mirror of
https://github.com/coderkei/akmenu-next.git
synced 2025-06-19 17:35:38 -04:00
21b6b529f3
Not entirely sure why, but FIFOs were being sent and received AFTER the interrupts were cleared, causing them to not send. It's unknown how this ever worked on older libnds/devkitARM, but FIFOs need interrupts to work. This workaround, instead, hijacks an area of the ROM header as a temporary variable to wait for ARM7.
81 lines
2.1 KiB
C++
81 lines
2.1 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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static void resetAndLoop() {
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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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*((vu32*)0x02FFFE04) = 0;
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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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// wait for arm7
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while (*((vu32*)0x02FFFE04) == 0)
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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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