84 lines
1.9 KiB
C
84 lines
1.9 KiB
C
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/*
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* arch/mips/dec/decstation.c
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*/
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#define RELOC
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#define INITRD
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#define DEBUG_BOOT
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/*
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* Magic number indicating REX PROM available on DECSTATION.
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*/
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#define REX_PROM_MAGIC 0x30464354
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#define REX_PROM_CLEARCACHE 0x7c/4
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#define REX_PROM_PRINTF 0x30/4
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#define VEC_RESET 0xBFC00000 /* Prom base address */
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#define PMAX_PROM_ENTRY(x) (VEC_RESET+((x)*8)) /* Prom jump table */
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#define PMAX_PROM_PRINTF PMAX_PROM_ENTRY(17)
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#define PARAM (k_start + 0x2000)
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#define LOADER_TYPE (*(unsigned char *) (PARAM+0x210))
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#define INITRD_START (*(unsigned long *) (PARAM+0x218))
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#define INITRD_SIZE (*(unsigned long *) (PARAM+0x21c))
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extern int _ftext, _end; /* begin and end of kernel image */
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extern void kernel_entry(int, char **, unsigned long, int *);
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void * memcpy(void * dest, const void *src, unsigned int count)
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{
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unsigned long *tmp = (unsigned long *) dest, *s = (unsigned long *) src;
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count >>= 2;
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while (count--)
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*tmp++ = *s++;
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return dest;
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}
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void dec_entry(int argc, char **argv,
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unsigned long magic, int *prom_vec)
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{
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void (*rex_clear_cache)(void);
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int (*prom_printf)(char *, ...);
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unsigned long k_start, len;
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/*
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* The DS5100 leaves cpu with BEV enabled, clear it.
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*/
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asm( "lui\t$8,0x3000\n\t"
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"mtc0\t$8,$12\n\t"
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".section\t.sdata\n\t"
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".section\t.sbss\n\t"
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".section\t.text"
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: : : "$8");
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#ifdef DEBUG_BOOT
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if (magic == REX_PROM_MAGIC) {
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prom_printf = (int (*)(char *, ...)) *(prom_vec + REX_PROM_PRINTF);
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} else {
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prom_printf = (int (*)(char *, ...)) PMAX_PROM_PRINTF;
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}
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prom_printf("Launching kernel...\n");
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#endif
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k_start = (unsigned long) (&kernel_entry) & 0xffff0000;
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#ifdef RELOC
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/*
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* Now copy kernel image to its destination.
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*/
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len = ((unsigned long) (&_end) - k_start);
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memcpy((void *)k_start, &_ftext, len);
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#endif
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if (magic == REX_PROM_MAGIC) {
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rex_clear_cache = (void (*)(void)) * (prom_vec + REX_PROM_CLEARCACHE);
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rex_clear_cache();
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}
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kernel_entry(argc, argv, magic, prom_vec);
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}
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