pgalloc.h

来自「Linux Kernel 2.6.9 for OMAP1710」· C头文件 代码 · 共 64 行

/* 
 * Copyright (C) 2000, 2001, 2002 Jeff Dike ([e-mail])
 * Derived from include/asm-i386/pgalloc.h and include/asm-i386/pgtable.h
 * Licensed under the GPL
 */

#ifndef __UM_PGALLOC_H
#define __UM_PGALLOC_H

#include "linux/mm.h"
#include "asm/fixmap.h"

#define pmd_populate_kernel(mm, pmd, pte) \
		set_pmd(pmd, __pmd(_PAGE_TABLE + (unsigned long) __pa(pte)))

static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, 
				struct page *pte)
{
	set_pmd(pmd, __pmd(_PAGE_TABLE + page_to_phys(pte)));
}

extern pgd_t *pgd_alloc(struct mm_struct *);
extern void pgd_free(pgd_t *pgd);

extern pte_t *pte_alloc_one_kernel(struct mm_struct *, unsigned long);
extern struct page *pte_alloc_one(struct mm_struct *, unsigned long);

static inline void pte_free_kernel(pte_t *pte)
{
	free_page((unsigned long) pte);
}

static inline void pte_free(struct page *pte)
{
	__free_page(pte);
}

#define __pte_free_tlb(tlb,pte) tlb_remove_page((tlb),(pte))

/*
 * allocating and freeing a pmd is trivial: the 1-entry pmd is
 * inside the pgd, so has no extra memory associated with it.
 */

#define pmd_alloc_one(mm, addr)		({ BUG(); ((pmd_t *)2); })
#define pmd_free(x)			do { } while (0)
#define __pmd_free_tlb(tlb,x)		do { } while (0)
#define pgd_populate(mm, pmd, pte)	BUG()

#define check_pgt_cache()	do { } while (0)

#endif

/*
 * Overrides for Emacs so that we follow Linus's tabbing style.
 * Emacs will notice this stuff at the end of the file and automatically
 * adjust the settings for this buffer only.  This must remain at the end
 * of the file.
 * ---------------------------------------------------------------------------
 * Local variables:
 * c-file-style: "linux"
 * End:
 */