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pgtable.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.
 *
 * Copyright (C) 2003 Ralf Baechle
 */
#ifndef _ASM_PGTABLE_H
#define _ASM_PGTABLE_H

#ifdef CONFIG_32BIT
#include <asm/pgtable-32.h>
#endif
#ifdef CONFIG_64BIT
#include <asm/pgtable-64.h>
#endif

#include <asm/io.h>
#include <asm/pgtable-bits.h>

struct mm_struct;
struct vm_area_struct;

#define PAGE_NONE __pgprot(_PAGE_PRESENT | _CACHE_CACHABLE_NONCOHERENT)
#define PAGE_SHARED     __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
                         _page_cachable_default)
#define PAGE_COPY __pgprot(_PAGE_PRESENT | _PAGE_READ | \
                         _page_cachable_default)
#define PAGE_READONLY   __pgprot(_PAGE_PRESENT | _PAGE_READ | \
                         _page_cachable_default)
#define PAGE_KERNEL     __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
                         _PAGE_GLOBAL | _page_cachable_default)
#define PAGE_USERIO     __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
                         _page_cachable_default)
#define PAGE_KERNEL_UNCACHED __pgprot(_PAGE_PRESENT | __READABLE | \
                  __WRITEABLE | _PAGE_GLOBAL | _CACHE_UNCACHED)

/*
 * MIPS can't do page protection for execute, and considers that the same like
 * read. Also, write permissions imply read permissions. This is the closest
 * we can get by reasonable means..
 */

/*
 * Dummy values to fill the table in mmap.c
 * The real values will be generated at runtime
 */
#define __P000 __pgprot(0)
#define __P001 __pgprot(0)
#define __P010 __pgprot(0)
#define __P011 __pgprot(0)
#define __P100 __pgprot(0)
#define __P101 __pgprot(0)
#define __P110 __pgprot(0)
#define __P111 __pgprot(0)

#define __S000 __pgprot(0)
#define __S001 __pgprot(0)
#define __S010 __pgprot(0)
#define __S011 __pgprot(0)
#define __S100 __pgprot(0)
#define __S101 __pgprot(0)
#define __S110 __pgprot(0)
#define __S111 __pgprot(0)

extern unsigned long _page_cachable_default;

/*
 * ZERO_PAGE is a global shared page that is always zero; used
 * for zero-mapped memory areas etc..
 */

extern unsigned long empty_zero_page;
extern unsigned long zero_page_mask;

#define ZERO_PAGE(vaddr) \
      (virt_to_page((void *)(empty_zero_page + (((unsigned long)(vaddr)) & zero_page_mask))))

extern void paging_init(void);

/*
 * 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_page(pmd)         (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
#define pmd_page_vaddr(pmd)   pmd_val(pmd)

#if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)

#define pte_none(pte)         (!(((pte).pte_low | (pte).pte_high) & ~_PAGE_GLOBAL))
#define pte_present(pte)      ((pte).pte_low & _PAGE_PRESENT)

static inline void set_pte(pte_t *ptep, pte_t pte)
{
      ptep->pte_high = pte.pte_high;
      smp_wmb();
      ptep->pte_low = pte.pte_low;
      //printk("pte_high %x pte_low %x\n", ptep->pte_high, ptep->pte_low);

      if (pte.pte_low & _PAGE_GLOBAL) {
            pte_t *buddy = ptep_buddy(ptep);
            /*
             * Make sure the buddy is global too (if it's !none,
             * it better already be global)
             */
            if (pte_none(*buddy)) {
                  buddy->pte_low  |= _PAGE_GLOBAL;
                  buddy->pte_high |= _PAGE_GLOBAL;
            }
      }
}
#define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval)

static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
{
      pte_t null = __pte(0);

      /* Preserve global status for the pair */
      if (ptep_buddy(ptep)->pte_low & _PAGE_GLOBAL)
            null.pte_low = null.pte_high = _PAGE_GLOBAL;

      set_pte_at(mm, addr, ptep, null);
}
#else

#define pte_none(pte)         (!(pte_val(pte) & ~_PAGE_GLOBAL))
#define pte_present(pte)      (pte_val(pte) & _PAGE_PRESENT)

