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158 lines
4.7 KiB
ArmAsm
158 lines
4.7 KiB
ArmAsm
/*
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FreeRTOS V6.0.0 - Copyright (C) 2009 Real Time Engineers Ltd.
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This file is part of the FreeRTOS distribution.
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FreeRTOS is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License (version 2) as published by the
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Free Software Foundation and modified by the FreeRTOS exception.
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**NOTE** The exception to the GPL is included to allow you to distribute a
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combined work that includes FreeRTOS without being obliged to provide the
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source code for proprietary components outside of the FreeRTOS kernel.
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Alternative commercial license and support terms are also available upon
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request. See the licensing section of http://www.FreeRTOS.org for full
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license details.
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FreeRTOS is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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more details.
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You should have received a copy of the GNU General Public License along
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with FreeRTOS; if not, write to the Free Software Foundation, Inc., 59
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Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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***************************************************************************
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* *
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* The FreeRTOS eBook and reference manual are available to purchase for a *
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* small fee. Help yourself get started quickly while also helping the *
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* FreeRTOS project! See http://www.FreeRTOS.org/Documentation for details *
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* *
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***************************************************************************
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1 tab == 4 spaces!
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Please ensure to read the configuration and relevant port sections of the
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online documentation.
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http://www.FreeRTOS.org - Documentation, latest information, license and
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contact details.
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http://www.SafeRTOS.com - A version that is certified for use in safety
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critical systems.
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http://www.OpenRTOS.com - Commercial support, development, porting,
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licensing and training services.
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*/
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/*
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Change from V4.2.1:
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+ Introduced usage of configKERNEL_INTERRUPT_PRIORITY macro to set the
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interrupt priority used by the kernel.
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*/
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#include <FreeRTOSConfig.h>
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/* For backward compatibility, ensure configKERNEL_INTERRUPT_PRIORITY is
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defined. The value zero should also ensure backward compatibility.
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FreeRTOS.org versions prior to V4.3.0 did not include this definition. */
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#ifndef configKERNEL_INTERRUPT_PRIORITY
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#define configKERNEL_INTERRUPT_PRIORITY 0
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#endif
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RSEG CODE:CODE(2)
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thumb
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EXTERN vPortYieldFromISR
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EXTERN pxCurrentTCB
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EXTERN vTaskSwitchContext
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PUBLIC vSetMSP
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PUBLIC xPortPendSVHandler
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PUBLIC vPortSetInterruptMask
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PUBLIC vPortClearInterruptMask
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PUBLIC vPortSVCHandler
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PUBLIC vPortStartFirstTask
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/*-----------------------------------------------------------*/
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vSetMSP
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msr msp, r0
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bx lr
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/*-----------------------------------------------------------*/
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xPortPendSVHandler:
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mrs r0, psp
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ldr r3, =pxCurrentTCB /* Get the location of the current TCB. */
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ldr r2, [r3]
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stmdb r0!, {r4-r11} /* Save the remaining registers. */
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str r0, [r2] /* Save the new top of stack into the first member of the TCB. */
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stmdb sp!, {r3, r14}
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mov r0, #configMAX_SYSCALL_INTERRUPT_PRIORITY
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msr basepri, r0
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bl vTaskSwitchContext
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mov r0, #0
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msr basepri, r0
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ldmia sp!, {r3, r14}
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ldr r1, [r3]
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ldr r0, [r1] /* The first item in pxCurrentTCB is the task top of stack. */
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ldmia r0!, {r4-r11} /* Pop the registers. */
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msr psp, r0
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bx r14
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/*-----------------------------------------------------------*/
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vPortSetInterruptMask:
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push { r0 }
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mov R0, #configMAX_SYSCALL_INTERRUPT_PRIORITY
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msr BASEPRI, R0
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pop { R0 }
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bx r14
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/*-----------------------------------------------------------*/
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vPortClearInterruptMask:
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PUSH { r0 }
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MOV R0, #0
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MSR BASEPRI, R0
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POP { R0 }
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bx r14
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/*-----------------------------------------------------------*/
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vPortSVCHandler;
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ldr r3, =pxCurrentTCB
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ldr r1, [r3]
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ldr r0, [r1]
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ldmia r0!, {r4-r11}
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msr psp, r0
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mov r0, #0
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msr basepri, r0
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orr r14, r14, #13
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bx r14
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/*-----------------------------------------------------------*/
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vPortStartFirstTask
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/* Use the NVIC offset register to locate the stack. */
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ldr r0, =0xE000ED08
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ldr r0, [r0]
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ldr r0, [r0]
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/* Set the msp back to the start of the stack. */
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msr msp, r0
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/* Call SVC to start the first task. */
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svc 0
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END
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