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/*
* linux/include/asm-arm/pgalloc.h
*/
#ifndef _ASMARM_PGALLOC_H
#define _ASMARM_PGALLOC_H
#include <linux/config.h>
#include <linux/threads.h>
#include <asm/processor.h>
/*
* Get the cache handling stuff now.
*/
#include <asm/proc/cache.h>
extern __inline__ void flush_tlb_pgtables(struct mm_struct *mm,
unsigned long start,
unsigned long end)
{
}
/*
* Page table cache stuff
*/
#ifndef CONFIG_NO_PGT_CACHE
#ifdef __SMP__
#error Pgtable caches have to be per-CPU, so that no locking is needed.
#endif /* __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)
/* used for quicklists */
#define __pgd_next(pgd) (((unsigned long *)pgd)[1])
#define __pte_next(pte) (((unsigned long *)pte)[0])
extern __inline__ pgd_t *get_pgd_fast(void)
{
unsigned long *ret;
if ((ret = pgd_quicklist) != NULL) {
pgd_quicklist = (unsigned long *)__pgd_next(ret);
ret[1] = ret[2];
clean_cache_area(ret + 1, 4);
pgtable_cache_size--;
}
return (pgd_t *)ret;
}
extern __inline__ void free_pgd_fast(pgd_t *pgd)
{
__pgd_next(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 */
#define get_pmd_fast() ((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 = pte_quicklist) != NULL) {
pte_quicklist = (unsigned long *)__pte_next(ret);
ret[0] = ret[1];
clean_cache_area(ret, 4);
pgtable_cache_size--;
}
return (pte_t *)ret;
}
extern __inline__ void free_pte_fast(pte_t *pte)
{
__pte_next(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 */
extern pgd_t *get_pgd_slow(void);
extern void free_pgd_slow(pgd_t *pgd);
#define free_pmd_slow(pmd) do { } while (0)
extern pte_t *get_pte_kernel_slow(pmd_t *pmd, unsigned long addr_preadjusted);
extern pte_t *get_pte_slow(pmd_t *pmd, unsigned long addr_preadjusted);
extern void free_pte_slow(pte_t *pte);
/*
* 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_fast(pte)
#define pte_free(pte) free_pte_fast(pte)
#ifndef pte_alloc_kernel
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 = (pte_t *) get_pte_fast();
if (!page)
return get_pte_kernel_slow(pmd, address);
set_pmd(pmd, mk_kernel_pmd(page));
return page + address;
}
if (pmd_bad(*pmd)) {
__handle_bad_pmd_kernel(pmd);
return NULL;
}
return (pte_t *) pmd_page(*pmd) + address;
}
#endif
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 = (pte_t *) get_pte_fast();
if (!page)
return get_pte_slow(pmd, address);
set_pmd(pmd, mk_user_pmd(page));
return page + address;
}
if (pmd_bad(*pmd)) {
__handle_bad_pmd(pmd);
return NULL;
}
return (pte_t *) pmd_page(*pmd) + address;
}
#define pmd_free_kernel pmd_free
#define pmd_free(pmd) do { } while (0)
#define pmd_alloc_kernel pmd_alloc
extern __inline__ pmd_t *pmd_alloc(pgd_t *pgd, unsigned long address)
{
return (pmd_t *) pgd;
}
#define pgd_free(pgd) free_pgd_fast(pgd)
extern __inline__ pgd_t *pgd_alloc(void)
{
pgd_t *pgd;
pgd = get_pgd_fast();
if (!pgd)
pgd = get_pgd_slow();
return pgd;
}
extern int do_check_pgt_cache(int, int);
extern __inline__ void set_pgdir(unsigned long address, pgd_t entry)
{
struct task_struct * p;
read_lock(&tasklist_lock);
for_each_task(p) {
if (!p->mm)
continue;
*pgd_offset(p->mm,address) = entry;
}
read_unlock(&tasklist_lock);
#ifndef CONFIG_NO_PGT_CACHE
{
pgd_t *pgd;
for (pgd = (pgd_t *)pgd_quicklist; pgd;
pgd = (pgd_t *)__pgd_next(pgd))
pgd[address >> PGDIR_SHIFT] = entry;
}
#endif
}
#endif
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