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/* * Definitions for page handling * * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive * for more details. * * Copyright (C) 1994, 1995, 1996 by Ralf Baechle */ #ifndef __ASM_MIPS_PAGE_H #define __ASM_MIPS_PAGE_H /* PAGE_SHIFT determines the page size */ #define PAGE_SHIFT 12 #define PAGE_SIZE (1UL << PAGE_SHIFT) #define PAGE_MASK (~(PAGE_SIZE-1)) #ifdef __KERNEL__ #define STRICT_MM_TYPECHECKS #ifndef __LANGUAGE_ASSEMBLY__ extern void (*clear_page)(unsigned long page); extern void (*copy_page)(unsigned long to, unsigned long from); #ifdef STRICT_MM_TYPECHECKS /* * These are used to make use of C type-checking.. */ typedef struct { unsigned long pte; } pte_t; typedef struct { unsigned long pmd; } pmd_t; typedef struct { unsigned long pgd; } pgd_t; typedef struct { unsigned long pgprot; } pgprot_t; #define pte_val(x) ((x).pte) #define pmd_val(x) ((x).pmd) #define pgd_val(x) ((x).pgd) #define pgprot_val(x) ((x).pgprot) #define __pte(x) ((pte_t) { (x) } ) #define __pme(x) ((pme_t) { (x) } ) #define __pgd(x) ((pgd_t) { (x) } ) #define __pgprot(x) ((pgprot_t) { (x) } ) #else /* !defined (STRICT_MM_TYPECHECKS) */ /* * .. while these make it easier on the compiler */ typedef unsigned long pte_t; typedef unsigned long pmd_t; typedef unsigned long pgd_t; typedef unsigned long pgprot_t; #define pte_val(x) (x) #define pmd_val(x) (x) #define pgd_val(x) (x) #define pgprot_val(x) (x) #define __pte(x) (x) #define __pmd(x) (x) #define __pgd(x) (x) #define __pgprot(x) (x) #endif /* !defined (STRICT_MM_TYPECHECKS) */ #endif /* __LANGUAGE_ASSEMBLY__ */ /* to align the pointer to the (next) page boundary */ #define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE-1)&PAGE_MASK) /* * This handles the memory map. * We handle pages at KSEG0 for kernels with 32 bit address space. */ #define PAGE_OFFSET 0x80000000UL #define __pa(x) ((unsigned long) (x) - PAGE_OFFSET) #define __va(x) ((void *)((unsigned long) (x) + PAGE_OFFSET)) #define MAP_MASK 0x1fffffffUL #define MAP_NR(addr) ((((unsigned long)(addr)) & MAP_MASK) >> PAGE_SHIFT) #endif /* defined (__KERNEL__) */ #endif /* __ASM_MIPS_PAGE_H */ |