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 p4d_t *p4d = p4d_offset(pgd, vaddr); 18 pud_t *pud = pud_offset(p4d, vaddr); 19 pmd_t *pmd = pmd_offset(pud, vaddr); 20 pte_t *pte; 21 22 if (pmd_none(*pmd)) 23 pmd = pmd_alloc(NULL, pud, vaddr); 24 25 pte = pte_offset_kernel(pmd, vaddr); 26 if (pte_none(*pte)) 27 pte = pte_alloc_kernel(pmd, vaddr); 28 29 set_pte_at(&init_mm, vaddr, pte, __mk_pte(phys, PAGE_KERNEL_RWX)); 30 flush_tlb_kernel_range(vaddr, vaddr + PAGE_SIZE); 31 } 32 33 void notrace clear_fixmap(enum fixed_addresses idx) 34 { 35 unsigned long vaddr = __fix_to_virt(idx); 36 pte_t *pte = virt_to_kpte(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