324 lines
8.8 KiB
C
324 lines
8.8 KiB
C
/*
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* arch/arm/include/asm/memory.h
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*
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* Copyright (C) 2000-2002 Russell King
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* modification for nommu, Hyok S. Choi, 2004
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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 __ASM_ARM_MEMORY_H
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#define __ASM_ARM_MEMORY_H
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#include <linux/compiler.h>
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#include <linux/const.h>
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#include <mach/memory.h>
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#include <asm/sizes.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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#ifdef CONFIG_MMU
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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(CONFIG_PAGE_OFFSET)
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#define TASK_SIZE (UL(CONFIG_PAGE_OFFSET) - UL(0x01000000))
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#define TASK_UNMAPPED_BASE (UL(CONFIG_PAGE_OFFSET) / 3)
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/*
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* The maximum size of a 26-bit user space task.
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*/
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#define TASK_SIZE_26 UL(0x04000000)
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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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/*
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* The highmem pkmap virtual space shares the end of the module area.
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*/
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#ifdef CONFIG_HIGHMEM
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#define MODULES_END (PAGE_OFFSET - PMD_SIZE)
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#else
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#define MODULES_END (PAGE_OFFSET)
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#endif
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/*
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* The XIP kernel gets mapped at the bottom of the module vm area.
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* Since we use sections to map it, this macro replaces the physical address
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* with its virtual address while keeping offset from the base section.
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*/
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#define XIP_VIRT_ADDR(physaddr) (MODULES_VADDR + ((physaddr) & 0x000fffff))
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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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#else /* CONFIG_MMU */
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/*
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* The limitation of user task size can grow up to the end of free ram region.
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* It is difficult to define and perhaps will never meet the original meaning
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* of this define that was meant to.
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* Fortunately, there is no reference for this in noMMU mode, for now.
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*/
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#ifndef TASK_SIZE
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#define TASK_SIZE (CONFIG_DRAM_SIZE)
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#endif
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#ifndef TASK_UNMAPPED_BASE
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#define TASK_UNMAPPED_BASE UL(0x00000000)
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#endif
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#ifndef PHYS_OFFSET
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#define PHYS_OFFSET (CONFIG_DRAM_BASE)
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#endif
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#ifndef END_MEM
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#define END_MEM (CONFIG_DRAM_BASE + CONFIG_DRAM_SIZE)
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#endif
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#ifndef PAGE_OFFSET
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#define PAGE_OFFSET (PHYS_OFFSET)
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#endif
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/*
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* The module can be at any place in ram in nommu mode.
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*/
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#define MODULES_END (END_MEM)
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#define MODULES_VADDR (PHYS_OFFSET)
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#endif /* !CONFIG_MMU */
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/*
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* Size of DMA-consistent memory region. Must be multiple of 2M,
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* between 2MB and 14MB inclusive.
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*/
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#ifndef CONSISTENT_DMA_SIZE
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#define CONSISTENT_DMA_SIZE SZ_2M
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#endif
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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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#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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/*
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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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#ifndef __ASSEMBLY__
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/*
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* The DMA mask corresponding to the maximum bus address allocatable
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* using GFP_DMA. The default here places no restriction on DMA
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* allocations. This must be the smallest DMA mask in the system,
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* so a successful GFP_DMA allocation will always satisfy this.
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*/
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#ifndef ISA_DMA_THRESHOLD
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#define ISA_DMA_THRESHOLD (0xffffffffULL)
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#endif
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#ifndef arch_adjust_zones
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#define arch_adjust_zones(node,size,holes) do { } while (0)
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#elif !defined(CONFIG_ZONE_DMA)
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#error "custom arch_adjust_zones() requires CONFIG_ZONE_DMA"
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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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* These are *only* valid on the kernel direct mapped RAM memory.
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* Note: Drivers should NOT use these. They are the wrong
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* translation for translating DMA addresses. Use the driver
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* DMA support - see dma-mapping.h.
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*/
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static inline unsigned long virt_to_phys(void *x)
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{
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return __virt_to_phys((unsigned long)(x));
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}
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static inline void *phys_to_virt(unsigned long x)
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{
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return (void *)(__phys_to_virt((unsigned long)(x)));
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}
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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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* Virtual <-> DMA view memory address translations
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* Again, these are *only* valid on the kernel direct mapped RAM
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* memory. Use of these is *deprecated* (and that doesn't mean
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* use the __ prefixed forms instead.) See dma-mapping.h.
