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
8 * Amiga/APUS changes by Jesper Skov (jskov@cygnus.co.uk).
10 * Derived from "arch/i386/mm/init.c"
11 * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
13 * Dave Engebretsen <engebret@us.ibm.com>
14 * Rework for PPC64 port.
16 * This program is free software; you can redistribute it and/or
17 * modify it under the terms of the GNU General Public License
18 * as published by the Free Software Foundation; either version
19 * 2 of the License, or (at your option) any later version.
25 #include <linux/signal.h>
26 #include <linux/sched.h>
27 #include <linux/kernel.h>
28 #include <linux/errno.h>
29 #include <linux/string.h>
30 #include <linux/types.h>
31 #include <linux/mman.h>
33 #include <linux/swap.h>
34 #include <linux/stddef.h>
35 #include <linux/vmalloc.h>
36 #include <linux/init.h>
37 #include <linux/delay.h>
38 #include <linux/bootmem.h>
39 #include <linux/highmem.h>
40 #include <linux/idr.h>
41 #include <linux/nodemask.h>
42 #include <linux/module.h>
43 #include <linux/poison.h>
45 #include <asm/pgalloc.h>
51 #include <asm/mmu_context.h>
52 #include <asm/pgtable.h>
54 #include <asm/uaccess.h>
56 #include <asm/machdep.h>
59 #include <asm/processor.h>
60 #include <asm/mmzone.h>
61 #include <asm/cputable.h>
62 #include <asm/sections.h>
63 #include <asm/system.h>
64 #include <asm/iommu.h>
65 #include <asm/abs_addr.h>
71 #define DBG(fmt...) printk(fmt)
76 #if PGTABLE_RANGE > USER_VSID_RANGE
77 #warning Limited user VSID range means pagetable space is wasted
80 #if (TASK_SIZE_USER64 < PGTABLE_RANGE) && (TASK_SIZE_USER64 < USER_VSID_RANGE)
81 #warning TASK_SIZE is smaller than it needs to be.
84 /* max amount of RAM to use */
85 unsigned long __max_memory;
87 void free_initmem(void)
91 addr = (unsigned long)__init_begin;
92 for (; addr < (unsigned long)__init_end; addr += PAGE_SIZE) {
93 memset((void *)addr, POISON_FREE_INITMEM, PAGE_SIZE);
94 ClearPageReserved(virt_to_page(addr));
95 init_page_count(virt_to_page(addr));
99 printk ("Freeing unused kernel memory: %luk freed\n",
100 ((unsigned long)__init_end - (unsigned long)__init_begin) >> 10);
103 #ifdef CONFIG_BLK_DEV_INITRD
104 void free_initrd_mem(unsigned long start, unsigned long end)
107 printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
108 for (; start < end; start += PAGE_SIZE) {
109 ClearPageReserved(virt_to_page(start));
110 init_page_count(virt_to_page(start));
117 static struct kcore_list kcore_vmem;
119 static int __init setup_kcore(void)
123 for (i=0; i < lmb.memory.cnt; i++) {
124 unsigned long base, size;
125 struct kcore_list *kcore_mem;
127 base = lmb.memory.region[i].base;
128 size = lmb.memory.region[i].size;
130 /* GFP_ATOMIC to avoid might_sleep warnings during boot */
131 kcore_mem = kmalloc(sizeof(struct kcore_list), GFP_ATOMIC);
133 panic("%s: kmalloc failed\n", __FUNCTION__);
135 kclist_add(kcore_mem, __va(base), size);
138 kclist_add(&kcore_vmem, (void *)VMALLOC_START, VMALLOC_END-VMALLOC_START);
142 module_init(setup_kcore);
144 static void zero_ctor(void *addr, struct kmem_cache *cache, unsigned long flags)
146 memset(addr, 0, kmem_cache_size(cache));
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 one extra cache, initialized in hugetlbpage.c. We
162 * can't put into the tables above, because HPAGE_SHIFT is not compile
164 struct kmem_cache *pgtable_cache[ARRAY_SIZE(pgtable_cache_size)+1];
166 struct kmem_cache *pgtable_cache[ARRAY_SIZE(pgtable_cache_size)];
169 void pgtable_cache_init(void)
173 for (i = 0; i < ARRAY_SIZE(pgtable_cache_size); i++) {
174 int size = pgtable_cache_size[i];
175 const char *name = pgtable_cache_name[i];
177 DBG("Allocating page table cache %s (#%d) "
178 "for size: %08x...\n", name, i, size);
179 pgtable_cache[i] = kmem_cache_create(name,