page-nommu.h

来自「linux 内核源代码」· C头文件 代码 · 共 52 行

/*
 *  linux/include/asm-arm/page-nommu.h
 *
 *  Copyright (C) 2004 Hyok S. Choi
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#ifndef _ASMARM_PAGE_NOMMU_H
#define _ASMARM_PAGE_NOMMU_H

#if !defined(CONFIG_SMALL_TASKS) && PAGE_SHIFT < 13
#define KTHREAD_SIZE (8192)
#else
#define KTHREAD_SIZE PAGE_SIZE
#endif
 
#define get_user_page(vaddr)		__get_free_page(GFP_KERNEL)
#define free_user_page(page, addr)	free_page(addr)

#define clear_page(page)	memset((page), 0, PAGE_SIZE)
#define copy_page(to,from)	memcpy((to), (from), PAGE_SIZE)

#define clear_user_page(page, vaddr, pg)	clear_page(page)
#define copy_user_page(to, from, vaddr, pg)	copy_page(to, from)

/*
 * These are used to make use of C type-checking..
 */
typedef unsigned long pte_t;
typedef unsigned long pmd_t;
typedef unsigned long pgd_t[2];
typedef unsigned long pgprot_t;

#define pte_val(x)      (x)
#define pmd_val(x)      (x)
#define pgd_val(x)	((x)[0])
#define pgprot_val(x)   (x)

#define __pte(x)        (x)
#define __pmd(x)        (x)
#define __pgprot(x)     (x)

/* to align the pointer to the (next) page boundary */
#define PAGE_ALIGN(addr)	(((addr)+PAGE_SIZE-1)&PAGE_MASK)

extern unsigned long memory_start;
extern unsigned long memory_end;

#endif