From 9fa0a7f1da1b70bee995f53c6c96c43189018772 Mon Sep 17 00:00:00 2001
From: mrb0nk500 <b0nk@b0nk.xyz>
Date: Wed, 1 Feb 2023 18:45:02 -0400
Subject: global: Import Dolphin SDK

This version comes from the Metroid Prime decompilation project.
https://github.com/PrimeDecomp/prime
---
 src/Dolphin/si/SIBios.c         | 772 ++++++++++++++++++++++++++++++++++++++++
 src/Dolphin/si/SISamplingRate.c |  54 +++
 2 files changed, 826 insertions(+)
 create mode 100644 src/Dolphin/si/SIBios.c
 create mode 100644 src/Dolphin/si/SISamplingRate.c

(limited to 'src/Dolphin/si')

diff --git a/src/Dolphin/si/SIBios.c b/src/Dolphin/si/SIBios.c
new file mode 100644
index 0000000..00c6447
--- /dev/null
+++ b/src/Dolphin/si/SIBios.c
@@ -0,0 +1,772 @@
+#include <dolphin/OSRtcPriv.h>
+#include <dolphin/os.h>
+#include <dolphin/sipriv.h>
+
+vu32 __SIRegs[64] : 0xCC006400;
+
+extern OSTime __OSGetSystemTime();
+
+const char* __SIVersion = "<< Dolphin SDK - SI\trelease build: Sep  5 2002 05:33:08 (0x2301) >>";
+
+typedef struct SIControl {
+  s32 chan;
+  u32 poll;
+  u32 inputBytes;
+  void* input;
+  SICallback callback;
+} SIControl;
+
+static SIControl Si = {
+    -1, 0, 0, NULL, NULL,
+};
+
+typedef struct SIComm_s {
+  u32 tcint : 1;
+  u32 tcintmsk : 1;
+  u32 comerr : 1;
+  u32 rdstint : 1;
+  u32 rdstintmsk : 1;
+  u32 pad0 : 4;
+  u32 outlngth : 7;
+  u32 pad1 : 1;
+  u32 inlngth : 7;
+  u32 pad2 : 5;
+  u32 channel : 2;
+  u32 tstart : 1;
+} SIComm_s;
+
+typedef union SIComm_u {
+  u32 val;
+  SIComm_s f;
+} SIComm_u;
+
+static SIPacket Packet[SI_MAX_CHAN];
+static OSAlarm Alarm[SI_MAX_CHAN];
+static u32 Type[SI_MAX_CHAN] = {
+    SI_ERROR_NO_RESPONSE,
+    SI_ERROR_NO_RESPONSE,
+    SI_ERROR_NO_RESPONSE,
+    SI_ERROR_NO_RESPONSE,
+};
+
+static OSTime TypeTime[SI_MAX_CHAN];
+static OSTime XferTime[SI_MAX_CHAN];
+
+static SITypeAndStatusCallback TypeCallback[SI_MAX_CHAN][4];
+static __OSInterruptHandler RDSTHandler[4];
+
+u32 __PADFixBits;
+
+static BOOL __SITransfer(s32 chan, void* output, u32 outputBytes, void* input, u32 inputBytes,
+                         SICallback callback);
+
+static BOOL InputBufferValid[SI_MAX_CHAN];
+static u32 InputBuffer[SI_MAX_CHAN][2];
+static vu32 InputBufferVcount[SI_MAX_CHAN];
+
+static BOOL SIGetResponseRaw(s32 chan);
+static void GetTypeCallback(s32 chan, u32 error, OSContext* context);
+
+BOOL SIBusy() { return Si.chan != -1 ? TRUE : FALSE; }
+
+BOOL SIIsChanBusy(s32 chan) { return (Packet[chan].chan != -1 || Si.chan == chan); }
+
+static void SIClearTCInterrupt() {
+  u32 reg;
+
+  reg = __SIRegs[13];
+  reg |= 0x80000000;
+  reg &= ~0x00000001;
+  __SIRegs[13] = reg;
+}
+
+static u32 CompleteTransfer() {
+  u32 sr;
+  u32 i;
+  u32 rLen;
+  u8* input;
+
+  sr = __SIRegs[14];
+
+  SIClearTCInterrupt();
+
+  if (Si.chan != -1) {
+    XferTime[Si.chan] = __OSGetSystemTime();
