1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * linux/arch/unicore32/include/asm/memory.h 4 * 5 * Code specific to PKUnity SoC and UniCore ISA 6 * 7 * Copyright (C) 2001-2010 GUAN Xue-tao 8 * 9 * Note: this file should not be included by non-asm/.h files 10 */ 11 #ifndef __UNICORE_MEMORY_H__ 12 #define __UNICORE_MEMORY_H__ 13 14 #include <linux/compiler.h> 15 #include <linux/const.h> 16 #include <linux/sizes.h> 17 #include <mach/memory.h> 18 19 /* 20 * PAGE_OFFSET - the virtual address of the start of the kernel image 21 * TASK_SIZE - the maximum size of a user space task. 22 * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area 23 */ 24 #define PAGE_OFFSET UL(0xC0000000) 25 #define TASK_SIZE (PAGE_OFFSET - UL(0x41000000)) 26 #define TASK_UNMAPPED_BASE (PAGE_OFFSET / 3) 27 28 /* 29 * The module space lives between the addresses given by TASK_SIZE 30 * and PAGE_OFFSET - it must be within 32MB of the kernel text. 31 */ 32 #define MODULES_VADDR (PAGE_OFFSET - 16*1024*1024) 33 #if TASK_SIZE > MODULES_VADDR 34 #error Top of user space clashes with start of module space 35 #endif 36 37 #define MODULES_END (PAGE_OFFSET) 38 39 /* 40 * Allow 16MB-aligned ioremap pages 41 */ 42 #define IOREMAP_MAX_ORDER 24 43 44 /* 45 * Physical vs virtual RAM address space conversion. These are 46 * private definitions which should NOT be used outside memory.h 47 * files. Use virt_to_phys/phys_to_virt/__pa/__va instead. 48 */ 49 #ifndef __virt_to_phys 50 #define __virt_to_phys(x) ((x) - PAGE_OFFSET + PHYS_OFFSET) 51 #define __phys_to_virt(x) ((x) - PHYS_OFFSET + PAGE_OFFSET) 52 #endif 53 54 /* 55 * Convert a page to/from a physical address 56 */ 57 #define page_to_phys(page) (__pfn_to_phys(page_to_pfn(page))) 58 #define phys_to_page(phys) (pfn_to_page(__phys_to_pfn(phys))) 59 60 #ifndef __ASSEMBLY__ 61 62 #ifndef arch_adjust_zones 63 #define arch_adjust_zones(size, holes) do { } while (0) 64 #endif 65 66 /* 67 * PFNs are used to describe any physical page; this means 68 * PFN 0 == physical address 0. 69 * 70 * This is the PFN of the first RAM page in the kernel 71 * direct-mapped view. We assume this is the first page 72 * of RAM in the mem_map as well. 73 */ 74 #define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT) 75 76 /* 77 * Drivers should NOT use these either. 78 */ 79 #define __pa(x) __virt_to_phys((unsigned long)(x)) 80 #define __va(x) ((void *)__phys_to_virt((unsigned long)(x))) 81 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) 82 83 /* 84 * Conversion between a struct page and a physical address. 85 * 86 * page_to_pfn(page) convert a struct page * to a PFN number 87 * pfn_to_page(pfn) convert a _valid_ PFN number to struct page * 88 * 89 * virt_to_page(k) convert a _valid_ virtual address to struct page * 90 * virt_addr_valid(k) indicates whether a virtual address is valid 91 */ 92 #define ARCH_PFN_OFFSET PHYS_PFN_OFFSET 93 94 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT) 95 #define virt_addr_valid(kaddr) ((unsigned long)(kaddr) >= PAGE_OFFSET && \ 96 (unsigned long)(kaddr) < (unsigned long)high_memory) 97 98 #endif 99 100 #include <asm-generic/memory_model.h> 101 102 #endif 103