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
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
|
/* SPDX-License-Identifier: GPL-2.0
*
* relocate_kernel.S - put the kernel image in place to boot
* 2005.9.17 kogiidena@eggplant.ddo.jp
*
* LANDISK/sh4 is supported. Maybe, SH archtecture works well.
*
* 2009-03-18 Magnus Damm - Added Kexec Jump support
*/
#include <linux/linkage.h>
#include <asm/addrspace.h>
#include <asm/page.h>
.globl relocate_new_kernel
relocate_new_kernel:
/* r4 = indirection_page */
/* r5 = reboot_code_buffer */
/* r6 = start_address */
mov.l 10f, r0 /* PAGE_SIZE */
add r5, r0 /* setup new stack at end of control page */
/* save r15->r8 to new stack */
mov.l r15, @-r0
mov r0, r15
mov.l r14, @-r15
mov.l r13, @-r15
mov.l r12, @-r15
mov.l r11, @-r15
mov.l r10, @-r15
mov.l r9, @-r15
mov.l r8, @-r15
/* save other random registers */
sts.l macl, @-r15
sts.l mach, @-r15
stc.l gbr, @-r15
stc.l ssr, @-r15
stc.l sr, @-r15
sts.l pr, @-r15
stc.l spc, @-r15
/* switch to bank1 and save r7->r0 */
mov.l 12f, r9
stc sr, r8
or r9, r8
ldc r8, sr
mov.l r7, @-r15
mov.l r6, @-r15
mov.l r5, @-r15
mov.l r4, @-r15
mov.l r3, @-r15
mov.l r2, @-r15
mov.l r1, @-r15
mov.l r0, @-r15
/* switch to bank0 and save r7->r0 */
mov.l 12f, r9
not r9, r9
stc sr, r8
and r9, r8
ldc r8, sr
mov.l r7, @-r15
mov.l r6, @-r15
mov.l r5, @-r15
mov.l r4, @-r15
mov.l r3, @-r15
mov.l r2, @-r15
mov.l r1, @-r15
mov.l r0, @-r15
mov.l r4, @-r15 /* save indirection page again */
bsr swap_pages /* swap pages before jumping to new kernel */
nop
mova 11f, r0
mov.l r15, @r0 /* save pointer to stack */
jsr @r6 /* hand over control to new kernel */
nop
mov.l 11f, r15 /* get pointer to stack */
mov.l @r15+, r4 /* restore r4 to get indirection page */
bsr swap_pages /* swap pages back to previous state */
nop
/* make sure bank0 is active and restore r0->r7 */
mov.l 12f, r9
not r9, r9
stc sr, r8
and r9, r8
ldc r8, sr
mov.l @r15+, r0
mov.l @r15+, r1
mov.l @r15+, r2
mov.l @r15+, r3
mov.l @r15+, r4
mov.l @r15+, r5
mov.l @r15+, r6
mov.l @r15+, r7
/* switch to bank1 and restore r0->r7 */
mov.l 12f, r9
stc sr, r8
or r9, r8
ldc r8, sr
mov.l @r15+, r0
mov.l @r15+, r1
mov.l @r15+, r2
mov.l @r15+, r3
mov.l @r15+, r4
mov.l @r15+, r5
mov.l @r15+, r6
mov.l @r15+, r7
/* switch back to bank0 */
mov.l 12f, r9
not r9, r9
stc sr, r8
and r9, r8
ldc r8, sr
/* restore other random registers */
ldc.l @r15+, spc
lds.l @r15+, pr
ldc.l @r15+, sr
ldc.l @r15+, ssr
ldc.l @r15+, gbr
lds.l @r15+, mach
lds.l @r15+, macl
/* restore r8->r15 */
mov.l @r15+, r8
mov.l @r15+, r9
mov.l @r15+, r10
mov.l @r15+, r11
mov.l @r15+, r12
mov.l @r15+, r13
mov.l @r15+, r14
mov.l @r15+, r15
rts
nop
swap_pages:
bra 1f
mov r4,r0 /* cmd = indirection_page */
0:
mov.l @r4+,r0 /* cmd = *ind++ */
1: /* addr = cmd & 0xfffffff0 */
mov r0,r2
mov #-16,r1
and r1,r2
/* if(cmd & IND_DESTINATION) dst = addr */
tst #1,r0
bt 2f
bra 0b
mov r2,r5
2: /* else if(cmd & IND_INDIRECTION) ind = addr */
tst #2,r0
bt 3f
bra 0b
mov r2,r4
3: /* else if(cmd & IND_DONE) return */
tst #4,r0
bt 4f
rts
nop
4: /* else if(cmd & IND_SOURCE) memcpy(dst,addr,PAGE_SIZE) */
tst #8,r0
bt 0b
mov.l 10f,r3 /* PAGE_SIZE */
shlr2 r3
shlr2 r3
5:
dt r3
/* regular kexec just overwrites the destination page
* with the contents of the source page.
* for the kexec jump case we need to swap the contents
* of the pages.
* to keep it simple swap the contents for both cases.
*/
mov.l @(0, r2), r8
mov.l @(0, r5), r1
mov.l r8, @(0, r5)
mov.l r1, @(0, r2)
mov.l @(4, r2), r8
mov.l @(4, r5), r1
mov.l r8, @(4, r5)
mov.l r1, @(4, r2)
mov.l @(8, r2), r8
mov.l @(8, r5), r1
mov.l r8, @(8, r5)
mov.l r1, @(8, r2)
mov.l @(12, r2), r8
mov.l @(12, r5), r1
mov.l r8, @(12, r5)
mov.l r1, @(12, r2)
add #16,r5
add #16,r2
bf 5b
bra 0b
nop
.align 2
10:
.long PAGE_SIZE
11:
.long 0
12:
.long 0x20000000 ! RB=1
relocate_new_kernel_end:
.globl relocate_new_kernel_size
relocate_new_kernel_size:
.long relocate_new_kernel_end - relocate_new_kernel
|