+
+    input = Si.input;
+
+    rLen = Si.inputBytes / 4;
+    for (i = 0; i < rLen; i++) {
+      *(u32*)input = __SIRegs[32 + i];
+      input += 4;
+    }
+
+    rLen = Si.inputBytes & 3;
+    if (rLen) {
+      u32 temp = __SIRegs[32 + i];
+      for (i = 0; i < rLen; i++) {
+        *input++ = (u8)((temp >> ((3 - i) * 8)) & 0xff);
+      }
+    }
+
+    if (__SIRegs[13] & 0x20000000) {
+      sr >>= 8 * (3 - Si.chan);
+      sr &= 0xf;
+
+      if ((sr & SI_ERROR_NO_RESPONSE) && !(Type[Si.chan] & SI_ERROR_BUSY)) {
+        Type[Si.chan] = SI_ERROR_NO_RESPONSE;
+      }
+      if (sr == 0) {
+        sr = SI_ERROR_COLLISION;
+      }
+    } else {
+      TypeTime[Si.chan] = __OSGetSystemTime();
+      sr = 0;
+    }
+
+    Si.chan = -1;
+  }
+  return sr;
+}
+
+static void SITransferNext(s32 chan) {
+  int i;
+  SIPacket* packet;
+
+  for (i = 0; i < SI_MAX_CHAN; ++i) {
+    ++chan;
+    chan %= SI_MAX_CHAN;
+    packet = &Packet[chan];
+    if (packet->chan != -1 && packet->fire <= __OSGetSystemTime()) {
+      if (__SITransfer(packet->chan, packet->output, packet->outputBytes, packet->input,
+                       packet->inputBytes, packet->callback)) {
+        OSCancelAlarm(&Alarm[chan]);
+        packet->chan = -1;
+      }
+      break;
+    }
+  }
+}
+
+static void SIInterruptHandler(__OSInterrupt interrupt, OSContext* context) {
+  u32 reg;
+
+  reg = __SIRegs[13];
+
+  if ((reg & 0xc0000000) == 0xc0000000) {
+    s32 chan;
+    u32 sr;
+    SICallback callback;
+
+    chan = Si.chan;
+    sr = CompleteTransfer();
+    callback = Si.callback;
+    Si.callback = 0;
+
+    SITransferNext(chan);
+
+    if (callback) {
+      callback(chan, sr, context);
+    }
+
+    sr = __SIRegs[14];
+    sr &= 0xf000000 >> (8 * chan);
+    __SIRegs[14] = sr;
+
+    if (Type[chan] == SI_ERROR_BUSY && !SIIsChanBusy(chan)) {
+      static u32 cmdTypeAndStatus = 0 << 24;
+      SITransfer(chan, &cmdTypeAndStatus, 1, &Type[chan], 3, GetTypeCallback,
+                 OSMicrosecondsToTicks(65));
+    }
+  }
+
+  if ((reg & 0x18000000) == 0x18000000) {
+
+    int i;
+    u32 vcount;
+    u32 x;
+
+    vcount = VIGetCurrentLine() + 1;
+    x = (Si.poll & 0x03ff0000) >> 16;
+
+    for (i = 0; i < SI_MAX_CHAN; ++i) {
+      if (SIGetResponseRaw(i)) {
+        InputBufferVcount[i] = vcount;
+      }
+    }
+
+    for (i = 0; i < SI_MAX_CHAN; ++i) {
+      if (!(Si.poll & (SI_CHAN0_BIT >> (31 - 7 + i)))) {
+        continue;
+      }
+      if (InputBufferVcount[i] == 0 || InputBufferVcount[i] + (x / 2) < vcount) {
+        return;
+      }
+    }
+
+    for (i = 0; i < SI_MAX_CHAN; ++i) {
+      InputBufferVcount[i] = 0;
+    }
+
+    for (i = 0; i < 4; ++i) {
+      if (RDSTHandler[i]) {
+        RDSTHandler[i](interrupt, context);
+      }
+    }
+  }
+}
+
