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 * PAGE_OFFSET - the virtual address of the start of the kernel image 24 * TASK_SIZE - the maximum size of a user space task. 25 * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area 26 */ 27#define PAGE_OFFSET UL(0xC0000000) 28#define TASK_SIZE (PAGE_OFFSET - UL(0x41000000)) 29#define TASK_UNMAPPED_BASE (PAGE_OFFSET / 3) 30 31/* 32 * The module space lives between the addresses given by TASK_SIZE 33 * and PAGE_OFFSET - it must be within 32MB of the kernel text. 34 */ 35#define MODULES_VADDR (PAGE_OFFSET - 16*1024*1024) 36#if TASK_SIZE > MODULES_VADDR 37#error Top of user space clashes with start of module space 38#endif 39 40#define MODULES_END (PAGE_OFFSET) 41 42/* 43 * Allow 16MB-aligned ioremap pages 44 */ 45#define IOREMAP_MAX_ORDER 24 46 47/* 48 * Physical vs virtual RAM address space conversion. These are 49 * private definitions which should NOT be used outside memory.h 50 * files. Use virt_to_phys/phys_to_virt/__pa/__va instead. 51 */ 52#ifndef __virt_to_phys 53#define __virt_to_phys(x) ((x) - PAGE_OFFSET + PHYS_OFFSET) 54#define __phys_to_virt(x) ((x) - PHYS_OFFSET + PAGE_OFFSET) 55#endif 56 57/* 58 * Convert a page to/from a physical address 59 */ 60#define page_to_phys(page) (__pfn_to_phys(page_to_pfn(page))) 61#define phys_to_page(phys) (pfn_to_page(__phys_to_pfn(phys))) 62 63#ifndef __ASSEMBLY__ 64 65#ifndef arch_adjust_zones 66#define arch_adjust_zones(size, holes) do { } while (0) 67#endif 68 69/* 70 * PFNs are used to describe any physical page; this means 71 * PFN 0 == physical address 0. 72 * 73 * This is the PFN of the first RAM page in the kernel 74 * direct-mapped view. We assume this is the first page 75 * of RAM in the mem_map as well. 76 */ 77#define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT) 78 79/* 80 * Drivers should NOT use these either. 81 */ 82#define __pa(x) __virt_to_phys((unsigned long)(x)) 83#define __va(x) ((void *)__phys_to_virt((unsigned long)(x))) 84#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) 85 86/* 87 * Conversion between a struct page and a physical address. 88 * 89 * page_to_pfn(page) convert a struct page * to a PFN number 90 * pfn_to_page(pfn) convert a _valid_ PFN number to struct page * 91 * 92 * virt_to_page(k) convert a _valid_ virtual address to struct page * 93 * virt_addr_valid(k) indicates whether a virtual address is valid 94 */ 95#define ARCH_PFN_OFFSET PHYS_PFN_OFFSET 96 97#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT) 98#define virt_addr_valid(kaddr) ((unsigned long)(kaddr) >= PAGE_OFFSET && \ 99 (unsigned long)(kaddr) < (unsigned long)high_memory) 100 101#endif 102 103#include <asm-generic/memory_model.h> 104 105#endif 106