2 * ; * FreeRTOS Kernel V11.2.0
3 * ; * Copyright (C) 2021 Amazon.com, Inc. or its affiliates. All Rights Reserved.
5 * ; * SPDX-License-Identifier: MIT
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29 #include "FreeRTOSConfig.h"
32 Variables used by scheduler
34 ------------------------------------------------------------------------------
36 EXTERN usCriticalNesting
39 ------------------------------------------------------------------------------
41 portSAVE_CONTEXT MACRO
43 Saves the context of the general purpose registers, CS and ES( only in far
45 memory mode ) registers the usCriticalNesting Value and the Stack Pointer
47 of the active Task onto the task stack
49 ------------------------------------------------------------------------------
50 portSAVE_CONTEXT MACRO
53 Save AX Register to stack.
62 Save the remaining general purpose registers.
64 MOVW AX, usCriticalNesting;
65 Save the usCriticalNesting value.
67 MOVW AX, pxCurrentTCB;
68 Save the Stack pointer.
74 ------------------------------------------------------------------------------
77 ------------------------------------------------------------------------------
79 portRESTORE_CONTEXT MACRO
81 Restores the task Stack Pointer then use this to restore usCriticalNesting,
83 general purpose registers and the CS and ES( only in far memory mode )
85 of the selected task from the task stack
87 ------------------------------------------------------------------------------
88 portRESTORE_CONTEXT MACRO
89 MOVW AX, pxCurrentTCB;
90 Restore the Stack pointer.
95 Restore usCriticalNesting value.
96 MOVW usCriticalNesting, AX
98 Restore the necessary general purpose registers.
101 Restore the ES register.
104 Restore the CS register.
107 Restore general purpose register HL.
112 ------------------------------------------------------------------------------