[linux-2.6-block.git] / arch / s390 / include / asm / 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 *);
void crst_table_free_rcu(struct mm_struct *, unsigned long *);

unsigned long *page_table_alloc(struct mm_struct *);
void page_table_free(struct mm_struct *, unsigned long *);
void page_table_free_rcu(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)
{
	typedef struct { char _[n]; } addrtype;

	*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), "=m" (*(addrtype *) s)
		: "m" (*(addrtype *) s));
}

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)
{
	spin_lock_init(&mm->context.list_lock);
	INIT_LIST_HEAD(&mm->context.crst_list);
	INIT_LIST_HEAD(&mm->context.pgtable_list);
	return (pgd_t *)
		crst_table_alloc(mm, user_mode == SECONDARY_SPACE_MODE);
}
#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)

extern void rcu_table_freelist_finish(void);

#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 );
80217147	24	void crst_table_free_rcu(struct mm_struct , unsigned long );
9282ed92	25
146e4b3c MS	26	unsigned long page_table_alloc(struct mm_struct );
146e4b3c MS	27	void page_table_free(struct mm_struct , unsigned long );
80217147	28	void page_table_free_rcu(struct mm_struct , unsigned long );
146e4b3c	29	void disable_noexec(struct mm_struct , struct task_struct );
1da177e4	30
3610cce8	31	static inline void clear_table(unsigned long *s, unsigned long val, size_t n)
1da177e4	32	{
4f7e90d6 MS	33	typedef struct { char _[n]; } addrtype;
4f7e90d6 MS	34
3610cce8 MS	35	*s = val;
	36	n = (n / 256) - 1;
	37	asm volatile(
	38	#ifdef CONFIG_64BIT
	39	" mvc 8(248,%0),0(%0)\n"
9282ed92	40	#else
3610cce8	41	" mvc 4(252,%0),0(%0)\n"
9282ed92	42	#endif
3610cce8 MS	43	"0: mvc 256(256,%0),0(%0)\n"
	44	" la %0,256(%0)\n"
	45	" brct %1,0b\n"
4f7e90d6 MS	46	: "+a" (s), "+d" (n), "=m" ((addrtype ) s)
4f7e90d6 MS	47	: "m" ((addrtype ) s));
1da177e4 LT	48	}
1da177e4 LT	49
3610cce8	50	static inline void crst_table_init(unsigned long *crst, unsigned long entry)
1da177e4	51	{
3610cce8 MS	52	clear_table(crst, entry, sizeof(unsigned long)*2048);
	53	crst = get_shadow_table(crst);
	54	if (crst)
	55	clear_table(crst, entry, sizeof(unsigned long)*2048);
1da177e4 LT	56	}
	57
	58	#ifndef __s390x__
3610cce8 MS	59
	60	static inline unsigned long pgd_entry_type(struct mm_struct *mm)
	61	{
	62	return _SEGMENT_ENTRY_EMPTY;
	63	}
	64
190a1d72	65	#define pud_alloc_one(mm,address) ({ BUG(); ((pud_t *)2); })
5e541973	66	#define pud_free(mm, x) do { } while (0)
190a1d72	67
3610cce8	68	#define pmd_alloc_one(mm,address) ({ BUG(); ((pmd_t *)2); })
5e541973	69	#define pmd_free(mm, x) do { } while (0)
3610cce8	70
190a1d72 MS	71	#define pgd_populate(mm, pgd, pud) BUG()
	72	#define pgd_populate_kernel(mm, pgd, pud) BUG()
	73
	74	#define pud_populate(mm, pud, pmd) BUG()
	75	#define pud_populate_kernel(mm, pud, pmd) BUG()
3610cce8	76
1da177e4	77	#else /* __s390x__ */
3610cce8 MS	78
3610cce8 MS	79	static inline unsigned long pgd_entry_type(struct mm_struct *mm)
1da177e4	80	{
6252d702 MS	81	if (mm->context.asce_limit <= (1UL << 31))
	82	return _SEGMENT_ENTRY_EMPTY;
	83	if (mm->context.asce_limit <= (1UL << 42))
	84	return _REGION3_ENTRY_EMPTY;
5a216a20	85	return _REGION2_ENTRY_EMPTY;
1da177e4 LT	86	}
1da177e4 LT	87
6252d702 MS	88	int crst_table_upgrade(struct mm_struct *, unsigned long limit);
	89	void crst_table_downgrade(struct mm_struct *, unsigned long limit);
	90
5a216a20 MS	91	static inline pud_t pud_alloc_one(struct mm_struct mm, unsigned long address)
