| /* 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 */ |
