18c2ecf20Sopenharmony_ci// SPDX-License-Identifier: GPL-2.0 28c2ecf20Sopenharmony_ci/* 38c2ecf20Sopenharmony_ci * fixmaps for parisc 48c2ecf20Sopenharmony_ci * 58c2ecf20Sopenharmony_ci * Copyright (c) 2019 Sven Schnelle <svens@stackframe.org> 68c2ecf20Sopenharmony_ci */ 78c2ecf20Sopenharmony_ci 88c2ecf20Sopenharmony_ci#include <linux/kprobes.h> 98c2ecf20Sopenharmony_ci#include <linux/mm.h> 108c2ecf20Sopenharmony_ci#include <asm/cacheflush.h> 118c2ecf20Sopenharmony_ci#include <asm/fixmap.h> 128c2ecf20Sopenharmony_ci 138c2ecf20Sopenharmony_civoid notrace set_fixmap(enum fixed_addresses idx, phys_addr_t phys) 148c2ecf20Sopenharmony_ci{ 158c2ecf20Sopenharmony_ci unsigned long vaddr = __fix_to_virt(idx); 168c2ecf20Sopenharmony_ci pgd_t *pgd = pgd_offset_k(vaddr); 178c2ecf20Sopenharmony_ci p4d_t *p4d = p4d_offset(pgd, vaddr); 188c2ecf20Sopenharmony_ci pud_t *pud = pud_offset(p4d, vaddr); 198c2ecf20Sopenharmony_ci pmd_t *pmd = pmd_offset(pud, vaddr); 208c2ecf20Sopenharmony_ci pte_t *pte; 218c2ecf20Sopenharmony_ci 228c2ecf20Sopenharmony_ci if (pmd_none(*pmd)) 238c2ecf20Sopenharmony_ci pte = pte_alloc_kernel(pmd, vaddr); 248c2ecf20Sopenharmony_ci 258c2ecf20Sopenharmony_ci pte = pte_offset_kernel(pmd, vaddr); 268c2ecf20Sopenharmony_ci set_pte_at(&init_mm, vaddr, pte, __mk_pte(phys, PAGE_KERNEL_RWX)); 278c2ecf20Sopenharmony_ci flush_tlb_kernel_range(vaddr, vaddr + PAGE_SIZE); 288c2ecf20Sopenharmony_ci} 298c2ecf20Sopenharmony_ci 308c2ecf20Sopenharmony_civoid notrace clear_fixmap(enum fixed_addresses idx) 318c2ecf20Sopenharmony_ci{ 328c2ecf20Sopenharmony_ci unsigned long vaddr = __fix_to_virt(idx); 338c2ecf20Sopenharmony_ci pte_t *pte = virt_to_kpte(vaddr); 348c2ecf20Sopenharmony_ci 358c2ecf20Sopenharmony_ci if (WARN_ON(pte_none(*pte))) 368c2ecf20Sopenharmony_ci return; 378c2ecf20Sopenharmony_ci 388c2ecf20Sopenharmony_ci pte_clear(&init_mm, vaddr, pte); 398c2ecf20Sopenharmony_ci 408c2ecf20Sopenharmony_ci flush_tlb_kernel_range(vaddr, vaddr + PAGE_SIZE); 418c2ecf20Sopenharmony_ci} 42