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145 lines
4.2 KiB
145 lines
4.2 KiB
// 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 ([email protected]) |
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* |
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* Modifications by Paul Mackerras (PowerMac) ([email protected]) |
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* and Cort Dougan (PReP) ([email protected]) |
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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 <[email protected]> |
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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 <linux/pgtable.h> |
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#include <asm/pgalloc.h> |
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#include <asm/kup.h> |
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phys_addr_t memstart_addr __ro_after_init = (phys_addr_t)~0ull; |
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EXPORT_SYMBOL_GPL(memstart_addr); |
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phys_addr_t kernstart_addr __ro_after_init; |
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EXPORT_SYMBOL_GPL(kernstart_addr); |
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unsigned long kernstart_virt_addr __ro_after_init = KERNELBASE; |
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EXPORT_SYMBOL_GPL(kernstart_virt_addr); |
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bool disable_kuep = !IS_ENABLED(CONFIG_PPC_KUEP); |
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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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#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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