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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>
26#include <linux/memblock.h>
27#include <linux/slab.h>
28#include <linux/binfmts.h>
29
30#include <asm/setup.h>
31#include <asm/page.h>
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
38pgd_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 */
46void __init paging_init(void)
47{
48 unsigned long max_zone_pfn[MAX_NR_ZONES] = { 0 };
49
50 pagetable_init();
51 pgd_current = swapper_pg_dir;
52
53 max_zone_pfn[ZONE_NORMAL] = max_mapnr;
54
55 /* pass the memory from the bootmem allocator to the main allocator */
56 free_area_init(max_zone_pfn);
57
58 flush_dcache_range((unsigned long)empty_zero_page,
59 (unsigned long)empty_zero_page + PAGE_SIZE);
60}
61
62void __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 */
73 memblock_free_all();
74}
75
76void __init mmu_init(void)
77{
78 flush_tlb_all();
79}
80
81pgd_t swapper_pg_dir[PTRS_PER_PGD] __aligned(PAGE_SIZE);
82pte_t invalid_pte_table[PTRS_PER_PTE] __aligned(PAGE_SIZE);
83static struct page *kuser_page[1];
84
85static int alloc_kuser_page(void)
86{
87 extern char __kuser_helper_start[], __kuser_helper_end[];
88 int kuser_sz = __kuser_helper_end - __kuser_helper_start;
89 unsigned long vpage;
90
91 vpage = get_zeroed_page(GFP_ATOMIC);
92 if (!vpage)
93 return -ENOMEM;
94
95 /* Copy kuser helpers */
96 memcpy((void *)vpage, __kuser_helper_start, kuser_sz);
97
98 flush_icache_range(vpage, vpage + KUSER_SIZE);
99 kuser_page[0] = virt_to_page(vpage);
100
101 return 0;
102}
103arch_initcall(alloc_kuser_page);
104
105int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
106{
107 struct mm_struct *mm = current->mm;
108 int ret;
109
110 mmap_write_lock(mm);
111
112 /* Map kuser helpers to user space address */
113 ret = install_special_mapping(mm, KUSER_BASE, KUSER_SIZE,
114 VM_READ | VM_EXEC | VM_MAYREAD |
115 VM_MAYEXEC, kuser_page);
116
117 mmap_write_unlock(mm);
118
119 return ret;
120}
121
122const char *arch_vma_name(struct vm_area_struct *vma)
123{
124 return (vma->vm_start == KUSER_BASE) ? "[kuser]" : NULL;
125}
126
127static const pgprot_t protection_map[16] = {
128 [VM_NONE] = MKP(0, 0, 0),
129 [VM_READ] = MKP(0, 0, 1),
130 [VM_WRITE] = MKP(0, 0, 0),
131 [VM_WRITE | VM_READ] = MKP(0, 0, 1),
132 [VM_EXEC] = MKP(1, 0, 0),
133 [VM_EXEC | VM_READ] = MKP(1, 0, 1),
134 [VM_EXEC | VM_WRITE] = MKP(1, 0, 0),
135 [VM_EXEC | VM_WRITE | VM_READ] = MKP(1, 0, 1),
136 [VM_SHARED] = MKP(0, 0, 0),
137 [VM_SHARED | VM_READ] = MKP(0, 0, 1),
138 [VM_SHARED | VM_WRITE] = MKP(0, 1, 0),
139 [VM_SHARED | VM_WRITE | VM_READ] = MKP(0, 1, 1),
140 [VM_SHARED | VM_EXEC] = MKP(1, 0, 0),
141 [VM_SHARED | VM_EXEC | VM_READ] = MKP(1, 0, 1),
142 [VM_SHARED | VM_EXEC | VM_WRITE] = MKP(1, 1, 0),
143 [VM_SHARED | VM_EXEC | VM_WRITE | VM_READ] = MKP(1, 1, 1)
144};
145DECLARE_VM_GET_PAGE_PROT
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>
26#include <linux/bootmem.h>
27#include <linux/slab.h>
28#include <linux/binfmts.h>
29
30#include <asm/setup.h>
31#include <asm/page.h>
32#include <asm/pgtable.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
39pgd_t *pgd_current;
40
41/*
42 * paging_init() continues the virtual memory environment setup which
43 * was begun by the code in arch/head.S.
44 * The parameters are pointers to where to stick the starting and ending
45 * addresses of available kernel virtual memory.
46 */
47void __init paging_init(void)
48{
49 unsigned long zones_size[MAX_NR_ZONES];
50
51 memset(zones_size, 0, sizeof(zones_size));
52
53 pagetable_init();
54 pgd_current = swapper_pg_dir;
55
56 zones_size[ZONE_NORMAL] = max_mapnr;
57
58 /* pass the memory from the bootmem allocator to the main allocator */
59 free_area_init(zones_size);
60
61 flush_dcache_range((unsigned long)empty_zero_page,
62 (unsigned long)empty_zero_page + PAGE_SIZE);
63}
64
65void __init mem_init(void)
66{
67 unsigned long end_mem = memory_end; /* this must not include
68 kernel stack at top */
69
70 pr_debug("mem_init: start=%lx, end=%lx\n", memory_start, memory_end);
71
72 end_mem &= PAGE_MASK;
73 high_memory = __va(end_mem);
74
75 /* this will put all memory onto the freelists */
76 free_all_bootmem();
77 mem_init_print_info(NULL);
78}
79
80void __init mmu_init(void)
81{
82 flush_tlb_all();
83}
84
85#ifdef CONFIG_BLK_DEV_INITRD
86void __init free_initrd_mem(unsigned long start, unsigned long end)
87{
88 free_reserved_area((void *)start, (void *)end, -1, "initrd");
89}
90#endif
91
92void __ref free_initmem(void)
93{
94 free_initmem_default(-1);
95}
96
97#define __page_aligned(order) __aligned(PAGE_SIZE << (order))
98pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned(PGD_ORDER);
99pte_t invalid_pte_table[PTRS_PER_PTE] __page_aligned(PTE_ORDER);
100static struct page *kuser_page[1];
101
102static int alloc_kuser_page(void)
103{
104 extern char __kuser_helper_start[], __kuser_helper_end[];
105 int kuser_sz = __kuser_helper_end - __kuser_helper_start;
106 unsigned long vpage;
107
108 vpage = get_zeroed_page(GFP_ATOMIC);
109 if (!vpage)
110 return -ENOMEM;
111
112 /* Copy kuser helpers */
113 memcpy((void *)vpage, __kuser_helper_start, kuser_sz);
114
115 flush_icache_range(vpage, vpage + KUSER_SIZE);
116 kuser_page[0] = virt_to_page(vpage);
117
118 return 0;
119}
120arch_initcall(alloc_kuser_page);
121
122int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
123{
124 struct mm_struct *mm = current->mm;
125 int ret;
126
127 down_write(&mm->mmap_sem);
128
129 /* Map kuser helpers to user space address */
130 ret = install_special_mapping(mm, KUSER_BASE, KUSER_SIZE,
131 VM_READ | VM_EXEC | VM_MAYREAD |
132 VM_MAYEXEC, kuser_page);
133
134 up_write(&mm->mmap_sem);
135
136 return ret;
137}
138
139const char *arch_vma_name(struct vm_area_struct *vma)
140{
141 return (vma->vm_start == KUSER_BASE) ? "[kuser]" : NULL;
142}