123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126 |
- /*----------------------------------------------------------------------------
- * RL-ARM - RTX
- *----------------------------------------------------------------------------
- * Name: HAL_CA.C
- * Purpose: Hardware Abstraction Layer for Cortex-A
- * Rev.:
- *----------------------------------------------------------------------------
- *
- * Copyright (c) 2012 ARM Limited
- * All rights reserved.
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- * - Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * - 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.
- * - Neither the name of ARM 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 COPYRIGHT HOLDERS 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 COPYRIGHT HOLDERS AND 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.
- *---------------------------------------------------------------------------*/
-
- #include "rt_TypeDef.h"
- #include "RTX_Config.h"
- #include "rt_HAL_CA.h"
-
- /*--------------------------- os_init_context -------------------------------*/
-
- void rt_init_stack (P_TCB p_TCB, FUNCP task_body) {
- /* Prepare TCB and saved context for a first time start of a task. */
- U32 *stk,i,size;
-
- /* Prepare a complete interrupt frame for first task start */
- size = p_TCB->priv_stack >> 2;
- if (size == 0) {
- size = (U16)os_stackinfo >> 2;
- }
- /* Write to the top of stack. */
- stk = &p_TCB->stack[size];
-
- /* Auto correct to 8-byte ARM stack alignment. */
- if ((U32)stk & 0x04) {
- stk--;
- }
-
- stk -= 16;
-
- /* Initial PC and default CPSR */
- stk[14] = (U32)task_body;
- /* Task run mode is inherited from the startup file. */
- /* (non-privileged USER or privileged SYSTEM mode) */
- stk[15] = (os_flags & 1) ? INIT_CPSR_SYS : INIT_CPSR_USER;
- /* Set T-bit if task function in Thumb mode. */
- if ((U32)task_body & 1) {
- stk[15] |= CPSR_T_BIT;
- }
- /* Assign a void pointer to R0. */
- stk[8] = (U32)p_TCB->msg;
- /* Clear R1-R12,LR registers. */
- for (i = 0; i < 8; i++) {
- stk[i] = 0;
- }
- for (i = 9; i < 14; i++) {
- stk[i] = 0;
- }
-
- /* Initial Task stack pointer. */
- p_TCB->tsk_stack = (U32)stk;
-
- /* Task entry point. */
- p_TCB->ptask = task_body;
-
- /* Set a magic word for checking of stack overflow. */
- p_TCB->stack[0] = MAGIC_WORD;
- }
-
-
- /*--------------------------- rt_ret_val ----------------------------------*/
-
- static __inline U32 *rt_ret_regs (P_TCB p_TCB) {
- /* Get pointer to task return value registers (R0..R3) in Stack */
- #if (__TARGET_FPU_VFP)
- if (p_TCB->stack_frame & 0x2) {
- /* Extended Stack Frame: S0-31,FPSCR,Reserved,R4-R11,R0-R3,R12,LR,PC,xPSR */
- return (U32 *)(p_TCB->tsk_stack + 8*4 + 34*4);
- } else {
- /* Basic Stack Frame: R4-R11,R0-R3,R12,LR,PC,xPSR */
- return (U32 *)(p_TCB->tsk_stack + 8*4);
- }
- #else
- /* Stack Frame: R4-R11,R0-R3,R12,LR,PC,xPSR */
- return (U32 *)(p_TCB->tsk_stack + 8*4);
- #endif
- }
-
- void rt_ret_val (P_TCB p_TCB, U32 v0) {
- U32 *ret;
-
- ret = rt_ret_regs(p_TCB);
- ret[0] = v0;
- }
-
- void rt_ret_val2(P_TCB p_TCB, U32 v0, U32 v1) {
- U32 *ret;
-
- ret = rt_ret_regs(p_TCB);
- ret[0] = v0;
- ret[1] = v1;
- }
-
-
- /*----------------------------------------------------------------------------
- * end of file
- *---------------------------------------------------------------------------*/
|