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