115 lines
2.1 KiB
C
115 lines
2.1 KiB
C
/*
|
|
* arch/sh/mm/hugetlbpage.c
|
|
*
|
|
* SuperH HugeTLB page support.
|
|
*
|
|
* Cloned from sparc64 by Paul Mundt.
|
|
*
|
|
* Copyright (C) 2002, 2003 David S. Miller (davem@redhat.com)
|
|
*/
|
|
|
|
#include <linux/config.h>
|
|
#include <linux/init.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/hugetlb.h>
|
|
#include <linux/pagemap.h>
|
|
#include <linux/smp_lock.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/sysctl.h>
|
|
|
|
#include <asm/mman.h>
|
|
#include <asm/pgalloc.h>
|
|
#include <asm/tlb.h>
|
|
#include <asm/tlbflush.h>
|
|
#include <asm/cacheflush.h>
|
|
|
|
pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr)
|
|
{
|
|
pgd_t *pgd;
|
|
pmd_t *pmd;
|
|
pte_t *pte = NULL;
|
|
|
|
pgd = pgd_offset(mm, addr);
|
|
if (pgd) {
|
|
pmd = pmd_alloc(mm, pgd, addr);
|
|
if (pmd)
|
|
pte = pte_alloc_map(mm, pmd, addr);
|
|
}
|
|
return pte;
|
|
}
|
|
|
|
pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr)
|
|
{
|
|
pgd_t *pgd;
|
|
pmd_t *pmd;
|
|
pte_t *pte = NULL;
|
|
|
|
pgd = pgd_offset(mm, addr);
|
|
if (pgd) {
|
|
pmd = pmd_offset(pgd, addr);
|
|
if (pmd)
|
|
pte = pte_offset_map(pmd, addr);
|
|
}
|
|
return pte;
|
|
}
|
|
|
|
void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
|
|
pte_t *ptep, pte_t entry)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < (1 << HUGETLB_PAGE_ORDER); i++) {
|
|
set_pte_at(mm, addr, ptep, entry);
|
|
ptep++;
|
|
addr += PAGE_SIZE;
|
|
pte_val(entry) += PAGE_SIZE;
|
|
}
|
|
}
|
|
|
|
pte_t huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
|
|
pte_t *ptep)
|
|
{
|
|
pte_t entry;
|
|
int i;
|
|
|
|
entry = *ptep;
|
|
|
|
for (i = 0; i < (1 << HUGETLB_PAGE_ORDER); i++) {
|
|
pte_clear(mm, addr, ptep);
|
|
addr += PAGE_SIZE;
|
|
ptep++;
|
|
}
|
|
|
|
return entry;
|
|
}
|
|
|
|
/*
|
|
* This function checks for proper alignment of input addr and len parameters.
|
|
*/
|
|
int is_aligned_hugepage_range(unsigned long addr, unsigned long len)
|
|
{
|
|
if (len & ~HPAGE_MASK)
|
|
return -EINVAL;
|
|
if (addr & ~HPAGE_MASK)
|
|
return -EINVAL;
|
|
return 0;
|
|
}
|
|
|
|
struct page *follow_huge_addr(struct mm_struct *mm,
|
|
unsigned long address, int write)
|
|
{
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
|
|
int pmd_huge(pmd_t pmd)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
|
|
pmd_t *pmd, int write)
|
|
{
|
|
return NULL;
|
|
}
|