+static BOOL SIEnablePollingInterrupt(BOOL enable) {
+  BOOL enabled;
+  BOOL rc;
+  u32 reg;
+  int i;
+
+  enabled = OSDisableInterrupts();
+  reg = __SIRegs[13];
+  rc = (reg & 0x08000000) ? TRUE : FALSE;
+  if (enable) {
+    reg |= 0x08000000;
+    for (i = 0; i < SI_MAX_CHAN; ++i) {
+      InputBufferVcount[i] = 0;
+    }
+  } else {
+    reg &= ~0x08000000;
+  }
+  reg &= ~0x80000001;
+  __SIRegs[13] = reg;
+  OSRestoreInterrupts(enabled);
+  return rc;
+}
+
+BOOL SIRegisterPollingHandler(__OSInterruptHandler handler) {
+  BOOL enabled;
+  int i;
+
+  enabled = OSDisableInterrupts();
+  for (i = 0; i < 4; ++i) {
+    if (RDSTHandler[i] == handler) {
+      OSRestoreInterrupts(enabled);
+      return TRUE;
+    }
+  }
+  for (i = 0; i < 4; ++i) {
+    if (RDSTHandler[i] == 0) {
+      RDSTHandler[i] = handler;
+      SIEnablePollingInterrupt(TRUE);
+      OSRestoreInterrupts(enabled);
+      return TRUE;
+    }
+  }
+  OSRestoreInterrupts(enabled);
+  return FALSE;
+}
+
+BOOL SIUnregisterPollingHandler(__OSInterruptHandler handler) {
+  BOOL enabled;
+  int i;
+
+  enabled = OSDisableInterrupts();
+  for (i = 0; i < 4; ++i) {
+    if (RDSTHandler[i] == handler) {
+      RDSTHandler[i] = 0;
+      for (i = 0; i < 4; ++i) {
+        if (RDSTHandler[i]) {
+          break;
+        }
+      }
+      if (i == 4) {
+        SIEnablePollingInterrupt(FALSE);
+      }
+      OSRestoreInterrupts(enabled);
+      return TRUE;
+      break;
+    }
+  }
+  OSRestoreInterrupts(enabled);
+  return FALSE;
+}
+
+void SIInit(void) {
+  OSRegisterVersion(__SIVersion);
+
+  Packet[0].chan = Packet[1].chan = Packet[2].chan = Packet[3].chan = -1;
+
+  Si.poll = 0;
+  SISetSamplingRate(0);
+
+  while (__SIRegs[13] & 1)
+    ;
+
+  __SIRegs[13] = 0x80000000;
+
+  __OSSetInterruptHandler(__OS_INTERRUPT_PI_SI, SIInterruptHandler);
+  __OSUnmaskInterrupts(OS_INTERRUPTMASK_PI_SI);
+
+  SIGetType(0);
+  SIGetType(1);
+  SIGetType(2);
+  SIGetType(3);
+}
+
+#define ROUND(n, a) (((u32)(n) + (a)-1) & ~((a)-1))
+
+static BOOL __SITransfer(s32 chan, void* output, u32 outputBytes, void* input, u32 inputBytes,
+                         SICallback callback) {
+  BOOL enabled;
+  u32 rLen;
+  u32 i;
+  u32 sr;
+  SIComm_u comcsr;
+
+  enabled = OSDisableInterrupts();
+  if (Si.chan != -1) {
+    OSRestoreInterrupts(enabled);
+    return FALSE;
+  }
+
+  sr = __SIRegs[14];
+  sr &= (0xf000000) >> (8 * chan);
+  __SIRegs[14] = sr;
+
+  Si.chan = chan;
+  Si.callback = callback;
+  Si.inputBytes = inputBytes;
+  Si.input = input;
+
+  rLen = ROUND(outputBytes, 4) / 4;
+  for (i = 0; i < rLen; i++) {
+    __SIRegs[32 + i] = ((u32*)output)[i];
+  }
+
+  comcsr.val = __SIRegs[13];
+  comcsr.f.tcint = 1;
+  comcsr.f.tcintmsk = callback ? 1 : 0;
+  comcsr.f.outlngth = (outputBytes == SI_MAX_COMCSR_OUTLNGTH) ? 0 : outputBytes;
