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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/sh/boot/compressed/head_32.S
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/* SPDX-License-Identifier: GPL-2.0 */

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/*

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 *  linux/arch/sh/boot/compressed/head.S

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 *

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 *  Copyright (C) 1999 Stuart Menefy

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 *  Copyright (C) 2003 SUGIOKA Toshinobu

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 */

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.text

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#include <asm/page.h>

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	.global	startup

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startup:

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	/* Load initial status register */

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	mov.l   init_sr, r1

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	ldc     r1, sr

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	/* Move myself to proper location if necessary */

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	mova	1f, r0

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	mov.l	1f, r2

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	cmp/eq	r2, r0

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	bt	clear_bss

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	sub	r0, r2

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	mov.l	bss_start_addr, r0

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	mov	#0xffffffe0, r1

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	and	r1, r0			! align cache line

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	mov.l	text_start_addr, r3

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	mov	r0, r1

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	sub	r2, r1

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3:

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	mov.l	@r1, r4

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	mov.l	@(4,r1), r5

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	mov.l	@(8,r1), r6

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	mov.l	@(12,r1), r7

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	mov.l	@(16,r1), r8

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	mov.l	@(20,r1), r9

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	mov.l	@(24,r1), r10

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	mov.l	@(28,r1), r11

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	mov.l	r4, @r0

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	mov.l	r5, @(4,r0)

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	mov.l	r6, @(8,r0)

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	mov.l	r7, @(12,r0)

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	mov.l	r8, @(16,r0)

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	mov.l	r9, @(20,r0)

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	mov.l	r10, @(24,r0)

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	mov.l	r11, @(28,r0)

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#ifdef CONFIG_CPU_SH4

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	ocbwb	@r0

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#endif

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	cmp/hi	r3, r0

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	add	#-32, r0

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	bt/s	3b

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	 add	#-32, r1

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	mov.l	2f, r0

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	jmp	@r0

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	 nop

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	.align 2

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1:	.long	1b

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2:	.long	clear_bss

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text_start_addr:

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	.long	startup

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	/* Clear BSS */

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clear_bss:

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	mov.l	end_addr, r1

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	mov.l	bss_start_addr, r2

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	mov	#0, r0

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l1:

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	mov.l	r0, @-r1

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	cmp/eq	r1,r2

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	bf	l1

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	/* Set the initial pointer. */

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	mov.l	init_stack_addr, r0

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	mov.l	@r0, r15

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	/* Decompress the kernel */

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	mov.l	decompress_kernel_addr, r0

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	jsr	@r0

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	nop

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	/* Jump to the start of the decompressed kernel */

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	mov.l	kernel_start_addr, r0

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	jmp	@r0

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	nop

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	.align	2

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bss_start_addr:

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	.long	__bss_start

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end_addr:

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	.long	_end

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init_sr:

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	.long	0x500000F0	/* Privileged mode, Bank=0, Block=1, IMASK=0xF */

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kexec_magic:

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	.long	0x400000F0	/* magic used by kexec to parse zImage format */

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init_stack_addr:

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	.long	stack_start

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decompress_kernel_addr:

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	.long	decompress_kernel

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kernel_start_addr:

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#ifdef CONFIG_32BIT

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	.long	___pa(_text+PAGE_SIZE)

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#else

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	.long	_text+PAGE_SIZE

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#endif

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	.align	9

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fake_headers_as_bzImage:

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	.word	0

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	.ascii	"HdrS"		! header signature

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	.word	0x0202		! header version number (>= 0x0105)

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				! or else old loadlin-1.5 will fail)

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	.word	0		! default_switch

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	.word	0		! SETUPSEG

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	.word	0x1000

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	.word	0		! pointing to kernel version string

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	.byte	0		! = 0, old one (LILO, Loadlin,

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				! 0xTV: T=0 for LILO

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				!       V = version

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	.byte	1		! Load flags bzImage=1

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	.word	0x8000		! size to move, when setup is not

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	.long	0x100000	! 0x100000 = default for big kernel

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	.long	0		! address of loaded ramdisk image

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	.long	0		# its size in bytes

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