[deliverable/linux.git] / arch / s390 / include / asm / hugetlb.h

/*
 *  IBM System z Huge TLB Page Support for Kernel.
 *
 *    Copyright IBM Corp. 2008
 *    Author(s): Gerald Schaefer <gerald.schaefer@de.ibm.com>
 */

#ifndef _ASM_S390_HUGETLB_H
#define _ASM_S390_HUGETLB_H

#include <asm/page.h>
#include <asm/pgtable.h>


#define is_hugepage_only_range(mm, addr, len)	0
#define hugetlb_free_pgd_range			free_pgd_range

void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
		     pte_t *ptep, pte_t pte);
pte_t huge_ptep_get(pte_t *ptep);
pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
			      unsigned long addr, pte_t *ptep);

/*
 * If the arch doesn't supply something else, assume that hugepage
 * size aligned regions are ok without further preparation.
 */
static inline int prepare_hugepage_range(struct file *file,
			unsigned long addr, unsigned long len)
{
	if (len & ~HPAGE_MASK)
		return -EINVAL;
	if (addr & ~HPAGE_MASK)
		return -EINVAL;
	return 0;
}

#define arch_clear_hugepage_flags(page)		do { } while (0)

static inline void huge_pte_clear(struct mm_struct *mm, unsigned long addr,
				  pte_t *ptep)
{
	pte_val(*ptep) = _SEGMENT_ENTRY_EMPTY;
}

static inline void huge_ptep_clear_flush(struct vm_area_struct *vma,
					 unsigned long address, pte_t *ptep)
{
	huge_ptep_get_and_clear(vma->vm_mm, address, ptep);
}

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(huge_ptep_get(ptep), pte);
	if (changed) {
		huge_ptep_get_and_clear(vma->vm_mm, addr, ptep);
		set_huge_pte_at(vma->vm_mm, addr, ptep, pte);
	}
	return changed;
}

static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
					   unsigned long addr, pte_t *ptep)
{
	pte_t pte = huge_ptep_get_and_clear(mm, addr, ptep);
	set_huge_pte_at(mm, addr, ptep, pte_wrprotect(pte));
}

static inline pte_t mk_huge_pte(struct page *page, pgprot_t pgprot)
{
	return mk_pte(page, pgprot);
}

static inline int huge_pte_none(pte_t pte)
{
	return pte_none(pte);
}

static inline int huge_pte_write(pte_t pte)
{
	return pte_write(pte);
}

static inline int huge_pte_dirty(pte_t pte)
{
	return pte_dirty(pte);
}

static inline pte_t huge_pte_mkwrite(pte_t pte)
{
	return pte_mkwrite(pte);
}

static inline pte_t huge_pte_mkdirty(pte_t pte)
{
	return pte_mkdirty(pte);
}

static inline pte_t huge_pte_wrprotect(pte_t pte)
{
	return pte_wrprotect(pte);
}

static inline pte_t huge_pte_modify(pte_t pte, pgprot_t newprot)
{
	return pte_modify(pte, newprot);
}

