/* SPDX-License-Identifier: GPL-2.0 */
#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 union {
        struct {
                unsigned long pmd_low;
                unsigned long pmd_high;
        };
        unsigned long long pmd;
} pmd_t;
#define pmd_val(x)      ((x).pmd)
#define __pmd(x)        ((pmd_t) { .pmd = (x) } )

static inline pmd_t *pud_pgtable(pud_t pud)
{
        return (pmd_t *)(unsigned long)pud_val(pud);
}

/* only used by the stubbed out hugetlb gup code, should never be called */
#define pud_page(pud)           NULL
#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 */