diff options
Diffstat (limited to 'kernel/arch/s390/include/asm/pgalloc.h')
-rw-r--r-- | kernel/arch/s390/include/asm/pgalloc.h | 132 |
1 files changed, 132 insertions, 0 deletions
diff --git a/kernel/arch/s390/include/asm/pgalloc.h b/kernel/arch/s390/include/asm/pgalloc.h new file mode 100644 index 000000000..7b7858f15 --- /dev/null +++ b/kernel/arch/s390/include/asm/pgalloc.h @@ -0,0 +1,132 @@ +/* + * S390 version + * Copyright IBM Corp. 1999, 2000 + * 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> + +unsigned long *crst_table_alloc(struct mm_struct *); +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 page_table_free_rcu(struct mmu_gather *, unsigned long *, unsigned long); +extern int page_table_allocate_pgste; + +int set_guest_storage_key(struct mm_struct *mm, unsigned long addr, + unsigned long key, bool nq); +unsigned long get_guest_storage_key(struct mm_struct *mm, unsigned long addr); + +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( + " mvc 8(248,%0),0(%0)\n" + "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); +} + +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); + 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); + + if (!table) + return NULL; + crst_table_init(table, _SEGMENT_ENTRY_EMPTY); + if (!pgtable_pmd_page_ctor(virt_to_page(table))) { + crst_table_free(mm, table); + return NULL; + } + return (pmd_t *) table; +} + +static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd) +{ + pgtable_pmd_page_dtor(virt_to_page(pmd)); + crst_table_free(mm, (unsigned long *) pmd); +} + +static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pud_t *pud) +{ + pgd_val(*pgd) = _REGION2_ENTRY | __pa(pud); +} + +static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd) +{ + pud_val(*pud) = _REGION3_ENTRY | __pa(pmd); +} + +static inline pgd_t *pgd_alloc(struct mm_struct *mm) +{ + spin_lock_init(&mm->context.list_lock); + INIT_LIST_HEAD(&mm->context.pgtable_list); + INIT_LIST_HEAD(&mm->context.gmap_list); + return (pgd_t *) crst_table_alloc(mm); +} +#define pgd_free(mm, pgd) crst_table_free(mm, (unsigned long *) pgd) + +static inline void pmd_populate(struct mm_struct *mm, + pmd_t *pmd, pgtable_t pte) +{ + pmd_val(*pmd) = _SEGMENT_ENTRY + __pa(pte); +} + +#define pmd_populate_kernel(mm, pmd, pte) pmd_populate(mm, pmd, 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 */ |