Subversion Repositories freemyipod

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@    Copyright 2010 TheSeven

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@    This file is part of emCORE.

@

@    emCORE is free software: you can redistribute it and/or

@    modify it under the terms of the GNU General Public License as

@    published by the Free Software Foundation, either version 2 of the

@    License, or (at your option) any later version.

@

@    emCORE is distributed in the hope that it will be useful,

@    but WITHOUT ANY WARRANTY; without even the implied warranty of

@    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

@    See the GNU General Public License for more details.

@

@    You should have received a copy of the GNU General Public License

@    along with emCORE.  If not, see <http://www.gnu.org/licenses/>.

@

@

.section .intvect,"ax",%progbits

	ldr pc, =reset_handler

	ldr pc, =undef_instr_handler

	ldr pc, =syscall_handler

	ldr pc, =prefetch_abort_handler

	ldr pc, =data_abort_handler

	ldr pc, =reserved_handler

	ldr pc, =irq_handler

	ldr pc, =fiq_handler

.ltorg

.section .inithead,"ax",%progbits

.global __start

__start:

	b	_start

.section .initcode,"ax",%progbits

.global _start

_start:

	mrc	p15, 0, r0,c1,c0

	bic	r0, r0, #0x200

	orr	r0, r0, #0x100

	mcr	p15, 0, r0,c1,c0

	mov	r0, #0x7fffffff

	mcr	p15, 0, r0,c3,c0

	mov	r0, #0x22000000

	orr	r1, r0, #0x00000100

	orr	r0, r0, #0x0003c000

	orr	r1, r1, #0x000000fe

	add	r2, r0, #0x200

	mov	r3, #0

	str	r1, [r0], #4

.mmuloop1:

	str	r3, [r0], #4

	cmp	r0, r2

	bne	.mmuloop1

	add	r0, r0, #0x080

	add	r2, r0, #0x580

.mmuloop2:

	str	r3, [r0], #4

	cmp	r0, r2

	bne	.mmuloop2

	add	r0, r0, #0x4

	add	r2, r0, #0x7c

.mmuloop3:

	str	r3, [r0], #4

	cmp	r0, r2

	bne	.mmuloop3

	add	r0, r0, #0x4

	add	r2, r0, #0x500

	add	r2, r2, #0x7c

.mmuloop4:

	str	r3, [r0], #4

	cmp	r0, r2

	bne	.mmuloop4

	add	r0, r0, #0x200

	add	r2, r0, #0x3000

.mmuloop5:

	str	r3, [r0], #4

	cmp	r0, r2

	bne	.mmuloop5

	mrc	p15, 0, r0,c1,c0

	orr	r0, r0, #5

	orr	r0, r0, #0x400000

	mcr	p15, 0, r0,c1,c0

	ldr	r0, =_sramsource

	ldr	r1, =_sramstart

	ldr	r2, =_sramend

.copysram:

	cmp	r2, r1

	ldrhi	r3, [r0], #4

	strhi	r3, [r1], #4

	bhi	.copysram

	ldr	r0, =_sdramsource

	ldr	r1, =_sdramstart

	ldr	r2, =_sdramend

.copysdram:

	cmp	r2, r1

	ldrhi	r3, [r0], #4

	strhi	r3, [r1], #4

	bhi	.copysdram

	ldr	r0, =_ibssstart

	ldr	r1, =_ibssend

	mov	r2, #0

.clearibss:

	cmp	r1, r0

	strhi	r2, [r0], #4

	bhi	.clearibss

	ldr	r0, =_bssstart

	ldr	r1, =_bssend

.clearbss:

	cmp	r1, r0

	strhi	r2, [r0], #4

	bhi	.clearbss

	mov	r0, #0

	mcr	p15, 0, r0,c7,c10,0 @ clean data cache

	mcr	p15, 0, r0,c7,c10,4 @ drain write buffer

	mcr	p15, 0, r0,c7,c5,0  @ invalidate instruction cache

	mcr	p15, 0, r0,c7,c5,4  @ flush prefetch buffer

	ldr	r1, =0x38e00000

	add	r2, r1, #0x00001000

	add	r3, r1, #0x00002000

	mov	r4, #-1

	str	r4, [r1,#0x14]

	str	r4, [r2,#0x14]

	str	r4, [r1,#0xf00]

	str	r4, [r2,#0xf00]

	str	r4, [r3,#0x08]

	str	r4, [r3,#0x0c]

	msr	cpsr_c, #0xd2

	ldr	sp, =_irqstackend

	msr	cpsr_c, #0xd7

	ldr	sp, =_abortstackend

	msr	cpsr_c, #0xdb

	ldr	sp, =_abortstackend

	msr	cpsr_c, #0x1f

	ldr	sp, =_abortstackend

	bl	init

	bl	yield

	mov	r0, #0

	ldr	pc, =idleloop

.ltorg

.section .icode, "ax", %progbits

.align 2

idleloop:

	mcr	p15, 0, r0,c7,c0,4

	b	idleloop

.global reset

.global hang

.type reset, %function

.type hang, %function

reset:

	msr	cpsr_c, #0xd3

	mov	r0, #0x100000

	mov	r1, #0x3c800000

	str	r0, [r1]

hang:

	msr	cpsr_c, #0xd3

	mov	r0, #0

	mcr	p15, 0, r0,c7,c0,4

	b	hang

.size reset, .-reset

.size hang, .-hang

.type reset_handler, %function

reset_handler:

