ports_arch/ARMv7-A/threadx/common/src/tx_thread_interrupt_control.S


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/***************************************************************************
 * Copyright (c) 2024 Microsoft Corporation
 * Copyright (c) 2026-present Eclipse ThreadX contributors
 *
 * 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

    .syntax unified
#if defined(THUMB_MODE)
    .thumb
#else
    .arm
#endif

INT_MASK        =   0x0C0
IRQ_MASK        =   0x080
#ifdef TX_ENABLE_FIQ_SUPPORT
FIQ_MASK        =   0x040
#endif

    .text
    .align 2
/**************************************************************************/
/*                                                                        */
/*  FUNCTION                                               RELEASE        */
/*                                                                        */
/*    _tx_thread_interrupt_control                         ARMv7-A        */
/*                                                           6.4.0        */
/*  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                                                    */
/*                                                                        */
/**************************************************************************/
#if defined(THUMB_MODE)
    .thumb_func
#endif
    .global _tx_thread_interrupt_control
    .type   _tx_thread_interrupt_control,function
_tx_thread_interrupt_control:
    MRS     r1, CPSR                            // Pickup current CPSR

#ifdef TX_ENABLE_FIQ_SUPPORT
    CPSID   if                                  // Disable IRQ and FIQ
#else
    CPSID   i                                   // Disable IRQ
#endif

    TST     r0, #IRQ_MASK
    BNE     no_irq
    CPSIE   i
no_irq:
#ifdef TX_ENABLE_FIQ_SUPPORT
    TST     r0, #FIQ_MASK
    BNE     no_fiq
    CPSIE   f
no_fiq:
#endif

    AND     r0, r1, #INT_MASK
    BX      lr