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 USER_ASID_FLAG (UL(1) << 48)
23 #include <linux/percpu.h>
31 * This macro is only used by the TLBI code, which cannot race with an
32 * ASID change and therefore doesn't need to reload the counter using
35 #define ASID(mm) ((mm)->context.id.counter & 0xffff)
37 static __always_inline bool arm64_kernel_unmapped_at_el0(void)
39 return IS_ENABLED(CONFIG_UNMAP_KERNEL_AT_EL0) &&
40 cpus_have_const_cap(ARM64_UNMAP_KERNEL_AT_EL0);
43 typedef void (*bp_hardening_cb_t)(void);
45 struct bp_hardening_data {
50 * template_start is only used by the BHB mitigation to identify the
51 * hyp_vectors_slot sequence.
53 const char *template_start;
56 #ifdef CONFIG_HARDEN_BRANCH_PREDICTOR
57 extern char __bp_harden_hyp_vecs_start[], __bp_harden_hyp_vecs_end[];
59 DECLARE_PER_CPU_READ_MOSTLY(struct bp_hardening_data, bp_hardening_data);
61 static inline struct bp_hardening_data *arm64_get_bp_hardening_data(void)
63 return this_cpu_ptr(&bp_hardening_data);
66 static inline void arm64_apply_bp_hardening(void)
68 struct bp_hardening_data *d;
70 if (!cpus_have_cap(ARM64_HARDEN_BRANCH_PREDICTOR))
73 d = arm64_get_bp_hardening_data();
78 static inline struct bp_hardening_data *arm64_get_bp_hardening_data(void)
83 static inline void arm64_apply_bp_hardening(void) { }
84 #endif /* CONFIG_HARDEN_BRANCH_PREDICTOR */
86 extern void paging_init(void);
87 extern void bootmem_init(void);
88 extern void __iomem *early_io_map(phys_addr_t phys, unsigned long virt);
89 extern void init_mem_pgprot(void);
90 extern void create_pgd_mapping(struct mm_struct *mm, phys_addr_t phys,
91 unsigned long virt, phys_addr_t size,
92 pgprot_t prot, bool allow_block_mappings);
93 extern void *fixmap_remap_fdt(phys_addr_t dt_phys, int *size, pgprot_t prot);
95 #endif /* !__ASSEMBLY__ */