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64 lines
2.4 KiB
ArmAsm
64 lines
2.4 KiB
ArmAsm
;/*
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; * FreeRTOS Kernel V10.0.1
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; * Copyright (C) 2017 Amazon.com, Inc. or its affiliates. All Rights Reserved.
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; *
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; * Permission is hereby granted, free of charge, to any person obtaining a copy of
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; * this software and associated documentation files (the "Software"), to deal in
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; * the Software without restriction, including without limitation the rights to
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; * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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; * the Software, and to permit persons to whom the Software is furnished to do so,
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; * subject to the following conditions:
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; *
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; * The above copyright notice and this permission notice shall be included in all
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; * copies or substantial portions of the Software.
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; *
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; * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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; * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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; * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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; * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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; * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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; * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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; *
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; * http://www.FreeRTOS.org
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; * http://aws.amazon.com/freertos
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; *
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; * 1 tab == 4 spaces!
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; */
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INCLUDE portmacro.inc
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;The UART interrupt entry point is defined within an assembly wrapper
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;within this file. This takes care of the task context saving before it
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;calls the main handler (vUART_ISRHandler()) which is written in C within
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;serial.c. The execution of the handler can unblock tasks that were blocked
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;waiting for UART events. Once the handler completes the asm wrapper
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;finishes off by restoring the context of whichever task is now selected to
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;enter the RUNNING state (which might now be a different task to that which
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;was originally interrupted.
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IMPORT vUART_ISRHandler
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EXPORT vUART_ISREntry
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;/* Interrupt entry must always be in ARM mode. */
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ARM
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AREA |.text|, CODE, READONLY
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vUART_ISREntry
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PRESERVE8
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; Save the context of the interrupted task.
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portSAVE_CONTEXT
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; Call the C handler function - defined within serial.c.
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LDR R0, =vUART_ISRHandler
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MOV LR, PC
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BX R0
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; Finish off by restoring the context of the task that has been chosen to
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; run next - which might be a different task to that which was originally
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; interrupted.
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portRESTORE_CONTEXT
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END
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