| /* 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 |
| |
