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/*
* Copyright (c) 2021, Nico Weber <thakis@chromium.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
// In a specially-named text section so that the linker script can put it first in .text.
.section ".text.first"
.global start
.type start, @function
start:
// Let only core 0 continue, put other cores to sleep.
mrs x13, MPIDR_EL1
and x13, x13, 0xff
cbnz x13, halt
// Let stack start before .text for now.
// 512 kiB (0x80000) of stack are probably not sufficient, especially once we give the other cores some stack too,
// but for now it's ok.
msr SPSel, #0 //Use the same SP as we descend into EL1
adrp x14, start
add x14, x14, :lo12:start
mov sp, x14
// Clear BSS.
adrp x14, start_of_bss
add x14, x14, :lo12:start_of_bss
ldr x15, =size_of_bss_divided_by_8
Lbss_clear_loop:
str xzr, [x14], #8
subs x15, x15, #1
bne Lbss_clear_loop
b init
halt:
msr daifset, #2
wfi
b halt
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