102 lines
2.1 KiB
C
102 lines
2.1 KiB
C
/*
|
|
* MIPS Huge TLB Page Support for Kernel.
|
|
*
|
|
* 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.
|
|
*
|
|
* Copyright (C) 2002, Rohit Seth <rohit.seth@intel.com>
|
|
* Copyright 2005, Embedded Alley Solutions, Inc.
|
|
* Matt Porter <mporter@embeddedalley.com>
|
|
* Copyright (C) 2008, 2009 Cavium Networks, Inc.
|
|
*/
|
|
|
|
#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/err.h>
|
|
#include <linux/sysctl.h>
|
|
#include <asm/mman.h>
|
|
#include <asm/tlb.h>
|
|
#include <asm/tlbflush.h>
|
|
|
|
pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr,
|
|
unsigned long sz)
|
|
{
|
|
pgd_t *pgd;
|
|
pud_t *pud;
|
|
pte_t *pte = NULL;
|
|
|
|
pgd = pgd_offset(mm, addr);
|
|
pud = pud_alloc(mm, pgd, addr);
|
|
if (pud)
|
|
pte = (pte_t *)pmd_alloc(mm, pud, addr);
|
|
|
|
return pte;
|
|
}
|
|
|
|
pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr)
|
|
{
|
|
pgd_t *pgd;
|
|
pud_t *pud;
|
|
pmd_t *pmd = NULL;
|
|
|
|
pgd = pgd_offset(mm, addr);
|
|
if (pgd_present(*pgd)) {
|
|
pud = pud_offset(pgd, addr);
|
|
if (pud_present(*pud))
|
|
pmd = pmd_offset(pud, addr);
|
|
}
|
|
return (pte_t *) pmd;
|
|
}
|
|
|
|
int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* 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 (pmd_val(pmd) & _PAGE_HUGE) != 0;
|
|
}
|
|
|
|
int pud_huge(pud_t pud)
|
|
{
|
|
return (pud_val(pud) & _PAGE_HUGE) != 0;
|
|
}
|
|
|
|
struct page *
|
|
follow_huge_pmd(struct mm_struct *mm, unsigned long address,
|
|
pmd_t *pmd, int write)
|
|
{
|
|
struct page *page;
|
|
|
|
page = pte_page(*(pte_t *)pmd);
|
|
if (page)
|
|
page += ((address & ~HPAGE_MASK) >> PAGE_SHIFT);
|
|
return page;
|
|
}
|
|
|