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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>
#ifdef CONFIG_PPC64_ELF_ABI_V1
#define ARCH_FUNC_PREFIX "."
#endif
extern bool kfence_early_init;
extern bool kfence_disabled;
static inline void disable_kfence(void)
{
kfence_disabled = true;
}
static inline bool arch_kfence_init_pool(void)
{
return !kfence_disabled;
}
static inline bool kfence_early_init_enabled(void)
{
return IS_ENABLED(CONFIG_KFENCE) && kfence_early_init;
}
#ifdef CONFIG_PPC64
static inline bool kfence_protect_page(unsigned long addr, bool protect)
{
struct page *page = virt_to_page((void *)addr);
__kernel_map_pages(page, 1, !protect);
return true;
}
#else
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
#endif /* __ASM_POWERPC_KFENCE_H */
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