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/*
* Copyright (C) 2011 Tobias Klauser <tklauser@distanz.ch>
* Copyright (C) 2009 Wind River Systems Inc
*
* Based on asm/pgtable-32.h from mips which is:
*
* Copyright (C) 1994, 95, 96, 97, 98, 99, 2000, 2003 Ralf Baechle
* Copyright (C) 1999, 2000, 2001 Silicon Graphics, Inc.
*
* 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.
*/
#ifndef _ASM_NIOS2_PGTABLE_H
#define _ASM_NIOS2_PGTABLE_H
#include <linux/io.h>
#include <linux/bug.h>
#include <asm/page.h>
#include <asm/cacheflush.h>
#include <asm/tlbflush.h>
#include <asm/pgtable-bits.h>
#include <asm-generic/pgtable-nopmd.h>
#define VMALLOC_START CONFIG_NIOS2_KERNEL_MMU_REGION_BASE
#define VMALLOC_END (CONFIG_NIOS2_KERNEL_REGION_BASE - 1)
struct mm_struct;
/* Helper macro */
#define MKP(x, w, r) __pgprot(_PAGE_PRESENT | _PAGE_CACHED | \
((x) ? _PAGE_EXEC : 0) | \
((r) ? _PAGE_READ : 0) | \
((w) ? _PAGE_WRITE : 0))
/*
* These are the macros that generic kernel code needs
* (to populate protection_map[])
*/
/* Remove W bit on private pages for COW support */
/* Shared pages can have exact HW mapping */
/* Used all over the kernel */
#define PAGE_KERNEL __pgprot(_PAGE_PRESENT | _PAGE_CACHED | _PAGE_READ | \
_PAGE_WRITE | _PAGE_EXEC | _PAGE_GLOBAL)
#define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_CACHED | _PAGE_READ | \
_PAGE_WRITE | _PAGE_ACCESSED)
#define PAGE_COPY MKP(0, 0, 1)
#define PTRS_PER_PGD (PAGE_SIZE / sizeof(pgd_t))
#define PTRS_PER_PTE (PAGE_SIZE / sizeof(pte_t))
#define USER_PTRS_PER_PGD \
(CONFIG_NIOS2_KERNEL_MMU_REGION_BASE / PGDIR_SIZE)
#define PGDIR_SHIFT 22
#define PGDIR_SIZE (1UL << PGDIR_SHIFT)
#define PGDIR_MASK (~(PGDIR_SIZE-1))
/*
* ZERO_PAGE is a global shared page that is always zero: used
* for zero-mapped memory areas etc..
*/
extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)];
#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
extern pte_t invalid_pte_table[PAGE_SIZE/sizeof(pte_t)];
/*
* (pmds are folded into puds so this doesn't get actually called,
* but the define is needed for a generic inline function.)
*/
static inline void set_pmd(pmd_t *pmdptr, pmd_t pmdval)
{
*pmdptr = pmdval;
}
static inline int pte_write(pte_t pte) \
{ return pte_val(pte) & _PAGE_WRITE; }
static inline int pte_dirty(pte_t pte) \
{ return pte_val(pte) & _PAGE_DIRTY; }
static inline int pte_young(pte_t pte) \
{ return pte_val(pte) & _PAGE_ACCESSED; }
#define pgprot_noncached pgprot_noncached
static inline pgprot_t pgprot_noncached(pgprot_t _prot)
{
unsigned long prot = pgprot_val(_prot);
prot &= ~_PAGE_CACHED;
return __pgprot(prot);
}
static inline int pte_none(pte_t pte)
{
return !(pte_val(pte) & ~(_PAGE_GLOBAL|0xf));
}
static inline int pte_present(pte_t pte) \
{ return pte_val(pte) & _PAGE_PRESENT; }
/*
* The following only work if pte_present() is true.
* Undefined behaviour if not..
