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186 lines
5.3 KiB
186 lines
5.3 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef __ASM_SH_PAGE_H |
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#define __ASM_SH_PAGE_H |
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/* |
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* Copyright (C) 1999 Niibe Yutaka |
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*/ |
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#include <linux/const.h> |
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/* PAGE_SHIFT determines the page size */ |
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#if defined(CONFIG_PAGE_SIZE_4KB) |
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# define PAGE_SHIFT 12 |
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#elif defined(CONFIG_PAGE_SIZE_8KB) |
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# define PAGE_SHIFT 13 |
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#elif defined(CONFIG_PAGE_SIZE_16KB) |
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# define PAGE_SHIFT 14 |
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#elif defined(CONFIG_PAGE_SIZE_64KB) |
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# define PAGE_SHIFT 16 |
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#else |
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# error "Bogus kernel page size?" |
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#endif |
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#define PAGE_SIZE (_AC(1, UL) << PAGE_SHIFT) |
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#define PAGE_MASK (~(PAGE_SIZE-1)) |
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#define PTE_MASK PAGE_MASK |
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#if defined(CONFIG_HUGETLB_PAGE_SIZE_64K) |
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#define HPAGE_SHIFT 16 |
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#elif defined(CONFIG_HUGETLB_PAGE_SIZE_256K) |
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#define HPAGE_SHIFT 18 |
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#elif defined(CONFIG_HUGETLB_PAGE_SIZE_1MB) |
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#define HPAGE_SHIFT 20 |
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#elif defined(CONFIG_HUGETLB_PAGE_SIZE_4MB) |
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#define HPAGE_SHIFT 22 |
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#elif defined(CONFIG_HUGETLB_PAGE_SIZE_64MB) |
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#define HPAGE_SHIFT 26 |
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#endif |
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#ifdef CONFIG_HUGETLB_PAGE |
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#define HPAGE_SIZE (1UL << HPAGE_SHIFT) |
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#define HPAGE_MASK (~(HPAGE_SIZE-1)) |
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#define HUGETLB_PAGE_ORDER (HPAGE_SHIFT-PAGE_SHIFT) |
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#endif |
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#ifndef __ASSEMBLY__ |
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#include <asm/uncached.h> |
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extern unsigned long shm_align_mask; |
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extern unsigned long max_low_pfn, min_low_pfn; |
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extern unsigned long memory_start, memory_end, memory_limit; |
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static inline unsigned long |
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pages_do_alias(unsigned long addr1, unsigned long addr2) |
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{ |
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return (addr1 ^ addr2) & shm_align_mask; |
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} |
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#define clear_page(page) memset((void *)(page), 0, PAGE_SIZE) |
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extern void copy_page(void *to, void *from); |
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#define copy_user_page(to, from, vaddr, pg) __copy_user(to, from, PAGE_SIZE) |
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struct page; |
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struct vm_area_struct; |
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extern void copy_user_highpage(struct page *to, struct page *from, |
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unsigned long vaddr, struct vm_area_struct *vma); |
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#define __HAVE_ARCH_COPY_USER_HIGHPAGE |
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extern void clear_user_highpage(struct page *page, unsigned long vaddr); |
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#define clear_user_highpage clear_user_highpage |
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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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#ifdef CONFIG_X2TLB |
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typedef struct { unsigned long pte_low, pte_high; } pte_t; |
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typedef struct { unsigned long long pgprot; } pgprot_t; |
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typedef struct { unsigned long long pgd; } pgd_t; |
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#define pte_val(x) \ |
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((x).pte_low | ((unsigned long long)(x).pte_high << 32)) |
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#define __pte(x) \ |
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({ pte_t __pte = {(x), ((unsigned long long)(x)) >> 32}; __pte; }) |
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#else |
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typedef struct { unsigned long pte_low; } pte_t; |
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typedef struct { unsigned long pgprot; } pgprot_t; |
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typedef struct { unsigned long pgd; } pgd_t; |
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#define pte_val(x) ((x).pte_low) |
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#define __pte(x) ((pte_t) { (x) } ) |
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#endif |
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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 __pgd(x) ((pgd_t) { (x) } ) |
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#define __pgprot(x) ((pgprot_t) { (x) } ) |
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typedef struct page *pgtable_t; |
