| /* |
| * Copyright (c) 2004, 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. Neither the name of the Institute nor the names of its contributors |
| * may be used to endorse or promote products derived from this software |
| * without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``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 INSTITUTE OR CONTRIBUTORS 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 Contiki operating system. |
| * |
| * Author: Adam Dunkels <adam@sics.se> |
| * |
| * $Id: mtarch.c,v 1.2 2004/09/12 20:30:03 adamdunkels Exp $ |
| */ |
| #include "mtarch.h" |
| #include <string.h> |
| |
| unsigned char mtarch_asm_threadspreg; |
| unsigned char *mtarch_asm_threadsp; |
| unsigned char *mtarch_asm_threadzp; |
| unsigned char *mtarch_asm_threadstack; |
| |
| void mtarch_asm_start(void); |
| void mtarch_asm_exec(void); |
| |
| |
| /*--------------------------------------------------------------------------*/ |
| void |
| mtarch_start(struct mtarch_thread *thread, |
| void (* function)(void *data), |
| void *data) |
| { |
| memset(thread->cpustack, 0, sizeof(thread->cpustack)); |
| memset(thread->cstack, 0, sizeof(thread->cstack)); |
| |
| /* Create a CPU stack frame with the appropriate values... */ |
| thread->cpustack[MTARCH_CPUSTACKSIZE - 2] = ((unsigned short)function) >> 8; /* high byte of return address. */ |
| thread->cpustack[MTARCH_CPUSTACKSIZE - 3] = ((unsigned short)function) & 0xff; /* low byte of return address. */ |
| thread->cpustack[MTARCH_CPUSTACKSIZE - 4] = 0x21; /* processor flags. */ |
| thread->cpustack[MTARCH_CPUSTACKSIZE - 5] = /* a register */ |
| thread->cpustack[MTARCH_CPUSTACKSIZE - 6] = /* x register */ |
| thread->cpustack[MTARCH_CPUSTACKSIZE - 7] = 0; /* y register */ |
| thread->spreg = MTARCH_CPUSTACKSIZE - 8; |
| |
| /* Setup the C stack with the data pointer. */ |
| thread->sp = &thread->cstack[MTARCH_CSTACKSIZE - 1]; |
| |
| mtarch_asm_threadzp = &(thread->zp); |
| mtarch_asm_start(); |
| } |
| /*--------------------------------------------------------------------------*/ |
| void |
| mtarch_exec(struct mtarch_thread *thread) |
| { |
| /* Switch processor stack. The call to mtarch_asm_switch() will not |
| return until the process that we switch to calls yield(). */ |
| mtarch_asm_threadspreg = thread->spreg; |
| mtarch_asm_threadsp = thread->sp; |
| |
| mtarch_asm_threadstack = &(thread->cpustack[0]); |
| mtarch_asm_threadzp = &(thread->zp[0]); |
| |
| mtarch_asm_exec(); |
| |
| thread->sp = mtarch_asm_threadsp; |
| thread->spreg = mtarch_asm_threadspreg; |
| } |
| /*--------------------------------------------------------------------------*/ |
| void |
| mtarch_init(void) { |
| |
| } |
| /*--------------------------------------------------------------------------*/ |
| void |
| mtarch_remove(void) |
| { |
| |
| } |