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There are many platforms with exact same value for VM_DATA_DEFAULT_FLAGS This creates a default value for VM_DATA_DEFAULT_FLAGS in line with the existing VM_STACK_DEFAULT_FLAGS. While here, also define some more macros with standard VMA access flag combinations that are used frequently across many platforms. Apart from simplification, this reduces code duplication as well. Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Reviewed-by: Vlastimil Babka <vbabka@suse.cz> Acked-by: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Richard Henderson <rth@twiddle.net> Cc: Vineet Gupta <vgupta@synopsys.com> Cc: Russell King <linux@armlinux.org.uk> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Mark Salter <msalter@redhat.com> Cc: Guo Ren <guoren@kernel.org> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Cc: Brian Cain <bcain@codeaurora.org> Cc: Tony Luck <tony.luck@intel.com> Cc: Michal Simek <monstr@monstr.eu> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Paul Burton <paulburton@kernel.org> Cc: Nick Hu <nickhu@andestech.com> Cc: Ley Foon Tan <ley.foon.tan@intel.com> Cc: Jonas Bonn <jonas@southpole.se> Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Paul Walmsley <paul.walmsley@sifive.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Rich Felker <dalias@libc.org> Cc: "David S. Miller" <davem@davemloft.net> Cc: Guan Xuetao <gxt@pku.edu.cn> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Jeff Dike <jdike@addtoit.com> Cc: Chris Zankel <chris@zankel.net> Link: http://lkml.kernel.org/r/1583391014-8170-2-git-send-email-anshuman.khandual@arm.com Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
107 lines
2.7 KiB
C
107 lines
2.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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#ifndef _ASM_POWERPC_PAGE_64_H
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#define _ASM_POWERPC_PAGE_64_H
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/*
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* Copyright (C) 2001 PPC64 Team, IBM Corp
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*/
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#include <asm/asm-const.h>
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/*
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* We always define HW_PAGE_SHIFT to 12 as use of 64K pages remains Linux
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* specific, every notion of page number shared with the firmware, TCEs,
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* iommu, etc... still uses a page size of 4K.
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*/
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#define HW_PAGE_SHIFT 12
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#define HW_PAGE_SIZE (ASM_CONST(1) << HW_PAGE_SHIFT)
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#define HW_PAGE_MASK (~(HW_PAGE_SIZE-1))
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/*
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* PAGE_FACTOR is the number of bits factor between PAGE_SHIFT and
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* HW_PAGE_SHIFT, that is 4K pages.
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*/
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#define PAGE_FACTOR (PAGE_SHIFT - HW_PAGE_SHIFT)
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/* Segment size; normal 256M segments */
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#define SID_SHIFT 28
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#define SID_MASK ASM_CONST(0xfffffffff)
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#define ESID_MASK 0xfffffffff0000000UL
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#define GET_ESID(x) (((x) >> SID_SHIFT) & SID_MASK)
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/* 1T segments */
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#define SID_SHIFT_1T 40
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#define SID_MASK_1T 0xffffffUL
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#define ESID_MASK_1T 0xffffff0000000000UL
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#define GET_ESID_1T(x) (((x) >> SID_SHIFT_1T) & SID_MASK_1T)
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#ifndef __ASSEMBLY__
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#include <asm/cache.h>
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typedef unsigned long pte_basic_t;
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static inline void clear_page(void *addr)
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{
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unsigned long iterations;
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unsigned long onex, twox, fourx, eightx;
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iterations = ppc64_caches.l1d.blocks_per_page / 8;
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/*
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* Some verisions of gcc use multiply instructions to
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* calculate the offsets so lets give it a hand to
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* do better.
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*/
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onex = ppc64_caches.l1d.block_size;
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twox = onex << 1;
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fourx = onex << 2;
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eightx = onex << 3;
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asm volatile(
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"mtctr %1 # clear_page\n\
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.balign 16\n\
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1: dcbz 0,%0\n\
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dcbz %3,%0\n\
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dcbz %4,%0\n\
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dcbz %5,%0\n\
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dcbz %6,%0\n\
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dcbz %7,%0\n\
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dcbz %8,%0\n\
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dcbz %9,%0\n\
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add %0,%0,%10\n\
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bdnz+ 1b"
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: "=&r" (addr)
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: "r" (iterations), "0" (addr), "b" (onex), "b" (twox),
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"b" (twox+onex), "b" (fourx), "b" (fourx+onex),
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"b" (twox+fourx), "b" (eightx-onex), "r" (eightx)
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: "ctr", "memory");
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}
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extern void copy_page(void *to, void *from);
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/* Log 2 of page table size */
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extern u64 ppc64_pft_size;
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#endif /* __ASSEMBLY__ */
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#define VM_DATA_DEFAULT_FLAGS \
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(is_32bit_task() ? \
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VM_DATA_DEFAULT_FLAGS32 : VM_DATA_DEFAULT_FLAGS64)
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/*
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* This is the default if a program doesn't have a PT_GNU_STACK
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* program header entry. The PPC64 ELF ABI has a non executable stack
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* stack by default, so in the absence of a PT_GNU_STACK program header
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* we turn execute permission off.
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*/
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#define VM_STACK_DEFAULT_FLAGS32 VM_DATA_FLAGS_EXEC
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#define VM_STACK_DEFAULT_FLAGS64 VM_DATA_FLAGS_NON_EXEC
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#define VM_STACK_DEFAULT_FLAGS \
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(is_32bit_task() ? \
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VM_STACK_DEFAULT_FLAGS32 : VM_STACK_DEFAULT_FLAGS64)
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#include <asm-generic/getorder.h>
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#endif /* _ASM_POWERPC_PAGE_64_H */
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