diff options
Diffstat (limited to 'Kernel/Prekernel/Arch/aarch64/Aarch64_asm_utils.S')
| -rw-r--r-- | Kernel/Prekernel/Arch/aarch64/Aarch64_asm_utils.S | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/Kernel/Prekernel/Arch/aarch64/Aarch64_asm_utils.S b/Kernel/Prekernel/Arch/aarch64/Aarch64_asm_utils.S index 334848f9e7..b5eba4784d 100644 --- a/Kernel/Prekernel/Arch/aarch64/Aarch64_asm_utils.S +++ b/Kernel/Prekernel/Arch/aarch64/Aarch64_asm_utils.S @@ -1,12 +1,24 @@ /* + * Copyright (c) 2021, Nico Weber <thakis@chromium.org> * Copyright (c) 2021, Marcin Undak <mcinek@gmail.com> * * SPDX-License-Identifier: BSD-2-Clause */ .global get_current_exception_level +.type get_current_exception_level, @function get_current_exception_level: mrs x0, CurrentEL lsr x0, x0, #2 and x0, x0, #0x3 ret + +.global wait_cycles +.type wait_cycles, @function +wait_cycles: +Lstart: + // This is probably too fast when caching and branch prediction is turned on. + // FIXME: Make timer-based. + subs x0, x0, #1 + bne Lstart + ret |