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

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/*

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

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 *

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 * Board specific setup code, executed before zImage loader

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 */

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.text

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	#include <asm/page.h>

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	.global	romstart

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romstart:

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	/* include board specific setup code */

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#include <mach/romimage.h>

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#ifdef CONFIG_ROMIMAGE_MMCIF

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	/* load the romImage to above the empty zero page */

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	mov.l	empty_zero_page_dst, r4

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	mov.l	empty_zero_page_dst_adj, r5

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	add	r5, r4

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	mov.l	bytes_to_load, r5

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	mov.l	loader_function, r7

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	jsr	@r7

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	 mov	r4, r15

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	mov.l	empty_zero_page_dst, r4

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	mov.l	empty_zero_page_dst_adj, r5

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	add	r5, r4

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	mov.l	loaded_code_offs, r5

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	add	r5, r4

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	jmp	@r4

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	 nop

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	.balign 4

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empty_zero_page_dst_adj:

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	.long	PAGE_SIZE

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bytes_to_load:

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	.long	end_data - romstart

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loader_function:

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	.long	mmcif_loader

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loaded_code_offs:

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	.long	loaded_code - romstart

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loaded_code:

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#endif /* CONFIG_ROMIMAGE_MMCIF */

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	/* copy the empty_zero_page contents to where vmlinux expects it */

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	mova	extra_data_pos, r0

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	mov.l	extra_data_size, r1

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	add	r1, r0

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	mov.l	empty_zero_page_dst, r1

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	mov	#(PAGE_SHIFT - 4), r4

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	mov	#1, r3

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	shld	r4, r3 /* r3 = PAGE_SIZE / 16 */

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1:

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	mov.l	@r0, r4

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	mov.l	@(4, r0), r5

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	mov.l	@(8, r0), r6

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	mov.l	@(12, r0), r7

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	add	#16,r0

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	mov.l	r4, @r1

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	mov.l	r5, @(4, r1)

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	mov.l	r6, @(8, r1)

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	mov.l	r7, @(12, r1)

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	dt	r3

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	add	#16,r1

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	bf	1b

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	/* jump to the zImage entry point located after the zero page data */

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	mov	#PAGE_SHIFT, r4

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	mov	#1, r1

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	shld	r4, r1

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	mova	extra_data_pos, r0

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	add	r1, r0

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	mov.l	extra_data_size, r1

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	add	r1, r0

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	jmp	@r0

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	 nop

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	.align 2

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empty_zero_page_dst:

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	.long	_text

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extra_data_pos:

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extra_data_size:

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	.long	zero_page_pos - extra_data_pos

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