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d7917ba705
total_lowmem represents the amount of low memory, not the physical address that low memory ends at. If the start of memory is at 0 it happens that total_lowmem can be used as both the size and the address that lowmem ends at (or more specifically one byte beyond the end). To make the code a bit more clear and deal with the case when the start of memory isn't at physical 0, we introduce lowmem_end_addr that represents one byte beyond the last physical address in the lowmem region. Signed-off-by: Kumar Gala <galak@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
248 lines
6.4 KiB
C
248 lines
6.4 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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#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/lmb.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/system.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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#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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/* max amount of RAM to use */
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unsigned long __max_memory;
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phys_addr_t memstart_addr;
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void free_initmem(void)
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{
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unsigned long addr;
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addr = (unsigned long)__init_begin;
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for (; addr < (unsigned long)__init_end; addr += PAGE_SIZE) {
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memset((void *)addr, POISON_FREE_INITMEM, PAGE_SIZE);
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ClearPageReserved(virt_to_page(addr));
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init_page_count(virt_to_page(addr));
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free_page(addr);
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totalram_pages++;
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}
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printk ("Freeing unused kernel memory: %luk freed\n",
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((unsigned long)__init_end - (unsigned long)__init_begin) >> 10);
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}
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#ifdef CONFIG_BLK_DEV_INITRD
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void free_initrd_mem(unsigned long start, unsigned long end)
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{
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if (start < end)
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printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
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for (; start < end; start += PAGE_SIZE) {
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ClearPageReserved(virt_to_page(start));
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init_page_count(virt_to_page(start));
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free_page(start);
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totalram_pages++;
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}
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}
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#endif
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#ifdef CONFIG_PROC_KCORE
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static struct kcore_list kcore_vmem;
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static int __init setup_kcore(void)
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{
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int i;
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for (i=0; i < lmb.memory.cnt; i++) {
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unsigned long base, size;
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struct kcore_list *kcore_mem;
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base = lmb.memory.region[i].base;
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size = lmb.memory.region[i].size;
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/* GFP_ATOMIC to avoid might_sleep warnings during boot */
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kcore_mem = kmalloc(sizeof(struct kcore_list), GFP_ATOMIC);
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if (!kcore_mem)
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panic("%s: kmalloc failed\n", __func__);
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kclist_add(kcore_mem, __va(base), size);
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}
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kclist_add(&kcore_vmem, (void *)VMALLOC_START, VMALLOC_END-VMALLOC_START);
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return 0;
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}
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module_init(setup_kcore);
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#endif
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static void zero_ctor(struct kmem_cache *cache, void *addr)
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{
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memset(addr, 0, kmem_cache_size(cache));
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}
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static const unsigned int pgtable_cache_size[2] = {
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PGD_TABLE_SIZE, PMD_TABLE_SIZE
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};
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static const char *pgtable_cache_name[ARRAY_SIZE(pgtable_cache_size)] = {
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#ifdef CONFIG_PPC_64K_PAGES
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"pgd_cache", "pmd_cache",
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#else
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"pgd_cache", "pud_pmd_cache",
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#endif /* CONFIG_PPC_64K_PAGES */
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};
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#ifdef CONFIG_HUGETLB_PAGE
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/* Hugepages need one extra cache, initialized in hugetlbpage.c. We
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* can't put into the tables above, because HPAGE_SHIFT is not compile
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* time constant. */
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struct kmem_cache *pgtable_cache[ARRAY_SIZE(pgtable_cache_size)+1];
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#else
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struct kmem_cache *pgtable_cache[ARRAY_SIZE(pgtable_cache_size)];
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#endif
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void pgtable_cache_init(void)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(pgtable_cache_size); i++) {
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int size = pgtable_cache_size[i];
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const char *name = pgtable_cache_name[i];
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pr_debug("Allocating page table cache %s (#%d) "
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"for size: %08x...\n", name, i, size);
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pgtable_cache[i] = kmem_cache_create(name,
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size, size,
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SLAB_PANIC,
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zero_ctor);
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}
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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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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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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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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 mode_rw;
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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_linear_psize].shift;
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mode_rw = _PAGE_ACCESSED | _PAGE_DIRTY | _PAGE_COHERENT | PP_RWXX;
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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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for (; start < end; start += page_size) {
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int mapped;
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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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pr_debug("vmemmap %08lx allocated at %p, physical %08lx.\n",
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start, p, __pa(p));
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mapped = htab_bolt_mapping(start, start + page_size,
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__pa(p), mode_rw, mmu_linear_psize,
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mmu_kernel_ssize);
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BUG_ON(mapped < 0);
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}
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return 0;
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}
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#endif
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