From 313c480904c0c2442c6c71fc8df4d825d0834b72 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Markus=20Fr=C3=B6schle?= <mfro@mubf.de>
Date: Thu, 1 Aug 2013 16:01:35 +0000
Subject: [PATCH] started MMU implementation in C

---
 BaS_gcc/Makefile      |  2 +-
 BaS_gcc/include/mmu.h | 22 ++++++++++++++++++++++
 BaS_gcc/sources/mmu.S |  3 +--
 BaS_gcc/sources/mmu.c | 26 ++++++++++++++++++++++++++
 4 files changed, 50 insertions(+), 3 deletions(-)
 create mode 100644 BaS_gcc/include/mmu.h
 create mode 100644 BaS_gcc/sources/mmu.c

diff --git a/BaS_gcc/Makefile b/BaS_gcc/Makefile
index 5317878..f631135 100644
--- a/BaS_gcc/Makefile
+++ b/BaS_gcc/Makefile
@@ -66,6 +66,7 @@ CSRCS= \
 	$(SRCDIR)/BaS.c \
 	$(SRCDIR)/cache.c \
 	$(SRCDIR)/mmc.c \
+	$(SRCDIR)/mmu.c \
 	$(SRCDIR)/unicode.c \
 	$(SRCDIR)/ff.c \
 	$(SRCDIR)/sd_card.c \
@@ -79,7 +80,6 @@ CSRCS= \
 ASRCS= \
 	$(SRCDIR)/startcf.S \
 	$(SRCDIR)/printf_helper.S \
-	$(SRCDIR)/mmu.S \
 	$(SRCDIR)/exceptions.S \
 	$(SRCDIR)/supervisor.S \
 	$(SRCDIR)/illegal_instruction.S \
diff --git a/BaS_gcc/include/mmu.h b/BaS_gcc/include/mmu.h
new file mode 100644
index 0000000..710b0cb
--- /dev/null
+++ b/BaS_gcc/include/mmu.h
@@ -0,0 +1,22 @@
+/*
+ * mmu.h
+ *
+ *  Created on: 01.08.2013
+ *      Author: froesm1
+ */
+
+#ifndef _MMU_H_
+#define _MMU_H_
+
+#define STD_MMUTR	(MCF_MMU_MMUTR_SG | MCF_MMU_MMUTR_V)
+#define MMUORD_D	(MCF_MMU_MMUOR_ACC | MCF_MMU_MMUOR_UAA)
+#define MMUORD_I	(MCF_MMU_MMUOR_ITLB | MCF_MMU_MUOR_ACC | MCF_MMU_MMUOR_UAA)
+
+#define WRITETHROUGH_MMUDR		(MCF_MMU_MMUDR_SZ(00) | MCF_MMU_MMUDR_CM(00) | MCF_MMU_MMUDR_R | MCF_MMU_MMUDR_W | MCF_MMU_MMUDR_X)
+#define COPYBACK_MMUDR			(MCF_MMU_MMUDR_SZ(00) | MCF_MMU_MMUDR_CM(01) | MCF_MMU_MMUDR_R | MCF_MMU_MMUDR_W | MCF_MMU_MMUDR_X)
+#define NOCACHE_PRECISE_MMUDR	(MCF_MMU_MMUDR_SZ(00) | MCF_MMU_MMUDR_CM(10) | MCF_MMU_MMUDR_R | MCF_MMU_MMUDR_W | MCF_MMU_MMUDR_X)
+
+extern void mmu_init(void);
+extern void mmutr_miss(void) __attribute__((interrupt));
+
+#endif /* _MMU_H_ */
diff --git a/BaS_gcc/sources/mmu.S b/BaS_gcc/sources/mmu.S
index 312d785..8b0ca55 100644
--- a/BaS_gcc/sources/mmu.S
+++ b/BaS_gcc/sources/mmu.S
@@ -138,7 +138,7 @@ _mmu_init:
 		move.l	d0,_video_tlb							// set page as video page
   		clr.l	_video_sbt								// clear time
 
-#ifdef _NOT_USED_
+
 //-------------------------------------------------------------------------------------
 // Make the TOS (in SDRAM) read-only
  		move.l	#__TOS+std_mmutr,d0
@@ -147,7 +147,6 @@ _mmu_init:
 		move.l	d1,MCF_MMU_MMUDR
  		move.l	d2,MCF_MMU_MMUOR						// setzen read only ?????? noch nicht
 		move.l	d3,MCF_MMU_MMUOR						// setzen
-#endif /* _NOT_USED_ */
 
 // 00f0'0000 locked		
 		move.l	#0x00f00000|std_mmutr,d0
diff --git a/BaS_gcc/sources/mmu.c b/BaS_gcc/sources/mmu.c
new file mode 100644
index 0000000..f34302c
--- /dev/null
+++ b/BaS_gcc/sources/mmu.c
@@ -0,0 +1,26 @@
+/*
+ * mmu.c
+ *
+ *  Created on: 01.08.2013
+ *      Author: froesm1
+ */
+
+
+#include <MCF5475.h>
+#include "mmu.h"
+
+void mmu_init(void)
+{
+	/*
+	 * set ASID and shadow register
+	 */
+	__asm__ __volatile__("clr.l d0\n\t"
+						 "movec d0,ASID\n\t"
+						 "move.l d0,_rt_asid\n\t");
+
+}
+
+
+__attribute__((interrupt)) void mmutr_miss(void)
+{
+}