[POWERPC] Start factoring pgtable-ppc32.h and pgtable-ppc64.h

This factors some things defined in both pgtable-ppc32.h and
pgtable-ppc64.h into the common part of asm-powerpc/pgtable.h.  These
are all things which have essentially identical definitions, and which
by their nature are very unlikely ever to need different definitions
in the two cases.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 28 insertions, 0 deletions

diff --git a/include/asm-powerpc/pgtable.h b/include/asm-powerpc/pgtable.h
index 78bf4ae712a6..d18ffe7bc7c4 100644
--- a/include/asm-powerpc/pgtable.h
+++ b/include/asm-powerpc/pgtable.h
@@ -2,6 +2,13 @@
 #define _ASM_POWERPC_PGTABLE_H
 #ifdef __KERNEL__
 
+#ifndef __ASSEMBLY__
+#include <asm/processor.h>              /* For TASK_SIZE */
+#include <asm/mmu.h>
+#include <asm/page.h>
+struct mm_struct;
+#endif /* !__ASSEMBLY__ */
+
 #if defined(CONFIG_PPC64)
 #  include <asm/pgtable-ppc64.h>
 #else
@@ -9,6 +16,27 @@
 #endif
 
 #ifndef __ASSEMBLY__
+/*
+ * ZERO_PAGE is a global shared page that is always zero: used
+ * for zero-mapped memory areas etc..
+ */
+extern unsigned long empty_zero_page[];
+#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
+
+extern pgd_t swapper_pg_dir[];
+
+extern void paging_init(void);
+
+/*
+ * kern_addr_valid is intended to indicate whether an address is a valid
+ * kernel address.  Most 32-bit archs define it as always true (like this)
+ * but most 64-bit archs actually perform a test.  What should we do here?
+ */
+#define kern_addr_valid(addr)   (1)
+
+#define io_remap_pfn_range(vma, vaddr, pfn, size, prot)         \
+                remap_pfn_range(vma, vaddr, pfn, size, prot)
+
 #include <asm-generic/pgtable.h>
 #endif /* __ASSEMBLY__ */