Initial commit

2026-06-02 09:06:57 +02:00 · 2025-11-09 16:07:01 +01:00
commit 29671d041f
39 changed files with 26346 additions and 0 deletions
--- a/arm9/source/picoLoaderBootstrap.cpp
+++ b/arm9/source/picoLoaderBootstrap.cpp
@@ -0,0 +1,127 @@
+#include "common.h"
+#include <stdlib.h>
+#include <string.h>
+#include <nds/arm9/cache.h>
+#include <libtwl/gfx/gfx.h>
+#include <libtwl/rtos/rtosIrq.h>
+#include <libtwl/mem/memVram.h>
+#include <libtwl/dma/dmaNitro.h>
+#include <libtwl/dma/dmaTwl.h>
+#include <libtwl/ipc/ipcFifoSystem.h>
+#include <libtwl/mem/memExtern.h>
+#include "core/Environment.h"
+#include "ipcChannels.h"
+#include "errorDisplay/ErrorDisplay.h"
+#include "fat/dldi.h"
+#include "fat/ff.h"
+#include "picoLoaderBootstrap.h"
+
+#define PICO_LOADER_9_PATH    "/_pico/picoLoader9.bin"
+#define PICO_LOADER_7_PATH    "/_pico/picoLoader7.bin"
+
+#define PICOLOADER_BUFFER_SIZE (128 * 1024) // 128KB
+
+typedef void (*pico_loader_9_func_t)(void);
+
+static pload_params_t sLoadParams;
+static PicoLoaderBootDrive sBootDrive;
+
+static FATFS sFatFs;
+static FIL sFile;
+
+static uint8_t picoLoader9[PICOLOADER_BUFFER_SIZE];
+static uint8_t picoLoader7[PICOLOADER_BUFFER_SIZE];
+
+static void showErrorScreen(const char* text)
+{
+    // Enable DS display only on errors
+    REG_DISPCNT = 0x10000;
+    REG_DISPCNT_SUB = 0x10000;
+    ErrorDisplay().PrintError(text);
+    while (true);
+}
+
+static u32 loadFile(const char* path, void* destination)
+{
+    if (f_open(&sFile, path, FA_OPEN_EXISTING | FA_READ) != FR_OK)
+    {
+        showErrorScreen("ERROR: Failed to open Pico Loader file.");
+    }
+
+    u32 size = f_size(&sFile);
+
+    UINT bytesRead;
+    if (f_read(&sFile, destination, size, &bytesRead) != FR_OK)
+    {
+        showErrorScreen("ERROR: Failed to read Pico Loader file.");
+    }
+
+    f_close(&sFile);
+
+    return size;
+}
+
+pload_params_t* pload_getLoadParams()
+{
+    return &sLoadParams;
+}
+
+void pload_setBootDrive(PicoLoaderBootDrive bootDrive)
+{
+    sBootDrive = bootDrive;
+}
+
+void pload_start()
+{
+    rtos_disableIrqs();
+    REG_IME = 0;
+
+    REG_DISPCNT = 0;
+    REG_DISPCNT_SUB = 0;
+
+    dma_ntrStopSafe(0);
+    dma_ntrStopSafe(1);
+    dma_ntrStopSafe(2);
+    dma_ntrStopSafe(3);
+
+    if (Environment::IsDsiMode())
+    {
+        REG_NDMA0CNT = 0;
+        REG_NDMA1CNT = 0;
+        REG_NDMA2CNT = 0;
+        REG_NDMA3CNT = 0;
+    }
+
+    // Mount the SD card
+    if (f_mount(&sFatFs, "fat:", 1) != FR_OK)
+    {
+        showErrorScreen("Error: Failed to mount SD card.");
+    }
+
+    // Load Pico Loader from the SD card
+    mem_setVramAMapping(MEM_VRAM_AB_LCDC);
+    mem_setVramCMapping(MEM_VRAM_C_LCDC);
+    mem_setVramDMapping(MEM_VRAM_D_LCDC);
+
+    u32 picoLoader9size = loadFile(PICO_LOADER_9_PATH, (void*)picoLoader9);
+    u32 picoLoader7size = loadFile(PICO_LOADER_7_PATH, (void*)picoLoader7);
+
+    DC_FlushAll();
+    DC_InvalidateAll();
+    IC_InvalidateAll();
+
+    dma_ntrCopy16(3, picoLoader9, (void*)0x06800000, picoLoader9size);
+    dma_ntrCopy16(3, picoLoader7, (void*)0x06840000, picoLoader7size);
+
+    // Setup the Pico Loader header
+    ((pload_header7_t*)0x06840000)->bootDrive = sBootDrive;
+    dma_ntrCopy16(3, &sLoadParams, &((pload_header7_t*)0x06840000)->loadParams, sizeof(pload_params_t));
+    ((pload_header7_t*)0x06840000)->dldiDriver = gDldiStub;
+
+    // Boot into Pico Loader
+    mem_setVramCMapping(MEM_VRAM_C_ARM7_00000);
+    mem_setVramDMapping(MEM_VRAM_D_ARM7_20000);
+    mem_setDsCartridgeCpu(EXMEMCNT_SLOT1_CPU_ARM7);
+    ipc_sendFifoMessage(IPC_CHANNEL_LOADER, 1);
+    ((pico_loader_9_func_t)0x06800000)();
+}