303 lines
8.5 KiB
C
303 lines
8.5 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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*/
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#undef DEBUG
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#include <linux/signal.h>
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#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/string.h>
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#include <linux/types.h>
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#include <linux/mman.h>
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#include <linux/mm.h>
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#include <linux/swap.h>
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#include <linux/stddef.h>
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#include <linux/vmalloc.h>
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#include <linux/init.h>
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#include <linux/delay.h>
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#include <linux/bootmem.h>
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#include <linux/highmem.h>
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#include <linux/idr.h>
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#include <linux/nodemask.h>
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#include <linux/module.h>
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#include <linux/poison.h>
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#include <linux/memblock.h>
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#include <linux/hugetlb.h>
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#include <linux/slab.h>
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#include <asm/pgalloc.h>
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#include <asm/page.h>
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#include <asm/prom.h>
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#include <asm/rtas.h>
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#include <asm/io.h>
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#include <asm/mmu_context.h>
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#include <asm/pgtable.h>
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#include <asm/mmu.h>
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#include <asm/uaccess.h>
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#include <asm/smp.h>
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#include <asm/machdep.h>
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#include <asm/tlb.h>
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#include <asm/eeh.h>
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#include <asm/processor.h>
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#include <asm/mmzone.h>
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#include <asm/cputable.h>
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#include <asm/sections.h>
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#include <asm/iommu.h>
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#include <asm/abs_addr.h>
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#include <asm/vdso.h>
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#include "mmu_decl.h"
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#ifdef CONFIG_PPC_STD_MMU_64
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#if PGTABLE_RANGE > USER_VSID_RANGE
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#warning Limited user VSID range means pagetable space is wasted
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#endif
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#if (TASK_SIZE_USER64 < PGTABLE_RANGE) && (TASK_SIZE_USER64 < USER_VSID_RANGE)
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#warning TASK_SIZE is smaller than it needs to be.
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#endif
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#endif /* CONFIG_PPC_STD_MMU_64 */
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phys_addr_t memstart_addr = ~0;
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EXPORT_SYMBOL_GPL(memstart_addr);
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phys_addr_t kernstart_addr;
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EXPORT_SYMBOL_GPL(kernstart_addr);
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static void pgd_ctor(void *addr)
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{
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memset(addr, 0, PGD_TABLE_SIZE);
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}
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static void pmd_ctor(void *addr)
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{
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memset(addr, 0, PMD_TABLE_SIZE);
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}
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struct kmem_cache *pgtable_cache[MAX_PGTABLE_INDEX_SIZE];
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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 shift, void (*ctor)(void *))
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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 < 1) || (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);
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PGT_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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void pgtable_cache_init(void)
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{
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pgtable_cache_add(PGD_INDEX_SIZE, pgd_ctor);
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pgtable_cache_add(PMD_INDEX_SIZE, pmd_ctor);
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if (!PGT_CACHE(PGD_INDEX_SIZE) || !PGT_CACHE(PMD_INDEX_SIZE))
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panic("Couldn't allocate pgtable caches");
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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. Verify that the
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* initialization above has also created a PUD cache. This
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* will need re-examiniation if we add new possibilities for
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* the pagetable layout. */
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BUG_ON(PUD_INDEX_SIZE && !PGT_CACHE(PUD_INDEX_SIZE));
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}
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#ifdef CONFIG_SPARSEMEM_VMEMMAP
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/*
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* Given an address within the vmemmap, determine the pfn of the page that
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* represents the start of the section it is within. Note that we have to
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* do this by hand as the proffered address may not be correctly aligned.
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* Subtraction of non-aligned pointers produces undefined results.
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*/
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static unsigned long __meminit vmemmap_section_start(unsigned long page)
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{
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unsigned long offset = page - ((unsigned long)(vmemmap));
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/* Return the pfn of the start of the section. */
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return (offset / sizeof(struct page)) & PAGE_SECTION_MASK;
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}
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/*
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* Check if this vmemmap page is already initialised. If any section
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* which overlaps this vmemmap page is initialised then this page is
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* initialised already.
