/* * PowerPC version * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) * * Modifications by Paul Mackerras (PowerMac) (paulus@cs.anu.edu.au) * and Cort Dougan (PReP) (cort@cs.nmt.edu) * Copyright (C) 1996 Paul Mackerras * * Derived from "arch/i386/mm/init.c" * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds * * Dave Engebretsen <engebret@us.ibm.com> * Rework for PPC64 port. * * 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. * */ #include <linux/signal.h> #include <linux/sched.h> #include <linux/kernel.h> #include <linux/errno.h> #include <linux/string.h> #include <linux/types.h> #include <linux/mman.h> #include <linux/mm.h> #include <linux/swap.h> #include <linux/stddef.h> #include <linux/vmalloc.h> #include <linux/init.h> #include <linux/delay.h> #include <linux/bootmem.h> #include <linux/highmem.h> #include <linux/idr.h> #include <linux/nodemask.h> #include <linux/module.h> #include <linux/poison.h> #include <asm/pgalloc.h> #include <asm/page.h> #include <asm/prom.h> #include <asm/lmb.h> #include <asm/rtas.h> #include <asm/io.h> #include <asm/mmu_context.h> #include <asm/pgtable.h> #include <asm/mmu.h> #include <asm/uaccess.h> #include <asm/smp.h> #include <asm/machdep.h> #include <asm/tlb.h> #include <asm/eeh.h> #include <asm/processor.h> #include <asm/mmzone.h> #include <asm/cputable.h> #include <asm/sections.h> #include <asm/system.h> #include <asm/iommu.h> #include <asm/abs_addr.h> #include <asm/vdso.h> #include "mmu_decl.h" #if PGTABLE_RANGE > USER_VSID_RANGE #warning Limited user VSID range means pagetable space is wasted #endif #if (TASK_SIZE_USER64 < PGTABLE_RANGE) && (TASK_SIZE_USER64 < USER_VSID_RANGE) #warning TASK_SIZE is smaller than it needs to be. #endif /* max amount of RAM to use */ unsigned long __max_memory; void free_initmem(void) { unsigned long addr; addr = (unsigned long)__init_begin; for (; addr < (unsigned long)__init_end; addr += PAGE_SIZE) { memset((void *)addr, POISON_FREE_INITMEM, PAGE_SIZE); ClearPageReserved(virt_to_page(addr)); init_page_count(virt_to_page(addr)); free_page(addr); totalram_pages++; } printk ("Freeing unused kernel memory: %luk freed\n", ((unsigned long)__init_end - (unsigned long)__init_begin) >> 10); } #ifdef CONFIG_BLK_DEV_INITRD void free_initrd_mem(unsigned long start, unsigned long end) { if (start < end) printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10); for (; start < end; start += PAGE_SIZE) { ClearPageReserved(virt_to_page(start)); init_page_count(virt_to_page(start)); free_page(start); totalram_pages++; } } #endif #ifdef CONFIG_PROC_KCORE static struct kcore_list kcore_vmem; static int __init setup_kcore(void) { int i; for (i=0; i < lmb.memory.cnt; i++) { unsigned long base, size; struct kcore_list *kcore_mem; base = lmb.memory.region[i].base; size = lmb.memory.region[i].size; /* GFP_ATOMIC to avoid might_sleep warnings during boot */ kcore_mem = kmalloc(sizeof(struct kcore_list), GFP_ATOMIC); if (!kcore_mem) panic("%s: kmalloc failed\n", __FUNCTION__); kclist_add(kcore_mem, __va(base), size); } kclist_add(&kcore_vmem, (void *)VMALLOC_START, VMALLOC_END-VMALLOC_START); return 0; } module_init(setup_kcore); #endif static void zero_ctor(struct kmem_cache *cache, void *addr) { memset(addr, 0, kmem_cache_size(cache)); } static const unsigned int pgtable_cache_size[2] = { PGD_TABLE_SIZE, PMD_TABLE_SIZE }; static const char *pgtable_cache_name[ARRAY_SIZE(pgtable_cache_size)] = { #ifdef CONFIG_PPC_64K_PAGES "pgd_cache", "pmd_cache", #else "pgd_cache", "pud_pmd_cache", #endif /* CONFIG_PPC_64K_PAGES */ }; #ifdef CONFIG_HUGETLB_PAGE /* Hugepages need one extra cache, initialized in hugetlbpage.c. We * can't put into the tables above, because HPAGE_SHIFT is not compile * time constant. */ struct kmem_cache *pgtable_cache[ARRAY_SIZE(pgtable_cache_size)+1]; #else struct kmem_cache *pgtable_cache[ARRAY_SIZE(pgtable_cache_size)]; #endif void pgtable_cache_init(void) { int i; for (i = 0; i < ARRAY_SIZE(pgtable_cache_size); i++) { int size = pgtable_cache_size[i]; const char *name = pgtable_cache_name[i]; pr_debug("Allocating page table cache %s (#%d) " "for size: %08x...\n", name, i, size); pgtable_cache[i] = kmem_cache_create(name, size, size, SLAB_PANIC, zero_ctor); } } #ifdef CONFIG_SPARSEMEM_VMEMMAP /* * Given an address within the vmemmap, determine the pfn of the page that * represents the start of the section it is within. Note that we have to * do this by hand as the proffered address may not be correctly aligned. * Subtraction of non-aligned pointers produces undefined results. */ unsigned long __meminit vmemmap_section_start(unsigned long page) { unsigned long offset = page - ((unsigned long)(vmemmap)); /* Return the pfn of the start of the section. */ return (offset / sizeof(struct page)) & PAGE_SECTION_MASK; } /* * Check if this vmemmap page is already initialised. If any section * which overlaps this vmemmap page is initialised then this page is * initialised already. */ int __meminit vmemmap_populated(unsigned long start, int page_size) { unsigned long end = start + page_size; for (; start < end; start += (PAGES_PER_SECTION * sizeof(struct page))) if (pfn_valid(vmemmap_section_start(start))) return 1; return 0; } int __meminit vmemmap_populate(struct page *start_page, unsigned long nr_pages, int node) { unsigned long mode_rw; unsigned long start = (unsigned long)start_page; unsigned long end = (unsigned long)(start_page + nr_pages); unsigned long page_size = 1 << mmu_psize_defs[mmu_linear_psize].shift; mode_rw = _PAGE_ACCESSED | _PAGE_DIRTY | _PAGE_COHERENT | PP_RWXX; /* Align to the page size of the linear mapping. */ start = _ALIGN_DOWN(start, page_size); for (; start < end; start += page_size) { int mapped; void *p; if (vmemmap_populated(start, page_size)) continue; p = vmemmap_alloc_block(page_size, node); if (!p) return -ENOMEM; pr_debug("vmemmap %08lx allocated at %p, physical %08lx.\n", start, p, __pa(p)); mapped = htab_bolt_mapping(start, start + page_size, __pa(p), mode_rw, mmu_linear_psize, mmu_kernel_ssize); BUG_ON(mapped < 0); } return 0; } #endif