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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [lib/] [libcpu/] [powerpc/] [mpc6xx/] [mmu/] [bat.c] - Rev 507
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/* * bat.c * * This file contains the implementation of C function to * Instanciate 60x/7xx ppc Block Address Translation (BAT) registers. * More detailled information can be found on motorola * site and more precisely in the following book : * * MPC750 * Risc Microporcessor User's Manual * Mtorola REF : MPC750UM/AD 8/97 * * Copyright (C) 1999 Eric Valette (valette@crf.canon.fr) * Canon Centre Recherche France. * * The license and distribution terms for this file may be * found in found in the file LICENSE in this distribution or at * http://www.OARcorp.com/rtems/license.html. * * $Id: bat.c,v 1.2 2001-09-27 12:01:25 chris Exp $ */ #include <libcpu/bat.h> typedef union { /* BAT register values to be loaded */ BAT bat; unsigned int word[2]; }ubat; typedef struct batrange { /* stores address ranges mapped by BATs */ unsigned long start; unsigned long limit; unsigned long phys; }batrange; batrange bat_addrs[4]; void setdbat(int bat_index, unsigned long virt, unsigned long phys, unsigned int size, int flags) { unsigned int bl; int wimgxpp; ubat bat; bl = (size >> 17) - 1; /* 603, 604, etc. */ wimgxpp = flags & (_PAGE_WRITETHRU | _PAGE_NO_CACHE | _PAGE_COHERENT | _PAGE_GUARDED); wimgxpp |= (flags & _PAGE_RW)? BPP_RW: BPP_RX; bat.word[0] = virt | (bl << 2) | 2; /* Vs=1, Vp=0 */ bat.word[1] = phys | wimgxpp; if (flags & _PAGE_USER) bat.bat.batu.vp = 1; bat_addrs[bat_index].start = virt; bat_addrs[bat_index].limit = virt + ((bl + 1) << 17) - 1; bat_addrs[bat_index].phys = phys; switch (bat_index) { case 1 : asm_setdbat1(bat.word[0], bat.word[1]); break; case 2 : asm_setdbat2(bat.word[0], bat.word[1]); break; case 3 : asm_setdbat3(bat.word[0], bat.word[1]); break; default: printk("bat.c : invalid BAT bat_index\n"); } }
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