[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)
{
	if (mm->context.asce_limit <= (1UL << 31))
		return _SEGMENT_ENTRY_EMPTY;
	if (mm->context.asce_limit <= (1UL << 42))
		return _REGION3_ENTRY_EMPTY;
	return _REGION2_ENTRY_EMPTY;
}

int crst_table_upgrade(struct mm_struct *, unsigned long limit);
void crst_table_downgrade(struct mm_struct *, unsigned long limit);

static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long address)
{
	unsigned long *table = crst_table_alloc(mm, mm->context.noexec);
	if (table)
		crst_table_init(table, _REGION3_ENTRY_EMPTY);
	return (pud_t *) table;
}
#define pud_free(mm, pud) crst_table_free(mm, (unsigned long *) pud)

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)

static inline void pgd_populate_kernel(struct mm_struct *mm,
				       pgd_t *pgd, pud_t *pud)
{
	pgd_val(*pgd) = _REGION2_ENTRY | __pa(pud);
}

static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pud_t *pud)
{
	pgd_populate_kernel(mm, pgd, pud);
	if (mm->context.noexec) {
		pgd = get_shadow_table(pgd);
		pud = get_shadow_table(pud);
		pgd_populate_kernel(mm, pgd, pud);
	}
}

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)
{
	INIT_LIST_HEAD(&mm->context.crst_list);
	INIT_LIST_HEAD(&mm->context.pgtable_list);
	return (pgd_t *) crst_table_alloc(mm, s390_noexec);
}
#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	{
6252d702 MS	76	if (mm->context.asce_limit <= (1UL << 31))
	77	return _SEGMENT_ENTRY_EMPTY;
	78	if (mm->context.asce_limit <= (1UL << 42))
	79	return _REGION3_ENTRY_EMPTY;
5a216a20	80	return _REGION2_ENTRY_EMPTY;
1da177e4 LT	81	}
1da177e4 LT	82
6252d702 MS	83	int crst_table_upgrade(struct mm_struct *, unsigned long limit);
	84	void crst_table_downgrade(struct mm_struct *, unsigned long limit);
	85
5a216a20 MS	86	static inline pud_t pud_alloc_one(struct mm_struct mm, unsigned long address)
	87	{
	88	unsigned long *table = crst_table_alloc(mm, mm->context.noexec);
	89	if (table)
	90	crst_table_init(table, _REGION3_ENTRY_EMPTY);
	91	return (pud_t *) table;
	92	}
	93	#define pud_free(mm, pud) crst_table_free(mm, (unsigned long *) pud)
190a1d72	94
3610cce8	95	static inline pmd_t pmd_alloc_one(struct mm_struct mm, unsigned long vmaddr)
1da177e4	96	{
146e4b3c MS	97	unsigned long *table = crst_table_alloc(mm, mm->context.noexec);
	98	if (table)
	99	crst_table_init(table, _SEGMENT_ENTRY_EMPTY);
	100	return (pmd_t *) table;
1da177e4	101	}
146e4b3c	102	#define pmd_free(mm, pmd) crst_table_free(mm, (unsigned long *) pmd)
1da177e4	103
5a216a20 MS	104	static inline void pgd_populate_kernel(struct mm_struct *mm,
	105	pgd_t pgd, pud_t pud)
	106	{
	107	pgd_val(*pgd) = _REGION2_ENTRY \| __pa(pud);
	108	}
	109
	110	static inline void pgd_populate(struct mm_struct mm, pgd_t pgd, pud_t *pud)
	111	{
5a216a20	112	pgd_populate_kernel(mm, pgd, pud);
6252d702 MS	113	if (mm->context.noexec) {
	114	pgd = get_shadow_table(pgd);
	115	pud = get_shadow_table(pud);
	116	pgd_populate_kernel(mm, pgd, pud);
	117	}
5a216a20	118	}
190a1d72 MS	119
	120	static inline void pud_populate_kernel(struct mm_struct *mm,
	121	pud_t pud, pmd_t pmd)
1da177e4	122	{
190a1d72	123	pud_val(*pud) = _REGION3_ENTRY \| __pa(pmd);
1da177e4 LT	124	}
1da177e4 LT	125
190a1d72	126	static inline void pud_populate(struct mm_struct mm, pud_t pud, pmd_t *pmd)
c1821c2e	127	{
190a1d72	128	pud_populate_kernel(mm, pud, pmd);
146e4b3c MS	129	if (mm->context.noexec) {
	130	pud = get_shadow_table(pud);
	131	pmd = get_shadow_table(pmd);
	132	pud_populate_kernel(mm, pud, pmd);
	133	}
c1821c2e GS	134	}
c1821c2e GS	135
1da177e4 LT	136	#endif /* __s390x__ */
1da177e4 LT	137
3610cce8 MS	138	static inline pgd_t pgd_alloc(struct mm_struct mm)
3610cce8 MS	139	{
146e4b3c MS	140	INIT_LIST_HEAD(&mm->context.crst_list);
146e4b3c MS	141	INIT_LIST_HEAD(&mm->context.pgtable_list);
6252d702	142	return (pgd_t *) crst_table_alloc(mm, s390_noexec);
3610cce8	143	}
146e4b3c	144	#define pgd_free(mm, pgd) crst_table_free(mm, (unsigned long *) pgd)
3610cce8	145
146e4b3c MS	146	static inline void pmd_populate_kernel(struct mm_struct *mm,
146e4b3c MS	147	pmd_t pmd, pte_t pte)
1da177e4	148	{
3610cce8	149	pmd_val(*pmd) = _SEGMENT_ENTRY + __pa(pte);
1da177e4 LT	150	}
1da177e4 LT	151
146e4b3c MS	152	static inline void pmd_populate(struct mm_struct *mm,
146e4b3c MS	153	pmd_t *pmd, pgtable_t pte)
1da177e4	154	{
c1821c2e	155	pmd_populate_kernel(mm, pmd, pte);
146e4b3c MS	156	if (mm->context.noexec) {
	157	pmd = get_shadow_table(pmd);
	158	pmd_populate_kernel(mm, pmd, pte + PTRS_PER_PTE);
	159	}
1da177e4	160	}
146e4b3c MS	161
	162	#define pmd_pgtable(pmd) \
	163	(pgtable_t)(pmd_val(pmd) & -sizeof(pte_t)*PTRS_PER_PTE)
1da177e4 LT	164
	165	/*
	166	* page table entry allocation/free routines.
	167	*/
146e4b3c MS	168	#define pte_alloc_one_kernel(mm, vmaddr) ((pte_t *) page_table_alloc(mm))
	169	#define pte_alloc_one(mm, vmaddr) ((pte_t *) page_table_alloc(mm))
	170
	171	#define pte_free_kernel(mm, pte) page_table_free(mm, (unsigned long *) pte)
	172	#define pte_free(mm, pte) page_table_free(mm, (unsigned long *) pte)
1da177e4	173
1da177e4	174	#endif /* _S390_PGALLOC_H */