standby.s

Windows CE 6.0 BSP for VOIPAC Board (PXA270) Version 2b.

//
// Copyright (c) Microsoft Corporation.  All rights reserved.
//
//
// Use of this source code is subject to the terms of the Microsoft end-user
// license agreement (EULA) under which you licensed this SOFTWARE PRODUCT.
// If you did not accept the terms of the EULA, you are not authorized to use
// this source code. For a copy of the EULA, please see the LICENSE.RTF on your
// install media.
//
#include <kxmips.h>

//------------------------------------------------------------------------------
//
// Function:     VOID OALCPUPowerOff()
//
// This function set VR4131 SoC to standby mode. Interrupt from CP0
// count/compare counter is dissabled to avoid incorrect wakeup.
//

LEAF_ENTRY(OALCPUPowerOff)

        .set    noreorder
        .set    noat

        addu    sp, -0x18
        sw      ra, 0x10(sp)

        jal     INTERRUPTS_ON
        nop

        mfc0    t0, psr
        li      t1, 0xFFFF7FFF
        and     t1, t0
        mtc0    t1, psr
        nop

	.word	0x42000021		// standby

        jal     INTERRUPTS_OFF
        nop
       
        lw      ra, 0x10(sp)
        addu    sp, 0x18

        j       ra
        nop
        
        .set    at
        .set    reorder
        .end    OALCPUPowerOff

//------------------------------------------------------------------------------