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	pmd_t *pmd = pmd_offset(pgd, vaddr);
 
 
18	pte_t *pte;
19
20	if (pmd_none(*pmd))
21		pmd = pmd_alloc(NULL, pgd, vaddr);
22
23	pte = pte_offset_kernel(pmd, vaddr);
24	if (pte_none(*pte))
25		pte = pte_alloc_kernel(pmd, vaddr);
26
 
27	set_pte_at(&init_mm, vaddr, pte, __mk_pte(phys, PAGE_KERNEL_RWX));
28	flush_tlb_kernel_range(vaddr, vaddr + PAGE_SIZE);
29}
30
31void notrace clear_fixmap(enum fixed_addresses idx)
32{
33	unsigned long vaddr = __fix_to_virt(idx);
34	pgd_t *pgd = pgd_offset_k(vaddr);
35	pmd_t *pmd = pmd_offset(pgd, vaddr);
36	pte_t *pte = pte_offset_kernel(pmd, vaddr);
37
38	if (WARN_ON(pte_none(*pte)))
39		return;
40
41	pte_clear(&init_mm, vaddr, pte);
42
43	flush_tlb_kernel_range(vaddr, vaddr + PAGE_SIZE);
44}

 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, vaddr);
18	pud_t *pud = pud_offset(p4d, vaddr);
19	pmd_t *pmd = pmd_offset(pud, vaddr);
20	pte_t *pte;
21
22	if (pmd_none(*pmd))
 
 
 
 
23		pte = pte_alloc_kernel(pmd, vaddr);
24
25	pte = pte_offset_kernel(pmd, vaddr);
26	set_pte_at(&init_mm, vaddr, pte, __mk_pte(phys, PAGE_KERNEL_RWX));
27	flush_tlb_kernel_range(vaddr, vaddr + PAGE_SIZE);
28}
29
30void notrace clear_fixmap(enum fixed_addresses idx)
31{
32	unsigned long vaddr = __fix_to_virt(idx);
33	pte_t *pte = virt_to_kpte(vaddr);
 
 
34
35	if (WARN_ON(pte_none(*pte)))
36		return;
37
38	pte_clear(&init_mm, vaddr, pte);
39
40	flush_tlb_kernel_range(vaddr, vaddr + PAGE_SIZE);
41}