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/* 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 ((CONFIG_PAGE_OFFSET) - (SZ_32M))
#define TASK_UNMAPPED_BASE ALIGN(TASK_SIZE / 3, SZ_32M)
#define PAGE_OFFSET (CONFIG_PAGE_OFFSET)
/*
* 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 CONFIG_DISCONTIGMEM
#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 CONFIG_DISCONTIGMEM 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
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