1 /* MN10300 Memory management initialisation
3 * Copyright (C) 2007 Matsushita Electric Industrial Co., Ltd.
4 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
5 * Modified by David Howells (dhowells@redhat.com)
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public Licence
9 * as published by the Free Software Foundation; either version
10 * 2 of the Licence, or (at your option) any later version.
12 #include <linux/signal.h>
13 #include <linux/sched.h>
14 #include <linux/kernel.h>
15 #include <linux/errno.h>
16 #include <linux/string.h>
17 #include <linux/types.h>
18 #include <linux/ptrace.h>
19 #include <linux/mman.h>
20 #include <linux/slab.h>
23 #include <linux/swap.h>
24 #include <linux/smp.h>
25 #include <linux/init.h>
26 #include <linux/initrd.h>
27 #include <linux/highmem.h>
28 #include <linux/pagemap.h>
29 #include <linux/bootmem.h>
31 #include <asm/processor.h>
32 #include <asm/system.h>
33 #include <asm/uaccess.h>
34 #include <asm/pgtable.h>
35 #include <asm/pgalloc.h>
38 #include <asm/sections.h>
40 DEFINE_PER_CPU(struct mmu_gather
, mmu_gathers
);
42 unsigned long highstart_pfn
, highend_pfn
;
47 void __init
paging_init(void)
49 unsigned long zones_size
[MAX_NR_ZONES
] = {0,};
53 /* main kernel space -> RAM mapping is handled as 1:1 transparent by
55 memset(swapper_pg_dir
, 0, sizeof(swapper_pg_dir
));
56 memset(kernel_vmalloc_ptes
, 0, sizeof(kernel_vmalloc_ptes
));
58 /* load the VMALLOC area PTE table addresses into the kernel PGD */
59 ppte
= kernel_vmalloc_ptes
;
60 for (loop
= VMALLOC_START
/ (PAGE_SIZE
* PTRS_PER_PTE
);
61 loop
< VMALLOC_END
/ (PAGE_SIZE
* PTRS_PER_PTE
);
64 set_pgd(swapper_pg_dir
+ loop
, __pgd(__pa(ppte
) | _PAGE_TABLE
));
65 ppte
+= PAGE_SIZE
/ sizeof(pte_t
);
68 /* declare the sizes of the RAM zones (only use the normal zone) */
69 zones_size
[ZONE_NORMAL
] =
70 contig_page_data
.bdata
->node_low_pfn
-
71 contig_page_data
.bdata
->node_min_pfn
;
73 /* pass the memory from the bootmem allocator to the main allocator */
74 free_area_init(zones_size
);
80 * transfer all the memory from the bootmem allocator to the runtime allocator
82 void __init
mem_init(void)
84 int codesize
, reservedpages
, datasize
, initsize
;
90 #define START_PFN (contig_page_data.bdata->node_min_pfn)
91 #define MAX_LOW_PFN (contig_page_data.bdata->node_low_pfn)
93 max_mapnr
= num_physpages
= MAX_LOW_PFN
- START_PFN
;
94 high_memory
= (void *) __va(MAX_LOW_PFN
* PAGE_SIZE
);
96 /* clear the zero-page */
97 memset(empty_zero_page
, 0, PAGE_SIZE
);
99 /* this will put all low memory onto the freelists */
100 totalram_pages
+= free_all_bootmem();
103 for (tmp
= 0; tmp
< num_physpages
; tmp
++)
104 if (PageReserved(&mem_map
[tmp
]))
107 codesize
= (unsigned long) &_etext
- (unsigned long) &_stext
;
108 datasize
= (unsigned long) &_edata
- (unsigned long) &_etext
;
109 initsize
= (unsigned long) &__init_end
- (unsigned long) &__init_begin
;
112 "Memory: %luk/%luk available"
113 " (%dk kernel code, %dk reserved, %dk data, %dk init,"
115 (unsigned long) nr_free_pages() << (PAGE_SHIFT
- 10),
116 max_mapnr
<< (PAGE_SHIFT
- 10),
118 reservedpages
<< (PAGE_SHIFT
- 10),
121 (unsigned long) (totalhigh_pages
<< (PAGE_SHIFT
- 10))
128 void free_init_pages(char *what
, unsigned long begin
, unsigned long end
)
132 for (addr
= begin
; addr
< end
; addr
+= PAGE_SIZE
) {
133 ClearPageReserved(virt_to_page(addr
));
134 init_page_count(virt_to_page(addr
));
135 memset((void *) addr
, 0xcc, PAGE_SIZE
);
139 printk(KERN_INFO
"Freeing %s: %ldk freed\n", what
, (end
- begin
) >> 10);
143 * recycle memory containing stuff only required for initialisation
145 void free_initmem(void)
147 free_init_pages("unused kernel memory",
148 (unsigned long) &__init_begin
,
149 (unsigned long) &__init_end
);
153 * dispose of the memory on which the initial ramdisk resided
155 #ifdef CONFIG_BLK_DEV_INITRD
156 void free_initrd_mem(unsigned long start
, unsigned long end
)
158 free_init_pages("initrd memory", start
, end
);