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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/powerpc/platforms/powernv/opal-wrappers.S
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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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	LOAD_PACA_TOC()

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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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