mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-23 02:54:32 +08:00
1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
196 lines
4.6 KiB
C
196 lines
4.6 KiB
C
#ifndef __ASM_SH64_PGALLOC_H
|
|
#define __ASM_SH64_PGALLOC_H
|
|
|
|
/*
|
|
* 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.
|
|
*
|
|
* include/asm-sh64/pgalloc.h
|
|
*
|
|
* Copyright (C) 2000, 2001 Paolo Alberelli
|
|
* Copyright (C) 2003, 2004 Paul Mundt
|
|
* Copyright (C) 2003, 2004 Richard Curnow
|
|
*
|
|
*/
|
|
|
|
#include <linux/threads.h>
|
|
#include <linux/mm.h>
|
|
|
|
#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)
|
|
|
|
static inline void pgd_init(unsigned long page)
|
|
{
|
|
unsigned long *pgd = (unsigned long *)page;
|
|
extern pte_t empty_bad_pte_table[PTRS_PER_PTE];
|
|
int i;
|
|
|
|
for (i = 0; i < USER_PTRS_PER_PGD; i++)
|
|
pgd[i] = (unsigned long)empty_bad_pte_table;
|
|
}
|
|
|
|
/*
|
|
* Allocate and free page tables. The xxx_kernel() versions are
|
|
* used to allocate a kernel page table - this turns on ASN bits
|
|
* if any.
|
|
*/
|
|
|
|
extern __inline__ pgd_t *get_pgd_slow(void)
|
|
{
|
|
unsigned int pgd_size = (USER_PTRS_PER_PGD * sizeof(pgd_t));
|
|
pgd_t *ret = (pgd_t *)kmalloc(pgd_size, GFP_KERNEL);
|
|
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] = 0;
|
|
pgtable_cache_size--;
|
|
} else
|
|
ret = (unsigned long *)get_pgd_slow();
|
|
|
|
if (ret) {
|
|
memset(ret, 0, USER_PTRS_PER_PGD * sizeof(pgd_t));
|
|
}
|
|
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)
|
|
{
|
|
kfree((void *)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++;
|
|
}
|
|
|
|
static inline void pte_free_kernel(pte_t *pte)
|
|
{
|
|
free_page((unsigned long)pte);
|
|
}
|
|
|
|
static inline void pte_free(struct page *pte)
|
|
{
|
|
__free_page(pte);
|
|
}
|
|
|
|
static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
|
|
unsigned long address)
|
|
{
|
|
pte_t *pte;
|
|
|
|
pte = (pte_t *)__get_free_page(GFP_KERNEL | __GFP_REPEAT|__GFP_ZERO);
|
|
|
|
return pte;
|
|
}
|
|
|
|
static inline struct page *pte_alloc_one(struct mm_struct *mm, unsigned long address)
|
|
{
|
|
struct page *pte;
|
|
|
|
pte = alloc_pages(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO, 0);
|
|
|
|
return pte;
|
|
}
|
|
|
|
#define __pte_free_tlb(tlb,pte) tlb_remove_page((tlb),(pte))
|
|
|
|
/*
|
|
* allocating and freeing a pmd is trivial: the 1-entry pmd is
|
|
* inside the pgd, so has no extra memory associated with it.
|
|
*/
|
|
|
|
#if defined(CONFIG_SH64_PGTABLE_2_LEVEL)
|
|
|
|
#define pmd_alloc_one(mm, addr) ({ BUG(); ((pmd_t *)2); })
|
|
#define pmd_free(x) do { } while (0)
|
|
#define pgd_populate(mm, pmd, pte) BUG()
|
|
#define __pte_free_tlb(tlb,pte) tlb_remove_page((tlb),(pte))
|
|
#define __pmd_free_tlb(tlb,pmd) do { } while (0)
|
|
|
|
#elif defined(CONFIG_SH64_PGTABLE_3_LEVEL)
|
|
|
|
static __inline__ pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
|
|
{
|
|
pmd_t *pmd;
|
|
pmd = (pmd_t *) __get_free_page(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO);
|
|
return pmd;
|
|
}
|
|
|
|
static __inline__ void pmd_free(pmd_t *pmd)
|
|
{
|
|
free_page((unsigned long) pmd);
|
|
}
|
|
|
|
#define pgd_populate(mm, pgd, pmd) pgd_set(pgd, pmd)
|
|
#define __pmd_free_tlb(tlb,pmd) pmd_free(pmd)
|
|
|
|
#else
|
|
#error "No defined page table size"
|
|
#endif
|
|
|
|
#define check_pgt_cache() do { } while (0)
|
|
#define pgd_free(pgd) free_pgd_slow(pgd)
|
|
#define pgd_alloc(mm) get_pgd_fast()
|
|
|
|
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;
|
|
|
|
read_lock(&tasklist_lock);
|
|
for_each_process(p) {
|
|
if (!p->mm)
|
|
continue;
|
|
*pgd_offset(p->mm,address) = entry;
|
|
}
|
|
read_unlock(&tasklist_lock);
|
|
for (pgd = (pgd_t *)pgd_quicklist; pgd; pgd = (pgd_t *)*(unsigned long *)pgd)
|
|
pgd[address >> PGDIR_SHIFT] = entry;
|
|
}
|
|
|
|
#define pmd_populate_kernel(mm, pmd, pte) \
|
|
set_pmd(pmd, __pmd(_PAGE_TABLE + (unsigned long) (pte)))
|
|
|
|
static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
|
|
struct page *pte)
|
|
{
|
|
set_pmd(pmd, __pmd(_PAGE_TABLE + (unsigned long) page_address (pte)));
|
|
}
|
|
|
|
#endif /* __ASM_SH64_PGALLOC_H */
|