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#ifndef _CRIS_PGALLOC_H
#define _CRIS_PGALLOC_H
#include <linux/config.h>
#include <asm/page.h>
#include <linux/threads.h>
/* bunch of protos */
extern pgd_t *get_pgd_slow(void);
extern void free_pgd_slow(pgd_t *pgd);
extern __inline__ void free_pmd_slow(pmd_t *pmd) { }
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);
/* first the non-cached versions */
extern __inline__ void free_pte_slow(pte_t *pte)
{
free_page((unsigned long)pte);
}
extern __inline__ pgd_t *get_pgd_slow(void)
{
pgd_t *ret = (pgd_t *)__get_free_page(GFP_KERNEL);
if (ret) {
memset(ret, 0, USER_PTRS_PER_PGD * sizeof(pgd_t));
memcpy(ret + USER_PTRS_PER_PGD, swapper_pg_dir + USER_PTRS_PER_PGD,
(PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
}
return ret;
}
extern __inline__ void free_pgd_slow(pgd_t *pgd)
{
free_page((unsigned long)pgd);
}
/*
* Now for the page table cache versions
*/
#ifndef CONFIG_NO_PGT_CACHE
#ifdef CONFIG_SMP
#error Pgtable caches have to be per-CPU, so that no locking is needed.
#endif /* CONFIG_SMP */
extern struct pgtable_cache_struct {
unsigned long *pgd_cache;
unsigned long *pte_cache;
unsigned long pgtable_cache_sz;
} quicklists;
#define pgd_quicklist (quicklists.pgd_cache)
#define pmd_quicklist ((unsigned long *)0)
#define pte_quicklist (quicklists.pte_cache)
#define pgtable_cache_size (quicklists.pgtable_cache_sz)
extern __inline__ pgd_t *get_pgd_fast(void)
{
unsigned long *ret;
if ((ret = pgd_quicklist) != NULL) {
pgd_quicklist = (unsigned long *)(*ret);
ret[0] = 0;
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++;
}
/* We don't use pmd cache, so this is a dummy routine */
extern __inline__ pmd_t *get_pmd_fast(void)
{
return (pmd_t *)0;
}
extern __inline__ void free_pmd_fast(pmd_t *pmd) { }
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++;
}
#else /* CONFIG_NO_PGT_CACHE */
#define pgd_quicklist ((unsigned long *)0)
#define pmd_quicklist ((unsigned long *)0)
#define pte_quicklist ((unsigned long *)0)
#define get_pgd_fast() ((pgd_t *)0)
#define get_pmd_fast() ((pmd_t *)0)
#define get_pte_fast() ((pte_t *)0)
#define free_pgd_fast(pgd) free_pgd_slow(pgd)
#define free_pmd_fast(pmd) free_pmd_slow(pmd)
#define free_pte_fast(pte) free_pte_slow(pte)
#endif /* CONFIG_NO_PGT_CACHE */
/*
* 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 pte_free_kernel(pte) free_pte_slow(pte)
#define pte_free(pte) free_pte_slow(pte)
extern inline pte_t * pte_alloc_kernel(pmd_t * pmd, unsigned long address)
{
if (!pmd)
BUG();
address = (address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1);
if (pmd_none(*pmd)) {
pte_t * page = (pte_t *) get_pte_fast();
if (!page)
return get_pte_kernel_slow(pmd, address);
pmd_set_kernel(pmd, page);
return page + address;
}
if (pmd_bad(*pmd)) {
__handle_bad_pmd_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))
goto getnew;
if (pmd_bad(*pmd))
goto fix;
return (pte_t *)pmd_page(*pmd) + address;
getnew:
{
pte_t * page = (pte_t *) get_pte_fast();
if (!page)
return get_pte_slow(pmd, address);
pmd_set(pmd, page);
return page + address;
}
fix:
__handle_bad_pmd(pmd);
return NULL;
}
/*
* allocating and freeing a pmd is trivial: the 1-entry pmd is
* inside the pgd, so has no extra memory associated with it.
*/
#define pmd_free(pmd) free_pmd_slow(pmd)
#define pmd_free_kernel pmd_free
#define pmd_alloc_kernel pmd_alloc
extern inline pmd_t * pmd_alloc(pgd_t *pgd, unsigned long address)
{
if (!pgd)
BUG();
return (pmd_t *) pgd;
}
/* pgd handling */
#define pgd_free(pgd) free_pgd_slow(pgd)
#define pgd_alloc() get_pgd_fast()
/* other stuff */
extern int do_check_pgt_cache(int, int);
#endif
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