	92	{
	93	unsigned long *table = crst_table_alloc(mm, mm->context.noexec);
	94	if (table)
	95	crst_table_init(table, _REGION3_ENTRY_EMPTY);
	96	return (pud_t *) table;
	97	}
	98	#define pud_free(mm, pud) crst_table_free(mm, (unsigned long *) pud)
190a1d72	99
3610cce8	100	static inline pmd_t pmd_alloc_one(struct mm_struct mm, unsigned long vmaddr)
1da177e4	101	{
146e4b3c MS	102	unsigned long *table = crst_table_alloc(mm, mm->context.noexec);
	103	if (table)
	104	crst_table_init(table, _SEGMENT_ENTRY_EMPTY);
	105	return (pmd_t *) table;
1da177e4	106	}
146e4b3c	107	#define pmd_free(mm, pmd) crst_table_free(mm, (unsigned long *) pmd)
1da177e4	108
5a216a20 MS	109	static inline void pgd_populate_kernel(struct mm_struct *mm,
	110	pgd_t pgd, pud_t pud)
	111	{
	112	pgd_val(*pgd) = _REGION2_ENTRY \| __pa(pud);
	113	}
	114
	115	static inline void pgd_populate(struct mm_struct mm, pgd_t pgd, pud_t *pud)
	116	{
5a216a20	117	pgd_populate_kernel(mm, pgd, pud);
6252d702 MS	118	if (mm->context.noexec) {
	119	pgd = get_shadow_table(pgd);
	120	pud = get_shadow_table(pud);
	121	pgd_populate_kernel(mm, pgd, pud);
	122	}
5a216a20	123	}
190a1d72 MS	124
	125	static inline void pud_populate_kernel(struct mm_struct *mm,
	126	pud_t pud, pmd_t pmd)
1da177e4	127	{
190a1d72	128	pud_val(*pud) = _REGION3_ENTRY \| __pa(pmd);
1da177e4 LT	129	}
1da177e4 LT	130
190a1d72	131	static inline void pud_populate(struct mm_struct mm, pud_t pud, pmd_t *pmd)
c1821c2e	132	{
190a1d72	133	pud_populate_kernel(mm, pud, pmd);
146e4b3c MS	134	if (mm->context.noexec) {
	135	pud = get_shadow_table(pud);
	136	pmd = get_shadow_table(pmd);
	137	pud_populate_kernel(mm, pud, pmd);
	138	}
c1821c2e GS	139	}
c1821c2e GS	140
1da177e4 LT	141	#endif /* __s390x__ */
1da177e4 LT	142
3610cce8 MS	143	static inline pgd_t pgd_alloc(struct mm_struct mm)
3610cce8 MS	144	{
50aa98ba	145	spin_lock_init(&mm->context.list_lock);
146e4b3c MS	146	INIT_LIST_HEAD(&mm->context.crst_list);
146e4b3c MS	147	INIT_LIST_HEAD(&mm->context.pgtable_list);
b11b5334 MS	148	return (pgd_t *)
b11b5334 MS	149	crst_table_alloc(mm, user_mode == SECONDARY_SPACE_MODE);
3610cce8	150	}
146e4b3c	151	#define pgd_free(mm, pgd) crst_table_free(mm, (unsigned long *) pgd)
3610cce8	152
146e4b3c MS	153	static inline void pmd_populate_kernel(struct mm_struct *mm,
146e4b3c MS	154	pmd_t pmd, pte_t pte)
1da177e4	155	{
3610cce8	156	pmd_val(*pmd) = _SEGMENT_ENTRY + __pa(pte);
1da177e4 LT	157	}
1da177e4 LT	158
146e4b3c MS	159	static inline void pmd_populate(struct mm_struct *mm,
146e4b3c MS	160	pmd_t *pmd, pgtable_t pte)
1da177e4	161	{
c1821c2e	162	pmd_populate_kernel(mm, pmd, pte);
146e4b3c MS	163	if (mm->context.noexec) {
	164	pmd = get_shadow_table(pmd);
	165	pmd_populate_kernel(mm, pmd, pte + PTRS_PER_PTE);
	166	}
1da177e4	167	}
146e4b3c MS	168
	169	#define pmd_pgtable(pmd) \
	170	(pgtable_t)(pmd_val(pmd) & -sizeof(pte_t)*PTRS_PER_PTE)
1da177e4 LT	171
	172	/*
	173	* page table entry allocation/free routines.
	174	*/
146e4b3c MS	175	#define pte_alloc_one_kernel(mm, vmaddr) ((pte_t *) page_table_alloc(mm))
	176	#define pte_alloc_one(mm, vmaddr) ((pte_t *) page_table_alloc(mm))
	177
	178	#define pte_free_kernel(mm, pte) page_table_free(mm, (unsigned long *) pte)
	179	#define pte_free(mm, pte) page_table_free(mm, (unsigned long *) pte)
1da177e4	180
80217147 MS	181	extern void rcu_table_freelist_finish(void);
80217147 MS	182
1da177e4	183	#endif /* _S390_PGALLOC_H */