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Diffstat (limited to 'arch/arm/include/asm/memory.h')
-rw-r--r-- | arch/arm/include/asm/memory.h | 334 |
1 files changed, 334 insertions, 0 deletions
diff --git a/arch/arm/include/asm/memory.h b/arch/arm/include/asm/memory.h new file mode 100644 index 000000000000..92069221dca9 --- /dev/null +++ b/arch/arm/include/asm/memory.h @@ -0,0 +1,334 @@ +/* + * 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 + +/* + * 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 <linux/compiler.h> +#include <asm/arch/memory.h> +#include <asm/sizes.h> + +#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 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 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 + +#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 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 <asm-generic/memory_model.h> + +#endif |