1/* SPDX-License-Identifier: GPL-2.0 */
  2/*
  3 * Copyright 2003 PathScale Inc
  4 * Derived from include/asm-i386/pgtable.h
  5 */
  6
  7#ifndef __UM_PGTABLE_4LEVEL_H
  8#define __UM_PGTABLE_4LEVEL_H
  9
 10#include <asm-generic/pgtable-nop4d.h>
 11
 12/* PGDIR_SHIFT determines what a fourth-level page table entry can map */
 13
 14#define PGDIR_SHIFT	39
 15#define PGDIR_SIZE	(1UL << PGDIR_SHIFT)
 16#define PGDIR_MASK	(~(PGDIR_SIZE-1))
 17
 18/* PUD_SHIFT determines the size of the area a third-level page table can
 19 * map
 20 */
 21
 22#define PUD_SHIFT	30
 23#define PUD_SIZE	(1UL << PUD_SHIFT)
 24#define PUD_MASK	(~(PUD_SIZE-1))
 25
 26/* PMD_SHIFT determines the size of the area a second-level page table can
 27 * map
 28 */
 29
 30#define PMD_SHIFT	21
 31#define PMD_SIZE	(1UL << PMD_SHIFT)
 32#define PMD_MASK	(~(PMD_SIZE-1))
 33
 34/*
 35 * entries per page directory level
 36 */
 37
 38#define PTRS_PER_PTE 512
 39#define PTRS_PER_PMD 512
 40#define PTRS_PER_PUD 512
 41#define PTRS_PER_PGD 512
 42
 43#define USER_PTRS_PER_PGD ((TASK_SIZE + (PGDIR_SIZE - 1)) / PGDIR_SIZE)
 44
 45#define pte_ERROR(e) \
 46        printk("%s:%d: bad pte %p(%016lx).\n", __FILE__, __LINE__, &(e), \
 47	       pte_val(e))
 48#define pmd_ERROR(e) \
 49        printk("%s:%d: bad pmd %p(%016lx).\n", __FILE__, __LINE__, &(e), \
 50	       pmd_val(e))
 51#define pud_ERROR(e) \
 52        printk("%s:%d: bad pud %p(%016lx).\n", __FILE__, __LINE__, &(e), \
 53	       pud_val(e))
 54#define pgd_ERROR(e) \
 55        printk("%s:%d: bad pgd %p(%016lx).\n", __FILE__, __LINE__, &(e), \
 56	       pgd_val(e))
 57
 58#define pud_none(x)	(!(pud_val(x) & ~_PAGE_NEEDSYNC))
 59#define	pud_bad(x)	((pud_val(x) & (~PAGE_MASK & ~_PAGE_USER)) != _KERNPG_TABLE)
 60#define pud_present(x)	(pud_val(x) & _PAGE_PRESENT)
 61#define pud_populate(mm, pud, pmd) \
 62	set_pud(pud, __pud(_PAGE_TABLE + __pa(pmd)))
 63
 64#define set_pud(pudptr, pudval) (*(pudptr) = (pudval))
 65
 66#define p4d_none(x)	(!(p4d_val(x) & ~_PAGE_NEEDSYNC))
 67#define	p4d_bad(x)	((p4d_val(x) & (~PAGE_MASK & ~_PAGE_USER)) != _KERNPG_TABLE)
 68#define p4d_present(x)	(p4d_val(x) & _PAGE_PRESENT)
 69#define p4d_populate(mm, p4d, pud) \
 70	set_p4d(p4d, __p4d(_PAGE_TABLE + __pa(pud)))
 71
 72#define set_p4d(p4dptr, p4dval) (*(p4dptr) = (p4dval))
 73
 74
 75static inline int pgd_needsync(pgd_t pgd)
 76{
 77	return pgd_val(pgd) & _PAGE_NEEDSYNC;
 78}
 79
 80static inline void pgd_mkuptodate(pgd_t pgd) { pgd_val(pgd) &= ~_PAGE_NEEDSYNC; }
 81
 82#define set_pmd(pmdptr, pmdval) (*(pmdptr) = (pmdval))
 83
 84static inline void pud_clear (pud_t *pud)
 85{
 86	set_pud(pud, __pud(_PAGE_NEEDSYNC));
 87}
 88
 89static inline void p4d_clear (p4d_t *p4d)
 90{
 91	set_p4d(p4d, __p4d(_PAGE_NEEDSYNC));
 92}
 93
 94#define pud_page(pud) phys_to_page(pud_val(pud) & PAGE_MASK)
 95#define pud_pgtable(pud) ((pmd_t *) __va(pud_val(pud) & PAGE_MASK))
 96
 97#define p4d_page(p4d) phys_to_page(p4d_val(p4d) & PAGE_MASK)
 98#define p4d_pgtable(p4d) ((pud_t *) __va(p4d_val(p4d) & PAGE_MASK))
 99
100static inline unsigned long pte_pfn(pte_t pte)
101{
102	return phys_to_pfn(pte_val(pte));
103}
104
105static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot)
106{
107	pte_t pte;
108	phys_t phys = pfn_to_phys(page_nr);
109
110	pte_set_val(pte, phys, pgprot);
111	return pte;
112}
113
114static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot)
115{
116	return __pmd((page_nr << PAGE_SHIFT) | pgprot_val(pgprot));
117}
118
119#endif