[net-next-2.6.git] / arch / cris / arch-v10 / boot / compressed / head.S

/*
 *  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.
 *
 */

#define ASSEMBLER_MACROS_ONLY
#include <asm/arch/sv_addr_ag.h>

#define RAM_INIT_MAGIC 0x56902387
#define COMMAND_LINE_MAGIC 0x87109563

	;; 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, $r2	; end destination
1:	move.w	[$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, $r2
1:	move.w	$r0, [$r1+]
	cmp.d	$r2, $r1
	bcs	1b
	nop

	;;  Save command line magic and address.
	move.d	_cmd_line_magic, $r12
	move.d  $r10, [$r12]
	move.d	_cmd_line_addr, $r12
	move.d  $r11, [$r12]

	;; 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

	;; Restore command line magic and address.
	move.d  _cmd_line_magic, $r10
	move.d  [$r10], $r10
	move.d  _cmd_line_addr, $r11
	move.d  [$r11], $r11

	;; 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
_cmd_line_magic:
	.dword 0
_cmd_line_addr:
	.dword 0
#include "../../lib/hw_settings.S"
Commit	Line	Data
1da177e4 LT	1	/*
	2	* arch/cris/boot/compressed/head.S
	3	*
	4	* Copyright (C) 1999, 2001 Axis Communications AB
	5	*
	6	* Code that sets up the DRAM registers, calls the
	7	* decompressor to unpack the piggybacked kernel, and jumps.
	8	*
	9	*/
	10
1da177e4 LT	11	#define ASSEMBLER_MACROS_ONLY
	12	#include <asm/arch/sv_addr_ag.h>
	13
	14	#define RAM_INIT_MAGIC 0x56902387
7cf32cad MS	15	#define COMMAND_LINE_MAGIC 0x87109563
7cf32cad MS	16
1da177e4	17	;; Exported symbols
1da177e4	18
bdb144b6 JN	19	.globl input_data
	20
	21
1da177e4 LT	22	.text
	23
	24	nop
	25	di
	26
	27	;; We need to initialze DRAM registers before we start using the DRAM
bdb144b6 JN	28
bdb144b6 JN	29	cmp.d RAM_INIT_MAGIC, $r8 ; Already initialized?
1da177e4 LT	30	beq dram_init_finished
1da177e4 LT	31	nop
bdb144b6	32
1da177e4	33	#include "../../lib/dram_init.S"
bdb144b6 JN	34
	35	dram_init_finished:
	36
1da177e4 LT	37	;; Initiate the PA and PB ports
1da177e4 LT	38
bdb144b6 JN	39	move.b CONFIG_ETRAX_DEF_R_PORT_PA_DATA, $r0
bdb144b6 JN	40	move.b $r0, [R_PORT_PA_DATA]
1da177e4	41
bdb144b6 JN	42	move.b CONFIG_ETRAX_DEF_R_PORT_PA_DIR, $r0
bdb144b6 JN	43	move.b $r0, [R_PORT_PA_DIR]
1da177e4	44
bdb144b6 JN	45	move.b CONFIG_ETRAX_DEF_R_PORT_PB_DATA, $r0
bdb144b6 JN	46	move.b $r0, [R_PORT_PB_DATA]
1da177e4	47
bdb144b6 JN	48	move.b CONFIG_ETRAX_DEF_R_PORT_PB_DIR, $r0
bdb144b6 JN	49	move.b $r0, [R_PORT_PB_DIR]
1da177e4 LT	50
	51	;; Setup the stack to a suitably high address.
	52	;; We assume 8 MB is the minimum DRAM in an eLinux
	53	;; product and put the sp at the top for now.
	54
bdb144b6	55	move.d 0x40800000, $sp
1da177e4 LT	56
	57	;; Figure out where the compressed piggyback image is
	58	;; in the flash (since we wont try to copy it to DRAM
	59	;; before unpacking). It is at _edata, but in flash.
	60	;; Use (_edata - basse) as offset to the current PC.
bdb144b6 JN	61
	62	basse: move.d $pc, $r5
	63	and.d 0x7fffffff, $r5 ; strip any non-cache bit
	64	subq 2, $r5 ; compensate for the move.d $pc instr
	65	move.d $r5, $r0 ; save for later - flash address of 'basse'
	66	add.d _edata, $r5
	67	sub.d basse, $r5 ; $r5 = flash address of '_edata'
	68
1da177e4	69	;; Copy text+data to DRAM
bdb144b6 JN	70
	71	move.d basse, $r1 ; destination
	72	move.d _edata, $r2 ; end destination
	73	1: move.w [$r0+], $r3
	74	move.w $r3, [$r1+]
	75	cmp.d $r2, $r1
1da177e4 LT	76	bcs 1b
	77	nop
	78
bdb144b6	79	move.d $r5, [input_data] ; for the decompressor
1da177e4 LT	80
	81
	82	;; Clear the decompressors BSS (between _edata and _end)
bdb144b6 JN	83
	84	moveq 0, $r0
	85	move.d _edata, $r1
	86	move.d _end, $r2
	87	1: move.w $r0, [$r1+]
	88	cmp.d $r2, $r1
1da177e4 LT	89	bcs 1b
1da177e4 LT	90	nop
7cf32cad MS	91
	92	;; Save command line magic and address.
	93	move.d _cmd_line_magic, $r12
	94	move.d $r10, [$r12]
	95	move.d _cmd_line_addr, $r12
	96	move.d $r11, [$r12]
1da177e4	97
bdb144b6 JN	98	;; Do the decompression and save compressed size in inptr
	99
	100	jsr decompress_kernel
	101
	102	;; Put start address of root partition in $r9 so the kernel can use it
1da177e4 LT	103	;; when mounting from flash
1da177e4 LT	104
bdb144b6 JN	105	move.d [input_data], $r9 ; flash address of compressed kernel
bdb144b6 JN	106	add.d [inptr], $r9 ; size of compressed kernel
7cf32cad MS	107
	108	;; Restore command line magic and address.
	109	move.d _cmd_line_magic, $r10
	110	move.d [$r10], $r10
	111	move.d _cmd_line_addr, $r11
	112	move.d [$r11], $r11
	113
1da177e4	114	;; Enter the decompressed kernel
bdb144b6	115	move.d RAM_INIT_MAGIC, $r8 ; Tell kernel that DRAM is initialized
1da177e4	116	jump 0x40004000 ; kernel is linked to this address
bdb144b6	117
1da177e4 LT	118	.data
1da177e4 LT	119
bdb144b6	120	input_data:
1da177e4	121	.dword 0 ; used by the decompressor
7cf32cad MS	122	_cmd_line_magic:
	123	.dword 0
	124	_cmd_line_addr:
	125	.dword 0
1da177e4	126	#include "../../lib/hw_settings.S"