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/*
* arch/mips/dec/decstation.c
*/
#include <linux/config.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, _end; /* begin and end of kernel image */
extern void *__rd_start, *__rd_end; /* begin and end of ramdisk 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 it's 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();
}
#ifdef CONFIG_BLK_DEV_INITRD
LOADER_TYPE = 1;
INITRD_START = (long)&__rd_start;
INITRD_SIZE = (long)&__rd_end - (long)&__rd_start;
#endif
kernel_entry(argc, argv, magic, prom_vec);
}
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