| /* |
| * arch/arm/include/asm/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 |
| |
| #include <linux/compiler.h> |
| #include <linux/const.h> |
| #include <mach/memory.h> |
| #include <asm/sizes.h> |
| |
| /* |
| * Allow for constants defined here to be used from assembly code |
| * by prepending the UL suffix only with actual C code compilation. |
| */ |
| #define UL(x) _AC(x, UL) |
| |
| #ifdef CONFIG_MMU |
| |
| /* |
| * PAGE_OFFSET - the virtual address of the start of the kernel image |
| * TASK_SIZE - the maximum size of a user space task. |
| * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area |
| */ |
| #define PAGE_OFFSET UL(CONFIG_PAGE_OFFSET) |
| #define TASK_SIZE (UL(CONFIG_PAGE_OFFSET) - UL(0x01000000)) |
| #define TASK_UNMAPPED_BASE (UL(CONFIG_PAGE_OFFSET) / 3) |
| |
| /* |
| * The maximum size of a 26-bit user space task. |
| */ |
| #define TASK_SIZE_26 UL(0x04000000) |
| |
| /* |
| * The module space lives between the addresses given by TASK_SIZE |
| * and PAGE_OFFSET - it must be within 32MB of the kernel text. |
| */ |
| #define MODULES_END (PAGE_OFFSET) |
| #define MODULES_VADDR (MODULES_END - 16*1048576) |
| |
| #if TASK_SIZE > MODULES_VADDR |
| #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) (MODULES_VADDR + ((physaddr) & 0x000fffff)) |
| |
| /* |
| * Allow 16MB-aligned ioremap pages |
| */ |
| #define IOREMAP_MAX_ORDER 24 |
| |
| #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 MODULES_END (END_MEM) |
| #define MODULES_VADDR (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. |
| */ |
| #define __virt_to_phys(x) ((x) - PAGE_OFFSET + PHYS_OFFSET) |
| #define __phys_to_virt(x) ((x) - PHYS_OFFSET + PAGE_OFFSET) |
| |
| /* |
| * 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) |
| #elif !defined(CONFIG_ZONE_DMA) |
| #error "custom arch_adjust_zones() requires CONFIG_ZONE_DMA" |
| #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. |
| */ |
| #ifndef __virt_to_bus |
| #define __virt_to_bus __virt_to_phys |
| #define __bus_to_virt __phys_to_virt |
| #endif |
| |
| 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 |
| |
| #ifndef CONFIG_SPARSEMEM |
| #define pfn_valid(pfn) ((pfn) >= PHYS_PFN_OFFSET && (pfn) < (PHYS_PFN_OFFSET + max_mapnr)) |
| #endif |
| |
| #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 <linux/numa.h> |
| |
| #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) |
| |
| /* |
| * Given a kaddr, ADDR_TO_MAPBASE finds the owning node of the memory |
| * and returns the mem_map of that node. |
| */ |
| #define ADDR_TO_MAPBASE(kaddr) NODE_MEM_MAP(KVADDR_TO_NID(kaddr)) |
| |
| /* |
| * Given a page frame number, find the owning node of the memory |
| * and returns the mem_map of that node. |
| */ |
| #define PFN_TO_MAPBASE(pfn) NODE_MEM_MAP(PFN_TO_NID(pfn)) |
| |
| #ifdef NODE_MEM_SIZE_BITS |
| #define NODE_MEM_SIZE_MASK ((1 << NODE_MEM_SIZE_BITS) - 1) |
| |
| /* |
| * Given a kernel address, find the home node of the underlying memory. |
| */ |
| #define KVADDR_TO_NID(addr) \ |
| (((unsigned long)(addr) - PAGE_OFFSET) >> NODE_MEM_SIZE_BITS) |
| |
| /* |
| * Given a page frame number, convert it to a node id. |
| */ |
| #define PFN_TO_NID(pfn) \ |
| (((pfn) - PHYS_PFN_OFFSET) >> (NODE_MEM_SIZE_BITS - PAGE_SHIFT)) |
| |
| /* |
| * Given a kaddr, LOCAL_MEM_MAP finds the owning node of the memory |
| * and returns the index corresponding to the appropriate page in the |
| * node's mem_map. |
| */ |
| #define LOCAL_MAP_NR(addr) \ |
| (((unsigned long)(addr) & NODE_MEM_SIZE_MASK) >> PAGE_SHIFT) |
| |
| #endif /* NODE_MEM_SIZE_BITS */ |
| |
| #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 coherency support. Currently used only by selected |
| * Intel XSC3-based systems. |
| */ |
| #ifndef arch_is_coherent |
| #define arch_is_coherent() 0 |
| #endif |
| |
| #endif |
| |
| #include <asm-generic/memory_model.h> |
| |
| #endif |