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>
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 /* info on what we think the IO hole is */
88 unsigned long io_hole_start;
89 unsigned long io_hole_size;
92 * Do very early mm setup.
94 void __init mm_init_ppc64(void)
96 #ifndef CONFIG_PPC_ISERIES
100 ppc64_boot_msg(0x100, "MM Init");
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 ;)
114 #ifndef CONFIG_PPC_ISERIES
115 for (i = 1; i < lmb.memory.cnt; i++) {
116 unsigned long base, prevbase, prevsize;
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);
127 #endif /* CONFIG_PPC_ISERIES */
129 printk("IO Hole assumed to be %lx -> %lx\n",
130 io_hole_start, io_hole_start + io_hole_size - 1);
132 ppc64_boot_msg(0x100, "MM Init Done");
135 void free_initmem(void)
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);
147 printk ("Freeing unused kernel memory: %luk freed\n",
148 ((unsigned long)__init_end - (unsigned long)__init_begin) >> 10);
151 #ifdef CONFIG_BLK_DEV_INITRD
152 void free_initrd_mem(unsigned long start, unsigned long 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);
165 static struct kcore_list kcore_vmem;
167 static int __init setup_kcore(void)
171 for (i=0; i < lmb.memory.cnt; i++) {
172 unsigned long base, size;
173 struct kcore_list *kcore_mem;
175 base = lmb.memory.region[i].base;
176 size = lmb.memory.region[i].size;
178 /* GFP_ATOMIC to avoid might_sleep warnings during boot */
179 kcore_mem = kmalloc(sizeof(struct kcore_list), GFP_ATOMIC);
181 panic("mem_init: kmalloc failed\n");
183 kclist_add(kcore_mem, __va(base), size);
186 kclist_add(&kcore_vmem, (void *)VMALLOC_START, VMALLOC_END-VMALLOC_START);
190 module_init(setup_kcore);
192 static void zero_ctor(void *addr, kmem_cache_t *cache, unsigned long flags)
194 memset(addr, 0, kmem_cache_size(cache));
197 #ifdef CONFIG_PPC_64K_PAGES
198 static const unsigned int pgtable_cache_size[3] = {
199 PTE_TABLE_SIZE, PMD_TABLE_SIZE, PGD_TABLE_SIZE
201 static const char *pgtable_cache_name[ARRAY_SIZE(pgtable_cache_size)] = {
202 "pte_pmd_cache", "pmd_cache", "pgd_cache",
205 static const unsigned int pgtable_cache_size[2] = {
206 PTE_TABLE_SIZE, PMD_TABLE_SIZE
208 static const char *pgtable_cache_name[ARRAY_SIZE(pgtable_cache_size)] = {
209 "pgd_pte_cache", "pud_pmd_cache",
211 #endif /* CONFIG_PPC_64K_PAGES */
213 kmem_cache_t *pgtable_cache[ARRAY_SIZE(pgtable_cache_size)];
215 void pgtable_cache_init(void)
219 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];
223 DBG("Allocating page table cache %s (#%d) "
224 "for size: %08x...\n", name, i, size);
225 pgtable_cache[i] = kmem_cache_create(name,
228 SLAB_MUST_HWCACHE_ALIGN,
231 if (! pgtable_cache[i])
232 panic("pgtable_cache_init(): could not create %s!\n",