mirror of https://gitee.com/openkylin/linux.git
45 lines
1.0 KiB
C
45 lines
1.0 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* fixmaps for parisc
|
|
*
|
|
* Copyright (c) 2019 Sven Schnelle <svens@stackframe.org>
|
|
*/
|
|
|
|
#include <linux/kprobes.h>
|
|
#include <linux/mm.h>
|
|
#include <asm/cacheflush.h>
|
|
#include <asm/fixmap.h>
|
|
|
|
void notrace set_fixmap(enum fixed_addresses idx, phys_addr_t phys)
|
|
{
|
|
unsigned long vaddr = __fix_to_virt(idx);
|
|
pgd_t *pgd = pgd_offset_k(vaddr);
|
|
p4d_t *p4d = p4d_offset(pgd, vaddr);
|
|
pud_t *pud = pud_offset(p4d, vaddr);
|
|
pmd_t *pmd = pmd_offset(pud, vaddr);
|
|
pte_t *pte;
|
|
|
|
if (pmd_none(*pmd))
|
|
pmd = pmd_alloc(NULL, pud, vaddr);
|
|
|
|
pte = pte_offset_kernel(pmd, vaddr);
|
|
if (pte_none(*pte))
|
|
pte = pte_alloc_kernel(pmd, vaddr);
|
|
|
|
set_pte_at(&init_mm, vaddr, pte, __mk_pte(phys, PAGE_KERNEL_RWX));
|
|
flush_tlb_kernel_range(vaddr, vaddr + PAGE_SIZE);
|
|
}
|
|
|
|
void notrace clear_fixmap(enum fixed_addresses idx)
|
|
{
|
|
unsigned long vaddr = __fix_to_virt(idx);
|
|
pte_t *pte = virt_to_kpte(vaddr);
|
|
|
|
if (WARN_ON(pte_none(*pte)))
|
|
return;
|
|
|
|
pte_clear(&init_mm, vaddr, pte);
|
|
|
|
flush_tlb_kernel_range(vaddr, vaddr + PAGE_SIZE);
|
|
}
|