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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150/* SPDX-License-Identifier: GPL-2.0-only *//* * arch/arm/include/asm/pgalloc.h * * Copyright (C) 2000-2001 Russell King */#ifndef _ASMARM_PGALLOC_H#define _ASMARM_PGALLOC_H
#include <linux/pagemap.h>
#include <asm/domain.h>#include <asm/pgtable-hwdef.h>#include <asm/processor.h>#include <asm/cacheflush.h>#include <asm/tlbflush.h>
#ifdef CONFIG_MMU
#define _PAGE_USER_TABLE (PMD_TYPE_TABLE | PMD_BIT4 | PMD_DOMAIN(DOMAIN_USER))#define _PAGE_KERNEL_TABLE (PMD_TYPE_TABLE | PMD_BIT4 | PMD_DOMAIN(DOMAIN_KERNEL))
#ifdef CONFIG_ARM_LPAE#define PGD_SIZE (PTRS_PER_PGD * sizeof(pgd_t))
static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd){ set_pud(pud, __pud(__pa(pmd) | PMD_TYPE_TABLE));}
#else /* !CONFIG_ARM_LPAE */#define PGD_SIZE (PAGE_SIZE << 2)
/* * Since we have only two-level page tables, these are trivial */#define pmd_alloc_one(mm,addr) ({ BUG(); ((pmd_t *)2); })#define pmd_free(mm, pmd) do { } while (0)#ifdef CONFIG_KASAN/* The KASan core unconditionally calls pud_populate() on all architectures */#define pud_populate(mm,pmd,pte) do { } while (0)#else#define pud_populate(mm,pmd,pte) BUG()#endif#endif /* CONFIG_ARM_LPAE */
extern pgd_t *pgd_alloc(struct mm_struct *mm);extern void pgd_free(struct mm_struct *mm, pgd_t *pgd);
static inline void clean_pte_table(pte_t *pte){ clean_dcache_area(pte + PTE_HWTABLE_PTRS, PTE_HWTABLE_SIZE);}
/* * Allocate one PTE table. * * This actually allocates two hardware PTE tables, but we wrap this up * into one table thus: * * +------------+ * | Linux pt 0 | * +------------+ * | Linux pt 1 | * +------------+ * | h/w pt 0 | * +------------+ * | h/w pt 1 | * +------------+ */
#define __HAVE_ARCH_PTE_ALLOC_ONE_KERNEL#define __HAVE_ARCH_PTE_ALLOC_ONE#define __HAVE_ARCH_PGD_FREE#include <asm-generic/pgalloc.h>
static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm){ pte_t *pte = __pte_alloc_one_kernel(mm);
if (pte) clean_pte_table(pte);
return pte;}
#ifdef CONFIG_HIGHPTE#define PGTABLE_HIGHMEM __GFP_HIGHMEM#else#define PGTABLE_HIGHMEM 0#endif
static inline pgtable_tpte_alloc_one(struct mm_struct *mm){ struct page *pte;
pte = __pte_alloc_one(mm, GFP_PGTABLE_USER | PGTABLE_HIGHMEM); if (!pte) return NULL; if (!PageHighMem(pte)) clean_pte_table(page_address(pte)); return pte;}
static inline void __pmd_populate(pmd_t *pmdp, phys_addr_t pte, pmdval_t prot){ pmdval_t pmdval = (pte + PTE_HWTABLE_OFF) | prot; pmdp[0] = __pmd(pmdval);#ifndef CONFIG_ARM_LPAE pmdp[1] = __pmd(pmdval + 256 * sizeof(pte_t));#endif flush_pmd_entry(pmdp);}
/* * Populate the pmdp entry with a pointer to the pte. This pmd is part * of the mm address space. * * Ensure that we always set both PMD entries. */static inline voidpmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp, pte_t *ptep){ /* * The pmd must be loaded with the physical address of the PTE table */ __pmd_populate(pmdp, __pa(ptep), _PAGE_KERNEL_TABLE);}
static inline voidpmd_populate(struct mm_struct *mm, pmd_t *pmdp, pgtable_t ptep){ extern pmdval_t user_pmd_table; pmdval_t prot;
if (__LINUX_ARM_ARCH__ >= 6 && !IS_ENABLED(CONFIG_ARM_LPAE)) prot = user_pmd_table; else prot = _PAGE_USER_TABLE;
__pmd_populate(pmdp, page_to_phys(ptep), prot);}
#endif /* CONFIG_MMU */
#endif