Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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kernel
os
linux
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/processor.h>
19#include <asm/pgtable.h>
20#include <asm/page.h>
21#include <asm/cacheasm.h>
22#include <asm/initialize_mmu.h>
23#include <linux/linkage.h>
24
25 .section .ResetVector.text, "ax"
26 .global _ResetVector
27 .global reset
28
29_ResetVector:
30 _j _SetupMMU
31
32 .begin no-absolute-literals
33 .literal_position
34
35 .align 4
36RomInitAddr:
37#if defined(CONFIG_INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX) && \
38 XCHAL_HAVE_PTP_MMU && XCHAL_HAVE_SPANNING_WAY
39 .word 0x00003000
40#else
41 .word 0xd0003000
42#endif
43RomBootParam:
44 .word _bootparam
45_bootparam:
46 .short BP_TAG_FIRST
47 .short 4
48 .long BP_VERSION
49 .short BP_TAG_LAST
50 .short 0
51 .long 0
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 Offset = _SetupMMU - _ResetVector
66
67#ifndef CONFIG_INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX
68 initialize_mmu
69#endif
70
71 .end no-absolute-literals
72
73 rsil a0, XCHAL_DEBUGLEVEL-1
74 rsync
75reset:
76 l32r a0, RomInitAddr
77 l32r a2, RomBootParam
78 movi a3, 0
79 movi a4, 0
80 jx a0
81
82 .align 4
83
84 .section .ResetVector.remapped_text, "x"
85 .global _RemappedResetVector
86
87 /* Do org before literals */
88 .org 0
89
90_RemappedResetVector:
91 .begin no-absolute-literals
92 .literal_position
93
94 _j _RemappedSetupMMU
95
96 /* Position Remapped code at the same location as the original code */
97 . = _RemappedResetVector + Offset
98
99_RemappedSetupMMU:
100#ifndef CONFIG_INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX
101 initialize_mmu
102#endif
103
104 .end no-absolute-literals