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#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/mm.h>
#include <linux/quicklist.h>
#include <asm/page.h>
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.
*/
static inline pgd_t *get_pgd_slow(void)
{
unsigned int pgd_size = (USER_PTRS_PER_PGD * sizeof(pgd_t));
pgd_t *ret = kmalloc(pgd_size, GFP_KERNEL);
return ret;
}
static inline pgd_t *pgd_alloc(struct mm_struct *mm)
{
return quicklist_alloc(0, GFP_KERNEL, NULL);
}
static inline void pgd_free(pgd_t *pgd)
{
quicklist_free(0, NULL, pgd);
}
static inline struct page *pte_alloc_one(struct mm_struct *mm,
unsigned long address)
{
void *pg = quicklist_alloc(0, GFP_KERNEL, NULL);
return pg ? virt_to_page(pg) : NULL;
}
static inline void pte_free_kernel(pte_t *pte)
{
quicklist_free(0, NULL, pte);
}
static inline void pte_free(struct page *pte)
{
quicklist_free_page(0, NULL, pte);
}
static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
unsigned long address)
{
return quicklist_alloc(0, GFP_KERNEL, NULL);
}
#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)
{
return quicklist_alloc(0, GFP_KERNEL, NULL);
}
static inline void pmd_free(pmd_t *pmd)
{
quicklist_free(0, NULL, 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 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)));
}
static inline void check_pgt_cache(void)
{
quicklist_trim(0, NULL, 25, 16);
}
#endif /* __ASM_SH64_PGALLOC_H */
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