196 lines
4.6 KiB
C
196 lines
4.6 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/threads.h>
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#include <linux/mm.h>
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#define pgd_quicklist (current_cpu_data.pgd_quick)
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#define pmd_quicklist (current_cpu_data.pmd_quick)
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#define pte_quicklist (current_cpu_data.pte_quick)
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#define pgtable_cache_size (current_cpu_data.pgtable_cache_sz)
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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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extern __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 = (pgd_t *)kmalloc(pgd_size, GFP_KERNEL);
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return ret;
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}
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extern __inline__ pgd_t *get_pgd_fast(void)
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{
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unsigned long *ret;
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if ((ret = pgd_quicklist) != NULL) {
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pgd_quicklist = (unsigned long *)(*ret);
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ret[0] = 0;
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pgtable_cache_size--;
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} else
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ret = (unsigned long *)get_pgd_slow();
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if (ret) {
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memset(ret, 0, USER_PTRS_PER_PGD * sizeof(pgd_t));
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}
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return (pgd_t *)ret;
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}
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extern __inline__ void free_pgd_fast(pgd_t *pgd)
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{
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*(unsigned long *)pgd = (unsigned long) pgd_quicklist;
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pgd_quicklist = (unsigned long *) pgd;
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pgtable_cache_size++;
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}
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extern __inline__ void free_pgd_slow(pgd_t *pgd)
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{
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kfree((void *)pgd);
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}
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extern pte_t *get_pte_slow(pmd_t *pmd, unsigned long address_preadjusted);
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extern pte_t *get_pte_kernel_slow(pmd_t *pmd, unsigned long address_preadjusted);
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extern __inline__ pte_t *get_pte_fast(void)
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{
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unsigned long *ret;
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if((ret = (unsigned long *)pte_quicklist) != NULL) {
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pte_quicklist = (unsigned long *)(*ret);
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ret[0] = ret[1];
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pgtable_cache_size--;
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}
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return (pte_t *)ret;
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}
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extern __inline__ void free_pte_fast(pte_t *pte)
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{
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*(unsigned long *)pte = (unsigned long) pte_quicklist;
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pte_quicklist = (unsigned long *) pte;
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pgtable_cache_size++;
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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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free_page((unsigned long)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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__free_page(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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pte_t *pte;
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pte = (pte_t *)__get_free_page(GFP_KERNEL | __GFP_REPEAT|__GFP_ZERO);
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return pte;
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}
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static inline struct page *pte_alloc_one(struct mm_struct *mm, unsigned long address)
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{
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struct page *pte;
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pte = alloc_pages(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO, 0);
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return pte;
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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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pmd_t *pmd;
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pmd = (pmd_t *) __get_free_page(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO);
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return pmd;
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}
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static __inline__ void pmd_free(pmd_t *pmd)
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{
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free_page((unsigned long) 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 check_pgt_cache() do { } while (0)
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#define pgd_free(pgd) free_pgd_slow(pgd)
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#define pgd_alloc(mm) get_pgd_fast()
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extern int do_check_pgt_cache(int, int);
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extern inline void set_pgdir(unsigned long address, pgd_t entry)
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{
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struct task_struct * p;
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pgd_t *pgd;
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read_lock(&tasklist_lock);
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for_each_process(p) {
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if (!p->mm)
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continue;
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*pgd_offset(p->mm,address) = entry;
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}
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read_unlock(&tasklist_lock);
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for (pgd = (pgd_t *)pgd_quicklist; pgd; pgd = (pgd_t *)*(unsigned long *)pgd)
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pgd[address >> PGDIR_SHIFT] = entry;
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}
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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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#endif /* __ASM_SH64_PGALLOC_H */
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