kthacker | 62e146c | 2006-04-17 15:11:35 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2004, 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. |
| 13 | * 3. Neither the name of the Institute nor the names of its contributors |
| 14 | * may be used to endorse or promote products derived from this software |
| 15 | * without specific prior written permission. |
| 16 | * |
| 17 | * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND |
| 18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE |
| 21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 27 | * SUCH DAMAGE. |
| 28 | * |
| 29 | * This file is part of the Contiki operating system. |
| 30 | * |
| 31 | * Author: Adam Dunkels <adam@sics.se> |
| 32 | * |
| 33 | * $Id: mtarch.c,v 1.1 2006/04/17 15:11:55 kthacker Exp $ |
| 34 | */ |
| 35 | #include "mtarch.h" |
| 36 | #include <string.h> |
| 37 | |
| 38 | unsigned char mtarch_asm_threadspreg; |
| 39 | unsigned char *mtarch_asm_threadsp; |
| 40 | unsigned char *mtarch_asm_threadzp; |
| 41 | unsigned char *mtarch_asm_threadstack; |
| 42 | |
| 43 | void mtarch_asm_start(void); |
| 44 | void mtarch_asm_exec(void); |
| 45 | |
| 46 | |
| 47 | /*--------------------------------------------------------------------------*/ |
| 48 | void |
| 49 | mtarch_start(struct mtarch_thread *thread, |
| 50 | void (* function)(void *data), |
| 51 | void *data) |
| 52 | { |
| 53 | memset(thread->cpustack, 0, sizeof(thread->cpustack)); |
| 54 | memset(thread->cstack, 0, sizeof(thread->cstack)); |
| 55 | |
| 56 | /* Create a CPU stack frame with the appropriate values... */ |
| 57 | thread->cpustack[MTARCH_CPUSTACKSIZE - 2] = ((unsigned short)function) >> 8; /* high byte of return address. */ |
| 58 | thread->cpustack[MTARCH_CPUSTACKSIZE - 3] = ((unsigned short)function) & 0xff; /* low byte of return address. */ |
| 59 | thread->cpustack[MTARCH_CPUSTACKSIZE - 4] = 0x21; /* processor flags. */ |
| 60 | thread->cpustack[MTARCH_CPUSTACKSIZE - 5] = /* a register */ |
| 61 | thread->cpustack[MTARCH_CPUSTACKSIZE - 6] = /* x register */ |
| 62 | thread->cpustack[MTARCH_CPUSTACKSIZE - 7] = 0; /* y register */ |
| 63 | thread->spreg = MTARCH_CPUSTACKSIZE - 8; |
| 64 | |
| 65 | /* Setup the C stack with the data pointer. */ |
| 66 | thread->sp = &thread->cstack[MTARCH_CSTACKSIZE - 1]; |
| 67 | |
| 68 | mtarch_asm_threadzp = &(thread->zp); |
| 69 | mtarch_asm_start(); |
| 70 | } |
| 71 | /*--------------------------------------------------------------------------*/ |
| 72 | void |
| 73 | mtarch_exec(struct mtarch_thread *thread) |
| 74 | { |
| 75 | /* Switch processor stack. The call to mtarch_asm_switch() will not |
| 76 | return until the process that we switch to calls yield(). */ |
| 77 | mtarch_asm_threadspreg = thread->spreg; |
| 78 | mtarch_asm_threadsp = thread->sp; |
| 79 | |
| 80 | mtarch_asm_threadstack = &(thread->cpustack[0]); |
| 81 | mtarch_asm_threadzp = &(thread->zp[0]); |
| 82 | |
| 83 | mtarch_asm_exec(); |
| 84 | |
| 85 | thread->sp = mtarch_asm_threadsp; |
| 86 | thread->spreg = mtarch_asm_threadspreg; |
| 87 | } |
| 88 | /*--------------------------------------------------------------------------*/ |
| 89 | void |
| 90 | mtarch_init(void) { |
| 91 | |
| 92 | } |
| 93 | /*--------------------------------------------------------------------------*/ |
| 94 | void |
| 95 | mtarch_remove(void) |
| 96 | { |
| 97 | |
| 98 | } |