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91a8da021c
This enables ARCH_HAS_VM_GET_PAGE_PROT on the platform and exports standard vm_get_page_prot() implementation via DECLARE_VM_GET_PAGE_PROT, which looks up a private and static protection_map[] array. Subsequently all __SXXX and __PXXX macros can be dropped which are no longer needed. Link: https://lkml.kernel.org/r/20220711070600.2378316-25-anshuman.khandual@arm.com Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com> Cc: Jeff Dike <jdike@addtoit.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Brian Cain <bcain@quicinc.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Christophe Leroy <christophe.leroy@csgroup.eu> Cc: Christoph Hellwig <hch@infradead.org> Cc: Christoph Hellwig <hch@lst.de> Cc: Chris Zankel <chris@zankel.net> Cc: "David S. Miller" <davem@davemloft.net> Cc: Dinh Nguyen <dinguyen@kernel.org> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Guo Ren <guoren@kernel.org> Cc: Heiko Carstens <hca@linux.ibm.com> Cc: Huacai Chen <chenhuacai@kernel.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com> Cc: Jonas Bonn <jonas@southpole.se> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Michal Simek <monstr@monstr.eu> Cc: Nicholas Piggin <npiggin@gmail.com> Cc: Palmer Dabbelt <palmer@dabbelt.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Paul Walmsley <paul.walmsley@sifive.com> Cc: Richard Henderson <rth@twiddle.net> Cc: Rich Felker <dalias@libc.org> Cc: Russell King <linux@armlinux.org.uk> Cc: Sam Ravnborg <sam@ravnborg.org> Cc: Stafford Horne <shorne@gmail.com> Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Vasily Gorbik <gor@linux.ibm.com> Cc: Vineet Gupta <vgupta@kernel.org> Cc: WANG Xuerui <kernel@xen0n.name> Cc: Will Deacon <will@kernel.org> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
50 lines
1,001 B
C
50 lines
1,001 B
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2011 Richard Weinberger <richrd@nod.at>
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*/
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#include <linux/mm.h>
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#include <asm/elf.h>
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static struct vm_area_struct gate_vma;
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static int __init gate_vma_init(void)
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{
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if (!FIXADDR_USER_START)
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return 0;
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vma_init(&gate_vma, NULL);
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gate_vma.vm_start = FIXADDR_USER_START;
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gate_vma.vm_end = FIXADDR_USER_END;
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gate_vma.vm_flags = VM_READ | VM_MAYREAD | VM_EXEC | VM_MAYEXEC;
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gate_vma.vm_page_prot = PAGE_READONLY;
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return 0;
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}
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__initcall(gate_vma_init);
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struct vm_area_struct *get_gate_vma(struct mm_struct *mm)
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{
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return FIXADDR_USER_START ? &gate_vma : NULL;
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}
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int in_gate_area_no_mm(unsigned long addr)
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{
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if (!FIXADDR_USER_START)
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return 0;
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if ((addr >= FIXADDR_USER_START) && (addr < FIXADDR_USER_END))
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return 1;
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return 0;
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}
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int in_gate_area(struct mm_struct *mm, unsigned long addr)
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{
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struct vm_area_struct *vma = get_gate_vma(mm);
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if (!vma)
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return 0;
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return (addr >= vma->vm_start) && (addr < vma->vm_end);
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}
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