1ccfbc68dSSven Schnelle // SPDX-License-Identifier: GPL-2.0 2ccfbc68dSSven Schnelle /* 3ccfbc68dSSven Schnelle * fixmaps for parisc 4ccfbc68dSSven Schnelle * 5ccfbc68dSSven Schnelle * Copyright (c) 2019 Sven Schnelle <svens@stackframe.org> 6ccfbc68dSSven Schnelle */ 7ccfbc68dSSven Schnelle 8ccfbc68dSSven Schnelle #include <linux/kprobes.h> 9ccfbc68dSSven Schnelle #include <linux/mm.h> 10ccfbc68dSSven Schnelle #include <asm/cacheflush.h> 11ccfbc68dSSven Schnelle #include <asm/fixmap.h> 12ccfbc68dSSven Schnelle 136ca63662SSven Schnelle void notrace set_fixmap(enum fixed_addresses idx, phys_addr_t phys) 14ccfbc68dSSven Schnelle { 15ccfbc68dSSven Schnelle unsigned long vaddr = __fix_to_virt(idx); 16ccfbc68dSSven Schnelle pgd_t *pgd = pgd_offset_k(vaddr); 17d96885e2SMike Rapoport p4d_t *p4d = p4d_offset(pgd, vaddr); 18d96885e2SMike Rapoport pud_t *pud = pud_offset(p4d, vaddr); 19d96885e2SMike Rapoport pmd_t *pmd = pmd_offset(pud, vaddr); 20ccfbc68dSSven Schnelle pte_t *pte; 21ccfbc68dSSven Schnelle 22ccfbc68dSSven Schnelle if (pmd_none(*pmd)) 23ccfbc68dSSven Schnelle pte = pte_alloc_kernel(pmd, vaddr); 24ccfbc68dSSven Schnelle 25*6e866a46SHelge Deller pte = pte_offset_kernel(pmd, vaddr); 26ccfbc68dSSven Schnelle set_pte_at(&init_mm, vaddr, pte, __mk_pte(phys, PAGE_KERNEL_RWX)); 27ccfbc68dSSven Schnelle flush_tlb_kernel_range(vaddr, vaddr + PAGE_SIZE); 28ccfbc68dSSven Schnelle } 29ccfbc68dSSven Schnelle 306ca63662SSven Schnelle void notrace clear_fixmap(enum fixed_addresses idx) 31ccfbc68dSSven Schnelle { 32ccfbc68dSSven Schnelle unsigned long vaddr = __fix_to_virt(idx); 33e05c7b1fSMike Rapoport pte_t *pte = virt_to_kpte(vaddr); 34ccfbc68dSSven Schnelle 35e4eab1ceSSven Schnelle if (WARN_ON(pte_none(*pte))) 36e4eab1ceSSven Schnelle return; 37e4eab1ceSSven Schnelle 38ccfbc68dSSven Schnelle pte_clear(&init_mm, vaddr, pte); 39ccfbc68dSSven Schnelle 40ccfbc68dSSven Schnelle flush_tlb_kernel_range(vaddr, vaddr + PAGE_SIZE); 41ccfbc68dSSven Schnelle } 42