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/config.h>
26 #include <linux/signal.h>
27 #include <linux/sched.h>
28 #include <linux/kernel.h>
29 #include <linux/errno.h>
30 #include <linux/string.h>
31 #include <linux/types.h>
32 #include <linux/mman.h>
34 #include <linux/swap.h>
35 #include <linux/stddef.h>
36 #include <linux/vmalloc.h>
37 #include <linux/init.h>
38 #include <linux/delay.h>
39 #include <linux/bootmem.h>
40 #include <linux/highmem.h>
41 #include <linux/idr.h>
42 #include <linux/nodemask.h>
43 #include <linux/module.h>
44 #include <linux/poison.h>
46 #include <asm/pgalloc.h>
52 #include <asm/mmu_context.h>
53 #include <asm/pgtable.h>
55 #include <asm/uaccess.h>
57 #include <asm/machdep.h>
60 #include <asm/processor.h>
61 #include <asm/mmzone.h>
62 #include <asm/cputable.h>
63 #include <asm/sections.h>
64 #include <asm/system.h>
65 #include <asm/iommu.h>
66 #include <asm/abs_addr.h>
72 #define DBG(fmt...) printk(fmt)
77 #if PGTABLE_RANGE > USER_VSID_RANGE
78 #warning Limited user VSID range means pagetable space is wasted
81 #if (TASK_SIZE_USER64 < PGTABLE_RANGE) && (TASK_SIZE_USER64 < USER_VSID_RANGE)
82 #warning TASK_SIZE is smaller than it needs to be.
85 /* max amount of RAM to use */
86 unsigned long __max_memory
;
88 void free_initmem(void)
92 addr
= (unsigned long)__init_begin
;
93 for (; addr
< (unsigned long)__init_end
; addr
+= PAGE_SIZE
) {
94 memset((void *)addr
, POISON_FREE_INITMEM
, PAGE_SIZE
);
95 ClearPageReserved(virt_to_page(addr
));
96 init_page_count(virt_to_page(addr
));
100 printk ("Freeing unused kernel memory: %luk freed\n",
101 ((unsigned long)__init_end
- (unsigned long)__init_begin
) >> 10);
104 #ifdef CONFIG_BLK_DEV_INITRD
105 void free_initrd_mem(unsigned long start
, unsigned long end
)
108 printk ("Freeing initrd memory: %ldk freed\n", (end
- start
) >> 10);
109 for (; start
< end
; start
+= PAGE_SIZE
) {
110 ClearPageReserved(virt_to_page(start
));
111 init_page_count(virt_to_page(start
));
118 static struct kcore_list kcore_vmem
;
120 static int __init
setup_kcore(void)
124 for (i
=0; i
< lmb
.memory
.cnt
; i
++) {
125 unsigned long base
, size
;
126 struct kcore_list
*kcore_mem
;
128 base
= lmb
.memory
.region
[i
].base
;
129 size
= lmb
.memory
.region
[i
].size
;
131 /* GFP_ATOMIC to avoid might_sleep warnings during boot */
132 kcore_mem
= kmalloc(sizeof(struct kcore_list
), GFP_ATOMIC
);
134 panic("mem_init: kmalloc failed\n");
136 kclist_add(kcore_mem
, __va(base
), size
);
139 kclist_add(&kcore_vmem
, (void *)VMALLOC_START
, VMALLOC_END
-VMALLOC_START
);
143 module_init(setup_kcore
);
145 static void zero_ctor(void *addr
, kmem_cache_t
*cache
, unsigned long flags
)
147 memset(addr
, 0, kmem_cache_size(cache
));
150 #ifdef CONFIG_PPC_64K_PAGES
151 static const unsigned int pgtable_cache_size
[3] = {
152 PTE_TABLE_SIZE
, PMD_TABLE_SIZE
, PGD_TABLE_SIZE
154 static const char *pgtable_cache_name
[ARRAY_SIZE(pgtable_cache_size
)] = {
155 "pte_pmd_cache", "pmd_cache", "pgd_cache",
158 static const unsigned int pgtable_cache_size
[2] = {
159 PTE_TABLE_SIZE
, PMD_TABLE_SIZE
161 static const char *pgtable_cache_name
[ARRAY_SIZE(pgtable_cache_size
)] = {
162 "pgd_pte_cache", "pud_pmd_cache",
164 #endif /* CONFIG_PPC_64K_PAGES */
166 #ifdef CONFIG_HUGETLB_PAGE
167 /* Hugepages need one extra cache, initialized in hugetlbpage.c. We
168 * can't put into the tables above, because HPAGE_SHIFT is not compile
170 kmem_cache_t
*pgtable_cache
[ARRAY_SIZE(pgtable_cache_size
)+1];
172 kmem_cache_t
*pgtable_cache
[ARRAY_SIZE(pgtable_cache_size
)];
175 void pgtable_cache_init(void)
179 for (i
= 0; i
< ARRAY_SIZE(pgtable_cache_size
); i
++) {
180 int size
= pgtable_cache_size
[i
];
181 const char *name
= pgtable_cache_name
[i
];
183 DBG("Allocating page table cache %s (#%d) "
184 "for size: %08x...\n", name
, i
, size
);
185 pgtable_cache
[i
] = kmem_cache_create(name
,
188 SLAB_MUST_HWCACHE_ALIGN
,
191 if (! pgtable_cache
[i
])
192 panic("pgtable_cache_init(): could not create %s!\n",