1/*
2 *  linux/include/asm-arm26/memory.h
3 *
4 *  Copyright (C) 2000-2002 Russell King
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10 *  Note: this file should not be included by non-asm/.h files
11 */
12#ifndef __ASM_ARM_MEMORY_H
13#define __ASM_ARM_MEMORY_H
14
15/*
16 * User space: 26MB
17 */
18#define TASK_SIZE       (0x01a00000UL)
19
20/*
21 * This decides where the kernel will search for a free chunk of vm
22 * space during mmap's.
23 */
24#define TASK_UNMAPPED_BASE (TASK_SIZE / 3)
25
26/*
27 * Page offset: 32MB
28 */
29#define PAGE_OFFSET     (0x02000000UL)
30#define PHYS_OFFSET     (0x02000000UL)
31
32#define PHYS_TO_NID(addr)       (0)
33
34/*
35 * PFNs are used to describe any physical page; this means
36 * PFN 0 == physical address 0.
37 *
38 * This is the PFN of the first RAM page in the kernel
39 * direct-mapped view.  We assume this is the first page
40 * of RAM in the mem_map as well.
41 */
42#define PHYS_PFN_OFFSET	(PHYS_OFFSET >> PAGE_SHIFT)
43
44/*
45 * These are *only* valid on the kernel direct mapped RAM memory.
46 */
47static inline unsigned long virt_to_phys(void *x)
48{
49	return (unsigned long)x;
50}
51
52static inline void *phys_to_virt(unsigned long x)
53{
54	return (void *)((unsigned long)x);
55}
56
57#define __pa(x)			(unsigned long)(x)
58#define __va(x)			((void *)(unsigned long)(x))
59
60/*
61 * Virtual <-> DMA view memory address translations
62 * Again, these are *only* valid on the kernel direct mapped RAM
63 * memory.  Use of these is *deprecated*.
64 */
65#define virt_to_bus(x)		((unsigned long)(x))
66#define bus_to_virt(x)		((void *)((unsigned long)(x)))
67
68/*
69 * Conversion between a struct page and a physical address.
70 *
71 * Note: when converting an unknown physical address to a
72 * struct page, the resulting pointer must be validated
73 * using VALID_PAGE().  It must return an invalid struct page
74 * for any physical address not corresponding to a system
75 * RAM address.
76 *
77 *  page_to_pfn(page)	convert a struct page * to a PFN number
78 *  pfn_to_page(pfn)	convert a _valid_ PFN number to struct page *
79 *  pfn_valid(pfn)	indicates whether a PFN number is valid
80 *
81 *  virt_to_page(k)	convert a _valid_ virtual address to struct page *
82 *  virt_addr_valid(k)	indicates whether a virtual address is valid
83 */
84#define ARCH_PFN_OFFSET		(PHYS_PFN_OFFSET)
85#define pfn_valid(pfn)		((pfn) >= PHYS_PFN_OFFSET && (pfn) < (PHYS_PFN_OFFSET + max_mapnr))
86
87#define virt_to_page(kaddr)	(pfn_to_page(__pa(kaddr) >> PAGE_SHIFT))
88#define virt_addr_valid(kaddr)	((int)(kaddr) >= PAGE_OFFSET && (int)(kaddr) < (unsigned long)high_memory)
89
90/*
91 * For BIO.  "will die".  Kill me when bio_to_phys() and bvec_to_phys() die.
92 */
93#define page_to_phys(page)	(page_to_pfn(page) << PAGE_SHIFT)
94
95/*
96 * We should really eliminate virt_to_bus() here - it's deprecated.
97 */
98#define page_to_bus(page)	(page_address(page))
99
100#include <asm-generic/memory_model.h>
101#endif
102