1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * fixmaps for parisc 4 * 5 * Copyright (c) 2019 Sven Schnelle <svens@stackframe.org> 6 */ 7 8 #include <linux/kprobes.h> 9 #include <linux/mm.h> 10 #include <asm/cacheflush.h> 11 #include <asm/fixmap.h> 12 13 void notrace set_fixmap(enum fixed_addresses idx, phys_addr_t phys) 14 { 15 unsigned long vaddr = __fix_to_virt(idx); 16 pgd_t *pgd = pgd_offset_k(vaddr); 17 pmd_t *pmd = pmd_offset(pgd, vaddr); 18 pte_t *pte; 19 20 if (pmd_none(*pmd)) 21 pmd = pmd_alloc(NULL, pgd, vaddr); 22 23 pte = pte_offset_kernel(pmd, vaddr); 24 if (pte_none(*pte)) 25 pte = pte_alloc_kernel(pmd, vaddr); 26 27 set_pte_at(&init_mm, vaddr, pte, __mk_pte(phys, PAGE_KERNEL_RWX)); 28 flush_tlb_kernel_range(vaddr, vaddr + PAGE_SIZE); 29 } 30 31 void notrace clear_fixmap(enum fixed_addresses idx) 32 { 33 unsigned long vaddr = __fix_to_virt(idx); 34 pgd_t *pgd = pgd_offset_k(vaddr); 35 pmd_t *pmd = pmd_offset(pgd, vaddr); 36 pte_t *pte = pte_offset_kernel(pmd, vaddr); 37 38 if (WARN_ON(pte_none(*pte))) 39 return; 40 41 pte_clear(&init_mm, vaddr, pte); 42 43 flush_tlb_kernel_range(vaddr, vaddr + PAGE_SIZE); 44 } 45