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153 lines
3.9 KiB
153 lines
3.9 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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/* |
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* S390 version |
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* Copyright IBM Corp. 1999, 2000 |
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* Author(s): Hartmut Penner ([email protected]) |
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* Martin Schwidefsky ([email protected]) |
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* |
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* Derived from "include/asm-i386/pgalloc.h" |
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* Copyright (C) 1994 Linus Torvalds |
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*/ |
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#ifndef _S390_PGALLOC_H |
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#define _S390_PGALLOC_H |
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#include <linux/threads.h> |
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#include <linux/string.h> |
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#include <linux/gfp.h> |
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#include <linux/mm.h> |
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#define CRST_ALLOC_ORDER 2 |
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unsigned long *crst_table_alloc(struct mm_struct *); |
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void crst_table_free(struct mm_struct *, unsigned long *); |
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unsigned long *page_table_alloc(struct mm_struct *); |
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struct page *page_table_alloc_pgste(struct mm_struct *mm); |
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void page_table_free(struct mm_struct *, unsigned long *); |
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void page_table_free_rcu(struct mmu_gather *, unsigned long *, unsigned long); |
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void page_table_free_pgste(struct page *page); |
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extern int page_table_allocate_pgste; |
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static inline void crst_table_init(unsigned long *crst, unsigned long entry) |
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{ |
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memset64((u64 *)crst, entry, _CRST_ENTRIES); |
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} |
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int crst_table_upgrade(struct mm_struct *mm, unsigned long limit); |
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static inline unsigned long check_asce_limit(struct mm_struct *mm, unsigned long addr, |
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unsigned long len) |
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{ |
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int rc; |
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if (addr + len > mm->context.asce_limit && |
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addr + len <= TASK_SIZE) { |
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rc = crst_table_upgrade(mm, addr + len); |
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if (rc) |
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return (unsigned long) rc; |
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} |
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return addr; |
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} |
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static inline p4d_t *p4d_alloc_one(struct mm_struct *mm, unsigned long address) |
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{ |
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unsigned long *table = crst_table_alloc(mm); |
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if (table) |
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crst_table_init(table, _REGION2_ENTRY_EMPTY); |
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return (p4d_t *) table; |
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} |
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static inline void p4d_free(struct mm_struct *mm, p4d_t *p4d) |
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{ |
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if (!mm_p4d_folded(mm)) |
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crst_table_free(mm, (unsigned long *) p4d); |
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} |
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static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long address) |
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{ |
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unsigned long *table = crst_table_alloc(mm); |
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if (table) |
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crst_table_init(table, _REGION3_ENTRY_EMPTY); |
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return (pud_t *) table; |
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} |
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static inline void pud_free(struct mm_struct *mm, pud_t *pud) |
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{ |
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if (!mm_pud_folded(mm)) |
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crst_table_free(mm, (unsigned long *) pud); |
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} |
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static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long vmaddr) |
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{ |
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unsigned long *table = crst_table_alloc(mm); |
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if (!table) |
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return NULL; |
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crst_table_init(table, _SEGMENT_ENTRY_EMPTY); |
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if (!pgtable_pmd_page_ctor(virt_to_page(table))) { |
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crst_table_free(mm, table); |
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return NULL; |
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} |
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return (pmd_t *) table; |
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} |
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static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd) |
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{ |
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if (mm_pmd_folded(mm)) |
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return; |
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pgtable_pmd_page_dtor(virt_to_page(pmd)); |
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crst_table_free(mm, (unsigned long *) pmd); |
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} |
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static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, p4d_t *p4d) |
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{ |
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pgd_val(*pgd) = _REGION1_ENTRY | __pa(p4d); |
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} |
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static inline void p4d_populate(struct mm_struct *mm, p4d_t *p4d, pud_t *pud) |
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{ |
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p4d_val(*p4d) = _REGION2_ENTRY | __pa(pud); |
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} |
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static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd) |
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{ |
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pud_val(*pud) = _REGION3_ENTRY | __pa(pmd); |
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} |
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static inline pgd_t *pgd_alloc(struct mm_struct *mm) |
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{ |
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return (pgd_t *) crst_table_alloc(mm); |
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} |
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static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd) |
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{ |
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crst_table_free(mm, (unsigned long *) pgd); |
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} |
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static inline void pmd_populate(struct mm_struct *mm, |
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pmd_t *pmd, pgtable_t pte) |
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{ |
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pmd_val(*pmd) = _SEGMENT_ENTRY + __pa(pte); |
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} |
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#define pmd_populate_kernel(mm, pmd, pte) pmd_populate(mm, pmd, pte) |
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/* |
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* page table entry allocation/free routines. |
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*/ |
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#define pte_alloc_one_kernel(mm) ((pte_t *)page_table_alloc(mm)) |
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#define pte_alloc_one(mm) ((pte_t *)page_table_alloc(mm)) |
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#define pte_free_kernel(mm, pte) page_table_free(mm, (unsigned long *) pte) |
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#define pte_free(mm, pte) page_table_free(mm, (unsigned long *) pte) |
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void vmem_map_init(void); |
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void *vmem_crst_alloc(unsigned long val); |
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pte_t *vmem_pte_alloc(void); |
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unsigned long base_asce_alloc(unsigned long addr, unsigned long num_pages); |
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void base_asce_free(unsigned long asce); |
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#endif /* _S390_PGALLOC_H */
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