1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * Copyright (c) 2016 IBM Corporation.
4 */
5
6#include "ppc_asm.h"
7#include "../include/asm/opal-api.h"
8
9	.text
10
11	.globl opal_kentry
12opal_kentry:
13	/* r3 is the fdt ptr */
14	mtctr r4
15	li	r4, 0
16	li	r5, 0
17	li	r6, 0
18	li	r7, 0
19	LOAD_REG_ADDR(r11, opal)
20	ld	r8,0(r11)
21	ld	r9,8(r11)
22	bctr
23
24#define OPAL_CALL(name, token)				\
25	.globl name;					\
26name:							\
27	li	r0, token;				\
28	b	opal_call;
29
30opal_call:
31	mflr	r11
32	std	r11,16(r1)
33	mfcr	r12
34	stw	r12,8(r1)
35	mr	r13,r2
36
37	/* Set opal return address */
38	LOAD_REG_ADDR(r11, opal_return)
39	mtlr	r11
40	mfmsr	r12
41
42	/* switch to BE when we enter OPAL */
43	li	r11,MSR_LE
44	andc	r12,r12,r11
45	mtspr	SPRN_HSRR1,r12
46
47	/* load the opal call entry point and base */
48	LOAD_REG_ADDR(r11, opal)
49	ld	r12,8(r11)
50	ld	r2,0(r11)
51	mtspr	SPRN_HSRR0,r12
52	hrfid
53
54opal_return:
55	FIXUP_ENDIAN
56	mr	r2,r13;
57	lwz	r11,8(r1);
58	ld	r12,16(r1)
59	mtcr	r11;
60	mtlr	r12
61	blr
62
63OPAL_CALL(opal_console_write,			OPAL_CONSOLE_WRITE);
64OPAL_CALL(opal_console_read,			OPAL_CONSOLE_READ);
65OPAL_CALL(opal_console_write_buffer_space,	OPAL_CONSOLE_WRITE_BUFFER_SPACE);
66OPAL_CALL(opal_poll_events,			OPAL_POLL_EVENTS);
67OPAL_CALL(opal_console_flush,			OPAL_CONSOLE_FLUSH);
68