+  comcsr.f.inlngth = (inputBytes == SI_MAX_COMCSR_INLNGTH) ? 0 : inputBytes;
+  comcsr.f.channel = chan;
+  comcsr.f.tstart = 1;
+  __SIRegs[13] = comcsr.val;
+
+  OSRestoreInterrupts(enabled);
+
+  return TRUE;
+}
+
+u32 SISync(void) {
+  BOOL enabled;
+  u32 sr;
+
+  while (__SIRegs[13] & 1)
+    ;
+
+  enabled = OSDisableInterrupts();
+  sr = CompleteTransfer();
+
+  SITransferNext(SI_MAX_CHAN);
+
+  OSRestoreInterrupts(enabled);
+
+  return sr;
+}
+
+u32 SIGetStatus(s32 chan) {
+  BOOL enabled;
+  u32 sr;
+  int chanShift;
+
+  enabled = OSDisableInterrupts();
+  sr = __SIRegs[14];
+  chanShift = 8 * (SI_MAX_CHAN - 1 - chan);
+  sr >>= chanShift;
+  if (sr & SI_ERROR_NO_RESPONSE) {
+    if (!(Type[chan] & SI_ERROR_BUSY)) {
+      Type[chan] = SI_ERROR_NO_RESPONSE;
+    }
+  }
+  OSRestoreInterrupts(enabled);
+  return sr;
+}
+
+void SISetCommand(s32 chan, u32 command) { __SIRegs[3 * chan] = command; }
+
+u32 SIGetCommand(s32 chan) { return __SIRegs[3 * chan]; }
+
+void SITransferCommands(void) { __SIRegs[14] = 0x80000000; }
+
+u32 SISetXY(u32 x, u32 y) {
+  u32 poll;
+  BOOL enabled;
+
+  poll = x << 16;
+  poll |= y << 8;
+
+  enabled = OSDisableInterrupts();
+  Si.poll &= ~(0x03ff0000 | 0x0000ff00);
+  Si.poll |= poll;
+  poll = Si.poll;
+  __SIRegs[12] = poll;
+  OSRestoreInterrupts(enabled);
+  return poll;
+}
+
+u32 SIEnablePolling(u32 poll) {
+  BOOL enabled;
+  u32 en;
+
+  if (poll == 0) {
+    return Si.poll;
+  }
+
+  enabled = OSDisableInterrupts();
+
+  poll >>= (31 - 7);
+  en = poll & 0xf0;
+
+  poll &= (en >> 4) | 0x03fffff0;
+
+  poll &= ~0x03ffff00;
+
+  Si.poll &= ~(en >> 4);
+
+  Si.poll |= poll;
+
+  poll = Si.poll;
+
+  SITransferCommands();
+
+  __SIRegs[12] = poll;
+
+  OSRestoreInterrupts(enabled);
+
+  return poll;
+}
+
+u32 SIDisablePolling(u32 poll) {
+  BOOL enabled;
+
+  if (poll == 0) {
+    return Si.poll;
+  }
+
+  enabled = OSDisableInterrupts();
+
+  poll >>= (31 - 7);
+  poll &= 0xf0;
+
+  poll = Si.poll & ~poll;
+
+  __SIRegs[12] = poll;
+  Si.poll = poll;
+
+  OSRestoreInterrupts(enabled);
+  return poll;
+}
+
+static BOOL SIGetResponseRaw(s32 chan) {
+  u32 sr;
+
+  sr = SIGetStatus(chan);
+  if (sr & SI_ERROR_RDST) {
+    InputBuffer[chan][0] = __SIRegs[3 * chan + 1];
+    InputBuffer[chan][1] = __SIRegs[3 * chan + 2];
+    InputBufferValid[chan] = TRUE;
+    return TRUE;
+  }
+  return FALSE;
+}
+
+BOOL SIGetResponse(s32 chan, void* data) {
+  BOOL rc;
+  BOOL enabled;
+
+  enabled = OSDisableInterrupts();
+  SIGetResponseRaw(chan);
+  rc = InputBufferValid[chan];
+  InputBufferValid[chan] = FALSE;
+  if (rc) {
+    ((u32*)data)[0] = InputBuffer[chan][0];
+    ((u32*)data)[1] = InputBuffer[chan][1];
+  }
+  OSRestoreInterrupts(enabled);
+  return rc;
+}
+
+static void AlarmHandler(OSAlarm* alarm, OSContext* context) {
+#pragma unused(context)
