64 lines
1.4 KiB
ArmAsm
64 lines
1.4 KiB
ArmAsm
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/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* PowerNV OPAL API wrappers
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*
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* Copyright 2011 IBM Corp.
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*/
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#include <linux/jump_label.h>
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#include <asm/ppc_asm.h>
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#include <asm/hvcall.h>
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#include <asm/asm-offsets.h>
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#include <asm/opal.h>
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#include <asm/asm-compat.h>
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#include <asm/feature-fixups.h>
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.section ".text"
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/*
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* r3-r10 - OPAL call arguments
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* STK_PARAM(R11) - OPAL opcode
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* STK_PARAM(R12) - MSR to restore
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*/
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_GLOBAL_TOC(__opal_call)
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mflr r0
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std r0,PPC_LR_STKOFF(r1)
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ld r12,STK_PARAM(R12)(r1)
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li r0,MSR_IR|MSR_DR|MSR_LE
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andc r12,r12,r0
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LOAD_REG_ADDR(r11, opal_return)
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mtlr r11
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LOAD_REG_ADDR(r11, opal)
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ld r2,0(r11)
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ld r11,8(r11)
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mtspr SPRN_HSRR0,r11
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mtspr SPRN_HSRR1,r12
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/* set token to r0 */
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ld r0,STK_PARAM(R11)(r1)
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hrfid
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opal_return:
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/*
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* Restore MSR on OPAL return. The MSR is set to big-endian.
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*/
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#ifdef __BIG_ENDIAN__
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ld r11,STK_PARAM(R12)(r1)
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mtmsrd r11
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#else
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/* Endian can only be switched with rfi, must byte reverse MSR load */
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.short 0x4039 /* li r10,STK_PARAM(R12) */
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.byte (STK_PARAM(R12) >> 8) & 0xff
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.byte STK_PARAM(R12) & 0xff
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.long 0x280c6a7d /* ldbrx r11,r10,r1 */
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.long 0x05009f42 /* bcl 20,31,$+4 */
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.long 0xa602487d /* mflr r10 */
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.long 0x14004a39 /* addi r10,r10,20 */
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.long 0xa64b5a7d /* mthsrr0 r10 */
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.long 0xa64b7b7d /* mthsrr1 r11 */
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.long 0x2402004c /* hrfid */
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#endif
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ld r2,PACATOC(r13)
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ld r0,PPC_LR_STKOFF(r1)
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mtlr r0
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blr
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