Initial commit

arm9/source/main.cpp

@@ -0,0 +1,55 @@
+#include "common.h"
+#include <libtwl/card/card.h>
+#include <libtwl/mem/memExtern.h>
+#include <libtwl/rtos/rtosIrq.h>
+#include <libtwl/rtos/rtosThread.h>
+#include <libtwl/ipc/ipcSync.h>
+#include <libtwl/ipc/ipcFifoSystem.h>
+#include "core/Environment.h"
+#include "picoLoaderBootstrap.h"
+
+#define NTR_CMD_ID_GAME_DISABLE_SCRAMBLING      0xFC00000000000000ull
+
+/// @brief Switches the DSpico into unscrambled game mode and disables scrambling.
+static void disableScrambling()
+{
+    // Map slot 1 to arm9
+    mem_setDsCartridgeCpu(EXMEMCNT_SLOT1_CPU_ARM9);
+
+    // Switch the DSpico into unscrambled game mode
+    card_romSetCmd(NTR_CMD_ID_GAME_DISABLE_SCRAMBLING);
+    card_romStartXfer(MCCNT1_DIR_READ | MCCNT1_RESET_OFF | MCCNT1_CLK_6_7_MHZ | MCCNT1_LEN_0 | MCCNT1_CMD_SCRAMBLE |
+        MCCNT1_LATENCY2(0) | MCCNT1_CLOCK_SCRAMBLER | MCCNT1_LATENCY1(24), false);
+    card_romWaitBusy();
+
+    // Set the seed of the scrambler to zero. As a result, it will only ever produce zero's.
+    // This means that even if a command is send with scrambling enabled, it will have no effect.
+    REG_MCCNT1 = 0;
+    REG_MCSCR0 = 0;
+    REG_MCSCR1 = 0;
+    REG_MCSCR2 = 0;
+    REG_MCCNT1 = MCCNT1_RESET_OFF | MCCNT1_APPLY_SCRAMBLE_SEED | MCCNT1_CLOCK_SCRAMBLER | MCCNT1_READ_DATA_DESCRAMBLE;
+}
+
+int main(int argc, char* argv[])
+{
+    Environment::Initialize();
+    mem_setDsCartridgeCpu(EXMEMCNT_SLOT1_CPU_ARM9);
+
+    rtos_initIrq();
+    rtos_startMainThread();
+    ipc_initFifoSystem();
+
+    while (ipc_getArm7SyncBits() != 7);
+
+    disableScrambling();
+
+    // Boot _picoboot.nds from the DSpico SD card.
+    pload_setBootDrive(PLOAD_BOOT_DRIVE_DLDI);
+    auto loadParams = pload_getLoadParams();
+    strlcat(loadParams->romPath, "fat:/_picoboot.nds", sizeof(loadParams->romPath));
+    loadParams->savePath[0] = 0;
+    pload_start();
+
+    while(1);
+}