ports/arm9/gnu/src/tx_thread_interrupt_control.S


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@/***************************************************************************
@ * Copyright (c) 2024 Microsoft Corporation
@ *
@ * This program and the accompanying materials are made available under the
@ * terms of the MIT License which is available at
@ * https://opensource.org/licenses/MIT.
@ *
@ * SPDX-License-Identifier: MIT
@ **************************************************************************/
@
@
@/**************************************************************************/
@/**************************************************************************/
@/**                                                                       */
@/** ThreadX Component                                                     */
@/**                                                                       */
@/**   Thread                                                              */
@/**                                                                       */
@/**************************************************************************/
@/**************************************************************************/
#ifdef TX_INCLUDE_USER_DEFINE_FILE
#include "tx_user.h"
#endif


INT_MASK        =   0x03F

@
@/* Define the 16-bit Thumb mode veneer for _tx_thread_interrupt_control for
@   applications calling this function from to 16-bit Thumb mode.  */
@
    .text
    .align 2
    .global $_tx_thread_interrupt_control
$_tx_thread_interrupt_control:
        .thumb
     BX        pc                               @ Switch to 32-bit mode
     NOP                                        @
    .arm
     STMFD     sp!, {lr}                        @ Save return address
     BL        _tx_thread_interrupt_control     @ Call _tx_thread_interrupt_control function
     LDMFD     sp!, {lr}                        @ Recover saved return address
     BX        lr                               @ Return to 16-bit caller
@
@
    .text
    .align 2
@/**************************************************************************/
@/*                                                                        */
@/*  FUNCTION                                               RELEASE        */
@/*                                                                        */
@/*    _tx_thread_interrupt_control                         ARM9/GNU       */
@/*                                                           6.2.1        */
@/*  AUTHOR                                                                */
@/*                                                                        */
@/*    William E. Lamie, Microsoft Corporation                             */
@/*                                                                        */
@/*  DESCRIPTION                                                           */
@/*                                                                        */
@/*    This function is responsible for changing the interrupt lockout     */
@/*    posture of the system.                                              */
@/*                                                                        */
@/*  INPUT                                                                 */
@/*                                                                        */
@/*    new_posture                           New interrupt lockout posture */
@/*                                                                        */
@/*  OUTPUT                                                                */
@/*                                                                        */
@/*    old_posture                           Old interrupt lockout posture */
@/*                                                                        */
@/*  CALLS                                                                 */
@/*                                                                        */
@/*    None                                                                */
@/*                                                                        */
@/*  CALLED BY                                                             */
@/*                                                                        */
@/*    Application Code                                                    */
@/*                                                                        */
@/**************************************************************************/
@UINT   _tx_thread_interrupt_control(UINT new_posture)
@{
    .global _tx_thread_interrupt_control
    .type   _tx_thread_interrupt_control,function
_tx_thread_interrupt_control:
@
@    /* Pickup current interrupt lockout posture.  */
@
    MRS     r3, CPSR                    @ Pickup current CPSR
    MOV     r2, #INT_MASK               @ Build interrupt mask
    AND     r1, r3, r2                  @ Clear interrupt lockout bits
    ORR     r1, r1, r0                  @ Or-in new interrupt lockout bits
@
@    /* Apply the new interrupt posture.  */
@
    MSR     CPSR, r1                    @ Setup new CPSR
    BIC     r0, r3, r2                  @ Return previous interrupt mask
#ifdef __THUMB_INTERWORK
    BX      lr                          @ Return to caller
#else
    MOV     pc, lr                      @ Return to caller
#endif
@}