| David Brazdil | 0f672f6 | 2019-12-10 10:32:29 +0000 | [diff] [blame^] | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 2 | /* |
| 3 | * Copyright (C) 2012 ARM Ltd. |
| 4 | * Author: Marc Zyngier <marc.zyngier@arm.com> |
| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 5 | */ |
| 6 | |
| 7 | #ifndef __ASM__VIRT_H |
| 8 | #define __ASM__VIRT_H |
| 9 | |
| 10 | /* |
| 11 | * The arm64 hcall implementation uses x0 to specify the hcall |
| 12 | * number. A value less than HVC_STUB_HCALL_NR indicates a special |
| 13 | * hcall, such as set vector. Any other value is handled in a |
| 14 | * hypervisor specific way. |
| 15 | * |
| 16 | * The hypercall is allowed to clobber any of the caller-saved |
| 17 | * registers (x0-x18), so it is advisable to use it through the |
| 18 | * indirection of a function call (as implemented in hyp-stub.S). |
| 19 | */ |
| 20 | |
| 21 | /* |
| 22 | * HVC_SET_VECTORS - Set the value of the vbar_el2 register. |
| 23 | * |
| 24 | * @x1: Physical address of the new vector table. |
| 25 | */ |
| 26 | #define HVC_SET_VECTORS 0 |
| 27 | |
| 28 | /* |
| 29 | * HVC_SOFT_RESTART - CPU soft reset, used by the cpu_soft_restart routine. |
| 30 | */ |
| 31 | #define HVC_SOFT_RESTART 1 |
| 32 | |
| 33 | /* |
| 34 | * HVC_RESET_VECTORS - Restore the vectors to the original HYP stubs |
| 35 | */ |
| 36 | #define HVC_RESET_VECTORS 2 |
| 37 | |
| 38 | /* Max number of HYP stub hypercalls */ |
| 39 | #define HVC_STUB_HCALL_NR 3 |
| 40 | |
| 41 | /* Error returned when an invalid stub number is passed into x0 */ |
| 42 | #define HVC_STUB_ERR 0xbadca11 |
| 43 | |
| 44 | #define BOOT_CPU_MODE_EL1 (0xe11) |
| 45 | #define BOOT_CPU_MODE_EL2 (0xe12) |
| 46 | |
| 47 | #ifndef __ASSEMBLY__ |
| 48 | |
| 49 | #include <asm/ptrace.h> |
| 50 | #include <asm/sections.h> |
| 51 | #include <asm/sysreg.h> |
| 52 | #include <asm/cpufeature.h> |
| 53 | |
| 54 | /* |
| 55 | * __boot_cpu_mode records what mode CPUs were booted in. |
| 56 | * A correctly-implemented bootloader must start all CPUs in the same mode: |
| 57 | * In this case, both 32bit halves of __boot_cpu_mode will contain the |
| 58 | * same value (either 0 if booted in EL1, BOOT_CPU_MODE_EL2 if booted in EL2). |
| 59 | * |
| 60 | * Should the bootloader fail to do this, the two values will be different. |
| 61 | * This allows the kernel to flag an error when the secondaries have come up. |
| 62 | */ |
| 63 | extern u32 __boot_cpu_mode[2]; |
| 64 | |
| 65 | void __hyp_set_vectors(phys_addr_t phys_vector_base); |
| 66 | void __hyp_reset_vectors(void); |
| 67 | |
| 68 | /* Reports the availability of HYP mode */ |
| 69 | static inline bool is_hyp_mode_available(void) |
| 70 | { |
| 71 | return (__boot_cpu_mode[0] == BOOT_CPU_MODE_EL2 && |
| 72 | __boot_cpu_mode[1] == BOOT_CPU_MODE_EL2); |
| 73 | } |
| 74 | |
| 75 | /* Check if the bootloader has booted CPUs in different modes */ |
| 76 | static inline bool is_hyp_mode_mismatched(void) |
| 77 | { |
| 78 | return __boot_cpu_mode[0] != __boot_cpu_mode[1]; |
| 79 | } |
| 80 | |
| 81 | static inline bool is_kernel_in_hyp_mode(void) |
| 82 | { |
| 83 | return read_sysreg(CurrentEL) == CurrentEL_EL2; |
| 84 | } |
| 85 | |
| 86 | static inline bool has_vhe(void) |
| 87 | { |
| 88 | if (cpus_have_const_cap(ARM64_HAS_VIRT_HOST_EXTN)) |
| 89 | return true; |
| 90 | |
| 91 | return false; |
| 92 | } |
| 93 | |
| 94 | #endif /* __ASSEMBLY__ */ |
| 95 | |
| 96 | #endif /* ! __ASM__VIRT_H */ |