2 * Copyright (C) 2007-2008 Michal Simek <monstr@monstr.eu>
3 * Copyright (C) 2006 Atmark Techno, Inc.
5 * This file is subject to the terms and conditions of the GNU General Public
6 * License. See the file "COPYING" in the main directory of this archive
10 #include <linux/bootmem.h>
11 #include <linux/init.h>
12 #include <linux/kernel.h>
13 #include <linux/memblock.h>
14 #include <linux/mm.h> /* mem_init */
15 #include <linux/initrd.h>
16 #include <linux/pagemap.h>
17 #include <linux/pfn.h>
18 #include <linux/slab.h>
19 #include <linux/swap.h>
20 #include <linux/export.h>
23 #include <asm/mmu_context.h>
24 #include <asm/pgalloc.h>
25 #include <asm/sections.h>
27 #include <asm/fixmap.h>
29 /* Use for MMU and noMMU because of PCI generic code */
33 unsigned int __page_offset
;
34 EXPORT_SYMBOL(__page_offset
);
37 static int init_bootmem_done
;
38 #endif /* CONFIG_MMU */
43 * Initialize the bootmem system and give it all the memory we
46 unsigned long memory_start
;
47 EXPORT_SYMBOL(memory_start
);
48 unsigned long memory_size
;
49 EXPORT_SYMBOL(memory_size
);
50 unsigned long lowmem_size
;
53 * paging_init() sets up the page tables - in fact we've already done this.
55 static void __init
paging_init(void)
57 unsigned long zones_size
[MAX_NR_ZONES
];
62 for (idx
= 0; idx
< __end_of_fixed_addresses
; idx
++)
66 /* Clean every zones */
67 memset(zones_size
, 0, sizeof(zones_size
));
69 zones_size
[ZONE_DMA
] = max_pfn
;
71 /* We don't have holes in memory map */
72 free_area_init_nodes(zones_size
);
75 void __init
setup_memory(void)
77 unsigned long map_size
;
78 struct memblock_region
*reg
;
81 u32 kernel_align_start
, kernel_align_size
;
83 /* Find main memory where is the kernel */
84 for_each_memblock(memory
, reg
) {
85 memory_start
= (u32
)reg
->base
;
86 lowmem_size
= reg
->size
;
87 if ((memory_start
<= (u32
)_text
) &&
88 ((u32
)_text
<= (memory_start
+ lowmem_size
- 1))) {
89 memory_size
= lowmem_size
;
90 PAGE_OFFSET
= memory_start
;
91 printk(KERN_INFO
"%s: Main mem: 0x%x, "
92 "size 0x%08x\n", __func__
, (u32
) memory_start
,
98 if (!memory_start
|| !memory_size
) {
99 panic("%s: Missing memory setting 0x%08x, size=0x%08x\n",
100 __func__
, (u32
) memory_start
, (u32
) memory_size
);
103 /* reservation of region where is the kernel */
104 kernel_align_start
= PAGE_DOWN((u32
)_text
);
105 /* ALIGN can be remove because _end in vmlinux.lds.S is align */
106 kernel_align_size
= PAGE_UP((u32
)klimit
) - kernel_align_start
;
107 printk(KERN_INFO
"%s: kernel addr:0x%08x-0x%08x size=0x%08x\n",
108 __func__
, kernel_align_start
, kernel_align_start
109 + kernel_align_size
, kernel_align_size
);
110 memblock_reserve(kernel_align_start
, kernel_align_size
);
114 * start: base phys address of kernel - page align
115 * end: base phys address of kernel - page align
117 * min_low_pfn - the first page (mm/bootmem.c - node_boot_start)
119 * max_mapnr - the first unused page (mm/bootmem.c - node_low_pfn)
120 * num_physpages - number of all pages
123 /* memory start is from the kernel end (aligned) to higher addr */
124 min_low_pfn
= memory_start
>> PAGE_SHIFT
; /* minimum for allocation */
125 /* RAM is assumed contiguous */
126 num_physpages
= max_mapnr
= memory_size
>> PAGE_SHIFT
;
127 max_low_pfn
= ((u64
)memory_start
+ (u64
)lowmem_size
) >> PAGE_SHIFT
;
128 max_pfn
= ((u64
)memory_start
+ (u64
)memory_size
) >> PAGE_SHIFT
;
130 printk(KERN_INFO
"%s: max_mapnr: %#lx\n", __func__
, max_mapnr
);
131 printk(KERN_INFO
"%s: min_low_pfn: %#lx\n", __func__
, min_low_pfn
);
132 printk(KERN_INFO
"%s: max_low_pfn: %#lx\n", __func__
, max_low_pfn
);
133 printk(KERN_INFO
"%s: max_pfn: %#lx\n", __func__
, max_pfn
);
136 * Find an area to use for the bootmem bitmap.
