1/* 2 * linux/arch/arm/boot/compressed/head-xscale.S 3 * 4 * XScale specific tweaks. This is merged into head.S by the linker. 5 * 6 */ 7 8#include <linux/linkage.h> 9 10 .section ".start", "ax" 11 12__XScale_start: 13 14 @ Preserve r8/r7 i.e. kernel entry values 15 16 @ Data cache might be active. 17 @ Be sure to flush kernel binary out of the cache, 18 @ whatever state it is, before it is turned off. 19 @ This is done by fetching through currently executed 20 @ memory to be sure we hit the same cache. 21 bic r2, pc, #0x1f 22 add r3, r2, #0x10000 @ 64 kb is quite enough... 231: ldr r0, [r2], #32 24 teq r2, r3 25 bne 1b 26 mcr p15, 0, r0, c7, c10, 4 @ drain WB 27 mcr p15, 0, r0, c7, c7, 0 @ flush I & D caches 28 29 @ disabling MMU and caches 30 mrc p15, 0, r0, c1, c0, 0 @ read control reg 31 bic r0, r0, #0x05 @ clear DC, MMU 32 bic r0, r0, #0x1000 @ clear Icache 33 mcr p15, 0, r0, c1, c0, 0 34 35