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/swap.h>
21 #include <asm/mmu_context.h>
22 #include <asm/pgalloc.h>
23 #include <asm/sections.h>
27 unsigned int __page_offset
;
28 EXPORT_SYMBOL(__page_offset
);
31 DEFINE_PER_CPU(struct mmu_gather
, mmu_gathers
);
34 static int init_bootmem_done
;
35 #endif /* CONFIG_MMU */
40 * Initialize the bootmem system and give it all the memory we
43 unsigned long memory_start
;
44 unsigned long memory_end
; /* due to mm/nommu.c */
45 unsigned long memory_size
;
48 * paging_init() sets up the page tables - in fact we've already done this.
50 static void __init
paging_init(void)
52 unsigned long zones_size
[MAX_NR_ZONES
];
54 /* Clean every zones */
55 memset(zones_size
, 0, sizeof(zones_size
));
58 * old: we can DMA to/from any address.put all page into ZONE_DMA
59 * We use only ZONE_NORMAL
61 zones_size
[ZONE_NORMAL
] = max_mapnr
;
63 free_area_init(zones_size
);
66 void __init
setup_memory(void)
69 unsigned long map_size
;
71 u32 kernel_align_start
, kernel_align_size
;
73 /* Find main memory where is the kernel */
74 for (i
= 0; i
< lmb
.memory
.cnt
; i
++) {
75 memory_start
= (u32
) lmb
.memory
.region
[i
].base
;
76 memory_end
= (u32
) lmb
.memory
.region
[i
].base
77 + (u32
) lmb
.memory
.region
[i
].size
;
78 if ((memory_start
<= (u32
)_text
) &&
79 ((u32
)_text
<= memory_end
)) {
80 memory_size
= memory_end
- memory_start
;
81 PAGE_OFFSET
= memory_start
;
82 printk(KERN_INFO
"%s: Main mem: 0x%x-0x%x, "
83 "size 0x%08x\n", __func__
, (u32
) memory_start
,
84 (u32
) memory_end
, (u32
) memory_size
);
89 if (!memory_start
|| !memory_end
) {
90 panic("%s: Missing memory setting 0x%08x-0x%08x\n",
91 __func__
, (u32
) memory_start
, (u32
) memory_end
);
94 /* reservation of region where is the kernel */
95 kernel_align_start
= PAGE_DOWN((u32
)_text
);
96 /* ALIGN can be remove because _end in vmlinux.lds.S is align */
97 kernel_align_size
= PAGE_UP((u32
)klimit
) - kernel_align_start
;
98 lmb_reserve(kernel_align_start
, kernel_align_size
);
99 printk(KERN_INFO
"%s: kernel addr=0x%08x-0x%08x size=0x%08x\n",
100 __func__
, kernel_align_start
, kernel_align_start
101 + kernel_align_size
, kernel_align_size
);
106 * start: base phys address of kernel - page align
107 * end: base phys address of kernel - page align
109 * min_low_pfn - the first page (mm/bootmem.c - node_boot_start)
111 * max_mapnr - the first unused page (mm/bootmem.c - node_low_pfn)
112 * num_physpages - number of all pages
115 /* memory start is from the kernel end (aligned) to higher addr */
116 min_low_pfn
= memory_start
>> PAGE_SHIFT
; /* minimum for allocation */
117 /* RAM is assumed contiguous */
118 num_physpages
= max_mapnr
= memory_size
>> PAGE_SHIFT
;
119 max_pfn
= max_low_pfn
= memory_end
>> PAGE_SHIFT
;
121 printk(KERN_INFO
"%s: max_mapnr: %#lx\n", __func__
, max_mapnr
);
122 printk(KERN_INFO
"%s: min_low_pfn: %#lx\n", __func__
, min_low_pfn
);
123 printk(KERN_INFO
"%s: max_low_pfn: %#lx\n", __func__
, max_low_pfn
);
126 * Find an area to use for the bootmem bitmap.
127 * We look for the first area which is at least
128 * 128kB in length (128kB is enough for a bitmap
129 * for 4GB of memory, using 4kB pages), plus 1 page
130 * (in case the address isn't page-aligned).
