1/*
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
23#undef DEBUG
24
25#include <linux/signal.h>
26#include <linux/sched.h>
27#include <linux/kernel.h>
28#include <linux/errno.h>
29#include <linux/string.h>
30#include <linux/types.h>
31#include <linux/mman.h>
32#include <linux/mm.h>
33#include <linux/swap.h>
34#include <linux/stddef.h>
35#include <linux/vmalloc.h>
36#include <linux/init.h>
37#include <linux/delay.h>
38#include <linux/bootmem.h>
39#include <linux/highmem.h>
40#include <linux/idr.h>
41#include <linux/nodemask.h>
42#include <linux/module.h>
43#include <linux/poison.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>
62#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>
67
68#include "mmu_decl.h"
69
70#ifdef DEBUG
71#define DBG(fmt...) printk(fmt)
72#else
73#define DBG(fmt...)
74#endif
75
76#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
84/* max amount of RAM to use */
85unsigned long __max_memory;
86
87void free_initmem(void)
88{
89	unsigned long addr;
90
91	addr = (unsigned long)__init_begin;
92	for (; addr < (unsigned long)__init_end; addr += PAGE_SIZE) {
93		memset((void *)addr, POISON_FREE_INITMEM, PAGE_SIZE);
94		ClearPageReserved(virt_to_page(addr));
95		init_page_count(virt_to_page(addr));
96		free_page(addr);
97		totalram_pages++;
98	}
99	printk ("Freeing unused kernel memory: %luk freed\n",
100		((unsigned long)__init_end - (unsigned long)__init_begin) >> 10);
101}
102
103#ifdef CONFIG_BLK_DEV_INITRD
104void free_initrd_mem(unsigned long start, unsigned long end)
105{
106	if (start < end)
107		printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
108	for (; start < end; start += PAGE_SIZE) {
109		ClearPageReserved(virt_to_page(start));
110		init_page_count(virt_to_page(start));
111		free_page(start);
112		totalram_pages++;
113	}
114}
115#endif
116
117static struct kcore_list kcore_vmem;
118
119static int __init setup_kcore(void)
120{
121	int i;
122
123	for (i=0; i < lmb.memory.cnt; i++) {
124		unsigned long base, size;
125		struct kcore_list *kcore_mem;
126
127		base = lmb.memory.region[i].base;
128		size = lmb.memory.region[i].size;
129
130		/* GFP_ATOMIC to avoid might_sleep warnings during boot */
131		kcore_mem = kmalloc(sizeof(struct kcore_list), GFP_ATOMIC);
132		if (!kcore_mem)
133			panic("%s: kmalloc failed\n", __FUNCTION__);
134
135		kclist_add(kcore_mem, __va(base), size);
136	}
137
138	kclist_add(&kcore_vmem, (void *)VMALLOC_START, VMALLOC_END-VMALLOC_START);
139
140	return 0;
141}
142module_init(setup_kcore);
143
144static void zero_ctor(void *addr, struct kmem_cache *cache, unsigned long flags)
145{
146	memset(addr, 0, kmem_cache_size(cache));
147}
148
149static const unsigned int pgtable_cache_size[2] = {
150	PGD_TABLE_SIZE, PMD_TABLE_SIZE
151};
152static const char *pgtable_cache_name[ARRAY_SIZE(pgtable_cache_size)] = {
153#ifdef CONFIG_PPC_64K_PAGES
154	"pgd_cache", "pmd_cache",
155#else
156	"pgd_cache", "pud_pmd_cache",
157#endif /* CONFIG_PPC_64K_PAGES */
158};
159
160#ifdef CONFIG_HUGETLB_PAGE
161/* Hugepages need one extra cache, initialized in hugetlbpage.c.  We
162 * can't put into the tables above, because HPAGE_SHIFT is not compile
163 * time constant. */
164struct kmem_cache *pgtable_cache[ARRAY_SIZE(pgtable_cache_size)+1];
165#else
166struct kmem_cache *pgtable_cache[ARRAY_SIZE(pgtable_cache_size)];
167#endif
168
169void pgtable_cache_init(void)
170{
171	int i;
172
173	for (i = 0; i < ARRAY_SIZE(pgtable_cache_size); i++) {
174		int size = pgtable_cache_size[i];
175		const char *name = pgtable_cache_name[i];
176
177		DBG("Allocating page table cache %s (#%d) "
178		    "for size: %08x...\n", name, i, size);
179		pgtable_cache[i] = kmem_cache_create(name,
180						     size, size,
181						     SLAB_PANIC,
182						     zero_ctor,
183						     NULL);
184	}
185}
186