226 lines
6.6 KiB
C
226 lines
6.6 KiB
C
/*----------------------------------------------------------------------------
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* RL-ARM - RTX
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*----------------------------------------------------------------------------
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* Name: HAL_CM3.C
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* Purpose: Hardware Abstraction Layer for Cortex-M3
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* Rev.: V4.60
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*----------------------------------------------------------------------------
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*
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* Copyright (c) 1999-2009 KEIL, 2009-2012 ARM Germany GmbH
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* All rights reserved.
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* - Neither the name of ARM nor the names of its contributors may be used
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* to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDERS AND CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*---------------------------------------------------------------------------*/
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#include "RTX_Conf.h"
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#include "rt_HAL_CM.h"
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#include "rt_MemBox.h"
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#include "rt_System.h"
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#include "rt_Task.h"
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#include "rt_TypeDef.h"
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/*----------------------------------------------------------------------------
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* Functions
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*---------------------------------------------------------------------------*/
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/*--------------------------- rt_set_PSP ------------------------------------*/
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__asm void rt_set_PSP(U32 stack) { MSR PSP, R0 BX LR }
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/*--------------------------- rt_get_PSP ------------------------------------*/
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__asm U32 rt_get_PSP(void) { MRS R0, PSP BX LR }
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/*--------------------------- os_set_env ------------------------------------*/
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__asm void os_set_env(void) {
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/* Switch to Unprivileged/Privileged Thread mode, use PSP. */
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MOV R0, SP;
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PSP = MSP MSR PSP, R0 LDR R0, = __cpp(&os_flags) LDRB R0, [R0] LSLS R0,
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# 31 MOVNE R0, #0x02;
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Privileged Thread mode, use PSP MOVEQ R0, #0x03;
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Unprivileged Thread mode, use PSP MSR CONTROL,
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R0 BX LR
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ALIGN
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}
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/*--------------------------- _alloc_box ------------------------------------*/
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__asm void *_alloc_box(void *box_mem) {
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/* Function wrapper for Unprivileged/Privileged mode. */
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LDR R12, = __cpp(rt_alloc_box) MRS R3, IPSR LSLS R3, #24 BXNE R12 MRS R3,
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CONTROL LSLS R3,
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# 31 BXEQ R12 SVC 0 BX LR
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ALIGN
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}
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/*--------------------------- _free_box -------------------------------------*/
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__asm int _free_box(void *box_mem, void *box) {
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/* Function wrapper for Unprivileged/Privileged mode. */
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LDR R12, = __cpp(rt_free_box) MRS R3, IPSR LSLS R3, #24 BXNE R12 MRS R3,
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CONTROL LSLS R3,
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# 31 BXEQ R12 SVC 0 BX LR
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ALIGN
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}
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/*-------------------------- SVC_Handler ------------------------------------*/
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__asm void SVC_Handler(void) {
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PRESERVE8
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IMPORT SVC_Count IMPORT SVC_Table IMPORT rt_stk_check
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MRS R0,
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PSP;
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Read PSP LDR R1, [ R0, #24 ];
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Read Saved PC from Stack LDRB R1, [ R1, # - 2 ];
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Load SVC Number CBNZ R1,
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SVC_User
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LDM R0,
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{R0 - R3, R12};
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Read R0 - R3, R12 from stack BLX R12;
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Call SVC Function
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MRS R12,
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PSP;
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Read PSP STM R12, {R0 - R2};
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Store return values
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LDR R3,
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= __cpp(&os_tsk) LDM R3, {R1, R2};
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os_tsk.run, os_tsk.new CMP R1, R2 BEQ SVC_Exit;
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no task switch
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CBZ R1,
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SVC_Next;
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Runtask deleted ? STMDB R12 !, {R4 - R11};
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Save Old context STR R12, [ R1, #TCB_TSTACK ];
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Update os_tsk.run->tsk_stack
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PUSH{R2, R3} BL rt_stk_check; Check for Stack overflow
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POP {R2,R3}
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SVC_Next
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STR R2,[R3] ;
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os_tsk.run = os_tsk.new
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LDR R12,
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[ R2, #TCB_TSTACK ];
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os_tsk.new->tsk_stack LDMIA R12 !, {R4 - R11};
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Restore New Context MSR PSP, R12;
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Write PSP
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SVC_Exit MVN LR,
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# : NOT : 0xFFFFFFFD;
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set EXC_RETURN value BX LR
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/*------------------- User SVC ------------------------------*/
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SVC_User PUSH{R4, LR};
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Save Registers LDR R2, = SVC_Count LDR R2, [R2] CMP R1, R2 BHI SVC_Done;
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Overflow
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LDR R4,
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= SVC_Table - 4 LDR R4, [ R4, R1, LSL #2 ];
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Load SVC Function Address
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LDM R0,
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{R0 - R3, R12};
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Read R0 - R3, R12 from stack BLX R4;
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Call SVC Function
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MRS R12,
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PSP STM R12, {R0 - R3};
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Function return values SVC_Done POP{R4, PC};
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RETI
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ALIGN
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}
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/*-------------------------- PendSV_Handler ---------------------------------*/
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__asm void PendSV_Handler(void) {
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PRESERVE8
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BL __cpp(rt_pop_req)
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Sys_Switch LDR R3,
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= __cpp(&os_tsk) LDM R3, {R1, R2};
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os_tsk.run, os_tsk.new CMP R1,
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R2 BEQ Sys_Exit
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MRS R12,
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PSP;
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Read PSP STMDB R12 !, {R4 - R11};
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Save Old context STR R12, [ R1, #TCB_TSTACK ];
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Update os_tsk.run->tsk_stack
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PUSH{R2, R3} BL rt_stk_check; Check for Stack overflow
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POP {R2,R3}
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STR R2,[R3] ;
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os_tsk.run = os_tsk.new
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LDR R12,
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[ R2, #TCB_TSTACK ];
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os_tsk.new->tsk_stack LDMIA R12 !, {R4 - R11};
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Restore New Context MSR PSP, R12;
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Write PSP
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Sys_Exit MVN LR,
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# : NOT : 0xFFFFFFFD;
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set EXC_RETURN value BX LR;
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Return to Thread Mode
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ALIGN
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}
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/*-------------------------- SysTick_Handler --------------------------------*/
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__asm void SysTick_Handler(void) {
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PRESERVE8
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BL __cpp(rt_systick) B Sys_Switch
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ALIGN
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}
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/*-------------------------- OS_Tick_Handler --------------------------------*/
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__asm void OS_Tick_Handler(void) {
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PRESERVE8
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BL __cpp(os_tick_irqack) BL __cpp(rt_systick) B Sys_Switch
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ALIGN
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}
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/*----------------------------------------------------------------------------
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* end of file
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*---------------------------------------------------------------------------*/
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