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page.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) 1994 - 1999, 2000, 03 Ralf Baechle
 * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
 */
#ifndef _ASM_PAGE_H
#define _ASM_PAGE_H

#include <spaces.h>
#include <linux/const.h>

/*
 * PAGE_SHIFT determines the page size
 */
#ifdef CONFIG_PAGE_SIZE_4KB
#define PAGE_SHIFT      12
#endif
#ifdef CONFIG_PAGE_SIZE_8KB
#define PAGE_SHIFT      13
#endif
#ifdef CONFIG_PAGE_SIZE_16KB
#define PAGE_SHIFT      14
#endif
#ifdef CONFIG_PAGE_SIZE_32KB
#define PAGE_SHIFT      15
#endif
#ifdef CONFIG_PAGE_SIZE_64KB
#define PAGE_SHIFT      16
#endif
#define PAGE_SIZE (_AC(1,UL) << PAGE_SHIFT)
#define PAGE_MASK       (~((1 << PAGE_SHIFT) - 1))

#ifdef CONFIG_HUGETLB_PAGE
#define HPAGE_SHIFT     (PAGE_SHIFT + PAGE_SHIFT - 3)
#define HPAGE_SIZE      (_AC(1,UL) << HPAGE_SHIFT)
#define HPAGE_MASK      (~(HPAGE_SIZE - 1))
#define HUGETLB_PAGE_ORDER    (HPAGE_SHIFT - PAGE_SHIFT)
#endif /* CONFIG_HUGETLB_PAGE */

#ifndef __ASSEMBLY__

#include <linux/pfn.h>
#include <asm/io.h>

extern void build_clear_page(void);
extern void build_copy_page(void);

/*
 * It's normally defined only for FLATMEM config but it's
 * used in our early mem init code for all memory models.
 * So always define it.
 */
#define ARCH_PFN_OFFSET       PFN_UP(PHYS_OFFSET)

extern void clear_page(void * page);
extern void copy_page(void * to, void * from);

extern unsigned long shm_align_mask;

static inline unsigned long pages_do_alias(unsigned long addr1,
      unsigned long addr2)
{
      return (addr1 ^ addr2) & shm_align_mask;
}

struct page;

static inline void clear_user_page(void *addr, unsigned long vaddr,
      struct page *page)
{
      extern void (*flush_data_cache_page)(unsigned long addr);

      clear_page(addr);
      if (pages_do_alias((unsigned long) addr, vaddr & PAGE_MASK))
            flush_data_cache_page((unsigned long)addr);
}

extern void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
      struct page *to);
struct vm_area_struct;
extern void copy_user_highpage(struct page *to, struct page *from,
      unsigned long vaddr, struct vm_area_struct *vma);

#define __HAVE_ARCH_COPY_USER_HIGHPAGE

/*
 * These are used to make use of C type-checking..
 */
#ifdef CONFIG_64BIT_PHYS_ADDR
  #ifdef CONFIG_CPU_MIPS32
    typedef struct { unsigned long pte_low, pte_high; } pte_t;
    #define pte_val(x)    ((x).pte_low | ((unsigned long long)(x).pte_high << 32))
    #define __pte(x)      ({ pte_t __pte = {(x), ((unsigned long long)(x)) >> 32}; __pte; })
  #else
     typedef struct { unsigned long long pte; } pte_t;
     #define pte_val(x) ((x).pte)
     #define __pte(x)   ((pte_t) { (x) } )
  #endif
#else
typedef struct { unsigned long pte; } pte_t;
#define pte_val(x)      ((x).pte)
#define __pte(x)  ((pte_t) { (x) } )
#endif
typedef struct page *pgtable_t;

/*
 * For 3-level pagetables we defines these ourselves, for 2-level the
 * definitions are supplied by <asm-generic/pgtable-nopmd.h>.
 */
#ifdef CONFIG_64BIT

typedef struct { unsigned long pmd; } pmd_t;
#define pmd_val(x)      ((x).pmd)
#define __pmd(x)  ((pmd_t) { (x) } )

#endif

/*
 * Right now we don't support 4-level pagetables, so all pud-related
 * definitions come from <asm-generic/pgtable-nopud.h>.
 */

/*
 * Finall the top of the hierarchy, the pgd
 */
typedef struct { unsigned long pgd; } pgd_t;
#define pgd_val(x)      ((x).pgd)
#define __pgd(x)  ((pgd_t) { (x) } )

/*
 * Manipulate page protection bits
 */
typedef struct { unsigned long pgprot; } pgprot_t;
#define pgprot_val(x)   ((x).pgprot)
#define __pgprot(x)     ((pgprot_t) { (x) } )

/*
 * On R4000-style MMUs where a TLB entry is mapping a adjacent even / odd
 * pair of pages we only have a single global bit per pair of pages.  When
 * writing to the TLB make sure we always have the bit set for both pages
 * or none.  This macro is used to access the `buddy' of the pte we're just
 * working on.
 */
#define ptep_buddy(x)   ((pte_t *)((unsigned long)(x) ^ sizeof(pte_t)))

#endif /* !__ASSEMBLY__ */

/*
 * __pa()/__va() should be used only during mem init.
 */
#ifdef CONFIG_64BIT
#define __pa(x)                                             \
({                                                    \
    unsigned long __x = (unsigned long)(x);                       \
    __x < CKSEG0 ? XPHYSADDR(__x) : CPHYSADDR(__x);               \
})
#else
#define __pa(x)                                             \
    ((unsigned long)(x) - PAGE_OFFSET + PHYS_OFFSET)
#endif
#define __va(x)         ((void *)((unsigned long)(x) + PAGE_OFFSET - PHYS_OFFSET))
#define __pa_symbol(x)  __pa(RELOC_HIDE((unsigned long)(x), 0))

#define pfn_to_kaddr(pfn)     __va((pfn) << PAGE_SHIFT)

#ifdef CONFIG_FLATMEM

#define pfn_valid(pfn)                                      \
({                                                    \
      unsigned long __pfn = (pfn);                          \
      /* avoid <linux/bootmem.h> include hell */                  \
      extern unsigned long min_low_pfn;                     \
                                                      \
      __pfn >= min_low_pfn && __pfn < max_mapnr;                  \
})

#elif defined(CONFIG_SPARSEMEM)

/* pfn_valid is defined in linux/mmzone.h */

#elif defined(CONFIG_NEED_MULTIPLE_NODES)

#define pfn_valid(pfn)                                      \
({                                                    \
      unsigned long __pfn = (pfn);                          \
      int __n = pfn_to_nid(__pfn);                          \
      ((__n >= 0) ? (__pfn < NODE_DATA(__n)->node_start_pfn +           \
                             NODE_DATA(__n)->node_spanned_pages)  \
                  : 0);                               \
})

#endif

#define virt_to_page(kaddr)   pfn_to_page(PFN_DOWN(virt_to_phys(kaddr)))
#define virt_addr_valid(kaddr)      pfn_valid(PFN_DOWN(virt_to_phys(kaddr)))

#define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \
                         VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)

#define UNCAC_ADDR(addr)      ((addr) - PAGE_OFFSET + UNCAC_BASE)
#define CAC_ADDR(addr)        ((addr) - UNCAC_BASE + PAGE_OFFSET)

#include <asm-generic/memory_model.h>
#include <asm-generic/getorder.h>

#endif /* _ASM_PAGE_H */

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