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_EL1 (0xe11) 22 #define BOOT_CPU_MODE_EL2 (0xe12) 23 24 #ifndef __ASSEMBLY__ 25 26 #include <asm/ptrace.h> 27 28 /* 29 * __boot_cpu_mode records what mode CPUs were booted in. 30 * A correctly-implemented bootloader must start all CPUs in the same mode: 31 * In this case, both 32bit halves of __boot_cpu_mode will contain the 32 * same value (either 0 if booted in EL1, BOOT_CPU_MODE_EL2 if booted in EL2). 33 * 34 * Should the bootloader fail to do this, the two values will be different. 35 * This allows the kernel to flag an error when the secondaries have come up. 36 */ 37 extern u32 __boot_cpu_mode[2]; 38 39 void __hyp_set_vectors(phys_addr_t phys_vector_base); 40 phys_addr_t __hyp_get_vectors(void); 41 42 /* Reports the availability of HYP mode */ 43 static inline bool is_hyp_mode_available(void) 44 { 45 return (__boot_cpu_mode[0] == BOOT_CPU_MODE_EL2 && 46 __boot_cpu_mode[1] == BOOT_CPU_MODE_EL2); 47 } 48 49 /* Check if the bootloader has booted CPUs in different modes */ 50 static inline bool is_hyp_mode_mismatched(void) 51 { 52 return __boot_cpu_mode[0] != __boot_cpu_mode[1]; 53 } 54 55 static inline bool is_kernel_in_hyp_mode(void) 56 { 57 u64 el; 58 59 asm("mrs %0, CurrentEL" : "=r" (el)); 60 return el == CurrentEL_EL2; 61 } 62 63 /* The section containing the hypervisor text */ 64 extern char __hyp_text_start[]; 65 extern char __hyp_text_end[]; 66 67 #endif /* __ASSEMBLY__ */ 68 69 #endif /* ! __ASM__VIRT_H */ 70