1*b2441318SGreg Kroah-Hartman/* SPDX-License-Identifier: GPL-2.0 */ 21da177e4SLinus Torvalds/* 31da177e4SLinus Torvalds * linux/arch/arm/boot/compressed/head-sa1100.S 41da177e4SLinus Torvalds * 52f82af08SNicolas Pitre * Copyright (C) 1999 Nicolas Pitre <nico@fluxnic.net> 61da177e4SLinus Torvalds * 71da177e4SLinus Torvalds * SA1100 specific tweaks. This is merged into head.S by the linker. 81da177e4SLinus Torvalds * 91da177e4SLinus Torvalds */ 101da177e4SLinus Torvalds 111da177e4SLinus Torvalds#include <linux/linkage.h> 121da177e4SLinus Torvalds#include <asm/mach-types.h> 131da177e4SLinus Torvalds 141da177e4SLinus Torvalds .section ".start", "ax" 15da94a829SArnd Bergmann .arch armv4 161da177e4SLinus Torvalds 171da177e4SLinus Torvalds__SA1100_start: 181da177e4SLinus Torvalds 191da177e4SLinus Torvalds @ Preserve r8/r7 i.e. kernel entry values 201da177e4SLinus Torvalds#ifdef CONFIG_SA1100_COLLIE 211da177e4SLinus Torvalds mov r7, #MACH_TYPE_COLLIE 221da177e4SLinus Torvalds#endif 231da177e4SLinus Torvalds mrc p15, 0, r0, c1, c0, 0 @ read control reg 241da177e4SLinus Torvalds ands r0, r0, #0x0d 251da177e4SLinus Torvalds beq 99f 261da177e4SLinus Torvalds 271da177e4SLinus Torvalds @ Data cache might be active. 281da177e4SLinus Torvalds @ Be sure to flush kernel binary out of the cache, 291da177e4SLinus Torvalds @ whatever state it is, before it is turned off. 301da177e4SLinus Torvalds @ This is done by fetching through currently executed 311da177e4SLinus Torvalds @ memory to be sure we hit the same cache. 321da177e4SLinus Torvalds bic r2, pc, #0x1f 331da177e4SLinus Torvalds add r3, r2, #0x4000 @ 16 kb is quite enough... 341da177e4SLinus Torvalds1: ldr r0, [r2], #32 351da177e4SLinus Torvalds teq r2, r3 361da177e4SLinus Torvalds bne 1b 371da177e4SLinus Torvalds mcr p15, 0, r0, c7, c10, 4 @ drain WB 381da177e4SLinus Torvalds mcr p15, 0, r0, c7, c7, 0 @ flush I & D caches 391da177e4SLinus Torvalds 401da177e4SLinus Torvalds @ disabling MMU and caches 411da177e4SLinus Torvalds mrc p15, 0, r0, c1, c0, 0 @ read control reg 421da177e4SLinus Torvalds bic r0, r0, #0x0d @ clear WB, DC, MMU 431da177e4SLinus Torvalds bic r0, r0, #0x1000 @ clear Icache 441da177e4SLinus Torvalds mcr p15, 0, r0, c1, c0, 0 451da177e4SLinus Torvalds99: 46