mirror of
https://github.com/eclipse-threadx/threadx.git
synced 2025-11-16 04:24:48 +00:00
130 lines
6.7 KiB
ArmAsm
130 lines
6.7 KiB
ArmAsm
/**************************************************************************/
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/* */
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/* Copyright (c) Microsoft Corporation. All rights reserved. */
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/* */
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/* This software is licensed under the Microsoft Software License */
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/* Terms for Microsoft Azure RTOS. Full text of the license can be */
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/* found in the LICENSE file at https://aka.ms/AzureRTOS_EULA */
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/* and in the root directory of this software. */
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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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/* #define TX_SOURCE_CODE */
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/* Include necessary system files. */
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/* #include "tx_api.h"
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#include "tx_initialize.h"
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#include "tx_thread.h"
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#include "tx_timer.h" */
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EXTERN _tx_thread_system_stack_ptr
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EXTERN _tx_initialize_unused_memory
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EXTERN _tx_thread_context_save
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EXTERN _tx_thread_context_restore
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EXTERN _tx_timer_interrupt
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RSEG FREE_MEM: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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SECTION `.text`:CODE:REORDER:NOROOT(2)
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CODE
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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 RISC-V32/IAR */
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/* 6.1 */
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/* AUTHOR */
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/* */
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/* William E. Lamie, Microsoft Corporation */
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/* Tom van Leeuwen, Technolution B.V. */
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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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/* 09-30-2020 William E. Lamie Initial Version 6.1 */
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/* */
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/**************************************************************************/
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/* VOID _tx_initialize_low_level(VOID)
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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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sw sp, _tx_thread_system_stack_ptr, t0 ; Save system stack pointer
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la t0, __tx_free_memory_start ; Pickup first free address
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sw t0, _tx_initialize_unused_memory, t1 ; Save unused memory address
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ret
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/* Define the actual timer interrupt/exception handler. */
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PUBLIC _tx_timer_interrupt_handler
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PUBLIC __minterrupt_000007
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EXTWEAK __require_minterrupt_vector_table
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_tx_timer_interrupt_handler:
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__minterrupt_000007:
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REQUIRE __require_minterrupt_vector_table
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/* Before calling _tx_thread_context_save, we have to allocate an interrupt
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stack frame and save the current value of x1 (ra). */
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#if __iar_riscv_base_isa == rv32e
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addi sp, sp, -260 ; Allocate space for all registers - with floating point enabled
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#else
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addi sp, sp, -128 ; Allocate space for all registers - without floating point enabled
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#endif
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sw x1, 0x70(sp) ; Store RA
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call _tx_thread_context_save ; Call ThreadX context save
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/* Call the ThreadX timer routine. */
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call _tx_timer_interrupt ; Call timer interrupt handler
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/* Timer interrupt processing is done, jump to ThreadX context restore. */
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j _tx_thread_context_restore ; Jump to ThreadX context restore function. Note: this does not return!
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END
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