/*
* 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 ) 2008 , 2009 Cavium Networks , Inc .
*/
#ifndef __ASM_HUGETLB_H
#define __ASM_HUGETLB_H
#include <asm /page.h>
#define __HAVE_ARCH_HUGE_PTEP_GET_AND_CLEAR
static inline pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
unsigned long addr, pte_t *ptep,
unsigned long sz)
{
pte_t clear;
pte_t pte = *ptep;
pte_val(clear) = (unsigned long )invalid_pte_table;
set_pte_at(mm, addr, ptep, clear);
return pte;
}
#define __HAVE_ARCH_HUGE_PTEP_CLEAR_FLUSH
static inline pte_t huge_ptep_clear_flush(struct vm_area_struct *vma,
unsigned long addr, pte_t *ptep)
{
pte_t pte;
unsigned long sz = huge_page_size(hstate_vma(vma));
/*
* clear the huge pte entry firstly , so that the other smp threads will
* not get old pte entry after finishing flush_tlb_page and before
* setting new huge pte entry
*/
pte = huge_ptep_get_and_clear(vma->vm_mm, addr, ptep, sz);
flush_tlb_page(vma, addr);
return pte;
}
#define __HAVE_ARCH_HUGE_PTE_NONE
static inline int huge_pte_none(pte_t pte)
{
unsigned long val = pte_val(pte) & ~_PAGE_GLOBAL;
return !val || (val == (unsigned long )invalid_pte_table);
}
#define __HAVE_ARCH_HUGE_PTEP_SET_ACCESS_FLAGS
static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma,
unsigned long addr,
pte_t *ptep, pte_t pte,
int dirty)
{
int changed = !pte_same(*ptep, pte);
if (changed) {
set_pte_at(vma->vm_mm, addr, ptep, pte);
/*
* There could be some standard sized pages in there ,
* get them all .
*/
flush_tlb_range(vma, addr, addr + HPAGE_SIZE);
}
return changed;
}
#include <asm -generic/hugetlb.h>
#endif /* __ASM_HUGETLB_H */
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