/* $NetBSD: wii_mmuinit.S,v 1.1.2.3 2024/10/14 16:44:42 martin Exp $ */ /*- * Copyright (C) 2012 Margarida Gouveia * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * * $FreeBSD$ */ #include /* * When we are invoked from Wii loaders, the state of the MMU and the BAT * mappings can vary. In this file we try to reset the MMU to a state * that lets us boot NetBSD. * * This file is being included from wii_locore.S. */ #define MMU_REALMODE() \ mfmsr %r12; \ rlwinm %r12, %r12, 0, ~(PSL_DR|PSL_IR);\ sync; \ bl 1f; \ 1: \ mflr %r11; \ clrlwi %r11, %r11, 3; /* XXX why? */ \ addi %r11, %r11, 2f - 1b; \ mtsrr0 %r11; \ mtsrr1 %r12; /* Disables the MMU */ \ isync; \ rfi; \ 2: #define MMU_VIRTUALMODE() \ bl 3f; \ 3: \ mflr %r11; \ addi %r11, %r11, 4f - 3b; \ mfmsr %r12; \ ori %r12, %r12, PSL_DR|PSL_IR; \ mtsrr0 %r11; \ mtsrr1 %r12; /* Enables the MMU */ \ isync; \ rfi; \ 4: MMU_REALMODE() /* Initialize HID0 and HID4 */ lis %r11, 0x0011 ori %r11, %r11, 0x0c64 mtspr SPR_HID0, %r11 isync lis %r11, 0x8200 mtspr 1011, %r11 /* 1011 = SPR_HID4 */ isync mfspr %r11, 920 oris %r11, %r11, 0xa000 mtspr 920, %r11 mfspr %r11, SPR_HID0 ori %r11, %r11, 0xc000 ori %r11, %r11, 0x0800 ori %r11, %r11, 0x0200 mtspr SPR_HID0, %r11 isync /* Reset standard BATs */ li %r11, 0 mtibatu 0, %r11 mtibatl 0, %r11 mtdbatu 0, %r11 mtdbatl 0, %r11 mtibatu 1, %r11 mtibatl 1, %r11 mtdbatu 1, %r11 mtdbatl 1, %r11 mtibatu 2, %r11 mtibatl 2, %r11 mtdbatu 2, %r11 mtdbatl 2, %r11 mtibatu 3, %r11 mtibatl 3, %r11 mtdbatu 3, %r11 mtdbatl 3, %r11 /* Reset high BATs. IBAT[4-7][UL] + DBAT[4-7][UL] */ mtspr 560, %r11 mtspr 561, %r11 mtspr 562, %r11 mtspr 563, %r11 mtspr 564, %r11 mtspr 565, %r11 mtspr 566, %r11 mtspr 567, %r11 mtspr 568, %r11 mtspr 569, %r11 mtspr 570, %r11 mtspr 571, %r11 mtspr 572, %r11 mtspr 573, %r11 mtspr 574, %r11 mtspr 575, %r11 /* * We need to setup BAT0 as in mmu_oea.c. */ li %r11, BATU(0x00000000, BAT_BL_256M, BAT_Vs) li %r12, BATL(0x00000000, BAT_M, BAT_PP_RW) mtdbatu 0, %r11 mtdbatl 0, %r12 mtibatu 0, %r11 mtibatl 0, %r12 isync /* * We use BAT1 to be able to write I/O memory, including the * framebuffer registers. */ /* BATU(0x0c000000, BAT_BL_32M, BAT_Vs) */ lis %r11, 0x0c00 ori %r11, %r11, BAT_BL_32M|BAT_Vs /* BATL(0x0c000000, BAT_I|BAT_G, BAT_PP_RW) */ lis %r12, 0x0c00 ori %r12, %r12, BAT_I|BAT_G|BAT_PP_RW mtdbatu 1, %r11 mtdbatl 1, %r12 isync MMU_VIRTUALMODE()