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*/
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static int __meminit vmemmap_populated(unsigned long start, int page_size)
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{
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unsigned long end = start + page_size;
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for (; start < end; start += (PAGES_PER_SECTION * sizeof(struct page)))
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if (pfn_valid(vmemmap_section_start(start)))
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return 1;
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return 0;
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}
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/* On hash-based CPUs, the vmemmap is bolted in the hash table.
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*
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* On Book3E CPUs, the vmemmap is currently mapped in the top half of
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* the vmalloc space using normal page tables, though the size of
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* pages encoded in the PTEs can be different
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*/
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#ifdef CONFIG_PPC_BOOK3E
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static void __meminit vmemmap_create_mapping(unsigned long start,
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unsigned long page_size,
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unsigned long phys)
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{
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/* Create a PTE encoding without page size */
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unsigned long i, flags = _PAGE_PRESENT | _PAGE_ACCESSED |
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_PAGE_KERNEL_RW;
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/* PTEs only contain page size encodings up to 32M */
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BUG_ON(mmu_psize_defs[mmu_vmemmap_psize].enc > 0xf);
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/* Encode the size in the PTE */
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flags |= mmu_psize_defs[mmu_vmemmap_psize].enc << 8;
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/* For each PTE for that area, map things. Note that we don't
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* increment phys because all PTEs are of the large size and
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* thus must have the low bits clear
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*/
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for (i = 0; i < page_size; i += PAGE_SIZE)
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BUG_ON(map_kernel_page(start + i, phys, flags));
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}
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#else /* CONFIG_PPC_BOOK3E */
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static void __meminit vmemmap_create_mapping(unsigned long start,
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unsigned long page_size,
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unsigned long phys)
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{
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int mapped = htab_bolt_mapping(start, start + page_size, phys,
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PAGE_KERNEL, mmu_vmemmap_psize,
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mmu_kernel_ssize);
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BUG_ON(mapped < 0);
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}
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#endif /* CONFIG_PPC_BOOK3E */
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struct vmemmap_backing *vmemmap_list;
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static __meminit struct vmemmap_backing * vmemmap_list_alloc(int node)
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{
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static struct vmemmap_backing *next;
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static int num_left;
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/* allocate a page when required and hand out chunks */
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if (!next || !num_left) {
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next = vmemmap_alloc_block(PAGE_SIZE, node);
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if (unlikely(!next)) {
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WARN_ON(1);
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return NULL;
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}
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num_left = PAGE_SIZE / sizeof(struct vmemmap_backing);
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}
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num_left--;
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return next++;
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}
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static __meminit void vmemmap_list_populate(unsigned long phys,
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unsigned long start,
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int node)
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{
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struct vmemmap_backing *vmem_back;
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vmem_back = vmemmap_list_alloc(node);
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if (unlikely(!vmem_back)) {
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WARN_ON(1);
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return;
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}
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vmem_back->phys = phys;
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vmem_back->virt_addr = start;
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vmem_back->list = vmemmap_list;
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vmemmap_list = vmem_back;
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}
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int __meminit vmemmap_populate(struct page *start_page,
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unsigned long nr_pages, int node)
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{
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unsigned long start = (unsigned long)start_page;
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unsigned long end = (unsigned long)(start_page + nr_pages);
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unsigned long page_size = 1 << mmu_psize_defs[mmu_vmemmap_psize].shift;
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/* Align to the page size of the linear mapping. */
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start = _ALIGN_DOWN(start, page_size);
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pr_debug("vmemmap_populate page %p, %ld pages, node %d\n",
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start_page, nr_pages, node);
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pr_debug(" -> map %lx..%lx\n", start, end);
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for (; start < end; start += page_size) {
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void *p;
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if (vmemmap_populated(start, page_size))
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continue;
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p = vmemmap_alloc_block(page_size, node);
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if (!p)
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return -ENOMEM;
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vmemmap_list_populate(__pa(p), start, node);
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pr_debug(" * %016lx..%016lx allocated at %p\n",
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start, start + page_size, p);
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vmemmap_create_mapping(start, page_size, __pa(p));
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}
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return 0;
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}
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#endif /* CONFIG_SPARSEMEM_VMEMMAP */
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