1/***************************************************************************
2 * Copyright (c) 2024 Microsoft Corporation
3 *
4 * This program and the accompanying materials are made available under the
5 * terms of the MIT License which is available at
6 * https://opensource.org/licenses/MIT.
7 *
8 * SPDX-License-Identifier: MIT
9 **************************************************************************/
10
11
12/**************************************************************************/
13/**************************************************************************/
14/**                                                                       */
15/** ThreadX Component                                                     */
16/**                                                                       */
17/**   Thread                                                              */
18/**                                                                       */
19/**************************************************************************/
20/**************************************************************************/
21
22    RETURN_MASK = 0x000000000000000F
23    SET_SR_MASK = 0xFFFFFFFFFFFFFFF0
24
25    .section .text
26/**************************************************************************/
27/*                                                                        */
28/*  FUNCTION                                               RELEASE        */
29/*                                                                        */
30/*    _tx_thread_interrupt_control                       RISC-V64/GNU     */
31/*                                                           6.2.1        */
32/*  AUTHOR                                                                */
33/*                                                                        */
34/*    Scott Larson, Microsoft Corporation                                 */
35/*                                                                        */
36/*  DESCRIPTION                                                           */
37/*                                                                        */
38/*    This function is responsible for changing the interrupt lockout     */
39/*    posture of the system.                                              */
40/*                                                                        */
41/*  INPUT                                                                 */
42/*                                                                        */
43/*    new_posture                           New interrupt lockout posture */
44/*                                                                        */
45/*  OUTPUT                                                                */
46/*                                                                        */
47/*    old_posture                           Old interrupt lockout posture */
48/*                                                                        */
49/*  CALLS                                                                 */
50/*                                                                        */
51/*    None                                                                */
52/*                                                                        */
53/*  CALLED BY                                                             */
54/*                                                                        */
55/*    Application Code                                                    */
56/*                                                                        */
57/*  RELEASE HISTORY                                                       */
58/*                                                                        */
59/*    DATE              NAME                      DESCRIPTION             */
60/*                                                                        */
61/*  03-08-2023      Scott Larson            Initial Version 6.2.1         */
62/*                                                                        */
63/**************************************************************************/
64/* UINT   _tx_thread_interrupt_control(UINT new_posture)
65{  */
66    .global  _tx_thread_interrupt_control
67_tx_thread_interrupt_control:
68    /* Pickup current interrupt lockout posture.  */
69
70    csrr    t0, mstatus
71    mv      t1, t0                                      // Save original mstatus for return
72
73    /* Apply the new interrupt posture.  */
74
75    li      t2, SET_SR_MASK                             // Build set SR mask
76    and     t0, t0, t2                                  // Isolate interrupt lockout bits
77    or      t0, t0, a0                                  // Put new lockout bits in
78    csrw    mstatus, t0
79    andi    a0, t1, RETURN_MASK                         // Return original mstatus.
80    ret
81/* }  */
82