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5e5419734c
(with Martin Schwidefsky <schwidefsky@de.ibm.com>) The pgd/pud/pmd/pte page table allocation functions get a mm_struct pointer as first argument. The free functions do not get the mm_struct argument. This is 1) asymmetrical and 2) to do mm related page table allocations the mm argument is needed on the free function as well. [kamalesh@linux.vnet.ibm.com: i386 fix] [akpm@linux-foundation.org: coding-syle fixes] Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: <linux-arch@vger.kernel.org> Signed-off-by: Kamalesh Babulal <kamalesh@linux.vnet.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
160 lines
4.2 KiB
C
160 lines
4.2 KiB
C
/*
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* include/asm-s390/pgalloc.h
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*
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* S390 version
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* Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
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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/gfp.h>
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#include <linux/mm.h>
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#define check_pgt_cache() do {} while (0)
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unsigned long *crst_table_alloc(struct mm_struct *, int);
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void crst_table_free(unsigned long *);
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unsigned long *page_table_alloc(int);
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void page_table_free(unsigned long *);
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static inline void clear_table(unsigned long *s, unsigned long val, size_t n)
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{
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*s = val;
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n = (n / 256) - 1;
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asm volatile(
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#ifdef CONFIG_64BIT
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" mvc 8(248,%0),0(%0)\n"
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#else
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" mvc 4(252,%0),0(%0)\n"
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#endif
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"0: mvc 256(256,%0),0(%0)\n"
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" la %0,256(%0)\n"
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" brct %1,0b\n"
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: "+a" (s), "+d" (n));
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}
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static inline void crst_table_init(unsigned long *crst, unsigned long entry)
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{
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clear_table(crst, entry, sizeof(unsigned long)*2048);
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crst = get_shadow_table(crst);
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if (crst)
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clear_table(crst, entry, sizeof(unsigned long)*2048);
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}
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#ifndef __s390x__
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static inline unsigned long pgd_entry_type(struct mm_struct *mm)
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{
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return _SEGMENT_ENTRY_EMPTY;
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}
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#define pud_alloc_one(mm,address) ({ BUG(); ((pud_t *)2); })
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#define pud_free(mm, x) do { } while (0)
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#define pmd_alloc_one(mm,address) ({ BUG(); ((pmd_t *)2); })
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#define pmd_free(mm, x) do { } while (0)
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#define pgd_populate(mm, pgd, pud) BUG()
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#define pgd_populate_kernel(mm, pgd, pud) BUG()
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#define pud_populate(mm, pud, pmd) BUG()
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#define pud_populate_kernel(mm, pud, pmd) BUG()
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#else /* __s390x__ */
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static inline unsigned long pgd_entry_type(struct mm_struct *mm)
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{
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return _REGION3_ENTRY_EMPTY;
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}
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#define pud_alloc_one(mm,address) ({ BUG(); ((pud_t *)2); })
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#define pud_free(mm, x) do { } while (0)
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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 *crst = crst_table_alloc(mm, s390_noexec);
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if (crst)
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crst_table_init(crst, _SEGMENT_ENTRY_EMPTY);
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return (pmd_t *) crst;
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}
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#define pmd_free(mm, pmd) crst_table_free((unsigned long *)pmd)
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#define pgd_populate(mm, pgd, pud) BUG()
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#define pgd_populate_kernel(mm, pgd, pud) BUG()
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static inline void pud_populate_kernel(struct mm_struct *mm,
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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 void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
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{
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pud_t *shadow_pud = get_shadow_table(pud);
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pmd_t *shadow_pmd = get_shadow_table(pmd);
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if (shadow_pud && shadow_pmd)
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pud_populate_kernel(mm, shadow_pud, shadow_pmd);
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pud_populate_kernel(mm, pud, pmd);
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}
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#endif /* __s390x__ */
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static inline pgd_t *pgd_alloc(struct mm_struct *mm)
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{
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unsigned long *crst = crst_table_alloc(mm, s390_noexec);
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if (crst)
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crst_table_init(crst, pgd_entry_type(mm));
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return (pgd_t *) crst;
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}
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#define pgd_free(mm, pgd) crst_table_free((unsigned long *) pgd)
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static inline void
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pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, pte_t *pte)
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{
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#ifndef __s390x__
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pmd_val(pmd[0]) = _SEGMENT_ENTRY + __pa(pte);
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pmd_val(pmd[1]) = _SEGMENT_ENTRY + __pa(pte+256);
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pmd_val(pmd[2]) = _SEGMENT_ENTRY + __pa(pte+512);
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pmd_val(pmd[3]) = _SEGMENT_ENTRY + __pa(pte+768);
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#else /* __s390x__ */
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pmd_val(*pmd) = _SEGMENT_ENTRY + __pa(pte);
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pmd_val1(*pmd) = _SEGMENT_ENTRY + __pa(pte+256);
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#endif /* __s390x__ */
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}
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static inline void
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pmd_populate(struct mm_struct *mm, pmd_t *pmd, struct page *page)
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{
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pte_t *pte = (pte_t *)page_to_phys(page);
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pmd_t *shadow_pmd = get_shadow_table(pmd);
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pte_t *shadow_pte = get_shadow_pte(pte);
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pmd_populate_kernel(mm, pmd, pte);
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if (shadow_pmd && shadow_pte)
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pmd_populate_kernel(mm, shadow_pmd, shadow_pte);
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}
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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, vmaddr) \
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((pte_t *) page_table_alloc(s390_noexec))
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#define pte_alloc_one(mm, vmaddr) \
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virt_to_page(page_table_alloc(s390_noexec))
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#define pte_free_kernel(mm, pte) \
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page_table_free((unsigned long *) pte)
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#define pte_free(mm, pte) \
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page_table_free((unsigned long *) page_to_phys((struct page *) pte))
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#endif /* _S390_PGALLOC_H */
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