/*
 * Certain architectures need to do special things when pte's
 * within a page table are directly modified.  Thus, the following
 * hook is made available.
 */
static inline void set_pte(pte_t *ptep, pte_t pteval)
{
      *ptep = pteval;
#if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
      if (pte_val(pteval) & _PAGE_GLOBAL) {
            pte_t *buddy = ptep_buddy(ptep);
            /*
             * Make sure the buddy is global too (if it's !none,
             * it better already be global)
             */
            if (pte_none(*buddy))
                  pte_val(*buddy) = pte_val(*buddy) | _PAGE_GLOBAL;
      }
#endif
}
#define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval)

static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
{
#if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
      /* Preserve global status for the pair */
      if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL)
            set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL));
      else
#endif
            set_pte_at(mm, addr, ptep, __pte(0));
}
#endif

/*
 * (pmds are folded into puds so this doesn't get actually called,
 * but the define is needed for a generic inline function.)
 */
#define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while(0)

#ifdef CONFIG_64BIT
/*
 * (puds are folded into pgds so this doesn't get actually called,
 * but the define is needed for a generic inline function.)
 */
#define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0)
#endif

#define PGD_T_LOG2      (__builtin_ffs(sizeof(pgd_t)) - 1)
#define PMD_T_LOG2      (__builtin_ffs(sizeof(pmd_t)) - 1)
#define PTE_T_LOG2      (__builtin_ffs(sizeof(pte_t)) - 1)

/*
 * We used to declare this array with size but gcc 3.3 and older are not able
 * to find that this expression is a constant, so the size is dropped.
 */
extern pgd_t swapper_pg_dir[];

/*
 * The following only work if pte_present() is true.
 * Undefined behaviour if not..
 */
#if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
static inline int pte_write(pte_t pte)    { return pte.pte_low & _PAGE_WRITE; }
static inline int pte_dirty(pte_t pte)    { return pte.pte_low & _PAGE_MODIFIED; }
static inline int pte_young(pte_t pte)    { return pte.pte_low & _PAGE_ACCESSED; }
static inline int pte_file(pte_t pte)     { return pte.pte_low & _PAGE_FILE; }

static inline pte_t pte_wrprotect(pte_t pte)
{
      pte.pte_low  &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
      pte.pte_high &= ~_PAGE_SILENT_WRITE;
      return pte;
}

static inline pte_t pte_mkclean(pte_t pte)
{
      pte.pte_low  &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE);
      pte.pte_high &= ~_PAGE_SILENT_WRITE;
      return pte;
}

static inline pte_t pte_mkold(pte_t pte)
{
      pte.pte_low  &= ~(_PAGE_ACCESSED | _PAGE_SILENT_READ);
      pte.pte_high &= ~_PAGE_SILENT_READ;
      return pte;
}

static inline pte_t pte_mkwrite(pte_t pte)
{
      pte.pte_low |= _PAGE_WRITE;
      if (pte.pte_low & _PAGE_MODIFIED) {
            pte.pte_low  |= _PAGE_SILENT_WRITE;
            pte.pte_high |= _PAGE_SILENT_WRITE;
      }
      return pte;
}

static inline pte_t pte_mkdirty(pte_t pte)
{
      pte.pte_low |= _PAGE_MODIFIED;
      if (pte.pte_low & _PAGE_WRITE) {
            pte.pte_low  |= _PAGE_SILENT_WRITE;
            pte.pte_high |= _PAGE_SILENT_WRITE;
      }
      return pte;
}

static inline pte_t pte_mkyoung(pte_t pte)
{
      pte.pte_low |= _PAGE_ACCESSED;
      if (pte.pte_low & _PAGE_READ) {
            pte.pte_low  |= _PAGE_SILENT_READ;
            pte.pte_high |= _PAGE_SILENT_READ;
      }
      return pte;
}
#else
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_MODIFIED; }
static inline int pte_young(pte_t pte)    { return pte_val(pte) & _PAGE_ACCESSED; }
static inline int pte_file(pte_t pte)     { return pte_val(pte) & _PAGE_FILE; }

