| /* |
| * 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) |
| { |
| 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) |
| { |
| 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 */ |