Linux kernel mirror (for testing)
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linux
1// SPDX-License-Identifier: GPL-2.0
2// Copyright (C) 2005-2017 Andes Technology Corporation
3
4#ifndef __ASM_NDS32_MEMORY_H
5#define __ASM_NDS32_MEMORY_H
6
7#include <linux/compiler.h>
8#include <linux/sizes.h>
9
10#ifndef __ASSEMBLY__
11#include <asm/page.h>
12#endif
13
14#ifndef PHYS_OFFSET
15#define PHYS_OFFSET (0x0)
16#endif
17
18#ifndef __virt_to_bus
19#define __virt_to_bus __virt_to_phys
20#endif
21
22#ifndef __bus_to_virt
23#define __bus_to_virt __phys_to_virt
24#endif
25
26/*
27 * TASK_SIZE - the maximum size of a user space task.
28 * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area
29 */
30#define TASK_SIZE ((CONFIG_PAGE_OFFSET) - (SZ_32M))
31#define TASK_UNMAPPED_BASE ALIGN(TASK_SIZE / 3, SZ_32M)
32#define PAGE_OFFSET (CONFIG_PAGE_OFFSET)
33
34/*
35 * Physical vs virtual RAM address space conversion. These are
36 * private definitions which should NOT be used outside memory.h
37 * files. Use virt_to_phys/phys_to_virt/__pa/__va instead.
38 */
39#ifndef __virt_to_phys
40#define __virt_to_phys(x) ((x) - PAGE_OFFSET + PHYS_OFFSET)
41#define __phys_to_virt(x) ((x) - PHYS_OFFSET + PAGE_OFFSET)
42#endif
43
44/*
45 * The module space lives between the addresses given by TASK_SIZE
46 * and PAGE_OFFSET - it must be within 32MB of the kernel text.
47 */
48#define MODULES_END (PAGE_OFFSET)
49#define MODULES_VADDR (MODULES_END - SZ_32M)
50
51#if TASK_SIZE > MODULES_VADDR
52#error Top of user space clashes with start of module space
53#endif
54
55#ifndef __ASSEMBLY__
56
57/*
58 * PFNs are used to describe any physical page; this means
59 * PFN 0 == physical address 0.
60 *
61 * This is the PFN of the first RAM page in the kernel
62 * direct-mapped view. We assume this is the first page
63 * of RAM in the mem_map as well.
64 */
65#define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT)
66
67/*
68 * Drivers should NOT use these either.
69 */
70#define __pa(x) __virt_to_phys((unsigned long)(x))
71#define __va(x) ((void *)__phys_to_virt((unsigned long)(x)))
72
73/*
74 * Conversion between a struct page and a physical address.
75 *
76 * Note: when converting an unknown physical address to a
77 * struct page, the resulting pointer must be validated
78 * using VALID_PAGE(). It must return an invalid struct page
79 * for any physical address not corresponding to a system
80 * RAM address.
81 *
82 * pfn_valid(pfn) indicates whether a PFN number is valid
83 *
84 * virt_to_page(k) convert a _valid_ virtual address to struct page *
85 * virt_addr_valid(k) indicates whether a virtual address is valid
86 */
87#ifndef CONFIG_DISCONTIGMEM
88
89#define ARCH_PFN_OFFSET PHYS_PFN_OFFSET
90#define pfn_valid(pfn) ((pfn) >= PHYS_PFN_OFFSET && (pfn) < (PHYS_PFN_OFFSET + max_mapnr))
91
92#define virt_to_page(kaddr) (pfn_to_page(__pa(kaddr) >> PAGE_SHIFT))
93#define virt_addr_valid(kaddr) ((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory)
94
95#else /* CONFIG_DISCONTIGMEM */
96#error CONFIG_DISCONTIGMEM is not supported yet.
97#endif /* !CONFIG_DISCONTIGMEM */
98
99#define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
100
101#endif
102
103#include <asm-generic/memory_model.h>
104
105#endif