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, 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 | |
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(mm: &init_mm, addr: vaddr, ptep: pte); |
36 | |
37 | flush_tlb_kernel_range(start: vaddr, end: vaddr + PAGE_SIZE); |
38 | } |
39 | |