ports/rxv2/ccrx/src/tx_thread_interrupt_control.src


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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                                                              */
;/**                                                                       */
;/**************************************************************************/
;/**************************************************************************/
;
;#define TX_SOURCE_CODE
;
;
;/* Include necessary system files.  */
;
;#include "tx_api.h"
;#include "tx_thread.h"
;
;
    .SECTION    P,CODE
;/**************************************************************************/
;/*                                                                        */
;/*  FUNCTION                                               RELEASE        */
;/*                                                                        */
;/*    _tx_thread_interrupt_control                         RXc2/CCRX      */
;/*                                                           6.1.11       */
;/*  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                                                    */
;/*                                                                        */
;/*  RELEASE HISTORY                                                       */
;/*                                                                        */
;/*    DATE              NAME                      DESCRIPTION             */
;/*                                                                        */
;/*  12-30-2020     William E. Lamie         Initial Version 6.1.3         */
;/*  10-15-2021     William E. Lamie         Modified comment(s),          */
;/*                                            resulting in version 6.1.9  */
;/*  01-31-2022     William E. Lamie         Modified comment(s),          */
;/*                                            resulting in version 6.1.10 */
;/*  04-25-2022     William E. Lamie         Modified comment(s),          */
;/*                                            resulting in version 6.1.11 */
;/*                                                                        */
;/**************************************************************************/
;UINT   _tx_thread_interrupt_control(UINT new_posture)
;{

.GLB __tx_thread_interrupt_control
__tx_thread_interrupt_control:
;
;    /* Pickup current interrupt lockout posture.  */
;

    MVFC      PSW, R2           ; Save PSW to R2
    MOV.L     R2, R3            ; Make a copy of PSW in r3

;
;    /* Apply the new interrupt posture.  */
;

    BTST    #16, R1             ; Test I bit of PSW of "new posture"
    BMNE    #16, R2             ; Conditionally set I bit of intermediate posture

    MVTC    R2, PSW             ; Save intermediate posture to PSW

    MOV.L   R3,R1               ; Get original SR
    RTS                         ; Return to caller
;}
    .END