137 * We look for the first area which is at least
138 * 128kB in length (128kB is enough for a bitmap
139 * for 4GB of memory, using 4kB pages), plus 1 page
140 * (in case the address isn't page-aligned).
142 map_size
= init_bootmem_node(NODE_DATA(0),
143 PFN_UP(TOPHYS((u32
)klimit
)), min_low_pfn
, max_low_pfn
);
144 memblock_reserve(PFN_UP(TOPHYS((u32
)klimit
)) << PAGE_SHIFT
, map_size
);
146 /* Add active regions with valid PFNs */
147 for_each_memblock(memory
, reg
) {
148 unsigned long start_pfn
, end_pfn
;
150 start_pfn
= memblock_region_memory_base_pfn(reg
);
151 end_pfn
= memblock_region_memory_end_pfn(reg
);
152 memblock_set_node(start_pfn
<< PAGE_SHIFT
,
153 (end_pfn
- start_pfn
) << PAGE_SHIFT
, 0);
156 /* free bootmem is whole main memory */
157 free_bootmem_with_active_regions(0, max_low_pfn
);
159 /* reserve allocate blocks */
160 for_each_memblock(reserved
, reg
) {
161 unsigned long top
= reg
->base
+ reg
->size
- 1;
163 pr_debug("reserved - 0x%08x-0x%08x, %lx, %lx\n",
164 (u32
) reg
->base
, (u32
) reg
->size
, top
,
165 memory_start
+ lowmem_size
- 1);
167 if (top
<= (memory_start
+ lowmem_size
- 1)) {
168 reserve_bootmem(reg
->base
, reg
->size
, BOOTMEM_DEFAULT
);
169 } else if (reg
->base
< (memory_start
+ lowmem_size
- 1)) {
170 unsigned long trunc_size
= memory_start
+ lowmem_size
-
172 reserve_bootmem(reg
->base
, trunc_size
, BOOTMEM_DEFAULT
);
176 /* XXX need to clip this if using highmem? */
177 sparse_memory_present_with_active_regions(0);
180 init_bootmem_done
= 1;
185 void free_init_pages(char *what
, unsigned long begin
, unsigned long end
)
189 for (addr
= begin
; addr
< end
; addr
+= PAGE_SIZE
) {
190 ClearPageReserved(virt_to_page(addr
));
191 init_page_count(virt_to_page(addr
));
195 printk(KERN_INFO
"Freeing %s: %ldk freed\n", what
, (end
- begin
) >> 10);
198 #ifdef CONFIG_BLK_DEV_INITRD
199 void free_initrd_mem(unsigned long start
, unsigned long end
)
202 for (; start
< end
; start
+= PAGE_SIZE
) {
203 ClearPageReserved(virt_to_page(start
));
204 init_page_count(virt_to_page(start
));
209 printk(KERN_NOTICE
"Freeing initrd memory: %dk freed\n",
210 (int)(pages
* (PAGE_SIZE
/ 1024)));
214 void free_initmem(void)
216 free_init_pages("unused kernel memory",
217 (unsigned long)(&__init_begin
),
218 (unsigned long)(&__init_end
));
221 void __init
mem_init(void)
224 unsigned long reservedpages
= 0, codesize
, initsize
, datasize
, bsssize
;
226 high_memory
= (void *)__va(memory_start
+ lowmem_size
- 1);
228 /* this will put all memory onto the freelists */
229 totalram_pages
+= free_all_bootmem();
231 for_each_online_pgdat(pgdat
) {
235 for (i
= 0; i
< pgdat
->node_spanned_pages
; i
++) {
236 if (!pfn_valid(pgdat
->node_start_pfn
+ i
))
238 page
= pgdat_page_nr(pgdat
, i
);
239 if (PageReserved(page
))
244 codesize
= (unsigned long)&_sdata
- (unsigned long)&_stext
;
245 datasize
= (unsigned long)&_edata
- (unsigned long)&_sdata
;
246 initsize
= (unsigned long)&__init_end
- (unsigned long)&__init_begin
;
247 bsssize
= (unsigned long)&__bss_stop
- (unsigned long)&__bss_start
;
249 pr_info("Memory: %luk/%luk available (%luk kernel code, "
250 "%luk reserved, %luk data, %luk bss, %luk init)\n",
251 nr_free_pages() << (PAGE_SHIFT
-10),
252 num_physpages
<< (PAGE_SHIFT
-10),
254 reservedpages
<< (PAGE_SHIFT
-10),
260 pr_info("Kernel virtual memory layout:\n");
261 pr_info(" * 0x%08lx..0x%08lx : fixmap\n", FIXADDR_START
, FIXADDR_TOP
);
262 pr_info(" * 0x%08lx..0x%08lx : early ioremap\n",
263 ioremap_bot
, ioremap_base
);
264 pr_info(" * 0x%08lx..0x%08lx : vmalloc & ioremap\n",
265 (unsigned long)VMALLOC_START
, VMALLOC_END
);
271 int page_is_ram(unsigned long pfn
)
273 return __range_ok(pfn
, 0);
276 int page_is_ram(unsigned long pfn
)
278 return pfn
< max_low_pfn
;
282 * Check for command-line options that affect what MMU_init will do.
