1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * PowerNV OPAL API wrappers
4 *
5 * Copyright 2011 IBM Corp.
6 */
7
8#include <linux/jump_label.h>
9#include <asm/ppc_asm.h>
10#include <asm/hvcall.h>
11#include <asm/asm-offsets.h>
12#include <asm/opal.h>
13#include <asm/asm-compat.h>
14#include <asm/feature-fixups.h>
15
16	.section ".text"
17
18/*
19 * r3-r10		- OPAL call arguments
20 * STK_PARAM(R11)	- OPAL opcode
21 * STK_PARAM(R12)	- MSR to restore
22 */
23_GLOBAL_TOC(__opal_call)
24	mflr	r0
25	std	r0,PPC_LR_STKOFF(r1)
26	ld	r12,STK_PARAM(R12)(r1)
27	li	r0,MSR_IR|MSR_DR|MSR_LE
28	andc	r12,r12,r0
29	LOAD_REG_ADDR(r11, opal_return)
30	mtlr	r11
31	LOAD_REG_ADDR(r11, opal)
32	ld	r2,0(r11)
33	ld	r11,8(r11)
34	mtspr	SPRN_HSRR0,r11
35	mtspr	SPRN_HSRR1,r12
36	/* set token to r0 */
37	ld	r0,STK_PARAM(R11)(r1)
38	hrfid
39opal_return:
40	/*
41	 * Restore MSR on OPAL return. The MSR is set to big-endian.
42	 */
43#ifdef __BIG_ENDIAN__
44	ld	r11,STK_PARAM(R12)(r1)
45	mtmsrd	r11
46#else
47	/* Endian can only be switched with rfi, must byte reverse MSR load */
48	.short 0x4039	 /* li r10,STK_PARAM(R12)		*/
49	.byte (STK_PARAM(R12) >> 8) & 0xff
50	.byte STK_PARAM(R12) & 0xff
51
52	.long 0x280c6a7d /* ldbrx r11,r10,r1			*/
53	.long 0x05009f42 /* bcl 20,31,$+4			*/
54	.long 0xa602487d /* mflr r10				*/
55	.long 0x14004a39 /* addi r10,r10,20			*/
56	.long 0xa64b5a7d /* mthsrr0 r10				*/
57	.long 0xa64b7b7d /* mthsrr1 r11				*/
58	.long 0x2402004c /* hrfid				*/
59#endif
60	ld	r2,PACATOC(r13)
61	ld	r0,PPC_LR_STKOFF(r1)
62	mtlr	r0
63	blr
64