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

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	.global __rom_start

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        .global _rambase

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        .global _ramstart

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	.global splash_bits

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	.global _start

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	.global _stext

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	.global _edata

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#define DEBUG

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#define ROM_OFFSET 0x10C00000

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#define STACK_GAURD 0x10

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	.text

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_start:

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_stext:

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	movew	#0x2700, %sr            /* Exceptions off! */

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#if 0

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	/* Init chip registers.  uCsimm specific */

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	moveb	#0x00,   0xfffffb0b	/* Watchdog off */

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	moveb	#0x10,   0xfffff000	/* SCR */

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	movew   #0x2400, 0xfffff200	/* PLLCR */

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	movew   #0x0123, 0xfffff202	/* PLLFSR */

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	moveb	#0x00,   0xfffff40b	/* enable chip select */

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	moveb	#0x00,   0xfffff423	/* enable /DWE */

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	moveb	#0x08,   0xfffffd0d	/* disable hardmap */

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	moveb	#0x07,   0xfffffd0e	/* level 7 interrupt clear */

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	movew	#0x8600, 0xfffff100	/* FLASH at 0x10c00000 */

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	movew	#0x018b, 0xfffff110	/* 2Meg, enable, 0ws */

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	movew	#0x8f00, 0xfffffc00	/* DRAM configuration */

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	movew	#0x9667, 0xfffffc02	/* DRAM control */

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	movew	#0x0000, 0xfffff106	/* DRAM at 0x00000000 */

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	movew	#0x068f, 0xfffff116	/* 8Meg, enable, 0ws */

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	moveb	#0x40,   0xfffff300	/* IVR */

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	movel	#0x007FFFFF, %d0	/* IMR */

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	movel	%d0,     0xfffff304

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	moveb	0xfffff42b, %d0

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	andb	#0xe0,	 %d0

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	moveb	%d0,	 0xfffff42b

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	moveb	#0x08,   0xfffff907	/* Ignore CTS */

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	movew	#0x010b, 0xfffff902	/* BAUD to 9600 */

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	movew	#0xe100, 0xfffff900	/* enable */

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#endif

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	movew	#16384, %d0  /* PLL settle wait loop */

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L0:

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	subw	#1, %d0

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	bne	L0

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#ifdef DEBUG

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	moveq	#70, %d7		/* 'F' */

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	moveb	%d7,0xfffff907          /* No absolute addresses */

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pclp1:

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	movew	0xfffff906, %d7

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	andw	#0x2000, %d7

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	beq	pclp1

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#endif /* DEBUG */

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#ifdef DEBUG

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	moveq	#82, %d7		/* 'R' */

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	moveb	%d7,0xfffff907          /* No absolute addresses */

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pclp3:

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	movew	0xfffff906, %d7

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	andw	#0x2000, %d7

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	beq	pclp3

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#endif /* DEBUG */

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	moveal	#0x007ffff0, %ssp

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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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L1:

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	movel	#0, %a0@+

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	cmpal	%a0, %a1

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	bhi	L1

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#ifdef DEBUG

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	moveq	#67, %d7                /* 'C' */

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	jsr	putc

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#endif /* DEBUG */

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	pea	0

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	pea	env

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	pea	%sp@(4)

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	pea	0

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#ifdef DEBUG

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	moveq	#70, %d7		/* 'F' */

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	jsr	putc

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#endif /* DEBUG */

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lp:

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	jsr	start_kernel

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        jmp lp

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_exit:

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	jmp	_exit

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__main:

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	/* nothing */

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	rts

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#ifdef DEBUG

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putc:

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	moveb	%d7,0xfffff907

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pclp:

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	movew	0xfffff906, %d7

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	andw	#0x2000, %d7

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	beq	pclp

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	rts

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#endif /* DEBUG */

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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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env:

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	.long	0

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