text: /*
   * init.c: PROM library initialisation code.
   *
   * Copyright (C) 1998 Harald Koerfgen
   * Copyright (C) 2002  Maciej W. Rozycki
   */
  #include <linux/config.h>
  #include <linux/init.h>
  #include <linux/types.h>
  
  #include <asm/bootinfo.h>
  #include <asm/cpu.h>
  #include <asm/dec/prom.h>
  
  
  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);
  
  
  /*
   * Detect which PROM's the DECSTATION has, and set the callback vectors
   * appropriately.
   */
  void __init which_prom(s32 magic, s32 *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 (prom_is_rex(magic)) {
  		/*
  		 * Set up prom abstraction structure with REX entry points.
  		 */
  		__rex_bootinit =
  			(void *)(long)*(prom_vec + REX_PROM_BOOTINIT);
  		__rex_bootread =
  			(void *)(long)*(prom_vec + REX_PROM_BOOTREAD);
  		__rex_getbitmap =
  			(void *)(long)*(prom_vec + REX_PROM_GETBITMAP);
  		__prom_getchar =
  			(void *)(long)*(prom_vec + REX_PROM_GETCHAR);
  		__prom_getenv =
  			(void *)(long)*(prom_vec + REX_PROM_GETENV);
  		__rex_getsysid =
  			(void *)(long)*(prom_vec + REX_PROM_GETSYSID);
  		__rex_gettcinfo =
  			(void *)(long)*(prom_vec + REX_PROM_GETTCINFO);
  		__prom_printf =
  			(void *)(long)*(prom_vec + REX_PROM_PRINTF);
  		__rex_slot_address =
  			(void *)(long)*(prom_vec + REX_PROM_SLOTADDR);
  		__rex_clear_cache =
  			(void *)(long)*(prom_vec + REX_PROM_CLEARCACHE);
  	} else {
  		/*
  		 * Set up prom abstraction structure with non-REX entry points.
  		 */
  		__prom_getchar = (void *)PMAX_PROM_GETCHAR;
  		__prom_getenv = (void *)PMAX_PROM_GETENV;
  		__prom_printf = (void *)PMAX_PROM_PRINTF;
  		__pmax_open = (void *)PMAX_PROM_OPEN;
  		__pmax_lseek = (void *)PMAX_PROM_LSEEK;
  		__pmax_read = (void *)PMAX_PROM_READ;
  		__pmax_close = (void *)PMAX_PROM_CLOSE;
  	}
  }
  
  int __init prom_init(s32 argc, s32 *argv, u32 magic, s32 *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 (prom_is_rex(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;
  }
  