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// 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);
pmd_t *pmd = pmd_offset(pgd, vaddr);
pte_t *pte;
if (pmd_none(*pmd))
pmd = pmd_alloc(NULL, pgd, 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);
pgd_t *pgd = pgd_offset_k(vaddr);
pmd_t *pmd = pmd_offset(pgd, vaddr);
pte_t *pte = pte_offset_kernel(pmd, vaddr);
if (WARN_ON(pte_none(*pte)))
return;
pte_clear(&init_mm, vaddr, pte);
flush_tlb_kernel_range(vaddr, vaddr + PAGE_SIZE);
}
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