[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
#define hugepages_supported()			(MACHINE_HAS_HPAGE)

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
7f9be775	17	#define hugepages_supported() (MACHINE_HAS_HPAGE)
53492b1d GS	18
	19	void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
	20	pte_t *ptep, pte_t pte);
e5098611 MS	21	pte_t huge_ptep_get(pte_t *ptep);
	22	pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
	23	unsigned long addr, pte_t *ptep);
53492b1d GS	24
	25	/*
	26	* If the arch doesn't supply something else, assume that hugepage
	27	* size aligned regions are ok without further preparation.
	28	*/
a5516438 AK	29	static inline int prepare_hugepage_range(struct file *file,
a5516438 AK	30	unsigned long addr, unsigned long len)
53492b1d GS	31	{
	32	if (len & ~HPAGE_MASK)
	33	return -EINVAL;
	34	if (addr & ~HPAGE_MASK)
	35	return -EINVAL;
	36	return 0;
	37	}
	38
5d3a551c	39	#define arch_clear_hugepage_flags(page) do { } while (0)
53492b1d	40
e5098611 MS	41	static inline void huge_pte_clear(struct mm_struct *mm, unsigned long addr,
e5098611 MS	42	pte_t *ptep)
53492b1d	43	{
e5098611	44	pte_val(*ptep) = _SEGMENT_ENTRY_EMPTY;
53492b1d GS	45	}
53492b1d GS	46
e5098611 MS	47	static inline void huge_ptep_clear_flush(struct vm_area_struct *vma,
e5098611 MS	48	unsigned long address, pte_t *ptep)
53492b1d	49	{
e5098611	50	huge_ptep_get_and_clear(vma->vm_mm, address, ptep);
53492b1d GS	51	}
53492b1d GS	52
e5098611 MS	53	static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma,
	54	unsigned long addr, pte_t *ptep,
	55	pte_t pte, int dirty)
53492b1d	56	{
e5098611 MS	57	int changed = !pte_same(huge_ptep_get(ptep), pte);
	58	if (changed) {
	59	huge_ptep_get_and_clear(vma->vm_mm, addr, ptep);
	60	set_huge_pte_at(vma->vm_mm, addr, ptep, pte);
53492b1d	61	}
e5098611	62	return changed;
53492b1d GS	63	}
53492b1d GS	64
e5098611 MS	65	static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
e5098611 MS	66	unsigned long addr, pte_t *ptep)
53492b1d	67	{
e5098611 MS	68	pte_t pte = huge_ptep_get_and_clear(mm, addr, ptep);
e5098611 MS	69	set_huge_pte_at(mm, addr, ptep, pte_wrprotect(pte));
53492b1d GS	70	}
53492b1d GS	71
e5098611	72	static inline pte_t mk_huge_pte(struct page *page, pgprot_t pgprot)
53492b1d	73	{
e5098611	74	return mk_pte(page, pgprot);
53492b1d GS	75	}
53492b1d GS	76
e5098611	77	static inline int huge_pte_none(pte_t pte)
106c992a	78	{
e5098611	79	return pte_none(pte);
106c992a GS	80	}
	81
	82	static inline int huge_pte_write(pte_t pte)
	83	{
e5098611	84	return pte_write(pte);
106c992a GS	85	}
	86
	87	static inline int huge_pte_dirty(pte_t pte)
	88	{
e5098611	89	return pte_dirty(pte);
106c992a GS	90	}
	91
	92	static inline pte_t huge_pte_mkwrite(pte_t pte)
	93	{
e5098611	94	return pte_mkwrite(pte);
106c992a GS	95	}
	96
	97	static inline pte_t huge_pte_mkdirty(pte_t pte)
	98	{
e5098611	99	return pte_mkdirty(pte);
106c992a GS	100	}
106c992a GS	101
e5098611	102	static inline pte_t huge_pte_wrprotect(pte_t pte)
106c992a	103	{
e5098611	104	return pte_wrprotect(pte);
106c992a GS	105	}
106c992a GS	106
e5098611	107	static inline pte_t huge_pte_modify(pte_t pte, pgprot_t newprot)
106c992a	108	{
e5098611	109	return pte_modify(pte, newprot);
106c992a GS	110	}
106c992a GS	111
53492b1d	112	#endif /* _ASM_S390_HUGETLB_H */