diff --git a/headers/private/kernel/arch/ppc/arch_cpu.h b/headers/private/kernel/arch/ppc/arch_cpu.h
index 0800c4bc70..5b5104bb2e 100644
--- a/headers/private/kernel/arch/ppc/arch_cpu.h
+++ b/headers/private/kernel/arch/ppc/arch_cpu.h
@@ -17,4 +17,15 @@
 struct iframe {
 };
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+extern uint32 get_sdr1(void);
+extern uint32 set_sdr1(uint32 value);
+
+#ifdef __cplusplus
+}
+#endif
+
 #endif	/* _KERNEL_ARCH_PPC_CPU_H */
diff --git a/headers/private/kernel/arch/ppc/arch_mmu.h b/headers/private/kernel/arch/ppc/arch_mmu.h
new file mode 100644
index 0000000000..8f9751a9cf
--- /dev/null
+++ b/headers/private/kernel/arch/ppc/arch_mmu.h
@@ -0,0 +1,91 @@
+/*
+** Copyright 2003, Axel Dörfler, axeld@pinc-software.de. All rights reserved.
+** Distributed under the terms of the OpenBeOS License.
+*/
+#ifndef _KERNEL_ARCH_PPC_MMU_H
+#define _KERNEL_ARCH_PPC_MMU_H
+
+
+#include <SupportDefs.h>
+
+
+enum bat_length {
+	BAT_LENGTH_128kB	= 0x0000,
+	BAT_LENGTH_256kB	= 0x0001,
+	BAT_LENGTH_512kB	= 0x0003,
+	BAT_LENGTH_1MB		= 0x0007,
+	BAT_LENGTH_2MB		= 0x000f,
+	BAT_LENGTH_4MB		= 0x001f,
+	BAT_LENGTH_8MB		= 0x003f,
+	BAT_LENGTH_16MB		= 0x007f,
+	BAT_LENGTH_32MB		= 0x00ff,
+	BAT_LENGTH_64MB		= 0x01ff,
+	BAT_LENGTH_128MB	= 0x03ff,
+	BAT_LENGTH_256MB	= 0x07ff,
+};
+
+enum bat_protection {
+	BAT_READ_ONLY = 1,
+	BAT_READ_WRITE = 2,
+};
+
+struct block_address_translation {
+	// upper 32 bit
+	uint32	page_index : 15;				// BEPI, block effective page index
+	uint32	_reserved0 : 3;
+	uint32	length : 10;
+	uint32	kernel_valid : 1;
+	uint32	user_valid : 1;
+	// lower 32 bit
+	uint32	write_through : 1;				// WIMG
+	uint32	caching_inhibited : 1;
+	uint32	memory_coherent : 1;
+	uint32	guarded : 1;
+	uint32	_reserved1 : 1;
+	uint32	protection : 2;
+
+	void Reset()
+	{
+		*((uint32 *)this) = 0;
+	}
+};
+
+struct segment_descriptor {
+	uint32	type : 1;						// 0 for page translation descriptors
+	uint32	kernel_protection_key : 1;		// Ks, Supervisor-state protection key
+	uint32	user_protection_key : 1;		// Kp, User-state protection key
+	uint32	no_execute_protection : 1;
+	uint32	_reserved : 4;
+	uint32	virtual_segment_id : 24;
+};
+
+struct page_table_entry {
+	// upper 32 bit
+	uint32	valid : 1;
+	uint32	virtual_segment_id : 24;
+	uint32	hash : 1;
+	uint32	abbr_page_index : 6;
+	// lower 32 bit
+	uint32	physical_page_number : 20;
+	uint32	_reserved0 : 3;
+	uint32	referenced : 1;
+	uint32	changed : 1;
+	uint32	write_through : 1;				// WIMG
+	uint32	caching_inhibited : 1;
+	uint32	memory_coherent : 1;
+	uint32	guarded : 1;
+	uint32	_reserved1 : 1;
+	uint32	page_protection : 2;
+
+	static uint32 PrimaryHash(uint32 virtualSegmentID, uint32 virtualAddress);
+	static uint32 SecondaryHash(uint32 virtualSegmentID, uint32 virtualAddress);
+};
+
+struct page_table_entry_group {
+	struct page_table_entry entry[8];
+};
+
+extern void ppc_get_page_table(void **_pageTable, size_t *_size);
+extern void ppc_set_page_table(void *pageTable, size_t size);
+
+#endif	/* _KERNEL_ARCH_PPC_MMU_H */