1 files changed, 91 insertions, 44 deletions

diff --git a/include/asm-generic/page.h b/include/asm-generic/page.h
index b55052ce233..37d1fe28960 100644
--- a/include/asm-generic/page.h
+++ b/include/asm-generic/page.h
@@ -1,56 +1,103 @@
-#ifndef _ASM_GENERIC_PAGE_H
-#define _ASM_GENERIC_PAGE_H
+#ifndef __ASM_GENERIC_PAGE_H
+#define __ASM_GENERIC_PAGE_H
+/*
+ * Generic page.h implementation, for NOMMU architectures.
+ * This provides the dummy definitions for the memory management.
+ */
+
+#ifdef CONFIG_MMU
+#error need to prove a real asm/page.h
+#endif
+
+
+/* PAGE_SHIFT determines the page size */
+
+#define PAGE_SHIFT	12
+#ifdef __ASSEMBLY__
+#define PAGE_SIZE	(1 << PAGE_SHIFT)
+#else
+#define PAGE_SIZE	(1UL << PAGE_SHIFT)
+#endif
+#define PAGE_MASK	(~(PAGE_SIZE-1))
+
+#include <asm/setup.h>
 
-#ifdef __KERNEL__
 #ifndef __ASSEMBLY__
 
-#include <linux/log2.h>
+#define get_user_page(vaddr)		__get_free_page(GFP_KERNEL)
+#define free_user_page(page, addr)	free_page(addr)
+
+#define clear_page(page)	memset((page), 0, PAGE_SIZE)
+#define copy_page(to,from)	memcpy((to), (from), PAGE_SIZE)
+
+#define clear_user_page(page, vaddr, pg)	clear_page(page)
+#define copy_user_page(to, from, vaddr, pg)	copy_page(to, from)
 
 /*
- * non-const pure 2^n version of get_order
- * - the arch may override these in asm/bitops.h if they can be implemented
- *   more efficiently than using the arch log2 routines
- * - we use the non-const log2() instead if the arch has defined one suitable
+ * These are used to make use of C type-checking..
  */
-#ifndef ARCH_HAS_GET_ORDER
-static inline __attribute__((const))
-int __get_order(unsigned long size, int page_shift)
-{
-#if BITS_PER_LONG == 32 && defined(ARCH_HAS_ILOG2_U32)
-	int order = __ilog2_u32(size) - page_shift;
-	return order >= 0 ? order : 0;
-#elif BITS_PER_LONG == 64 && defined(ARCH_HAS_ILOG2_U64)
-	int order = __ilog2_u64(size) - page_shift;
-	return order >= 0 ? order : 0;
+typedef struct {
+	unsigned long pte;
+} pte_t;
+typedef struct {
+	unsigned long pmd[16];
+} pmd_t;
+typedef struct {
+	unsigned long pgd;
+} pgd_t;
+typedef struct {
+	unsigned long pgprot;
+} pgprot_t;
+typedef struct page *pgtable_t;
+
+#define pte_val(x)	((x).pte)
+#define pmd_val(x)	((&x)->pmd[0])
+#define pgd_val(x)	((x).pgd)
+#define pgprot_val(x)	((x).pgprot)
+
+#define __pte(x)	((pte_t) { (x) } )
+#define __pmd(x)	((pmd_t) { (x) } )
+#define __pgd(x)	((pgd_t) { (x) } )
+#define __pgprot(x)	((pgprot_t) { (x) } )
+
+extern unsigned long memory_start;
+extern unsigned long memory_end;
+
+#endif /* !__ASSEMBLY__ */
+
+#ifdef CONFIG_KERNEL_RAM_BASE_ADDRESS
+#define PAGE_OFFSET		(CONFIG_KERNEL_RAM_BASE_ADDRESS)
 #else
-	int order;
-
-	size = (size - 1) >> (page_shift - 1);
-	order = -1;
-	do {
-		size >>= 1;
-		order++;
-	} while (size);
-	return order;
+#define PAGE_OFFSET		(0)
 #endif
-}
+
+#ifndef ARCH_PFN_OFFSET
+#define ARCH_PFN_OFFSET		(PAGE_OFFSET >> PAGE_SHIFT)
 #endif
 
-/**
- * get_order - calculate log2(pages) to hold a block of the specified size
- * @n - size
- *
- * calculate allocation order based on the current page size
- * - this can be used to initialise global variables from constant data
- */
-#define get_order(n)							\
-(									\
-	__builtin_constant_p(n) ?					\
-	((n < (1UL << PAGE_SHIFT)) ? 0 : ilog2(n) - PAGE_SHIFT) :	\
-	__get_order(n, PAGE_SHIFT)					\
- )
+#ifndef __ASSEMBLY__
+
+#define __va(x) ((void *)((unsigned long) (x)))
+#define __pa(x) ((unsigned long) (x))
+
+#define virt_to_pfn(kaddr)	(__pa(kaddr) >> PAGE_SHIFT)
+#define pfn_to_virt(pfn)	__va((pfn) << PAGE_SHIFT)
+
+#define virt_to_page(addr)	pfn_to_page(virt_to_pfn(addr))
+#define page_to_virt(page)	pfn_to_virt(page_to_pfn(page))
+
+#ifndef page_to_phys
+#define page_to_phys(page)      ((dma_addr_t)page_to_pfn(page) << PAGE_SHIFT)
+#endif
+
+#define pfn_valid(pfn)		((pfn) >= ARCH_PFN_OFFSET && ((pfn) - ARCH_PFN_OFFSET) < max_mapnr)
+
+#define	virt_addr_valid(kaddr)	(((void *)(kaddr) >= (void *)PAGE_OFFSET) && \
+				((void *)(kaddr) < (void *)memory_end))
+
+#endif /* __ASSEMBLY__ */
 
-#endif	/* __ASSEMBLY__ */
-#endif	/* __KERNEL__ */
+#include <asm-generic/memory_model.h>
+#include <asm-generic/getorder.h>
 
-#endif	/* _ASM_GENERIC_PAGE_H */
+#endif /* __ASM_GENERIC_PAGE_H */