board/sandburst/metrobox/init.S

   1 /*
   2 *  Copyright (C) 2005
   3 *  Travis B. Sawyer, Sandburst Corporation, tsawyer@sandburst.com
   4 *
   5 * See file CREDITS for list of people who contributed to this
   6 * project.
   7 *
   8 * This program is free software; you can redistribute it and/or
   9 * modify it under the terms of the GNU General Public License as
  10 * published by the Free Software Foundation; either version 2 of
  11 * the License, or (at your option) any later version.
  12 *
  13 * This program is distributed in the hope that it will be useful,
  14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.   See the
  16 * GNU General Public License for more details.
  17 *
  18 * You should have received a copy of the GNU General Public License
  19 * along with this program; if not, write to the Free Software
  20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21 * MA 02111-1307 USA
  22 */
  23
  24 #include <ppc_asm.tmpl>
  25 #include <config.h>
  26
  27 /* General */
  28 #define TLB_VALID   0x00000200
  29
  30 /* Supported page sizes */
  31
  32 #define SZ_1K       0x00000000
  33 #define SZ_4K       0x00000010
  34 #define SZ_16K      0x00000020
  35 #define SZ_64K      0x00000030
  36 #define SZ_256K     0x00000040
  37 #define SZ_1M       0x00000050
  38 #define SZ_16M      0x00000070
  39 #define SZ_256M     0x00000090
  40
  41 /* Storage attributes */
  42 #define SA_W        0x00000800      /* Write-through */
  43 #define SA_I        0x00000400      /* Caching inhibited */
  44 #define SA_M        0x00000200      /* Memory coherence */
  45 #define SA_G        0x00000100      /* Guarded */
  46 #define SA_E        0x00000080      /* Endian */
  47
  48 /* Access control */
  49 #define AC_X        0x00000024      /* Execute */
  50 #define AC_W        0x00000012      /* Write */
  51 #define AC_R        0x00000009      /* Read */
  52
  53 /* Some handy macros */
  54
  55 #define EPN(e)          ((e) & 0xfffffc00)
  56 #define TLB0(epn,sz)    ( (EPN((epn)) | (sz) | TLB_VALID ) )
  57 #define TLB1(rpn,erpn)  ( ((rpn)&0xfffffc00) | (erpn) )
  58 #define TLB2(a)         ( (a)&0x00000fbf )
  59
  60 #define tlbtab_start\
  61         mflr    r1  ;\
  62         bl 0f       ;
  63
  64 #define tlbtab_end\
  65         .long 0, 0, 0   ;   \
  66 0:      mflr    r0      ;   \
  67         mtlr    r1      ;   \
  68         blr             ;
  69
  70 #define tlbentry(epn,sz,rpn,erpn,attr)\
  71         .long TLB0(epn,sz),TLB1(rpn,erpn),TLB2(attr)
  72
  73
  74 /**************************************************************************
  75  * TLB TABLE
  76  *
  77  * This table is used by the cpu boot code to setup the initial tlb
  78  * entries. Rather than make broad assumptions in the cpu source tree,
  79  * this table lets each board set things up however they like.
  80  *
  81  *  Pointer to the table is returned in r1
  82  *
  83  *************************************************************************/
  84
  85         .section .bootpg,"ax"
  86         .globl tlbtab
  87
  88 tlbtab:
  89         tlbtab_start
  90         tlbentry( 0xf0000000, SZ_256M, 0xf0000000, 1, AC_R|AC_W|AC_X|SA_G|SA_I)
  91         tlbentry( CONFIG_SYS_PERIPHERAL_BASE, SZ_256M, 0x40000000, 1, AC_R|AC_W|SA_G|SA_I)
  92         tlbentry( CONFIG_SYS_ISRAM_BASE, SZ_256K, 0x80000000, 0, AC_R|AC_W|AC_X|SA_G|SA_I)
  93         tlbentry( CONFIG_SYS_SDRAM_BASE, SZ_256M, 0x00000000, 0, AC_R|AC_W|AC_X|SA_G|SA_I )
  94         tlbentry( CONFIG_SYS_SDRAM_BASE+0x10000000, SZ_256M, 0x10000000, 0, AC_R|AC_W|AC_X|SA_G|SA_I )
  95         tlbentry( CONFIG_SYS_SDRAM_BASE+0x20000000, SZ_256M, 0x20000000, 0, AC_R|AC_W|AC_X|SA_G|SA_I )
  96         tlbentry( CONFIG_SYS_SDRAM_BASE+0x30000000, SZ_256M, 0x30000000, 0, AC_R|AC_W|AC_X|SA_G|SA_I )
  97         tlbentry( CONFIG_SYS_PCI_BASE, SZ_256M, 0x00000000, 2, AC_R|AC_W|SA_G|SA_I )
  98         tlbentry( CONFIG_SYS_PCI_MEMBASE, SZ_256M, 0x00000000, 3, AC_R|AC_W|SA_G|SA_I )
  99         tlbtab_end