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
13void 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, address: vaddr);
18 pud_t *pud = pud_offset(p4d, address: vaddr);
19 pmd_t *pmd = pmd_offset(pud, address: vaddr);
20 pte_t *pte;
21
22 pte = pte_offset_kernel(pmd, address: vaddr);
23 set_pte_at(&init_mm, vaddr, pte, __mk_pte(phys, PAGE_KERNEL_RWX));
24 flush_tlb_kernel_range(start: vaddr, end: vaddr + PAGE_SIZE);
25}
26
27void notrace clear_fixmap(enum fixed_addresses idx)
28{
29 unsigned long vaddr = __fix_to_virt(idx);
30 pte_t *pte = virt_to_kpte(vaddr);
31
32 if (WARN_ON(pte_none(*pte)))
33 return;
34
35 pte_clear(mm: &init_mm, addr: vaddr, ptep: pte);
36
37 flush_tlb_kernel_range(start: vaddr, end: vaddr + PAGE_SIZE);
38}
39

source code of linux/arch/parisc/mm/fixmap.c