*/
static inline pte_t pte_wrprotect(pte_t pte)
{
pte_val(pte) &= ~_PAGE_WRITE;
return pte;
}
static inline pte_t pte_mkclean(pte_t pte)
{
pte_val(pte) &= ~_PAGE_DIRTY;
return pte;
}
static inline pte_t pte_mkold(pte_t pte)
{
pte_val(pte) &= ~_PAGE_ACCESSED;
return pte;
}
static inline pte_t pte_mkwrite(pte_t pte)
{
pte_val(pte) |= _PAGE_WRITE;
return pte;
}
static inline pte_t pte_mkdirty(pte_t pte)
{
pte_val(pte) |= _PAGE_DIRTY;
return pte;
}
static inline pte_t pte_mkyoung(pte_t pte)
{
pte_val(pte) |= _PAGE_ACCESSED;
return pte;
}
static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
{
const unsigned long mask = _PAGE_READ | _PAGE_WRITE | _PAGE_EXEC;
pte_val(pte) = (pte_val(pte) & ~mask) | (pgprot_val(newprot) & mask);
return pte;
}
static inline int pmd_present(pmd_t pmd)
{
return (pmd_val(pmd) != (unsigned long) invalid_pte_table)
&& (pmd_val(pmd) != 0UL);
}
static inline void pmd_clear(pmd_t *pmdp)
{
pmd_val(*pmdp) = (unsigned long) invalid_pte_table;
}
#define pte_pfn(pte) (pte_val(pte) & 0xfffff)
#define pfn_pte(pfn, prot) (__pte(pfn | pgprot_val(prot)))
#define pte_page(pte) (pfn_to_page(pte_pfn(pte)))
/*
* Store a linux PTE into the linux page table.
*/
static inline void set_pte(pte_t *ptep, pte_t pteval)
{
*ptep = pteval;
}
static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
pte_t *ptep, pte_t pteval)
{
unsigned long paddr = (unsigned long)page_to_virt(pte_page(pteval));
flush_dcache_range(paddr, paddr + PAGE_SIZE);
set_pte(ptep, pteval);
}
static inline int pmd_none(pmd_t pmd)
{
return (pmd_val(pmd) ==
(unsigned long) invalid_pte_table) || (pmd_val(pmd) == 0UL);
}
#define pmd_bad(pmd) (pmd_val(pmd) & ~PAGE_MASK)
static inline void pte_clear(struct mm_struct *mm,
unsigned long addr, pte_t *ptep)
{
pte_t null;
pte_val(null) = (addr >> PAGE_SHIFT) & 0xf;
set_pte_at(mm, addr, ptep, null);
}
/*
* Conversion functions: convert a page and protection to a page entry,
* and a page entry and page directory to the page they refer to.
*/
#define mk_pte(page, prot) (pfn_pte(page_to_pfn(page), prot))
/*
* Conversion functions: convert a page and protection to a page entry,
* and a page entry and page directory to the page they refer to.
*/
#define pmd_phys(pmd) virt_to_phys((void *)pmd_val(pmd))
#define pmd_pfn(pmd) (pmd_phys(pmd) >> PAGE_SHIFT)
#define pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
static inline unsigned long pmd_page_vaddr(pmd_t pmd)
{
return pmd_val(pmd);
}
#define pte_ERROR(e) \
pr_err("%s:%d: bad pte %08lx.\n", \
__FILE__, __LINE__, pte_val(e))
#define pgd_ERROR(e) \
pr_err("%s:%d: bad pgd %08lx.\n", \
__FILE__, __LINE__, pgd_val(e))
/*
* Encode and decode a swap entry (must be !pte_none(pte) && !pte_present(pte):
*
* 31 30 29 28 27 26 25 24 23 22 21 20 19 18 ... 1 0
* 0 0 0 0 type. 0 0 0 0 0 0 offset.........
*
* This gives us up to 2**2 = 4 swap files and 2**20 * 4K = 4G per swap file.
*
* Note that the offset field is always non-zero, thus !pte_none(pte) is always
* true.
*/
#define __swp_type(swp) (((swp).val >> 26) & 0x3)
#define __swp_offset(swp) ((swp).val & 0xfffff)
#define __swp_entry(type, off) ((swp_entry_t) { (((type) & 0x3) << 26) \
| ((off) & 0xfffff) })
#define __swp_entry_to_pte(swp) ((pte_t) { (swp).val })
#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
extern void __init paging_init(void);
extern void __init mmu_init(void);
extern void update_mmu_cache(struct vm_area_struct *vma,
unsigned long address, pte_t *pte);
#endif /* _ASM_NIOS2_PGTABLE_H */
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