1 files changed, 131 insertions, 0 deletions
diff --git a/sys/powerpc/wii/locore.S b/sys/powerpc/wii/locore.S
new file mode 100644
index 0000000..7254bec
--- /dev/null
+++ b/sys/powerpc/wii/locore.S
@@ -0,0 +1,131 @@
+/*-
+ * 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 <machine/bat.h>
+/*
+ * 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 FreeBSD.
+ *
+ * N.B.: keep the BAT0 in sync with mmu_oea.c and never touch BAT1 later.
+ *
+ * This file is being included from aim/locore32.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()
+
+	/* 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()