55 lines
2.0 KiB
ArmAsm
55 lines
2.0 KiB
ArmAsm
@ This file is part of Luma3DS
|
|
@ Copyright (C) 2016 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.
|
|
|
|
.text
|
|
.arm
|
|
.align 4
|
|
|
|
.global flushCaches
|
|
.type flushCaches, %function
|
|
flushCaches:
|
|
@ Clean and flush data cache
|
|
@ Adpated from http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ddi0155a/ch03s03s05.html ,
|
|
@ and https://github.com/gemarcano/libctr9_io/blob/master/src/ctr_system_ARM.c#L39 as well
|
|
@ Note: ARM's example is actually for a 8KB DCache (which is what the 3DS has)
|
|
@ Implemented in bootROM at address 0xffff0830
|
|
|
|
mov r1, #0 @ segment counter
|
|
outer_loop:
|
|
mov r0, #0 @ line counter
|
|
|
|
inner_loop:
|
|
orr r2, r1, r0 @ generate segment and line address
|
|
mcr p15, 0, r2, c7, c14, 2 @ clean and flush the line
|
|
add r0, #0x20 @ increment to next line
|
|
cmp r0, #0x400
|
|
bne inner_loop
|
|
|
|
add r1, #0x40000000
|
|
cmp r1, #0
|
|
bne outer_loop
|
|
|
|
mcr p15, 0, r1, c7, c10, 4 @ drain write buffer
|
|
|
|
@ Flush instruction cache
|
|
mcr p15, 0, r1, c7, c5, 0
|
|
|
|
bx lr
|