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 * PPC44x/36-bit changes by Matt Porter (mporter@mvista.com)
10 * Derived from "arch/i386/mm/init.c"
11 * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
13 * This program is free software; you can redistribute it and/or
14 * modify it under the terms of the GNU General Public License
15 * as published by the Free Software Foundation; either version
16 * 2 of the License, or (at your option) any later version.
20 #include <linux/module.h>
21 #include <linux/sched.h>
22 #include <linux/kernel.h>
23 #include <linux/errno.h>
24 #include <linux/string.h>
25 #include <linux/types.h>
27 #include <linux/stddef.h>
28 #include <linux/init.h>
29 #include <linux/bootmem.h>
30 #include <linux/highmem.h>
31 #include <linux/initrd.h>
32 #include <linux/pagemap.h>
34 #include <asm/pgalloc.h>
37 #include <asm/mmu_context.h>
38 #include <asm/pgtable.h>
41 #include <asm/machdep.h>
42 #include <asm/btext.h>
45 #include <asm/sections.h>
49 #if defined(CONFIG_KERNEL_START_BOOL) || defined(CONFIG_LOWMEM_SIZE_BOOL)
50 /* The ammount of lowmem must be within 0xF0000000 - KERNELBASE. */
51 #if (CONFIG_LOWMEM_SIZE > (0xF0000000 - KERNELBASE))
52 #error "You must adjust CONFIG_LOWMEM_SIZE or CONFIG_START_KERNEL"
55 #define MAX_LOW_MEM CONFIG_LOWMEM_SIZE
57 DEFINE_PER_CPU(struct mmu_gather
, mmu_gathers
);
59 unsigned long total_memory
;
60 unsigned long total_lowmem
;
62 unsigned long ppc_memstart
;
63 unsigned long ppc_memoffset
= PAGE_OFFSET
;
66 #ifdef CONFIG_PPC_PMAC
67 unsigned long agp_special_page
;
68 EXPORT_SYMBOL(agp_special_page
);
75 EXPORT_SYMBOL(kmap_prot
);
76 EXPORT_SYMBOL(kmap_pte
);
81 /* XXX should be in current.h -- paulus */
82 extern struct task_struct
*current_set
[NR_CPUS
];
84 extern int init_bootmem_done
;
87 * this tells the system to map all of ram with the segregs
88 * (i.e. page tables) instead of the bats.
91 int __map_without_bats
;
92 int __map_without_ltlbs
;
94 /* max amount of low RAM to map in */
95 unsigned long __max_low_memory
= MAX_LOW_MEM
;
98 * limit of what is accessible with initial MMU setup -
99 * 256MB usually, but only 16MB on 601.
101 unsigned long __initial_memory_limit
= 0x10000000;
104 * Check for command-line options that affect what MMU_init will do.
108 /* Check for nobats option (used in mapin_ram). */
109 if (strstr(cmd_line
, "nobats")) {
110 __map_without_bats
= 1;
113 if (strstr(cmd_line
, "noltlbs")) {
114 __map_without_ltlbs
= 1;
116 #ifdef CONFIG_DEBUG_PAGEALLOC
117 __map_without_bats
= 1;
118 __map_without_ltlbs
= 1;
123 * MMU_init sets up the basic memory mappings for the kernel,
124 * including both RAM and possibly some I/O regions,
125 * and sets up the page tables and the MMU hardware ready to go.
