blob: 81cfb0c2ec58bf5bd1d056b48206b551b1aad935 [file] [log] [blame]
Paul Mackerras14cf11a2005-09-26 16:04:21 +10001/*
2 * PowerPC version
3 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
4 *
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).
9 *
10 * Derived from "arch/i386/mm/init.c"
11 * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
12 *
13 * Dave Engebretsen <engebret@us.ibm.com>
14 * Rework for PPC64 port.
15 *
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.
20 *
21 */
22
Benjamin Herrenschmidt87655ff2005-11-10 14:53:16 +110023#undef DEBUG
24
Paul Mackerras14cf11a2005-09-26 16:04:21 +100025#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>
33#include <linux/mm.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
45#include <asm/pgalloc.h>
46#include <asm/page.h>
47#include <asm/prom.h>
48#include <asm/lmb.h>
49#include <asm/rtas.h>
50#include <asm/io.h>
51#include <asm/mmu_context.h>
52#include <asm/pgtable.h>
53#include <asm/mmu.h>
54#include <asm/uaccess.h>
55#include <asm/smp.h>
56#include <asm/machdep.h>
57#include <asm/tlb.h>
58#include <asm/eeh.h>
59#include <asm/processor.h>
60#include <asm/mmzone.h>
61#include <asm/cputable.h>
Paul Mackerras14cf11a2005-09-26 16:04:21 +100062#include <asm/sections.h>
63#include <asm/system.h>
64#include <asm/iommu.h>
65#include <asm/abs_addr.h>
66#include <asm/vdso.h>
David Gibson800fc3e2005-11-16 15:43:48 +110067
68#include "mmu_decl.h"
Paul Mackerras14cf11a2005-09-26 16:04:21 +100069
Benjamin Herrenschmidt87655ff2005-11-10 14:53:16 +110070#ifdef DEBUG
71#define DBG(fmt...) printk(fmt)
72#else
73#define DBG(fmt...)
74#endif
75
Paul Mackerras14cf11a2005-09-26 16:04:21 +100076#if PGTABLE_RANGE > USER_VSID_RANGE
77#warning Limited user VSID range means pagetable space is wasted
78#endif
79
80#if (TASK_SIZE_USER64 < PGTABLE_RANGE) && (TASK_SIZE_USER64 < USER_VSID_RANGE)
81#warning TASK_SIZE is smaller than it needs to be.
82#endif
83
Paul Mackerras14cf11a2005-09-26 16:04:21 +100084/* max amount of RAM to use */
85unsigned long __max_memory;
86
87/* info on what we think the IO hole is */
88unsigned long io_hole_start;
89unsigned long io_hole_size;
90
91/*
92 * Do very early mm setup.
93 */
94void __init mm_init_ppc64(void)
95{
96#ifndef CONFIG_PPC_ISERIES
97 unsigned long i;
98#endif
99
100 ppc64_boot_msg(0x100, "MM Init");
101
102 /* This is the story of the IO hole... please, keep seated,
103 * unfortunately, we are out of oxygen masks at the moment.
104 * So we need some rough way to tell where your big IO hole
105 * is. On pmac, it's between 2G and 4G, on POWER3, it's around
106 * that area as well, on POWER4 we don't have one, etc...
