164 lines
3.7 KiB
C
164 lines
3.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2009 Chen Liqin <liqin.chen@sunplusct.com>
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* Copyright (C) 2012 Regents of the University of California
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*/
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#ifndef _ASM_RISCV_PGALLOC_H
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#define _ASM_RISCV_PGALLOC_H
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#include <linux/mm.h>
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#include <asm/tlb.h>
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#ifdef CONFIG_MMU
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#define __HAVE_ARCH_PUD_ALLOC_ONE
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#define __HAVE_ARCH_PUD_FREE
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#include <asm-generic/pgalloc.h>
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static inline void pmd_populate_kernel(struct mm_struct *mm,
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pmd_t *pmd, pte_t *pte)
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{
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unsigned long pfn = virt_to_pfn(pte);
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set_pmd(pmd, __pmd((pfn << _PAGE_PFN_SHIFT) | _PAGE_TABLE));
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}
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static inline void pmd_populate(struct mm_struct *mm,
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pmd_t *pmd, pgtable_t pte)
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{
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unsigned long pfn = virt_to_pfn(page_address(pte));
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set_pmd(pmd, __pmd((pfn << _PAGE_PFN_SHIFT) | _PAGE_TABLE));
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}
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#ifndef __PAGETABLE_PMD_FOLDED
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static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
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{
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unsigned long pfn = virt_to_pfn(pmd);
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set_pud(pud, __pud((pfn << _PAGE_PFN_SHIFT) | _PAGE_TABLE));
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}
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static inline void p4d_populate(struct mm_struct *mm, p4d_t *p4d, pud_t *pud)
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{
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if (pgtable_l4_enabled) {
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unsigned long pfn = virt_to_pfn(pud);
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set_p4d(p4d, __p4d((pfn << _PAGE_PFN_SHIFT) | _PAGE_TABLE));
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}
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}
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static inline void p4d_populate_safe(struct mm_struct *mm, p4d_t *p4d,
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pud_t *pud)
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{
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if (pgtable_l4_enabled) {
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unsigned long pfn = virt_to_pfn(pud);
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set_p4d_safe(p4d,
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__p4d((pfn << _PAGE_PFN_SHIFT) | _PAGE_TABLE));
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}
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}
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static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, p4d_t *p4d)
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{
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if (pgtable_l5_enabled) {
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unsigned long pfn = virt_to_pfn(p4d);
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set_pgd(pgd, __pgd((pfn << _PAGE_PFN_SHIFT) | _PAGE_TABLE));
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}
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}
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static inline void pgd_populate_safe(struct mm_struct *mm, pgd_t *pgd,
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p4d_t *p4d)
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{
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if (pgtable_l5_enabled) {
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unsigned long pfn = virt_to_pfn(p4d);
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set_pgd_safe(pgd,
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__pgd((pfn << _PAGE_PFN_SHIFT) | _PAGE_TABLE));
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}
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}
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#define pud_alloc_one pud_alloc_one
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static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
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{
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if (pgtable_l4_enabled)
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return __pud_alloc_one(mm, addr);
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return NULL;
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}
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#define pud_free pud_free
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static inline void pud_free(struct mm_struct *mm, pud_t *pud)
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{
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if (pgtable_l4_enabled)
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__pud_free(mm, pud);
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}
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#define __pud_free_tlb(tlb, pud, addr) pud_free((tlb)->mm, pud)
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#define p4d_alloc_one p4d_alloc_one
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static inline p4d_t *p4d_alloc_one(struct mm_struct *mm, unsigned long addr)
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{
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if (pgtable_l5_enabled) {
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gfp_t gfp = GFP_PGTABLE_USER;
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if (mm == &init_mm)
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gfp = GFP_PGTABLE_KERNEL;
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return (p4d_t *)get_zeroed_page(gfp);
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}
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return NULL;
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}
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static inline void __p4d_free(struct mm_struct *mm, p4d_t *p4d)
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{
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BUG_ON((unsigned long)p4d & (PAGE_SIZE-1));
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free_page((unsigned long)p4d);
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}
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#define p4d_free p4d_free
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static inline void p4d_free(struct mm_struct *mm, p4d_t *p4d)
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{
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if (pgtable_l5_enabled)
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__p4d_free(mm, p4d);
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}
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#define __p4d_free_tlb(tlb, p4d, addr) p4d_free((tlb)->mm, p4d)
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#endif /* __PAGETABLE_PMD_FOLDED */
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static inline void sync_kernel_mappings(pgd_t *pgd)
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{
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memcpy(pgd + USER_PTRS_PER_PGD,
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init_mm.pgd + USER_PTRS_PER_PGD,
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(PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
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}
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static inline pgd_t *pgd_alloc(struct mm_struct *mm)
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{
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pgd_t *pgd;
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pgd = (pgd_t *)__get_free_page(GFP_KERNEL);
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if (likely(pgd != NULL)) {
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memset(pgd, 0, USER_PTRS_PER_PGD * sizeof(pgd_t));
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/* Copy kernel mappings */
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sync_kernel_mappings(pgd);
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}
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return pgd;
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}
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#ifndef __PAGETABLE_PMD_FOLDED
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#define __pmd_free_tlb(tlb, pmd, addr) pmd_free((tlb)->mm, pmd)
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#endif /* __PAGETABLE_PMD_FOLDED */
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#define __pte_free_tlb(tlb, pte, buf) \
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do { \
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pgtable_pte_page_dtor(pte); \
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tlb_remove_page((tlb), pte); \
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} while (0)
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#endif /* CONFIG_MMU */
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#endif /* _ASM_RISCV_PGALLOC_H */
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