GuanXuetao | b50f170 | 2011-01-15 18:16:59 +0800 | [diff] [blame] | 1 | /* |
| 2 | * linux/arch/unicore32/include/asm/memory.h |
| 3 | * |
| 4 | * Code specific to PKUnity SoC and UniCore ISA |
| 5 | * |
| 6 | * Copyright (C) 2001-2010 GUAN Xue-tao |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License version 2 as |
| 10 | * published by the Free Software Foundation. |
| 11 | * |
| 12 | * Note: this file should not be included by non-asm/.h files |
| 13 | */ |
| 14 | #ifndef __UNICORE_MEMORY_H__ |
| 15 | #define __UNICORE_MEMORY_H__ |
| 16 | |
| 17 | #include <linux/compiler.h> |
| 18 | #include <linux/const.h> |
| 19 | #include <asm/sizes.h> |
| 20 | #include <mach/memory.h> |
| 21 | |
| 22 | /* |
| 23 | * Allow for constants defined here to be used from assembly code |
| 24 | * by prepending the UL suffix only with actual C code compilation. |
| 25 | */ |
| 26 | #define UL(x) _AC(x, UL) |
| 27 | |
| 28 | /* |
| 29 | * PAGE_OFFSET - the virtual address of the start of the kernel image |
| 30 | * TASK_SIZE - the maximum size of a user space task. |
| 31 | * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area |
| 32 | */ |
| 33 | #define PAGE_OFFSET UL(0xC0000000) |
| 34 | #define TASK_SIZE (PAGE_OFFSET - UL(0x41000000)) |
| 35 | #define TASK_UNMAPPED_BASE (PAGE_OFFSET / 3) |
| 36 | |
| 37 | /* |
| 38 | * The module space lives between the addresses given by TASK_SIZE |
| 39 | * and PAGE_OFFSET - it must be within 32MB of the kernel text. |
| 40 | */ |
| 41 | #define MODULES_VADDR (PAGE_OFFSET - 16*1024*1024) |
| 42 | #if TASK_SIZE > MODULES_VADDR |
| 43 | #error Top of user space clashes with start of module space |
| 44 | #endif |
| 45 | |
| 46 | #define MODULES_END (PAGE_OFFSET) |
| 47 | |
| 48 | /* |
| 49 | * Allow 16MB-aligned ioremap pages |
| 50 | */ |
| 51 | #define IOREMAP_MAX_ORDER 24 |
| 52 | |
| 53 | /* |
| 54 | * Physical vs virtual RAM address space conversion. These are |
| 55 | * private definitions which should NOT be used outside memory.h |
| 56 | * files. Use virt_to_phys/phys_to_virt/__pa/__va instead. |
| 57 | */ |
| 58 | #ifndef __virt_to_phys |
| 59 | #define __virt_to_phys(x) ((x) - PAGE_OFFSET + PHYS_OFFSET) |
| 60 | #define __phys_to_virt(x) ((x) - PHYS_OFFSET + PAGE_OFFSET) |
| 61 | #endif |
| 62 | |
| 63 | /* |
GuanXuetao | b50f170 | 2011-01-15 18:16:59 +0800 | [diff] [blame] | 64 | * Convert a page to/from a physical address |
| 65 | */ |
| 66 | #define page_to_phys(page) (__pfn_to_phys(page_to_pfn(page))) |
| 67 | #define phys_to_page(phys) (pfn_to_page(__phys_to_pfn(phys))) |
| 68 | |
| 69 | #ifndef __ASSEMBLY__ |
| 70 | |
| 71 | #ifndef arch_adjust_zones |
| 72 | #define arch_adjust_zones(size, holes) do { } while (0) |
| 73 | #endif |
| 74 | |
| 75 | /* |
| 76 | * PFNs are used to describe any physical page; this means |
| 77 | * PFN 0 == physical address 0. |
| 78 | * |
| 79 | * This is the PFN of the first RAM page in the kernel |
| 80 | * direct-mapped view. We assume this is the first page |
| 81 | * of RAM in the mem_map as well. |
| 82 | */ |
| 83 | #define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT) |
| 84 | |
| 85 | /* |
| 86 | * Drivers should NOT use these either. |
| 87 | */ |
| 88 | #define __pa(x) __virt_to_phys((unsigned long)(x)) |
| 89 | #define __va(x) ((void *)__phys_to_virt((unsigned long)(x))) |
| 90 | #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) |
| 91 | |
| 92 | /* |
| 93 | * Conversion between a struct page and a physical address. |
| 94 | * |
GuanXuetao | b50f170 | 2011-01-15 18:16:59 +0800 | [diff] [blame] | 95 | * page_to_pfn(page) convert a struct page * to a PFN number |
| 96 | * pfn_to_page(pfn) convert a _valid_ PFN number to struct page * |
| 97 | * |
| 98 | * virt_to_page(k) convert a _valid_ virtual address to struct page * |
| 99 | * virt_addr_valid(k) indicates whether a virtual address is valid |
| 100 | */ |
| 101 | #define ARCH_PFN_OFFSET PHYS_PFN_OFFSET |
| 102 | |
| 103 | #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT) |
| 104 | #define virt_addr_valid(kaddr) ((unsigned long)(kaddr) >= PAGE_OFFSET && \ |
| 105 | (unsigned long)(kaddr) < (unsigned long)high_memory) |
| 106 | |
| 107 | #endif |
| 108 | |
| 109 | #include <asm-generic/memory_model.h> |
| 110 | |
| 111 | #endif |