124 lines
4.6 KiB
C
124 lines
4.6 KiB
C
/*
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* Copyright (c) 2004, Adam Dunkels.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the Contiki operating system.
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*
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* Author: Adam Dunkels <adam@sics.se>
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*
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*/
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#include <string.h>
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#include "sys/mtarch.h"
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unsigned char mtarch_asm_threadspreg;
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unsigned char *mtarch_asm_threadzp;
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unsigned char *mtarch_asm_threadstack;
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void mtarch_asm_start(void);
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void mtarch_asm_yield(void);
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void mtarch_asm_exec(void);
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/*--------------------------------------------------------------------------*/
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void
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mtarch_init(void)
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{
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}
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/*--------------------------------------------------------------------------*/
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void
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mtarch_remove(void)
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{
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}
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/*--------------------------------------------------------------------------*/
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void
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mtarch_start(struct mtarch_thread *thread,
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void (* function)(void *data),
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void *data)
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{
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memset(thread->cpustack, 0, sizeof(thread->cpustack));
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memset(thread->cstack, 0, sizeof(thread->cstack));
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/* Copy current zero page content as template. */
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mtarch_asm_threadzp = thread->zp;
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mtarch_asm_start();
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/* Create a CPU stack frame with the appropriate values. */
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thread->cpustack[MTARCH_CPUSTACKSIZE - 2] = ((unsigned short)function) / 0x100; /* high byte of return address */
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thread->cpustack[MTARCH_CPUSTACKSIZE - 3] = ((unsigned short)function) % 0x100; /* low byte of return address */
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thread->cpustack[MTARCH_CPUSTACKSIZE - 4] = 0x21; /* processor flags */
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thread->cpustack[MTARCH_CPUSTACKSIZE - 5] = /* a register */
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thread->cpustack[MTARCH_CPUSTACKSIZE - 6] = /* x register */
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thread->cpustack[MTARCH_CPUSTACKSIZE - 7] = 0x00; /* y register */
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thread->spreg = MTARCH_CPUSTACKSIZE - 8;
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/* Setup the C stack with the data pointer. */
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thread->cstack[MTARCH_CSTACKSIZE - 2] = ((unsigned short)data) / 0x100; /* high byte of data pointer */
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thread->cstack[MTARCH_CSTACKSIZE - 3] = ((unsigned short)data) % 0x100; /* low byte of data pointer */
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/* Setup the C stack pointer. */
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thread->zp[1] = ((size_t)&thread->cstack[MTARCH_CSTACKSIZE - 3]) / 0x100; /* high byte of C stack pointer */
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thread->zp[0] = ((size_t)&thread->cstack[MTARCH_CSTACKSIZE - 3]) % 0x100; /* low byte of C stack pointer */
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}
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/*--------------------------------------------------------------------------*/
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void
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mtarch_yield(void)
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{
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mtarch_asm_yield();
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}
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/*--------------------------------------------------------------------------*/
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void
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mtarch_exec(struct mtarch_thread *thread)
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{
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/* Switch processor stack. The call to mtarch_asm_switch() will not
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return until the process that we switch to calls yield(). */
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mtarch_asm_threadspreg = thread->spreg;
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mtarch_asm_threadstack = thread->cpustack;
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mtarch_asm_threadzp = thread->zp;
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mtarch_asm_exec();
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thread->spreg = mtarch_asm_threadspreg;
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}
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/*--------------------------------------------------------------------------*/
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void
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mtarch_stop(struct mtarch_thread *thread)
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{
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}
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/*--------------------------------------------------------------------------*/
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void
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mtarch_pstart(void)
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{
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}
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/*--------------------------------------------------------------------------*/
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void
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mtarch_pstop(void)
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{
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}
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/*--------------------------------------------------------------------------*/
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