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/* $Id: page.h,v 1.9 2000/02/24 00:13:19 ralf Exp $ * * 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 - 1999 by Ralf Baechle */ #ifndef __ASM_PAGE_H #define __ASM_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__ #ifndef _LANGUAGE_ASSEMBLY #define BUG() do { printk("kernel BUG at %s:%d!\n", __FILE__, __LINE__); *(int *)0=0; } while (0) #define PAGE_BUG(page) do { BUG(); } while (0) extern void (*_clear_page)(void * page); extern void (*_copy_page)(void * to, void * from); #define clear_page(page) _clear_page(page) #define copy_page(to, from) _copy_page(to, from) #define clear_user_page(page, vaddr) clear_page(page) #define copy_user_page(to, from, vaddr) copy_page(to, from) /* * 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) } ) /* Pure 2^n version of get_order */ extern __inline__ int get_order(unsigned long size) { int order; size = (size-1) >> (PAGE_SHIFT-1); order = -1; do { size >>= 1; order++; } while (size); return order; } #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 virt_to_page(kaddr) (mem_map + (__pa(kaddr) >> PAGE_SHIFT)) #define VALID_PAGE(page) ((page - mem_map) < max_mapnr) #endif /* defined (__KERNEL__) */ #endif /* __ASM_PAGE_H */ |