First proper commit.

src/boot/is_debug.c

@@ -0,0 +1,93 @@
+#include <z64.h>
+#include <global.h>
+
+OSPiHandle* sISVHandle; //official name : is_Handle
+
+#define gISVDbgPrnAdrs ((ISVDbg*)0xb3ff0000)
+#define ASCII_TO_U32(a, b, c, d) ((u32)((a << 24) | (b << 16) | (c << 8) | (d << 0)))
+
+void isPrintfInit()
+{
+    sISVHandle = osCartRomInit();
+    osEPiWriteIo(sISVHandle, (u32)&gISVDbgPrnAdrs->put, 0);
+    osEPiWriteIo(sISVHandle, (u32)&gISVDbgPrnAdrs->get, 0);
+    osEPiWriteIo(sISVHandle, (u32)&gISVDbgPrnAdrs->magic, ASCII_TO_U32('I','S','6','4'));
+}
+
+void osSyncPrintfUnused(const char* fmt, ...)
+{
+    va_list args;
+    va_start(args, fmt);
+
+    _Printf(&is_proutSyncPrintf, NULL, fmt, args);
+}
+
+void osSyncPrintf(const char* fmt, ...)
+{
+    va_list args;
+    va_start(args, fmt);
+
+    _Printf(&is_proutSyncPrintf, NULL, fmt, args);
+}
+
+//assumption
+void rmonPrintf(const char* fmt, ...)
+{
+    va_list args;
+    va_start(args, fmt);
+
+    _Printf(&is_proutSyncPrintf, NULL, fmt, args);
+}
+
+u32 is_proutSyncPrintf(void* arg0, const char *str, s32 count)
+{
+    u32 data;
+    s32 pos;
+    s32 start;
+    s32 end;
+
+    osEPiReadIo(sISVHandle, (u32)&gISVDbgPrnAdrs->magic, &data);
+    if (data != ASCII_TO_U32('I','S','6','4'))
+        return 1;
+    osEPiReadIo(sISVHandle, (u32)&gISVDbgPrnAdrs->get, &data);
+    pos = data;
+    osEPiReadIo(sISVHandle, (u32)&gISVDbgPrnAdrs->put, &data);
+    start = data;
+    end = start + count;
+    if (end >= 0xffe0)
+    {
+        end -= 0xffe0;
+        if (pos < end || start < pos)
+            return 1;
+    }
+    else
+    {
+        if (start < pos && pos < end)
+            return 1;
+    }
+    while (count)
+    {
+        u32 addr = (u32)&gISVDbgPrnAdrs->data + (start & 0xffffffc);
+        s32 shift = ((3 - (start & 3)) * 8);
+        if (*str)
+        {
+            osEPiReadIo(sISVHandle, addr, &data);
+            osEPiWriteIo(sISVHandle, addr, (*str << shift) | (data & ~(0xff << shift)));
+
+            start++;
+            if (start >= 0xffe0)
+                start -= 0xffe0;
+        }
+        count--;
+        str++;
+    }
+    osEPiWriteIo(sISVHandle, (u32)&gISVDbgPrnAdrs->put, start);
+    return 1;
+}
+
+void func_80002384(const char* exp, const char* file, u32 line)
+{
+    osSyncPrintf("File:%s Line:%d  %s \n", file, line, exp);
+    while (true)
+        ;
+}