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 23 * number. A value less than HVC_STUB_HCALL_NR indicates a special 24 * hcall, such as set vector. Any other value is handled in a 25 * hypervisor specific way. 26 * 27 * The hypercall is allowed to clobber any of the caller-saved 28 * registers (x0-x18), so it is advisable to use it through the 29 * indirection of a function call (as implemented in hyp-stub.S). 30 */ 31 32 /* 33 * HVC_SET_VECTORS - Set the value of the vbar_el2 register. 34 * 35 * @x1: Physical address of the new vector table. 36 */ 37 #define HVC_SET_VECTORS 0 38 39 /* 40 * HVC_SOFT_RESTART - CPU soft reset, used by the cpu_soft_restart routine. 41 */ 42 #define HVC_SOFT_RESTART 1 43 44 /* 45 * HVC_RESET_VECTORS - Restore the vectors to the original HYP stubs 46 */ 47 #define HVC_RESET_VECTORS 2 48 49 /* Max number of HYP stub hypercalls */ 50 #define HVC_STUB_HCALL_NR 3 51 52 /* Error returned when an invalid stub number is passed into x0 */ 53 #define HVC_STUB_ERR 0xbadca11 54 55 #define BOOT_CPU_MODE_EL1 (0xe11) 56 #define BOOT_CPU_MODE_EL2 (0xe12) 57 58 #ifndef __ASSEMBLY__ 59 60 #include <asm/ptrace.h> 61 #include <asm/sections.h> 62 #include <asm/sysreg.h> 63 #include <asm/cpufeature.h> 64 65 /* 66 * __boot_cpu_mode records what mode CPUs were booted in. 67 * A correctly-implemented bootloader must start all CPUs in the same mode: 68 * In this case, both 32bit halves of __boot_cpu_mode will contain the 69 * same value (either 0 if booted in EL1, BOOT_CPU_MODE_EL2 if booted in EL2). 70 * 71 * Should the bootloader fail to do this, the two values will be different. 72 * This allows the kernel to flag an error when the secondaries have come up. 73 */ 74 extern u32 __boot_cpu_mode[2]; 75 76 void __hyp_set_vectors(phys_addr_t phys_vector_base); 77 void __hyp_reset_vectors(void); 78 79 /* Reports the availability of HYP mode */ 80 static inline bool is_hyp_mode_available(void) 81 { 82 return (__boot_cpu_mode[0] == BOOT_CPU_MODE_EL2 && 83 __boot_cpu_mode[1] == BOOT_CPU_MODE_EL2); 84 } 85 86 /* Check if the bootloader has booted CPUs in different modes */ 87 static inline bool is_hyp_mode_mismatched(void) 88 { 89 return __boot_cpu_mode[0] != __boot_cpu_mode[1]; 90 } 91 92 static inline bool is_kernel_in_hyp_mode(void) 93 { 94 return read_sysreg(CurrentEL) == CurrentEL_EL2; 95 } 96 97 static inline bool has_vhe(void) 98 { 99 if (cpus_have_const_cap(ARM64_HAS_VIRT_HOST_EXTN)) 100 return true; 101 102 return false; 103 } 104 105 #endif /* __ASSEMBLY__ */ 106 107 #endif /* ! __ASM__VIRT_H */ 108