/*-
 * Copyright (c) 2017-2018 QCM Technologies.
 * Copyright (c) 2017-2018 Semihalf.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include "assym.inc"

#include <machine/asm.h>

        .p2align 3
ENTRY(enter_idle_powerx)
        mfsprg0 %r3                     /* Get the pcpu pointer */
        ld      %r3,PC_CURTHREAD(%r3)   /* Get current thread */
        ld      %r3,TD_PCB(%r3)         /* Get PCB of current thread */
        std     %r12,PCB_CONTEXT(%r3)   /* Save the non-volatile GP regs. */
        std     %r13,PCB_CONTEXT+1*8(%r3)
        std     %r14,PCB_CONTEXT+2*8(%r3)
        std     %r15,PCB_CONTEXT+3*8(%r3)
        std     %r16,PCB_CONTEXT+4*8(%r3)
        std     %r17,PCB_CONTEXT+5*8(%r3)
        std     %r18,PCB_CONTEXT+6*8(%r3)
        std     %r19,PCB_CONTEXT+7*8(%r3)
        std     %r20,PCB_CONTEXT+8*8(%r3)
        std     %r21,PCB_CONTEXT+9*8(%r3)
        std     %r22,PCB_CONTEXT+10*8(%r3)
        std     %r23,PCB_CONTEXT+11*8(%r3)
        std     %r24,PCB_CONTEXT+12*8(%r3)
        std     %r25,PCB_CONTEXT+13*8(%r3)
        std     %r26,PCB_CONTEXT+14*8(%r3)
        std     %r27,PCB_CONTEXT+15*8(%r3)
        std     %r28,PCB_CONTEXT+16*8(%r3)
        std     %r29,PCB_CONTEXT+17*8(%r3)
        std     %r30,PCB_CONTEXT+18*8(%r3)
        std     %r31,PCB_CONTEXT+19*8(%r3)

        mfcr    %r16                    /* Save the condition register */
        std     %r16,PCB_CR(%r3)
        mflr    %r16                    /* Save the link register */
        std     %r16,PCB_LR(%r3)
        std     %r1,PCB_SP(%r3)         /* Save the stack pointer */
        std     %r2,PCB_TOC(%r3)        /* Save the TOC pointer */

        bl      1f
1:      mflr    %r3
        addi    %r3,%r3,power_save_sequence-1b
        mtsrr0  %r3

        /* Set MSR */
        li      %r3,0
#ifdef __LITTLE_ENDIAN__
        ori     %r3,%r3,(PSL_ME | PSL_RI | PSL_LE)
#else
        ori     %r3,%r3,(PSL_ME | PSL_RI)
#endif
        li      %r8,0x9                 /* PSL_SF and PSL_HV */
        insrdi  %r3,%r8,4,0
        mtsrr1  %r3

        rfid

        .p2align 2
power_save_sequence:
        bl      1f
        .llong  0x0                     /* Playground for power-save sequence */
1:      mflr    %r3

        /* Start power-save sequence */
        std     %r2,0(%r3)
        ptesync
        ld      %r2,0(%r3)
2:      cmpd    %r2,%r2
        bne     2b
        nap
        b       .
END(enter_idle_powerx)