1 files changed, 130 insertions, 0 deletions

diff --git a/include/asm-um/page.h b/include/asm-um/page.h
new file mode 100644
index 000000000000..3620a08dc9f3
--- /dev/null
+++ b/include/asm-um/page.h
@@ -0,0 +1,130 @@
+/*
+ * Copyright (C) 2000 - 2003 Jeff Dike (jdike@addtoit.com)
+ * Copyright 2003 PathScale, Inc.
+ * Licensed under the GPL
+ */
+
+#ifndef __UM_PAGE_H
+#define __UM_PAGE_H
+
+struct page;
+
+#include <linux/config.h>
+#include <asm/vm-flags.h>
+
+/* PAGE_SHIFT determines the page size */
+#define PAGE_SHIFT      12
+#define PAGE_SIZE       (1UL << PAGE_SHIFT)
+#define PAGE_MASK       (~(PAGE_SIZE-1))
+
+/*
+ * These are used to make use of C type-checking..
+ */
+
+#define clear_page(page)        memset((void *)(page), 0, PAGE_SIZE)
+#define copy_page(to,from)      memcpy((void *)(to), (void *)(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)
+
+#if defined(CONFIG_3_LEVEL_PGTABLES) && !defined(CONFIG_64_BIT)
+
+typedef struct { unsigned long pte_low, pte_high; } pte_t;
+typedef struct { unsigned long long pmd; } pmd_t;
+typedef struct { unsigned long pgd; } pgd_t;
+#define pte_val(x) ((x).pte_low | ((unsigned long long) (x).pte_high << 32))
+
+#define pte_get_bits(pte, bits) ((pte).pte_low & (bits))
+#define pte_set_bits(pte, bits) ((pte).pte_low |= (bits))
+#define pte_clear_bits(pte, bits) ((pte).pte_low &= ~(bits))
+#define pte_copy(to, from) ({ (to).pte_high = (from).pte_high; \
+                              smp_wmb(); \
+                              (to).pte_low = (from).pte_low; })
+#define pte_is_zero(pte) (!((pte).pte_low & ~_PAGE_NEWPAGE) && !(pte).pte_high)
+#define pte_set_val(pte, phys, prot) \
+        ({ (pte).pte_high = (phys) >> 32; \
+           (pte).pte_low = (phys) | pgprot_val(prot); })
+
+typedef unsigned long long pfn_t;
+typedef unsigned long long phys_t;
+
+#else
+
+typedef struct { unsigned long pte; } pte_t;
+typedef struct { unsigned long pgd; } pgd_t;
+
+#ifdef CONFIG_3_LEVEL_PGTABLES
+typedef struct { unsigned long pmd; } pmd_t;
+#define pmd_val(x)      ((x).pmd)
+#define __pmd(x) ((pmd_t) { (x) } )
+#endif
+
+#define pte_val(x)      ((x).pte)
+
+
+#define pte_get_bits(p, bits) ((p).pte & (bits))
+#define pte_set_bits(p, bits) ((p).pte |= (bits))
+#define pte_clear_bits(p, bits) ((p).pte &= ~(bits))
+#define pte_copy(to, from) ((to).pte = (from).pte)
+#define pte_is_zero(p) (!((p).pte & ~_PAGE_NEWPAGE))
+#define pte_set_val(p, phys, prot) (p).pte = (phys | pgprot_val(prot))
+
+typedef unsigned long pfn_t;
+typedef unsigned long phys_t;
+
+#endif
+
+typedef struct { unsigned long pgprot; } pgprot_t;
+
+#define pgd_val(x)      ((x).pgd)
+#define pgprot_val(x)   ((x).pgprot)
+
+#define __pte(x) ((pte_t) { (x) } )
+#define __pgd(x) ((pgd_t) { (x) } )
+#define __pgprot(x)     ((pgprot_t) { (x) } )
+
+/* to align the pointer to the (next) page boundary */
+#define PAGE_ALIGN(addr)        (((addr)+PAGE_SIZE-1)&PAGE_MASK)
+
+extern unsigned long uml_physmem;
+
+#define PAGE_OFFSET (uml_physmem)
+#define KERNELBASE PAGE_OFFSET
+
+#define __va_space (8*1024*1024)
+
+extern unsigned long to_phys(void *virt);
+extern void *to_virt(unsigned long phys);
+#define __pa(virt) to_phys((void *) virt)
+#define __va(phys) to_virt((unsigned long) phys)
+
+#define page_to_pfn(page) ((page) - mem_map)
+#define pfn_to_page(pfn) (mem_map + (pfn))
+
+#define phys_to_pfn(p) ((p) >> PAGE_SHIFT)
+#define pfn_to_phys(pfn) ((pfn) << PAGE_SHIFT)
+
+#define pfn_valid(pfn) ((pfn) < max_mapnr)
+#define virt_addr_valid(v) pfn_valid(phys_to_pfn(__pa(v)))
+
+/* Pure 2^n version of get_order */
+static __inline__ int get_order(unsigned long size)
+{
+        int order;
+
+        size = (size-1) >> (PAGE_SHIFT-1);
+        order = -1;
+        do {
+                size >>= 1;
+                order++;
+        } while (size);
+        return order;
+}
+
+extern struct page *arch_validate(struct page *page, int mask, int order);
+#define HAVE_ARCH_VALIDATE
+
+extern void arch_free_page(struct page *page, int order);
+#define HAVE_ARCH_FREE_PAGE
+
+#endif