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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/m68k/platform/68328/head-rom.S
10819 views
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	.global _start

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	.global _stext

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	.global _rambase

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	.global _ramvec

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	.global _ramstart

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	.global _ramend

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#ifdef CONFIG_INIT_LCD

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	.global splash_bits

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#endif

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	.data

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/*

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 *      Set up the usable of RAM stuff. Size of RAM is determined then

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 *      an initial stack set up at the end.

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 */

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.align 4

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_ramvec:

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.long   0

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_rambase:

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.long   0

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_ramstart:

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.long   0

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_ramend:

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.long   0

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#define	RAMEND	(CONFIG_RAMBASE + CONFIG_RAMSIZE)

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#ifdef CONFIG_INIT_LCD

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splash_bits:

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#include "bootlogo.rh"

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#endif

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	.text

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_start:

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_stext:	movew	#0x2700,%sr

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#ifdef CONFIG_INIT_LCD

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	movel	#splash_bits, 0xfffffA00 /* LSSA */

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	moveb	#0x28,   0xfffffA05	/* LVPW */

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	movew	#0x280,  0xFFFFFa08	/* LXMAX */

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	movew	#0x1df,  0xFFFFFa0a	/* LYMAX */

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	moveb	#0,      0xfffffa29	/* LBAR */

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	moveb	#0,      0xfffffa25	/* LPXCD */

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	moveb	#0x08,   0xFFFFFa20	/* LPICF */

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	moveb	#0x01,   0xFFFFFA21	/* -ve pol */

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	moveb	#0x81,   0xfffffA27	/* LCKCON */

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	movew	#0xff00, 0xfffff412	/* LCD pins */

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#endif

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	moveal  #RAMEND-CONFIG_MEMORY_RESERVE*0x100000 - 0x10, %sp

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	movew	#32767, %d0  /* PLL settle wait loop */

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1:	subq	#1, %d0

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	bne	1b

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	/* Copy data segment from ROM to RAM */

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	moveal	#_etext, %a0

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	moveal	#_sdata, %a1

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	moveal	#_edata, %a2

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	/* Copy %a0 to %a1 until %a1 == %a2 */

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1:	movel	%a0@+, %a1@+

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	cmpal	%a1, %a2

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	bhi	1b

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	moveal	#_sbss, %a0

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	moveal	#_ebss, %a1

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	/* Copy 0 to %a0 until %a0 == %a1 */

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1:

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	clrl	%a0@+

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	cmpal	%a0, %a1

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	bhi	1b

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        movel   #_sdata, %d0    

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        movel   %d0, _rambase        

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        movel   #_ebss, %d0

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        movel   %d0, _ramstart

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	movel	#RAMEND-CONFIG_MEMORY_RESERVE*0x100000, %d0

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	movel	%d0, _ramend

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	movel	#CONFIG_VECTORBASE,	%d0

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	movel	%d0, _ramvec

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/*

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 * load the current task pointer and stack

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 */

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	lea	init_thread_union, %a0

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	lea	0x2000(%a0), %sp

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1:	jsr	start_kernel

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        bra 1b

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_exit:

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	jmp	_exit

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putc:

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	moveb	%d7,0xfffff907

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1:

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	movew	0xfffff906, %d7

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	andw	#0x2000, %d7

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	beq	1b

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	rts

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	.data

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env:

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	.long	0

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	.text

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