static inline pte_t pte_wrprotect(pte_t pte)
{
      pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
      return pte;
}

static inline pte_t pte_mkclean(pte_t pte)
{
      pte_val(pte) &= ~(_PAGE_MODIFIED|_PAGE_SILENT_WRITE);
      return pte;
}

static inline pte_t pte_mkold(pte_t pte)
{
      pte_val(pte) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);
      return pte;
}

static inline pte_t pte_mkwrite(pte_t pte)
{
      pte_val(pte) |= _PAGE_WRITE;
      if (pte_val(pte) & _PAGE_MODIFIED)
            pte_val(pte) |= _PAGE_SILENT_WRITE;
      return pte;
}

static inline pte_t pte_mkdirty(pte_t pte)
{
      pte_val(pte) |= _PAGE_MODIFIED;
      if (pte_val(pte) & _PAGE_WRITE)
            pte_val(pte) |= _PAGE_SILENT_WRITE;
      return pte;
}

static inline pte_t pte_mkyoung(pte_t pte)
{
      pte_val(pte) |= _PAGE_ACCESSED;
      if (pte_val(pte) & _PAGE_READ)
            pte_val(pte) |= _PAGE_SILENT_READ;
      return pte;
}
#endif
static inline int pte_special(pte_t pte)  { return 0; }
static inline pte_t pte_mkspecial(pte_t pte)    { return pte; }

/*
 * Macro to make mark a page protection value as "uncacheable".  Note
 * that "protection" is really a misnomer here as the protection value
 * contains the memory attribute bits, dirty bits, and various other
 * bits as well.
 */
#define pgprot_noncached pgprot_noncached

static inline pgprot_t pgprot_noncached(pgprot_t _prot)
{
      unsigned long prot = pgprot_val(_prot);

      prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED;

      return __pgprot(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 mk_pte(page, pgprot)  pfn_pte(page_to_pfn(page), (pgprot))

#if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
{
      pte.pte_low  &= _PAGE_CHG_MASK;
      pte.pte_high &= ~0x3f;
      pte.pte_low  |= pgprot_val(newprot);
      pte.pte_high |= pgprot_val(newprot) & 0x3f;
      return pte;
}
#else
static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
{
      return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot));
}
#endif


extern void __update_tlb(struct vm_area_struct *vma, unsigned long address,
      pte_t pte);
extern void __update_cache(struct vm_area_struct *vma, unsigned long address,
      pte_t pte);

static inline void update_mmu_cache(struct vm_area_struct *vma,
      unsigned long address, pte_t pte)
{
      __update_tlb(vma, address, pte);
      __update_cache(vma, address, pte);
}

#define kern_addr_valid(addr) (1)

#ifdef CONFIG_64BIT_PHYS_ADDR
extern int remap_pfn_range(struct vm_area_struct *vma, unsigned long from, unsigned long pfn, unsigned long size, pgprot_t prot);

static inline int io_remap_pfn_range(struct vm_area_struct *vma,
            unsigned long vaddr,
            unsigned long pfn,
            unsigned long size,
            pgprot_t prot)
{
      phys_t phys_addr_high = fixup_bigphys_addr(pfn << PAGE_SHIFT, size);
      return remap_pfn_range(vma, vaddr, phys_addr_high >> PAGE_SHIFT, size, prot);
}
#else
#define io_remap_pfn_range(vma, vaddr, pfn, size, prot)           \
            remap_pfn_range(vma, vaddr, pfn, size, prot)
#endif

#include <asm-generic/pgtable.h>

/*
 * We provide our own get_unmapped area to cope with the virtual aliasing
 * constraints placed on us by the cache architecture.
 */
#define HAVE_ARCH_UNMAPPED_AREA

/*
 * No page table caches to initialise
 */
#define pgtable_cache_init()  do { } while (0)

#endif /* _ASM_PGTABLE_H */

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