[linux-2.6-block.git] / arch / arm / boot / compressed / head-clps7500.S

/*
 * linux/arch/arm/boot/compressed/head-clps7500.S
 *
 * Copyright (C) 1999, 2000, 2001 Nexus Electronics Ltd
 */


		/* There are three different ways the kernel can be
		   booted on a 7500 system: from Angel (loaded in RAM), from
		   16-bit ROM or from 32-bit Flash.  Luckily, a single kernel
		   image does for them all. */
		/* This branch is taken if the CPU memory width matches the
		   actual device in use.  The default at power on is 16 bits
		   so we must be prepared for a mismatch. */
		.section ".start", "ax"
2:
		b	1f
		.word	0xffff
		.word	0xb632		@ mov r11, #0x03200000
		.word	0xe3a0
		.word	0x0000		@ mov r0, #0
		.word	0xe3a0
		.word	0x0080		@ strb r0, [r11, #0x80]
		.word	0xe5cb
		.word	0xf000		@ mov pc, #0
		.word	0xe3a0
1:
		adr	r1, 2b
		teq	r1, #0
		bne	.Langel
		/* This is a direct-from-ROM boot.  Copy the kernel into 
		   RAM and run it there. */
		mov	r0, #0x30
		mcr	p15, 0, r0, c1, c0, 0
		mov	r0, #0x13
		msr	cpsr_cxsf, r0
		mov	r12, #0x03000000	@ point to LEDs
		orr	r12, r12, #0x00020000
		orr	r12, r12, #0xba00
		mov	r0, #0x5500
		str	r0, [r12]
		mov	r0, #0x10000000
		orr	r0, r0, #0x8000
		mov	r4, r0
		ldr	r2, =_end
2:
		ldr	r3, [r1], #4
		str	r3, [r0], #4
		teq	r0, r2
		bne	2b
		mov	r0, #0xff00
		str	r0, [r12]
1:	
		mov	r12, #0x03000000	@ point to LEDs
		orr	r12, r12, #0x00020000
		orr	r12, r12, #0xba00
		mov	r0, #0xfe00
		str	r0, [r12]

		adr	lr, 1f
		mov	r0, #0
		mov	r1, #14		/* MACH_TYPE_CLPS7500 */
		mov	pc, lr
.Langel:
#ifdef CONFIG_ANGELBOOT
		/* Call Angel to switch into SVC mode. */
		mov	r0, #0x17
		swi	0x123456
#endif
		/* Ensure all interrupts are off and MMU disabled */
		mrs	r0, cpsr
		orr	r0, r0, #0xc0
		msr	cpsr_cxsf, r0

		adr	lr, 1b
		orr	lr, lr, #0x10000000
		mov	r0, #0x30		@ MMU off
		mcr	p15, 0, r0, c1, c0, 0
		mov	r0, r0
	 	mov	pc, lr

		.ltorg

1:
/* And the rest */
#include "head.S"
Commit	Line	Data
1da177e4	1	/*
f30c2269	2	* linux/arch/arm/boot/compressed/head-clps7500.S
1da177e4 LT	3	*
	4	* Copyright (C) 1999, 2000, 2001 Nexus Electronics Ltd
	5	*/
	6
1da177e4 LT	7
	8	/* There are three different ways the kernel can be
	9	booted on a 7500 system: from Angel (loaded in RAM), from
	10	16-bit ROM or from 32-bit Flash. Luckily, a single kernel
	11	image does for them all. */
	12	/* This branch is taken if the CPU memory width matches the
	13	actual device in use. The default at power on is 16 bits
	14	so we must be prepared for a mismatch. */
	15	.section ".start", "ax"
	16	2:
	17	b 1f
	18	.word 0xffff
	19	.word 0xb632 @ mov r11, #0x03200000
	20	.word 0xe3a0
	21	.word 0x0000 @ mov r0, #0
	22	.word 0xe3a0
	23	.word 0x0080 @ strb r0, [r11, #0x80]
	24	.word 0xe5cb
	25	.word 0xf000 @ mov pc, #0
	26	.word 0xe3a0
	27	1:
	28	adr r1, 2b
	29	teq r1, #0
	30	bne .Langel
	31	/* This is a direct-from-ROM boot. Copy the kernel into
	32	RAM and run it there. */
	33	mov r0, #0x30
	34	mcr p15, 0, r0, c1, c0, 0
	35	mov r0, #0x13
	36	msr cpsr_cxsf, r0
	37	mov r12, #0x03000000 @ point to LEDs
	38	orr r12, r12, #0x00020000
	39	orr r12, r12, #0xba00
	40	mov r0, #0x5500
	41	str r0, [r12]
	42	mov r0, #0x10000000
	43	orr r0, r0, #0x8000
	44	mov r4, r0
	45	ldr r2, =_end
	46	2:
	47	ldr r3, [r1], #4
	48	str r3, [r0], #4
	49	teq r0, r2
	50	bne 2b
	51	mov r0, #0xff00
	52	str r0, [r12]
	53	1:
	54	mov r12, #0x03000000 @ point to LEDs
	55	orr r12, r12, #0x00020000
	56	orr r12, r12, #0xba00
	57	mov r0, #0xfe00
	58	str r0, [r12]
	59
	60	adr lr, 1f
	61	mov r0, #0
	62	mov r1, #14 /* MACH_TYPE_CLPS7500 */
	63	mov pc, lr
	64	.Langel:
	65	#ifdef CONFIG_ANGELBOOT
	66	/* Call Angel to switch into SVC mode. */
	67	mov r0, #0x17
	68	swi 0x123456
	69	#endif
	70	/* Ensure all interrupts are off and MMU disabled */
71	mrs r0, cpsr
72	orr r0, r0, #0xc0
73	msr cpsr_cxsf, r0
74
75	adr lr, 1b
76	orr lr, lr, #0x10000000
77	mov r0, #0x30 @ MMU off
78	mcr p15, 0, r0, c1, c0, 0
79	mov r0, r0
80	mov pc, lr
81
82	.ltorg
83
84	1:
85	/* And the rest */
86	#include "head.S"