+  s32 chan;
+  SIPacket* packet;
+
+  chan = alarm - Alarm;
+  packet = &Packet[chan];
+  if (packet->chan != -1) {
+    if (__SITransfer(packet->chan, packet->output, packet->outputBytes, packet->input,
+                     packet->inputBytes, packet->callback)) {
+      packet->chan = -1;
+    }
+  }
+}
+
+BOOL SITransfer(s32 chan, void* output, u32 outputBytes, void* input, u32 inputBytes,
+                SICallback callback, OSTime delay) {
+  BOOL enabled;
+  SIPacket* packet = &Packet[chan];
+  OSTime now;
+  OSTime fire;
+
+  enabled = OSDisableInterrupts();
+  if (packet->chan != -1 || Si.chan == chan) {
+    OSRestoreInterrupts(enabled);
+    return FALSE;
+  }
+
+  now = __OSGetSystemTime();
+  if (delay == 0) {
+    fire = now;
+  } else {
+    fire = XferTime[chan] + delay;
+  }
+  if (now < fire) {
+    delay = fire - now;
+    OSSetAlarm(&Alarm[chan], delay, AlarmHandler);
+  } else if (__SITransfer(chan, output, outputBytes, input, inputBytes, callback)) {
+    OSRestoreInterrupts(enabled);
+    return TRUE;
+  }
+
+  packet->chan = chan;
+  packet->output = output;
+  packet->outputBytes = outputBytes;
+  packet->input = input;
+  packet->inputBytes = inputBytes;
+  packet->callback = callback;
+  packet->fire = fire;
+
+  OSRestoreInterrupts(enabled);
+  return TRUE;
+}
+
+static void CallTypeAndStatusCallback(s32 chan, u32 type) {
+  SITypeAndStatusCallback callback;
+  int i;
+
+  for (i = 0; i < 4; ++i) {
+    callback = TypeCallback[chan][i];
+    if (callback) {
+      TypeCallback[chan][i] = 0;
+      callback(chan, type);
+    }
+  }
+}
+
+static void GetTypeCallback(s32 chan, u32 error, OSContext* context) {
+  static u32 cmdFixDevice[SI_MAX_CHAN];
+  u32 type;
+  u32 chanBit;
+  BOOL fix;
+  u32 id;
+
+  Type[chan] &= ~SI_ERROR_BUSY;
+  Type[chan] |= error;
+  TypeTime[chan] = __OSGetSystemTime();
+
+  type = Type[chan];
+
+  chanBit = SI_CHAN0_BIT >> chan;
+  fix = (BOOL)(__PADFixBits & chanBit);
+  __PADFixBits &= ~chanBit;
+
+  if ((error &
+       (SI_ERROR_UNDER_RUN | SI_ERROR_OVER_RUN | SI_ERROR_NO_RESPONSE | SI_ERROR_COLLISION)) ||
+      (type & SI_TYPE_MASK) != SI_TYPE_DOLPHIN || !(type & SI_GC_WIRELESS) ||
+      (type & SI_WIRELESS_IR)) {
+    OSSetWirelessID(chan, 0);
+    CallTypeAndStatusCallback(chan, Type[chan]);
+    return;
+  }
+
+  id = (u32)(OSGetWirelessID(chan) << 8);
+
+  if (fix && (id & SI_WIRELESS_FIX_ID)) {
+    cmdFixDevice[chan] = 0x4Eu << 24 | (id & SI_WIRELESS_TYPE_ID) | SI_WIRELESS_FIX_ID;
+    Type[chan] = SI_ERROR_BUSY;
+    SITransfer(chan, &cmdFixDevice[chan], 3, &Type[chan], 3, GetTypeCallback, 0);
+    return;
+  }
+
+  if (type & SI_WIRELESS_FIX_ID) {
+    if ((id & SI_WIRELESS_TYPE_ID) != (type & SI_WIRELESS_TYPE_ID)) {
+      if (!(id & SI_WIRELESS_FIX_ID)) {
+        id = type & SI_WIRELESS_TYPE_ID;
