pgtable-3level.h

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#ifndef __ASM_SH_PGTABLE_3LEVEL_H
#define __ASM_SH_PGTABLE_3LEVEL_H

#include <asm-generic/pgtable-nopud.h>

/*
 * Some cores need a 3-level page table layout, for example when using
 * 64-bit PTEs and 4K pages.
 */
#define PAGETABLE_LEVELS    3

#define PTE_MAGNITUDE       3   /* 64-bit PTEs on SH-X2 TLB */

/* PGD bits */
#define PGDIR_SHIFT     30

#define PTRS_PER_PGD        4
#define USER_PTRS_PER_PGD   2

/* PMD bits */
#define PMD_SHIFT   (PAGE_SHIFT + (PAGE_SHIFT - PTE_MAGNITUDE))
#define PMD_SIZE    (1UL << PMD_SHIFT)
#define PMD_MASK    (~(PMD_SIZE-1))

#define PTRS_PER_PMD    ((1 << PGDIR_SHIFT) / PMD_SIZE)

#define pmd_ERROR(e) \
    printk("%s:%d: bad pmd %016llx.\n", __FILE__, __LINE__, pmd_val(e))

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

static inline unsigned long pud_page_vaddr(pud_t pud)
{
    return pud_val(pud);
}

#define pmd_index(address)  (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1))
static inline pmd_t *pmd_offset(pud_t *pud, unsigned long address)
{
    return (pmd_t *)pud_page_vaddr(*pud) + pmd_index(address);
}

#define pud_none(x) (!pud_val(x))
#define pud_present(x)  (pud_val(x))
#define pud_clear(xp)   do { set_pud(xp, __pud(0)); } while (0)
#define pud_bad(x)  (pud_val(x) & ~PAGE_MASK)

/*
 * (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 /* __ASM_SH_PGTABLE_3LEVEL_H */