arm/kernel/head-nommu.S

1 /* SPDX-License-Identifier: GPL-2.0-only */
3  *  linux/arch/arm/kernel/head-nommu.S
5  *  Copyright (C) 1994-2002 Russell King
6  *  Copyright (C) 2003-2006 Hyok S. Choi
8  *  Common kernel startup code (non-paged MM)
16 #include <asm/asm-offsets.h>
26  * ---------------------------
29  * are: MMU = off, D-cache = off, I-cache = dont care, r0 = 0,
32  * See linux/arch/arm/tools/mach-types for the complete list of machine
47  THUMB(	bx	r9		)	@ If this is a Thumb-2 kernel,
89 	 * the processor type - there is no need to check the machine type
166 	biceq	r0, r0, #CR_BR			@ Disable the 'default mem-map'
221 /* Setup a single MPU region, either D or I side (D-side for unified) */
244  * Region 1: Background region - covers the whole of RAM as strongly ordered
279 	/* Determine whether the D/I-side memory map is unified. We set the
285 	tst	r0, #MPUIR_nU			@ MPUIR_nU = 0 for unified
295 	beq	1f					@ Memory-map not unified
308 	beq	2f					@ Memory-map not unified
327 	beq	3f					@ Memory-map not unified
344 	bic	r6, r6, #(PMSAv8_MINALIGN - 1)
358 	bic	r6, r6, #(PMSAv8_MINALIGN - 1)
368 	/* Setup Background: 0x0 - min(KERNEL_START, XIP_PHYS_ADDR) */
382 	bic	r6, r6, #(PMSAv8_MINALIGN - 1)
393 	/* Setup Background: max(KERNEL_END, _exiprom) - 0xffffffff */
403 	bic	r6, r6, #(PMSAv8_MINALIGN - 1)
414 	/* Setup Background: min(_exiprom, KERNEL_END) - max(KERNEL_START, XIP_PHYS_ADDR) */
426 	bic	r6, r6, #(PMSAv8_MINALIGN - 1)
471 	/* Determine whether the D/I-side memory map is unified. We set the
483 	tst	r0, #MPUIR_nU			@ MPUIR_nU = 0 for unified
535 #include "head-common.S"