forked from Minki/linux
2874c5fd28
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
145 lines
4.0 KiB
C
145 lines
4.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* PowerPC version
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* Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
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*
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* Modifications by Paul Mackerras (PowerMac) (paulus@cs.anu.edu.au)
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* and Cort Dougan (PReP) (cort@cs.nmt.edu)
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* Copyright (C) 1996 Paul Mackerras
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*
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* Derived from "arch/i386/mm/init.c"
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* Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
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*
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* Dave Engebretsen <engebret@us.ibm.com>
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* Rework for PPC64 port.
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*/
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#undef DEBUG
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#include <linux/string.h>
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#include <asm/pgalloc.h>
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#include <asm/pgtable.h>
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#include <asm/kup.h>
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static bool disable_kuep = !IS_ENABLED(CONFIG_PPC_KUEP);
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static bool disable_kuap = !IS_ENABLED(CONFIG_PPC_KUAP);
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static int __init parse_nosmep(char *p)
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{
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disable_kuep = true;
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pr_warn("Disabling Kernel Userspace Execution Prevention\n");
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return 0;
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}
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early_param("nosmep", parse_nosmep);
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static int __init parse_nosmap(char *p)
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{
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disable_kuap = true;
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pr_warn("Disabling Kernel Userspace Access Protection\n");
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return 0;
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}
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early_param("nosmap", parse_nosmap);
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void __ref setup_kup(void)
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{
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setup_kuep(disable_kuep);
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setup_kuap(disable_kuap);
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}
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#define CTOR(shift) static void ctor_##shift(void *addr) \
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{ \
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memset(addr, 0, sizeof(void *) << (shift)); \
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}
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CTOR(0); CTOR(1); CTOR(2); CTOR(3); CTOR(4); CTOR(5); CTOR(6); CTOR(7);
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CTOR(8); CTOR(9); CTOR(10); CTOR(11); CTOR(12); CTOR(13); CTOR(14); CTOR(15);
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static inline void (*ctor(int shift))(void *)
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{
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BUILD_BUG_ON(MAX_PGTABLE_INDEX_SIZE != 15);
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switch (shift) {
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case 0: return ctor_0;
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case 1: return ctor_1;
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case 2: return ctor_2;
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case 3: return ctor_3;
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case 4: return ctor_4;
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case 5: return ctor_5;
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case 6: return ctor_6;
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case 7: return ctor_7;
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case 8: return ctor_8;
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case 9: return ctor_9;
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case 10: return ctor_10;
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case 11: return ctor_11;
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case 12: return ctor_12;
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case 13: return ctor_13;
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case 14: return ctor_14;
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case 15: return ctor_15;
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}
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return NULL;
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}
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struct kmem_cache *pgtable_cache[MAX_PGTABLE_INDEX_SIZE + 1];
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EXPORT_SYMBOL_GPL(pgtable_cache); /* used by kvm_hv module */
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/*
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* Create a kmem_cache() for pagetables. This is not used for PTE
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* pages - they're linked to struct page, come from the normal free
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* pages pool and have a different entry size (see real_pte_t) to
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* everything else. Caches created by this function are used for all
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* the higher level pagetables, and for hugepage pagetables.
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*/
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void pgtable_cache_add(unsigned int shift)
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{
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char *name;
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unsigned long table_size = sizeof(void *) << shift;
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unsigned long align = table_size;
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/* When batching pgtable pointers for RCU freeing, we store
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* the index size in the low bits. Table alignment must be
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* big enough to fit it.
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*
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* Likewise, hugeapge pagetable pointers contain a (different)
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* shift value in the low bits. All tables must be aligned so
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* as to leave enough 0 bits in the address to contain it. */
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unsigned long minalign = max(MAX_PGTABLE_INDEX_SIZE + 1,
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HUGEPD_SHIFT_MASK + 1);
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struct kmem_cache *new;
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/* It would be nice if this was a BUILD_BUG_ON(), but at the
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* moment, gcc doesn't seem to recognize is_power_of_2 as a
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* constant expression, so so much for that. */
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BUG_ON(!is_power_of_2(minalign));
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BUG_ON(shift > MAX_PGTABLE_INDEX_SIZE);
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if (PGT_CACHE(shift))
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return; /* Already have a cache of this size */
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align = max_t(unsigned long, align, minalign);
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name = kasprintf(GFP_KERNEL, "pgtable-2^%d", shift);
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new = kmem_cache_create(name, table_size, align, 0, ctor(shift));
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if (!new)
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panic("Could not allocate pgtable cache for order %d", shift);
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kfree(name);
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pgtable_cache[shift] = new;
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pr_debug("Allocated pgtable cache for order %d\n", shift);
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}
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EXPORT_SYMBOL_GPL(pgtable_cache_add); /* used by kvm_hv module */
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void pgtable_cache_init(void)
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{
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pgtable_cache_add(PGD_INDEX_SIZE);
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if (PMD_CACHE_INDEX)
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pgtable_cache_add(PMD_CACHE_INDEX);
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/*
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* In all current configs, when the PUD index exists it's the
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* same size as either the pgd or pmd index except with THP enabled
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* on book3s 64
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*/
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if (PUD_CACHE_INDEX)
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pgtable_cache_add(PUD_CACHE_INDEX);
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}
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