/* * linux/include/asm-arm/memory.h * * Copyright (C) 2000-2002 Russell King * modification for nommu, Hyok S. Choi, 2004 * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * Note: this file should not be included by non-asm/.h files */ #ifndef __ASM_ARM_MEMORY_H #define __ASM_ARM_MEMORY_H /* * Allow for constants defined here to be used from assembly code * by prepending the UL suffix only with actual C code compilation. */ #ifndef __ASSEMBLY__ #define UL(x) (x##UL) #else #define UL(x) (x) #endif #include #include #include #ifdef CONFIG_MMU #ifndef TASK_SIZE /* * TASK_SIZE - the maximum size of a user space task. * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area */ #define TASK_SIZE UL(0xbf000000) #define TASK_UNMAPPED_BASE UL(0x40000000) #endif /* * The maximum size of a 26-bit user space task. */ #define TASK_SIZE_26 UL(0x04000000) /* * Page offset: 3GB */ #ifndef PAGE_OFFSET #define PAGE_OFFSET UL(0xc0000000) #endif /* * The module space lives between the addresses given by TASK_SIZE * and PAGE_OFFSET - it must be within 32MB of the kernel text. */ #define MODULE_END (PAGE_OFFSET) #define MODULE_START (MODULE_END - 16*1048576) #if TASK_SIZE > MODULE_START #error Top of user space clashes with start of module space #endif /* * The XIP kernel gets mapped at the bottom of the module vm area. * Since we use sections to map it, this macro replaces the physical address * with its virtual address while keeping offset from the base section. */ #define XIP_VIRT_ADDR(physaddr) (MODULE_START + ((physaddr) & 0x000fffff)) /* * Allow 2MB-aligned ioremap pages */ #define IOREMAP_MAX_ORDER 21 #else /* CONFIG_MMU */ /* * The limitation of user task size can grow up to the end of free ram region. * It is difficult to define and perhaps will never meet the original meaning * of this define that was meant to. * Fortunately, there is no reference for this in noMMU mode, for now. */ #ifndef TASK_SIZE #define TASK_SIZE (CONFIG_DRAM_SIZE) #endif #ifndef TASK_UNMAPPED_BASE #define TASK_UNMAPPED_BASE UL(0x00000000) #endif #ifndef PHYS_OFFSET #define PHYS_OFFSET (CONFIG_DRAM_BASE) #endif #ifndef END_MEM #define END_MEM (CONFIG_DRAM_BASE + CONFIG_DRAM_SIZE) #endif #ifndef PAGE_OFFSET #define PAGE_OFFSET (PHYS_OFFSET) #endif /* * The module can be at any place in ram in nommu mode. */ #define MODULE_END (END_MEM) #define MODULE_START (PHYS_OFFSET) #endif /* !CONFIG_MMU */ /* * Size of DMA-consistent memory region. Must be multiple of 2M, * between 2MB and 14MB inclusive. */ #ifndef CONSISTENT_DMA_SIZE #define CONSISTENT_DMA_SIZE SZ_2M #endif /* * Physical vs virtual RAM address space conversion. These are * private definitions which should NOT be used outside memory.h * files. Use virt_to_phys/phys_to_virt/__pa/__va instead. */ #ifndef __virt_to_phys #define __virt_to_phys(x) ((x) - PAGE_OFFSET + PHYS_OFFSET) #define __phys_to_virt(x) ((x) - PHYS_OFFSET + PAGE_OFFSET) #endif /* * Convert a physical address to a Page Frame Number and back */ #define __phys_to_pfn(paddr) ((paddr) >> PAGE_SHIFT) #define __pfn_to_phys(pfn) ((pfn) << PAGE_SHIFT) #ifndef __ASSEMBLY__ /* * The DMA mask corresponding to the maximum bus address allocatable * using GFP_DMA. The default here places no restriction on DMA * allocations. This must be the smallest DMA mask in the system, * so a successful GFP_DMA allocation will always satisfy this. */ #ifndef ISA_DMA_THRESHOLD #define ISA_DMA_THRESHOLD (0xffffffffULL) #endif #ifndef arch_adjust_zones #define arch_adjust_zones(node,size,holes) do { } while (0) #endif /* * PFNs are used to describe any physical page; this means * PFN 0 == physical address 0. * * This is the PFN of the first RAM page in the kernel * direct-mapped view. We assume this is the first page * of RAM in the mem_map as well. */ #define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT) /* * These