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 13ccfbc68dSSven Schnelle void 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); 17ccfbc68dSSven Schnelle pmd_t *pmd = pmd_offset(pgd, vaddr); 18ccfbc68dSSven Schnelle pte_t *pte; 19ccfbc68dSSven Schnelle 20ccfbc68dSSven Schnelle if (pmd_none(*pmd)) 21ccfbc68dSSven Schnelle pmd = pmd_alloc(NULL, pgd, vaddr); 22ccfbc68dSSven Schnelle 23ccfbc68dSSven Schnelle pte = pte_offset_kernel(pmd, vaddr); 24ccfbc68dSSven Schnelle if (pte_none(*pte)) 25ccfbc68dSSven Schnelle pte = pte_alloc_kernel(pmd, vaddr); 26ccfbc68dSSven Schnelle 27ccfbc68dSSven Schnelle set_pte_at(&init_mm, vaddr, pte, __mk_pte(phys, PAGE_KERNEL_RWX)); 28ccfbc68dSSven Schnelle flush_tlb_kernel_range(vaddr, vaddr + PAGE_SIZE); 29ccfbc68dSSven Schnelle } 30ccfbc68dSSven Schnelle 31ccfbc68dSSven Schnelle void clear_fixmap(enum fixed_addresses idx) 32ccfbc68dSSven Schnelle { 33ccfbc68dSSven Schnelle unsigned long vaddr = __fix_to_virt(idx); 34ccfbc68dSSven Schnelle pgd_t *pgd = pgd_offset_k(vaddr); 35ccfbc68dSSven Schnelle pmd_t *pmd = pmd_offset(pgd, vaddr); 36ccfbc68dSSven Schnelle pte_t *pte = pte_offset_kernel(pmd, vaddr); 37ccfbc68dSSven Schnelle 38e4eab1ceSSven Schnelle if (WARN_ON(pte_none(*pte))) 39e4eab1ceSSven Schnelle return; 40e4eab1ceSSven Schnelle 41ccfbc68dSSven Schnelle pte_clear(&init_mm, vaddr, pte); 42ccfbc68dSSven Schnelle 43ccfbc68dSSven Schnelle flush_tlb_kernel_range(vaddr, vaddr + PAGE_SIZE); 44ccfbc68dSSven Schnelle } 45