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git.ipfire.org Git - people/arne_f/kernel.git/blob - arch/microblaze/mm/init.c
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/lmb.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>
22 #include <asm/mmu_context.h>
23 #include <asm/pgalloc.h>
24 #include <asm/sections.h>
27 /* Use for MMU and noMMU because of PCI generic code */
31 unsigned int __page_offset
;
32 EXPORT_SYMBOL(__page_offset
);
35 DEFINE_PER_CPU(struct mmu_gather
, mmu_gathers
);
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_end
; /* due to mm/nommu.c */
49 unsigned long memory_size
;
52 * paging_init() sets up the page tables - in fact we've already done this.
54 static void __init
paging_init(void)
56 unsigned long zones_size
[MAX_NR_ZONES
];
58 /* Clean every zones */
59 memset(zones_size
, 0, sizeof(zones_size
));
62 * old: we can DMA to/from any address.put all page into ZONE_DMA
63 * We use only ZONE_NORMAL
65 zones_size
[ZONE_NORMAL
] = max_mapnr
;
67 free_area_init(zones_size
);
70 void __init
setup_memory(void)
73 unsigned long map_size
;
75 u32 kernel_align_start
, kernel_align_size
;
77 /* Find main memory where is the kernel */
78 for (i
= 0; i
< lmb
.memory
.cnt
; i
++) {
79 memory_start
= (u32
) lmb
.memory
.region
[i
].base
;
80 memory_end
= (u32
) lmb
.memory
.region
[i
].base
81 + (u32
) lmb
.memory
.region
[i
].size
;
82 if ((memory_start
<= (u32
)_text
) &&
83 ((u32
)_text
<= memory_end
)) {
84 memory_size
= memory_end
- memory_start
;
85 PAGE_OFFSET
= memory_start
;
86 printk(KERN_INFO
"%s: Main mem: 0x%x-0x%x, "
87 "size 0x%08x\n", __func__
, (u32
) memory_start
,
88 (u32
) memory_end
, (u32
) memory_size
);
93 if (!memory_start
|| !memory_end
) {
94 panic("%s: Missing memory setting 0x%08x-0x%08x\n",
95 __func__
, (u32
) memory_start
, (u32
) memory_end
);
98 /* reservation of region where is the kernel */
99 kernel_align_start
= PAGE_DOWN((u32
)_text
);
100 /* ALIGN can be remove because _end in vmlinux.lds.S is align */
101 kernel_align_size
= PAGE_UP((u32
)klimit
) - kernel_align_start
;
102 lmb_reserve(kernel_align_start
, kernel_align_size
);
103 printk(KERN_INFO
"%s: kernel addr=0x%08x-0x%08x size=0x%08x\n",
104 __func__
, kernel_align_start
, kernel_align_start
105 + kernel_align_size
, kernel_align_size
);
110 * start: base phys address of kernel - page align
111 * end: base phys address of kernel - page align
113 * min_low_pfn - the first page (mm/bootmem.c - node_boot_start)
115 * max_mapnr - the first unused page (mm/bootmem.c - node_low_pfn)
116 * num_physpages - number of all pages
119 /* memory start is from the kernel end (aligned) to higher addr */
120 min_low_pfn
= memory_start
>> PAGE_SHIFT
; /* minimum for allocation */
121 /* RAM is assumed contiguous */
122 num_physpages
= max_mapnr
= memory_size
>> PAGE_SHIFT
;
123 max_pfn
= max_low_pfn
= memory_end
>> PAGE_SHIFT
;
125 printk(KERN_INFO
"%s: max_mapnr: %#lx\n", __func__
, max_mapnr
);
126 printk(KERN_INFO
"%s: min_low_pfn: %#lx\n", __func__
, min_low_pfn
);
127 printk(KERN_INFO
"%s: max_low_pfn: %#lx\n", __func__
, max_low_pfn
);
130 * Find an area to use for the bootmem bitmap.
