1 /*
2 * Copyright (C) 2012 ARM Ltd.
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License
14 * along with this program. If not, see <http://www.gnu.org/licenses/>.
15 */
16 #ifndef __ASM_MMU_H
17 #define __ASM_MMU_H
18
19 #define MMCF_AARCH32 0x1 /* mm context flag for AArch32 executables */
20 #define USER_ASID_FLAG (UL(1) << 48)
21 #define TTBR_ASID_MASK (UL(0xffff) << 48)
22
23 #ifndef __ASSEMBLY__
24
25 typedef struct {
26 atomic64_t id;
27 void *vdso;
28 unsigned long flags;
29 } mm_context_t;
30
31 /*
32 * This macro is only used by the TLBI code, which cannot race with an
33 * ASID change and therefore doesn't need to reload the counter using
34 * atomic64_read.
35 */
36 #define ASID(mm) ((mm)->context.id.counter & 0xffff)
37
arm64_kernel_unmapped_at_el0(void)38 static inline bool arm64_kernel_unmapped_at_el0(void)
39 {
40 return IS_ENABLED(CONFIG_UNMAP_KERNEL_AT_EL0) &&
41 cpus_have_const_cap(ARM64_UNMAP_KERNEL_AT_EL0);
42 }
43
44 typedef void (*bp_hardening_cb_t)(void);
45
46 struct bp_hardening_data {
47 int hyp_vectors_slot;
48 bp_hardening_cb_t fn;
49 };
50
51 #ifdef CONFIG_HARDEN_BRANCH_PREDICTOR
52 extern char __bp_harden_hyp_vecs_start[], __bp_harden_hyp_vecs_end[];
53
54 DECLARE_PER_CPU_READ_MOSTLY(struct bp_hardening_data, bp_hardening_data);
55
arm64_get_bp_hardening_data(void)56 static inline struct bp_hardening_data *arm64_get_bp_hardening_data(void)
57 {
58 return this_cpu_ptr(&bp_hardening_data);
59 }
60
arm64_apply_bp_hardening(void)61 static inline void arm64_apply_bp_hardening(void)
62 {
63 struct bp_hardening_data *d;
64
65 if (!cpus_have_const_cap(ARM64_HARDEN_BRANCH_PREDICTOR))
66 return;
67
68 d = arm64_get_bp_hardening_data();
69 if (d->fn)
70 d->fn();
71 }
72 #else
arm64_get_bp_hardening_data(void)73 static inline struct bp_hardening_data *arm64_get_bp_hardening_data(void)
74 {
75 return NULL;
76 }
77
arm64_apply_bp_hardening(void)78 static inline void arm64_apply_bp_hardening(void) { }
79 #endif /* CONFIG_HARDEN_BRANCH_PREDICTOR */
80
81 extern void paging_init(void);
82 extern void bootmem_init(void);
83 extern void __iomem *early_io_map(phys_addr_t phys, unsigned long virt);
84 extern void init_mem_pgprot(void);
85 extern void create_pgd_mapping(struct mm_struct *mm, phys_addr_t phys,
86 unsigned long virt, phys_addr_t size,
87 pgprot_t prot, bool page_mappings_only);
88 extern void *fixmap_remap_fdt(phys_addr_t dt_phys);
89 extern void mark_linear_text_alias_ro(void);
90
91 #endif /* !__ASSEMBLY__ */
92 #endif
93