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1da177e4 LT |
1 | /* |
2 | * linux/arch/arm/boot/compressed/head-sa1100.S | |
3 | * | |
2f82af08 | 4 | * Copyright (C) 1999 Nicolas Pitre <nico@fluxnic.net> |
1da177e4 LT |
5 | * |
6 | * SA1100 specific tweaks. This is merged into head.S by the linker. | |
7 | * | |
8 | */ | |
9 | ||
1da177e4 LT |
10 | #include <linux/linkage.h> |
11 | #include <asm/mach-types.h> | |
12 | ||
13 | .section ".start", "ax" | |
14 | ||
15 | __SA1100_start: | |
16 | ||
17 | @ Preserve r8/r7 i.e. kernel entry values | |
18 | #ifdef CONFIG_SA1100_COLLIE | |
19 | mov r7, #MACH_TYPE_COLLIE | |
20 | #endif | |
21 | #ifdef CONFIG_SA1100_SIMPAD | |
22 | @ UNTIL we've something like an open bootldr | |
23 | mov r7, #MACH_TYPE_SIMPAD @should be 87 | |
24 | #endif | |
25 | mrc p15, 0, r0, c1, c0, 0 @ read control reg | |
26 | ands r0, r0, #0x0d | |
27 | beq 99f | |
28 | ||
29 | @ Data cache might be active. | |
30 | @ Be sure to flush kernel binary out of the cache, | |
31 | @ whatever state it is, before it is turned off. | |
32 | @ This is done by fetching through currently executed | |
33 | @ memory to be sure we hit the same cache. | |
34 | bic r2, pc, #0x1f | |
35 | add r3, r2, #0x4000 @ 16 kb is quite enough... | |
36 | 1: ldr r0, [r2], #32 | |
37 | teq r2, r3 | |
38 | bne 1b | |
39 | mcr p15, 0, r0, c7, c10, 4 @ drain WB | |
40 | mcr p15, 0, r0, c7, c7, 0 @ flush I & D caches | |
41 | ||
42 | @ disabling MMU and caches | |
43 | mrc p15, 0, r0, c1, c0, 0 @ read control reg | |
44 | bic r0, r0, #0x0d @ clear WB, DC, MMU | |
45 | bic r0, r0, #0x1000 @ clear Icache | |
46 | mcr p15, 0, r0, c1, c0, 0 | |
47 | 99: |