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
| /* SPDX-License-Identifier: GPL-2.0 */
| /*
| * linux/arch/arm/boot/compressed/head-xscale.S
| *
| * XScale specific tweaks. This is merged into head.S by the linker.
| *
| */
|
| #include <linux/linkage.h>
|
| .section ".start", "ax"
|
| __XScale_start:
|
| @ Preserve r8/r7 i.e. kernel entry values
|
| @ Data cache might be active.
| @ Be sure to flush kernel binary out of the cache,
| @ whatever state it is, before it is turned off.
| @ This is done by fetching through currently executed
| @ memory to be sure we hit the same cache.
| bic r2, pc, #0x1f
| add r3, r2, #0x10000 @ 64 kb is quite enough...
| 1: ldr r0, [r2], #32
| teq r2, r3
| bne 1b
| mcr p15, 0, r0, c7, c10, 4 @ drain WB
| mcr p15, 0, r0, c7, c7, 0 @ flush I & D caches
|
| @ disabling MMU and caches
| mrc p15, 0, r0, c1, c0, 0 @ read control reg
| bic r0, r0, #0x05 @ clear DC, MMU
| bic r0, r0, #0x1000 @ clear Icache
| mcr p15, 0, r0, c1, c0, 0
|
|
