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 USER_ASID_FLAG (UL(1) << 48) 20 #define TTBR_ASID_MASK (UL(0xffff) << 48) 21 22 #ifndef __ASSEMBLY__ 23 24 typedef struct { 25 atomic64_t id; 26 void *vdso; 27 } mm_context_t; 28 29 /* 30 * This macro is only used by the TLBI code, which cannot race with an 31 * ASID change and therefore doesn't need to reload the counter using 32 * atomic64_read. 33 */ 34 #define ASID(mm) ((mm)->context.id.counter & 0xffff) 35 arm64_kernel_unmapped_at_el0(void)36static inline bool arm64_kernel_unmapped_at_el0(void) 37 { 38 return IS_ENABLED(CONFIG_UNMAP_KERNEL_AT_EL0) && 39 cpus_have_cap(ARM64_UNMAP_KERNEL_AT_EL0); 40 } 41 42 extern void paging_init(void); 43 extern void __iomem *early_io_map(phys_addr_t phys, unsigned long virt); 44 extern void init_mem_pgprot(void); 45 extern void create_pgd_mapping(struct mm_struct *mm, phys_addr_t phys, 46 unsigned long virt, phys_addr_t size, 47 pgprot_t prot); 48 extern void *fixmap_remap_fdt(phys_addr_t dt_phys); 49 50 #endif /* !__ASSEMBLY__ */ 51 #endif 52