49 lines
925 B
C
49 lines
925 B
C
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/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* powerpc KFENCE support.
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*
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* Copyright (C) 2020 CS GROUP France
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*/
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#ifndef __ASM_POWERPC_KFENCE_H
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#define __ASM_POWERPC_KFENCE_H
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#include <linux/mm.h>
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#include <asm/pgtable.h>
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#ifdef CONFIG_PPC64_ELF_ABI_V1
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#define ARCH_FUNC_PREFIX "."
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#endif
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static inline bool arch_kfence_init_pool(void)
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{
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return true;
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}
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#ifdef CONFIG_PPC64
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static inline bool kfence_protect_page(unsigned long addr, bool protect)
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{
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struct page *page = virt_to_page(addr);
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__kernel_map_pages(page, 1, !protect);
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return true;
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}
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#else
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static inline bool kfence_protect_page(unsigned long addr, bool protect)
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{
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pte_t *kpte = virt_to_kpte(addr);
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if (protect) {
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pte_update(&init_mm, addr, kpte, _PAGE_PRESENT, 0, 0);
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flush_tlb_kernel_range(addr, addr + PAGE_SIZE);
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} else {
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pte_update(&init_mm, addr, kpte, 0, _PAGE_PRESENT, 0);
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}
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return true;
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}
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#endif
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#endif /* __ASM_POWERPC_KFENCE_H */
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