ports_smp/mips32_interaptiv_smp/gnu/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                                                              */
/**                                                                       */
/**************************************************************************/
/**************************************************************************/


    RETURN_MASK =   0x0001
    SET_SR_MASK_U = 0xFFFF
    SET_SR_MASK_L = 0xFFFE

    .text
    .set    noreorder
/**************************************************************************/
/*                                                                        */
/*  FUNCTION                                               RELEASE        */
/*                                                                        */
/*    _tx_thread_interrupt_control                  MIPS32_interAptiv/GNU */
/*                                                           6.2.1        */
/*  AUTHOR                                                                */
/*                                                                        */
/*    Scott Larson, 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)
{  */
    .globl  _tx_thread_interrupt_control
_tx_thread_interrupt_control:

    /* Pickup current interrupt lockout posture.  */

    mfc0    $8, $12                         # Pickup current SR
    andi    $2, $8, RETURN_MASK             # Return value back to caller

    /* Apply the new interrupt posture.  */

    lui     $9, SET_SR_MASK_U               # Build set SR mask
    ori     $9, $9, SET_SR_MASK_L           #
    and     $8, $8, $9                      # Isolate interrupt lockout bits
    or      $8, $8, $4                      # Put new lockout bits in
    mtc0    $8, $12                         # Set new interrupt lockout
    jr.hb   $31                             # Return to caller
    nop                                     # Delay slot
/* }  */