/* 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 */