[linux-2.6-block.git] / include / asm-s390 / pgalloc.h

/*
 *  include/asm-s390/pgalloc.h
 *
 *  S390 version
 *    Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
 *    Author(s): Hartmut Penner (hp@de.ibm.com)
 *               Martin Schwidefsky (schwidefsky@de.ibm.com)
 *
 *  Derived from "include/asm-i386/pgalloc.h"
 *    Copyright (C) 1994  Linus Torvalds
 */

#ifndef _S390_PGALLOC_H
#define _S390_PGALLOC_H

#include <linux/threads.h>
#include <linux/gfp.h>
#include <linux/mm.h>

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

unsigned long *crst_table_alloc(struct mm_struct *, int);
void crst_table_free(struct mm_struct *, unsigned long *);

unsigned long *page_table_alloc(struct mm_struct *);
void page_table_free(struct mm_struct *, unsigned long *);
void disable_noexec(struct mm_struct *, struct task_struct *);

static inline void clear_table(unsigned long *s, unsigned long val, size_t n)
{
	*s = val;
	n = (n / 256) - 1;
	asm volatile(
#ifdef CONFIG_64BIT
		"	mvc	8(248,%0),0(%0)\n"
#else
		"	mvc	4(252,%0),0(%0)\n"
#endif
		"0:	mvc	256(256,%0),0(%0)\n"
		"	la	%0,256(%0)\n"
		"	brct	%1,0b\n"
		: "+a" (s), "+d" (n));
}

static inline void crst_table_init(unsigned long *crst, unsigned long entry)
{
	clear_table(crst, entry, sizeof(unsigned long)*2048);
	crst = get_shadow_table(crst);
	if (crst)
		clear_table(crst, entry, sizeof(unsigned long)*2048);
}

#ifndef __s390x__

static inline unsigned long pgd_entry_type(struct mm_struct *mm)
{
	return _SEGMENT_ENTRY_EMPTY;
}

#define pud_alloc_one(mm,address)		({ BUG(); ((pud_t *)2); })
#define pud_free(mm, x)				do { } while (0)

#define pmd_alloc_one(mm,address)		({ BUG(); ((pmd_t *)2); })
#define pmd_free(mm, x)				do { } while (0)

#define pgd_populate(mm, pgd, pud)		BUG()
#define pgd_populate_kernel(mm, pgd, pud)	BUG()

#define pud_populate(mm, pud, pmd)		BUG()
#define pud_populate_kernel(mm, pud, pmd)	BUG()

#else /* __s390x__ */

static inline unsigned long pgd_entry_type(struct mm_struct *mm)
{
	return _REGION3_ENTRY_EMPTY;
}

#define pud_alloc_one(mm,address)		({ BUG(); ((pud_t *)2); })
#define pud_free(mm, x)				do { } while (0)

static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long vmaddr)
{
	unsigned long *table = crst_table_alloc(mm, mm->context.noexec);
	if (table)
		crst_table_init(table, _SEGMENT_ENTRY_EMPTY);
	return (pmd_t *) table;
}
#define pmd_free(mm, pmd) crst_table_free(mm, (unsigned long *) pmd)

#define pgd_populate(mm, pgd, pud)		BUG()
#define pgd_populate_kernel(mm, pgd, pud)	BUG()

static inline void pud_populate_kernel(struct mm_struct *mm,
				       pud_t *pud, pmd_t *pmd)
{
	pud_val(*pud) = _REGION3_ENTRY | __pa(pmd);
}

static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
{
	pud_populate_kernel(mm, pud, pmd);
	if (mm->context.noexec) {
		pud = get_shadow_table(pud);
		pmd = get_shadow_table(pmd);
		pud_populate_kernel(mm, pud, pmd);
	}
}

#endif /* __s390x__ */

static inline pgd_t *pgd_alloc(struct mm_struct *mm)
{
	unsigned long *crst;

	INIT_LIST_HEAD(&mm->context.crst_list);
	INIT_LIST_HEAD(&mm->context.pgtable_list);
	crst = crst_table_alloc(mm, s390_noexec);
	if (crst)
		crst_table_init(crst, pgd_entry_type(mm));
	return (pgd_t *) crst;
}
#define pgd_free(mm, pgd) crst_table_free(mm, (unsigned long *) pgd)

static inline void pmd_populate_kernel(struct mm_struct *mm,
				       pmd_t *pmd, pte_t *pte)
{
	pmd_val(*pmd) = _SEGMENT_ENTRY + __pa(pte);
}

static inline void pmd_populate(struct mm_struct *mm,
				pmd_t *pmd, pgtable_t pte)
{
	pmd_populate_kernel(mm, pmd, pte);
	if (mm->context.noexec) {
		pmd = get_shadow_table(pmd);
		pmd_populate_kernel(mm, pmd, pte + PTRS_PER_PTE);
	}
}