are *only* valid on the kernel direct mapped RAM memory. * Note: Drivers should NOT use these. They are the wrong * translation for translating DMA addresses. Use the driver * DMA support - see dma-mapping.h. */ static inline unsigned long virt_to_phys(void *x) { return __virt_to_phys((unsigned long)(x)); } static inline void *phys_to_virt(unsigned long x) { return (void *)(__phys_to_virt((unsigned long)(x))); } /* * Drivers should NOT use these either. */ #define __pa(x) __virt_to_phys((unsigned long)(x)) #define __va(x) ((void *)__phys_to_virt((unsigned long)(x))) #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) /* * Virtual <-> DMA view memory address translations * Again, these are *only* valid on the kernel direct mapped RAM * memory. Use of these is *deprecated* (and that doesn't mean * use the __ prefixed forms instead.) See dma-mapping.h. */ static inline __deprecated unsigned long virt_to_bus(void *x) { return __virt_to_bus((unsigned long)x); } static inline __deprecated void *bus_to_virt(unsigned long x) { return (void *)__bus_to_virt(x); } /* * Conversion between a struct page and a physical address. * * Note: when converting an unknown physical address to a * struct page, the resulting pointer must be validated * using VALID_PAGE(). It must return an invalid struct page * for any physical address not corresponding to a system * RAM address. * * page_to_pfn(page) convert a struct page * to a PFN number * pfn_to_page(pfn) convert a _valid_ PFN number to struct page * * pfn_valid(pfn) indicates whether a PFN number is valid * * virt_to_page(k) convert a _valid_ virtual address to struct page * * virt_addr_valid(k) indicates whether a virtual address is valid */ #ifndef CONFIG_DISCONTIGMEM #define ARCH_PFN_OFFSET PHYS_PFN_OFFSET #define pfn_valid(pfn) ((pfn) >= PHYS_PFN_OFFSET && (pfn) < (PHYS_PFN_OFFSET + max_mapnr)) #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT) #define virt_addr_valid(kaddr) ((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory) #define PHYS_TO_NID(addr) (0) #else /* CONFIG_DISCONTIGMEM */ /* * This is more complex. We have a set of mem_map arrays spread * around in memory. */ #include #define arch_pfn_to_nid(pfn) PFN_TO_NID(pfn) #define arch_local_page_offset(pfn, nid) LOCAL_MAP_NR((pfn) << PAGE_SHIFT) #define pfn_valid(pfn) \ ({ \ unsigned int nid = PFN_TO_NID(pfn); \ int valid = nid < MAX_NUMNODES; \ if (valid) { \ pg_data_t *node = NODE_DATA(nid); \ valid = (pfn - node->node_start_pfn) < \ node->node_spanned_pages; \ } \ valid; \ }) #define virt_to_page(kaddr) \ (ADDR_TO_MAPBASE(kaddr) + LOCAL_MAP_NR(kaddr)) #define virt_addr_valid(kaddr) (KVADDR_TO_NID(kaddr) < MAX_NUMNODES) /* * Common discontigmem stuff. * PHYS_TO_NID is used by the ARM kernel/setup.c */ #define PHYS_TO_NID(addr) PFN_TO_NID((addr) >> PAGE_SHIFT) #endif /* !CONFIG_DISCONTIGMEM */ /* * For BIO. "will die". Kill me when bio_to_phys() and bvec_to_phys() die. */ #define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT) /* * Optional device DMA address remapping. Do _not_ use directly! * We should really eliminate virt_to_bus() here - it's deprecated. */ #ifndef __arch_page_to_dma #define page_to_dma(dev, page) ((dma_addr_t)__virt_to_bus((unsigned long)page_address(page))) #define dma_to_virt(dev, addr) ((void *)__bus_to_virt(addr)) #define virt_to_dma(dev, addr) ((dma_addr_t)__virt_to_bus((unsigned long)(addr))) #else #define page_to_dma(dev, page) (__arch_page_to_dma(dev, page)) #define dma_to_virt(dev, addr) (__arch_dma_to_virt(dev, addr)) #define virt_to_dma(dev, addr) (__arch_virt_to_dma(dev, addr)) #endif /* * Optional coherency support. Currently used only by selected * Intel XSC3-based systems. */ #ifndef arch_is_coherent #define arch_is_coherent() 0 #endif #endif #include #endif