mirror of
https://github.com/coderkei/akmenu-next.git
synced 2025-06-19 01:15:32 -04:00
fc0e950f34
This is loosely based on WAIO: - Load akloader from a prebuilt akloader.nds. Must be extracted from a given kernel. - Remaining code based on the R4 variant of romloader.cpp - Add setting to alternate between nds-bootstrap and given kernel
95 lines
2.8 KiB
C++
95 lines
2.8 KiB
C++
/*
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AcekardLauncher.cpp
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Copyright (C) 2007 Acekard, www.acekard.com
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Copyright (C) 2007-2009 somebody
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Copyright (C) 2009 yellow wood goblin
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Copyright (C) 2024 lifehackerhansol
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SPDX-License-Identifier: GPL-3.0-or-later
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*/
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#include <climits>
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#include <cstring>
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#include <string>
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#include <nds.h>
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#include "../../../share/fifotool.h"
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#include "AcekardLauncher.h"
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#include "dbgtool.h"
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// 256 UCS-2 characters encoded into UTF-8 can use up to 768 UTF-8 chars
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#define MAX_FILENAME_LENGTH 768
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// FIFO_CHANNEL_BITS - number of bits used to specify the channel in a packet - default=4
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#define FIFO_CHANNEL_BITS 4
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#define FIFO_CHANNEL_SHIFT (32 - FIFO_CHANNEL_BITS)
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#define FIFO_IMMEDIATEBIT_SHIFT (FIFO_CHANNEL_SHIFT - 2)
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#define FIFO_IMMEDIATEBIT (1 << FIFO_IMMEDIATEBIT_SHIFT)
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#define FIFO_EXTRABIT_SHIFT (FIFO_CHANNEL_SHIFT - 3)
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#define FIFO_EXTRABIT (1 << FIFO_EXTRABIT_SHIFT)
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#define FIFO_VALUE32_MASK (FIFO_EXTRABIT - 1)
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#define FIFO_PACK_VALUE32(channel, value32) \
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(((channel) << FIFO_CHANNEL_SHIFT) | FIFO_IMMEDIATEBIT | (((value32)) & FIFO_VALUE32_MASK))
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static void resetAndLoop() {
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// Interrupt
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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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DC_FlushAll();
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DC_InvalidateAll();
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fifoSendValue32(FIFO_USER_01, MENU_MSG_ARM7_REBOOT);
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while (true) {
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while (REG_IPC_FIFO_CR & IPC_FIFO_RECV_EMPTY)
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;
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u32 res = REG_IPC_FIFO_RX;
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if (FIFO_PACK_VALUE32(FIFO_USER_01, MENU_MSG_ARM7_READY_BOOT) == res) break;
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}
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swiSoftReset();
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}
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bool AcekardLauncher::launchRom(std::string romPath, std::string savePath, u32 flags,
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u32 cheatOffset, u32 cheatSize) {
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tNDSHeader header;
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dbg_printf("load %s\n", romPath.c_str());
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// akloaders are very old and expect the old-style libfat mount points
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romPath.replace(0, 3, "fat0");
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savePath.replace(0, 3, "fat0");
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FILE* loader = fopen("fat:/__rpg/akloader.nds", "rb");
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if (loader == NULL) return false;
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fseek(loader, 0, SEEK_SET);
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fread(&header, sizeof(header), 1, loader);
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// copy loader's arm7 code
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fseek(loader, header.arm7romOffset, SEEK_SET);
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fread(header.arm7destination, 4, header.arm7binarySize >> 2, loader);
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__NDSHeader->arm7executeAddress = header.arm7executeAddress;
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// copy loader's arm9 code
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fseek(loader, header.arm9romOffset, SEEK_SET);
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fread(header.arm9destination, 4, header.arm9binarySize >> 2, loader);
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__NDSHeader->arm9executeAddress = header.arm9executeAddress;
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fclose(loader);
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*(u32*)0x23fd900 = flags;
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*(u32*)0x23fd904 = cheatOffset;
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*(u32*)0x23fd908 = cheatSize;
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memset((void*)0x23fda00, 0, MAX_FILENAME_LENGTH * 2);
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strcpy((char*)0x23fda00, romPath.c_str());
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strcpy((char*)(0x23fda00 + MAX_FILENAME_LENGTH), savePath.c_str());
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dbg_printf("load done\n");
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resetAndLoop();
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return true;
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}
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