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*/
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#ifndef __virt_to_bus
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#define __virt_to_bus __virt_to_phys
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#define __bus_to_virt __phys_to_virt
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#define __pfn_to_bus(x) ((x) << PAGE_SHIFT)
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#endif
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static inline __deprecated unsigned long virt_to_bus(void *x)
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{
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return __virt_to_bus((unsigned long)x);
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}
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static inline __deprecated void *bus_to_virt(unsigned long x)
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{
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return (void *)__bus_to_virt(x);
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}
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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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* Note: when converting an unknown physical address to a
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* struct page, the resulting pointer must be validated
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* using VALID_PAGE(). It must return an invalid struct page
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* for any physical address not corresponding to a system
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* RAM 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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* pfn_valid(pfn) indicates whether a PFN number is valid
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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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#ifndef CONFIG_DISCONTIGMEM
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#define ARCH_PFN_OFFSET PHYS_PFN_OFFSET
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#ifndef CONFIG_SPARSEMEM
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#define pfn_valid(pfn) ((pfn) >= PHYS_PFN_OFFSET && (pfn) < (PHYS_PFN_OFFSET + max_mapnr))
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#endif
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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 && (unsigned long)(kaddr) < (unsigned long)high_memory)
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#define PHYS_TO_NID(addr) (0)
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#else /* CONFIG_DISCONTIGMEM */
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/*
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* This is more complex. We have a set of mem_map arrays spread
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* around in memory.
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*/
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#include <linux/numa.h>
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#define arch_pfn_to_nid(pfn) PFN_TO_NID(pfn)
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#define arch_local_page_offset(pfn, nid) LOCAL_MAP_NR((pfn) << PAGE_SHIFT)
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#define pfn_valid(pfn) \
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({ \
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unsigned int nid = PFN_TO_NID(pfn); \
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int valid = nid < MAX_NUMNODES; \
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if (valid) { \
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pg_data_t *node = NODE_DATA(nid); \
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valid = (pfn - node->node_start_pfn) < \
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node->node_spanned_pages; \
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} \
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valid; \
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})
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#define virt_to_page(kaddr) \
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(ADDR_TO_MAPBASE(kaddr) + LOCAL_MAP_NR(kaddr))
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#define virt_addr_valid(kaddr) (KVADDR_TO_NID(kaddr) < MAX_NUMNODES)
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/*
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* Common discontigmem stuff.
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* PHYS_TO_NID is used by the ARM kernel/setup.c
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*/
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#define PHYS_TO_NID(addr) PFN_TO_NID((addr) >> PAGE_SHIFT)
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/*
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* Given a kaddr, ADDR_TO_MAPBASE finds the owning node of the memory
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* and returns the mem_map of that node.
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*/
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#define ADDR_TO_MAPBASE(kaddr) NODE_MEM_MAP(KVADDR_TO_NID(kaddr))
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/*
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* Given a page frame number, find the owning node of the memory
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* and returns the mem_map of that node.
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*/
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#define PFN_TO_MAPBASE(pfn) NODE_MEM_MAP(PFN_TO_NID(pfn))
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#ifdef NODE_MEM_SIZE_BITS
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#define NODE_MEM_SIZE_MASK ((1 << NODE_MEM_SIZE_BITS) - 1)
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/*
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* Given a kernel address, find the home node of the underlying memory.
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*/
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#define KVADDR_TO_NID(addr) \
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(((unsigned long)(addr) - PAGE_OFFSET) >> NODE_MEM_SIZE_BITS)
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/*
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* Given a page frame number, convert it to a node id.
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*/
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#define PFN_TO_NID(pfn) \
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(((pfn) - PHYS_PFN_OFFSET) >> (NODE_MEM_SIZE_BITS - PAGE_SHIFT))
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/*
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* Given a kaddr, LOCAL_MEM_MAP finds the owning node of the memory
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* and returns the index corresponding to the appropriate page in the
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* node's mem_map.
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*/
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#define LOCAL_MAP_NR(addr) \
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(((unsigned long)(addr) & NODE_MEM_SIZE_MASK) >> PAGE_SHIFT)
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#endif /* NODE_MEM_SIZE_BITS */
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#endif /* !CONFIG_DISCONTIGMEM */
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/*
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* For BIO. "will die". Kill me when bio_to_phys() and bvec_to_phys() die.
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*/
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#define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
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/*
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* Optional coherency support. Currently used only by selected
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* Intel XSC3-based systems.
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*/
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#ifndef arch_is_coherent
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#define arch_is_coherent() 0
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#endif
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#endif
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#include <asm-generic/memory_model.h>
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#endif
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