| Stefan Roese | b79316f | 2005-08-15 12:31:23 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2005 Sandburst Corporation |
| 3 | * |
| 4 | * See file CREDITS for list of people who contributed to this |
| 5 | * project. |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU General Public License as |
| 9 | * published by the Free Software Foundation; either version 2 of |
| 10 | * the License, or (at your option) any later version. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | * GNU General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License |
| 18 | * along with this program; if not, write to the Free Software |
| 19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, |
| 20 | * MA 02111-1307 USA |
| 21 | */ |
| 22 | /* |
| 23 | * Ported from Ebony init.S by Travis B. Sawyer |
| 24 | */ |
| 25 | |
| 26 | #include <ppc_asm.tmpl> |
| 27 | #include <config.h> |
| 28 | |
| 29 | /* General */ |
| 30 | #define TLB_VALID 0x00000200 |
| 31 | |
| 32 | /* Supported page sizes */ |
| 33 | |
| 34 | #define SZ_1K 0x00000000 |
| 35 | #define SZ_4K 0x00000010 |
| 36 | #define SZ_16K 0x00000020 |
| 37 | #define SZ_64K 0x00000030 |
| 38 | #define SZ_256K 0x00000040 |
| 39 | #define SZ_1M 0x00000050 |
| 40 | #define SZ_16M 0x00000070 |
| 41 | #define SZ_256M 0x00000090 |
| 42 | |
| 43 | /* Storage attributes */ |
| 44 | #define SA_W 0x00000800 /* Write-through */ |
| 45 | #define SA_I 0x00000400 /* Caching inhibited */ |
| 46 | #define SA_M 0x00000200 /* Memory coherence */ |
| 47 | #define SA_G 0x00000100 /* Guarded */ |
| 48 | #define SA_E 0x00000080 /* Endian */ |
| 49 | |
| 50 | /* Access control */ |
| 51 | #define AC_X 0x00000024 /* Execute */ |
| 52 | #define AC_W 0x00000012 /* Write */ |
| 53 | #define AC_R 0x00000009 /* Read */ |
| 54 | |
| 55 | /* Some handy macros */ |
| 56 | |
| 57 | #define EPN(e) ((e) & 0xfffffc00) |
| 58 | #define TLB0(epn,sz) ( (EPN((epn)) | (sz) | TLB_VALID ) ) |
| 59 | #define TLB1(rpn,erpn) ( ((rpn)&0xfffffc00) | (erpn) ) |
| 60 | #define TLB2(a) ( (a)&0x00000fbf ) |
| 61 | |
| 62 | #define tlbtab_start\ |
| 63 | mflr r1 ;\ |
| 64 | bl 0f ; |
| 65 | |
| 66 | #define tlbtab_end\ |
| 67 | .long 0, 0, 0 ; \ |
| 68 | 0: mflr r0 ; \ |
| 69 | mtlr r1 ; \ |
| 70 | blr ; |
| 71 | |
| 72 | #define tlbentry(epn,sz,rpn,erpn,attr)\ |
| 73 | .long TLB0(epn,sz),TLB1(rpn,erpn),TLB2(attr) |
| 74 | |
| 75 | |
| 76 | /************************************************************************** |
| 77 | * TLB TABLE |
| 78 | * |
| 79 | * This table is used by the cpu boot code to setup the initial tlb |
| 80 | * entries. Rather than make broad assumptions in the cpu source tree, |
| 81 | * this table lets each board set things up however they like. |
| 82 | * |
| 83 | * Pointer to the table is returned in r1 |
| 84 | * |
| 85 | *************************************************************************/ |
| 86 | |
| 87 | .section .bootpg,"ax" |
| 88 | .globl tlbtab |
| 89 | |
| 90 | tlbtab: |
| 91 | tlbtab_start |
| 92 | tlbentry( 0xf0000000, SZ_256M, 0xf0000000, 1, AC_R|AC_W|AC_X|SA_G|SA_I) |
| 93 | tlbentry( CFG_PERIPHERAL_BASE, SZ_256M, 0x40000000, 1, AC_R|AC_W|SA_G|SA_I) |
| 94 | tlbentry( CFG_ISRAM_BASE, SZ_256K, 0x80000000, 0, AC_R|AC_W|AC_X|SA_G|SA_I) |
| 95 | tlbentry( CFG_SDRAM_BASE, SZ_256M, 0x00000000, 0, AC_R|AC_W|AC_X|SA_G|SA_I ) |
| 96 | tlbentry( CFG_SDRAM_BASE+0x10000000, SZ_256M, 0x10000000, 0, AC_R|AC_W|AC_X|SA_G|SA_I ) |
| 97 | tlbentry( CFG_SDRAM_BASE+0x20000000, SZ_256M, 0x20000000, 0, AC_R|AC_W|AC_X|SA_G|SA_I ) |
| 98 | tlbentry( CFG_SDRAM_BASE+0x30000000, SZ_256M, 0x30000000, 0, AC_R|AC_W|AC_X|SA_G|SA_I ) |
| 99 | tlbentry( CFG_PCI_BASE, SZ_256M, 0x00000000, 2, AC_R|AC_W|SA_G|SA_I ) |
| 100 | tlbentry( CFG_PCI_MEMBASE, SZ_256M, 0x00000000, 3, AC_R|AC_W|SA_G|SA_I ) |
| 101 | tlbtab_end |