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