#define pmd_pgtable(pmd) \
	(pgtable_t)(pmd_val(pmd) & -sizeof(pte_t)*PTRS_PER_PTE)

/*
 * page table entry allocation/free routines.
 */
#define pte_alloc_one_kernel(mm, vmaddr) ((pte_t *) page_table_alloc(mm))
#define pte_alloc_one(mm, vmaddr) ((pte_t *) page_table_alloc(mm))

#define pte_free_kernel(mm, pte) page_table_free(mm, (unsigned long *) pte)
#define pte_free(mm, pte) page_table_free(mm, (unsigned long *) pte)

#endif /* _S390_PGALLOC_H */
Commit	Line	Data
1da177e4 LT	1	/*
	2	* include/asm-s390/pgalloc.h
	3	*
	4	* S390 version
	5	* Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
	6	* Author(s): Hartmut Penner (hp@de.ibm.com)
	7	* Martin Schwidefsky (schwidefsky@de.ibm.com)
	8	*
	9	* Derived from "include/asm-i386/pgalloc.h"
	10	* Copyright (C) 1994 Linus Torvalds
	11	*/
	12
	13	#ifndef _S390_PGALLOC_H
	14	#define _S390_PGALLOC_H
	15
1da177e4 LT	16	#include <linux/threads.h>
	17	#include <linux/gfp.h>
	18	#include <linux/mm.h>
	19
	20	#define check_pgt_cache() do {} while (0)
	21
3610cce8	22	unsigned long crst_table_alloc(struct mm_struct , int);
146e4b3c	23	void crst_table_free(struct mm_struct , unsigned long );
9282ed92	24
146e4b3c MS	25	unsigned long page_table_alloc(struct mm_struct );
	26	void page_table_free(struct mm_struct , unsigned long );
	27	void disable_noexec(struct mm_struct , struct task_struct );
1da177e4	28
3610cce8	29	static inline void clear_table(unsigned long *s, unsigned long val, size_t n)
1da177e4	30	{
3610cce8 MS	31	*s = val;
	32	n = (n / 256) - 1;
	33	asm volatile(
	34	#ifdef CONFIG_64BIT
	35	" mvc 8(248,%0),0(%0)\n"
9282ed92	36	#else
3610cce8	37	" mvc 4(252,%0),0(%0)\n"
9282ed92	38	#endif
3610cce8 MS	39	"0: mvc 256(256,%0),0(%0)\n"
	40	" la %0,256(%0)\n"
	41	" brct %1,0b\n"
	42	: "+a" (s), "+d" (n));
1da177e4 LT	43	}
1da177e4 LT	44
3610cce8	45	static inline void crst_table_init(unsigned long *crst, unsigned long entry)
1da177e4	46	{
3610cce8 MS	47	clear_table(crst, entry, sizeof(unsigned long)*2048);
	48	crst = get_shadow_table(crst);
	49	if (crst)
	50	clear_table(crst, entry, sizeof(unsigned long)*2048);
1da177e4 LT	51	}
	52
	53	#ifndef __s390x__
3610cce8 MS	54
	55	static inline unsigned long pgd_entry_type(struct mm_struct *mm)
	56	{
	57	return _SEGMENT_ENTRY_EMPTY;
	58	}
	59
190a1d72	60	#define pud_alloc_one(mm,address) ({ BUG(); ((pud_t *)2); })
5e541973	61	#define pud_free(mm, x) do { } while (0)
190a1d72	62
3610cce8	63	#define pmd_alloc_one(mm,address) ({ BUG(); ((pmd_t *)2); })
5e541973	64	#define pmd_free(mm, x) do { } while (0)
3610cce8	65
190a1d72 MS	66	#define pgd_populate(mm, pgd, pud) BUG()
	67	#define pgd_populate_kernel(mm, pgd, pud) BUG()
	68
	69	#define pud_populate(mm, pud, pmd) BUG()
	70	#define pud_populate_kernel(mm, pud, pmd) BUG()
3610cce8	71
1da177e4	72	#else /* __s390x__ */
3610cce8 MS	73
3610cce8 MS	74	static inline unsigned long pgd_entry_type(struct mm_struct *mm)