+        id |= SI_WIRELESS_FIX_ID;
+        OSSetWirelessID(chan, (u16)((id >> 8) & 0xffff));
+      }
+
+      cmdFixDevice[chan] = 0x4E << 24 | id;
+      Type[chan] = SI_ERROR_BUSY;
+      SITransfer(chan, &cmdFixDevice[chan], 3, &Type[chan], 3, GetTypeCallback, 0);
+      return;
+    }
+  } else if (type & SI_WIRELESS_RECEIVED) {
+    id = type & SI_WIRELESS_TYPE_ID;
+    id |= SI_WIRELESS_FIX_ID;
+
+    OSSetWirelessID(chan, (u16)((id >> 8) & 0xffff));
+
+    cmdFixDevice[chan] = 0x4E << 24 | id;
+    Type[chan] = SI_ERROR_BUSY;
+    SITransfer(chan, &cmdFixDevice[chan], 3, &Type[chan], 3, GetTypeCallback, 0);
+    return;
+  } else {
+    OSSetWirelessID(chan, 0);
+  }
+
+  CallTypeAndStatusCallback(chan, Type[chan]);
+}
+
+u32 SIGetType(s32 chan) {
+  static u32 cmdTypeAndStatus;
+  BOOL enabled;
+  u32 type;
+  OSTime diff;
+
+  enabled = OSDisableInterrupts();
+
+  type = Type[chan];
+  diff = __OSGetSystemTime() - TypeTime[chan];
+  if (Si.poll & (0x80 >> chan)) {
+    if (type != SI_ERROR_NO_RESPONSE) {
+      TypeTime[chan] = __OSGetSystemTime();
+      OSRestoreInterrupts(enabled);
+      return type;
+    } else {
+      type = Type[chan] = SI_ERROR_BUSY;
+    }
+  } else if (diff <= OSMillisecondsToTicks(50) && type != SI_ERROR_NO_RESPONSE) {
+    OSRestoreInterrupts(enabled);
+    return type;
+  } else if (diff <= OSMillisecondsToTicks(75)) {
+    Type[chan] = SI_ERROR_BUSY;
+  } else {
+    type = Type[chan] = SI_ERROR_BUSY;
+  }
+  TypeTime[chan] = __OSGetSystemTime();
+
+  SITransfer(chan, &cmdTypeAndStatus, 1, &Type[chan], 3, GetTypeCallback,
+             OSMicrosecondsToTicks(65));
+
+  OSRestoreInterrupts(enabled);
+  return type;
+}
+
+u32 SIGetTypeAsync(s32 chan, SITypeAndStatusCallback callback) {
+  BOOL enabled;
+  u32 type;
+
+  enabled = OSDisableInterrupts();
+  type = SIGetType(chan);
+  if (Type[chan] & SI_ERROR_BUSY) {
+    int i;
+
+    for (i = 0; i < 4; ++i) {
+      if (TypeCallback[chan][i] == callback) {
+        break;
+      }
+      if (TypeCallback[chan][i] == 0) {
+        TypeCallback[chan][i] = callback;
+        break;
+      }
+    }
+  } else {
+    callback(chan, type);
+  }
+  OSRestoreInterrupts(enabled);
+  return type;
+}
+
+u32 SIDecodeType(u32 type) {
+  u32 error;
+
+  error = type & 0xff;
+  type &= ~0xff;
+
+  if (error & SI_ERROR_NO_RESPONSE) {
+    return SI_ERROR_NO_RESPONSE;
+  }
+  if (error & (SI_ERROR_UNDER_RUN | SI_ERROR_OVER_RUN | SI_ERROR_COLLISION | SI_ERROR_UNKNOWN)) {
+    return SI_ERROR_UNKNOWN;
+  }
+  if (error) {
+    return SI_ERROR_BUSY;
+  }
+
+  if ((type & SI_TYPE_MASK) == SI_TYPE_N64) {
+    switch (type & 0xffff0000) {
+    case SI_N64_CONTROLLER:
+    case SI_N64_MIC:
+    case SI_N64_KEYBOARD:
+    case SI_N64_MOUSE:
+    case SI_GBA:
+      return type & 0xffff0000;
+      break;
+    }
