1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 */ 2*4882a593Smuzhiyun // Copyright (C) 2005-2017 Andes Technology Corporation 3*4882a593Smuzhiyun 4*4882a593Smuzhiyun #ifndef __ASM_NDS32_MEMORY_H 5*4882a593Smuzhiyun #define __ASM_NDS32_MEMORY_H 6*4882a593Smuzhiyun 7*4882a593Smuzhiyun #include <linux/compiler.h> 8*4882a593Smuzhiyun #include <linux/sizes.h> 9*4882a593Smuzhiyun 10*4882a593Smuzhiyun #ifndef __ASSEMBLY__ 11*4882a593Smuzhiyun #include <asm/page.h> 12*4882a593Smuzhiyun #endif 13*4882a593Smuzhiyun 14*4882a593Smuzhiyun #ifndef PHYS_OFFSET 15*4882a593Smuzhiyun #define PHYS_OFFSET (0x0) 16*4882a593Smuzhiyun #endif 17*4882a593Smuzhiyun 18*4882a593Smuzhiyun /* 19*4882a593Smuzhiyun * TASK_SIZE - the maximum size of a user space task. 20*4882a593Smuzhiyun * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area 21*4882a593Smuzhiyun */ 22*4882a593Smuzhiyun #define TASK_SIZE ((CONFIG_PAGE_OFFSET) - (SZ_32M)) 23*4882a593Smuzhiyun #define TASK_UNMAPPED_BASE ALIGN(TASK_SIZE / 3, SZ_32M) 24*4882a593Smuzhiyun #define PAGE_OFFSET (CONFIG_PAGE_OFFSET) 25*4882a593Smuzhiyun 26*4882a593Smuzhiyun /* 27*4882a593Smuzhiyun * Physical vs virtual RAM address space conversion. These are 28*4882a593Smuzhiyun * private definitions which should NOT be used outside memory.h 29*4882a593Smuzhiyun * files. Use virt_to_phys/phys_to_virt/__pa/__va instead. 30*4882a593Smuzhiyun */ 31*4882a593Smuzhiyun #ifndef __virt_to_phys 32*4882a593Smuzhiyun #define __virt_to_phys(x) ((x) - PAGE_OFFSET + PHYS_OFFSET) 33*4882a593Smuzhiyun #define __phys_to_virt(x) ((x) - PHYS_OFFSET + PAGE_OFFSET) 34*4882a593Smuzhiyun #endif 35*4882a593Smuzhiyun 36*4882a593Smuzhiyun /* 37*4882a593Smuzhiyun * The module space lives between the addresses given by TASK_SIZE 38*4882a593Smuzhiyun * and PAGE_OFFSET - it must be within 32MB of the kernel text. 39*4882a593Smuzhiyun */ 40*4882a593Smuzhiyun #define MODULES_END (PAGE_OFFSET) 41*4882a593Smuzhiyun #define MODULES_VADDR (MODULES_END - SZ_32M) 42*4882a593Smuzhiyun 43*4882a593Smuzhiyun #if TASK_SIZE > MODULES_VADDR 44*4882a593Smuzhiyun #error Top of user space clashes with start of module space 45*4882a593Smuzhiyun #endif 46*4882a593Smuzhiyun 47*4882a593Smuzhiyun #ifndef __ASSEMBLY__ 48*4882a593Smuzhiyun 49*4882a593Smuzhiyun /* 50*4882a593Smuzhiyun * PFNs are used to describe any physical page; this means 51*4882a593Smuzhiyun * PFN 0 == physical address 0. 52*4882a593Smuzhiyun * 53*4882a593Smuzhiyun * This is the PFN of the first RAM page in the kernel 54*4882a593Smuzhiyun * direct-mapped view. We assume this is the first page 55*4882a593Smuzhiyun * of RAM in the mem_map as well. 56*4882a593Smuzhiyun */ 57*4882a593Smuzhiyun #define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT) 58*4882a593Smuzhiyun 59*4882a593Smuzhiyun /* 60*4882a593Smuzhiyun * Drivers should NOT use these either. 61*4882a593Smuzhiyun */ 62*4882a593Smuzhiyun #define __pa(x) __virt_to_phys((unsigned long)(x)) 63*4882a593Smuzhiyun #define __va(x) ((void *)__phys_to_virt((unsigned long)(x))) 64*4882a593Smuzhiyun 65*4882a593Smuzhiyun /* 66*4882a593Smuzhiyun * Conversion between a struct page and a physical address. 67*4882a593Smuzhiyun * 68*4882a593Smuzhiyun * Note: when converting an unknown physical address to a 69*4882a593Smuzhiyun * struct page, the resulting pointer must be validated 70*4882a593Smuzhiyun * using VALID_PAGE(). It must return an invalid struct page 71*4882a593Smuzhiyun * for any physical address not corresponding to a system 72*4882a593Smuzhiyun * RAM address. 73*4882a593Smuzhiyun * 74*4882a593Smuzhiyun * pfn_valid(pfn) indicates whether a PFN number is valid 75*4882a593Smuzhiyun * 76*4882a593Smuzhiyun * virt_to_page(k) convert a _valid_ virtual address to struct page * 77*4882a593Smuzhiyun * virt_addr_valid(k) indicates whether a virtual address is valid 78*4882a593Smuzhiyun */ 79*4882a593Smuzhiyun #ifndef CONFIG_DISCONTIGMEM 80*4882a593Smuzhiyun 81*4882a593Smuzhiyun #define ARCH_PFN_OFFSET PHYS_PFN_OFFSET 82*4882a593Smuzhiyun #define pfn_valid(pfn) ((pfn) >= PHYS_PFN_OFFSET && (pfn) < (PHYS_PFN_OFFSET + max_mapnr)) 83*4882a593Smuzhiyun 84*4882a593Smuzhiyun #define virt_to_page(kaddr) (pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)) 85*4882a593Smuzhiyun #define virt_addr_valid(kaddr) ((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory) 86*4882a593Smuzhiyun 87*4882a593Smuzhiyun #else /* CONFIG_DISCONTIGMEM */ 88*4882a593Smuzhiyun #error CONFIG_DISCONTIGMEM is not supported yet. 89*4882a593Smuzhiyun #endif /* !CONFIG_DISCONTIGMEM */ 90*4882a593Smuzhiyun 91*4882a593Smuzhiyun #define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT) 92*4882a593Smuzhiyun 93*4882a593Smuzhiyun #endif 94*4882a593Smuzhiyun 95*4882a593Smuzhiyun #include <asm-generic/memory_model.h> 96*4882a593Smuzhiyun 97*4882a593Smuzhiyun #endif 98