blob: 5ac1fd30341bb29704bedabd63e43cc105e3f285 (
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
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
|
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* This file contains pgtable related functions for 64-bit machines.
*
* Derived from arch/ppc64/mm/init.c
* Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
*
* Modifications by Paul Mackerras (PowerMac) (paulus@samba.org)
* and Cort Dougan (PReP) (cort@cs.nmt.edu)
* Copyright (C) 1996 Paul Mackerras
*
* Derived from "arch/i386/mm/init.c"
* Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
*
* Dave Engebretsen <engebret@us.ibm.com>
* Rework for PPC64 port.
*/
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/export.h>
#include <linux/types.h>
#include <linux/mman.h>
#include <linux/mm.h>
#include <linux/swap.h>
#include <linux/stddef.h>
#include <linux/vmalloc.h>
#include <linux/slab.h>
#include <linux/hugetlb.h>
#include <asm/page.h>
#include <asm/mmu_context.h>
#include <asm/mmu.h>
#include <asm/smp.h>
#include <asm/machdep.h>
#include <asm/tlb.h>
#include <asm/processor.h>
#include <asm/cputable.h>
#include <asm/sections.h>
#include <asm/firmware.h>
#include <asm/dma.h>
#include <mm/mmu_decl.h>
#ifdef CONFIG_PPC_BOOK3S_64
/*
* partition table and process table for ISA 3.0
*/
struct prtb_entry *process_tb;
struct patb_entry *partition_tb;
/*
* page table size
*/
unsigned long __pte_index_size;
EXPORT_SYMBOL(__pte_index_size);
unsigned long __pmd_index_size;
EXPORT_SYMBOL(__pmd_index_size);
unsigned long __pud_index_size;
EXPORT_SYMBOL(__pud_index_size);
unsigned long __pgd_index_size;
EXPORT_SYMBOL(__pgd_index_size);
unsigned long __pud_cache_index;
EXPORT_SYMBOL(__pud_cache_index);
unsigned long __pte_table_size;
EXPORT_SYMBOL(__pte_table_size);
unsigned long __pmd_table_size;
EXPORT_SYMBOL(__pmd_table_size);
unsigned long __pud_table_size;
EXPORT_SYMBOL(__pud_table_size);
unsigned long __pgd_table_size;
EXPORT_SYMBOL(__pgd_table_size);
unsigned long __pmd_val_bits;
EXPORT_SYMBOL(__pmd_val_bits);
unsigned long __pud_val_bits;
EXPORT_SYMBOL(__pud_val_bits);
unsigned long __pgd_val_bits;
EXPORT_SYMBOL(__pgd_val_bits);
unsigned long __kernel_virt_start;
EXPORT_SYMBOL(__kernel_virt_start);
unsigned long __vmalloc_start;
EXPORT_SYMBOL(__vmalloc_start);
unsigned long __vmalloc_end;
EXPORT_SYMBOL(__vmalloc_end);
unsigned long __kernel_io_start;
EXPORT_SYMBOL(__kernel_io_start);
unsigned long __kernel_io_end;
struct page *vmemmap;
EXPORT_SYMBOL(vmemmap);
unsigned long __pte_frag_nr;
EXPORT_SYMBOL(__pte_frag_nr);
unsigned long __pte_frag_size_shift;
EXPORT_SYMBOL(__pte_frag_size_shift);
#endif
#ifndef __PAGETABLE_PUD_FOLDED
/* 4 level page table */
struct page *p4d_page(p4d_t p4d)
{
if (p4d_is_leaf(p4d)) {
if (!IS_ENABLED(CONFIG_HAVE_ARCH_HUGE_VMAP))
VM_WARN_ON(!p4d_huge(p4d));
return pte_page(p4d_pte(p4d));
}
return virt_to_page(p4d_pgtable(p4d));
}
#endif
struct page *pud_page(pud_t pud)
{
if (pud_is_leaf(pud)) {
if (!IS_ENABLED(CONFIG_HAVE_ARCH_HUGE_VMAP))
VM_WARN_ON(!pud_huge(pud));
return pte_page(pud_pte(pud));
}
return virt_to_page(pud_pgtable(pud));
}
/*
* For hugepage we have pfn in the pmd, we use PTE_RPN_SHIFT bits for flags
* For PTE page, we have a PTE_FRAG_SIZE (4K) aligned virtual address.
*/
struct page *pmd_page(pmd_t pmd)
{
if (pmd_is_leaf(pmd)) {
/*
* vmalloc_to_page may be called on any vmap address (not only
* vmalloc), and it uses pmd_page() etc., when huge vmap is
* enabled so these checks can't be used.
*/
if (!IS_ENABLED(CONFIG_HAVE_ARCH_HUGE_VMAP))
VM_WARN_ON(!(pmd_large(pmd) || pmd_huge(pmd)));
return pte_page(pmd_pte(pmd));
}
return virt_to_page(pmd_page_vaddr(pmd));
}
#ifdef CONFIG_STRICT_KERNEL_RWX
void mark_rodata_ro(void)
{
if (!mmu_has_feature(MMU_FTR_KERNEL_RO)) {
pr_warn("Warning: Unable to mark rodata read only on this CPU.\n");
return;
}
if (radix_enabled())
radix__mark_rodata_ro();
else
hash__mark_rodata_ro();
// mark_initmem_nx() should have already run by now
ptdump_check_wx();
}
void mark_initmem_nx(void)
{
if (radix_enabled())
radix__mark_initmem_nx();
else
hash__mark_initmem_nx();
}
#endif
|