127 void __init
MMU_init(void)
130 ppc_md
.progress("MMU:enter", 0x111);
132 /* 601 can only access 16MB at the moment */
133 if (PVR_VER(mfspr(SPRN_PVR
)) == 1)
134 __initial_memory_limit
= 0x01000000;
136 /* parse args from command line */
139 if (lmb
.memory
.cnt
> 1) {
142 printk(KERN_WARNING
"Only using first contiguous memory region");
145 total_memory
= lmb_end_of_DRAM();
146 total_lowmem
= total_memory
;
148 #ifdef CONFIG_FSL_BOOKE
149 /* Freescale Book-E parts expect lowmem to be mapped by fixed TLB
150 * entries, so we need to adjust lowmem to match the amount we can map
151 * in the fixed entries */
152 adjust_total_lowmem();
153 #endif /* CONFIG_FSL_BOOKE */
155 if (total_lowmem
> __max_low_memory
) {
156 total_lowmem
= __max_low_memory
;
157 #ifndef CONFIG_HIGHMEM
158 total_memory
= total_lowmem
;
159 lmb_enforce_memory_limit(total_lowmem
);
161 #endif /* CONFIG_HIGHMEM */
164 /* Initialize the MMU hardware */
166 ppc_md
.progress("MMU:hw init", 0x300);
169 /* Map in all of RAM starting at KERNELBASE */
171 ppc_md
.progress("MMU:mapin", 0x301);
174 #ifdef CONFIG_HIGHMEM
175 ioremap_base
= PKMAP_BASE
;
177 ioremap_base
= 0xfe000000UL
; /* for now, could be 0xfffff000 */
178 #endif /* CONFIG_HIGHMEM */
179 ioremap_bot
= ioremap_base
;
181 /* Map in I/O resources */
183 ppc_md
.progress("MMU:setio", 0x302);
184 if (ppc_md
.setup_io_mappings
)
185 ppc_md
.setup_io_mappings();
187 /* Initialize the context management stuff */
191 ppc_md
.progress("MMU:exit", 0x211);
193 /* From now on, btext is no longer BAT mapped if it was at all */
194 #ifdef CONFIG_BOOTX_TEXT
199 /* This is only called until mem_init is done. */
200 void __init
*early_get_page(void)
204 if (init_bootmem_done
) {
205 p
= alloc_bootmem_pages(PAGE_SIZE
);
207 p
= __va(lmb_alloc_base(PAGE_SIZE
, PAGE_SIZE
,
208 __initial_memory_limit
));
213 /* Free up now-unused memory */
214 static void free_sec(unsigned long start
, unsigned long end
, const char *name
)
216 unsigned long cnt
= 0;
218 while (start
< end
) {
219 ClearPageReserved(virt_to_page(start
));
220 init_page_count(virt_to_page(start
));
226 printk(" %ldk %s", cnt
<< (PAGE_SHIFT
- 10), name
);
227 totalram_pages
+= cnt
;
231 void free_initmem(void)
233 #define FREESEC(TYPE) \
234 free_sec((unsigned long)(&__ ## TYPE ## _begin), \
235 (unsigned long)(&__ ## TYPE ## _end), \
238 printk ("Freeing unused kernel memory:");
241 ppc_md
.progress
= NULL
;
245 #ifdef CONFIG_BLK_DEV_INITRD
246 void free_initrd_mem(unsigned long start
, unsigned long end
)
249 printk ("Freeing initrd memory: %ldk freed\n", (end
- start
) >> 10);
250 for (; start
< end
; start
+= PAGE_SIZE
) {
251 ClearPageReserved(virt_to_page(start
));
252 init_page_count(virt_to_page(start
));
259 #ifdef CONFIG_PROC_KCORE
260 static struct kcore_list kcore_vmem
;
262 static int __init
setup_kcore(void)
266 for (i
= 0; i
< lmb
.memory
.cnt
; i
++) {
269 struct kcore_list
*kcore_mem
;
271 base
= lmb
.memory
.region
[i
].base
;
272 size
= lmb
.memory
.region
[i
].size
;
274 kcore_mem
= kmalloc(sizeof(struct kcore_list
), GFP_ATOMIC
);
276 panic("%s: kmalloc failed\n", __FUNCTION__
);
278 /* must stay under 32 bits */
279 if ( 0xfffffffful
- (unsigned long)__va(base
) < size
) {
280 size
= 0xfffffffful
- (unsigned long)(__va(base
));
281 printk(KERN_DEBUG
"setup_kcore: restrict size=%lx\n",
285 kclist_add(kcore_mem
, __va(base
), size
);
288 kclist_add(&kcore_vmem
, (void *)VMALLOC_START
,
289 VMALLOC_END
-VMALLOC_START
);
293 module_init(setup_kcore
);
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