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
set_fixmap(enum fixed_addresses idx,phys_addr_t phys)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 pte = pte_offset_kernel(pmd, vaddr);
23 set_pte_at(&init_mm, vaddr, pte, __mk_pte(phys, PAGE_KERNEL_RWX));
24 flush_tlb_kernel_range(vaddr, vaddr + PAGE_SIZE);
25 }
26
clear_fixmap(enum fixed_addresses idx)27 void 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(&init_mm, vaddr, pte);
36
37 flush_tlb_kernel_range(vaddr, vaddr + PAGE_SIZE);
38 }
39