diff --git a/src/libultra/io/epirawread.c b/src/libultra/io/epirawread.c
index e910cee4d7..317f7d63ec 100644
--- a/src/libultra/io/epirawread.c
+++ b/src/libultra/io/epirawread.c
@@ -1,3 +1,57 @@
 #include "global.h"
 
-#pragma GLOBAL_ASM("asm/non_matchings/boot/epirawread/__osEPiRawReadIo.s")
+s32 __osEPiRawReadIo(OSPiHandle* handle, u32 devAddr, u32* data) {
+    s32 status;
+    OSPiHandle* curHandle;
+
+    while (status = HW_REG(PI_STATUS_REG, u32), status & (PI_STATUS_BUSY | PI_STATUS_IOBUSY)) {
+        ;
+    }
+
+    if (__osCurrentHandle[handle->domain]->type != handle->type) {
+        curHandle = __osCurrentHandle[handle->domain];
+
+        if (handle->domain == 0) {
+            if (curHandle->latency != handle->latency) {
+                HW_REG(PI_BSD_DOM1_LAT_REG, u32) = handle->latency;
+            }
+
+            if (curHandle->pageSize != handle->pageSize) {
+                HW_REG(PI_BSD_DOM1_PGS_REG, u32) = handle->pageSize;
+            }
+
+            if (curHandle->relDuration != handle->relDuration) {
+                HW_REG(PI_BSD_DOM1_RLS_REG, u32) = handle->relDuration;
+            }
+
+            if (curHandle->pulse != handle->pulse) {
+                HW_REG(PI_BSD_DOM1_PWD_REG, u32) = handle->pulse;
+            }
+        } else {
+            if (curHandle->latency != handle->latency) {
+                HW_REG(PI_BSD_DOM2_LAT_REG, u32) = handle->latency;
+            }
+
+            if (curHandle->pageSize != handle->pageSize) {
+                HW_REG(PI_BSD_DOM2_PGS_REG, u32) = handle->pageSize;
+            }
+
+            if (curHandle->relDuration != handle->relDuration) {
+                HW_REG(PI_BSD_DOM2_RLS_REG, u32) = handle->relDuration;
+            }
+
+            if (curHandle->pulse != handle->pulse) {
+                HW_REG(PI_BSD_DOM2_PWD_REG, u32) = handle->pulse;
+            }
+        }
+
+        curHandle->type = handle->type;
+        curHandle->latency = handle->latency;
+        curHandle->pageSize = handle->pageSize;
+        curHandle->relDuration = handle->relDuration;
+        curHandle->pulse = handle->pulse;
+    }
+
+    *data = HW_REG(handle->baseAddress | devAddr, u32);
+    return 0;
+}