Russ Butler / mbed-rtos-legacy

Maintain legacy RTOS behavior before mbed-5

Fork of mbed-rtos by mbed official

rtx/TARGET_ARM7/HAL_CM.c@123:58563e6cba1e, 2016-11-14 (annotated)

Committer:
c1728p9
Date:
Mon Nov 14 17:14:42 2016 -0600
Revision:
123:58563e6cba1e
Parent:
80:2dab120a94c2 
Configure RTOS to behave as it did before 5.0

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 80:2dab120a94c2 1 /*----------------------------------------------------------------------------
mbed_official 80:2dab120a94c2 2 * RL-ARM - RTX
mbed_official 80:2dab120a94c2 3 *----------------------------------------------------------------------------
mbed_official 80:2dab120a94c2 4 * Name: HAL_CM.C
mbed_official 80:2dab120a94c2 5 * Purpose: Hardware Abstraction Layer for ARM7TDMI
mbed_official 80:2dab120a94c2 6 * Rev.: V1.0
mbed_official 80:2dab120a94c2 7 *----------------------------------------------------------------------------
mbed_official 80:2dab120a94c2 8 *
mbed_official 80:2dab120a94c2 9 * Copyright (c) 1999-2009 KEIL, 2009-2015 ARM Germany GmbH
mbed_official 80:2dab120a94c2 10 * All rights reserved.
mbed_official 80:2dab120a94c2 11 * Redistribution and use in source and binary forms, with or without
mbed_official 80:2dab120a94c2 12 * modification, are permitted provided that the following conditions are met:
mbed_official 80:2dab120a94c2 13 * - Redistributions of source code must retain the above copyright
mbed_official 80:2dab120a94c2 14 * notice, this list of conditions and the following disclaimer.
mbed_official 80:2dab120a94c2 15 * - Redistributions in binary form must reproduce the above copyright
mbed_official 80:2dab120a94c2 16 * notice, this list of conditions and the following disclaimer in the
mbed_official 80:2dab120a94c2 17 * documentation and/or other materials provided with the distribution.
mbed_official 80:2dab120a94c2 18 * - Neither the name of ARM nor the names of its contributors may be used
mbed_official 80:2dab120a94c2 19 * to endorse or promote products derived from this software without
mbed_official 80:2dab120a94c2 20 * specific prior written permission.
mbed_official 80:2dab120a94c2 21 *
mbed_official 80:2dab120a94c2 22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 80:2dab120a94c2 23 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 80:2dab120a94c2 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
mbed_official 80:2dab120a94c2 25 * ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDERS AND CONTRIBUTORS BE
mbed_official 80:2dab120a94c2 26 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
mbed_official 80:2dab120a94c2 27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
mbed_official 80:2dab120a94c2 28 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
mbed_official 80:2dab120a94c2 29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
mbed_official 80:2dab120a94c2 30 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
mbed_official 80:2dab120a94c2 31 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
mbed_official 80:2dab120a94c2 32 * POSSIBILITY OF SUCH DAMAGE.
mbed_official 80:2dab120a94c2 33 *---------------------------------------------------------------------------*/
mbed_official 80:2dab120a94c2 34
mbed_official 80:2dab120a94c2 35 #include "rt_TypeDef.h"
mbed_official 80:2dab120a94c2 36 #include "RTX_Conf.h"
mbed_official 80:2dab120a94c2 37 #include "rt_HAL_CM.h"
mbed_official 80:2dab120a94c2 38
mbed_official 80:2dab120a94c2 39