#endif /* _ASM_S390_HUGETLB_H */
Commit	Line	Data
53492b1d GS	1	/*
	2	* IBM System z Huge TLB Page Support for Kernel.
	3	*
	4	* Copyright IBM Corp. 2008
	5	* Author(s): Gerald Schaefer <gerald.schaefer@de.ibm.com>
	6	*/
	7
	8	#ifndef _ASM_S390_HUGETLB_H
	9	#define _ASM_S390_HUGETLB_H
	10
	11	#include <asm/page.h>
	12	#include <asm/pgtable.h>
	13
	14
	15	#define is_hugepage_only_range(mm, addr, len) 0
	16	#define hugetlb_free_pgd_range free_pgd_range
	17
	18	void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
	19	pte_t *ptep, pte_t pte);
e5098611 MS	20	pte_t huge_ptep_get(pte_t *ptep);
	21	pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
	22	unsigned long addr, pte_t *ptep);
53492b1d GS	23
	24	/*
	25	* If the arch doesn't supply something else, assume that hugepage
	26	* size aligned regions are ok without further preparation.
	27	*/
a5516438 AK	28	static inline int prepare_hugepage_range(struct file *file,
a5516438 AK	29	unsigned long addr, unsigned long len)
53492b1d GS	30	{
	31	if (len & ~HPAGE_MASK)
	32	return -EINVAL;
	33	if (addr & ~HPAGE_MASK)
	34	return -EINVAL;
	35	return 0;
	36	}
	37
5d3a551c	38	#define arch_clear_hugepage_flags(page) do { } while (0)
53492b1d	39
e5098611 MS	40	static inline void huge_pte_clear(struct mm_struct *mm, unsigned long addr,
e5098611 MS	41	pte_t *ptep)
53492b1d	42	{
e5098611	43	pte_val(*ptep) = _SEGMENT_ENTRY_EMPTY;
53492b1d GS	44	}
53492b1d GS	45
e5098611 MS	46	static inline void huge_ptep_clear_flush(struct vm_area_struct *vma,
e5098611 MS	47	unsigned long address, pte_t *ptep)
53492b1d	48	{
e5098611	49	huge_ptep_get_and_clear(vma->vm_mm, address, ptep);
53492b1d GS	50	}
53492b1d GS	51
e5098611 MS	52	static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma,
	53	unsigned long addr, pte_t *ptep,
	54	pte_t pte, int dirty)
53492b1d	55	{
e5098611 MS	56	int changed = !pte_same(huge_ptep_get(ptep), pte);
	57	if (changed) {
	58	huge_ptep_get_and_clear(vma->vm_mm, addr, ptep);
	59	set_huge_pte_at(vma->vm_mm, addr, ptep, pte);
53492b1d	60	}
e5098611	61	return changed;
53492b1d GS	62	}
53492b1d GS	63
e5098611 MS	64	static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
e5098611 MS	65	unsigned long addr, pte_t *ptep)
53492b1d	66	{
e5098611 MS	67	pte_t pte = huge_ptep_get_and_clear(mm, addr, ptep);
e5098611 MS	68	set_huge_pte_at(mm, addr, ptep, pte_wrprotect(pte));
53492b1d GS	69	}
53492b1d GS	70
e5098611	71	static inline pte_t mk_huge_pte(struct page *page, pgprot_t pgprot)
53492b1d	72	{
e5098611	73	return mk_pte(page, pgprot);
53492b1d GS	74	}
53492b1d GS	75
e5098611	76	static inline int huge_pte_none(pte_t pte)
106c992a	77	{
e5098611	78	return pte_none(pte);
106c992a GS	79	}
	80
	81	static inline int huge_pte_write(pte_t pte)
	82	{
e5098611	83	return pte_write(pte);
106c992a GS	84	}
	85
	86	static inline int huge_pte_dirty(pte_t pte)
	87	{
e5098611	88	return pte_dirty(pte);
106c992a GS	89	}
	90
	91	static inline pte_t huge_pte_mkwrite(pte_t pte)
	92	{
e5098611	93	return pte_mkwrite(pte);
106c992a GS	94	}
	95
	96	static inline pte_t huge_pte_mkdirty(pte_t pte)
	97	{
e5098611	98	return pte_mkdirty(pte);
106c992a GS	99	}
106c992a GS	100
e5098611	101	static inline pte_t huge_pte_wrprotect(pte_t pte)
106c992a	102	{
e5098611	103	return pte_wrprotect(pte);
106c992a GS	104	}
106c992a GS	105
e5098611	106	static inline pte_t huge_pte_modify(pte_t pte, pgprot_t newprot)
106c992a	107	{
e5098611	108	return pte_modify(pte, newprot);
106c992a GS	109	}
106c992a GS	110
53492b1d	111	#endif /* _ASM_S390_HUGETLB_H */