tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Copyright (C) 2004-2006 Atmel Corporation
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
7 */
8#ifndef __ASM_AVR32_PAGE_H
9#define __ASM_AVR32_PAGE_H
10
11#include <linux/const.h>
12
13/* PAGE_SHIFT determines the page size */
14#define PAGE_SHIFT 12
15#define PAGE_SIZE (_AC(1, UL) << PAGE_SHIFT)
16#define PAGE_MASK (~(PAGE_SIZE-1))
17#define PTE_MASK PAGE_MASK
18
19#ifndef __ASSEMBLY__
20
21#include <asm/addrspace.h>
22
23extern void clear_page(void *to);
24extern void copy_page(void *to, void *from);
25
26#define clear_user_page(page, vaddr, pg) clear_page(page)
27#define copy_user_page(to, from, vaddr, pg) copy_page(to, from)
28
29/*
30 * These are used to make use of C type-checking..
31 */
32typedef struct { unsigned long pte; } pte_t;
33typedef struct { unsigned long pgd; } pgd_t;
34typedef struct { unsigned long pgprot; } pgprot_t;
35typedef struct page *pgtable_t;
36
37#define pte_val(x) ((x).pte)
38#define pgd_val(x) ((x).pgd)
39#define pgprot_val(x) ((x).pgprot)
40
41#define __pte(x) ((pte_t) { (x) })
42#define __pgd(x) ((pgd_t) { (x) })
43#define __pgprot(x) ((pgprot_t) { (x) })
44
45/* FIXME: These should be removed soon */
46extern unsigned long memory_start, memory_end;
47
48/* Pure 2^n version of get_order */
49static inline int get_order(unsigned long size)
50{
51 unsigned lz;
52
53 size = (size - 1) >> PAGE_SHIFT;
54 asm("clz %0, %1" : "=r"(lz) : "r"(size));
55 return 32 - lz;
56}
57
58#endif /* !__ASSEMBLY__ */
59
60/* Align the pointer to the (next) page boundary */
61#define PAGE_ALIGN(addr) (((addr) + PAGE_SIZE - 1) & PAGE_MASK)
62
63/*
64 * The hardware maps the virtual addresses 0x80000000 -> 0x9fffffff
65 * permanently to the physical addresses 0x00000000 -> 0x1fffffff when
66 * segmentation is enabled. We want to make use of this in order to
67 * minimize TLB pressure.
68 */
69#define PAGE_OFFSET (0x80000000UL)
70
71/*
72 * ALSA uses virt_to_page() on DMA pages, which I'm not entirely sure
73 * is a good idea. Anyway, we can't simply subtract PAGE_OFFSET here
74 * in that case, so we'll have to mask out the three most significant
75 * bits of the address instead...
76 *
77 * What's the difference between __pa() and virt_to_phys() anyway?
78 */
79#define __pa(x) PHYSADDR(x)
80#define __va(x) ((void *)(P1SEGADDR(x)))
81
82#define MAP_NR(addr) (((unsigned long)(addr) - PAGE_OFFSET) >> PAGE_SHIFT)
83
84#define phys_to_page(phys) (pfn_to_page(phys >> PAGE_SHIFT))
85#define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
86
87#ifndef CONFIG_NEED_MULTIPLE_NODES
88
89#define PHYS_PFN_OFFSET (CONFIG_PHYS_OFFSET >> PAGE_SHIFT)
90
91#define pfn_to_page(pfn) (mem_map + ((pfn) - PHYS_PFN_OFFSET))
92#define page_to_pfn(page) ((unsigned long)((page) - mem_map) + PHYS_PFN_OFFSET)
93#define pfn_valid(pfn) ((pfn) >= PHYS_PFN_OFFSET && (pfn) < (PHYS_PFN_OFFSET + max_mapnr))
94#endif /* CONFIG_NEED_MULTIPLE_NODES */
95
96#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
97#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
98
99#define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | \
100 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
101
102/*
103 * Memory above this physical address will be considered highmem.
104 */
105#define HIGHMEM_START 0x20000000UL
106
107#endif /* __ASM_AVR32_PAGE_H */