aboutsummaryrefslogtreecommitdiffstats
path: root/arch/frv/kernel/head-uc-fr451.S
blob: b10d9c8295d21fd854aa91ab0fedc8ff2d71ede8 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
/* head-uc-fr451.S: FR451 uc-linux specific bits of initialisation
 *
 * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */

#include <linux/threads.h>
#include <linux/linkage.h>
#include <asm/ptrace.h>
#include <asm/page.h>
#include <asm/spr-regs.h>
#include <asm/mb86943a.h>
#include "head.inc"


#define __400_DBR0	0xfe000e00
#define __400_DBR1	0xfe000e08
#define __400_DBR2	0xfe000e10
#define __400_DBR3	0xfe000e18
#define __400_DAM0	0xfe000f00
#define __400_DAM1	0xfe000f08
#define __400_DAM2	0xfe000f10
#define __400_DAM3	0xfe000f18
#define __400_LGCR	0xfe000010
#define __400_LCR	0xfe000100
#define __400_LSBR	0xfe000c00

	.section	.text.init,"ax"
	.balign		4

###############################################################################
#
# set the protection map with the I/DAMPR registers
#
#	ENTRY:			EXIT:
# GR25	SDRAM size		[saved]
# GR26	&__head_reference	[saved]
# GR30	LED address		[saved]
#
###############################################################################
	.globl		__head_fr451_set_protection
__head_fr451_set_protection:
	movsg		lr,gr27

	movgs		gr0,dampr10
	movgs		gr0,damlr10
	movgs		gr0,dampr9
	movgs		gr0,damlr9
	movgs		gr0,dampr8
	movgs		gr0,damlr8

	# set the I/O region protection registers for FR401/3/5
	sethi.p		%hi(__region_IO),gr5
	setlo		%lo(__region_IO),gr5
	sethi.p		%hi(0x1fffffff),gr7
	setlo		%lo(0x1fffffff),gr7
	ori		gr5,#xAMPRx_SS_512Mb|xAMPRx_S_KERNEL|xAMPRx_C|xAMPRx_V,gr5
	movgs		gr5,dampr11			; General I/O tile
	movgs		gr7,damlr11

	# need to tile the remaining IAMPR/DAMPR registers to cover as much of the RAM as possible
	# - start with the highest numbered registers
	sethi.p		%hi(__kernel_image_end),gr8
	setlo		%lo(__kernel_image_end),gr8
	sethi.p		%hi(32768),gr4			; allow for a maximal allocator bitmap
	setlo		%lo(32768),gr4
	add		gr8,gr4,gr8
	sethi.p		%hi(1024*2048-1),gr4		; round up to nearest 2MiB
	setlo		%lo(1024*2048-1),gr4
	add.p		gr8,gr4,gr8
	not		gr4,gr4
	and		gr8,gr4,gr8

	sethi.p		%hi(__page_offset),gr9
	setlo		%lo(__page_offset),gr9
	add		gr9,gr25,gr9

	sethi.p		%hi(0xffffc000),gr11
	setlo		%lo(0xffffc000),gr11

	# GR8 = base of uncovered RAM
	# GR9 = top of uncovered RAM
	# GR11 = xAMLR mask
	LEDS		0x3317
	call		__head_split_region
	movgs		gr4,iampr7
	movgs		gr6,iamlr7
	movgs		gr5,dampr7
	movgs		gr7,damlr7

	LEDS		0x3316
	call		__head_split_region
	movgs		gr4,iampr6
	movgs		gr6,iamlr6
	movgs		gr5,dampr6
	movgs		gr7,damlr6

	LEDS		0x3315
	call		__head_split_region
	movgs		gr4,iampr5
	movgs		gr6,iamlr5
	movgs		gr5,dampr5
	movgs		gr7,damlr5

	LEDS		0x3314
	call		__head_split_region
	movgs		gr4,iampr4
	movgs		gr6,iamlr4
	movgs		gr5,dampr4
	movgs		gr7,damlr4

	LEDS		0x3313
	call		__head_split_region
	movgs		gr4,iampr3
	movgs		gr6,iamlr3
	movgs		gr5,dampr3
	movgs		gr7,damlr3

	LEDS		0x3312
	call		__head_split_region
	movgs		gr4,iampr2
	movgs		gr6,iamlr2
	movgs		gr5,dampr2
	movgs		gr7,damlr2

	LEDS		0x3311
	call		__head_split_region
	movgs		gr4,iampr1
	movgs		gr6,iamlr1
	movgs		gr5,dampr1
	movgs		gr7,damlr1

	# cover kernel core image with kernel-only segment
	LEDS		0x3310
	sethi.p		%hi(__page_offset),gr8
	setlo		%lo(__page_offset),gr8
	call		__head_split_region

#ifdef CONFIG_PROTECT_KERNEL
	ori.p		gr4,#xAMPRx_S_KERNEL,gr4
	ori		gr5,#xAMPRx_S_KERNEL,gr5
#endif

	movgs		gr4,iampr0
	movgs		gr6,iamlr0
	movgs		gr5,dampr0
	movgs		gr7,damlr0

	# start in TLB context 0 with no page tables
	movgs		gr0,cxnr
	movgs		gr0,ttbr

	# the FR451 also has an extra trap base register
	movsg		tbr,gr4
	movgs		gr4,btbr

	# turn on the timers as appropriate
	movgs		gr0,timerh
	movgs		gr0,timerl
	movgs		gr0,timerd
	movsg		hsr0,gr4
	sethi.p		%hi(HSR0_ETMI),gr5
	setlo		%lo(HSR0_ETMI),gr5
	or		gr4,gr5,gr4
	movgs		gr4,hsr0

	LEDS		0x3300
	jmpl		@(gr27,gr0)