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 #include <asm/cpufeature.h> 25 26 typedef struct { 27 atomic64_t id; 28 void *vdso; 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)38static inline bool arm64_kernel_unmapped_at_el0(void) 39 { 40 return IS_ENABLED(CONFIG_UNMAP_KERNEL_AT_EL0) && 41 cpus_have_cap(ARM64_UNMAP_KERNEL_AT_EL0); 42 } 43 44 extern void paging_init(void); 45 extern void __iomem *early_io_map(phys_addr_t phys, unsigned long virt); 46 extern void init_mem_pgprot(void); 47 extern void create_pgd_mapping(struct mm_struct *mm, phys_addr_t phys, 48 unsigned long virt, phys_addr_t size, 49 pgprot_t prot); 50 51 #endif /* !__ASSEMBLY__ */ 52 #endif 53