1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * linux/arch/arm/boot/compressed/head-xscale.S
4 *
5 * XScale specific tweaks. This is merged into head.S by the linker.
6 *
7 */
8
9#include <linux/linkage.h>
10
11 .section ".start", "ax"
12
13__XScale_start:
14
15 @ Preserve r8/r7 i.e. kernel entry values
16
17 @ Data cache might be active.
18 @ Be sure to flush kernel binary out of the cache,
19 @ whatever state it is, before it is turned off.
20 @ This is done by fetching through currently executed
21 @ memory to be sure we hit the same cache.
22 bic r2, pc, #0x1f
23 add r3, r2, #0x10000 @ 64 kb is quite enough...
241: ldr r0, [r2], #32
25 teq r2, r3
26 bne 1b
27 mcr p15, 0, r0, c7, c10, 4 @ drain WB
28 mcr p15, 0, r0, c7, c7, 0 @ flush I & D caches
29
30 @ disabling MMU and caches
31 mrc p15, 0, r0, c1, c0, 0 @ read control reg
32 bic r0, r0, #0x05 @ clear DC, MMU
33 bic r0, r0, #0x1000 @ clear Icache
34 mcr p15, 0, r0, c1, c0, 0
35
36

source code of linux/arch/arm/boot/compressed/head-xscale.S