wii_mmuinit.S revision 1.1.2.2
1 /* $NetBSD: wii_mmuinit.S,v 1.1.2.2 2024/02/03 11:47:07 martin Exp $ */ 2 3 /*- 4 * Copyright (C) 2012 Margarida Gouveia 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 20 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 22 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 23 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 24 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 25 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 * 27 * $FreeBSD$ 28 */ 29 30 #include <powerpc/oea/bat.h> 31 32 /* 33 * When we are invoked from Wii loaders, the state of the MMU and the BAT 34 * mappings can vary. In this file we try to reset the MMU to a state 35 * that lets us boot NetBSD. 36 * 37 * This file is being included from wii_locore.S. 38 */ 39 40 #define MMU_REALMODE() \ 41 mfmsr %r12; \ 42 rlwinm %r12, %r12, 0, ~(PSL_DR|PSL_IR);\ 43 sync; \ 44 bl 1f; \ 45 1: \ 46 mflr %r11; \ 47 clrlwi %r11, %r11, 3; /* XXX why? */ \ 48 addi %r11, %r11, 2f - 1b; \ 49 mtsrr0 %r11; \ 50 mtsrr1 %r12; /* Disables the MMU */ \ 51 isync; \ 52 rfi; \ 53 2: 54 55 #define MMU_VIRTUALMODE() \ 56 bl 3f; \ 57 3: \ 58 mflr %r11; \ 59 addi %r11, %r11, 4f - 3b; \ 60 mfmsr %r12; \ 61 ori %r12, %r12, PSL_DR|PSL_IR; \ 62 mtsrr0 %r11; \ 63 mtsrr1 %r12; /* Enables the MMU */ \ 64 isync; \ 65 rfi; \ 66 4: 67 68 MMU_REALMODE() 69 70 /* Reset standard BATs */ 71 li %r11, 0 72 mtibatu 0, %r11 73 mtibatl 0, %r11 74 mtdbatu 0, %r11 75 mtdbatl 0, %r11 76 mtibatu 1, %r11 77 mtibatl 1, %r11 78 mtdbatu 1, %r11 79 mtdbatl 1, %r11 80 mtibatu 2, %r11 81 mtibatl 2, %r11 82 mtdbatu 2, %r11 83 mtdbatl 2, %r11 84 mtibatu 3, %r11 85 mtibatl 3, %r11 86 mtdbatu 3, %r11 87 mtdbatl 3, %r11 88 89 /* Reset high BATs. IBAT[4-7][UL] + DBAT[4-7][UL] */ 90 mtspr 560, %r11 91 mtspr 561, %r11 92 mtspr 562, %r11 93 mtspr 563, %r11 94 mtspr 564, %r11 95 mtspr 565, %r11 96 mtspr 566, %r11 97 mtspr 567, %r11 98 mtspr 568, %r11 99 mtspr 569, %r11 100 mtspr 570, %r11 101 mtspr 571, %r11 102 mtspr 572, %r11 103 mtspr 573, %r11 104 mtspr 574, %r11 105 mtspr 575, %r11 106 107 /* 108 * We need to setup BAT0 as in mmu_oea.c. 109 */ 110 li %r11, BATU(0x00000000, BAT_BL_256M, BAT_Vs) 111 li %r12, BATL(0x00000000, BAT_M, BAT_PP_RW) 112 mtdbatu 0, %r11 113 mtdbatl 0, %r12 114 mtibatu 0, %r11 115 mtibatl 0, %r12 116 isync 117 118 /* 119 * We use BAT1 to be able to write I/O memory, including the 120 * framebuffer registers. 121 */ 122 /* BATU(0x0c000000, BAT_BL_32M, BAT_Vs) */ 123 lis %r11, 0x0c00 124 ori %r11, %r11, BAT_BL_32M|BAT_Vs 125 /* BATL(0x0c000000, BAT_I|BAT_G, BAT_PP_RW) */ 126 lis %r12, 0x0c00 127 ori %r12, %r12, BAT_I|BAT_G|BAT_PP_RW 128 mtdbatu 1, %r11 129 mtdbatl 1, %r12 130 isync 131 132 MMU_VIRTUALMODE() 133
Indexes created Sat Oct 25 16:10:12 GMT 2025