mbed_official 80:2dab120a94c2 40 /*----------------------------------------------------------------------------
mbed_official 80:2dab120a94c2 41 * Global Variables
mbed_official 80:2dab120a94c2 42 *---------------------------------------------------------------------------*/
mbed_official 80:2dab120a94c2 43
mbed_official 80:2dab120a94c2 44 #ifdef DBG_MSG
mbed_official 80:2dab120a94c2 45 BIT dbg_msg;
mbed_official 80:2dab120a94c2 46 #endif
mbed_official 80:2dab120a94c2 47
mbed_official 80:2dab120a94c2 48 /*----------------------------------------------------------------------------
mbed_official 80:2dab120a94c2 49 * Functions
mbed_official 80:2dab120a94c2 50 *---------------------------------------------------------------------------*/
mbed_official 80:2dab120a94c2 51
mbed_official 80:2dab120a94c2 52
mbed_official 80:2dab120a94c2 53 /*--------------------------- rt_init_stack ---------------------------------*/
mbed_official 80:2dab120a94c2 54
mbed_official 80:2dab120a94c2 55 void rt_init_stack (P_TCB p_TCB, FUNCP task_body) {
mbed_official 80:2dab120a94c2 56 /* Prepare TCB and saved context for a first time start of a task. */
mbed_official 80:2dab120a94c2 57 U32 *stk,i,size;
mbed_official 80:2dab120a94c2 58
mbed_official 80:2dab120a94c2 59 /* Prepare a complete interrupt frame for first task start */
mbed_official 80:2dab120a94c2 60 size = p_TCB->priv_stack >> 2;
mbed_official 80:2dab120a94c2 61
mbed_official 80:2dab120a94c2 62 /* Write to the top of stack. */
mbed_official 80:2dab120a94c2 63 stk = &p_TCB->stack[size];
mbed_official 80:2dab120a94c2 64
mbed_official 80:2dab120a94c2 65 /* Auto correct to 8-byte ARM stack alignment. */
mbed_official 80:2dab120a94c2 66 if ((U32)stk & 0x04) {
mbed_official 80:2dab120a94c2 67 stk--;
mbed_official 80:2dab120a94c2 68 }
mbed_official 80:2dab120a94c2 69
mbed_official 80:2dab120a94c2 70 stk -= 16;
mbed_official 80:2dab120a94c2 71
mbed_official 80:2dab120a94c2 72 /* Default xPSR and initial PC */
mbed_official 80:2dab120a94c2 73 stk[15] = (U32)task_body + 4; /* add 4 byte offset because SUB PC, LR - 4 */
mbed_official 80:2dab120a94c2 74 stk[0] = INITIAL_xPSR;
mbed_official 80:2dab120a94c2 75
mbed_official 80:2dab120a94c2 76 /* Clear R0-R13/LR registers. */
mbed_official 80:2dab120a94c2 77 for (i = 1; i < 14; i++) {
mbed_official 80:2dab120a94c2 78 stk[i] = 0;
mbed_official 80:2dab120a94c2 79 }
mbed_official 80:2dab120a94c2 80
mbed_official 80:2dab120a94c2 81 /* Assign a void pointer to R0. */
mbed_official 80:2dab120a94c2 82 stk[TCB_STACK_R0_OFFSET_DWORDS] = (U32)p_TCB->msg;
mbed_official 80:2dab120a94c2 83
mbed_official 80:2dab120a94c2 84 /* Initial Task stack pointer. */
mbed_official 80:2dab120a94c2 85 p_TCB->tsk_stack = (U32)stk;
mbed_official 80:2dab120a94c2 86
mbed_official 80:2dab120a94c2 87 /* Task entry point. */
mbed_official 80:2dab120a94c2 88 p_TCB->ptask = task_body;
mbed_official 80:2dab120a94c2 89
mbed_official 80:2dab120a94c2 90 /* Set a magic word for checking of stack overflow.
mbed_official 80:2dab120a94c2 91 For the main thread (ID: 0x01) the stack is in a memory area shared with the
mbed_official 80:2dab120a94c2 92 heap, therefore the last word of the stack is a moving target.
mbed_official 80:2dab120a94c2 93 We want to do stack/heap collision detection instead.
mbed_official 80:2dab120a94c2 94 */
mbed_official 80:2dab120a94c2 95 if (p_TCB->task_id != 0x01)
mbed_official 80:2dab120a94c2 96 p_TCB->stack[0] = MAGIC_WORD;
mbed_official 80:2dab120a94c2 97 }
mbed_official 80:2dab120a94c2 98
mbed_official 80:2dab120a94c2 99
