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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [lib/] [libcpu/] [powerpc/] [mpc6xx/] [mmu/] [bat.c] - Blame information for rev 173

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1 30 unneback
/*
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 * bat.c
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 *
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 *          This file contains the implementation of C function to
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 *          Instanciate 60x/7xx ppc Block Address Translation (BAT) registers.
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 *          More detailled information can be found on motorola
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 *          site and more precisely in the following book :
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 *
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 *              MPC750
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 *              Risc Microporcessor User's Manual
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 *              Mtorola REF : MPC750UM/AD 8/97
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 *
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 * Copyright (C) 1999  Eric Valette (valette@crf.canon.fr)
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 *                     Canon Centre Recherche France.
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 *
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 *  The license and distribution terms for this file may be
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 *  found in found in the file LICENSE in this distribution or at
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 *  http://www.OARcorp.com/rtems/license.html.
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 *
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 * $Id: bat.c,v 1.2 2001-09-27 12:01:25 chris Exp $
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 */
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#include <libcpu/bat.h>
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typedef union {                 /* BAT register values to be loaded */
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        BAT             bat;
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        unsigned int    word[2];
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}ubat;
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typedef struct batrange {               /* stores address ranges mapped by BATs */
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        unsigned long start;
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        unsigned long limit;
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        unsigned long phys;
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}batrange;
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batrange bat_addrs[4];
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void setdbat(int bat_index, unsigned long virt, unsigned long phys,
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       unsigned int size, int flags)
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{
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  unsigned int bl;
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  int wimgxpp;
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  ubat bat;
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  bl = (size >> 17) - 1;
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  /* 603, 604, etc. */
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  wimgxpp = flags & (_PAGE_WRITETHRU | _PAGE_NO_CACHE
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                     | _PAGE_COHERENT | _PAGE_GUARDED);
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  wimgxpp |= (flags & _PAGE_RW)? BPP_RW: BPP_RX;
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  bat.word[0] = virt | (bl << 2) | 2; /* Vs=1, Vp=0 */
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  bat.word[1] = phys | wimgxpp;
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  if (flags & _PAGE_USER)
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    bat.bat.batu.vp = 1;
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  bat_addrs[bat_index].start = virt;
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  bat_addrs[bat_index].limit = virt + ((bl + 1) << 17) - 1;
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  bat_addrs[bat_index].phys = phys;
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  switch (bat_index) {
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  case 1 : asm_setdbat1(bat.word[0], bat.word[1]); break;
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  case 2 : asm_setdbat2(bat.word[0], bat.word[1]); break;
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  case 3 : asm_setdbat3(bat.word[0], bat.word[1]); break;
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  default: printk("bat.c : invalid BAT bat_index\n");
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  }
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}
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