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b920de1b DH |
1 | /* MN10300 Memory management initialisation |
2 | * | |
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) | |
6 | * | |
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. | |
11 | */ | |
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> | |
b920de1b DH |
20 | #include <linux/fs.h> |
21 | #include <linux/mm.h> | |
22 | #include <linux/swap.h> | |
23 | #include <linux/smp.h> | |
24 | #include <linux/init.h> | |
25 | #include <linux/initrd.h> | |
26 | #include <linux/highmem.h> | |
27 | #include <linux/pagemap.h> | |
28 | #include <linux/bootmem.h> | |
5a0e3ad6 | 29 | #include <linux/gfp.h> |
b920de1b DH |
30 | |
31 | #include <asm/processor.h> | |
b920de1b DH |
32 | #include <asm/uaccess.h> |
33 | #include <asm/pgtable.h> | |
34 | #include <asm/pgalloc.h> | |
35 | #include <asm/dma.h> | |
36 | #include <asm/tlb.h> | |
37 | #include <asm/sections.h> | |
38 | ||
b920de1b DH |
39 | unsigned long highstart_pfn, highend_pfn; |
40 | ||
5a226c6f MS |
41 | #ifdef CONFIG_MN10300_HAS_ATOMIC_OPS_UNIT |
42 | static struct vm_struct user_iomap_vm; | |
43 | #endif | |
44 | ||
b920de1b DH |
45 | /* |
46 | * set up paging | |
47 | */ | |
48 | void __init paging_init(void) | |
49 | { | |
50 | unsigned long zones_size[MAX_NR_ZONES] = {0,}; | |
51 | pte_t *ppte; | |
52 | int loop; | |
53 | ||
54 | /* main kernel space -> RAM mapping is handled as 1:1 transparent by | |
55 | * the MMU */ | |
56 | memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir)); | |
57 | memset(kernel_vmalloc_ptes, 0, sizeof(kernel_vmalloc_ptes)); | |
58 | ||
59 | /* load the VMALLOC area PTE table addresses into the kernel PGD */ | |
60 | ppte = kernel_vmalloc_ptes; | |
61 | for (loop = VMALLOC_START / (PAGE_SIZE * PTRS_PER_PTE); | |
62 | loop < VMALLOC_END / (PAGE_SIZE * PTRS_PER_PTE); | |
63 | loop++ | |
64 | ) { | |
65 | set_pgd(swapper_pg_dir + loop, __pgd(__pa(ppte) | _PAGE_TABLE)); | |
66 | ppte += PAGE_SIZE / sizeof(pte_t); | |
67 | } | |
68 | ||
69 | /* declare the sizes of the RAM zones (only use the normal zone) */ | |
70 | zones_size[ZONE_NORMAL] = | |
3560e249 JW |
71 | contig_page_data.bdata->node_low_pfn - |
72 | contig_page_data.bdata->node_min_pfn; | |
b920de1b DH |
73 | |
74 | /* pass the memory from the bootmem allocator to the main allocator */ | |
75 | free_area_init(zones_size); | |
76 | ||
5a226c6f MS |
77 | #ifdef CONFIG_MN10300_HAS_ATOMIC_OPS_UNIT |
78 | /* The Atomic Operation Unit registers need to be mapped to userspace | |
79 | * for all processes. The following uses vm_area_register_early() to | |
80 | * reserve the first page of the vmalloc area and sets the pte for that | |
81 | * page. | |
82 | * | |
83 | * glibc hardcodes this virtual mapping, so we're pretty much stuck with | |
84 | * it from now on. | |
85 | */ | |
86 | user_iomap_vm.flags = VM_USERMAP; | |
87 | user_iomap_vm.size = 1 << PAGE_SHIFT; | |
88 | vm_area_register_early(&user_iomap_vm, PAGE_SIZE); | |
89 | ppte = kernel_vmalloc_ptes; | |
90 | set_pte(ppte, pfn_pte(USER_ATOMIC_OPS_PAGE_ADDR >> PAGE_SHIFT, | |
91 | PAGE_USERIO)); | |
92 | #endif | |
93 | ||
492e6751 | 94 | local_flush_tlb_all(); |
b920de1b DH |
95 | } |
96 | ||
97 | /* | |
98 | * transfer all the memory from the bootmem allocator to the runtime allocator | |
99 | */ | |
100 | void __init mem_init(void) | |
101 | { | |
102 | int codesize, reservedpages, datasize, initsize; | |
103 | int tmp; | |
104 | ||
292aa141 | 105 | BUG_ON(!mem_map); |
b920de1b | 106 | |
3560e249 | 107 | #define START_PFN (contig_page_data.bdata->node_min_pfn) |
b920de1b DH |
108 | #define MAX_LOW_PFN (contig_page_data.bdata->node_low_pfn) |
109 | ||
110 | max_mapnr = num_physpages = MAX_LOW_PFN - START_PFN; | |
111 | high_memory = (void *) __va(MAX_LOW_PFN * PAGE_SIZE); | |
112 | ||
113 | /* clear the zero-page */ | |
114 | memset(empty_zero_page, 0, PAGE_SIZE); | |
115 | ||
116 | /* this will put all low memory onto the freelists */ | |
0c988534 | 117 | free_all_bootmem(); |
b920de1b DH |
118 | |
119 | reservedpages = 0; | |
120 | for (tmp = 0; tmp < num_physpages; tmp++) | |
121 | if (PageReserved(&mem_map[tmp])) | |
122 | reservedpages++; | |
123 | ||
124 | codesize = (unsigned long) &_etext - (unsigned long) &_stext; | |
125 | datasize = (unsigned long) &_edata - (unsigned long) &_etext; | |
126 | initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; | |
127 | ||
128 | printk(KERN_INFO | |
129 | "Memory: %luk/%luk available" | |
130 | " (%dk kernel code, %dk reserved, %dk data, %dk init," | |
131 | " %ldk highmem)\n", | |
cc013a88 | 132 | nr_free_pages() << (PAGE_SHIFT - 10), |
b920de1b DH |
133 | max_mapnr << (PAGE_SHIFT - 10), |
134 | codesize >> 10, | |
135 | reservedpages << (PAGE_SHIFT - 10), | |
136 | datasize >> 10, | |
137 | initsize >> 10, | |
4b529401 | 138 | totalhigh_pages << (PAGE_SHIFT - 10)); |
b920de1b DH |
139 | } |
140 | ||
b920de1b DH |
141 | /* |
142 | * recycle memory containing stuff only required for initialisation | |
143 | */ | |
144 | void free_initmem(void) | |
145 | { | |
32ce0120 | 146 | free_initmem_default(POISON_FREE_INITMEM); |
b920de1b DH |
147 | } |
148 | ||
149 | /* | |
150 | * dispose of the memory on which the initial ramdisk resided | |
151 | */ | |
152 | #ifdef CONFIG_BLK_DEV_INITRD | |
153 | void free_initrd_mem(unsigned long start, unsigned long end) | |
154 | { | |
11199692 JL |
155 | free_reserved_area((void *)start, (void *)end, POISON_FREE_INITMEM, |
156 | "initrd"); | |
b920de1b DH |
157 | } |
158 | #endif |