A S
mbed rtos - modified for the final project of the course "Advanced Operating Systems"
Fork of
mbed-rtos
by 
mbed official
Diff: rtx/LPC1768/ARM/HAL_CM3.c
- Revision:
- 6:350b53afb889
- Child:
- 11:db1fc233faa9
diff -r 9654a71f5a90 -r 350b53afb889 rtx/LPC1768/ARM/HAL_CM3.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/rtx/LPC1768/ARM/HAL_CM3.c Fri Nov 23 09:57:31 2012 +0000
@@ -0,0 +1,249 @@
+/*----------------------------------------------------------------------------
+ * RL-ARM - RTX
+ *----------------------------------------------------------------------------
+ * Name: HAL_CM3.C
+ * Purpose: Hardware Abstraction Layer for Cortex-M3
+ * Rev.: V4.60
+ *----------------------------------------------------------------------------
+ *
+ * Copyright (c) 1999-2009 KEIL, 2009-2012 ARM Germany GmbH
+ * 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_System.h"
+#include "rt_HAL_CM.h"
+#include "rt_Task.h"
+#include "rt_MemBox.h"
+
+
+/*----------------------------------------------------------------------------
+ * Functions
+ *---------------------------------------------------------------------------*/
+
+
+/*--------------------------- rt_set_PSP ------------------------------------*/
+
+__asm void rt_set_PSP (U32 stack) {
+ MSR PSP,R0
+ BX LR
+}
+
+
+/*--------------------------- rt_get_PSP ------------------------------------*/
+
+__asm U32 rt_get_PSP (void) {
+ MRS R0,PSP
+ BX LR
+}
+
+
+/*--------------------------- os_set_env ------------------------------------*/
+
+__asm void os_set_env (void) {
+ /* Switch to Unprivileged/Privileged Thread mode, use PSP. */
+ MOV R0,SP ; PSP = MSP
+ MSR PSP,R0
+ LDR R0,=__cpp(&os_flags)
+ LDRB R0,[R0]
+ LSLS R0,#31
+ MOVNE R0,#0x02 ; Privileged Thread mode, use PSP
+ MOVEQ R0,#0x03 ; Unprivileged Thread mode, use PSP
+ MSR CONTROL,R0
+ BX LR
+
+ ALIGN
+}
+
+
+/*--------------------------- _alloc_box ------------------------------------*/
+
+__asm void *_alloc_box (void *box_mem) {
+ /* Function wrapper for Unprivileged/Privileged mode. */
+ LDR R12,=__cpp(rt_alloc_box)
+ MRS R3,IPSR
+ LSLS R3,#24
+ BXNE R12
+ MRS R3,CONTROL
+ LSLS R3,#31
+ BXEQ R12
+ SVC 0
+ BX LR
+
+ ALIGN
+}
+
+
+/*--------------------------- _free_box -------------------------------------*/
+
+__asm int _free_box (void *box_mem, void *box) {
+ /* Function wrapper for Unprivileged/Privileged mode. */
+ LDR R12,=__cpp(rt_free_box)
+ MRS R3,IPSR
+ LSLS R3,#24
+ BXNE R12
+ MRS R3,CONTROL
+ LSLS R3,#31
+ BXEQ R12
+ SVC 0
+ BX LR
+
+ ALIGN
+}
+
+
+/*-------------------------- SVC_Handler ------------------------------------*/
+
+__asm void SVC_Handler (void) {
+ PRESERVE8
+
+ IMPORT SVC_Count
+ IMPORT SVC_Table
+ IMPORT rt_stk_check
+
+ MRS R0,PSP ; Read PSP
+ LDR R1,[R0,#24] ; Read Saved PC from Stack
+ LDRB R1,[R1,#-2] ; Load SVC Number
+ CBNZ R1,SVC_User
+
+ LDM R0,{R0-R3,R12} ; Read R0-R3,R12 from stack
+ BLX R12 ; Call SVC Function
+
+ MRS R12,PSP ; Read PSP
+ STM R12,{R0-R2} ; Store return values
+
+ LDR R3,=__cpp(&os_tsk)
+ LDM R3,{R1,R2} ; os_tsk.run, os_tsk.new
+ CMP R1,R2
+ BEQ SVC_Exit ; no task switch
+
+ CBZ R1,SVC_Next ; Runtask deleted?