284 static void mm_cmdline_setup(void)
286 unsigned long maxmem
= 0;
289 /* Look for mem= option on command line */
290 p
= strstr(cmd_line
, "mem=");
293 maxmem
= memparse(p
, &p
);
294 if (maxmem
&& memory_size
> maxmem
) {
295 memory_size
= maxmem
;
296 memblock
.memory
.regions
[0].size
= memory_size
;
302 * MMU_init_hw does the chip-specific initialization of the MMU hardware.
304 static void __init
mmu_init_hw(void)
307 * The Zone Protection Register (ZPR) defines how protection will
308 * be applied to every page which is a member of a given zone. At
309 * present, we utilize only two of the zones.
310 * The zone index bits (of ZSEL) in the PTE are used for software
311 * indicators, except the LSB. For user access, zone 1 is used,
312 * for kernel access, zone 0 is used. We set all but zone 1
313 * to zero, allowing only kernel access as indicated in the PTE.
314 * For zone 1, we set a 01 binary (a value of 10 will not work)
315 * to allow user access as indicated in the PTE. This also allows
316 * kernel access as indicated in the PTE.
318 __asm__
__volatile__ ("ori r11, r0, 0x10000000;" \
324 * MMU_init sets up the basic memory mappings for the kernel,
325 * including both RAM and possibly some I/O regions,
326 * and sets up the page tables and the MMU hardware ready to go.
329 /* called from head.S */
330 asmlinkage
void __init
mmu_init(void)
332 unsigned int kstart
, ksize
;
334 if (!memblock
.reserved
.cnt
) {
335 printk(KERN_EMERG
"Error memory count\n");
336 machine_restart(NULL
);
339 if ((u32
) memblock
.memory
.regions
[0].size
< 0x1000000) {
340 printk(KERN_EMERG
"Memory must be greater than 16MB\n");
341 machine_restart(NULL
);
343 /* Find main memory where the kernel is */
344 memory_start
= (u32
) memblock
.memory
.regions
[0].base
;
345 lowmem_size
= memory_size
= (u32
) memblock
.memory
.regions
[0].size
;
347 if (lowmem_size
> CONFIG_LOWMEM_SIZE
) {
348 lowmem_size
= CONFIG_LOWMEM_SIZE
;
349 memory_size
= lowmem_size
;
352 mm_cmdline_setup(); /* FIXME parse args from command line - not used */
355 * Map out the kernel text/data/bss from the available physical
358 kstart
= __pa(CONFIG_KERNEL_START
); /* kernel start */
360 ksize
= PAGE_ALIGN(((u32
)_end
- (u32
)CONFIG_KERNEL_START
));
361 memblock_reserve(kstart
, ksize
);
363 #if defined(CONFIG_BLK_DEV_INITRD)
364 /* Remove the init RAM disk from the available memory. */
365 /* if (initrd_start) {
366 mem_pieces_remove(&phys_avail, __pa(initrd_start),
367 initrd_end - initrd_start, 1);
369 #endif /* CONFIG_BLK_DEV_INITRD */
371 /* Initialize the MMU hardware */
374 /* Map in all of RAM starting at CONFIG_KERNEL_START */
377 /* Extend vmalloc and ioremap area as big as possible */
378 ioremap_base
= ioremap_bot
= FIXADDR_START
;
380 /* Initialize the context management stuff */
383 /* Shortly after that, the entire linear mapping will be available */
384 /* This will also cause that unflatten device tree will be allocated
385 * inside 768MB limit */
386 memblock_set_current_limit(memory_start
+ lowmem_size
- 1);
389 /* This is only called until mem_init is done. */
390 void __init
*early_get_page(void)
393 if (init_bootmem_done
) {
394 p
= alloc_bootmem_pages(PAGE_SIZE
);
397 * Mem start + 32MB -> here is limit
398 * because of mem mapping from head.S
400 p
= __va(memblock_alloc_base(PAGE_SIZE
, PAGE_SIZE
,
401 memory_start
+ 0x2000000));
406 #endif /* CONFIG_MMU */
408 void * __init_refok
alloc_maybe_bootmem(size_t size
, gfp_t mask
)
411 return kmalloc(size
, mask
);
413 return alloc_bootmem(size
);
416 void * __init_refok
zalloc_maybe_bootmem(size_t size
, gfp_t mask
)
421 p
= kzalloc(size
, mask
);
423 p
= alloc_bootmem(size
);
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