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276 lines
7.4 KiB
C
276 lines
7.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2020 Loongson Technology Corporation Limited
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*/
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#ifndef _ASM_PGTABLE_64_H
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#define _ASM_PGTABLE_64_H
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#include <linux/compiler.h>
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#include <linux/linkage.h>
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#include <asm/addrspace.h>
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#if CONFIG_PGTABLE_LEVELS == 2
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#include <asm-generic/pgtable-nopmd.h>
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#elif CONFIG_PGTABLE_LEVELS == 3
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#include <asm-generic/pgtable-nopud.h>
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#else
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#include <asm-generic/pgtable-nop4d.h>
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#endif
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#define PGD_ORDER 0
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#define PUD_ORDER 0
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#define PMD_ORDER 0
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#define PTE_ORDER 0
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#if CONFIG_PGTABLE_LEVELS == 2
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#define PGDIR_SHIFT (PAGE_SHIFT + (PAGE_SHIFT + PTE_ORDER - 3))
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#elif CONFIG_PGTABLE_LEVELS == 3
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#define PMD_SHIFT (PAGE_SHIFT + (PAGE_SHIFT + PTE_ORDER - 3))
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#define PMD_SIZE (1UL << PMD_SHIFT)
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#define PMD_MASK (~(PMD_SIZE-1))
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#define PGDIR_SHIFT (PMD_SHIFT + (PAGE_SHIFT + PMD_ORDER - 3))
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#elif CONFIG_PGTABLE_LEVELS == 4
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#define PMD_SHIFT (PAGE_SHIFT + (PAGE_SHIFT + PTE_ORDER - 3))
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#define PMD_SIZE (1UL << PMD_SHIFT)
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#define PMD_MASK (~(PMD_SIZE-1))
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#define PUD_SHIFT (PMD_SHIFT + (PAGE_SHIFT + PMD_ORDER - 3))
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#define PUD_SIZE (1UL << PUD_SHIFT)
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#define PUD_MASK (~(PUD_SIZE-1))
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#define PGDIR_SHIFT (PUD_SHIFT + (PAGE_SHIFT + PUD_ORDER - 3))
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#endif
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#define PGDIR_SIZE (1UL << PGDIR_SHIFT)
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#define PGDIR_MASK (~(PGDIR_SIZE-1))
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#define VA_BITS (PGDIR_SHIFT + (PAGE_SHIFT + PGD_ORDER - 3))
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#define PTRS_PER_PGD ((PAGE_SIZE << PGD_ORDER) >> 3)
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#if CONFIG_PGTABLE_LEVELS > 3
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#define PTRS_PER_PUD ((PAGE_SIZE << PUD_ORDER) >> 3)
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#endif
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#if CONFIG_PGTABLE_LEVELS > 2
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#define PTRS_PER_PMD ((PAGE_SIZE << PMD_ORDER) >> 3)
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#endif
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#define PTRS_PER_PTE ((PAGE_SIZE << PTE_ORDER) >> 3)
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#define USER_PTRS_PER_PGD ((TASK_SIZE64 / PGDIR_SIZE)?(TASK_SIZE64 / PGDIR_SIZE):1)
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#define FIRST_USER_ADDRESS 0UL
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#ifndef __ASSEMBLY__
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#include <asm/fixmap.h>
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/*
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* TLB refill handlers may also map the vmalloc area into xkvrange.
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* Avoid the first couple of pages so NULL pointer dereferences will
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* still reliably trap.