mbed_official 80:2dab120a94c2 100 /*--------------------------- rt_ret_val ----------------------------------*/
mbed_official 80:2dab120a94c2 101
mbed_official 80:2dab120a94c2 102 static __inline U32 *rt_ret_regs (P_TCB p_TCB) {
mbed_official 80:2dab120a94c2 103 /* Get pointer to task return value registers (R0..R3) in Stack */
mbed_official 80:2dab120a94c2 104
mbed_official 80:2dab120a94c2 105 /* Stack Frame: CPSR,R0-R13,PC */
mbed_official 80:2dab120a94c2 106 return (U32 *)(p_TCB->tsk_stack + TCB_STACK_R0_OFFSET_BYTES);
mbed_official 80:2dab120a94c2 107 }
mbed_official 80:2dab120a94c2 108
mbed_official 80:2dab120a94c2 109 void rt_ret_val (P_TCB p_TCB, U32 v0) {
mbed_official 80:2dab120a94c2 110 U32 *ret;
mbed_official 80:2dab120a94c2 111
mbed_official 80:2dab120a94c2 112 ret = rt_ret_regs(p_TCB);
mbed_official 80:2dab120a94c2 113 ret[0] = v0;
mbed_official 80:2dab120a94c2 114 }
mbed_official 80:2dab120a94c2 115
mbed_official 80:2dab120a94c2 116 void rt_ret_val2(P_TCB p_TCB, U32 v0, U32 v1) {
mbed_official 80:2dab120a94c2 117 U32 *ret;
mbed_official 80:2dab120a94c2 118
mbed_official 80:2dab120a94c2 119 ret = rt_ret_regs(p_TCB);
mbed_official 80:2dab120a94c2 120 ret[0] = v0;
mbed_official 80:2dab120a94c2 121 ret[1] = v1;
mbed_official 80:2dab120a94c2 122 }
mbed_official 80:2dab120a94c2 123
mbed_official 80:2dab120a94c2 124
mbed_official 80:2dab120a94c2 125 /*--------------------------- dbg_init --------------------------------------*/
mbed_official 80:2dab120a94c2 126
mbed_official 80:2dab120a94c2 127 #ifdef DBG_MSG
mbed_official 80:2dab120a94c2 128 void dbg_init (void) {
mbed_official 80:2dab120a94c2 129 if ((DEMCR & DEMCR_TRCENA) &&
mbed_official 80:2dab120a94c2 130 (ITM_CONTROL & ITM_ITMENA) &&
mbed_official 80:2dab120a94c2 131 (ITM_ENABLE & (1UL << 31))) {
mbed_official 80:2dab120a94c2 132 dbg_msg = __TRUE;
mbed_official 80:2dab120a94c2 133 }
mbed_official 80:2dab120a94c2 134 }
mbed_official 80:2dab120a94c2 135 #endif
mbed_official 80:2dab120a94c2 136
mbed_official 80:2dab120a94c2 137 /*--------------------------- dbg_task_notify -------------------------------*/
mbed_official 80:2dab120a94c2 138
mbed_official 80:2dab120a94c2 139 #ifdef DBG_MSG
mbed_official 80:2dab120a94c2 140 void dbg_task_notify (P_TCB p_tcb, BOOL create) {
mbed_official 80:2dab120a94c2 141 while (ITM_PORT31_U32 == 0);
mbed_official 80:2dab120a94c2 142 ITM_PORT31_U32 = (U32)p_tcb->ptask;
mbed_official 80:2dab120a94c2 143 while (ITM_PORT31_U32 == 0);
mbed_official 80:2dab120a94c2 144 ITM_PORT31_U16 = (create << 8) | p_tcb->task_id;
mbed_official 80:2dab120a94c2 145 }
mbed_official 80:2dab120a94c2 146 #endif
mbed_official 80:2dab120a94c2 147
mbed_official 80:2dab120a94c2 148 /*--------------------------- dbg_task_switch -------------------------------*/
mbed_official 80:2dab120a94c2 149
mbed_official 80:2dab120a94c2 150 #ifdef DBG_MSG
mbed_official 80:2dab120a94c2 151 void dbg_task_switch (U32 task_id) {
mbed_official 80:2dab120a94c2 152 while (ITM_PORT31_U32 == 0);
mbed_official 80:2dab120a94c2 153 ITM_PORT31_U8 = task_id;
mbed_official 80:2dab120a94c2 154 }
mbed_official 80:2dab120a94c2 155 #endif
mbed_official 80:2dab120a94c2 156
mbed_official 80:2dab120a94c2 157
mbed_official 80:2dab120a94c2 158 /*----------------------------------------------------------------------------
mbed_official 80:2dab120a94c2 159 * end of file
mbed_official 80:2dab120a94c2 160 *---------------------------------------------------------------------------*/
mbed_official 80:2dab120a94c2 161