Diff: rtx_ca/HAL_CA.c

Revision:

48:e9a2c7cb57a4

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/rtx_ca/HAL_CA.c	Thu Nov 06 11:00:33 2014 +0000
@@ -0,0 +1,126 @@
+/*----------------------------------------------------------------------------
+ *      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
+ *---------------------------------------------------------------------------*/