[linux-2.6-block.git] / arch / mips / dec / boot / decstation.c

/*
 * arch/mips/dec/boot/decstation.c
 */
#include <asm/sections.h>

#define RELOC
#define INITRD
#define DEBUG_BOOT

/*
 * Magic number indicating REX PROM available on DECSTATION.
 */
#define	REX_PROM_MAGIC		0x30464354

#define REX_PROM_CLEARCACHE	0x7c/4
#define REX_PROM_PRINTF		0x30/4

#define VEC_RESET		0xBFC00000		/* Prom base address */
#define	PMAX_PROM_ENTRY(x)	(VEC_RESET+((x)*8))	/* Prom jump table */
#define	PMAX_PROM_PRINTF	PMAX_PROM_ENTRY(17)

#define PARAM	(k_start + 0x2000)

#define LOADER_TYPE (*(unsigned char *) (PARAM+0x210))
#define INITRD_START (*(unsigned long *) (PARAM+0x218))
#define INITRD_SIZE (*(unsigned long *) (PARAM+0x21c))

extern int _ftext;			/* begin and end of kernel image */
extern void kernel_entry(int, char **, unsigned long, int *);

void * memcpy(void * dest, const void *src, unsigned int count)
{
	unsigned long *tmp = (unsigned long *) dest, *s = (unsigned long *) src;

	count >>= 2;
	while (count--)
		*tmp++ = *s++;

	return dest;
}

void dec_entry(int argc, char **argv,
	       unsigned long magic, int *prom_vec)
{
	void (*rex_clear_cache)(void);
	int (*prom_printf)(char *, ...);
	unsigned long k_start, len;

	/*
	 * The DS5100 leaves cpu with BEV enabled, clear it.
	 */
	asm(	"lui\t$8,0x3000\n\t"
		"mtc0\t$8,$12\n\t"
		".section\t.sdata\n\t"
		".section\t.sbss\n\t"
		".section\t.text"
		: : : "$8");

#ifdef DEBUG_BOOT
	if (magic == REX_PROM_MAGIC) {
	prom_printf = (int (*)(char *, ...)) *(prom_vec + REX_PROM_PRINTF);
	} else {
		prom_printf = (int (*)(char *, ...)) PMAX_PROM_PRINTF;
	}
	prom_printf("Launching kernel...\n");
#endif

	k_start = (unsigned long) (&kernel_entry) & 0xffff0000;

#ifdef RELOC
	/*
	 * Now copy kernel image to its destination.
	 */
	len = ((unsigned long) (&_end) - k_start);
	memcpy((void *)k_start, &_ftext, len);
#endif

	if (magic == REX_PROM_MAGIC) {
		rex_clear_cache = (void (*)(void)) * (prom_vec + REX_PROM_CLEARCACHE);
		rex_clear_cache();
	}

	kernel_entry(argc, argv, magic, prom_vec);
}
Commit	Line	Data
1da177e4	1	/*
f30c2269	2	* arch/mips/dec/boot/decstation.c
1da177e4	3	*/
9c1f1257	4	#include <asm/sections.h>
1da177e4 LT	5
	6	#define RELOC
	7	#define INITRD
	8	#define DEBUG_BOOT
	9
	10	/*
	11	* Magic number indicating REX PROM available on DECSTATION.
	12	*/
	13	#define REX_PROM_MAGIC 0x30464354
	14
	15	#define REX_PROM_CLEARCACHE 0x7c/4
	16	#define REX_PROM_PRINTF 0x30/4
	17
	18	#define VEC_RESET 0xBFC00000 /* Prom base address */
	19	#define PMAX_PROM_ENTRY(x) (VEC_RESET+((x)8)) / Prom jump table */
	20	#define PMAX_PROM_PRINTF PMAX_PROM_ENTRY(17)
	21
	22	#define PARAM (k_start + 0x2000)
	23
	24	#define LOADER_TYPE ((unsigned char ) (PARAM+0x210))
	25	#define INITRD_START ((unsigned long ) (PARAM+0x218))
	26	#define INITRD_SIZE ((unsigned long ) (PARAM+0x21c))
	27
9c1f1257	28	extern int _ftext; /* begin and end of kernel image */
1da177e4 LT	29	extern void kernel_entry(int, char *, unsigned long, int );
	30
	31	void * memcpy(void * dest, const void *src, unsigned int count)
	32	{
	33	unsigned long tmp = (unsigned long ) dest, s = (unsigned long ) src;
	34
	35	count >>= 2;
	36	while (count--)
	37	tmp++ = s++;
	38
	39	return dest;
	40	}
	41
	42	void dec_entry(int argc, char **argv,
	43	unsigned long magic, int *prom_vec)
	44	{
	45	void (*rex_clear_cache)(void);
	46	int (prom_printf)(char , ...);
	47	unsigned long k_start, len;
	48
	49	/*
	50	* The DS5100 leaves cpu with BEV enabled, clear it.
	51	*/
	52	asm( "lui\t$8,0x3000\n\t"
	53	"mtc0\t$8,$12\n\t"
	54	".section\t.sdata\n\t"
	55	".section\t.sbss\n\t"
	56	".section\t.text"
	57	: : : "$8");
	58
	59	#ifdef DEBUG_BOOT
	60	if (magic == REX_PROM_MAGIC) {
	61	prom_printf = (int ()(char , ...)) *(prom_vec + REX_PROM_PRINTF);
	62	} else {
	63	prom_printf = (int ()(char , ...)) PMAX_PROM_PRINTF;
	64	}
	65	prom_printf("Launching kernel...\n");
	66	#endif
	67
	68	k_start = (unsigned long) (&kernel_entry) & 0xffff0000;
	69
	70	#ifdef RELOC
	71	/*
	72	* Now copy kernel image to its destination.
	73	*/
	74	len = ((unsigned long) (&_end) - k_start);
	75	memcpy((void *)k_start, &_ftext, len);
	76	#endif
	77
	78	if (magic == REX_PROM_MAGIC) {
	79	rex_clear_cache = (void ()(void)) (prom_vec + REX_PROM_CLEARCACHE);
	80	rex_clear_cache();
	81	}
	82
	83	kernel_entry(argc, argv, magic, prom_vec);
	84	}