summaryrefslogtreecommitdiff
path: root/arch/nios2/mm/init.c
blob: 7bc82ee889c950605c9581e51f2a59a261d42056 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
/*
 * Copyright (C) 2013 Altera Corporation
 * Copyright (C) 2010 Tobias Klauser <tklauser@distanz.ch>
 * Copyright (C) 2009 Wind River Systems Inc
 *   Implemented by fredrik.markstrom@gmail.com and ivarholmqvist@gmail.com
 * Copyright (C) 2004 Microtronix Datacom Ltd
 *
 * based on arch/m68k/mm/init.c
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License. See the file "COPYING" in the main directory of this archive
 * for more details.
 */

#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/types.h>
#include <linux/ptrace.h>
#include <linux/mman.h>
#include <linux/mm.h>
#include <linux/init.h>
#include <linux/pagemap.h>
#include <linux/memblock.h>
#include <linux/slab.h>
#include <linux/binfmts.h>

#include <asm/setup.h>
#include <asm/page.h>
#include <asm/sections.h>
#include <asm/tlb.h>
#include <asm/mmu_context.h>
#include <asm/cpuinfo.h>
#include <asm/processor.h>

pgd_t *pgd_current;

/*
 * paging_init() continues the virtual memory environment setup which
 * was begun by the code in arch/head.S.
 * The parameters are pointers to where to stick the starting and ending
 * addresses of available kernel virtual memory.
 */
void __init paging_init(void)
{
	unsigned long max_zone_pfn[MAX_NR_ZONES] = { 0 };

	pagetable_init();
	pgd_current = swapper_pg_dir;

	max_zone_pfn[ZONE_NORMAL] = max_mapnr;

	/* pass the memory from the bootmem allocator to the main allocator */
	free_area_init(max_zone_pfn);

	flush_dcache_range((unsigned long)empty_zero_page,
			(unsigned long)empty_zero_page + PAGE_SIZE);
}

void __init mem_init(void)
{
	unsigned long end_mem   = memory_end; /* this must not include
						kernel stack at top */

	pr_debug("mem_init: start=%lx, end=%lx\n", memory_start, memory_end);

	end_mem &= PAGE_MASK;
	high_memory = __va(end_mem);

	/* this will put all memory onto the freelists */
	memblock_free_all();
}

void __init mmu_init(void)
{
	flush_tlb_all();
}

pgd_t swapper_pg_dir[PTRS_PER_PGD] __aligned(PAGE_SIZE);
pte_t invalid_pte_table[PTRS_PER_PTE] __aligned(PAGE_SIZE);
static struct page *kuser_page[1];

static int alloc_kuser_page(void)
{
	extern char __kuser_helper_start[], __kuser_helper_end[];
	int kuser_sz = __kuser_helper_end - __kuser_helper_start;
	unsigned long vpage;

	vpage = get_zeroed_page(GFP_ATOMIC);
	if (!vpage)
		return -ENOMEM;

	/* Copy kuser helpers */
	memcpy((void *)vpage, __kuser_helper_start, kuser_sz);

	flush_icache_range(vpage, vpage + KUSER_SIZE);
	kuser_page[0] = virt_to_page(vpage);

	return 0;
}
arch_initcall(alloc_kuser_page);

int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
{
	struct mm_struct *mm = current->mm;
	int ret;

	mmap_write_lock(mm);

	/* Map kuser helpers to user space address */
	ret = install_special_mapping(mm, KUSER_BASE, KUSER_SIZE,
				      VM_READ | VM_EXEC | VM_MAYREAD |
				      VM_MAYEXEC, kuser_page);

	mmap_write_unlock(mm);

	return ret;
}

const char *arch_vma_name(struct vm_area_struct *vma)
{
	return (vma->vm_start == KUSER_BASE) ? "[kuser]" : NULL;
}

static const pgprot_t protection_map[16] = {
	[VM_NONE]					= MKP(0, 0, 0),
	[VM_READ]					= MKP(0, 0, 1),
	[VM_WRITE]					= MKP(0, 0, 0),
	[VM_WRITE | VM_READ]				= MKP(0, 0, 1),
	[VM_EXEC]					= MKP(1, 0, 0),
	[VM_EXEC | VM_READ]				= MKP(1, 0, 1),
	[VM_EXEC | VM_WRITE]				= MKP(1, 0, 0),
	[VM_EXEC | VM_WRITE | VM_READ]			= MKP(1, 0, 1),
	[VM_SHARED]					= MKP(0, 0, 0),
	[VM_SHARED | VM_READ]				= MKP(0, 0, 1),
	[VM_SHARED | VM_WRITE]				= MKP(0, 1, 0),
	[VM_SHARED | VM_WRITE | VM_READ]		= MKP(0, 1, 1),
	[VM_SHARED | VM_EXEC]				= MKP(1, 0, 0),
	[VM_SHARED | VM_EXEC | VM_READ]			= MKP(1, 0, 1),
	[VM_SHARED | VM_EXEC | VM_WRITE]		= MKP(1, 1, 0),
	[VM_SHARED | VM_EXEC | VM_WRITE | VM_READ]	= MKP(1, 1, 1)
};
DECLARE_VM_GET_PAGE_PROT