1/*
2 * arch/xtensa/boot/boot-elf/bootstrap.S
3 *
4 * Low-level exception handling
5 *
6 * This file is subject to the terms and conditions of the GNU General Public
7 * License.  See the file "COPYING" in the main directory of this archive
8 * for more details.
9 *
10 * Copyright (C) 2004 - 2013 by Tensilica Inc.
11 *
12 * Chris Zankel <chris@zankel.net>
13 * Marc Gauthier <marc@tensilica.com>
14 * Piet Delaney <piet@tensilica.com>
15 */
16
17#include <asm/bootparam.h>
18#include <asm/initialize_mmu.h>
19#include <asm/vectors.h>
20#include <linux/linkage.h>
21
22	.section	.ResetVector.text, "ax"
23	.global         _ResetVector
24	.global         reset
25
26_ResetVector:
27	_j _SetupMMU
28
29	.begin  no-absolute-literals
30	.literal_position
31
32#if defined(CONFIG_INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX) && \
33	XCHAL_HAVE_PTP_MMU && XCHAL_HAVE_SPANNING_WAY
34	.literal RomInitAddr, CONFIG_KERNEL_LOAD_ADDRESS
35#else
36	.literal RomInitAddr, KERNELOFFSET
37#endif
38#ifndef CONFIG_PARSE_BOOTPARAM
39	.literal RomBootParam, 0
40#else
41	.literal RomBootParam, _bootparam
42
43	.align 4
44_bootparam:
45	.short	BP_TAG_FIRST
46	.short	4
47	.long	BP_VERSION
48	.short	BP_TAG_LAST
49	.short	0
50	.long	0
51#endif
52
53	.align  4
54_SetupMMU:
55	movi	a0, 0
56	wsr	a0, windowbase
57	rsync
58	movi	a0, 1
59	wsr	a0, windowstart
60	rsync
61	movi	a0, 0x1F
62	wsr	a0, ps
63	rsync
64
65#ifndef CONFIG_INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX
66	initialize_mmu
67#endif
68
69	.end    no-absolute-literals
70
71	rsil    a0, XCHAL_DEBUGLEVEL-1
72	rsync
73reset:
74	l32r    a0, RomInitAddr
75	l32r	a2, RomBootParam
76	movi	a3, 0
77	movi	a4, 0
78	jx      a0
79