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/* $Id: pgalloc.h,v 1.3 2000/02/23 00:41:38 ralf Exp $
*
* 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 - 2000 by Ralf Baechle at alii
* Copyright (C) 1999, 2000 Silicon Graphics, Inc.
*/
#ifndef _ASM_PGALLOC_H
#define _ASM_PGALLOC_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
*/
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);
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. The xxx_kernel() versions are
* used to allocate a kernel page table - this turns on ASN bits
* if any.
*/
#define pgd_quicklist (current_cpu_data.pgd_quick)
#define pmd_quicklist ((unsigned long *)0)
#define pte_quicklist (current_cpu_data.pte_quick)
#define pgtable_cache_size (current_cpu_data.pgtable_cache_sz)
extern __inline__ pgd_t *get_pgd_slow(void)
{
pgd_t *ret = (pgd_t *)__get_free_page(GFP_KERNEL), *init;
if (ret) {
init = pgd_offset(&init_mm, 0);
pgd_init((unsigned long)ret);
memcpy (ret + USER_PTRS_PER_PGD, init + USER_PTRS_PER_PGD,
(PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
}
return ret;
}
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--;
} else
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_page((unsigned long)pgd);
}
extern pte_t *get_pte_slow(pmd_t *pmd, unsigned long address_preadjusted);
extern pte_t *get_pte_kernel_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_page((unsigned long)pte);
}
/* We don't use pmd cache, so these are dummy routines */
extern __inline__ pmd_t *get_pmd_fast(void)
{
return (pmd_t *)0;
}
extern __inline__ void free_pmd_fast(pmd_t *pmd)
{
}
extern __inline__ void free_pmd_slow(pmd_t *pmd)
{
}
extern void __bad_pte(pmd_t *pmd);
extern void __bad_pte_kernel(pmd_t *pmd);
#define pte_free_kernel(pte) free_pte_fast(pte)
#define pte_free(pte) free_pte_fast(pte)
#define pgd_free(pgd) free_pgd_fast(pgd)
#define pgd_alloc() get_pgd_fast()
extern inline pte_t * pte_alloc_kernel(pmd_t * pmd, unsigned long address)
{
address = (address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1);
if (pmd_none(*pmd)) {
pte_t *page = get_pte_fast();
if (page) {
pmd_val(*pmd) = (unsigned long)page;
return page + address;
}
return get_pte_kernel_slow(pmd, address);
}
if (pmd_bad(*pmd)) {
__bad_pte_kernel(pmd);
return NULL;
}
return (pte_t *) pmd_page(*pmd) + address;
}
extern inline pte_t * pte_alloc(pmd_t * pmd, unsigned long address)
{
address = (address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1);
if (pmd_none(*pmd)) {
pte_t *page = get_pte_fast();
if (page) {
pmd_val(*pmd) = (unsigned long)page;
return page + address;
}
return get_pte_slow(pmd, address);
}
if (pmd_bad(*pmd)) {
__bad_pte(pmd);
return NULL;
}
return (pte_t *) pmd_page(*pmd) + address;
}
/*
* allocating and freeing a pmd is trivial: the 1-entry pmd is
* inside the pgd, so has no extra memory associated with it.
*/
extern inline void pmd_free(pmd_t * pmd)
{
}
extern inline pmd_t * pmd_alloc(pgd_t * pgd, unsigned long address)
{
return (pmd_t *) pgd;
}
#define pmd_free_kernel pmd_free
#define pmd_alloc_kernel pmd_alloc
extern int do_check_pgt_cache(int, int);
extern inline void set_pgdir(unsigned long address, pgd_t entry)
{
struct task_struct * p;
pgd_t *pgd;
#ifdef __SMP__
int i;
#endif
read_lock(&tasklist_lock);
for_each_task(p) {
if (!p->mm)
continue;
*pgd_offset(p->mm,address) = entry;
}
read_unlock(&tasklist_lock);
#ifndef __SMP__
for (pgd = (pgd_t *)pgd_quicklist; pgd; pgd = (pgd_t *)*(unsigned long *)pgd)
pgd[address >> PGDIR_SHIFT] = entry;
#else
/* To pgd_alloc/pgd_free, one holds master kernel lock and so does our
callee, so we can modify pgd caches of other CPUs as well. -jj */
for (i = 0; i < NR_CPUS; i++)
for (pgd = (pgd_t *)cpu_data[i].pgd_quick; pgd; pgd = (pgd_t *)*(unsigned long *)pgd)
pgd[address >> PGDIR_SHIFT] = entry;
#endif
}
#endif /* _ASM_PGALLOC_H */
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