mirror of
https://github.com/FreeRTOS/FreeRTOS-Kernel.git
synced 2025-04-22 06:21:58 -04:00
169 lines
5.3 KiB
NASM
169 lines
5.3 KiB
NASM
;/*
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; FreeRTOS V7.1.1 - Copyright (C) 2012 Real Time Engineers Ltd.
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;
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;
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; ***************************************************************************
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; * *
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; * FreeRTOS tutorial books are available in pdf and paperback. *
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; * Complete, revised, and edited pdf reference manuals are also *
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; * available. *
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; * *
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; * Purchasing FreeRTOS documentation will not only help you, by *
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; * ensuring you get running as quickly as possible and with an *
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; * in-depth knowledge of how to use FreeRTOS, it will also help *
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; * the FreeRTOS project to continue with its mission of providing *
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; * professional grade, cross platform, de facto standard solutions *
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; * for microcontrollers - completely free of charge! *
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; * *
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; * >>> See http://www.FreeRTOS.org/Documentation for details. <<< *
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; * *
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; * Thank you for using FreeRTOS, and thank you for your support! *
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; * *
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; ***************************************************************************
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;
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;
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; This file is part of the FreeRTOS distribution.
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;
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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 modification to the GPL is included to allow you to
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; distribute a combined work that includes FreeRTOS without being obliged to
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; provide the source code for proprietary components outside of the FreeRTOS
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; kernel. FreeRTOS is distributed in the hope that it will be useful, but
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; WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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; or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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; more details. You should have received a copy of the GNU General Public
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; License and the FreeRTOS license exception along with FreeRTOS; if not it
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; can be viewed here: http://www.freertos.org/a00114.html and also obtained
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; by writing to Richard Barry, contact details for whom are available on the
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; FreeRTOS WEB site.
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;
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; 1 tab == 4 spaces!
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;
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; http://www.FreeRTOS.org - Documentation, latest information, license and
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; contact details.
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;
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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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;
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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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.extern pxCurrentTCB
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.extern vTaskSwitchContext
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.extern ulMaxSyscallInterruptPriorityConst
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.global PendSV_Handler
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.global SVC_Handler
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.global vPortStartFirstTask
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.global vPortEnableVFP
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;-----------------------------------------------------------
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.section .text
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.thumb
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.align 4
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PendSV_Handler: .type func
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mrs r0, psp
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;Get the location of the current TCB.
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ldr.w r3, =pxCurrentTCB
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ldr r2, [r3]
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;Is the task using the FPU context? If so, push high vfp registers.
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tst r14, #0x10
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it eq
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vstmdbeq r0!, {s16-s31}
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;Save the core registers.
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stmdb r0!, {r4-r11, r14}
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;Save the new top of stack into the first member of the TCB.
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str r0, [r2]
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stmdb sp!, {r3, r14}
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ldr.w r0, =ulMaxSyscallInterruptPriorityConst
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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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;The first item in pxCurrentTCB is the task top of stack.
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ldr r1, [r3]
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ldr r0, [r1]
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;Pop the core registers.
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ldmia r0!, {r4-r11, r14}
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;Is the task using the FPU context? If so, pop the high vfp registers too.
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tst r14, #0x10
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it eq
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vldmiaeq r0!, {s16-s31}
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msr psp, r0
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bx r14
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.size PendSV_Handler, $-PendSV_Handler
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.endsec
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;-----------------------------------------------------------
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.section .text
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.thumb
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.align 4
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SVC_Handler: .type func
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;Get the location of the current TCB.
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ldr.w r3, =pxCurrentTCB
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ldr r1, [r3]
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ldr r0, [r1]
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;Pop the core registers.
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ldmia r0!, {r4-r11, r14}
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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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bx r14
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.size SVC_Handler, $-SVC_Handler
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.endsec
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;-----------------------------------------------------------
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.section .text
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.thumb
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.align 4
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vPortStartFirstTask .type func
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;Use the NVIC offset register to locate the stack.
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ldr.w 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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cpsie i
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svc 0
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.size vPortStartFirstTask, $-vPortStartFirstTask
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.endsec
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;-----------------------------------------------------------
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.section .text
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.thumb
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.align 4
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vPortEnableVFP .type func
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;The FPU enable bits are in the CPACR.
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ldr.w r0, =0xE000ED88
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ldr r1, [r0]
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;Enable CP10 and CP11 coprocessors, then save back.
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orr r1, r1, #( 0xf << 20 )
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str r1, [r0]
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bx r14
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.size vPortEnableVFP, $-vPortEnableVFP
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.endsec
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.end
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