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 /* 22 * The arm64 hcall implementation uses x0 to specify the hcall type. A value 23 * less than 0xfff indicates a special hcall, such as get/set vector. 24 * Any other value is used as a pointer to the function to call. 25 */ 26 27 /* HVC_GET_VECTORS - Return the value of the vbar_el2 register. */ 28 #define HVC_GET_VECTORS 0 29 30 /* 31 * HVC_SET_VECTORS - Set the value of the vbar_el2 register. 32 * 33 * @x1: Physical address of the new vector table. 34 */ 35 #define HVC_SET_VECTORS 1 36 37 /* 38 * HVC_SOFT_RESTART - CPU soft reset, used by the cpu_soft_restart routine. 39 */ 40 #define HVC_SOFT_RESTART 2 41 42 #define BOOT_CPU_MODE_EL1 (0xe11) 43 #define BOOT_CPU_MODE_EL2 (0xe12) 44 45 #ifndef __ASSEMBLY__ 46 47 #include <asm/ptrace.h> 48 #include <asm/sections.h> 49 #include <asm/sysreg.h> 50 #include <asm/cpufeature.h> 51 52 /* 53 * __boot_cpu_mode records what mode CPUs were booted in. 54 * A correctly-implemented bootloader must start all CPUs in the same mode: 55 * In this case, both 32bit halves of __boot_cpu_mode will contain the 56 * same value (either 0 if booted in EL1, BOOT_CPU_MODE_EL2 if booted in EL2). 57 * 58 * Should the bootloader fail to do this, the two values will be different. 59 * This allows the kernel to flag an error when the secondaries have come up. 60 */ 61 extern u32 __boot_cpu_mode[2]; 62 63 void __hyp_set_vectors(phys_addr_t phys_vector_base); 64 phys_addr_t __hyp_get_vectors(void); 65 66 /* Reports the availability of HYP mode */ 67 static inline bool is_hyp_mode_available(void) 68 { 69 return (__boot_cpu_mode[0] == BOOT_CPU_MODE_EL2 && 70 __boot_cpu_mode[1] == BOOT_CPU_MODE_EL2); 71 } 72 73 /* Check if the bootloader has booted CPUs in different modes */ 74 static inline bool is_hyp_mode_mismatched(void) 75 { 76 return __boot_cpu_mode[0] != __boot_cpu_mode[1]; 77 } 78 79 static inline bool is_kernel_in_hyp_mode(void) 80 { 81 return read_sysreg(CurrentEL) == CurrentEL_EL2; 82 } 83 84 static inline bool has_vhe(void) 85 { 86 if (cpus_have_const_cap(ARM64_HAS_VIRT_HOST_EXTN)) 87 return true; 88 89 return false; 90 } 91 92 #ifdef CONFIG_ARM64_VHE 93 extern void verify_cpu_run_el(void); 94 #else 95 static inline void verify_cpu_run_el(void) {} 96 #endif 97 98 #endif /* __ASSEMBLY__ */ 99 100 #endif /* ! __ASM__VIRT_H */ 101