/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 * PowerNV OPAL API wrappers
 *
 * Copyright 2011 IBM Corp.
 */

#include <linux/jump_label.h>
#include <asm/ppc_asm.h>
#include <asm/hvcall.h>
#include <asm/asm-offsets.h>
#include <asm/opal.h>
#include <asm/asm-compat.h>
#include <asm/feature-fixups.h>

        .section ".text"

/*
 * r3-r10               - OPAL call arguments
 * STK_PARAM(R11)       - OPAL opcode
 * STK_PARAM(R12)       - MSR to restore
 */
_GLOBAL_TOC(__opal_call)
        mflr    r0
        std     r0,PPC_LR_STKOFF(r1)
        ld      r12,STK_PARAM(R12)(r1)
        li      r0,MSR_IR|MSR_DR|MSR_LE
        andc    r12,r12,r0
        LOAD_REG_ADDR(r11, opal_return)
        mtlr    r11
        LOAD_REG_ADDR(r11, opal)
        ld      r2,0(r11)
        ld      r11,8(r11)
        mtspr   SPRN_HSRR0,r11
        mtspr   SPRN_HSRR1,r12
        /* set token to r0 */
        ld      r0,STK_PARAM(R11)(r1)
        hrfid
opal_return:
        /*
         * Restore MSR on OPAL return. The MSR is set to big-endian.
         */
#ifdef __BIG_ENDIAN__
        ld      r11,STK_PARAM(R12)(r1)
        mtmsrd  r11
#else
        /* Endian can only be switched with rfi, must byte reverse MSR load */
        .short 0x4039    /* li r10,STK_PARAM(R12)               */
        .byte (STK_PARAM(R12) >> 8) & 0xff
        .byte STK_PARAM(R12) & 0xff

        .long 0x280c6a7d /* ldbrx r11,r10,r1                    */
        .long 0x05009f42 /* bcl 20,31,$+4                       */
        .long 0xa602487d /* mflr r10                            */
        .long 0x14004a39 /* addi r10,r10,20                     */
        .long 0xa64b5a7d /* mthsrr0 r10                         */
        .long 0xa64b7b7d /* mthsrr1 r11                         */
        .long 0x2402004c /* hrfid                               */
#endif
        LOAD_PACA_TOC()
        ld      r0,PPC_LR_STKOFF(r1)
        mtlr    r0
        blr