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* PowerPC version
* Copyright (C) 1995-1996 Gary Thomas (
* Modifications by Paul Mackerras (PowerMac) (
* and Cort Dougan (PReP) (
* Copyright (C) 1996 Paul Mackerras
* Derived from "arch/i386/mm/init.c"
* Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
* Dave Engebretsen <>
* 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.
#undef DEBUG
#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 <linux/lmb.h>
#include <asm/pgalloc.h>
#include <asm/page.h>
#include <asm/prom.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"
#warning Limited user VSID range means pagetable space is wasted
#warning TASK_SIZE is smaller than it needs to be.
#endif /* CONFIG_PPC_STD_MMU_64 */
phys_addr_t memstart_addr = ~0;
phys_addr_t kernstart_addr;
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);
printk ("Freeing unused kernel memory: %luk freed\n",
((unsigned long)__init_end - (unsigned long)__init_begin) >> 10);
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) {
static void pgd_ctor(void *addr)
memset(addr, 0, PGD_TABLE_SIZE);
static void pmd_ctor(void *addr)
memset(addr, 0, PMD_TABLE_SIZE);
static const unsigned int pgtable_cache_size[2] = {
static const char *pgtable_cache_name[ARRAY_SIZE(pgtable_cache_size)] = {
"pgd_cache", "pmd_cache",
"pgd_cache", "pud_pmd_cache",
#endif /* CONFIG_PPC_64K_PAGES */
/* Hugepages need an extra cache per hugepagesize, 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)+MMU_PAGE_COUNT];
struct kmem_cache *pgtable_cache[ARRAY_SIZE(pgtable_cache_size)];
void pgtable_cache_init(void)
pgtable_cache[0] = kmem_cache_create(pgtable_cache_name[0], PGD_TABLE_SIZE, PGD_TABLE_SIZE, SLAB_PANIC, pgd_ctor);
pgtable_cache[1] = kmem_cache_create(pgtable_cache_name[1], PMD_TABLE_SIZE, PMD_TABLE_SIZE, SLAB_PANIC, pmd_ctor);
* 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.
static 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.
static 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;
/* On hash-based CPUs, the vmemmap is bolted in the hash table.
* On Book3E CPUs, the vmemmap is currently mapped in the top half of
* the vmalloc space using normal page tables, though the size of
* pages encoded in the PTEs can be different
static void __meminit vmemmap_create_mapping(unsigned long start,
unsigned long page_size,
unsigned long phys)
/* Create a PTE encoding without page size */
unsigned long i, flags = _PAGE_PRESENT | _PAGE_ACCESSED |
/* PTEs only contain page size encodings up to 32M */
BUG_ON(mmu_psize_defs[mmu_vmemmap_psize].enc > 0xf);
/* Encode the size in the PTE */
flags |= mmu_psize_defs[mmu_vmemmap_psize].enc << 8;
/* For each PTE for that area, map things. Note that we don't
* increment phys because all PTEs are of the large size and
* thus must have the low bits clear
for (i = 0; i < page_size; i += PAGE_SIZE)
BUG_ON(map_kernel_page(start + i, phys, flags));
#else /* CONFIG_PPC_BOOK3E */
static void __meminit vmemmap_create_mapping(unsigned long start,
unsigned long page_size,
unsigned long phys)
int mapped = htab_bolt_mapping(start, start + page_size, phys,
PAGE_KERNEL, mmu_vmemmap_psize,
BUG_ON(mapped < 0);
#endif /* CONFIG_PPC_BOOK3E */
int __meminit vmemmap_populate(struct page *start_page,
unsigned long nr_pages, int node)
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_vmemmap_psize].shift;
/* Align to the page size of the linear mapping. */
start = _ALIGN_DOWN(start, page_size);
pr_debug("vmemmap_populate page %p, %ld pages, node %d\n",
start_page, nr_pages, node);
pr_debug(" -> map %lx..%lx\n", start, end);
for (; start < end; start += page_size) {
void *p;
if (vmemmap_populated(start, page_size))
p = vmemmap_alloc_block(page_size, node);
if (!p)
return -ENOMEM;
pr_debug(" * %016lx..%016lx allocated at %p\n",
start, start + page_size, p);
vmemmap_create_mapping(start, page_size, __pa(p));
return 0;