131 * We look for the first area which is at least
132 * 128kB in length (128kB is enough for a bitmap
133 * for 4GB of memory, using 4kB pages), plus 1 page
134 * (in case the address isn't page-aligned).
137 map_size
= init_bootmem_node(NODE_DATA(0), PFN_UP(TOPHYS((u32
)klimit
)),
138 min_low_pfn
, max_low_pfn
);
140 map_size
= init_bootmem_node(&contig_page_data
,
141 PFN_UP(TOPHYS((u32
)klimit
)), min_low_pfn
, max_low_pfn
);
143 lmb_reserve(PFN_UP(TOPHYS((u32
)klimit
)) << PAGE_SHIFT
, map_size
);
145 /* free bootmem is whole main memory */
146 free_bootmem(memory_start
, memory_size
);
148 /* reserve allocate blocks */
149 for (i
= 0; i
< lmb
.reserved
.cnt
; i
++) {
150 pr_debug("reserved %d - 0x%08x-0x%08x\n", i
,
151 (u32
) lmb
.reserved
.region
[i
].base
,
152 (u32
) lmb_size_bytes(&lmb
.reserved
, i
));
153 reserve_bootmem(lmb
.reserved
.region
[i
].base
,
154 lmb_size_bytes(&lmb
.reserved
, i
) - 1, BOOTMEM_DEFAULT
);
157 init_bootmem_done
= 1;
162 void free_init_pages(char *what
, unsigned long begin
, unsigned long end
)
166 for (addr
= begin
; addr
< end
; addr
+= PAGE_SIZE
) {
167 ClearPageReserved(virt_to_page(addr
));
168 init_page_count(virt_to_page(addr
));
169 memset((void *)addr
, 0xcc, PAGE_SIZE
);
173 printk(KERN_INFO
"Freeing %s: %ldk freed\n", what
, (end
- begin
) >> 10);
176 #ifdef CONFIG_BLK_DEV_INITRD
177 void free_initrd_mem(unsigned long start
, unsigned long end
)
180 for (; start
< end
; start
+= PAGE_SIZE
) {
181 ClearPageReserved(virt_to_page(start
));
182 init_page_count(virt_to_page(start
));
187 printk(KERN_NOTICE
"Freeing initrd memory: %dk freed\n",
188 (int)(pages
* (PAGE_SIZE
/ 1024)));
192 void free_initmem(void)
194 free_init_pages("unused kernel memory",
195 (unsigned long)(&__init_begin
),
196 (unsigned long)(&__init_end
));
199 void __init
mem_init(void)
201 high_memory
= (void *)__va(memory_end
);
202 /* this will put all memory onto the freelists */
203 totalram_pages
+= free_all_bootmem();
205 printk(KERN_INFO
"Memory: %luk/%luk available\n",
206 nr_free_pages() << (PAGE_SHIFT
-10),
207 num_physpages
<< (PAGE_SHIFT
-10));
212 /* Check against bounds of physical memory */
213 int ___range_ok(unsigned long addr
, unsigned long size
)
215 return ((addr
< memory_start
) ||
216 ((addr
+ size
) > memory_end
));
218 EXPORT_SYMBOL(___range_ok
);
220 int page_is_ram(unsigned long pfn
)
222 return __range_ok(pfn
, 0);
225 int page_is_ram(unsigned long pfn
)
227 return pfn
< max_low_pfn
;
231 * Check for command-line options that affect what MMU_init will do.
233 static void mm_cmdline_setup(void)
235 unsigned long maxmem
= 0;
238 /* Look for mem= option on command line */
239 p
= strstr(cmd_line
, "mem=");
242 maxmem
= memparse(p
, &p
);
243 if (maxmem
&& memory_size
> maxmem
) {
244 memory_size
= maxmem
;
245 memory_end
= memory_start
+ memory_size
;
246 lmb
.memory
.region
[0].size
= memory_size
;
252 * MMU_init_hw does the chip-specific initialization of the MMU hardware.
