projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | /* |
| 2 | * linux/include/asm-arm26/memory.h | |
| 3 | * | |
| 4 | * Copyright (C) 2000-2002 Russell King | |
| 5 | * | |
| 6 | * This program is free software; you can redistribute it and/or modify | |
| 7 | * it under the terms of the GNU General Public License version 2 as | |
| 8 | * published by the Free Software Foundation. | |
| 9 | * | |
| 10 | * Note: this file should not be included by non-asm/.h files | |
| 11 | */ | |
| 12 | #ifndef __ASM_ARM_MEMORY_H | |
| 13 | #define __ASM_ARM_MEMORY_H | |
| 14 | ||
| 15 | /* | |
| 16 | * User space: 26MB | |
| 17 | */ | |
| 18 | #define TASK_SIZE (0x01a00000UL) | |
| 19 | ||
| 20 | /* | |
| 21 | * This decides where the kernel will search for a free chunk of vm | |
| 22 | * space during mmap's. | |
| 23 | */ | |
| 24 | #define TASK_UNMAPPED_BASE (TASK_SIZE / 3) | |
| 25 | ||
| 26 | /* | |
| 27 | * Page offset: 32MB | |
| 28 | */ | |
| 29 | #define PAGE_OFFSET (0x02000000UL) | |
| 30 | #define PHYS_OFFSET (0x02000000UL) | |
| 31 | ||
| 32 | #define PHYS_TO_NID(addr) (0) | |
| 33 | ||
| 34 | /* | |
| 35 | * PFNs are used to describe any physical page; this means | |
| 36 | * PFN 0 == physical address 0. | |
| 37 | * | |
| 38 | * This is the PFN of the first RAM page in the kernel | |
| 39 | * direct-mapped view. We assume this is the first page | |
| 40 | * of RAM in the mem_map as well. | |
| 41 | */ | |
| 42 | #define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT) | |
| 43 | ||
| 44 | /* | |
| 45 | * These are *only* valid on the kernel direct mapped RAM memory. | |
| 46 | */ | |
| 47 | static inline unsigned long virt_to_phys(void *x) | |
| 48 | { | |
| 49 | return (unsigned long)x; | |
| 50 | } | |
| 51 | ||
| 52 | static inline void *phys_to_virt(unsigned long x) | |
| 53 | { | |
| 54 | return (void *)((unsigned long)x); | |
| 55 | } | |
| 56 | ||
| 57 | #define __pa(x) (unsigned long)(x) | |
| 58 | #define __va(x) ((void *)(unsigned long)(x)) | |
| 59 | ||
| 60 | /* | |
| 61 | * Virtual <-> DMA view memory address translations | |
| 62 | * Again, these are *only* valid on the kernel direct mapped RAM | |
| 63 | * memory. Use of these is *depreciated*. | |
| 64 | */ | |
| 65 | #define virt_to_bus(x) ((unsigned long)(x)) | |
| 66 | #define bus_to_virt(x) ((void *)((unsigned long)(x))) | |
| 67 | ||
| 68 | /* | |
| 69 | * Conversion between a struct page and a physical address. | |
| 70 | * | |
| 71 | * Note: when converting an unknown physical address to a | |
| 72 | * struct page, the resulting pointer must be validated | |
| 73 | * using VALID_PAGE(). It must return an invalid struct page | |
| 74 | * for any physical address not corresponding to a system | |
| 75 | * RAM address. | |
| 76 | * | |
| 77 | * page_to_pfn(page) convert a struct page * to a PFN number | |
| 78 | * pfn_to_page(pfn) convert a _valid_ PFN number to struct page * | |
| 79 | * pfn_valid(pfn) indicates whether a PFN number is valid | |
| 80 | * | |
| 81 | * virt_to_page(k) convert a _valid_ virtual address to struct page * | |
| 82 | * virt_addr_valid(k) indicates whether a virtual address is valid | |
| 83 | */ | |
| 84 | #define page_to_pfn(page) (((page) - mem_map) + PHYS_PFN_OFFSET) | |
| 85 | #define pfn_to_page(pfn) ((mem_map + (pfn)) - PHYS_PFN_OFFSET) | |
| 86 | #define pfn_valid(pfn) ((pfn) >= PHYS_PFN_OFFSET && (pfn) < (PHYS_PFN_OFFSET + max_mapnr)) | |
| 87 | ||
| 88 | #define virt_to_page(kaddr) (pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)) | |
| 89 | #define virt_addr_valid(kaddr) ((int)(kaddr) >= PAGE_OFFSET && (int)(kaddr) < (unsigned long)high_memory) | |
| 90 | ||
| 91 | /* | |
| 92 | * For BIO. "will die". Kill me when bio_to_phys() and bvec_to_phys() die. | |
| 93 | */ | |
| 94 | #define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT) | |
| 95 | ||
| 96 | /* | |
| 97 | * We should really eliminate virt_to_bus() here - it's depreciated. | |
| 98 | */ | |
| 99 | #define page_to_bus(page) (page_address(page)) | |
| 100 | ||
| 101 | #endif |