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*/
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#define MODULES_VADDR (vm_map_base + PCI_IOSIZE + (2 * PAGE_SIZE))
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#define MODULES_END (MODULES_VADDR + SZ_256M)
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#define VMALLOC_START MODULES_END
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#ifndef CONFIG_KASAN
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#define VMALLOC_END \
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(vm_map_base + \
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min(PTRS_PER_PGD * PTRS_PER_PUD * PTRS_PER_PMD * PTRS_PER_PTE * PAGE_SIZE, (1UL << cpu_vabits)) - PMD_SIZE - VMEMMAP_SIZE)
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#else
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#define VMALLOC_END \
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(vm_map_base + \
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min(PTRS_PER_PGD * PTRS_PER_PUD * PTRS_PER_PMD * PTRS_PER_PTE * PAGE_SIZE, (1UL << cpu_vabits) / 2) - PMD_SIZE - VMEMMAP_SIZE)
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#endif
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#define vmemmap ((struct page *)((VMALLOC_END + PMD_SIZE) & PMD_MASK))
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#define VMEMMAP_END ((unsigned long)vmemmap + VMEMMAP_SIZE - 1)
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#define pte_ERROR(e) \
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printk("%s:%d: bad pte %016lx.\n", __FILE__, __LINE__, pte_val(e))
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#ifndef __PAGETABLE_PMD_FOLDED
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#define pmd_ERROR(e) \
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printk("%s:%d: bad pmd %016lx.\n", __FILE__, __LINE__, pmd_val(e))
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#endif
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#ifndef __PAGETABLE_PUD_FOLDED
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#define pud_ERROR(e) \
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printk("%s:%d: bad pud %016lx.\n", __FILE__, __LINE__, pud_val(e))
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#endif
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#define pgd_ERROR(e) \
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printk("%s:%d: bad pgd %016lx.\n", __FILE__, __LINE__, pgd_val(e))
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extern pte_t invalid_pte_table[PTRS_PER_PTE];
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#ifndef __PAGETABLE_PUD_FOLDED
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/*
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* For 4-level pagetables we defines these ourselves, for 3-level the
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* definitions are below, for 2-level the
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* definitions are supplied by <asm-generic/pgtable-nopmd.h>.
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*/
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typedef struct { unsigned long pud; } pud_t;
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#define pud_val(x) ((x).pud)
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#define __pud(x) ((pud_t) { (x) })
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extern pud_t invalid_pud_table[PTRS_PER_PUD];
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/*
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* Empty pgd entries point to the invalid_pud_table.
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*/
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static inline int p4d_none(p4d_t p4d)
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{
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return p4d_val(p4d) == (unsigned long)invalid_pud_table;
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}
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static inline int p4d_bad(p4d_t p4d)
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{
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if (unlikely(p4d_val(p4d) & ~PAGE_MASK))
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return 1;
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return 0;
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}
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static inline int p4d_present(p4d_t p4d)
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{
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return p4d_val(p4d) != (unsigned long)invalid_pud_table;
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}
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static inline void p4d_clear(pgd_t *p4dp)
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{
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p4d_val(*p4dp) = (unsigned long)invalid_pud_table;
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}
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static inline unsigned long p4d_page_vaddr(p4d_t p4d)
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{
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return p4d_val(p4d);
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}
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static inline void set_p4d(pgd_t *p4d, pgd_t p4dval)
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{
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*p4d = p4dval;
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}
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#endif
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#ifndef __PAGETABLE_PMD_FOLDED
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/*
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* For 3-level pagetables we defines these ourselves, for 2-level the
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* definitions are supplied by <asm-generic/pgtable-nopmd.h>.
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*/
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typedef struct { unsigned long pmd; } pmd_t;
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#define pmd_val(x) ((x).pmd)
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#define __pmd(x) ((pmd_t) { (x) })
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static inline pmd_t *pud_pgtable(pud_t pud)
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{
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return (pmd_t *)pud_val(pud);
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}
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#define pud_phys(pud) virt_to_phys((void *)pud_val(pud))
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#define pud_page(pud) (pfn_to_page(pud_phys(pud) >> PAGE_SHIFT))
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extern pmd_t invalid_pmd_table[PTRS_PER_PMD];
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#endif
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/*
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* Empty pgd/pmd entries point to the invalid_pte_table.