	stmfd	sp, {r10-r12}

	mov	r10, sp

	mov	r11, lr

	mrs	r12, cpsr

	msr	cpsr_c, #0xd7

	sub	sp, sp, #0x44

	stmia	sp!, {r0-r9}

	sub	r0, r10, #0xc

	ldmia	r0, {r0-r2}

	mov	r3, r10

	mov	r4, r11

	mov	r5, r11

	mov	r6, r12

	stmia	sp!, {r0-r6}

	sub	sp, sp, #0x44

	mov	r0, #0

	adr	r1, reset_text

	mov	r2, r11

	b	panic

.size reset_handler, .-reset_handler

.global undef_instr_handler

.type undef_instr_handler, %function

undef_instr_handler:

	sub	sp, sp, #0x44

	stmia	sp!, {r0-r12}

	sub	r2, lr, #4

	mrs	r3, spsr

	mrs	r4, cpsr

	orr	r0, r3, #0xc0

	msr	cpsr_c, r0

	mov	r0, sp

	mov	r1, lr

	msr	cpsr_c, r4

	stmia	sp!, {r0-r3}

	sub	sp, sp, #0x44

	mov	r0, #0

	adr	r1, undef_instr_text

	ldr	r3, [r2]

	b	panicf

.size undef_instr_handler, .-undef_instr_handler

.type prefetch_abort_handler, %function

prefetch_abort_handler:

	sub	sp, sp, #0x44

	stmia	sp!, {r0-r12}

	sub	r2, lr, #4

	mrs	r3, spsr

	mrs	r4, cpsr

	orr	r0, r3, #0xc0

	msr	cpsr_c, r0

	mov	r0, sp

	mov	r1, lr

	msr	cpsr_c, r4

	stmia	sp!, {r0-r3}

	sub	sp, sp, #0x44

	mov	r0, #0

	adr	r1, prefetch_abort_text

	mrc	p15, 0, r3,c5,c0

	mov	r4, r3,lsr#4

	and	r4, r4, #0xf

	and	r5, r3, #0xf

	stmfd	sp!, {r4-r5}

	b	panicf

.size prefetch_abort_handler, .-prefetch_abort_handler

.type data_abort_handler, %function

data_abort_handler:

	sub	sp, sp, #0x44

	stmia	sp!, {r0-r12}

	sub	r2, lr, #8

	mrs	r3, spsr

	mrs	r4, cpsr

	orr	r0, r3, #0xc0

	msr	cpsr_c, r0

	mov	r0, sp

	mov	r1, lr

	msr	cpsr_c, r4

	stmia	sp!, {r0-r3}

	sub	sp, sp, #0x44

	mov	r0, #0

	adr	r1, data_abort_text

	mrc	p15, 0, r3,c5,c0

	mov	r4, r3,lsr#4

	and	r4, r4, #0xf

	and	r5, r3, #0xf

	mrc	p15, 0, r6,c6,c0

	stmfd	sp!, {r4-r6}

	b	panicf

.size data_abort_handler, .-data_abort_handler

.type reserved_handler, %function

reserved_handler:

	stmfd	sp, {r10-r12}

	mov	r10, sp

	mov	r11, lr

	mrs	r12, cpsr

	msr	cpsr_c, #0xd7

	sub	sp, sp, #0x44

	stmia	sp!, {r0-r9}

	sub	r0, r10, #0xc

	ldmia	r0, {r0-r2}

	mov	r3, r10

	mov	r4, r11

	mov	r5, r11

	mov	r6, r12

	stmia	sp!, {r0-r6}

	sub	sp, sp, #0x44

	mov	r0, #0

	adr	r1, reserved_text

	mov	r2, r11

	b	panic

.size reserved_handler, .-reserved_handler

.type fiq_handler, %function

fiq_handler:

	mov	r0, #2

	adr	r1, fiq_text

	b	panic

.size fiq_handler, .-fiq_handler

prefetch_abort_text:

	.ascii	"Prefetch abort at %08X!\nFSR: %08X (domain %d, fault %d)\0"

reset_text:

	.ascii	"Hit reset vector!\n(Last known PC: %08X)\0"

undef_instr_text:

	.ascii	"Undefined instruction at %08X!\n(Opcode: %08X)\0"

data_abort_text:

	.ascii	"Data abort at %08X!\nFSR: %08X (domain %d, fault %d)\nAddress: %08X\0"

fiq_text:

	.ascii	"Unhandled FIQ!\0"

reserved_text:

	.ascii	"Hit reserved exception handler!\n(Last known PC: %08X)\0"

syscall_text:

	.ascii	"Unhandled syscall!\0"

.section .icode.usec_timer, "ax", %progbits

.align 2

.global read_native_timer

.type read_native_timer, %function

read_native_timer:

	ldr	r0, val_3c700000

	ldr	r1, [r0,#0x80]

	ldr	r0, [r0,#0x84]

	bx	lr

.size read_native_timer, .-read_native_timer

.global read_usec_timer

.type read_usec_timer, %function

read_usec_timer:

	ldr	r0, val_3c700000

	ldr	r0, [r0,#0xb4]

	bx	lr

.size read_usec_timer, .-read_usec_timer

val_3c700000:

	.word	0x3c700000