45 lines
1.0 KiB
C
45 lines
1.0 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* fixmaps for parisc
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*
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* Copyright (c) 2019 Sven Schnelle <svens@stackframe.org>
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*/
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#include <linux/kprobes.h>
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#include <linux/mm.h>
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#include <asm/cacheflush.h>
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#include <asm/fixmap.h>
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void notrace set_fixmap(enum fixed_addresses idx, phys_addr_t phys)
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{
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unsigned long vaddr = __fix_to_virt(idx);
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pgd_t *pgd = pgd_offset_k(vaddr);
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pmd_t *pmd = pmd_offset(pgd, vaddr);
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pte_t *pte;
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if (pmd_none(*pmd))
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pmd = pmd_alloc(NULL, pgd, vaddr);
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pte = pte_offset_kernel(pmd, vaddr);
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if (pte_none(*pte))
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pte = pte_alloc_kernel(pmd, vaddr);
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set_pte_at(&init_mm, vaddr, pte, __mk_pte(phys, PAGE_KERNEL_RWX));
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flush_tlb_kernel_range(vaddr, vaddr + PAGE_SIZE);
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}
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void notrace clear_fixmap(enum fixed_addresses idx)
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{
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unsigned long vaddr = __fix_to_virt(idx);
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pgd_t *pgd = pgd_offset_k(vaddr);
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pmd_t *pmd = pmd_offset(pgd, vaddr);
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pte_t *pte = pte_offset_kernel(pmd, vaddr);
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if (WARN_ON(pte_none(*pte)))
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return;
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pte_clear(&init_mm, vaddr, pte);
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flush_tlb_kernel_range(vaddr, vaddr + PAGE_SIZE);
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}
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