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
|
/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* arch/shmedia/boot/compressed/head.S
*
* Copied from
* arch/shmedia/kernel/head.S
* which carried the copyright:
* Copyright (C) 2000, 2001 Paolo Alberelli
*
* Modification for compressed loader:
* Copyright (C) 2002 Stuart Menefy (stuart.menefy@st.com)
*/
#include <linux/linkage.h>
#include <asm/registers.h>
#include <asm/cache.h>
#include <asm/mmu_context.h>
/*
* Fixed TLB entries to identity map the beginning of RAM
*/
#define MMUIR_TEXT_H 0x0000000000000003 | CONFIG_MEMORY_START
/* Enabled, Shared, ASID 0, Eff. Add. 0xA0000000 */
#define MMUIR_TEXT_L 0x000000000000009a | CONFIG_MEMORY_START
/* 512 Mb, Cacheable (Write-back), execute, Not User, Ph. Add. */
#define MMUDR_CACHED_H 0x0000000000000003 | CONFIG_MEMORY_START
/* Enabled, Shared, ASID 0, Eff. Add. 0xA0000000 */
#define MMUDR_CACHED_L 0x000000000000015a | CONFIG_MEMORY_START
/* 512 Mb, Cacheable (Write-back), read/write, Not User, Ph. Add. */
#define ICCR0_INIT_VAL ICCR0_ON | ICCR0_ICI /* ICE + ICI */
#define ICCR1_INIT_VAL ICCR1_NOLOCK /* No locking */
#if 1
#define OCCR0_INIT_VAL OCCR0_ON | OCCR0_OCI | OCCR0_WB /* OCE + OCI + WB */
#else
#define OCCR0_INIT_VAL OCCR0_OFF
#endif
#define OCCR1_INIT_VAL OCCR1_NOLOCK /* No locking */
.text
.global startup
startup:
/*
* Prevent speculative fetch on device memory due to
* uninitialized target registers.
* This must be executed before the first branch.
*/
ptabs/u ZERO, tr0
ptabs/u ZERO, tr1
ptabs/u ZERO, tr2
ptabs/u ZERO, tr3
ptabs/u ZERO, tr4
ptabs/u ZERO, tr5
ptabs/u ZERO, tr6
ptabs/u ZERO, tr7
synci
/*
* Set initial TLB entries for cached and uncached regions.
* Note: PTA/BLINK is PIC code, PTABS/BLINK isn't !
*/
/* Clear ITLBs */
pta 1f, tr1
movi ITLB_FIXED, r21
movi ITLB_LAST_VAR_UNRESTRICTED+TLB_STEP, r22
1: putcfg r21, 0, ZERO /* Clear MMUIR[n].PTEH.V */
addi r21, TLB_STEP, r21
bne r21, r22, tr1
/* Clear DTLBs */
pta 1f, tr1
movi DTLB_FIXED, r21
movi DTLB_LAST_VAR_UNRESTRICTED+TLB_STEP, r22
1: putcfg r21, 0, ZERO /* Clear MMUDR[n].PTEH.V */
addi r21, TLB_STEP, r21
bne r21, r22, tr1
/* Map one big (512Mb) page for ITLB */
movi ITLB_FIXED, r21
movi MMUIR_TEXT_L, r22 /* PTEL first */
putcfg r21, 1, r22 /* Set MMUIR[0].PTEL */
movi MMUIR_TEXT_H, r22 /* PTEH last */
putcfg r21, 0, r22 /* Set MMUIR[0].PTEH */
/* Map one big CACHED (512Mb) page for DTLB */
movi DTLB_FIXED, r21
movi MMUDR_CACHED_L, r22 /* PTEL first */
putcfg r21, 1, r22 /* Set MMUDR[0].PTEL */
movi MMUDR_CACHED_H, r22 /* PTEH last */
putcfg r21, 0, r22 /* Set MMUDR[0].PTEH */
/* ICache */
movi ICCR_BASE, r21
movi ICCR0_INIT_VAL, r22
movi ICCR1_INIT_VAL, r23
putcfg r21, ICCR_REG0, r22
putcfg r21, ICCR_REG1, r23
synci
/* OCache */
movi OCCR_BASE, r21
movi OCCR0_INIT_VAL, r22
movi OCCR1_INIT_VAL, r23
putcfg r21, OCCR_REG0, r22
putcfg r21, OCCR_REG1, r23
synco
/*
* Enable the MMU.
* From here-on code can be non-PIC.
*/
movi SR_HARMLESS | SR_ENABLE_MMU, r22
putcon r22, SSR
movi 1f, r22
putcon r22, SPC
synco
rte /* And now go into the hyperspace ... */
1: /* ... that's the next instruction ! */
/* Set initial stack pointer */
movi datalabel stack_start, r0
ld.l r0, 0, r15
/*
* Clear bss
*/
pt 1f, tr1
movi datalabel __bss_start, r22
movi datalabel _end, r23
1: st.l r22, 0, ZERO
addi r22, 4, r22
bne r22, r23, tr1
/*
* Decompress the kernel.
*/
pt decompress_kernel, tr0
blink tr0, r18
/*
* Disable the MMU.
*/
movi SR_HARMLESS, r22
putcon r22, SSR
movi 1f, r22
putcon r22, SPC
synco
rte /* And now go into the hyperspace ... */
1: /* ... that's the next instruction ! */
/* Jump into the decompressed kernel */
movi datalabel (CONFIG_MEMORY_START + 0x2000)+1, r19
ptabs r19, tr0
blink tr0, r18
/* Shouldn't return here, but just in case, loop forever */
pt 1f, tr0
1: blink tr0, ZERO
|
