1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * fixmaps for parisc
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Copyright (c) 2019 Sven Schnelle <svens@stackframe.org>
6*4882a593Smuzhiyun */
7*4882a593Smuzhiyun
8*4882a593Smuzhiyun #include <linux/kprobes.h>
9*4882a593Smuzhiyun #include <linux/mm.h>
10*4882a593Smuzhiyun #include <asm/cacheflush.h>
11*4882a593Smuzhiyun #include <asm/fixmap.h>
12*4882a593Smuzhiyun
set_fixmap(enum fixed_addresses idx,phys_addr_t phys)13*4882a593Smuzhiyun void notrace set_fixmap(enum fixed_addresses idx, phys_addr_t phys)
14*4882a593Smuzhiyun {
15*4882a593Smuzhiyun unsigned long vaddr = __fix_to_virt(idx);
16*4882a593Smuzhiyun pgd_t *pgd = pgd_offset_k(vaddr);
17*4882a593Smuzhiyun p4d_t *p4d = p4d_offset(pgd, vaddr);
18*4882a593Smuzhiyun pud_t *pud = pud_offset(p4d, vaddr);
19*4882a593Smuzhiyun pmd_t *pmd = pmd_offset(pud, vaddr);
20*4882a593Smuzhiyun pte_t *pte;
21*4882a593Smuzhiyun
22*4882a593Smuzhiyun if (pmd_none(*pmd))
23*4882a593Smuzhiyun pte = pte_alloc_kernel(pmd, vaddr);
24*4882a593Smuzhiyun
25*4882a593Smuzhiyun pte = pte_offset_kernel(pmd, vaddr);
26*4882a593Smuzhiyun set_pte_at(&init_mm, vaddr, pte, __mk_pte(phys, PAGE_KERNEL_RWX));
27*4882a593Smuzhiyun flush_tlb_kernel_range(vaddr, vaddr + PAGE_SIZE);
28*4882a593Smuzhiyun }
29*4882a593Smuzhiyun
clear_fixmap(enum fixed_addresses idx)30*4882a593Smuzhiyun void notrace clear_fixmap(enum fixed_addresses idx)
31*4882a593Smuzhiyun {
32*4882a593Smuzhiyun unsigned long vaddr = __fix_to_virt(idx);
33*4882a593Smuzhiyun pte_t *pte = virt_to_kpte(vaddr);
34*4882a593Smuzhiyun
35*4882a593Smuzhiyun if (WARN_ON(pte_none(*pte)))
36*4882a593Smuzhiyun return;
37*4882a593Smuzhiyun
38*4882a593Smuzhiyun pte_clear(&init_mm, vaddr, pte);
39*4882a593Smuzhiyun
40*4882a593Smuzhiyun flush_tlb_kernel_range(vaddr, vaddr + PAGE_SIZE);
41*4882a593Smuzhiyun }
42