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*/
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static inline int pmd_none(pmd_t pmd)
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{
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return pmd_val(pmd) == (unsigned long) invalid_pte_table;
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}
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#define pmd_leaf(pmd) ((pmd_val(pmd) & _PAGE_HUGE) != 0)
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static inline int pmd_bad(pmd_t pmd)
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{
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/* pmd_huge(pmd) but inline */
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if (unlikely(pmd_val(pmd) & _PAGE_HUGE))
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return 1;
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if (unlikely(pmd_val(pmd) & ~PAGE_MASK))
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return 1;
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return 0;
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}
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static inline int pmd_present(pmd_t pmd)
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{
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if (unlikely(pmd_val(pmd) & _PAGE_HUGE))
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return !!(pmd_val(pmd) & (_PAGE_PRESENT | _PAGE_PROTNONE));
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return pmd_val(pmd) != (unsigned long) invalid_pte_table;
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}
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static inline void pmd_clear(pmd_t *pmdp)
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{
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pmd_val(*pmdp) = ((unsigned long) invalid_pte_table);
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}
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#ifndef __PAGETABLE_PMD_FOLDED
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/*
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* Empty pud entries point to the invalid_pmd_table.
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*/
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static inline int pud_none(pud_t pud)
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{
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return pud_val(pud) == (unsigned long) invalid_pmd_table;
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}
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static inline int pud_bad(pud_t pud)
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{
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return pud_val(pud) & ~PAGE_MASK;
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}
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static inline int pud_present(pud_t pud)
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{
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return pud_val(pud) != (unsigned long) invalid_pmd_table;
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}
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static inline void pud_clear(pud_t *pudp)
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{
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pud_val(*pudp) = ((unsigned long) invalid_pmd_table);
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}
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#endif
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#define pte_page(x) pfn_to_page(pte_pfn(x))
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#define pte_pfn(x) ((unsigned long)(((x).pte & _PFN_MASK) >> _PFN_SHIFT))
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#define pfn_pte(pfn, prot) __pte(((pfn) << _PFN_SHIFT) | pgprot_val(prot))
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#define pfn_pmd(pfn, prot) __pmd(((pfn) << _PFN_SHIFT) | pgprot_val(prot))
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#define __pgd_offset(address) pgd_index(address)
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#define __pud_offset(address) (((address) >> PUD_SHIFT) & (PTRS_PER_PUD-1))
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#define __pmd_offset(address) pmd_index(address)
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#ifndef __PAGETABLE_PMD_FOLDED
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static inline unsigned long pud_page_vaddr(pud_t pud)
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{
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return pud_val(pud);
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}
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#define pud_phys(pud) virt_to_phys((void *)pud_val(pud))
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#define pud_page(pud) (pfn_to_page(pud_phys(pud) >> PAGE_SHIFT))
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#endif
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/*
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* Initialize a new pgd / pmd table with invalid pointers.
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*/
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extern void pgd_init(unsigned long page);
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extern void pud_init(unsigned long page, unsigned long pagetable);
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extern void pmd_init(unsigned long page, unsigned long pagetable);
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/*
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* Non-present pages: high 40 bits are offset, next 8 bits type,
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* low 16 bits zero.
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*/
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static inline pte_t mk_swap_pte(unsigned long type, unsigned long offset)
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{ pte_t pte; pte_val(pte) = (type << 16) | (offset << 24); return pte; }
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#define __swp_type(x) (((x).val >> 16) & 0xff)
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#define __swp_offset(x) ((x).val >> 24)
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#define __swp_entry(type, offset) ((swp_entry_t) { pte_val(mk_swap_pte((type), (offset))) })
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#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
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#define __swp_entry_to_pte(x) ((pte_t) { (x).val })
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#define __pmd_to_swp_entry(pmd) ((swp_entry_t) { pmd_val(pmd) })
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#define __swp_entry_to_pmd(x) ((pmd_t) { (x).val | _PAGE_HUGE })
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#endif /* !__ASSEMBLY__ */
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#endif /* _ASM_PGTABLE_64_H */
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