Diff: mbed-rtos/rtx/LPC1768/ARM/HAL_CM3.c

Revision:

0:1c8f2727e9f5

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed-rtos/rtx/LPC1768/ARM/HAL_CM3.c	Thu Apr 03 22:56:32 2014 +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
+ *---------------------------------------------------------------------------*/
+