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b50f1704 G |
1 | /* |
2 | * linux/arch/unicore32/include/asm/memory.h | |
3 | * | |
4 | * Code specific to PKUnity SoC and UniCore ISA | |
5 | * | |
6 | * Copyright (C) 2001-2010 GUAN Xue-tao | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | * | |
12 | * Note: this file should not be included by non-asm/.h files | |
13 | */ | |
14 | #ifndef __UNICORE_MEMORY_H__ | |
15 | #define __UNICORE_MEMORY_H__ | |
16 | ||
17 | #include <linux/compiler.h> | |
18 | #include <linux/const.h> | |
19 | #include <asm/sizes.h> | |
20 | #include <mach/memory.h> | |
21 | ||
b50f1704 G |
22 | /* |
23 | * PAGE_OFFSET - the virtual address of the start of the kernel image | |
24 | * TASK_SIZE - the maximum size of a user space task. | |
25 | * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area | |
26 | */ | |
27 | #define PAGE_OFFSET UL(0xC0000000) | |
28 | #define TASK_SIZE (PAGE_OFFSET - UL(0x41000000)) | |
29 | #define TASK_UNMAPPED_BASE (PAGE_OFFSET / 3) | |
30 | ||
31 | /* | |
32 | * The module space lives between the addresses given by TASK_SIZE | |
33 | * and PAGE_OFFSET - it must be within 32MB of the kernel text. | |
34 | */ | |
35 | #define MODULES_VADDR (PAGE_OFFSET - 16*1024*1024) | |
36 | #if TASK_SIZE > MODULES_VADDR | |
37 | #error Top of user space clashes with start of module space | |
38 | #endif | |
39 | ||
40 | #define MODULES_END (PAGE_OFFSET) | |
41 | ||
42 | /* | |
43 | * Allow 16MB-aligned ioremap pages | |
44 | */ | |
45 | #define IOREMAP_MAX_ORDER 24 | |
46 | ||
47 | /* | |
48 | * Physical vs virtual RAM address space conversion. These are | |
49 | * private definitions which should NOT be used outside memory.h | |
50 | * files. Use virt_to_phys/phys_to_virt/__pa/__va instead. | |
51 | */ | |
52 | #ifndef __virt_to_phys | |
53 | #define __virt_to_phys(x) ((x) - PAGE_OFFSET + PHYS_OFFSET) | |
54 | #define __phys_to_virt(x) ((x) - PHYS_OFFSET + PAGE_OFFSET) | |
55 | #endif | |
56 | ||
b50f1704 G |
57 | /* |
58 | * Convert a page to/from a physical address | |
59 | */ | |
60 | #define page_to_phys(page) (__pfn_to_phys(page_to_pfn(page))) | |
61 | #define phys_to_page(phys) (pfn_to_page(__phys_to_pfn(phys))) | |
62 | ||
63 | #ifndef __ASSEMBLY__ | |
64 | ||
65 | #ifndef arch_adjust_zones | |
66 | #define arch_adjust_zones(size, holes) do { } while (0) | |
67 | #endif | |
68 | ||
69 | /* | |
70 | * PFNs are used to describe any physical page; this means | |
71 | * PFN 0 == physical address 0. | |
72 | * | |
73 | * This is the PFN of the first RAM page in the kernel | |
74 | * direct-mapped view. We assume this is the first page | |
75 | * of RAM in the mem_map as well. | |
76 | */ | |
77 | #define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT) | |
78 | ||
79 | /* | |
80 | * Drivers should NOT use these either. | |
81 | */ | |
82 | #define __pa(x) __virt_to_phys((unsigned long)(x)) | |
83 | #define __va(x) ((void *)__phys_to_virt((unsigned long)(x))) | |
84 | #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) | |
85 | ||
86 | /* | |
87 | * Conversion between a struct page and a physical address. | |
88 | * | |
b50f1704 G |
89 | * page_to_pfn(page) convert a struct page * to a PFN number |
90 | * pfn_to_page(pfn) convert a _valid_ PFN number to struct page * | |
91 | * | |
92 | * virt_to_page(k) convert a _valid_ virtual address to struct page * | |
93 | * virt_addr_valid(k) indicates whether a virtual address is valid | |
94 | */ | |
95 | #define ARCH_PFN_OFFSET PHYS_PFN_OFFSET | |
96 | ||
97 | #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT) | |
98 | #define virt_addr_valid(kaddr) ((unsigned long)(kaddr) >= PAGE_OFFSET && \ | |
99 | (unsigned long)(kaddr) < (unsigned long)high_memory) | |
100 | ||
101 | #endif | |
102 | ||
103 | #include <asm-generic/memory_model.h> | |
104 | ||
105 | #endif |