Viewing file:  init.c (3.41 KB) -rw-r--r--
Select action/file-type:
 (+) |  (+) |  (+) | Code (+) | Session (+) |  (+) | SDB (+) |  (+) |  (+) |  (+) |  (+) |  (+) |
/*
* init.c: PROM library initialisation code.
*
* Copyright (C) 1998 Harald Koerfgen
*/
#include <linux/init.h>
#include <linux/config.h>
#include <asm/bootinfo.h>
#include <asm/cpu.h>
#include "prom.h"
/*
* PROM Interface (whichprom.c)
*/
typedef struct {
int pagesize;
unsigned char bitmap[0];
} memmap;
int (*rex_bootinit)(void);
int (*rex_bootread)(void);
int (*rex_getbitmap)(memmap *);
unsigned long *(*rex_slot_address)(int);
void *(*rex_gettcinfo)(void);
int (*rex_getsysid)(void);
void (*rex_clear_cache)(void);
int (*prom_getchar)(void);
char *(*prom_getenv)(char *);
int (*prom_printf)(char *, ...);
int (*pmax_open)(char*, int);
int (*pmax_lseek)(int, long, int);
int (*pmax_read)(int, void *, int);
int (*pmax_close)(int);
extern void prom_meminit(unsigned int);
extern void prom_identify_arch(unsigned int);
extern void prom_init_cmdline(int, char **, unsigned long);
/*
* Detect which PROM's the DECSTATION has, and set the callback vectors
* appropriately.
*/
void __init which_prom(unsigned long magic, int *prom_vec)
{
/*
* No sign of the REX PROM's magic number means we assume a non-REX
* machine (i.e. we're on a DS2100/3100, DS5100 or DS5000/2xx)
*/
if (magic == REX_PROM_MAGIC)
{
/*
* Set up prom abstraction structure with REX entry points.
*/
rex_bootinit = (int (*)(void)) *(prom_vec + REX_PROM_BOOTINIT);
rex_bootread = (int (*)(void)) *(prom_vec + REX_PROM_BOOTREAD);
rex_getbitmap = (int (*)(memmap *)) *(prom_vec + REX_PROM_GETBITMAP);
prom_getchar = (int (*)(void)) *(prom_vec + REX_PROM_GETCHAR);
prom_getenv = (char *(*)(char *)) *(prom_vec + REX_PROM_GETENV);
rex_getsysid = (int (*)(void)) *(prom_vec + REX_PROM_GETSYSID);
rex_gettcinfo = (void *(*)(void)) *(prom_vec + REX_PROM_GETTCINFO);
prom_printf = (int (*)(char *, ...)) *(prom_vec + REX_PROM_PRINTF);
rex_slot_address = (unsigned long *(*)(int)) *(prom_vec + REX_PROM_SLOTADDR);
rex_clear_cache = (void (*)(void)) * (prom_vec + REX_PROM_CLEARCACHE);
}
else
{
/*
* Set up prom abstraction structure with non-REX entry points.
*/
prom_getchar = (int (*)(void)) PMAX_PROM_GETCHAR;
prom_getenv = (char *(*)(char *)) PMAX_PROM_GETENV;
prom_printf = (int (*)(char *, ...)) PMAX_PROM_PRINTF;
pmax_open = (int (*)(char *, int)) PMAX_PROM_OPEN;
pmax_lseek = (int (*)(int, long, int)) PMAX_PROM_LSEEK;
pmax_read = (int (*)(int, void *, int)) PMAX_PROM_READ;
pmax_close = (int (*)(int)) PMAX_PROM_CLOSE;
}
}
int __init prom_init(int argc, char **argv,
unsigned long magic, int *prom_vec)
{
extern void dec_machine_halt(void);
/* Determine which PROM's we have (and therefore which machine we're on!) */
which_prom(magic, prom_vec);
if (magic == REX_PROM_MAGIC)
rex_clear_cache();
/* Were we compiled with the right CPU option? */
#if defined(CONFIG_CPU_R3000)
if ((mips_cpu.cputype == CPU_R4000SC) ||
(mips_cpu.cputype == CPU_R4400SC)) {
prom_printf("Sorry, this kernel is compiled for the wrong CPU type!\n");
prom_printf("Please recompile with \"CONFIG_CPU_R4x00 = y\"\n");
dec_machine_halt();
}
#endif
#if defined(CONFIG_CPU_R4X00)
if ((mips_cpu.cputype == CPU_R3000) ||
(mips_cpu.cputype == CPU_R3000A)) {
prom_printf("Sorry, this kernel is compiled for the wrong CPU type!\n");
prom_printf("Please recompile with \"CONFIG_CPU_R3000 = y\"\n");
dec_machine_halt();
}
#endif
prom_meminit(magic);
prom_identify_arch(magic);
prom_init_cmdline(argc, argv, magic);
return 0;
}
|