This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / include / asm-avr32 / page.h

diff --git a/include/asm-avr32/page.h b/include/asm-avr32/page.h
new file mode 100644 (file)
index 0000000..0f630b3
--- /dev/null
+++ b/include/asm-avr32/page.h
@@ -0,0 +1,112 @@
+/*
+ * Copyright (C) 2004-2006 Atmel Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#ifndef __ASM_AVR32_PAGE_H
+#define __ASM_AVR32_PAGE_H
+
+#ifdef __KERNEL__
+
+/* 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))
+#define PTE_MASK       PAGE_MASK
+
+#ifndef __ASSEMBLY__
+
+#include <asm/addrspace.h>
+
+extern void clear_page(void *to);
+extern void copy_page(void *to, void *from);
+
+#define clear_user_page(page, vaddr, pg)       clear_page(page)
+#define copy_user_page(to, from, vaddr, pg)    copy_page(to, from)
+
+/*
+ * These are used to make use of C type-checking..
+ */
+typedef struct { unsigned long pte; } pte_t;
+typedef struct { unsigned long pgd; } pgd_t;
+typedef struct { unsigned long pgprot; } pgprot_t;
+
+#define pte_val(x)             ((x).pte)
+#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) })
+
+/* FIXME: These should be removed soon */
+extern unsigned long memory_start, memory_end;
+
+/* Pure 2^n version of get_order */
+static inline int get_order(unsigned long size)
+{
+       unsigned lz;
+
+       size = (size - 1) >> PAGE_SHIFT;
+       asm("clz %0, %1" : "=r"(lz) : "r"(size));
+       return 32 - lz;
+}
+
+#endif /* !__ASSEMBLY__ */
+
+/* Align the pointer to the (next) page boundary */
+#define PAGE_ALIGN(addr)       (((addr) + PAGE_SIZE - 1) & PAGE_MASK)
+
+/*
+ * The hardware maps the virtual addresses 0x80000000 -> 0x9fffffff
+ * permanently to the physical addresses 0x00000000 -> 0x1fffffff when
+ * segmentation is enabled. We want to make use of this in order to
+ * minimize TLB pressure.
+ */
+#define PAGE_OFFSET            (0x80000000UL)
+
+/*
+ * ALSA uses virt_to_page() on DMA pages, which I'm not entirely sure
+ * is a good idea. Anyway, we can't simply subtract PAGE_OFFSET here
+ * in that case, so we'll have to mask out the three most significant
+ * bits of the address instead...
+ *
+ * What's the difference between __pa() and virt_to_phys() anyway?
+ */
+#define __pa(x)                PHYSADDR(x)
+#define __va(x)                ((void *)(P1SEGADDR(x)))
+
+#define MAP_NR(addr)   (((unsigned long)(addr) - PAGE_OFFSET) >> PAGE_SHIFT)
+
+#define phys_to_page(phys)     (pfn_to_page(phys >> PAGE_SHIFT))
+#define page_to_phys(page)     (page_to_pfn(page) << PAGE_SHIFT)
+
+#ifndef CONFIG_NEED_MULTIPLE_NODES
+
+#define PHYS_PFN_OFFSET                (CONFIG_PHYS_OFFSET >> PAGE_SHIFT)
+
+#define pfn_to_page(pfn)       (mem_map + ((pfn) - PHYS_PFN_OFFSET))
+#define page_to_pfn(page)      ((unsigned long)((page) - mem_map) + PHYS_PFN_OFFSET)
+#define pfn_valid(pfn)         ((pfn) >= PHYS_PFN_OFFSET && (pfn) < (PHYS_PFN_OFFSET + max_mapnr))
+#endif /* CONFIG_NEED_MULTIPLE_NODES */
+
+#define virt_to_page(kaddr)    pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
+#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
+
+#define VM_DATA_DEFAULT_FLAGS  (VM_READ | VM_WRITE |   \
+                                VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
+
+/*
+ * Memory above this physical address will be considered highmem.
+ */
+#define HIGHMEM_START          0x20000000UL
+
+#endif /* __KERNEL__ */
+
+#endif /* __ASM_AVR32_PAGE_H */