1 /* 1
2 * Copyright (C) 2013 Altera Corporation
3 * Copyright (C) 2010 Tobias Klauser <tklauser
4 * Copyright (C) 2009 Wind River Systems Inc
5 * Implemented by fredrik.markstrom@gmail.co
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 condi
11 * License. See the file "COPYING" in the main
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>
26 #include <linux/memblock.h>
27 #include <linux/slab.h>
28 #include <linux/binfmts.h>
29 #include <linux/execmem.h>
30
31 #include <asm/setup.h>
32 #include <asm/page.h>
33 #include <asm/sections.h>
34 #include <asm/tlb.h>
35 #include <asm/mmu_context.h>
36 #include <asm/cpuinfo.h>
37 #include <asm/processor.h>
38
39 pgd_t *pgd_current;
40
41 /*
42 * paging_init() continues the virtual memory
43 * was begun by the code in arch/head.S.
44 * The parameters are pointers to where to sti
45 * addresses of available kernel virtual memor
46 */
47 void __init paging_init(void)
48 {
49 unsigned long max_zone_pfn[MAX_NR_ZONE
50
51 pagetable_init();
52 pgd_current = swapper_pg_dir;
53
54 max_zone_pfn[ZONE_NORMAL] = max_mapnr;
55
56 /* pass the memory from the bootmem al
57 free_area_init(max_zone_pfn);
58
59 flush_dcache_range((unsigned long)empt
60 (unsigned long)empty_z
61 }
62
63 void __init mem_init(void)
64 {
65 unsigned long end_mem = memory_end;
66
67
68 pr_debug("mem_init: start=%lx, end=%lx
69
70 end_mem &= PAGE_MASK;
71 high_memory = __va(end_mem);
72
73 /* this will put all memory onto the f
74 memblock_free_all();
75 }
76
77 void __init mmu_init(void)
78 {
79 flush_tlb_all();
80 }
81
82 pgd_t swapper_pg_dir[PTRS_PER_PGD] __aligned(P
83 pte_t invalid_pte_table[PTRS_PER_PTE] __aligne
84 static struct page *kuser_page[1];
85 static struct vm_special_mapping vdso_mapping
86 .name = "[vdso]",
87 .pages = kuser_page,
88 };
89
90 static int alloc_kuser_page(void)
91 {
92 extern char __kuser_helper_start[], __
93 int kuser_sz = __kuser_helper_end - __
94 unsigned long vpage;
95
96 vpage = get_zeroed_page(GFP_ATOMIC);
97 if (!vpage)
98 return -ENOMEM;
99
100 /* Copy kuser helpers */
101 memcpy((void *)vpage, __kuser_helper_s
102
103 flush_icache_range(vpage, vpage + KUSE
104 kuser_page[0] = virt_to_page(vpage);
105
106 return 0;
107 }
108 arch_initcall(alloc_kuser_page);
109
110 int arch_setup_additional_pages(struct linux_b
111 {
112 struct mm_struct *mm = current->mm;
113 struct vm_area_struct *vma;
114
115 mmap_write_lock(mm);
116
117 /* Map kuser helpers to user space add
118 vma = _install_special_mapping(mm, KUS
119 VM_READ
120 VM_MAYEX
121
122 mmap_write_unlock(mm);
123
124 return IS_ERR(vma) ? PTR_ERR(vma) : 0;
125 }
126
127 const char *arch_vma_name(struct vm_area_struc
128 {
129 return (vma->vm_start == KUSER_BASE) ?
130 }
131
132 static const pgprot_t protection_map[16] = {
133 [VM_NONE]
134 [VM_READ]
135 [VM_WRITE]
136 [VM_WRITE | VM_READ]
137 [VM_EXEC]
138 [VM_EXEC | VM_READ]
139 [VM_EXEC | VM_WRITE]
140 [VM_EXEC | VM_WRITE | VM_READ]
141 [VM_SHARED]
142 [VM_SHARED | VM_READ]
143 [VM_SHARED | VM_WRITE]
144 [VM_SHARED | VM_WRITE | VM_READ]
145 [VM_SHARED | VM_EXEC]
146 [VM_SHARED | VM_EXEC | VM_READ]
147 [VM_SHARED | VM_EXEC | VM_WRITE]
148 [VM_SHARED | VM_EXEC | VM_WRITE | VM_R
149 };
150 DECLARE_VM_GET_PAGE_PROT
151
152 #ifdef CONFIG_EXECMEM
153 static struct execmem_info execmem_info __ro_a
154
155 struct execmem_info __init *execmem_arch_setup
156 {
157 execmem_info = (struct execmem_info){
158 .ranges = {
159 [EXECMEM_DEFAULT] = {
160 .start = MODU
161 .end = MODU
162 .pgprot = PAGE
163 .alignment = 1
164 },
165 },
166 };
167
168 return &execmem_info;
169 }
170 #endif /* CONFIG_EXECMEM */
171
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.