ports/risc-v64/gnu/src/tx_thread_interrupt_control.S


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83

/***************************************************************************
 * 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                                                              */
/**                                                                       */
/**************************************************************************/
/**************************************************************************/


    .section .text
/**************************************************************************/
/*                                                                        */
/*  FUNCTION                                               RELEASE        */
/*                                                                        */
/*    _tx_thread_interrupt_control                       RISC-V64/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)
{  */
    .global  _tx_thread_interrupt_control
_tx_thread_interrupt_control:
    /* Pickup current interrupt lockout posture.  */

#ifdef TX_RISCV_SMODE
    csrr    t0, sstatus
    mv      t1, t0                                      // Save original sstatus for return
    li      t2, ~0x02                                   // Build mask to clear SIE (bit 1)
    and     t0, t0, t2                                  // Clear SIE bit
    andi    a0, a0, 0x02                                // Mask incoming to only SIE bit
    or      t0, t0, a0                                  // Set requested SIE state
    csrw    sstatus, t0
    andi    a0, t1, 0x02                                // Return original SIE bit
#else
    csrr    t0, mstatus
    mv      t1, t0                                      // Save original mstatus for return
    li      t2, ~0x08                                   // Build mask to clear MIE
    and     t0, t0, t2                                  // Clear MIE bit
    andi    a0, a0, 0x08                                // Mask incoming to only MIE bit
    or      t0, t0, a0                                  // Set requested MIE state
    csrw    mstatus, t0
    andi    a0, t1, 0x08                                // Return original MIE bit
#endif
    ret
/* }  */