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


#define GIC_SH_WEDGE        0xbbdc0280          /* For Inter-processor interrupts on MALTA board.  */
#define GIC_SH_COUNTER_LO   0xbbdc0010          /* Lower 32-bits of GIC common counter             */

    .text
    .set        noreorder
/**************************************************************************/
/*                                                                        */
/*  FUNCTION                                               RELEASE        */
/*                                                                        */
/*    _tx_thread_smp_core_preempt                   MIPS32_interAptiv/GNU */
/*                                                           6.2.1        */
/*  AUTHOR                                                                */
/*                                                                        */
/*    Scott Larson, Microsoft Corporation                                 */
/*                                                                        */
/*  DESCRIPTION                                                           */
/*                                                                        */
/*    This function preempts the specified core in situations where the   */
/*    thread corresponding to this core is no longer ready or when the    */
/*    core must be used for a higher-priority thread. If the specified is */
/*    the current core, this processing is skipped since the will give up */
/*    control subsequently on its own.                                    */
/*                                                                        */
/*  INPUT                                                                 */
/*                                                                        */
/*    core                                  The core to preempt           */
/*                                                                        */
/*  OUTPUT                                                                */
/*                                                                        */
/*    None                                                                */
/*                                                                        */
/*  CALLS                                                                 */
/*                                                                        */
/*    None                                                                */
/*                                                                        */
/*  CALLED BY                                                             */
/*                                                                        */
/*    ThreadX Source                                                      */
/*                                                                        */
/**************************************************************************/
    .globl  _tx_thread_smp_core_preempt
_tx_thread_smp_core_preempt:

    sync
    la      $8, GIC_SH_WEDGE                    # Build address
    li      $9, 0x80000020                      #
    addu    $9, $4, $9                          # Build exact VPE to interrupt
    sw      $9, 0($8)                           # Interrupt the selected VPE
    jr.hb   $31                                 # Return to caller
    nop                                         # Delay slot