1da177e4	75	{
3610cce8	76	return _REGION3_ENTRY_EMPTY;
1da177e4 LT	77	}
1da177e4 LT	78
190a1d72	79	#define pud_alloc_one(mm,address) ({ BUG(); ((pud_t *)2); })
5e541973	80	#define pud_free(mm, x) do { } while (0)
190a1d72	81
3610cce8	82	static inline pmd_t pmd_alloc_one(struct mm_struct mm, unsigned long vmaddr)
1da177e4	83	{
146e4b3c MS	84	unsigned long *table = crst_table_alloc(mm, mm->context.noexec);
	85	if (table)
	86	crst_table_init(table, _SEGMENT_ENTRY_EMPTY);
	87	return (pmd_t *) table;
1da177e4	88	}
146e4b3c	89	#define pmd_free(mm, pmd) crst_table_free(mm, (unsigned long *) pmd)
1da177e4	90
190a1d72 MS	91	#define pgd_populate(mm, pgd, pud) BUG()
	92	#define pgd_populate_kernel(mm, pgd, pud) BUG()
	93
	94	static inline void pud_populate_kernel(struct mm_struct *mm,
	95	pud_t pud, pmd_t pmd)
1da177e4	96	{
190a1d72	97	pud_val(*pud) = _REGION3_ENTRY \| __pa(pmd);
1da177e4 LT	98	}
1da177e4 LT	99
190a1d72	100	static inline void pud_populate(struct mm_struct mm, pud_t pud, pmd_t *pmd)
c1821c2e	101	{
190a1d72	102	pud_populate_kernel(mm, pud, pmd);
146e4b3c MS	103	if (mm->context.noexec) {
	104	pud = get_shadow_table(pud);
	105	pmd = get_shadow_table(pmd);
	106	pud_populate_kernel(mm, pud, pmd);
	107	}
c1821c2e GS	108	}
c1821c2e GS	109
1da177e4 LT	110	#endif /* __s390x__ */
1da177e4 LT	111
3610cce8 MS	112	static inline pgd_t pgd_alloc(struct mm_struct mm)
3610cce8 MS	113	{
146e4b3c MS	114	unsigned long *crst;
	115
	116	INIT_LIST_HEAD(&mm->context.crst_list);
	117	INIT_LIST_HEAD(&mm->context.pgtable_list);
	118	crst = crst_table_alloc(mm, s390_noexec);
3610cce8 MS	119	if (crst)
	120	crst_table_init(crst, pgd_entry_type(mm));
	121	return (pgd_t *) crst;
	122	}
146e4b3c	123	#define pgd_free(mm, pgd) crst_table_free(mm, (unsigned long *) pgd)
3610cce8	124
146e4b3c MS	125	static inline void pmd_populate_kernel(struct mm_struct *mm,
146e4b3c MS	126	pmd_t pmd, pte_t pte)
1da177e4	127	{
3610cce8	128	pmd_val(*pmd) = _SEGMENT_ENTRY + __pa(pte);
1da177e4 LT	129	}
1da177e4 LT	130
146e4b3c MS	131	static inline void pmd_populate(struct mm_struct *mm,
146e4b3c MS	132	pmd_t *pmd, pgtable_t pte)
1da177e4	133	{
c1821c2e	134	pmd_populate_kernel(mm, pmd, pte);
146e4b3c MS	135	if (mm->context.noexec) {
	136	pmd = get_shadow_table(pmd);
	137	pmd_populate_kernel(mm, pmd, pte + PTRS_PER_PTE);
	138	}
1da177e4	139	}
146e4b3c MS	140
	141	#define pmd_pgtable(pmd) \
	142	(pgtable_t)(pmd_val(pmd) & -sizeof(pte_t)*PTRS_PER_PTE)
1da177e4 LT	143
	144	/*
	145	* page table entry allocation/free routines.
	146	*/
146e4b3c MS	147	#define pte_alloc_one_kernel(mm, vmaddr) ((pte_t *) page_table_alloc(mm))
	148	#define pte_alloc_one(mm, vmaddr) ((pte_t *) page_table_alloc(mm))
	149
	150	#define pte_free_kernel(mm, pte) page_table_free(mm, (unsigned long *) pte)
	151	#define pte_free(mm, pte) page_table_free(mm, (unsigned long *) pte)
1da177e4	152
1da177e4	153	#endif /* _S390_PGALLOC_H */