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97 lines
2.8 KiB
97 lines
2.8 KiB
/* 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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/* |
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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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