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>
44 #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>
70 #define DBG(fmt...) printk(fmt)
75 #if PGTABLE_RANGE > USER_VSID_RANGE
76 #warning Limited user VSID range means pagetable space is wasted
79 #if (TASK_SIZE_USER64 < PGTABLE_RANGE) && (TASK_SIZE_USER64 < USER_VSID_RANGE)
80 #warning TASK_SIZE is smaller than it needs to be.
83 /* max amount of RAM to use */
84 unsigned long __max_memory;
86 void free_initmem(void)
90 addr = (unsigned long)__init_begin;
91 for (; addr < (unsigned long)__init_end; addr += PAGE_SIZE) {
92 memset((void *)addr, POISON_FREE_INITMEM, PAGE_SIZE);
93 ClearPageReserved(virt_to_page(addr));
94 init_page_count(virt_to_page(addr));
98 printk ("Freeing unused kernel memory: %luk freed\n",
99 ((unsigned long)__init_end - (unsigned long)__init_begin) >> 10);
102 #ifdef CONFIG_BLK_DEV_INITRD
103 void free_initrd_mem(unsigned long start, unsigned long end)
106 printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
107 for (; start < end; start += PAGE_SIZE) {
108 ClearPageReserved(virt_to_page(start));
109 init_page_count(virt_to_page(start));
116 static struct kcore_list kcore_vmem;
118 static int __init setup_kcore(void)
122 for (i=0; i < lmb.memory.cnt; i++) {
123 unsigned long base, size;
124 struct kcore_list *kcore_mem;
126 base = lmb.memory.region[i].base;
127 size = lmb.memory.region[i].size;
129 /* GFP_ATOMIC to avoid might_sleep warnings during boot */
130 kcore_mem = kmalloc(sizeof(struct kcore_list), GFP_ATOMIC);
132 panic("%s: kmalloc failed\n", __FUNCTION__);
134 kclist_add(kcore_mem, __va(base), size);
137 kclist_add(&kcore_vmem, (void *)VMALLOC_START, VMALLOC_END-VMALLOC_START);
141 module_init(setup_kcore);
143 static void zero_ctor(void *addr, struct kmem_cache *cache, unsigned long flags)
145 memset(addr, 0, kmem_cache_size(cache));
148 static const unsigned int pgtable_cache_size[2] = {
149 PGD_TABLE_SIZE, PMD_TABLE_SIZE
151 static const char *pgtable_cache_name[ARRAY_SIZE(pgtable_cache_size)] = {
152 #ifdef CONFIG_PPC_64K_PAGES
153 "pgd_cache", "pmd_cache",
155 "pgd_cache", "pud_pmd_cache",
156 #endif /* CONFIG_PPC_64K_PAGES */
159 #ifdef CONFIG_HUGETLB_PAGE
160 /* Hugepages need one extra cache, initialized in hugetlbpage.c. We
161 * can't put into the tables above, because HPAGE_SHIFT is not compile
163 struct kmem_cache *pgtable_cache[ARRAY_SIZE(pgtable_cache_size)+1];
165 struct kmem_cache *pgtable_cache[ARRAY_SIZE(pgtable_cache_size)];
168 void pgtable_cache_init(void)
172 for (i = 0; i < ARRAY_SIZE(pgtable_cache_size); i++) {
173 int size = pgtable_cache_size[i];
174 const char *name = pgtable_cache_name[i];
176 DBG("Allocating page table cache %s (#%d) "
177 "for size: %08x...\n", name, i, size);
178 pgtable_cache[i] = kmem_cache_create(name,