You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
84 lines
1.9 KiB
84 lines
1.9 KiB
/*
|
|
* arch/mips/dec/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);
|
|
}
|
|
|