mirror of
https://github.com/ApacheThunder/XuluMenu.git
synced 2025-06-19 03:55:32 -04:00
2550af0c99
* Can now boot stage2 (in safe block mode) if holding L-Shoulder + R-Shoulder + A + B + DPAD Up on boot. This allows using built in stage2 usb update mode for "bootleg" style N-Cards that have Xulumenu installed. * This button combo will not do anything for regular N-Card users as they already have a proper stage2 section on nand and it will always end up booting to USB update mode with this button combo before xulumenu can boot.
96 lines
2.9 KiB
C
96 lines
2.9 KiB
C
/*
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main.arm9.c
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By Michael Chisholm (Chishm)
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All resetMemory and startBinary functions are based
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on the MultiNDS loader by Darkain.
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Original source available at:
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http://cvs.sourceforge.net/viewcvs.py/ndslib/ndslib/examples/loader/boot/main.cpp
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License:
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NitroHax -- Cheat tool for the Nintendo DS
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Copyright (C) 2008 Michael "Chishm" Chisholm
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(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, see <http://www.gnu.org/licenses/>.
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*/
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#define ARM9
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#undef ARM7
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#include <nds/memory.h>
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#include <nds/arm9/video.h>
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#include <nds/arm9/input.h>
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#include <nds/interrupts.h>
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#include <nds/dma.h>
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#include <nds/timers.h>
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#include <nds/system.h>
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#include <nds/ipc.h>
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#include "common.h"
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volatile u32 arm9_BLANK_RAM = 0;
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/*-------------------------------------------------------------------------
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External functions
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--------------------------------------------------------------------------*/
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extern void arm9_clearCache (void);
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extern void arm9_reset (void);
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/*-------------------------------------------------------------------------
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arm9_main
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Clears the ARM9's icahce and dcache
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Clears the ARM9's DMA channels and resets video memory
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Jumps to the ARM9 NDS binary in sync with the ARM7
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Written by Darkain, modified by Chishm
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--------------------------------------------------------------------------*/
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void arm9_main (void) {
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register int i;
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//set shared ram to ARM7
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WRAM_CR = 0x03;
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REG_EXMEMCNT = 0xE880;
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// Disable interrupts
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REG_IME = 0;
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REG_IE = 0;
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REG_IF = ~0;
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// Synchronise start
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ipcSendState(ARM9_START);
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while (ipcRecvState() != ARM7_START);
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ipcSendState(ARM9_MEMCLR);
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arm9_clearCache();
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for (i=0; i<16*1024; i+=4) { //first 16KB
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(*(vu32*)(i+0x00000000)) = 0x00000000; //clear ITCM
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(*(vu32*)(i+0x00800000)) = 0x00000000; //clear DTCM
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}
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for (i=16*1024; i<32*1024; i+=4) { //second 16KB
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(*(vu32*)(i+0x00000000)) = 0x00000000; //clear ITCM
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}
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(*(vu32*)0x00803FFC) = 0; //IRQ_HANDLER ARM9 version
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(*(vu32*)0x00803FF8) = ~0; //VBLANK_INTR_WAIT_FLAGS ARM9 version
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// Clear out FIFO
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REG_IPC_FIFO_CR = IPC_FIFO_ENABLE | IPC_FIFO_SEND_CLEAR;
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REG_IPC_FIFO_CR = 0;
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// Clear out ARM9 DMA channels
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for (i=0; i<4; i++) {
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DMA_CR(i) = 0;
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DMA_SRC(i) = 0;
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DMA_DEST(i) = 0;
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TIMER_CR(i) = 0;
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TIMER_DATA(i) = 0;
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}
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// set ARM9 state to ready and wait for instructions from ARM7
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ipcSendState(ARM9_READY);
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while (ipcRecvState() != ARM7_BOOTBIN);
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arm9_reset();
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}
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