Marc Zyngier | f35a920 | 2012-10-26 15:40:05 +0100 | [diff] [blame] | 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 | |
Geoff Levand | ad72e59 | 2016-04-27 17:47:03 +0100 | [diff] [blame] | 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 | |
Geoff Levand | f9076ec | 2016-06-23 17:54:48 +0000 | [diff] [blame] | 37 | /* |
| 38 | * HVC_SOFT_RESTART - CPU soft reset, used by the cpu_soft_restart routine. |
| 39 | */ |
| 40 | #define HVC_SOFT_RESTART 2 |
| 41 | |
Matthew Leach | 828e983 | 2013-10-11 14:52:16 +0100 | [diff] [blame] | 42 | #define BOOT_CPU_MODE_EL1 (0xe11) |
| 43 | #define BOOT_CPU_MODE_EL2 (0xe12) |
Marc Zyngier | f35a920 | 2012-10-26 15:40:05 +0100 | [diff] [blame] | 44 | |
| 45 | #ifndef __ASSEMBLY__ |
| 46 | |
Marc Zyngier | 82deae0 | 2014-06-09 19:47:09 +0100 | [diff] [blame] | 47 | #include <asm/ptrace.h> |
James Morse | ee78fdc | 2016-08-24 18:27:28 +0100 | [diff] [blame] | 48 | #include <asm/sections.h> |
Mark Rutland | 1f3d869 | 2016-09-08 13:55:37 +0100 | [diff] [blame] | 49 | #include <asm/sysreg.h> |
Marc Zyngier | 82deae0 | 2014-06-09 19:47:09 +0100 | [diff] [blame] | 50 | |
Marc Zyngier | f35a920 | 2012-10-26 15:40:05 +0100 | [diff] [blame] | 51 | /* |
| 52 | * __boot_cpu_mode records what mode CPUs were booted in. |
| 53 | * A correctly-implemented bootloader must start all CPUs in the same mode: |
| 54 | * In this case, both 32bit halves of __boot_cpu_mode will contain the |
| 55 | * same value (either 0 if booted in EL1, BOOT_CPU_MODE_EL2 if booted in EL2). |
| 56 | * |
| 57 | * Should the bootloader fail to do this, the two values will be different. |
| 58 | * This allows the kernel to flag an error when the secondaries have come up. |
| 59 | */ |
| 60 | extern u32 __boot_cpu_mode[2]; |
| 61 | |
Marc Zyngier | 712c6ff | 2012-10-19 17:46:27 +0100 | [diff] [blame] | 62 | void __hyp_set_vectors(phys_addr_t phys_vector_base); |
| 63 | phys_addr_t __hyp_get_vectors(void); |
| 64 | |
Marc Zyngier | f35a920 | 2012-10-26 15:40:05 +0100 | [diff] [blame] | 65 | /* Reports the availability of HYP mode */ |
| 66 | static inline bool is_hyp_mode_available(void) |
| 67 | { |
| 68 | return (__boot_cpu_mode[0] == BOOT_CPU_MODE_EL2 && |
| 69 | __boot_cpu_mode[1] == BOOT_CPU_MODE_EL2); |
| 70 | } |
| 71 | |
| 72 | /* Check if the bootloader has booted CPUs in different modes */ |
| 73 | static inline bool is_hyp_mode_mismatched(void) |
| 74 | { |
Marc Zyngier | f35a920 | 2012-10-26 15:40:05 +0100 | [diff] [blame] | 75 | return __boot_cpu_mode[0] != __boot_cpu_mode[1]; |
| 76 | } |
| 77 | |
Marc Zyngier | 82deae0 | 2014-06-09 19:47:09 +0100 | [diff] [blame] | 78 | static inline bool is_kernel_in_hyp_mode(void) |
| 79 | { |
Mark Rutland | 1f3d869 | 2016-09-08 13:55:37 +0100 | [diff] [blame] | 80 | return read_sysreg(CurrentEL) == CurrentEL_EL2; |
Marc Zyngier | 82deae0 | 2014-06-09 19:47:09 +0100 | [diff] [blame] | 81 | } |
| 82 | |
Suzuki K Poulose | ac1ad20 | 2016-04-13 14:41:33 +0100 | [diff] [blame] | 83 | #ifdef CONFIG_ARM64_VHE |
| 84 | extern void verify_cpu_run_el(void); |
| 85 | #else |
| 86 | static inline void verify_cpu_run_el(void) {} |
| 87 | #endif |
| 88 | |
Marc Zyngier | f35a920 | 2012-10-26 15:40:05 +0100 | [diff] [blame] | 89 | #endif /* __ASSEMBLY__ */ |
| 90 | |
| 91 | #endif /* ! __ASM__VIRT_H */ |