133 map_size
= init_bootmem_node(NODE_DATA(0), PFN_UP(TOPHYS((u32
)klimit
)),
134 min_low_pfn
, max_low_pfn
);
136 map_size
= init_bootmem_node(&contig_page_data
,
137 PFN_UP(TOPHYS((u32
)klimit
)), min_low_pfn
, max_low_pfn
);
139 lmb_reserve(PFN_UP(TOPHYS((u32
)klimit
)) << PAGE_SHIFT
, map_size
);
141 /* free bootmem is whole main memory */
142 free_bootmem(memory_start
, memory_size
);
144 /* reserve allocate blocks */
145 for (i
= 0; i
< lmb
.reserved
.cnt
; i
++) {
146 pr_debug("reserved %d - 0x%08x-0x%08x\n", i
,
147 (u32
) lmb
.reserved
.region
[i
].base
,
148 (u32
) lmb_size_bytes(&lmb
.reserved
, i
));
149 reserve_bootmem(lmb
.reserved
.region
[i
].base
,
150 lmb_size_bytes(&lmb
.reserved
, i
) - 1, BOOTMEM_DEFAULT
);
153 init_bootmem_done
= 1;
158 void free_init_pages(char *what
, unsigned long begin
, unsigned long end
)
162 for (addr
= begin
; addr
< end
; addr
+= PAGE_SIZE
) {
163 ClearPageReserved(virt_to_page(addr
));
164 init_page_count(virt_to_page(addr
));
165 memset((void *)addr
, 0xcc, PAGE_SIZE
);
169 printk(KERN_INFO
"Freeing %s: %ldk freed\n", what
, (end
- begin
) >> 10);
172 #ifdef CONFIG_BLK_DEV_INITRD
173 void free_initrd_mem(unsigned long start
, unsigned long end
)
176 for (; start
< end
; start
+= PAGE_SIZE
) {
177 ClearPageReserved(virt_to_page(start
));
178 init_page_count(virt_to_page(start
));
183 printk(KERN_NOTICE
"Freeing initrd memory: %dk freed\n", pages
);
187 void free_initmem(void)
189 free_init_pages("unused kernel memory",
190 (unsigned long)(&__init_begin
),
191 (unsigned long)(&__init_end
));
194 /* FIXME from arch/powerpc/mm/mem.c*/
197 printk(KERN_NOTICE
"%s\n", __func__
);
200 void __init
mem_init(void)
202 high_memory
= (void *)__va(memory_end
);
203 /* this will put all memory onto the freelists */
204 totalram_pages
+= free_all_bootmem();
206 printk(KERN_INFO
"Memory: %luk/%luk available\n",
207 (unsigned long) nr_free_pages() << (PAGE_SHIFT
-10),
208 num_physpages
<< (PAGE_SHIFT
-10));
215 /* Check against bounds of physical memory */
216 int ___range_ok(unsigned long addr
, unsigned long size
)
218 return ((addr
< memory_start
) ||
219 ((addr
+ size
) > memory_end
));
221 EXPORT_SYMBOL(___range_ok
);
224 int page_is_ram(unsigned long pfn
)
226 return pfn
< max_low_pfn
;
230 * Check for command-line options that affect what MMU_init will do.
232 static void mm_cmdline_setup(void)
234 unsigned long maxmem
= 0;
237 /* Look for mem= option on command line */
238 p
= strstr(cmd_line
, "mem=");
241 maxmem
= memparse(p
, &p
);
242 if (maxmem
&& memory_size
> maxmem
) {
243 memory_size
= maxmem
;
244 memory_end
= memory_start
+ memory_size
;
245 lmb
.memory
.region
[0].size
= memory_size
;
251 * MMU_init_hw does the chip-specific initialization of the MMU hardware.
253 static void __init
mmu_init_hw(void)
256 * The Zone Protection Register (ZPR) defines how protection will
257 * be applied to every page which is a member of a given zone. At
258 * present, we utilize only two of the zones.
259 * The zone index bits (of ZSEL) in the PTE are used for software
260 * indicators, except the LSB. For user access, zone 1 is used,
261 * for kernel access, zone 0 is used. We set all but zone 1
262 * to zero, allowing only kernel access as indicated in the PTE.
263 * For zone 1, we set a 01 binary (a value of 10 will not work)
264 * to allow user access as indicated in the PTE. This also allows
265 * kernel access as indicated in the PTE.
267 __asm__
__volatile__ ("ori r11, r0, 0x10000000;" \
273 * MMU_init sets up the basic memory mappings for the kernel,
274 * including both RAM and possibly some I/O regions,
275 * and sets up the page tables and the MMU hardware ready to go.
278 /* called from head.S */
279 asmlinkage
void __init
mmu_init(void)
281 unsigned int kstart
, ksize
;
283 if (!lmb
.reserved
.cnt
) {
284 printk(KERN_EMERG
"Error memory count\n");
285 machine_restart(NULL
);
288 if ((u32
) lmb
.memory
.region
[0].size
< 0x1000000) {
289 printk(KERN_EMERG
"Memory must be greater than 16MB\n");
290 machine_restart(NULL
);
292 /* Find main memory where the kernel is */
293 memory_start
= (u32
) lmb
.memory
.region
[0].base
;
294 memory_end
= (u32
) lmb
.memory
.region
[0].base
+
295 (u32
) lmb
.memory
.region
[0].size
;
296 memory_size
= memory_end
- memory_start
;
298 mm_cmdline_setup(); /* FIXME parse args from command line - not used */
301 * Map out the kernel text/data/bss from the available physical
304 kstart
= __pa(CONFIG_KERNEL_START
); /* kernel start */
306 ksize
= PAGE_ALIGN(((u32
)_end
- (u32
)CONFIG_KERNEL_START
));
307 lmb_reserve(kstart
, ksize
);
309 #if defined(CONFIG_BLK_DEV_INITRD)
310 /* Remove the init RAM disk from the available memory. */
311 /* if (initrd_start) {
312 mem_pieces_remove(&phys_avail, __pa(initrd_start),
313 initrd_end - initrd_start, 1);
315 #endif /* CONFIG_BLK_DEV_INITRD */
317 /* Initialize the MMU hardware */
320 /* Map in all of RAM starting at CONFIG_KERNEL_START */
323 #ifdef HIGHMEM_START_BOOL
324 ioremap_base
= HIGHMEM_START
;
326 ioremap_base
= 0xfe000000UL
; /* for now, could be 0xfffff000 */
327 #endif /* CONFIG_HIGHMEM */
328 ioremap_bot
= ioremap_base
;
330 /* Initialize the context management stuff */
334 /* This is only called until mem_init is done. */
335 void __init
*early_get_page(void)
338 if (init_bootmem_done
) {
339 p
= alloc_bootmem_pages(PAGE_SIZE
);
342 * Mem start + 32MB -> here is limit
343 * because of mem mapping from head.S
345 p
= __va(lmb_alloc_base(PAGE_SIZE
, PAGE_SIZE
,
346 memory_start
+ 0x2000000));
350 #endif /* CONFIG_MMU */
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