/* SPDX-License-Identifier: GPL-2.0 */ // Copyright (C) 2005-2017 Andes Technology Corporation #ifndef __ASM_NDS32_MEMORY_H #define __ASM_NDS32_MEMORY_H #include <linux/compiler.h> #include <linux/sizes.h> #ifndef __ASSEMBLY__ #include <asm/page.h> #endif #ifndef PHYS_OFFSET #define PHYS_OFFSET (0x0) #endif /* * TASK_SIZE - the maximum size of a user space task. * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area */ #define TASK_SIZE (([31mCONFIG_PAGE_OFFSET[0m) - (SZ_32M)) #define TASK_UNMAPPED_BASE ALIGN(TASK_SIZE / 3, SZ_32M) #define PAGE_OFFSET ([31mCONFIG_PAGE_OFFSET[0m) /* * Physical vs virtual RAM address space conversion. These are * private definitions which should NOT be used outside memory.h * files. Use virt_to_phys/phys_to_virt/__pa/__va instead. */ #ifndef __virt_to_phys #define __virt_to_phys(x) ((x) - PAGE_OFFSET + PHYS_OFFSET) #define __phys_to_virt(x) ((x) - PHYS_OFFSET + PAGE_OFFSET) #endif /* * The module space lives between the addresses given by TASK_SIZE * and PAGE_OFFSET - it must be within 32MB of the kernel text. */ #define MODULES_END (PAGE_OFFSET) #define MODULES_VADDR (MODULES_END - SZ_32M) #if TASK_SIZE > MODULES_VADDR #error Top of user space clashes with start of module space #endif #ifndef __ASSEMBLY__ /* * PFNs are used to describe any physical page; this means * PFN 0 == physical address 0. * * This is the PFN of the first RAM page in the kernel * direct-mapped view. We assume this is the first page * of RAM in the mem_map as well. */ #define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT) /* * Drivers should NOT use these either. */ #define __pa(x) __virt_to_phys((unsigned long)(x)) #define __va(x) ((void *)__phys_to_virt((unsigned long)(x))) /* * Conversion between a struct page and a physical address. * * Note: when converting an unknown physical address to a * struct page, the resulting pointer must be validated * using VALID_PAGE(). It must return an invalid struct page * for any physical address not corresponding to a system * RAM address. * * pfn_valid(pfn) indicates whether a PFN number is valid * * virt_to_page(k) convert a _valid_ virtual address to struct page * * virt_addr_valid(k) indicates whether a virtual address is valid */ #ifndef [31mCONFIG_DISCONTIGMEM[0m #define ARCH_PFN_OFFSET PHYS_PFN_OFFSET #define pfn_valid(pfn) ((pfn) >= PHYS_PFN_OFFSET && (pfn) < (PHYS_PFN_OFFSET + max_mapnr)) #define virt_to_page(kaddr) (pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)) #define virt_addr_valid(kaddr) ((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory) #else /* CONFIG_DISCONTIGMEM */ #error [31mCONFIG_DISCONTIGMEM[0m is not supported yet. #endif /* !CONFIG_DISCONTIGMEM */ #define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT) #endif #include <asm-generic/memory_model.h> #endif |