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Luma3DS-3GX/loader/source/fatfs/sdmmc/delay.s

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// Copyright 2014 Normmatt
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
.arm
.global ioDelay
.type ioDelay STT_FUNC
@ioDelay ( u32 us )
ioDelay:
ldr r1, =0x18000000 @ VRAM
1:
@ Loop doing uncached reads from VRAM to make loop timing more reliable
ldr r2, [r1]
subs r0, #1
bgt 1b
bx lr