mirror of https://gitee.com/openkylin/linux.git
118 lines
3.3 KiB
C
118 lines
3.3 KiB
C
/*
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* linux/arch/unicore32/include/asm/memory.h
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*
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* Code specific to PKUnity SoC and UniCore ISA
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*
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* Copyright (C) 2001-2010 GUAN Xue-tao
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Note: this file should not be included by non-asm/.h files
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*/
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#ifndef __UNICORE_MEMORY_H__
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#define __UNICORE_MEMORY_H__
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#include <linux/compiler.h>
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#include <linux/const.h>
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#include <asm/sizes.h>
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#include <mach/memory.h>
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/*
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* Allow for constants defined here to be used from assembly code
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* by prepending the UL suffix only with actual C code compilation.
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*/
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#define UL(x) _AC(x, UL)
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/*
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* PAGE_OFFSET - the virtual address of the start of the kernel image
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* TASK_SIZE - the maximum size of a user space task.
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* TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area
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*/
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#define PAGE_OFFSET UL(0xC0000000)
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#define TASK_SIZE (PAGE_OFFSET - UL(0x41000000))
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#define TASK_UNMAPPED_BASE (PAGE_OFFSET / 3)
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/*
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* The module space lives between the addresses given by TASK_SIZE
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* and PAGE_OFFSET - it must be within 32MB of the kernel text.
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*/
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#define MODULES_VADDR (PAGE_OFFSET - 16*1024*1024)
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#if TASK_SIZE > MODULES_VADDR
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#error Top of user space clashes with start of module space
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#endif
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#define MODULES_END (PAGE_OFFSET)
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/*
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* Allow 16MB-aligned ioremap pages
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*/
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#define IOREMAP_MAX_ORDER 24
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/*
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* Physical vs virtual RAM address space conversion. These are
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* private definitions which should NOT be used outside memory.h
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* files. Use virt_to_phys/phys_to_virt/__pa/__va instead.
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*/
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#ifndef __virt_to_phys
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#define __virt_to_phys(x) ((x) - PAGE_OFFSET + PHYS_OFFSET)
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#define __phys_to_virt(x) ((x) - PHYS_OFFSET + PAGE_OFFSET)
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#endif
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/*
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* Convert a physical address to a Page Frame Number and back
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*/
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#define __phys_to_pfn(paddr) ((paddr) >> PAGE_SHIFT)
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#define __pfn_to_phys(pfn) ((pfn) << PAGE_SHIFT)
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/*
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* Convert a page to/from a physical address
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*/
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#define page_to_phys(page) (__pfn_to_phys(page_to_pfn(page)))
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#define phys_to_page(phys) (pfn_to_page(__phys_to_pfn(phys)))
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#ifndef __ASSEMBLY__
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#ifndef arch_adjust_zones
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#define arch_adjust_zones(size, holes) do { } while (0)
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#endif
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/*
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* PFNs are used to describe any physical page; this means
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* PFN 0 == physical address 0.
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*
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* This is the PFN of the first RAM page in the kernel
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* direct-mapped view. We assume this is the first page
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* of RAM in the mem_map as well.
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*/
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#define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT)
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/*
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* Drivers should NOT use these either.
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*/
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#define __pa(x) __virt_to_phys((unsigned long)(x))
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#define __va(x) ((void *)__phys_to_virt((unsigned long)(x)))
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#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
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/*
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* Conversion between a struct page and a physical address.
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*
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* page_to_pfn(page) convert a struct page * to a PFN number
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* pfn_to_page(pfn) convert a _valid_ PFN number to struct page *
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*
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* virt_to_page(k) convert a _valid_ virtual address to struct page *
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* virt_addr_valid(k) indicates whether a virtual address is valid
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*/
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#define ARCH_PFN_OFFSET PHYS_PFN_OFFSET
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#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
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#define virt_addr_valid(kaddr) ((unsigned long)(kaddr) >= PAGE_OFFSET && \
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(unsigned long)(kaddr) < (unsigned long)high_memory)
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#endif
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#include <asm-generic/memory_model.h>
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#endif
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