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1 | /* |
2 | * The head-file for SH-Mobile ARM platforms | |
3 | * | |
4 | * Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> | |
5 | * Simon Horman <horms@verge.net.au> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; version 2 of the License. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
19 | */ | |
20 | ||
21 | #ifdef CONFIG_ZBOOT_ROM | |
22 | ||
23 | .section ".start", "ax" | |
24 | ||
25 | /* load board-specific initialization code */ | |
26 | #include <mach/zboot.h> | |
27 | ||
2c408d14 MD |
28 | adr r0, dtb_info |
29 | ldmia r0, {r1, r3, r4, r5, r7} | |
30 | ||
31 | sub r0, r0, r1 @ calculate the delta offset | |
32 | add r5, r5, r0 @ _edata | |
33 | ||
34 | ldr lr, [r5, #0] @ check if valid DTB is present | |
35 | cmp lr, r3 | |
36 | bne 0f | |
37 | ||
38 | add r9, r7, #31 @ rounded up to a multiple | |
39 | bic r9, r9, #31 @ ... of 32 bytes | |
40 | ||
41 | add r6, r9, r5 @ copy from _edata | |
42 | add r9, r9, r4 @ to MEMORY_START | |
43 | ||
44 | 1: ldmdb r6!, {r0 - r3, r10 - r12, lr} | |
45 | cmp r6, r5 | |
46 | stmdb r9!, {r0 - r3, r10 - r12, lr} | |
47 | bhi 1b | |
48 | ||
49 | /* Success: Zero board ID, pointer to start of memory for atag/dtb */ | |
50 | mov r7, #0 | |
51 | mov r8, r4 | |
9a4af112 KM |
52 | b 2f |
53 | ||
2c408d14 MD |
54 | .align 2 |
55 | dtb_info: | |
56 | .word dtb_info | |
57 | #ifndef __ARMEB__ | |
58 | .word 0xedfe0dd0 @ sig is 0xd00dfeed big endian | |
59 | #else | |
60 | .word 0xd00dfeed | |
61 | #endif | |
62 | .word MEMORY_START | |
63 | .word _edata | |
64 | .word 0x4000 @ maximum DTB size | |
65 | 0: | |
66 | /* Failure: Zero board ID, NULL atag/dtb */ | |
67 | mov r7, #0 | |
68 | mov r8, #0 @ pass null pointer as atag | |
9a4af112 KM |
69 | 2 : |
70 | ||
71 | #endif /* CONFIG_ZBOOT_ROM */ |