154 lines
3.9 KiB
C
154 lines
3.9 KiB
C
/* 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 (hp@de.ibm.com)
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* Martin Schwidefsky (schwidefsky@de.ibm.com)
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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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set_pgd(pgd, __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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set_p4d(p4d, __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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set_pud(pud, __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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set_pmd(pmd, __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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