107 * We need that as a "hint" when sizing the TCE table on POWER3
108 * So far, the simplest way that seem work well enough for us it
109 * to just assume that the first discontinuity in our physical
110 * RAM layout is the IO hole. That may not be correct in the future
111 * (and isn't on iSeries but then we don't care ;)
112 */
113
114#ifndef CONFIG_PPC_ISERIES
115 for (i = 1; i < lmb.memory.cnt; i++) {
116 unsigned long base, prevbase, prevsize;
117
118 prevbase = lmb.memory.region[i-1].base;
119 prevsize = lmb.memory.region[i-1].size;
120 base = lmb.memory.region[i].base;
121 if (base > (prevbase + prevsize)) {
122 io_hole_start = prevbase + prevsize;
123 io_hole_size = base - (prevbase + prevsize);
124 break;
125 }
126 }
127#endif /* CONFIG_PPC_ISERIES */
128 if (io_hole_start)
129 printk("IO Hole assumed to be %lx -> %lx\n",
130 io_hole_start, io_hole_start + io_hole_size - 1);
131
132 ppc64_boot_msg(0x100, "MM Init Done");
133}
134
135void free_initmem(void)
136{
137 unsigned long addr;
138
139 addr = (unsigned long)__init_begin;
140 for (; addr < (unsigned long)__init_end; addr += PAGE_SIZE) {
141 memset((void *)addr, 0xcc, PAGE_SIZE);
142 ClearPageReserved(virt_to_page(addr));
143 set_page_count(virt_to_page(addr), 1);
144 free_page(addr);
145 totalram_pages++;
146 }
147 printk ("Freeing unused kernel memory: %luk freed\n",
148 ((unsigned long)__init_end - (unsigned long)__init_begin) >> 10);
149}
150
151#ifdef CONFIG_BLK_DEV_INITRD
152void free_initrd_mem(unsigned long start, unsigned long end)
153{
154 if (start < end)
155 printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
156 for (; start < end; start += PAGE_SIZE) {
157 ClearPageReserved(virt_to_page(start));
158 set_page_count(virt_to_page(start), 1);
159 free_page(start);
160 totalram_pages++;
161 }
162}
163#endif
164
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000165static struct kcore_list kcore_vmem;
166
167static int __init setup_kcore(void)
168{
169 int i;
170
171 for (i=0; i < lmb.memory.cnt; i++) {
172 unsigned long base, size;
173 struct kcore_list *kcore_mem;
174
175 base = lmb.memory.region[i].base;
176 size = lmb.memory.region[i].size;
177
178 /* GFP_ATOMIC to avoid might_sleep warnings during boot */
179 kcore_mem = kmalloc(sizeof(struct kcore_list), GFP_ATOMIC);
180 if (!kcore_mem)
181 panic("mem_init: kmalloc failed\n");
182
183 kclist_add(kcore_mem, __va(base), size);
184 }
185
186 kclist_add(&kcore_vmem, (void *)VMALLOC_START, VMALLOC_END-VMALLOC_START);
187
188 return 0;
189}
190module_init(setup_kcore);
191
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000192static void zero_ctor(void *addr, kmem_cache_t *cache, unsigned long flags)
193{
194 memset(addr, 0, kmem_cache_size(cache));
195}
196
Benjamin Herrenschmidt3c726f82005-11-07 11:06:55 +1100197#ifdef CONFIG_PPC_64K_PAGES
Benjamin Herrenschmidt87655ff2005-11-10 14:53:16 +1100198static const unsigned int pgtable_cache_size[3] = {
199 PTE_TABLE_SIZE, PMD_TABLE_SIZE, PGD_TABLE_SIZE
Benjamin Herrenschmidt3c726f82005-11-07 11:06:55 +1100200};
201static const char *pgtable_cache_name[ARRAY_SIZE(pgtable_cache_size)] = {
Benjamin Herrenschmidt87655ff2005-11-10 14:53:16 +1100202 "pte_pmd_cache", "pmd_cache", "pgd_cache",
Benjamin Herrenschmidt3c726f82005-11-07 11:06:55 +1100203};
204#else
Benjamin Herrenschmidt87655ff2005-11-10 14:53:16 +1100205static const unsigned int pgtable_cache_size[2] = {
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000206 PTE_TABLE_SIZE, PMD_TABLE_SIZE
207};
208static const char *pgtable_cache_name[ARRAY_SIZE(pgtable_cache_size)] = {
209 "pgd_pte_cache", "pud_pmd_cache",
210};
Benjamin Herrenschmidt3c726f82005-11-07 11:06:55 +1100211#endif /* CONFIG_PPC_64K_PAGES */
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000212
213kmem_cache_t *pgtable_cache[ARRAY_SIZE(pgtable_cache_size)];
214
215void pgtable_cache_init(void)
216{
217 int i;
218
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000219 for (i = 0; i < ARRAY_SIZE(pgtable_cache_size); i++) {
220 int size = pgtable_cache_size[i];
221 const char *name = pgtable_cache_name[i];
222
Benjamin Herrenschmidt87655ff2005-11-10 14:53:16 +1100223 DBG("Allocating page table cache %s (#%d) "
224 "for size: %08x...\n", name, i, size);
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000225 pgtable_cache[i] = kmem_cache_create(name,
226 size, size,
Benjamin Herrenschmidt3c726f82005-11-07 11:06:55 +1100227 SLAB_HWCACHE_ALIGN |
228 SLAB_MUST_HWCACHE_ALIGN,
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000229 zero_ctor,
230 NULL);
231 if (! pgtable_cache[i])
232 panic("pgtable_cache_init(): could not create %s!\n",
233 name);
234 }
235}