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#define pte_pgprot(x) __pgprot(pte_val(x) & PTE_FLAGS_MASK) |
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#endif /* !__ASSEMBLY__ */ |
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/* |
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* __MEMORY_START and SIZE are the physical addresses and size of RAM. |
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*/ |
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#define __MEMORY_START CONFIG_MEMORY_START |
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#define __MEMORY_SIZE CONFIG_MEMORY_SIZE |
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/* |
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* PHYSICAL_OFFSET is the offset in physical memory where the base |
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* of the kernel is loaded. |
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*/ |
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#ifdef CONFIG_PHYSICAL_START |
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#define PHYSICAL_OFFSET (CONFIG_PHYSICAL_START - __MEMORY_START) |
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#else |
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#define PHYSICAL_OFFSET 0 |
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#endif |
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/* |
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* PAGE_OFFSET is the virtual address of the start of kernel address |
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* space. |
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*/ |
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#define PAGE_OFFSET CONFIG_PAGE_OFFSET |
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/* |
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* Virtual to physical RAM address translation. |
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* |
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* In 29 bit mode, the physical offset of RAM from address 0 is visible in |
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* the kernel virtual address space, and thus we don't have to take |
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* this into account when translating. However in 32 bit mode this offset |
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* is not visible (it is part of the PMB mapping) and so needs to be |
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* added or subtracted as required. |
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*/ |
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#ifdef CONFIG_PMB |
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#define ___pa(x) ((x)-PAGE_OFFSET+__MEMORY_START) |
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#define ___va(x) ((x)+PAGE_OFFSET-__MEMORY_START) |
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#else |
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#define ___pa(x) ((x)-PAGE_OFFSET) |
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#define ___va(x) ((x)+PAGE_OFFSET) |
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#endif |
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#ifndef __ASSEMBLY__ |
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#define __pa(x) ___pa((unsigned long)x) |
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#define __va(x) (void *)___va((unsigned long)x) |
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#endif /* !__ASSEMBLY__ */ |
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#ifdef CONFIG_UNCACHED_MAPPING |
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#if defined(CONFIG_29BIT) |
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#define UNCAC_ADDR(addr) P2SEGADDR(addr) |
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#define CAC_ADDR(addr) P1SEGADDR(addr) |
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#else |
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#define UNCAC_ADDR(addr) ((addr) - PAGE_OFFSET + uncached_start) |
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#define CAC_ADDR(addr) ((addr) - uncached_start + PAGE_OFFSET) |
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#endif |
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#else |
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#define UNCAC_ADDR(addr) ((addr)) |
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#define CAC_ADDR(addr) ((addr)) |
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#endif |
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#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) |
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#define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT) |
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/* |
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* PFN = physical frame number (ie PFN 0 == physical address 0) |
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* PFN_START is the PFN of the first page of RAM. By defining this we |
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* don't have struct page entries for the portion of address space |
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* between physical address 0 and the start of RAM. |
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*/ |
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#define PFN_START (__MEMORY_START >> PAGE_SHIFT) |
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#define ARCH_PFN_OFFSET (PFN_START) |
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#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT) |
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#ifdef CONFIG_FLATMEM |
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#define pfn_valid(pfn) ((pfn) >= min_low_pfn && (pfn) < max_low_pfn) |
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#endif |
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#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT) |
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#include <asm-generic/memory_model.h> |
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#include <asm-generic/getorder.h> |
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/* |
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* Some drivers need to perform DMA into kmalloc'ed buffers |
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* and so we have to increase the kmalloc minalign for this. |
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*/ |
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#define ARCH_DMA_MINALIGN L1_CACHE_BYTES |
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#endif /* __ASM_SH_PAGE_H */
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