/* * 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(unsigned long *); unsigned long *page_table_alloc(int); void page_table_free(unsigned long *); 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(x) do { } while (0) #define pmd_alloc_one(mm,address) ({ BUG(); ((pmd_t *)2); }) #define pmd_free(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) { return _REGION3_ENTRY_EMPTY; } #define pud_alloc_one(mm,address) ({ BUG(); ((pud_t *)2); }) #define pud_free(x) do { } while (0) 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; } #define pmd_free(pmd) crst_table_free((unsigned long *) pmd) #define pgd_populate(mm, pgd, pud) BUG() #define pgd_populate_kernel(mm, pgd, pud) BUG() 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_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); } #endif /* __s390x__ */ static inline pgd_t *pgd_alloc(struct mm_struct *mm) { unsigned long *crst = crst_table_alloc(mm, s390_noexec); if (crst) crst_table_init(crst, pgd_entry_type(mm)); return (pgd_t *) crst; } #define pgd_free(pgd) crst_table_free((unsigned long *) pgd) 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, struct page *page) { 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); } /* * 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(pte) \ page_table_free((unsigned long *) pte) #define pte_free(pte) \ page_table_free((unsigned long *) page_to_phys((struct page *) pte)) #endif /* _S390_PGALLOC_H */