1 files changed, 28 insertions, 0 deletions
diff --git a/arm9/lib/src/OS_entropy.c b/arm9/lib/src/OS_entropy.c
new file mode 100644
index 00000000..bfc95882
--- /dev/null
+++ b/arm9/lib/src/OS_entropy.c
@@ -0,0 +1,28 @@
+//
+// Created by red031000 on 2020-05-03.
+//
+
+#include "function_target.h"
+#include "consts.h"
+#include "OS_entropy.h"
+
+u32 * const HW_REG_006 = (u32 *) 0x04000006;
+u32 * const HW_REG_130 = (u32 *) 0x04000130;
+u32 * const HW_REG_600 = (u32 *) 0x04000600;
+
+u32 * const OSi_TickCounter = (u32 *) 0x021D37B4;
+
+ARM_FUNC void OS_GetLowEntropyData(u32 * arr)
+{
+    OSSystemWork* work = OS_GetSystemWork();
+    u16 x = *((u16 *)HW_REG_006);
+    u8 * nvramUserInfo = work->nvramUserInfo;
+    u8 r5 = nvramUserInfo[0x74];
+    arr[0] = (OS_GetTickLo()<<0x10) | x ;
+    arr[1] = (OSi_TickCounter[0]<<0x10) ^ r5[2];
+    u32 what = OSi_TickCounter[0];
+    what = OSi_TickCounter[1];
+    arr[2] = *((u32 *)r4) ^ what ^ *(u32 *)((u8 *)work+0x3c);
+    arr[2] ^= *HW_REG_600;
+    // ...
+}
+\ No newline at end of file