mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
133 lines
3.5 KiB
133 lines
3.5 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
|
/* |
|
* Copyright (C) 2012 ARM Ltd. |
|
* Author: Marc Zyngier <[email protected]> |
|
*/ |
|
|
|
#ifndef __ASM__VIRT_H |
|
#define __ASM__VIRT_H |
|
|
|
/* |
|
* The arm64 hcall implementation uses x0 to specify the hcall |
|
* number. A value less than HVC_STUB_HCALL_NR indicates a special |
|
* hcall, such as set vector. Any other value is handled in a |
|
* hypervisor specific way. |
|
* |
|
* The hypercall is allowed to clobber any of the caller-saved |
|
* registers (x0-x18), so it is advisable to use it through the |
|
* indirection of a function call (as implemented in hyp-stub.S). |
|
*/ |
|
|
|
/* |
|
* HVC_SET_VECTORS - Set the value of the vbar_el2 register. |
|
* |
|
* @x1: Physical address of the new vector table. |
|
*/ |
|
#define HVC_SET_VECTORS 0 |
|
|
|
/* |
|
* HVC_SOFT_RESTART - CPU soft reset, used by the cpu_soft_restart routine. |
|
*/ |
|
#define HVC_SOFT_RESTART 1 |
|
|
|
/* |
|
* HVC_RESET_VECTORS - Restore the vectors to the original HYP stubs |
|
*/ |
|
#define HVC_RESET_VECTORS 2 |
|
|
|
/* |
|
* HVC_VHE_RESTART - Upgrade the CPU from EL1 to EL2, if possible |
|
*/ |
|
#define HVC_VHE_RESTART 3 |
|
|
|
/* Max number of HYP stub hypercalls */ |
|
#define HVC_STUB_HCALL_NR 4 |
|
|
|
/* Error returned when an invalid stub number is passed into x0 */ |
|
#define HVC_STUB_ERR 0xbadca11 |
|
|
|
#define BOOT_CPU_MODE_EL1 (0xe11) |
|
#define BOOT_CPU_MODE_EL2 (0xe12) |
|
|
|
#ifndef __ASSEMBLY__ |
|
|
|
#include <asm/ptrace.h> |
|
#include <asm/sections.h> |
|
#include <asm/sysreg.h> |
|
#include <asm/cpufeature.h> |
|
|
|
/* |
|
* __boot_cpu_mode records what mode CPUs were booted in. |
|
* A correctly-implemented bootloader must start all CPUs in the same mode: |
|
* In this case, both 32bit halves of __boot_cpu_mode will contain the |
|
* same value (either 0 if booted in EL1, BOOT_CPU_MODE_EL2 if booted in EL2). |
|
* |
|
* Should the bootloader fail to do this, the two values will be different. |
|
* This allows the kernel to flag an error when the secondaries have come up. |
|
*/ |
|
extern u32 __boot_cpu_mode[2]; |
|
|
|
void __hyp_set_vectors(phys_addr_t phys_vector_base); |
|
void __hyp_reset_vectors(void); |
|
|
|
DECLARE_STATIC_KEY_FALSE(kvm_protected_mode_initialized); |
|
|
|
/* Reports the availability of HYP mode */ |
|
static inline bool is_hyp_mode_available(void) |
|
{ |
|
/* |
|
* If KVM protected mode is initialized, all CPUs must have been booted |
|
* in EL2. Avoid checking __boot_cpu_mode as CPUs now come up in EL1. |
|
*/ |
|
if (IS_ENABLED(CONFIG_KVM) && |
|
static_branch_likely(&kvm_protected_mode_initialized)) |
|
return true; |
|
|
|
return (__boot_cpu_mode[0] == BOOT_CPU_MODE_EL2 && |
|
__boot_cpu_mode[1] == BOOT_CPU_MODE_EL2); |
|
} |
|
|
|
/* Check if the bootloader has booted CPUs in different modes */ |
|
static inline bool is_hyp_mode_mismatched(void) |
|
{ |
|
/* |
|
* If KVM protected mode is initialized, all CPUs must have been booted |
|
* in EL2. Avoid checking __boot_cpu_mode as CPUs now come up in EL1. |
|
*/ |
|
if (IS_ENABLED(CONFIG_KVM) && |
|
static_branch_likely(&kvm_protected_mode_initialized)) |
|
return false; |
|
|
|
return __boot_cpu_mode[0] != __boot_cpu_mode[1]; |
|
} |
|
|
|
static inline bool is_kernel_in_hyp_mode(void) |
|
{ |
|
return read_sysreg(CurrentEL) == CurrentEL_EL2; |
|
} |
|
|
|
static __always_inline bool has_vhe(void) |
|
{ |
|
/* |
|
* Code only run in VHE/NVHE hyp context can assume VHE is present or |
|
* absent. Otherwise fall back to caps. |
|
*/ |
|
if (is_vhe_hyp_code()) |
|
return true; |
|
else if (is_nvhe_hyp_code()) |
|
return false; |
|
else |
|
return cpus_have_final_cap(ARM64_HAS_VIRT_HOST_EXTN); |
|
} |
|
|
|
static __always_inline bool is_protected_kvm_enabled(void) |
|
{ |
|
if (is_vhe_hyp_code()) |
|
return false; |
|
else |
|
return cpus_have_final_cap(ARM64_KVM_PROTECTED_MODE); |
|
} |
|
|
|
#endif /* __ASSEMBLY__ */ |
|
|
|
#endif /* ! __ASM__VIRT_H */
|
|
|