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126 lines
2.9 KiB
C
126 lines
2.9 KiB
C
#ifndef __ASM_SH64_PGALLOC_H
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#define __ASM_SH64_PGALLOC_H
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/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* include/asm-sh64/pgalloc.h
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*
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* Copyright (C) 2000, 2001 Paolo Alberelli
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* Copyright (C) 2003, 2004 Paul Mundt
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* Copyright (C) 2003, 2004 Richard Curnow
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*
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*/
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#include <linux/mm.h>
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#include <linux/quicklist.h>
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#include <asm/page.h>
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static inline void pgd_init(unsigned long page)
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{
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unsigned long *pgd = (unsigned long *)page;
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extern pte_t empty_bad_pte_table[PTRS_PER_PTE];
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int i;
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for (i = 0; i < USER_PTRS_PER_PGD; i++)
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pgd[i] = (unsigned long)empty_bad_pte_table;
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}
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/*
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* Allocate and free page tables. The xxx_kernel() versions are
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* used to allocate a kernel page table - this turns on ASN bits
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* if any.
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*/
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static inline pgd_t *get_pgd_slow(void)
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{
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unsigned int pgd_size = (USER_PTRS_PER_PGD * sizeof(pgd_t));
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pgd_t *ret = kmalloc(pgd_size, GFP_KERNEL);
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return ret;
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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 quicklist_alloc(0, GFP_KERNEL, NULL);
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}
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static inline void pgd_free(pgd_t *pgd)
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{
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quicklist_free(0, NULL, pgd);
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}
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static inline struct page *pte_alloc_one(struct mm_struct *mm,
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unsigned long address)
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{
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void *pg = quicklist_alloc(0, GFP_KERNEL, NULL);
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return pg ? virt_to_page(pg) : NULL;
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}
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static inline void pte_free_kernel(pte_t *pte)
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{
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quicklist_free(0, NULL, pte);
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}
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static inline void pte_free(struct page *pte)
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{
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quicklist_free_page(0, NULL, pte);
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}
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static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
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unsigned long address)
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{
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return quicklist_alloc(0, GFP_KERNEL, NULL);
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}
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#define __pte_free_tlb(tlb,pte) tlb_remove_page((tlb),(pte))
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/*
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* allocating and freeing a pmd is trivial: the 1-entry pmd is
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* inside the pgd, so has no extra memory associated with it.
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*/
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#if defined(CONFIG_SH64_PGTABLE_2_LEVEL)
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#define pmd_alloc_one(mm, addr) ({ BUG(); ((pmd_t *)2); })
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#define pmd_free(x) do { } while (0)
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#define pgd_populate(mm, pmd, pte) BUG()
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#define __pte_free_tlb(tlb,pte) tlb_remove_page((tlb),(pte))
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#define __pmd_free_tlb(tlb,pmd) do { } while (0)
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#elif defined(CONFIG_SH64_PGTABLE_3_LEVEL)
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static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
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{
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return quicklist_alloc(0, GFP_KERNEL, NULL);
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}
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static inline void pmd_free(pmd_t *pmd)
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{
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quicklist_free(0, NULL, pmd);
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}
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#define pgd_populate(mm, pgd, pmd) pgd_set(pgd, pmd)
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#define __pmd_free_tlb(tlb,pmd) pmd_free(pmd)
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#else
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#error "No defined page table size"
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#endif
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#define pmd_populate_kernel(mm, pmd, pte) \
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set_pmd(pmd, __pmd(_PAGE_TABLE + (unsigned long) (pte)))
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static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
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struct page *pte)
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{
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set_pmd(pmd, __pmd(_PAGE_TABLE + (unsigned long) page_address (pte)));
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}
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static inline void check_pgt_cache(void)
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{
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quicklist_trim(0, NULL, 25, 16);
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}
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#endif /* __ASM_SH64_PGALLOC_H */
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