3 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
5 * Modifications by Paul Mackerras (PowerMac) (paulus@cs.anu.edu.au)
6 * and Cort Dougan (PReP) (cort@cs.nmt.edu)
7 * Copyright (C) 1996 Paul Mackerras
9 * Derived from "arch/i386/mm/init.c"
10 * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
12 * Dave Engebretsen <engebret@us.ibm.com>
13 * Rework for PPC64 port.
15 * This program is free software; you can redistribute it and/or
16 * modify it under the terms of the GNU General Public License
17 * as published by the Free Software Foundation; either version
18 * 2 of the License, or (at your option) any later version.
24 #include <linux/signal.h>
25 #include <linux/sched.h>
26 #include <linux/kernel.h>
27 #include <linux/errno.h>
28 #include <linux/string.h>
29 #include <linux/types.h>
30 #include <linux/mman.h>
32 #include <linux/swap.h>
33 #include <linux/stddef.h>
34 #include <linux/vmalloc.h>
35 #include <linux/init.h>
36 #include <linux/delay.h>
37 #include <linux/bootmem.h>
38 #include <linux/highmem.h>
39 #include <linux/idr.h>
40 #include <linux/nodemask.h>
41 #include <linux/module.h>
42 #include <linux/poison.h>
43 #include <linux/lmb.h>
45 #include <asm/pgalloc.h>
50 #include <asm/mmu_context.h>
51 #include <asm/pgtable.h>
53 #include <asm/uaccess.h>
55 #include <asm/machdep.h>
58 #include <asm/processor.h>
59 #include <asm/mmzone.h>
60 #include <asm/cputable.h>
61 #include <asm/sections.h>
62 #include <asm/system.h>
63 #include <asm/iommu.h>
64 #include <asm/abs_addr.h>
69 #if PGTABLE_RANGE > USER_VSID_RANGE
70 #warning Limited user VSID range means pagetable space is wasted
73 #if (TASK_SIZE_USER64 < PGTABLE_RANGE) && (TASK_SIZE_USER64 < USER_VSID_RANGE)
74 #warning TASK_SIZE is smaller than it needs to be.
77 phys_addr_t memstart_addr = ~0;
78 phys_addr_t kernstart_addr;
80 void free_initmem(void)
84 addr = (unsigned long)__init_begin;
85 for (; addr < (unsigned long)__init_end; addr += PAGE_SIZE) {
86 memset((void *)addr, POISON_FREE_INITMEM, PAGE_SIZE);
87 ClearPageReserved(virt_to_page(addr));
88 init_page_count(virt_to_page(addr));
92 printk ("Freeing unused kernel memory: %luk freed\n",
93 ((unsigned long)__init_end - (unsigned long)__init_begin) >> 10);
96 #ifdef CONFIG_BLK_DEV_INITRD
97 void free_initrd_mem(unsigned long start, unsigned long end)
100 printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
101 for (; start < end; start += PAGE_SIZE) {
102 ClearPageReserved(virt_to_page(start));
103 init_page_count(virt_to_page(start));
110 #ifdef CONFIG_PROC_KCORE
111 static struct kcore_list kcore_vmem;
113 static int __init setup_kcore(void)
117 for (i=0; i < lmb.memory.cnt; i++) {
118 unsigned long base, size;
119 struct kcore_list *kcore_mem;
121 base = lmb.memory.region[i].base;
122 size = lmb.memory.region[i].size;
124 /* GFP_ATOMIC to avoid might_sleep warnings during boot */
125 kcore_mem = kmalloc(sizeof(struct kcore_list), GFP_ATOMIC);
127 panic("%s: kmalloc failed\n", __func__);
129 kclist_add(kcore_mem, __va(base), size);
132 kclist_add(&kcore_vmem, (void *)VMALLOC_START, VMALLOC_END-VMALLOC_START);
136 module_init(setup_kcore);
139 static void pgd_ctor(void *addr)
141 memset(addr, 0, PGD_TABLE_SIZE);
144 static void pmd_ctor(void *addr)
146 memset(addr, 0, PMD_TABLE_SIZE);
149 static const unsigned int pgtable_cache_size[2] = {
150 PGD_TABLE_SIZE, PMD_TABLE_SIZE
152 static const char *pgtable_cache_name[ARRAY_SIZE(pgtable_cache_size)] = {
153 #ifdef CONFIG_PPC_64K_PAGES
154 "pgd_cache", "pmd_cache",
156 "pgd_cache", "pud_pmd_cache",
157 #endif /* CONFIG_PPC_64K_PAGES */
160 #ifdef CONFIG_HUGETLB_PAGE
161 /* Hugepages need an extra cache per hugepagesize, initialized in
162 * hugetlbpage.c. We can't put into the tables above, because HPAGE_SHIFT
163 * is not compile time constant. */
164 struct kmem_cache *pgtable_cache[ARRAY_SIZE(pgtable_cache_size)+MMU_PAGE_COUNT];
166 struct kmem_cache *pgtable_cache[ARRAY_SIZE(pgtable_cache_size)];
169 void pgtable_cache_init(void)
171 pgtable_cache[0] = kmem_cache_create(pgtable_cache_name[0], PGD_TABLE_SIZE, PGD_TABLE_SIZE, SLAB_PANIC, pgd_ctor);
172 pgtable_cache[1] = kmem_cache_create(pgtable_cache_name[1], PMD_TABLE_SIZE, PMD_TABLE_SIZE, SLAB_PANIC, pmd_ctor);
175 #ifdef CONFIG_SPARSEMEM_VMEMMAP
177 * Given an address within the vmemmap, determine the pfn of the page that
178 * represents the start of the section it is within. Note that we have to
179 * do this by hand as the proffered address may not be correctly aligned.
180 * Subtraction of non-aligned pointers produces undefined results.
182 static unsigned long __meminit vmemmap_section_start(unsigned long page)
184 unsigned long offset = page - ((unsigned long)(vmemmap));
186 /* Return the pfn of the start of the section. */
187 return (offset / sizeof(struct page)) & PAGE_SECTION_MASK;
191 * Check if this vmemmap page is already initialised. If any section
192 * which overlaps this vmemmap page is initialised then this page is
193 * initialised already.
195 static int __meminit vmemmap_populated(unsigned long start, int page_size)
197 unsigned long end = start + page_size;
199 for (; start < end; start += (PAGES_PER_SECTION * sizeof(struct page)))
200 if (pfn_valid(vmemmap_section_start(start)))
206 int __meminit vmemmap_populate(struct page *start_page,
207 unsigned long nr_pages, int node)
209 unsigned long start = (unsigned long)start_page;
210 unsigned long end = (unsigned long)(start_page + nr_pages);
211 unsigned long page_size = 1 << mmu_psize_defs[mmu_vmemmap_psize].shift;
213 /* Align to the page size of the linear mapping. */
214 start = _ALIGN_DOWN(start, page_size);
216 for (; start < end; start += page_size) {
220 if (vmemmap_populated(start, page_size))
223 p = vmemmap_alloc_block(page_size, node);
227 pr_debug("vmemmap %08lx allocated at %p, physical %08lx.\n",
230 mapped = htab_bolt_mapping(start, start + page_size, __pa(p),
231 PAGE_KERNEL, mmu_vmemmap_psize,
238 #endif /* CONFIG_SPARSEMEM_VMEMMAP */