From 146e4b3c8b92071b18f0b2e6f47165bad4f9e825 Mon Sep 17 00:00:00 2001 From: Martin Schwidefsky Date: Sat, 9 Feb 2008 18:24:35 +0100 Subject: [S390] 1K/2K page table pages. This patch implements 1K/2K page table pages for s390. Signed-off-by: Martin Schwidefsky --- include/asm-s390/pgalloc.h | 79 +++++++++++++++++++++------------------------- 1 file changed, 36 insertions(+), 43 deletions(-) (limited to 'include/asm-s390/pgalloc.h') diff --git a/include/asm-s390/pgalloc.h b/include/asm-s390/pgalloc.h index 900d44807e1..af4aee856df 100644 --- a/include/asm-s390/pgalloc.h +++ b/include/asm-s390/pgalloc.h @@ -20,10 +20,11 @@ #define check_pgt_cache() do {} while (0) unsigned long *crst_table_alloc(struct mm_struct *, int); -void crst_table_free(unsigned long *); +void crst_table_free(struct mm_struct *, unsigned long *); -unsigned long *page_table_alloc(int); -void page_table_free(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) { @@ -80,12 +81,12 @@ static inline unsigned long pgd_entry_type(struct mm_struct *mm) static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long vmaddr) { - unsigned long *crst = crst_table_alloc(mm, s390_noexec); - if (crst) - crst_table_init(crst, _SEGMENT_ENTRY_EMPTY); - return (pmd_t *) crst; + 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((unsigned long *)pmd) +#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() @@ -98,63 +99,55 @@ static inline void pud_populate_kernel(struct mm_struct *mm, static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd) { - pud_t *shadow_pud = get_shadow_table(pud); - pmd_t *shadow_pmd = get_shadow_table(pmd); - - if (shadow_pud && shadow_pmd) - pud_populate_kernel(mm, shadow_pud, shadow_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 = crst_table_alloc(mm, s390_noexec); + 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((unsigned long *) pgd) +#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) +static inline void pmd_populate_kernel(struct mm_struct *mm, + pmd_t *pmd, pte_t *pte) { -#ifndef __s390x__ - pmd_val(pmd[0]) = _SEGMENT_ENTRY + __pa(pte); - pmd_val(pmd[1]) = _SEGMENT_ENTRY + __pa(pte+256); - pmd_val(pmd[2]) = _SEGMENT_ENTRY + __pa(pte+512); - pmd_val(pmd[3]) = _SEGMENT_ENTRY + __pa(pte+768); -#else /* __s390x__ */ pmd_val(*pmd) = _SEGMENT_ENTRY + __pa(pte); - pmd_val1(*pmd) = _SEGMENT_ENTRY + __pa(pte+256); -#endif /* __s390x__ */ } -static inline void -pmd_populate(struct mm_struct *mm, pmd_t *pmd, pgtable_t page) +static inline void pmd_populate(struct mm_struct *mm, + pmd_t *pmd, pgtable_t pte) { - pte_t *pte = (pte_t *)page_to_phys(page); - pmd_t *shadow_pmd = get_shadow_table(pmd); - pte_t *shadow_pte = get_shadow_pte(pte); - pmd_populate_kernel(mm, pmd, pte); - if (shadow_pmd && shadow_pte) - pmd_populate_kernel(mm, shadow_pmd, shadow_pte); + if (mm->context.noexec) { + pmd = get_shadow_table(pmd); + pmd_populate_kernel(mm, pmd, pte + PTRS_PER_PTE); + } } -#define pmd_pgtable(pmd) pmd_page(pmd) + +#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(s390_noexec)) -#define pte_alloc_one(mm, vmaddr) \ - virt_to_page(page_table_alloc(s390_noexec)) - -#define pte_free_kernel(mm, pte) \ - page_table_free((unsigned long *) pte) -#define pte_free(mm, pte) \ - page_table_free((unsigned long *) page_to_phys((struct page *) pte)) +#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 */ -- cgit v1.2.3-70-g09d2