+    return SI_ERROR_UNKNOWN;
+  }
+
+  if ((type & SI_TYPE_MASK) != SI_TYPE_GC) {
+
+    return SI_ERROR_UNKNOWN;
+  }
+  switch (type & 0xffff0000) {
+  case SI_GC_CONTROLLER:
+  case SI_GC_STEERING:
+    return type & 0xffff0000;
+    break;
+  }
+
+  if ((type & 0xffe00000) == SI_GC_KEYBOARD) {
+    return SI_GC_KEYBOARD;
+  }
+
+  if ((type & SI_GC_WIRELESS) && !(type & SI_WIRELESS_IR)) {
+    if ((type & SI_GC_WAVEBIRD) == SI_GC_WAVEBIRD) {
+      return SI_GC_WAVEBIRD;
+    } else if (!(type & SI_WIRELESS_STATE)) {
+      return SI_GC_RECEIVER;
+    }
+  }
+
+  if ((type & SI_GC_CONTROLLER) == SI_GC_CONTROLLER) {
+    return SI_GC_CONTROLLER;
+  }
+  return SI_ERROR_UNKNOWN;
+}
+
+u32 SIProbe(s32 chan) { return SIDecodeType(SIGetType(chan)); }
+
+char* SIGetTypeString(u32 type) {
+  switch (SIDecodeType(type)) {
+  case SI_ERROR_NO_RESPONSE:
+    return "No response";
+  case SI_N64_CONTROLLER:
+    return "N64 controller";
+  case SI_N64_MIC:
+    return "N64 microphone";
+  case SI_N64_KEYBOARD:
+    return "N64 keyboard";
+  case SI_N64_MOUSE:
+    return "N64 mouse";
+  case SI_GBA:
+    return "GameBoy Advance";
+  case SI_GC_CONTROLLER:
+    return "Standard controller";
+  case SI_GC_RECEIVER:
+    return "Wireless receiver";
+  case SI_GC_WAVEBIRD:
+    return "WaveBird controller";
+  case SI_GC_KEYBOARD:
+    return "Keyboard";
+  case SI_GC_STEERING:
+    return "Steering";
+  }
+}
diff --git a/src/Dolphin/si/SISamplingRate.c b/src/Dolphin/si/SISamplingRate.c
new file mode 100644
index 0000000..c9b96ca
--- /dev/null
+++ b/src/Dolphin/si/SISamplingRate.c
@@ -0,0 +1,54 @@
+#include "dolphin/sipriv.h"
+#include "dolphin/vi.h"
+#pragma dont_inline on
+static u32 SamplingRate;
+
+typedef struct XY {
+  u16 line;
+  u8 count;
+} XY;
+
+static XY XYNTSC[12] = {
+    {263 - 17, 2}, {15, 18}, {30, 9}, {44, 6},  {52, 5},  {65, 4},
+    {87, 3},       {87, 3}, {87, 3}, {131, 2}, {131, 2}, {131, 2},
+};
+
+static XY XYPAL[12] = {
+    {313 - 17, 2}, {15, 21}, {29, 11}, {45, 7},  {52, 6},  {63, 5},
+    {78, 4},       {104, 3}, {104, 3}, {104, 3}, {104, 3}, {156, 2},
+};
+
+void SISetSamplingRate(u32 msec) {
+  XY* xy;
+  BOOL enabled;
+
+  if (msec > 11) {
+    msec = 11;
+  }
+
+  enabled = OSDisableInterrupts();
+
+  SamplingRate = msec;
+
+  switch (VIGetTvFormat()) {
+  case VI_NTSC:
+  case VI_MPAL:
+  case VI_EURGB60:
+    xy = XYNTSC;
+    break;
+  case VI_PAL:
+    xy = XYPAL;
+    break;
+  default:
+    OSReport("SISetSamplingRate: unknown TV format. Use default.");
+    msec = 0;
+    xy = XYNTSC;
+    break;
+  }
+
+  SISetXY((__VIRegs[54] & 1 ? 2u : 1u) * xy[msec].line, xy[msec].count);
+  OSRestoreInterrupts(enabled);
+}
+
+void SIRefreshSamplingRate() { SISetSamplingRate(SamplingRate); }
+#pragma dont_inline reset
-- 
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