s32 to sio32

1 files changed, 164 insertions, 0 deletions

diff --git a/src/librfu_sio32id.c b/src/librfu_sio32id.c
new file mode 100644
index 000000000..fc5701986
--- /dev/null
+++ b/src/librfu_sio32id.c
@@ -0,0 +1,164 @@
+#include "librfu.h"
+
+static void Sio32IDIntr(void);
+static void Sio32IDInit(void);
+static s32 Sio32IDMain(void);
+
+struct RfuSIO32Id gRfuSIO32Id;
+
+static const u16 Sio32ConnectionData[] = { 0x494e, 0x544e, 0x4e45, 0x4f44 }; // NINTENDO
+static const char Sio32IDLib_Var[] = "Sio32ID_030820";
+
+s32 AgbRFU_checkID(u8 r5)
+{
+    u16 r8;
+    vu16 *r4;
+    s32 r6;
+
+    if (REG_IME == 0)
+        return -1;
+    r8 = REG_IE;
+    gSTWIStatus->state = 10;
+    STWI_set_Callback_ID(Sio32IDIntr);
+    Sio32IDInit();
+    r4 = &REG_TMCNT_L(gSTWIStatus->timerSelect);
+    r5 *= 8;
+    while (--r5 != 0xFF)
+    {
+        r6 = Sio32IDMain();
+        if (r6 != 0)
+            break;
+        r4[1] = 0;
+        r4[0] = 0;
+        r4[1] = TIMER_1024CLK | TIMER_ENABLE;
+        while (r4[0] < 32)
+            ;
+        r4[1] = 0;
+        r4[0] = 0;
+    }
+    REG_IME = 0;
+    REG_IE = r8;
+    REG_IME = 1;
+    gSTWIStatus->state = 0;
+    STWI_set_Callback_ID(NULL);
+    return r6;
+}
+
+static void Sio32IDInit(void)
+{
+    REG_IME = 0;
+    REG_IE &= ~((8 << gSTWIStatus->timerSelect) | INTR_FLAG_SERIAL);
+    REG_IME = 1;
+    REG_RCNT = 0;
+    REG_SIOCNT = SIO_32BIT_MODE;
+    REG_SIOCNT |= SIO_INTR_ENABLE | SIO_ENABLE;
+    CpuFill32(0, &gRfuSIO32Id, sizeof(struct RfuSIO32Id));
+    REG_IF = INTR_FLAG_SERIAL;
+}
+
+static s32 Sio32IDMain(void)
+{
+    u8 r12;
+
+    switch (r12 = gRfuSIO32Id.unk1)
+    {
+    case 0:
+        gRfuSIO32Id.unk0 = 1;
+        REG_SIOCNT |= SIO_38400_BPS;
+        REG_IME = r12;
+        REG_IE |= INTR_FLAG_SERIAL;
+        REG_IME = 1;
+        gRfuSIO32Id.unk1 = 1;
+        *(vu8 *)&REG_SIOCNT |= SIO_ENABLE;
+        break;
+    case 1:
+        if (gRfuSIO32Id.unkA == 0)
+        {
+            if (gRfuSIO32Id.unk0 == 1)
+            {
+                if (gRfuSIO32Id.unk2 == 0)
+                {
+                    REG_IME = gRfuSIO32Id.unk2;
+                    REG_SIOCNT |= SIO_ENABLE;
+                    REG_IME = r12;
+                }
+            }
+            else if (gRfuSIO32Id.unk4 != 0x8001 && !gRfuSIO32Id.unk2)
+            {
+                REG_IME = gRfuSIO32Id.unk2;
+                REG_IE &= ~INTR_FLAG_SERIAL;
+                REG_IME = r12;
+                REG_SIOCNT = gRfuSIO32Id.unk2;
+                REG_SIOCNT = SIO_32BIT_MODE;
+                REG_IF = INTR_FLAG_SERIAL;
+                REG_SIOCNT |= SIO_INTR_ENABLE | SIO_ENABLE;
+                REG_IME = gRfuSIO32Id.unk2;
+                REG_IE |= INTR_FLAG_SERIAL;
+                REG_IME = r12;
+            }
+            break;
+        }
+        else
+        {
+            gRfuSIO32Id.unk1 = 2;
+            // fallthrough
+        }
+    default:
+        return gRfuSIO32Id.unkA;
+    }
+    return 0;
+}
+
+static void Sio32IDIntr(void)
+{
+    u32 r5;
+    u16 r0;
+#ifndef NONMATCHING
+    register u32 r1 asm("r1");
+    register u16 r0_ asm("r0");
+#else
+    u32 r1;
+    u16 r0_;
+#endif
+
+    r5 = REG_SIODATA32;
+    if (gRfuSIO32Id.unk0 != 1)
+        REG_SIOCNT |= SIO_ENABLE;
+    r1 = 16 * gRfuSIO32Id.unk0; // to handle side effect of inline asm
+    r1 = (r5 << r1) >> 16;
+    r5 = (r5 << 16 * (1 - gRfuSIO32Id.unk0)) >> 16;
+    if (gRfuSIO32Id.unkA == 0)
+    {
+        if (r1 == gRfuSIO32Id.unk6)
+        {
+            if (gRfuSIO32Id.unk2 > 3)
+            {
+                gRfuSIO32Id.unkA = r5;
+            }
+            else if (r1 == (u16)~gRfuSIO32Id.unk4)
+            {
+                r0_ = ~gRfuSIO32Id.unk6;
+                if (r5 == r0_)
+                    ++gRfuSIO32Id.unk2;
+            }
+        }
+        else
+        {
+            gRfuSIO32Id.unk2 = gRfuSIO32Id.unkA;
+        }
+    }
+    if (gRfuSIO32Id.unk2 < 4)
+        gRfuSIO32Id.unk4 = *(gRfuSIO32Id.unk2 + Sio32ConnectionData);
+    else
+        gRfuSIO32Id.unk4 = 0x8001;
+    gRfuSIO32Id.unk6 = ~r5;
+    REG_SIODATA32 = (gRfuSIO32Id.unk4 << 16 * (1 - gRfuSIO32Id.unk0))
+                  + (gRfuSIO32Id.unk6 << 16 * gRfuSIO32Id.unk0);
+    if (gRfuSIO32Id.unk0 == 1 && (gRfuSIO32Id.unk2 || r5 == 0x494E))
+    {
+        for (r0 = 0; r0 < 600; ++r0)
+            ;
+        if (gRfuSIO32Id.unkA == 0)
+            REG_SIOCNT |= SIO_ENABLE;
+    }
+}