+ STMDB R12!,{R4-R11} ; Save Old context
+ STR R12,[R1,#TCB_TSTACK] ; Update os_tsk.run->tsk_stack
+
+ PUSH {R2,R3}
+ BL rt_stk_check ; Check for Stack overflow
+ POP {R2,R3}
+
+SVC_Next
+ STR R2,[R3] ; os_tsk.run = os_tsk.new
+
+ LDR R12,[R2,#TCB_TSTACK] ; os_tsk.new->tsk_stack
+ LDMIA R12!,{R4-R11} ; Restore New Context
+ MSR PSP,R12 ; Write PSP
+
+SVC_Exit
+ MVN LR,#:NOT:0xFFFFFFFD ; set EXC_RETURN value
+ BX LR
+
+ /*------------------- User SVC ------------------------------*/
+
+SVC_User
+ PUSH {R4,LR} ; Save Registers
+ LDR R2,=SVC_Count
+ LDR R2,[R2]
+ CMP R1,R2
+ BHI SVC_Done ; Overflow
+
+ LDR R4,=SVC_Table-4
+ LDR R4,[R4,R1,LSL #2] ; Load SVC Function Address
+
+ LDM R0,{R0-R3,R12} ; Read R0-R3,R12 from stack
+ BLX R4 ; Call SVC Function
+
+ MRS R12,PSP
+ STM R12,{R0-R3} ; Function return values
+SVC_Done
+ POP {R4,PC} ; RETI
+
+ ALIGN
+}
+
+
+/*-------------------------- PendSV_Handler ---------------------------------*/
+
+__asm void PendSV_Handler (void) {
+ PRESERVE8
+
+ BL __cpp(rt_pop_req)
+
+Sys_Switch
+ LDR R3,=__cpp(&os_tsk)
+ LDM R3,{R1,R2} ; os_tsk.run, os_tsk.new
+ CMP R1,R2
+ BEQ Sys_Exit
+
+ MRS R12,PSP ; Read PSP
+ STMDB R12!,{R4-R11} ; Save Old context
+ STR R12,[R1,#TCB_TSTACK] ; Update os_tsk.run->tsk_stack
+
+ PUSH {R2,R3}
+ BL rt_stk_check ; Check for Stack overflow
+ POP {R2,R3}
+
+ STR R2,[R3] ; os_tsk.run = os_tsk.new
+
+ LDR R12,[R2,#TCB_TSTACK] ; os_tsk.new->tsk_stack
+ LDMIA R12!,{R4-R11} ; Restore New Context
+ MSR PSP,R12 ; Write PSP
+
+Sys_Exit
+ MVN LR,#:NOT:0xFFFFFFFD ; set EXC_RETURN value
+ BX LR ; Return to Thread Mode
+
+ ALIGN
+}
+
+
+/*-------------------------- SysTick_Handler --------------------------------*/
+
+__asm void SysTick_Handler (void) {
+ PRESERVE8
+
+ BL __cpp(rt_systick)
+ B Sys_Switch
+
+ ALIGN
+}
+
+
+/*-------------------------- OS_Tick_Handler --------------------------------*/
+
+__asm void OS_Tick_Handler (void) {
+ PRESERVE8
+
+ BL __cpp(os_tick_irqack)
+ BL __cpp(rt_systick)
+ B Sys_Switch
+
+ ALIGN
+}
+
+
+/*----------------------------------------------------------------------------
+ * end of file
+ *---------------------------------------------------------------------------*/
+