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... 24 1: 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