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Kernel: Move Prekernel assembly utils to aarch64/ASM_wrapper.h

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By moving these functions to the ASM_wrapper.h file, we can get rid of
another Prekernel file.
This commit is contained in:
Timon Kruiper 2022-05-09 23:09:44 +02:00 • committed by Linus Groh
parent e80d8d697c
commit e7c5fd978b
8 changed files with 44 additions and 77 deletions
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37
Kernel/Arch/aarch64/ASM_wrapper.h
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@ -1,5 +1,8 @@
/*
* Copyright (c) 2021, James Mintram <me@jamesrm.com>
* Copyright (c) 2021, Nico Weber <thakis@chromium.org>
* Copyright (c) 2021, Marcin Undak <mcinek@gmail.com>
* Copyright (c) 2021, Jesse Buhagiar <jooster669@gmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
@ -51,4 +54,38 @@ inline ExceptionLevel get_current_exception_level()
return static_cast<ExceptionLevel>(current_exception_level);
}
inline void wait_cycles(int n)
{
// This is probably too fast when caching and branch prediction is turned on.
// FIXME: Make timer-based.
asm("mov x0, %[value]\n"
"0:\n"
" subs x0, x0, #1\n"
" bne 0b" ::[value] "r"(n)
: "x0");
}
inline void el1_vector_table_install(void* vector_table)
{
asm("msr VBAR_EL1, %[value]" ::[value] "r"(vector_table));
}
inline void enter_el2_from_el3()
{
asm volatile(" adr x0, entered_el2\n"
" msr elr_el3, x0\n"
" eret\n"
"entered_el2:" ::
: "x0");
}
inline void enter_el1_from_el2()
{
asm volatile(" adr x0, entered_el1\n"
" msr elr_el2, x0\n"
" eret\n"
"entered_el1:" ::
: "x0");
}
}