/* *  arch/cris/boot/compressed/head.S * *  Copyright (C) 1999, 2001 Axis Communications AB * *  Code that sets up the DRAM registers, calls the *  decompressor to unpack the piggybacked kernel, and jumps. * */#include <linux/config.h>#define ASSEMBLER_MACROS_ONLY#include <asm/arch/sv_addr_ag.h>#define RAM_INIT_MAGIC 0x56902387		;; Exported symbols		.globl	_input_data		.text	nop	di;; We need to initialze DRAM registers before we start using the DRAM		cmp.d	RAM_INIT_MAGIC, r8	; Already initialized?	beq	dram_init_finished	nop	#include "../../lib/dram_init.S"	dram_init_finished:				;; Initiate the PA and PB ports	move.b   CONFIG_ETRAX_DEF_R_PORT_PA_DATA, r0	move.b   r0, [R_PORT_PA_DATA]	move.b   CONFIG_ETRAX_DEF_R_PORT_PA_DIR, r0	move.b   r0, [R_PORT_PA_DIR]	move.b   CONFIG_ETRAX_DEF_R_PORT_PB_DATA, r0	move.b   r0, [R_PORT_PB_DATA]	move.b   CONFIG_ETRAX_DEF_R_PORT_PB_DIR, r0	move.b   r0, [R_PORT_PB_DIR]	;; Setup the stack to a suitably high address.	;; We assume 8 MB is the minimum DRAM in an eLinux	;; product and put the sp at the top for now.	move.d	0x40800000, sp	;; Figure out where the compressed piggyback image is	;; in the flash (since we wont try to copy it to DRAM	;; before unpacking). It is at _edata, but in flash.	;; Use (_edata - basse) as offset to the current PC.	basse:	move.d	pc, r5	and.d	0x7fffffff, r5	; strip any non-cache bit	subq	2, r5		; compensate for the move.d pc instr	move.d	r5, r0		; save for later - flash address of 'basse'	add.d	_edata, r5	sub.d	basse, r5	; r5 = flash address of '_edata'		;; Copy text+data to DRAM		move.d	basse, r1	; destination	move.d	_edata, r2	; end destination1:	move.w	[r0+], r3	move.w	r3, [r1+]	cmp.d	r2, r1	bcs	1b	nop	move.d	r5, [_input_data] ; for the decompressor	;; Clear the decompressors BSS (between _edata and _end)		moveq	0, r0	move.d	_edata, r1	move.d	_end, r21:	move.w	r0, [r1+]	cmp.d	r2, r1	bcs	1b	nop		;; Do the decompression and save compressed size in _inptr	jsr	_decompress_kernel		;; Put start address of root partition in r9 so the kernel can use it	;; when mounting from flash	move.d	[_input_data], r9	; flash address of compressed kernel	add.d	[_inptr], r9		; size of compressed kernel	 	;; Enter the decompressed kernel	move.d	RAM_INIT_MAGIC, r8	; Tell kernel that DRAM is initialized	jump	0x40004000	; kernel is linked to this address		.data_input_data:	.dword	0		; used by the decompressor#include "../../lib/hw_settings.S"