1ccfbc68dSSven Schnelle // SPDX-License-Identifier: GPL-2.0
2ccfbc68dSSven Schnelle /*
3ccfbc68dSSven Schnelle * fixmaps for parisc
4ccfbc68dSSven Schnelle *
5ccfbc68dSSven Schnelle * Copyright (c) 2019 Sven Schnelle <svens@stackframe.org>
6ccfbc68dSSven Schnelle */
7ccfbc68dSSven Schnelle
8ccfbc68dSSven Schnelle #include <linux/kprobes.h>
9ccfbc68dSSven Schnelle #include <linux/mm.h>
10ccfbc68dSSven Schnelle #include <asm/cacheflush.h>
11ccfbc68dSSven Schnelle #include <asm/fixmap.h>
12ccfbc68dSSven Schnelle
set_fixmap(enum fixed_addresses idx,phys_addr_t phys)136ca63662SSven Schnelle void notrace set_fixmap(enum fixed_addresses idx, phys_addr_t phys)
14ccfbc68dSSven Schnelle {
15ccfbc68dSSven Schnelle unsigned long vaddr = __fix_to_virt(idx);
16ccfbc68dSSven Schnelle pgd_t *pgd = pgd_offset_k(vaddr);
17d96885e2SMike Rapoport p4d_t *p4d = p4d_offset(pgd, vaddr);
18d96885e2SMike Rapoport pud_t *pud = pud_offset(p4d, vaddr);
19d96885e2SMike Rapoport pmd_t *pmd = pmd_offset(pud, vaddr);
20ccfbc68dSSven Schnelle pte_t *pte;
21ccfbc68dSSven Schnelle
22*6e866a46SHelge Deller pte = pte_offset_kernel(pmd, vaddr);
23ccfbc68dSSven Schnelle set_pte_at(&init_mm, vaddr, pte, __mk_pte(phys, PAGE_KERNEL_RWX));
24ccfbc68dSSven Schnelle flush_tlb_kernel_range(vaddr, vaddr + PAGE_SIZE);
25ccfbc68dSSven Schnelle }
26ccfbc68dSSven Schnelle
clear_fixmap(enum fixed_addresses idx)276ca63662SSven Schnelle void notrace clear_fixmap(enum fixed_addresses idx)
28ccfbc68dSSven Schnelle {
29ccfbc68dSSven Schnelle unsigned long vaddr = __fix_to_virt(idx);
30e05c7b1fSMike Rapoport pte_t *pte = virt_to_kpte(vaddr);
31ccfbc68dSSven Schnelle
32e4eab1ceSSven Schnelle if (WARN_ON(pte_none(*pte)))
33e4eab1ceSSven Schnelle return;
34e4eab1ceSSven Schnelle
35ccfbc68dSSven Schnelle pte_clear(&init_mm, vaddr, pte);
36ccfbc68dSSven Schnelle
37ccfbc68dSSven Schnelle flush_tlb_kernel_range(vaddr, vaddr + PAGE_SIZE);
38ccfbc68dSSven Schnelle }
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