/* * linux/include/asm-arm/memory.h * * Copyright (C) 2000-2002 Russell King * * 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 #include <linux/config.h> #include <asm/arch/memory.h> #ifndef __ASSEMBLY__ /* * 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))) /* * Virtual <-> DMA view memory address translations * Again, these are *only* valid on the kernel direct mapped RAM * memory. Use of these is *deprecated*. */ #define virt_to_bus(x) (__virt_to_bus((unsigned long)(x))) #define bus_to_virt(x) ((void *)(__bus_to_virt((unsigned long)(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 page_to_pfn(page) (((page) - mem_map) + PHYS_PFN_OFFSET) #define pfn_to_page(pfn) ((mem_map + (pfn)) - 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 /* * This is more complex. We have a set of mem_map arrays spread * around in memory. */ #define page_to_pfn(page) \ (( (page) - page_zone(page)->zone_mem_map) \ + page_zone(page)->zone_start_pfn) #define pfn_to_page(pfn) \ (PFN_TO_MAPBASE(pfn) + LOCAL_MAP_NR((pfn) << PAGE_SHIFT)) #define pfn_valid(pfn) (PFN_TO_NID(pfn) < NR_NODES) #define virt_to_page(kaddr) \ (ADDR_TO_MAPBASE(kaddr) + LOCAL_MAP_NR(kaddr)) #define virt_addr_valid(kaddr) (KVADDR_TO_NID(kaddr) < NR_NODES) /* * 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 /* * 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) /* * We should really eliminate virt_to_bus() here - it's deprecated. */ #define page_to_bus(page) (virt_to_bus(page_address(page))) #endif #endif