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44 lines
865 B
C
44 lines
865 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* PA-RISC KFENCE support.
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*
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* Copyright (C) 2021, Helge Deller <deller@gmx.de>
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*/
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#ifndef _ASM_PARISC_KFENCE_H
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#define _ASM_PARISC_KFENCE_H
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#include <linux/kfence.h>
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#include <asm/pgtable.h>
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#include <asm/tlbflush.h>
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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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/* Protect the given page and flush TLB. */
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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 *pte = virt_to_kpte(addr);
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if (WARN_ON(!pte))
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return false;
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/*
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* We need to avoid IPIs, as we may get KFENCE allocations or faults
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* with interrupts disabled.
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*/
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if (protect)
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set_pte(pte, __pte(pte_val(*pte) & ~_PAGE_PRESENT));
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else
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set_pte(pte, __pte(pte_val(*pte) | _PAGE_PRESENT));
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flush_tlb_kernel_range(addr, addr + PAGE_SIZE);
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return true;
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}
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#endif /* _ASM_PARISC_KFENCE_H */
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