2 * Copyright (C) 2012 ARM Ltd.
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.
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.
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/>.
19 #define MMCF_AARCH32 0x1 /* mm context flag for AArch32 executables */
20 #define USER_ASID_BIT 48
21 #define USER_ASID_FLAG (UL(1) << USER_ASID_BIT)
22 #define TTBR_ASID_MASK (UL(0xffff) << 48)
24 #define BP_HARDEN_EL2_SLOTS 4
35 * This macro is only used by the TLBI code, which cannot race with an
36 * ASID change and therefore doesn't need to reload the counter using
39 #define ASID(mm) ((mm)->context.id.counter & 0xffff)
41 static __always_inline bool arm64_kernel_unmapped_at_el0(void)
43 return IS_ENABLED(CONFIG_UNMAP_KERNEL_AT_EL0) &&
44 cpus_have_const_cap(ARM64_UNMAP_KERNEL_AT_EL0);
47 typedef void (*bp_hardening_cb_t)(void);
49 struct bp_hardening_data {
54 * template_start is only used by the BHB mitigation to identify the
55 * hyp_vectors_slot sequence.
57 const char *template_start;
60 #if (defined(CONFIG_HARDEN_BRANCH_PREDICTOR) || \
61 defined(CONFIG_HARDEN_EL2_VECTORS))
62 extern char __bp_harden_hyp_vecs_start[], __bp_harden_hyp_vecs_end[];
63 extern atomic_t arm64_el2_vector_last_slot;
64 #endif /* CONFIG_HARDEN_BRANCH_PREDICTOR || CONFIG_HARDEN_EL2_VECTORS */
66 #ifdef CONFIG_HARDEN_BRANCH_PREDICTOR
67 DECLARE_PER_CPU_READ_MOSTLY(struct bp_hardening_data, bp_hardening_data);
69 static inline struct bp_hardening_data *arm64_get_bp_hardening_data(void)
71 return this_cpu_ptr(&bp_hardening_data);
74 static inline void arm64_apply_bp_hardening(void)
76 struct bp_hardening_data *d;
78 if (!cpus_have_const_cap(ARM64_HARDEN_BRANCH_PREDICTOR))
81 d = arm64_get_bp_hardening_data();
86 static inline struct bp_hardening_data *arm64_get_bp_hardening_data(void)
91 static inline void arm64_apply_bp_hardening(void) { }
92 #endif /* CONFIG_HARDEN_BRANCH_PREDICTOR */
94 extern void paging_init(void);
95 extern void bootmem_init(void);
96 extern void __iomem *early_io_map(phys_addr_t phys, unsigned long virt);
97 extern void init_mem_pgprot(void);
98 extern void create_pgd_mapping(struct mm_struct *mm, phys_addr_t phys,
99 unsigned long virt, phys_addr_t size,
100 pgprot_t prot, bool page_mappings_only);
101 extern void *fixmap_remap_fdt(phys_addr_t dt_phys);
102 extern void mark_linear_text_alias_ro(void);
104 #endif /* !__ASSEMBLY__ */