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97 lines
2.3 KiB
97 lines
2.3 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef __ASM_GENERIC_PAGE_H |
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#define __ASM_GENERIC_PAGE_H |
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/* |
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* Generic page.h implementation, for NOMMU architectures. |
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* This provides the dummy definitions for the memory management. |
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*/ |
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#ifdef CONFIG_MMU |
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#error need to provide a real asm/page.h |
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#endif |
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/* PAGE_SHIFT determines the page size */ |
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#define PAGE_SHIFT 12 |
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#ifdef __ASSEMBLY__ |
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#define PAGE_SIZE (1 << PAGE_SHIFT) |
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#else |
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#define PAGE_SIZE (1UL << PAGE_SHIFT) |
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#endif |
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#define PAGE_MASK (~(PAGE_SIZE-1)) |
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#include <asm/setup.h> |
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#ifndef __ASSEMBLY__ |
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#define clear_page(page) memset((page), 0, PAGE_SIZE) |
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#define copy_page(to,from) memcpy((to), (from), PAGE_SIZE) |
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#define clear_user_page(page, vaddr, pg) clear_page(page) |
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#define copy_user_page(to, from, vaddr, pg) copy_page(to, from) |
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/* |
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* These are used to make use of C type-checking.. |
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*/ |
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typedef struct { |
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unsigned long pte; |
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} pte_t; |
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typedef struct { |
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unsigned long pmd[16]; |
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} pmd_t; |
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typedef struct { |
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unsigned long pgd; |
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} pgd_t; |
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typedef struct { |
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unsigned long pgprot; |
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} pgprot_t; |
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typedef struct page *pgtable_t; |
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#define pte_val(x) ((x).pte) |
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#define pmd_val(x) ((&x)->pmd[0]) |
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#define pgd_val(x) ((x).pgd) |
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#define pgprot_val(x) ((x).pgprot) |
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#define __pte(x) ((pte_t) { (x) } ) |
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#define __pmd(x) ((pmd_t) { (x) } ) |
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#define __pgd(x) ((pgd_t) { (x) } ) |
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#define __pgprot(x) ((pgprot_t) { (x) } ) |
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extern unsigned long memory_start; |
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extern unsigned long memory_end; |
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#endif /* !__ASSEMBLY__ */ |
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#define PAGE_OFFSET (0) |
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#ifndef ARCH_PFN_OFFSET |
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#define ARCH_PFN_OFFSET (PAGE_OFFSET >> PAGE_SHIFT) |
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#endif |
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#ifndef __ASSEMBLY__ |
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#define __va(x) ((void *)((unsigned long) (x))) |
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#define __pa(x) ((unsigned long) (x)) |
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#define virt_to_pfn(kaddr) (__pa(kaddr) >> PAGE_SHIFT) |
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#define pfn_to_virt(pfn) __va((pfn) << PAGE_SHIFT) |
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#define virt_to_page(addr) pfn_to_page(virt_to_pfn(addr)) |
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#define page_to_virt(page) pfn_to_virt(page_to_pfn(page)) |
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#ifndef page_to_phys |
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#define page_to_phys(page) ((dma_addr_t)page_to_pfn(page) << PAGE_SHIFT) |
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#endif |
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#define pfn_valid(pfn) ((pfn) >= ARCH_PFN_OFFSET && ((pfn) - ARCH_PFN_OFFSET) < max_mapnr) |
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#define virt_addr_valid(kaddr) (((void *)(kaddr) >= (void *)PAGE_OFFSET) && \ |
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((void *)(kaddr) < (void *)memory_end)) |
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#endif /* __ASSEMBLY__ */ |
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#include <asm-generic/memory_model.h> |
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#include <asm-generic/getorder.h> |
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#endif /* __ASM_GENERIC_PAGE_H */
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