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/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 1994 - 2001 by Ralf Baechle at alii
* Copyright (C) 1999, 2000, 2001 Silicon Graphics, Inc.
*/
#ifndef _ASM_PGALLOC_H
#define _ASM_PGALLOC_H
#include <linux/config.h>
/* TLB flushing:
*
* - flush_tlb_all() flushes all processes TLB entries
* - flush_tlb_mm(mm) flushes the specified mm context TLB entries
* - flush_tlb_page(mm, vmaddr) flushes a single page
* - flush_tlb_range(mm, start, end) flushes a range of pages
* - flush_tlb_pgtables(mm, start, end) flushes a range of page tables
*/
extern void (*_flush_tlb_all)(void);
extern void (*_flush_tlb_mm)(struct mm_struct *mm);
extern void (*_flush_tlb_range)(struct mm_struct *mm, unsigned long start,
unsigned long end);
extern void (*_flush_tlb_page)(struct vm_area_struct *vma, unsigned long page);
#ifndef CONFIG_SMP
#define flush_tlb_all() _flush_tlb_all()
#define flush_tlb_mm(mm) _flush_tlb_mm(mm)
#define flush_tlb_range(mm,vmaddr,end) _flush_tlb_range(mm, vmaddr, end)
#define flush_tlb_page(vma,page) _flush_tlb_page(vma, page)
#else /* CONFIG_SMP */
extern void flush_tlb_all(void);
extern void flush_tlb_mm(struct mm_struct *);
extern void flush_tlb_range(struct mm_struct *, unsigned long, unsigned long);
extern void flush_tlb_page(struct vm_area_struct *, unsigned long);
#endif /* CONFIG_SMP */
extern inline void flush_tlb_pgtables(struct mm_struct *mm,
unsigned long start, unsigned long end)
{
/* Nothing to do on MIPS. */
}
/*
* Allocate and free page tables.
*/
#define pgd_quicklist (current_cpu_data.pgd_quick)
#define pmd_quicklist (current_cpu_data.pmd_quick)
#define pte_quicklist (current_cpu_data.pte_quick)
#define pgtable_cache_size (current_cpu_data.pgtable_cache_sz)
#define pmd_populate(mm, pmd, pte) pmd_set(pmd, pte)
#define pgd_populate(mm, pgd, pmd) pgd_set(pgd, pmd)
extern pgd_t *get_pgd_slow(void);
extern inline pgd_t *get_pgd_fast(void)
{
unsigned long *ret;
if((ret = pgd_quicklist) != NULL) {
pgd_quicklist = (unsigned long *)(*ret);
ret[0] = ret[1];
pgtable_cache_size--;
return (pgd_t *)ret;
}
ret = (unsigned long *) get_pgd_slow();
return (pgd_t *)ret;
}
extern inline void free_pgd_fast(pgd_t *pgd)
{
*(unsigned long *)pgd = (unsigned long) pgd_quicklist;
pgd_quicklist = (unsigned long *) pgd;
pgtable_cache_size++;
}
extern inline void free_pgd_slow(pgd_t *pgd)
{
free_pages((unsigned long)pgd, 1);
}
static inline pte_t *pte_alloc_one(struct mm_struct *mm, unsigned long address)
{
pte_t *pte;
pte = (pte_t *) __get_free_page(GFP_KERNEL);
if (pte)
clear_page(pte);
return pte;
}
static inline pte_t *pte_alloc_one_fast(struct mm_struct *mm, unsigned long address)
{
unsigned long *ret;
if ((ret = (unsigned long *)pte_quicklist) != NULL) {
pte_quicklist = (unsigned long *)(*ret);
ret[0] = ret[1];
pgtable_cache_size--;
}
return (pte_t *)ret;
}
extern pte_t *get_pte_slow(pmd_t *pmd, unsigned long address_preadjusted);
extern inline pte_t *get_pte_fast(void)
{
unsigned long *ret;
if((ret = (unsigned long *)pte_quicklist) != NULL) {
pte_quicklist = (unsigned long *)(*ret);
ret[0] = ret[1];
pgtable_cache_size--;
}
return (pte_t *)ret;
}
extern inline void free_pte_fast(pte_t *pte)
{
*(unsigned long *)pte = (unsigned long) pte_quicklist;
pte_quicklist = (unsigned long *) pte;
pgtable_cache_size++;
}
extern inline void free_pte_slow(pte_t *pte)
{
free_pages((unsigned long)pte, 0);
}
static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
{
pmd_t *pmd;
pmd = (pmd_t *) __get_free_pages(GFP_KERNEL, 1);
if (pmd)
pmd_init((unsigned long)pmd, (unsigned long)invalid_pte_table);
return pmd;
}
static inline pmd_t *pmd_alloc_one_fast(struct mm_struct *mm, unsigned long address)
{
unsigned long *ret;
if ((ret = (unsigned long *)pmd_quicklist) != NULL) {
pmd_quicklist = (unsigned long *)(*ret);
ret[0] = ret[1];
pgtable_cache_size--;
}
return (pmd_t *)ret;
}
extern pmd_t *get_pmd_slow(pgd_t *pgd, unsigned long address_preadjusted);
extern inline pmd_t *get_pmd_fast(void)
{
unsigned long *ret;
if ((ret = (unsigned long *)pmd_quicklist) != NULL) {
pmd_quicklist = (unsigned long *)(*ret);
ret[0] = ret[1];
pgtable_cache_size--;
return (pmd_t *)ret;
}
return (pmd_t *)ret;
}
extern inline void free_pmd_fast(pmd_t *pmd)
{
*(unsigned long *)pmd = (unsigned long) pmd_quicklist;
pmd_quicklist = (unsigned long *) pmd;
pgtable_cache_size++;
}
extern inline void free_pmd_slow(pmd_t *pmd)
{
free_pages((unsigned long)pmd, 1);
}
#define pte_free(pte) free_pte_fast(pte)
#define pmd_free(pte) free_pmd_fast(pte)
#define pgd_free(pgd) free_pgd_fast(pgd)
#define pgd_alloc(mm) get_pgd_fast()
extern pte_t kptbl[(PAGE_SIZE<<KPTBL_PAGE_ORDER)/sizeof(pte_t)];
extern pmd_t kpmdtbl[PTRS_PER_PMD];
extern int do_check_pgt_cache(int, int);
#endif /* _ASM_PGALLOC_H */
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