Home | History | Annotate | Line # | Download | only in wii
wii_mmuinit.S revision 1.1.2.3 
      1 /* $NetBSD: wii_mmuinit.S,v 1.1.2.3 2024/10/14 16:44:42 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 	/* Initialize HID0 and HID4 */
     71 	lis	%r11, 0x0011
     72 	ori	%r11, %r11, 0x0c64
     73 	mtspr	SPR_HID0, %r11
     74 	isync
     75 
     76 	lis	%r11, 0x8200
     77 	mtspr	1011, %r11	/* 1011 = SPR_HID4 */
     78 	isync
     79 
     80 	mfspr	%r11, 920
     81 	oris	%r11, %r11, 0xa000
     82 	mtspr	920, %r11
     83 
     84 	mfspr	%r11, SPR_HID0
     85 	ori	%r11, %r11, 0xc000
     86 	ori	%r11, %r11, 0x0800
     87 	ori	%r11, %r11, 0x0200
     88 	mtspr	SPR_HID0, %r11
     89 	isync
     90 
     91 	/* Reset standard BATs */
     92 	li	%r11, 0
     93 	mtibatu 0, %r11
     94 	mtibatl 0, %r11
     95 	mtdbatu 0, %r11
     96 	mtdbatl 0, %r11
     97 	mtibatu 1, %r11
     98 	mtibatl 1, %r11
     99 	mtdbatu 1, %r11
    100 	mtdbatl 1, %r11
    101 	mtibatu 2, %r11
    102 	mtibatl 2, %r11
    103 	mtdbatu 2, %r11
    104 	mtdbatl 2, %r11
    105 	mtibatu 3, %r11
    106 	mtibatl 3, %r11
    107 	mtdbatu 3, %r11
    108 	mtdbatl 3, %r11
    109 
    110 	/* Reset high BATs. IBAT[4-7][UL] + DBAT[4-7][UL] */
    111 	mtspr	560, %r11
    112 	mtspr	561, %r11
    113 	mtspr	562, %r11
    114 	mtspr	563, %r11
    115 	mtspr	564, %r11
    116 	mtspr	565, %r11
    117 	mtspr	566, %r11
    118 	mtspr	567, %r11
    119 	mtspr	568, %r11
    120 	mtspr	569, %r11
    121 	mtspr	570, %r11
    122 	mtspr	571, %r11
    123 	mtspr	572, %r11
    124 	mtspr	573, %r11
    125 	mtspr	574, %r11
    126 	mtspr	575, %r11
    127 
    128 	/*
    129 	 * We need to setup BAT0 as in mmu_oea.c.
    130 	 */
    131 	li	%r11, BATU(0x00000000, BAT_BL_256M, BAT_Vs)
    132 	li	%r12, BATL(0x00000000, BAT_M, BAT_PP_RW)
    133 	mtdbatu	0, %r11
    134 	mtdbatl	0, %r12
    135 	mtibatu	0, %r11
    136 	mtibatl	0, %r12
    137 	isync
    138 
    139 	/*
    140 	 * We use BAT1 to be able to write I/O memory, including the
    141 	 * framebuffer registers.
    142 	 */
    143 	/* BATU(0x0c000000, BAT_BL_32M, BAT_Vs) */
    144 	lis	%r11, 0x0c00
    145 	ori	%r11, %r11, BAT_BL_32M|BAT_Vs
    146 	/* BATL(0x0c000000, BAT_I|BAT_G, BAT_PP_RW) */
    147 	lis	%r12, 0x0c00
    148 	ori	%r12, %r12, BAT_I|BAT_G|BAT_PP_RW
    149 	mtdbatu	1, %r11
    150 	mtdbatl	1, %r12
    151 	isync
    152 
    153 	MMU_VIRTUALMODE()
    154