mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-13 22:25:03 +00:00
e05c7b1f2b
The powerpc 32-bit implementation of pgtable has nice shortcuts for accessing kernel PMD and PTE for a given virtual address. Make these helpers available for all architectures. [rppt@linux.ibm.com: microblaze: fix page table traversal in setup_rt_frame()] Link: http://lkml.kernel.org/r/20200518191511.GD1118872@kernel.org [akpm@linux-foundation.org: s/pmd_ptr_k/pmd_off_k/ in various powerpc places] Signed-off-by: Mike Rapoport <rppt@linux.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Cain <bcain@codeaurora.org> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Chris Zankel <chris@zankel.net> Cc: "David S. Miller" <davem@davemloft.net> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Greentime Hu <green.hu@gmail.com> Cc: Greg Ungerer <gerg@linux-m68k.org> Cc: Guan Xuetao <gxt@pku.edu.cn> Cc: Guo Ren <guoren@kernel.org> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Helge Deller <deller@gmx.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: Ley Foon Tan <ley.foon.tan@intel.com> Cc: Mark Salter <msalter@redhat.com> Cc: Matthew Wilcox <willy@infradead.org> Cc: Matt Turner <mattst88@gmail.com> Cc: Max Filippov <jcmvbkbc@gmail.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Michal Simek <monstr@monstr.eu> Cc: Nick Hu <nickhu@andestech.com> Cc: Paul Walmsley <paul.walmsley@sifive.com> Cc: Richard Weinberger <richard@nod.at> Cc: Rich Felker <dalias@libc.org> Cc: Russell King <linux@armlinux.org.uk> Cc: Stafford Horne <shorne@gmail.com> Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Tony Luck <tony.luck@intel.com> Cc: Vincent Chen <deanbo422@gmail.com> Cc: Vineet Gupta <vgupta@synopsys.com> Cc: Will Deacon <will@kernel.org> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Link: http://lkml.kernel.org/r/20200514170327.31389-9-rppt@kernel.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
44 lines
1 KiB
C
44 lines
1 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);
|
|
}
|