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>
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>
67 #include <asm/imalloc.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 unsigned long klimit = (unsigned long)_end;
85 /* max amount of RAM to use */
86 unsigned long __max_memory;
88 /* info on what we think the IO hole is */
89 unsigned long io_hole_start;
90 unsigned long io_hole_size;
93 * Do very early mm setup.
95 void __init mm_init_ppc64(void)
97 #ifndef CONFIG_PPC_ISERIES
101 ppc64_boot_msg(0x100, "MM Init");
103 /* This is the story of the IO hole... please, keep seated,
104 * unfortunately, we are out of oxygen masks at the moment.
105 * So we need some rough way to tell where your big IO hole
106 * is. On pmac, it's between 2G and 4G, on POWER3, it's around
107 * that area as well, on POWER4 we don't have one, etc...
108 * We need that as a "hint" when sizing the TCE table on POWER3
109 * So far, the simplest way that seem work well enough for us it
110 * to just assume that the first discontinuity in our physical
111 * RAM layout is the IO hole. That may not be correct in the future
112 * (and isn't on iSeries but then we don't care ;)
115 #ifndef CONFIG_PPC_ISERIES
116 for (i = 1; i < lmb.memory.cnt; i++) {
117 unsigned long base, prevbase, prevsize;
119 prevbase = lmb.memory.region[i-1].base;
120 prevsize = lmb.memory.region[i-1].size;
121 base = lmb.memory.region[i].base;
122 if (base > (prevbase + prevsize)) {
123 io_hole_start = prevbase + prevsize;
124 io_hole_size = base - (prevbase + prevsize);
128 #endif /* CONFIG_PPC_ISERIES */
130 printk("IO Hole assumed to be %lx -> %lx\n",
131 io_hole_start, io_hole_start + io_hole_size - 1);
133 ppc64_boot_msg(0x100, "MM Init Done");
136 void free_initmem(void)
140 addr = (unsigned long)__init_begin;
141 for (; addr < (unsigned long)__init_end; addr += PAGE_SIZE) {
142 memset((void *)addr, 0xcc, PAGE_SIZE);
143 ClearPageReserved(virt_to_page(addr));
144 set_page_count(virt_to_page(addr), 1);
148 printk ("Freeing unused kernel memory: %luk freed\n",
149 ((unsigned long)__init_end - (unsigned long)__init_begin) >> 10);
152 #ifdef CONFIG_BLK_DEV_INITRD
153 void free_initrd_mem(unsigned long start, unsigned long end)
156 printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
157 for (; start < end; start += PAGE_SIZE) {
158 ClearPageReserved(virt_to_page(start));
159 set_page_count(virt_to_page(start), 1);
166 static struct kcore_list kcore_vmem;
168 static int __init setup_kcore(void)
172 for (i=0; i < lmb.memory.cnt; i++) {
173 unsigned long base, size;
174 struct kcore_list *kcore_mem;
176 base = lmb.memory.region[i].base;
177 size = lmb.memory.region[i].size;
179 /* GFP_ATOMIC to avoid might_sleep warnings during boot */
180 kcore_mem = kmalloc(sizeof(struct kcore_list), GFP_ATOMIC);
182 panic("mem_init: kmalloc failed\n");
184 kclist_add(kcore_mem, __va(base), size);
187 kclist_add(&kcore_vmem, (void *)VMALLOC_START, VMALLOC_END-VMALLOC_START);
191 module_init(setup_kcore);
193 static void zero_ctor(void *addr, kmem_cache_t *cache, unsigned long flags)
195 memset(addr, 0, kmem_cache_size(cache));
198 #ifdef CONFIG_PPC_64K_PAGES
199 static const unsigned int pgtable_cache_size[3] = {
200 PTE_TABLE_SIZE, PMD_TABLE_SIZE, PGD_TABLE_SIZE
202 static const char *pgtable_cache_name[ARRAY_SIZE(pgtable_cache_size)] = {
203 "pte_pmd_cache", "pmd_cache", "pgd_cache",
206 static const unsigned int pgtable_cache_size[2] = {
207 PTE_TABLE_SIZE, PMD_TABLE_SIZE
209 static const char *pgtable_cache_name[ARRAY_SIZE(pgtable_cache_size)] = {
210 "pgd_pte_cache", "pud_pmd_cache",
212 #endif /* CONFIG_PPC_64K_PAGES */
214 kmem_cache_t *pgtable_cache[ARRAY_SIZE(pgtable_cache_size)];
216 void pgtable_cache_init(void)
220 for (i = 0; i < ARRAY_SIZE(pgtable_cache_size); i++) {
221 int size = pgtable_cache_size[i];
222 const char *name = pgtable_cache_name[i];
224 DBG("Allocating page table cache %s (#%d) "
225 "for size: %08x...\n", name, i, size);
226 pgtable_cache[i] = kmem_cache_create(name,
229 SLAB_MUST_HWCACHE_ALIGN,
232 if (! pgtable_cache[i])
233 panic("pgtable_cache_init(): could not create %s!\n",