1 /* 2 * Copyright (C) 2012 ARM Ltd. 3 * Author: Marc Zyngier <marc.zyngier@arm.com> 4 * 5 * This program is free software: you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License version 2 as 7 * published by the Free Software Foundation. 8 * 9 * This program is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * GNU General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public License 15 * along with this program. If not, see <http://www.gnu.org/licenses/>. 16 */ 17 18 #ifndef __ASM__VIRT_H 19 #define __ASM__VIRT_H 20 21 #define BOOT_CPU_MODE_EL2 (0x0e12b007) 22 23 #ifndef __ASSEMBLY__ 24 #include <asm/cacheflush.h> 25 26 /* 27 * __boot_cpu_mode records what mode CPUs were booted in. 28 * A correctly-implemented bootloader must start all CPUs in the same mode: 29 * In this case, both 32bit halves of __boot_cpu_mode will contain the 30 * same value (either 0 if booted in EL1, BOOT_CPU_MODE_EL2 if booted in EL2). 31 * 32 * Should the bootloader fail to do this, the two values will be different. 33 * This allows the kernel to flag an error when the secondaries have come up. 34 */ 35 extern u32 __boot_cpu_mode[2]; 36 37 void __hyp_set_vectors(phys_addr_t phys_vector_base); 38 phys_addr_t __hyp_get_vectors(void); 39 40 static inline void sync_boot_mode(void) 41 { 42 /* 43 * As secondaries write to __boot_cpu_mode with caches disabled, we 44 * must flush the corresponding cache entries to ensure the visibility 45 * of their writes. 46 */ 47 __flush_dcache_area(__boot_cpu_mode, sizeof(__boot_cpu_mode)); 48 } 49 50 /* Reports the availability of HYP mode */ 51 static inline bool is_hyp_mode_available(void) 52 { 53 sync_boot_mode(); 54 return (__boot_cpu_mode[0] == BOOT_CPU_MODE_EL2 && 55 __boot_cpu_mode[1] == BOOT_CPU_MODE_EL2); 56 } 57 58 /* Check if the bootloader has booted CPUs in different modes */ 59 static inline bool is_hyp_mode_mismatched(void) 60 { 61 sync_boot_mode(); 62 return __boot_cpu_mode[0] != __boot_cpu_mode[1]; 63 } 64 65 #endif /* __ASSEMBLY__ */ 66 67 #endif /* ! __ASM__VIRT_H */ 68