm("php");
asm("tcpchksum_loop2:");
asm("plp");
asm("lda _uip_buf+%b,y", UIP_LLH_LEN);
asm("adc _chksum_tmp");
asm("sta _chksum_tmp");
asm("iny");
asm("lda _uip_buf+%b,y", UIP_LLH_LEN);
asm("adc _chksum_tmp+1");
asm("sta _chksum_tmp+1");
asm("iny");
asm("php");
asm("cpy #$14");
asm("bne tcpchksum_loop2");
asm("plp");
asm("lda _chksum_tmp");
asm("adc #0");
asm("sta _chksum_tmp");
asm("lda _chksum_tmp+1");
asm("adc #17"); /* IP_PROTO_UDP */
asm("sta _chksum_tmp+1");
asm("lda _chksum_tmp");
asm("adc _chksum_len+1");
asm("sta _chksum_tmp");
asm("lda _chksum_tmp+1");
asm("adc _chksum_len");
asm("sta _chksum_tmp+1");
asm("tcpchksum_loop3:");
asm("lda _chksum_tmp");
asm("adc #0");
asm("sta _chksum_tmp");
asm("lda _chksum_tmp+1");
asm("adc #0");
asm("sta _chksum_tmp+1");
asm("bcs tcpchksum_loop3");
return chksum_tmp;
#endif
}
#endif /* UIP_UDP_CHECKSUMS */
/*-----------------------------------------------------------------------------------*/
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