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1 | /* |
2 | * Copyright (C) 2013 Altera Corporation | |
3 | * Copyright (C) 2010 Tobias Klauser <tklauser@distanz.ch> | |
4 | * Copyright (C) 2009 Wind River Systems Inc | |
5 | * Implemented by fredrik.markstrom@gmail.com and ivarholmqvist@gmail.com | |
6 | * Copyright (C) 2004 Microtronix Datacom Ltd | |
7 | * | |
8 | * based on arch/m68k/mm/init.c | |
9 | * | |
10 | * This file is subject to the terms and conditions of the GNU General Public | |
11 | * License. See the file "COPYING" in the main directory of this archive | |
12 | * for more details. | |
13 | */ | |
14 | ||
15 | #include <linux/signal.h> | |
16 | #include <linux/sched.h> | |
17 | #include <linux/kernel.h> | |
18 | #include <linux/errno.h> | |
19 | #include <linux/string.h> | |
20 | #include <linux/types.h> | |
21 | #include <linux/ptrace.h> | |
22 | #include <linux/mman.h> | |
23 | #include <linux/mm.h> | |
24 | #include <linux/init.h> | |
25 | #include <linux/pagemap.h> | |
57c8a661 | 26 | #include <linux/memblock.h> |
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27 | #include <linux/slab.h> |
28 | #include <linux/binfmts.h> | |
29 | ||
30 | #include <asm/setup.h> | |
31 | #include <asm/page.h> | |
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32 | #include <asm/sections.h> |
33 | #include <asm/tlb.h> | |
34 | #include <asm/mmu_context.h> | |
35 | #include <asm/cpuinfo.h> | |
36 | #include <asm/processor.h> | |
37 | ||
38 | pgd_t *pgd_current; | |
39 | ||
40 | /* | |
41 | * paging_init() continues the virtual memory environment setup which | |
42 | * was begun by the code in arch/head.S. | |
43 | * The parameters are pointers to where to stick the starting and ending | |
44 | * addresses of available kernel virtual memory. | |
45 | */ | |
46 | void __init paging_init(void) | |
47 | { | |
fa3354e4 | 48 | unsigned long max_zone_pfn[MAX_NR_ZONES] = { 0 }; |
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49 | |
50 | pagetable_init(); | |
51 | pgd_current = swapper_pg_dir; | |
52 | ||
fa3354e4 | 53 | max_zone_pfn[ZONE_NORMAL] = max_mapnr; |
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54 | |
55 | /* pass the memory from the bootmem allocator to the main allocator */ | |
fa3354e4 | 56 | free_area_init(max_zone_pfn); |
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57 | |
58 | flush_dcache_range((unsigned long)empty_zero_page, | |
59 | (unsigned long)empty_zero_page + PAGE_SIZE); | |
60 | } | |
61 | ||
62 | void __init mem_init(void) | |
63 | { | |
64 | unsigned long end_mem = memory_end; /* this must not include | |
65 | kernel stack at top */ | |
66 | ||
67 | pr_debug("mem_init: start=%lx, end=%lx\n", memory_start, memory_end); | |
68 | ||
69 | end_mem &= PAGE_MASK; | |
70 | high_memory = __va(end_mem); | |
71 | ||
72 | /* this will put all memory onto the freelists */ | |
c6ffc5ca | 73 | memblock_free_all(); |
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74 | mem_init_print_info(NULL); |
75 | } | |
76 | ||
77 | void __init mmu_init(void) | |
78 | { | |
79 | flush_tlb_all(); | |
80 | } | |
81 | ||
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82 | #define __page_aligned(order) __aligned(PAGE_SIZE << (order)) |
83 | pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned(PGD_ORDER); | |
84 | pte_t invalid_pte_table[PTRS_PER_PTE] __page_aligned(PTE_ORDER); | |
85 | static struct page *kuser_page[1]; | |
86 | ||
87 | static int alloc_kuser_page(void) | |
88 | { | |
89 | extern char __kuser_helper_start[], __kuser_helper_end[]; | |
90 | int kuser_sz = __kuser_helper_end - __kuser_helper_start; | |
91 | unsigned long vpage; | |
92 | ||
93 | vpage = get_zeroed_page(GFP_ATOMIC); | |
94 | if (!vpage) | |
95 | return -ENOMEM; | |
96 | ||
97 | /* Copy kuser helpers */ | |
98 | memcpy((void *)vpage, __kuser_helper_start, kuser_sz); | |
99 | ||
100 | flush_icache_range(vpage, vpage + KUSER_SIZE); | |
101 | kuser_page[0] = virt_to_page(vpage); | |
102 | ||
103 | return 0; | |
104 | } | |
105 | arch_initcall(alloc_kuser_page); | |
106 | ||
107 | int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp) | |
108 | { | |
109 | struct mm_struct *mm = current->mm; | |
110 | int ret; | |
111 | ||
d8ed45c5 | 112 | mmap_write_lock(mm); |
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113 | |
114 | /* Map kuser helpers to user space address */ | |
115 | ret = install_special_mapping(mm, KUSER_BASE, KUSER_SIZE, | |
116 | VM_READ | VM_EXEC | VM_MAYREAD | | |
117 | VM_MAYEXEC, kuser_page); | |
118 | ||
d8ed45c5 | 119 | mmap_write_unlock(mm); |
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120 | |
121 | return ret; | |
122 | } | |
123 | ||
124 | const char *arch_vma_name(struct vm_area_struct *vma) | |
125 | { | |
126 | return (vma->vm_start == KUSER_BASE) ? "[kuser]" : NULL; | |
127 | } |