1 /* SPDX-License-Identifier: GPL-2.0 */ 2 // Copyright (C) 2005-2017 Andes Technology Corporation 3 4 #ifndef __ASM_NDS32_MEMORY_H 5 #define __ASM_NDS32_MEMORY_H 6 7 #include <linux/compiler.h> 8 #include <linux/sizes.h> 9 10 #ifndef __ASSEMBLY__ 11 #include <asm/page.h> 12 #endif 13 14 #ifndef PHYS_OFFSET 15 #define PHYS_OFFSET (0x0) 16 #endif 17 18 /* 19 * TASK_SIZE - the maximum size of a user space task. 20 * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area 21 */ 22 #define TASK_SIZE ((CONFIG_PAGE_OFFSET) - (SZ_32M)) 23 #define TASK_UNMAPPED_BASE ALIGN(TASK_SIZE / 3, SZ_32M) 24 #define PAGE_OFFSET (CONFIG_PAGE_OFFSET) 25 26 /* 27 * Physical vs virtual RAM address space conversion. These are 28 * private definitions which should NOT be used outside memory.h 29 * files. Use virt_to_phys/phys_to_virt/__pa/__va instead. 30 */ 31 #ifndef __virt_to_phys 32 #define __virt_to_phys(x) ((x) - PAGE_OFFSET + PHYS_OFFSET) 33 #define __phys_to_virt(x) ((x) - PHYS_OFFSET + PAGE_OFFSET) 34 #endif 35 36 /* 37 * The module space lives between the addresses given by TASK_SIZE 38 * and PAGE_OFFSET - it must be within 32MB of the kernel text. 39 */ 40 #define MODULES_END (PAGE_OFFSET) 41 #define MODULES_VADDR (MODULES_END - SZ_32M) 42 43 #if TASK_SIZE > MODULES_VADDR 44 #error Top of user space clashes with start of module space 45 #endif 46 47 #ifndef __ASSEMBLY__ 48 49 /* 50 * PFNs are used to describe any physical page; this means 51 * PFN 0 == physical address 0. 52 * 53 * This is the PFN of the first RAM page in the kernel 54 * direct-mapped view. We assume this is the first page 55 * of RAM in the mem_map as well. 56 */ 57 #define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT) 58 59 /* 60 * Drivers should NOT use these either. 61 */ 62 #define __pa(x) __virt_to_phys((unsigned long)(x)) 63 #define __va(x) ((void *)__phys_to_virt((unsigned long)(x))) 64 65 /* 66 * Conversion between a struct page and a physical address. 67 * 68 * Note: when converting an unknown physical address to a 69 * struct page, the resulting pointer must be validated 70 * using VALID_PAGE(). It must return an invalid struct page 71 * for any physical address not corresponding to a system 72 * RAM address. 73 * 74 * pfn_valid(pfn) indicates whether a PFN number is valid 75 * 76 * virt_to_page(k) convert a _valid_ virtual address to struct page * 77 * virt_addr_valid(k) indicates whether a virtual address is valid 78 */ 79 #define ARCH_PFN_OFFSET PHYS_PFN_OFFSET 80 #define pfn_valid(pfn) ((pfn) >= PHYS_PFN_OFFSET && (pfn) < (PHYS_PFN_OFFSET + max_mapnr)) 81 82 #define virt_to_page(kaddr) (pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)) 83 #define virt_addr_valid(kaddr) ((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory) 84 85 #define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT) 86 87 #endif 88 89 #include <asm-generic/memory_model.h> 90 91 #endif 92