46 lines
1.1 KiB
ArmAsm
46 lines
1.1 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* linux/arch/arm/boot/compressed/head-sa1100.S
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*
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* Copyright (C) 1999 Nicolas Pitre <nico@fluxnic.net>
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*
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* SA1100 specific tweaks. This is merged into head.S by the linker.
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*
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*/
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#include <linux/linkage.h>
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#include <asm/mach-types.h>
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.section ".start", "ax"
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.arch armv4
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__SA1100_start:
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@ Preserve r8/r7 i.e. kernel entry values
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#ifdef CONFIG_SA1100_COLLIE
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mov r7, #MACH_TYPE_COLLIE
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#endif
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mrc p15, 0, r0, c1, c0, 0 @ read control reg
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ands r0, r0, #0x0d
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beq 99f
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@ Data cache might be active.
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@ Be sure to flush kernel binary out of the cache,
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@ whatever state it is, before it is turned off.
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@ This is done by fetching through currently executed
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@ memory to be sure we hit the same cache.
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bic r2, pc, #0x1f
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add r3, r2, #0x4000 @ 16 kb is quite enough...
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1: ldr r0, [r2], #32
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teq r2, r3
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bne 1b
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mcr p15, 0, r0, c7, c10, 4 @ drain WB
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mcr p15, 0, r0, c7, c7, 0 @ flush I & D caches
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@ disabling MMU and caches
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mrc p15, 0, r0, c1, c0, 0 @ read control reg
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bic r0, r0, #0x0d @ clear WB, DC, MMU
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bic r0, r0, #0x1000 @ clear Icache
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mcr p15, 0, r0, c1, c0, 0
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99:
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