149 lines
3.6 KiB
C
149 lines
3.6 KiB
C
/*
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* Definitions for page handling
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 1994 - 1999, 2003 by Ralf Baechle
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*/
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#ifndef __ASM_PAGE_H
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#define __ASM_PAGE_H
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#include <linux/config.h>
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#include <asm/break.h>
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#ifdef __KERNEL__
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/*
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* PAGE_SHIFT determines the page size
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*/
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#ifdef CONFIG_PAGE_SIZE_4KB
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#define PAGE_SHIFT 12
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#endif
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#ifdef CONFIG_PAGE_SIZE_16KB
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#define PAGE_SHIFT 14
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#endif
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#ifdef CONFIG_PAGE_SIZE_64KB
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#define PAGE_SHIFT 16
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#endif
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#define PAGE_SIZE (1L << PAGE_SHIFT)
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#define PAGE_MASK (~(PAGE_SIZE-1))
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#ifndef __ASSEMBLY__
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#include <asm/cacheflush.h>
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#define BUG() \
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do { \
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__asm__ __volatile__("break %0" : : "i" (BRK_BUG)); \
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} while (0)
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#define PAGE_BUG(page) do { BUG(); } while (0)
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extern void clear_page(void * page);
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extern void copy_page(void * to, void * from);
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extern unsigned long shm_align_mask;
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static inline unsigned long pages_do_alias(unsigned long addr1,
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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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static inline void clear_user_page(void *page, unsigned long vaddr)
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{
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unsigned long kaddr = (unsigned long) page;
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clear_page(page);
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if (pages_do_alias(kaddr, vaddr))
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flush_data_cache_page(kaddr);
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}
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static inline void copy_user_page(void * to, void * from, unsigned long vaddr)
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{
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unsigned long kto = (unsigned long) to;
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copy_page(to, from);
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if (pages_do_alias(kto, vaddr))
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flush_data_cache_page(kto);
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}
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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_64BIT_PHYS_ADDR
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#ifdef CONFIG_CPU_MIPS32
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typedef struct { unsigned long pte_low, pte_high; } pte_t;
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#define pte_val(x) ((x).pte_low | ((unsigned long long)(x).pte_high << 32))
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#else
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typedef struct { unsigned long long pte_low; } pte_t;
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#define pte_val(x) ((x).pte_low)
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#endif
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#else
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typedef struct { unsigned long pte_low; } pte_t;
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#define pte_val(x) ((x).pte_low)
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#endif
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typedef struct { unsigned long pmd; } pmd_t;
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typedef struct { unsigned long pgd; } pgd_t;
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typedef struct { unsigned long pgprot; } pgprot_t;
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#define pmd_val(x) ((x).pmd)
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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 ptep_buddy(x) ((pte_t *)((unsigned long)(x) ^ sizeof(pte_t)))
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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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/* Pure 2^n version of get_order */
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static __inline__ int get_order(unsigned long size)
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{
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int order;
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size = (size-1) >> (PAGE_SHIFT-1);
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order = -1;
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do {
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size >>= 1;
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order++;
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} while (size);
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return order;
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}
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#endif /* !__ASSEMBLY__ */
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/* to align the pointer to the (next) page boundary */
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#define PAGE_ALIGN(addr) (((addr) + PAGE_SIZE - 1) & PAGE_MASK)
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/*
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* This handles the memory map.
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* We handle pages at KSEG0 for kernels with 32 bit address space.
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*/
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#define PAGE_OFFSET 0x80000000UL
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#define UNCAC_BASE 0xa0000000UL
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#define __pa(x) ((unsigned long) (x) - PAGE_OFFSET)
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#define __va(x) ((void *)((unsigned long) (x) + PAGE_OFFSET))
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#define virt_to_page(kaddr) (mem_map + (__pa(kaddr) >> PAGE_SHIFT))
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#define VALID_PAGE(page) ((page - mem_map) < max_mapnr)
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#define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \
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VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
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#define UNCAC_ADDR(addr) ((addr) - PAGE_OFFSET + UNCAC_BASE)
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#define CAC_ADDR(addr) ((addr) - UNCAC_BASE + PAGE_OFFSET)
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/*
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* Memory above this physical address will be considered highmem.
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*/
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#define HIGHMEM_START 0x20000000UL
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#endif /* defined (__KERNEL__) */
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#endif /* __ASM_PAGE_H */
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