254 static void __init
mmu_init_hw(void)
257 * The Zone Protection Register (ZPR) defines how protection will
258 * be applied to every page which is a member of a given zone. At
259 * present, we utilize only two of the zones.
260 * The zone index bits (of ZSEL) in the PTE are used for software
261 * indicators, except the LSB. For user access, zone 1 is used,
262 * for kernel access, zone 0 is used. We set all but zone 1
263 * to zero, allowing only kernel access as indicated in the PTE.
264 * For zone 1, we set a 01 binary (a value of 10 will not work)
265 * to allow user access as indicated in the PTE. This also allows
266 * kernel access as indicated in the PTE.
268 __asm__
__volatile__ ("ori r11, r0, 0x10000000;" \
274 * MMU_init sets up the basic memory mappings for the kernel,
275 * including both RAM and possibly some I/O regions,
276 * and sets up the page tables and the MMU hardware ready to go.
279 /* called from head.S */
280 asmlinkage
void __init
mmu_init(void)
282 unsigned int kstart
, ksize
;
284 if (!lmb
.reserved
.cnt
) {
285 printk(KERN_EMERG
"Error memory count\n");
286 machine_restart(NULL
);
289 if ((u32
) lmb
.memory
.region
[0].size
< 0x1000000) {
290 printk(KERN_EMERG
"Memory must be greater than 16MB\n");
291 machine_restart(NULL
);
293 /* Find main memory where the kernel is */
294 memory_start
= (u32
) lmb
.memory
.region
[0].base
;
295 memory_end
= (u32
) lmb
.memory
.region
[0].base
+
296 (u32
) lmb
.memory
.region
[0].size
;
297 memory_size
= memory_end
- memory_start
;
299 mm_cmdline_setup(); /* FIXME parse args from command line - not used */
302 * Map out the kernel text/data/bss from the available physical
305 kstart
= __pa(CONFIG_KERNEL_START
); /* kernel start */
307 ksize
= PAGE_ALIGN(((u32
)_end
- (u32
)CONFIG_KERNEL_START
));
308 lmb_reserve(kstart
, ksize
);
310 #if defined(CONFIG_BLK_DEV_INITRD)
311 /* Remove the init RAM disk from the available memory. */
312 /* if (initrd_start) {
313 mem_pieces_remove(&phys_avail, __pa(initrd_start),
314 initrd_end - initrd_start, 1);
316 #endif /* CONFIG_BLK_DEV_INITRD */
318 /* Initialize the MMU hardware */
321 /* Map in all of RAM starting at CONFIG_KERNEL_START */
324 #ifdef HIGHMEM_START_BOOL
325 ioremap_base
= HIGHMEM_START
;
327 ioremap_base
= 0xfe000000UL
; /* for now, could be 0xfffff000 */
328 #endif /* CONFIG_HIGHMEM */
329 ioremap_bot
= ioremap_base
;
331 /* Initialize the context management stuff */
335 /* This is only called until mem_init is done. */
336 void __init
*early_get_page(void)
339 if (init_bootmem_done
) {
340 p
= alloc_bootmem_pages(PAGE_SIZE
);
343 * Mem start + 32MB -> here is limit
344 * because of mem mapping from head.S
346 p
= __va(lmb_alloc_base(PAGE_SIZE
, PAGE_SIZE
,
347 memory_start
+ 0x2000000));
352 #endif /* CONFIG_MMU */
354 void * __init_refok
alloc_maybe_bootmem(size_t size
, gfp_t mask
)
357 return kmalloc(size
, mask
);
359 return alloc_bootmem(size
);
362 void * __init_refok
zalloc_maybe_bootmem(size_t size
, gfp_t mask
)
367 p
= kzalloc(size
, mask
);
369 p
= alloc_bootmem(size
);