106 lines
5.5 KiB
ArmAsm
106 lines
5.5 KiB
ArmAsm
;/***************************************************************************
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; * Copyright (c) 2024 Microsoft Corporation
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; *
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; * This program and the accompanying materials are made available under the
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; * terms of the MIT License which is available at
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; * https://opensource.org/licenses/MIT.
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; *
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; * SPDX-License-Identifier: MIT
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; **************************************************************************/
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;
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;
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;/**************************************************************************/
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;/**************************************************************************/
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;/** */
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;/** ThreadX Component */
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;/** */
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;/** Initialize */
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;/** */
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;/**************************************************************************/
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;/**************************************************************************/
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;
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extern __tx_initialize_unused_memory
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section .text:CODE:ROOT
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;
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;/**************************************************************************/
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;/* */
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;/* FUNCTION RELEASE */
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;/* */
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;/* _tx_initialize_low_level RXv3/IAR */
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;/* 6.1.11 */
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;/* AUTHOR */
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;/* */
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;/* William E. Lamie, Microsoft Corporation */
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;/* */
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;/* DESCRIPTION */
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;/* */
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;/* This function is responsible for any low-level processor */
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;/* initialization, including setting up interrupt vectors, setting */
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;/* up a periodic timer interrupt source, saving the system stack */
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;/* pointer for use in ISR processing later, and finding the first */
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;/* available RAM memory address for tx_application_define. */
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;/* */
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;/* INPUT */
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;/* */
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;/* None */
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;/* */
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;/* OUTPUT */
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;/* */
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;/* None */
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;/* */
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;/* CALLS */
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;/* */
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;/* None */
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;/* */
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;/* CALLED BY */
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;/* */
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;/* _tx_initialize_kernel_enter ThreadX entry function */
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;/* */
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;/* RELEASE HISTORY */
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;/* */
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;/* DATE NAME DESCRIPTION */
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;/* */
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;/* 06-02-2021 William E. Lamie Initial Version 6.1.7 */
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;/* 10-15-2021 William E. Lamie Modified comment(s), */
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;/* resulting in version 6.1.9 */
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;/* 01-31-2022 William E. Lamie Modified comment(s), */
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;/* resulting in version 6.1.10 */
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;/* 04-25-2022 William E. Lamie Modified comment(s), */
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;/* resulting in version 6.1.11 */
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;/* */
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;/**************************************************************************/
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public __tx_initialize_low_level
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__tx_initialize_low_level:
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; /* Save the first available memory address. */
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; _tx_initialize_unused_memory = (VOID_PTR) &free_mem_start;
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;
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MOV.L #__tx_free_memory_start, R1 ; Pickup unused memory address
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MOV.L #__tx_initialize_unused_memory,R2
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MOV.L R1,[R2] ; Save first free memory address
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; /* Set priority of SWINT to 1. */
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MOV.L #0x87303, r1
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MOV.L #1, r2
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MOV.B r2, [r1]
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; /* Enable SWINT. */
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MOV.L #0x87203, r1
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MOV.B [r1], r2
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OR #(1 << 3), r2
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MOV.B r2, [r1]
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RTS
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section FREEMEM:DATA
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public __tx_free_memory_start
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__tx_free_memory_start
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DS32 4
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END
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