]>
git.proxmox.com Git - mirror_ubuntu-zesty-kernel.git/blob - arch/unicore32/include/asm/memory.h
2 * linux/arch/unicore32/include/asm/memory.h
4 * Code specific to PKUnity SoC and UniCore ISA
6 * Copyright (C) 2001-2010 GUAN Xue-tao
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.
12 * Note: this file should not be included by non-asm/.h files
14 #ifndef __UNICORE_MEMORY_H__
15 #define __UNICORE_MEMORY_H__
17 #include <linux/compiler.h>
18 #include <linux/const.h>
19 #include <asm/sizes.h>
20 #include <mach/memory.h>
23 * Allow for constants defined here to be used from assembly code
24 * by prepending the UL suffix only with actual C code compilation.
26 #define UL(x) _AC(x, UL)
29 * PAGE_OFFSET - the virtual address of the start of the kernel image
30 * TASK_SIZE - the maximum size of a user space task.
31 * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area
33 #define PAGE_OFFSET UL(0xC0000000)
34 #define TASK_SIZE (PAGE_OFFSET - UL(0x41000000))
35 #define TASK_UNMAPPED_BASE (PAGE_OFFSET / 3)
38 * The module space lives between the addresses given by TASK_SIZE
39 * and PAGE_OFFSET - it must be within 32MB of the kernel text.
41 #define MODULES_VADDR (PAGE_OFFSET - 16*1024*1024)
42 #if TASK_SIZE > MODULES_VADDR
43 #error Top of user space clashes with start of module space
46 #define MODULES_END (PAGE_OFFSET)
49 * Allow 16MB-aligned ioremap pages
51 #define IOREMAP_MAX_ORDER 24
54 * Physical vs virtual RAM address space conversion. These are
55 * private definitions which should NOT be used outside memory.h
56 * files. Use virt_to_phys/phys_to_virt/__pa/__va instead.
58 #ifndef __virt_to_phys
59 #define __virt_to_phys(x) ((x) - PAGE_OFFSET + PHYS_OFFSET)
60 #define __phys_to_virt(x) ((x) - PHYS_OFFSET + PAGE_OFFSET)
64 * Convert a physical address to a Page Frame Number and back
66 #define __phys_to_pfn(paddr) ((paddr) >> PAGE_SHIFT)
67 #define __pfn_to_phys(pfn) ((pfn) << PAGE_SHIFT)
70 * Convert a page to/from a physical address
72 #define page_to_phys(page) (__pfn_to_phys(page_to_pfn(page)))
73 #define phys_to_page(phys) (pfn_to_page(__phys_to_pfn(phys)))
77 #ifndef arch_adjust_zones
78 #define arch_adjust_zones(size, holes) do { } while (0)
82 * PFNs are used to describe any physical page; this means
83 * PFN 0 == physical address 0.
85 * This is the PFN of the first RAM page in the kernel
86 * direct-mapped view. We assume this is the first page
87 * of RAM in the mem_map as well.
89 #define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT)
92 * Drivers should NOT use these either.
94 #define __pa(x) __virt_to_phys((unsigned long)(x))
95 #define __va(x) ((void *)__phys_to_virt((unsigned long)(x)))
96 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
99 * Conversion between a struct page and a physical address.
101 * Note: when converting an unknown physical address to a
102 * struct page, the resulting pointer must be validated
103 * using VALID_PAGE(). It must return an invalid struct page
104 * for any physical address not corresponding to a system
107 * page_to_pfn(page) convert a struct page * to a PFN number
108 * pfn_to_page(pfn) convert a _valid_ PFN number to struct page *
110 * virt_to_page(k) convert a _valid_ virtual address to struct page *
111 * virt_addr_valid(k) indicates whether a virtual address is valid
113 #define ARCH_PFN_OFFSET PHYS_PFN_OFFSET
115 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
116 #define virt_addr_valid(kaddr) ((unsigned long)(kaddr) >= PAGE_OFFSET && \
117 (unsigned long)(kaddr) < (unsigned long)high_memory)
121 #include <asm-generic/memory_model.h>