-#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 __ASSEMBLY__
+
+#define __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET))
+#define __pa(x) ((unsigned long) (x) - PAGE_OFFSET)
+
+#define virt_to_pfn(kaddr) (__pa(kaddr) >> PAGE_SHIFT)
+#define pfn_to_virt(pfn) __va((pfn) << PAGE_SHIFT)
+
+#define virt_to_page(addr) (mem_map + (((unsigned long)(addr)-PAGE_OFFSET) >> PAGE_SHIFT))
+#define page_to_virt(page) ((((page) - mem_map) << PAGE_SHIFT) + PAGE_OFFSET)
+
+#ifndef page_to_phys
+#define page_to_phys(page) ((dma_addr_t)page_to_pfn(page) << 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) \
- )
+#define pfn_valid(pfn) ((pfn) < 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 */
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff