/* *  linux/arch/arm/boot/bootp/init.S * *  Copyright (C) 2000 Russell King * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * *  Header file for splitting kernel + initrd.  Note that we pass *  r0 through to r3 straight through. */		.section .start,#alloc,#execinstr		.type	_entry, #function_entry:		adr	r10, initdata		ldr	r11, initdata		sub	r11, r10, r11		@ work out exec offset		b	splitify		.size	_entry,. - _entry		.type	initdata, #objectinitdata:	.word	initdata		@ compiled address of this		.size	initdata,. - initdata		.textsplitify:	adr	r13, data		ldmia	r13!, {r4-r6}		@ move the initrd		add	r4, r4, r11		@ correction		bl	move		ldmia	r13!, {r4-r6}		@ then the kernel		mov	r12, r5		add	r4, r4, r11		@ correction		bl	move/* * Setup the initrd parameters to pass to the kernel.  This can either be * passed in via a param_struct or a tag list.  We spot the param_struct * method by looking at the first word; this should either indicate a page * size of 4K, 16K or 32K. */		ldmia	r13, {r4-r8}		@ get size and addr of initrd						@ r5 = ATAG_INITRD						@ r6 = initrd start						@ r7 = initrd end						@ r8 = param_struct address		ldr	r9, [r8, #0]		@ no param struct?		teq	r9, #0x1000		@ 4K?		teqne	r9, #0x4000		@ 16K?		teqne	r9, #0x8000		@ 32K?		beq	param_struct		ldr	r9, [r8, #4]		@ get first tag		teq	r9, r4		bne	taglist			@ ok, we have a tag list/* * We didn't find a valid tag list - create one. */		str	r4, [r8, #4]		mov	r4, #8		str	r4, [r8, #0]		mov	r4, #0		str	r4, [r8, #8]/* * find the end of the tag list, and then add an INITRD tag on the end. * If there is already an INITRD tag, then we ignore it; the last INITRD * tag takes precidence. */taglist:	ldr	r9, [r8, #0]		@ tag length		teq	r9, #0			@ last tag?		addne	r8, r8, r9		bne	taglist		mov	r4, #16			@ length of initrd tag		mov	r9, #0			@ end of tag list terminator		stmia	r8, {r4, r5, r6, r7, r9}		mov	pc, r12			@ call kernel/* * We found a param struct.  Modify the param struct for the initrd */param_struct:	add	r8, r8, #16*4		stmia	r8, {r6,r7}		@ save in param_struct		mov	pc, r12			@ call kernelmove:		ldmia	r4!, {r7 - r10}		@ move 32-bytes at a time		stmia	r5!, {r7 - r10}		ldmia	r4!, {r7 - r10}		stmia	r5!, {r7 - r10}		subs	r6, r6, #8 * 4		bcs	move		mov	pc, lrdata:		.word	initrd_start		.word	initrd_addr		.word	initrd_len		.word	kernel_start		.word	kernel_addr		.word	kernel_len		.word	0x54410001		@ r4 = ATAG_CORE		.word	0x54420005		@ r5 = ATAG_INITRD		.word	initrd_addr		@ r6		.word	initrd_len		@ r7		.word	params			@ r8		.type	kernel_start,#object		.type	initrd_start,#object