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.
23 #include <linux/config.h>
24 #include <linux/signal.h>
25 #include <linux/sched.h>
26 #include <linux/kernel.h>
27 #include <linux/errno.h>
28 #include <linux/string.h>
29 #include <linux/types.h>
30 #include <linux/mman.h>
32 #include <linux/swap.h>
33 #include <linux/stddef.h>
34 #include <linux/vmalloc.h>
35 #include <linux/init.h>
36 #include <linux/delay.h>
37 #include <linux/bootmem.h>
38 #include <linux/highmem.h>
39 #include <linux/idr.h>
40 #include <linux/nodemask.h>
41 #include <linux/module.h>
43 #include <asm/pgalloc.h>
49 #include <asm/mmu_context.h>
50 #include <asm/pgtable.h>
52 #include <asm/uaccess.h>
54 #include <asm/machdep.h>
57 #include <asm/processor.h>
58 #include <asm/mmzone.h>
59 #include <asm/cputable.h>
60 #include <asm/ppcdebug.h>
61 #include <asm/sections.h>
62 #include <asm/system.h>
63 #include <asm/iommu.h>
64 #include <asm/abs_addr.h>
66 #include <asm/imalloc.h>
68 #if PGTABLE_RANGE > USER_VSID_RANGE
69 #warning Limited user VSID range means pagetable space is wasted
72 #if (TASK_SIZE_USER64 < PGTABLE_RANGE) && (TASK_SIZE_USER64 < USER_VSID_RANGE)
73 #warning TASK_SIZE is smaller than it needs to be.
77 unsigned long ioremap_bot = IMALLOC_BASE;
78 static unsigned long phbs_io_bot = PHBS_IO_BASE;
80 extern pgd_t swapper_pg_dir[];
81 extern struct task_struct *current_set[NR_CPUS];
83 unsigned long klimit = (unsigned long)_end;
85 unsigned long _SDR1=0;
88 /* max amount of RAM to use */
89 unsigned long __max_memory;
91 /* info on what we think the IO hole is */
92 unsigned long io_hole_start;
93 unsigned long io_hole_size;
96 * Do very early mm setup.
98 void __init mm_init_ppc64(void)
100 #ifndef CONFIG_PPC_ISERIES
104 ppc64_boot_msg(0x100, "MM Init");
106 /* This is the story of the IO hole... please, keep seated,
107 * unfortunately, we are out of oxygen masks at the moment.
108 * So we need some rough way to tell where your big IO hole
109 * is. On pmac, it's between 2G and 4G, on POWER3, it's around
110 * that area as well, on POWER4 we don't have one, etc...
111 * We need that as a "hint" when sizing the TCE table on POWER3
112 * So far, the simplest way that seem work well enough for us it
113 * to just assume that the first discontinuity in our physical
114 * RAM layout is the IO hole. That may not be correct in the future
115 * (and isn't on iSeries but then we don't care ;)
118 #ifndef CONFIG_PPC_ISERIES
119 for (i = 1; i < lmb.memory.cnt; i++) {
120 unsigned long base, prevbase, prevsize;
122 prevbase = lmb.memory.region[i-1].base;
123 prevsize = lmb.memory.region[i-1].size;
124 base = lmb.memory.region[i].base;
125 if (base > (prevbase + prevsize)) {
126 io_hole_start = prevbase + prevsize;
127 io_hole_size = base - (prevbase + prevsize);
131 #endif /* CONFIG_PPC_ISERIES */
133 printk("IO Hole assumed to be %lx -> %lx\n",
134 io_hole_start, io_hole_start + io_hole_size - 1);
136 ppc64_boot_msg(0x100, "MM Init Done");
139 void free_initmem(void)
143 addr = (unsigned long)__init_begin;
144 for (; addr < (unsigned long)__init_end; addr += PAGE_SIZE) {
145 memset((void *)addr, 0xcc, PAGE_SIZE);
146 ClearPageReserved(virt_to_page(addr));
147 set_page_count(virt_to_page(addr), 1);
151 printk ("Freeing unused kernel memory: %luk freed\n",
152 ((unsigned long)__init_end - (unsigned long)__init_begin) >> 10);
155 #ifdef CONFIG_BLK_DEV_INITRD
156 void free_initrd_mem(unsigned long start, unsigned long end)
159 printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
160 for (; start < end; start += PAGE_SIZE) {
161 ClearPageReserved(virt_to_page(start));
162 set_page_count(virt_to_page(start), 1);
169 static struct kcore_list kcore_vmem;
171 static int __init setup_kcore(void)
175 for (i=0; i < lmb.memory.cnt; i++) {
176 unsigned long base, size;
177 struct kcore_list *kcore_mem;
179 base = lmb.memory.region[i].base;
180 size = lmb.memory.region[i].size;
182 /* GFP_ATOMIC to avoid might_sleep warnings during boot */
183 kcore_mem = kmalloc(sizeof(struct kcore_list), GFP_ATOMIC);
185 panic("mem_init: kmalloc failed\n");
187 kclist_add(kcore_mem, __va(base), size);
190 kclist_add(&kcore_vmem, (void *)VMALLOC_START, VMALLOC_END-VMALLOC_START);
194 module_init(setup_kcore);
196 void __iomem * reserve_phb_iospace(unsigned long size)
198 void __iomem *virt_addr;
200 if (phbs_io_bot >= IMALLOC_BASE)
201 panic("reserve_phb_iospace(): phb io space overflow\n");
203 virt_addr = (void __iomem *) phbs_io_bot;
209 static void zero_ctor(void *addr, kmem_cache_t *cache, unsigned long flags)
211 memset(addr, 0, kmem_cache_size(cache));
214 static const int pgtable_cache_size[2] = {
215 PTE_TABLE_SIZE, PMD_TABLE_SIZE
217 static const char *pgtable_cache_name[ARRAY_SIZE(pgtable_cache_size)] = {
218 "pgd_pte_cache", "pud_pmd_cache",
221 kmem_cache_t *pgtable_cache[ARRAY_SIZE(pgtable_cache_size)];
223 void pgtable_cache_init(void)
227 BUILD_BUG_ON(PTE_TABLE_SIZE != pgtable_cache_size[PTE_CACHE_NUM]);
228 BUILD_BUG_ON(PMD_TABLE_SIZE != pgtable_cache_size[PMD_CACHE_NUM]);
229 BUILD_BUG_ON(PUD_TABLE_SIZE != pgtable_cache_size[PUD_CACHE_NUM]);
230 BUILD_BUG_ON(PGD_TABLE_SIZE != pgtable_cache_size[PGD_CACHE_NUM]);
232 for (i = 0; i < ARRAY_SIZE(pgtable_cache_size); i++) {
233 int size = pgtable_cache_size[i];
234 const char *name = pgtable_cache_name[i];
236 pgtable_cache[i] = kmem_cache_create(name,
239 | SLAB_MUST_HWCACHE_ALIGN,
242 if (! pgtable_cache[i])
243 panic("pgtable_cache_init(): could not create %s!\n",
248 pgprot_t phys_mem_access_prot(struct file *file, unsigned long addr,
249 unsigned long size, pgprot_t vma_prot)
251 if (ppc_md.phys_mem_access_prot)
252 return ppc_md.phys_mem_access_prot(file, addr, size, vma_prot);
254 if (!page_is_ram(addr >> PAGE_SHIFT))
255 vma_prot = __pgprot(pgprot_val(vma_prot)
256 | _PAGE_GUARDED | _PAGE_NO_CACHE);
259 EXPORT_SYMBOL(phys_mem_access_prot);