diff --git a/Makefile b/Makefile
index c7e6122..60d3152 100644
--- a/Makefile
+++ b/Makefile
@@ -45,7 +45,7 @@ CC_OLD = tools/ido_recomp/linux/5.3/cc
 ASFLAGS = -EB -mtune=vr4300 -march=vr4300 -Iinclude
 
 # we support Microsoft extensions such as anonymous structs, which the compiler does support but warns for their usage. Surpress the warnings with -woff.
-CFLAGS  = -G 0 -non_shared -Xfullwarn -Xcpluscomm -Iinclude -Wab,-r4300_mul -D _LANGUAGE_C -woff 649,838,712 -mips2
+CFLAGS  = -G 0 -non_shared -Xfullwarn -Xcpluscomm -Iinclude -Wab,-r4300_mul -D _LANGUAGE_C -D F3DEX_GBI -woff 649,838,712 -mips2
 
 LDFLAGS = -T undefined_syms.txt -T undefined_syms_auto.txt -T undefined_funcs_auto.txt -T $(BUILD_DIR)/$(LD_SCRIPT) -Map $(BUILD_DIR)/$(TARGET).map --no-check-sections
 
@@ -60,6 +60,7 @@ build/src/libultra/os/osSendMesg.c.o: OPTFLAGS := -O1
 build/src/libultra/os/osStopThread.c.o: OPTFLAGS := -O1
 build/src/libultra/os/osRecvMesg.c.o: OPTFLAGS := -O1
 build/src/libultra/io/pigetcmdq.c.o: OPTFLAGS := -O1
+build/src/libultra/io/sptask.c.o: OPTFLAGS := -O1
 
 default: all
 
diff --git a/include/PR/rcp.h b/include/PR/rcp.h
index 3795ff7..1cc898b 100644
--- a/include/PR/rcp.h
+++ b/include/PR/rcp.h
@@ -1,6 +1,10 @@
 #ifndef _RCP_H_
 #define _RCP_H_
 
+#ifdef _LANGUAGE_C
+#define HW_REG(reg, type) *(volatile type*)((reg) | 0xA0000000)
+#endif
+
 /**************************************************************************
  *                                                                        *
  *               Copyright (C) 1995, Silicon Graphics, Inc.               *
@@ -600,7 +604,6 @@ The Indy development board use cartridge domain 1:
 #define VI_PAL_CLOCK		49656530        /* Hz = 49.656530 MHz */
 #define VI_MPAL_CLOCK		48628316        /* Hz = 48.628316 MHz */
 
-
 /*************************************************************************
  * Audio Interface (AI) Registers 
  *
diff --git a/splat.yaml b/splat.yaml
index 39f536b..61d00ef 100644
--- a/splat.yaml
+++ b/splat.yaml
@@ -166,7 +166,7 @@ segments:
     - [0x578F0, asm, libultra/gu/scale]
     - [0x57990, asm, libultra/gu/sinf]
     - [0x57B50, asm, libultra/al/sl]
-    - [0x57C10, asm, libultra/io/sptask]
+    - [0x57C10, c, libultra/io/sptask]
     - [0x57F00, asm, libultra/os/destroythread]
     - [0x58010, asm, libultra/libc/ll]
     - [0x582D0, asm, libultra/os/exceptasm]
diff --git a/src/libultra/io/sptask.c b/src/libultra/io/sptask.c
new file mode 100644
index 0000000..a0ebde9
--- /dev/null
+++ b/src/libultra/io/sptask.c
@@ -0,0 +1,60 @@
+#include <ultra64.h>
+
+#define _osVirtualToPhysical(ptr)              \
+    if (ptr != NULL) {                         \
+        ptr = (void*)osVirtualToPhysical(ptr); \
+    }
+
+extern OSTask sTmpTask;
+
+OSTask* _VirtualToPhysicalTask(OSTask* intp) {
+    OSTask* tp = &sTmpTask;
+
+    _bcopy(intp, tp, sizeof(OSTask));
+
+    _osVirtualToPhysical(tp->t.ucode);
+    _osVirtualToPhysical(tp->t.ucode_data);
+    _osVirtualToPhysical(tp->t.dram_stack);
+    _osVirtualToPhysical(tp->t.output_buff);
+    _osVirtualToPhysical(tp->t.output_buff_size);
+    _osVirtualToPhysical(tp->t.data_ptr);
+    _osVirtualToPhysical(tp->t.yield_data_ptr);
+
+    return tp;
+}
+
+void osSpTaskLoad(OSTask* intp) {
+    OSTask* tp = _VirtualToPhysicalTask(intp);
+
+    if (tp->t.flags & OS_TASK_YIELDED) {
+        tp->t.ucode_data = tp->t.yield_data_ptr;
+        tp->t.ucode_data_size = tp->t.yield_data_size;
+        intp->t.flags &= ~OS_TASK_YIELDED;
+
+        if (tp->t.flags & OS_TASK_LOADABLE) {
+            tp->t.ucode = (u64*)HW_REG((u32)intp->t.yield_data_ptr + OS_YIELD_DATA_SIZE - 4, u32);
+        }
+    }
+    osWritebackDCache(tp, sizeof(OSTask));
+    __osSpSetStatus(SP_CLR_SIG0 | SP_CLR_SIG1 | SP_CLR_SIG2 | SP_SET_INTR_BREAK);
+
+    while (__osSpSetPc((void*)SP_IMEM_START) == -1) {
+        ;
+    }
+    while (__osSpRawStartDma(OS_WRITE, (void*)(SP_IMEM_START - sizeof(*tp)), tp, sizeof(OSTask)) == -1) {
+        ;
+    }
+    while (__osSpDeviceBusy()) {
+        ;
+    }
+    while (__osSpRawStartDma(OS_WRITE, (void*)SP_IMEM_START, tp->t.ucode_boot, tp->t.ucode_boot_size) == -1) {
+        ;
+    }
+}
+
+void osSpTaskStartGo(OSTask* tp) {
+    while (__osSpDeviceBusy()) {
+        ;
+    }
+    __osSpSetStatus(SP_SET_INTR_BREAK | SP_CLR_SSTEP | SP_CLR_BROKE | SP_CLR_HALT);
+}
diff --git a/tools/symbol_addrs.txt b/tools/symbol_addrs.txt
index b373b6f..db78df6 100644
--- a/tools/symbol_addrs.txt
+++ b/tools/symbol_addrs.txt
@@ -282,4 +282,8 @@ _timeToSamples = 0x8005FBDC;
 alUnlink = 0x80056F50;
 alLink = 0x80056F80;
 alClose = 0x80056FA4;
-alInit = 0x80056FDC;
\ No newline at end of file
+alInit = 0x80056FDC;
+_VirtualToPhysicalTask = 0x80057010;
+osSpTaskLoad = 0x8005712C;
+osSpTaskStartGo = 0x800572BC;
+sTmpTask = 0x80102100;
\ No newline at end of file