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