mirror of
https://github.com/ApacheThunder/nitrohaxTWL.git
synced 2025-06-19 03:55:45 -04:00
0872e70084
* Original bootloader doesn't currently support TWL carts so a second one is used in those cases. (still unknown if cheat engine will work for them however) * Main code and bootloader updated to account for DSi/3DS consoles.
106 lines
3.4 KiB
C
106 lines
3.4 KiB
C
/*
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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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#include <string.h>
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#include <nds.h>
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#include "load_bin.h"
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#include "loadtwl_bin.h"
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#include "cheat_engine.h"
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#define LCDC_BANK_C (vu16*)0x06840000
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#define LCDC_BANK_D (vu16*)0x06860000
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#define CHEAT_DATA_LOCATION ((u32*)0x06850000)
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#define CHEAT_DATA_LOCATIONTWL ((u32*)0x06870000)
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#define CHEAT_CODE_END 0xCF000000
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static void vramset (volatile void* dst, u16 val, int len)
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{
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vu32* dst32 = (vu32*)dst;
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u32 val32 = val | (val << 16);
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for ( ; len > 0; len -= 4) {
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*dst32++ = val32;
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}
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}
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static void vramcpy (volatile void* dst, const void* src, int len)
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{
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vu32* dst32 = (vu32*)dst;
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const u32* src32 = (u32*)src;
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for ( ; len > 0; len -= 4) {
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*dst32++ = *src32++;
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}
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}
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void runCheatEngine (void* cheats, int cheatLength, bool isTWLCart)
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{
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irqDisable(IRQ_ALL);
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// The original bootloader fails to boot TWL carts. Using an alternate for those for now.
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// With new bootloader Arm9 SCFG settings occur there instead.
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if (isTWLCart) {
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VRAM_D_CR = VRAM_ENABLE | VRAM_D_LCD;
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vramset (LCDC_BANK_D, 0x0000, 128 * 1024);
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vramcpy (LCDC_BANK_D, loadtwl_bin, loadtwl_bin_size);
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vramcpy (CHEAT_DATA_LOCATIONTWL, cheats, cheatLength);
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CHEAT_DATA_LOCATIONTWL[cheatLength/sizeof(u32)] = CHEAT_CODE_END;
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CHEAT_DATA_LOCATIONTWL[cheatLength/sizeof(u32) + 1] = 0;
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VRAM_D_CR = VRAM_ENABLE | VRAM_D_ARM7_0x06020000;
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REG_EXMEMCNT = 0xffff;
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*(vu32*)0x02FFFFFC = 0;
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*(vu32*)0x02FFFE04 = (u32)0xE59FF018; // ldr pc, 0x02FFFE24
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*(vu32*)0x02FFFE24 = (u32)0x02FFFE04; // Set ARM9 Loop address --> resetARM9(0x02FFFE04);
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resetARM7(0x06020000);
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} else {
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// Direct CPU access to VRAM bank C
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VRAM_C_CR = VRAM_ENABLE | VRAM_C_LCD;
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// Clear VRAM
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vramset (LCDC_BANK_C, 0x0000, 128 * 1024);
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// Load the loader/patcher into the correct address
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vramcpy (LCDC_BANK_C, load_bin, load_bin_size);
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// Put the codes 64KiB after the start of the loader
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vramcpy (CHEAT_DATA_LOCATION, cheats, cheatLength);
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// Mark the end of the code list
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CHEAT_DATA_LOCATION[cheatLength/sizeof(u32)] = CHEAT_CODE_END;
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CHEAT_DATA_LOCATION[cheatLength/sizeof(u32) + 1] = 0;
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// Give the VRAM to the ARM7
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VRAM_C_CR = VRAM_ENABLE | VRAM_C_ARM7_0x06000000;
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// Set MBK and lock SCFG_EXT registers and if not a TWL enhanced cart. (must be locked later in bootloader if TWL cart)
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// Set standard NTR configuration for SCFG and MBK registers. (MBK 1-5 set only on Arm7. Done in bootloader for now)
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if (REG_SCFG_EXT & BIT(31)) {
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REG_MBK6 = 0x00003000;
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REG_MBK7 = 0x00003000;
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REG_MBK8 = 0x00003000;
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REG_SCFG_CLK = 0x80;
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REG_SCFG_EXT = 0x03000000;
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}
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// Reset into a passme loop
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REG_EXMEMCNT = 0xffff;
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*((vu32*)0x027FFFFC) = 0;
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*((vu32*)0x027FFE04) = (u32)0xE59FF018;
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*((vu32*)0x027FFE24) = (u32)0x027FFE04;
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}
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swiSoftReset();
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}
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