Luma3DS-3GX/arm11/source/start.s

@   This file is part of Luma3DS
@   Copyright (C) 2017 Aurora Wright, TuxSH
@
@   This program is free software: you can redistribute it and/or modify
@   it under the terms of the GNU General Public License as published by
@   the Free Software Foundation, either version 3 of the License, or
@   (at your option) any later version.
@
@   This program is distributed in the hope that it will be useful,
@   but WITHOUT ANY WARRANTY; without even the implied warranty of
@   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
@   GNU General Public License for more details.
@
@   You should have received a copy of the GNU General Public License
@   along with this program.  If not, see <http://www.gnu.org/licenses/>.
@
@   Additional Terms 7.b of GPLv3 applies to this file: Requiring preservation of specified
@   reasonable legal notices or author attributions in that material or in the Appropriate Legal
@   Notices displayed by works containing it.
 
.section .text.start
.align 4
.global _start
.type   _start, %function
_start:
b start

.global operation
operation:
    .word 0

start:
    @ Disable interrupts and switch to supervisor mode
    cpsid aif, #0x13

    @ Set the control register to reset default: everything disabled
    ldr r0, =0x54078
    mcr p15, 0, r0, c1, c0, 0

    @ Set the auxiliary control register to reset default.
    @ Enables instruction folding, static branch prediction,
    @ dynamic branch prediction, and return stack.
    mov r0, #0xF
    mcr p15, 0, r0, c1, c0, 1

    @ Invalidate both caches, flush the prefetch buffer then DSB
    mov r0, #0
    mcr p15, 0, r0, c7, c5, 4
    mcr p15, 0, r0, c7, c7, 0
    mcr p15, 0, r0, c7, c10, 4

    @ Clear BSS
    ldr r0, =__bss_start
    mov r1, #0
    ldr r2, =__bss_end
    sub r2, r0
    bl memset32

    ldr sp, =__stack_top__
    b main

.global prepareForFirmlaunch
.type   prepareForFirmlaunch, %function
prepareForFirmlaunch:
    str r0, [r1]            @ tell ARM9 we're done
    mov r0, #0x20000000

    _wait_for_core0_entrypoint_loop:
        ldr r1, [r0, #-4]   @ check if core0's entrypoint is 0
        cmp r1, #0
        beq _wait_for_core0_entrypoint_loop

    bx r1                   @ jump to core0's entrypoint
prepareForFirmlaunchEnd:

.global prepareForFirmlaunchSize
prepareForFirmlaunchSize: .word prepareForFirmlaunchEnd - prepareForFirmlaunch