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https://github.com/ApacheThunder/GBA-Exploader.git
synced 2025-06-18 11:35:38 -04:00
4ec14bae55
* Soft Reset for Rumble Menu fixed. New scheme is now used for loading SoftReset.xxxx. Now instead it will look for R4TF.nds (R4TF = 4 character ioType code for DLDI user is currently using with R4TF as an example). If not found it will look for a few specific NDS files to try. If those aren't found it will try boot.nds. If boot.nds isn't found then rumble menu will not be available.
71 lines
1.8 KiB
ArmAsm
71 lines
1.8 KiB
ArmAsm
/*-----------------------------------------------------------------
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Copyright (C) 2005 Michael "Chishm" Chisholm
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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If you use this code, please give due credit and email me about your
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project at chishm@hotmail.com
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------------------------------------------------------------------*/
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.arm
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.global arm7clearRAM
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.type arm7clearRAM STT_FUNC
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arm7clearRAM:
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push {r0-r9}
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// clear exclusive IWRAM
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// 0380:0000 to 0380:FFFF, total 64KiB
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mov r0, #0
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mov r1, #0
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mov r2, #0
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mov r3, #0
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mov r4, #0
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mov r5, #0
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mov r6, #0
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mov r7, #0
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mov r8, #0x03800000
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sub r8, #0x00008000
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mov r9, #0x03800000
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orr r9, r9, #0x10000
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clear_IWRAM_loop:
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stmia r8!, {r0, r1, r2, r3, r4, r5, r6, r7}
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cmp r8, r9
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blt clear_IWRAM_loop
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// clear most of EWRAM - except after RAM end - 0xc000, which has the bootstub
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mov r8, #0x02000000
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ldr r9,=0x4004008
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ldr r9,[r9]
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ands r9,r9,#0x8000
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bne dsi_mode
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mov r9, #0x02400000
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b ds_mode
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dsi_mode:
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mov r9, #0x03000000
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ds_mode:
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sub r9, #0x0000c000
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clear_EWRAM_loop:
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stmia r8!, {r0, r1, r2, r3, r4, r5, r6, r7}
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cmp r8, r9
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blt clear_EWRAM_loop
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pop {r0-r9}
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bx lr
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