diff --git a/functions.py b/functions.py
index b78d189602..5519bb5ae9 100644
--- a/functions.py
+++ b/functions.py
@@ -29,6 +29,9 @@ known_funcs = {
     0x8008189C:("func_8008189C","void","void"),
     0x800818D0:("func_800818D0","void","void"),
     0x800818F4:("func_800818F4","void","void"),
+    0x80081920:("func_80081920","void","UNK_TYPE, UNK_TYPE, UNK_TYPE, UNK_TYPE"),
+    0x8008193C:("func_8008193C","void","UNK_TYPE, UNK_TYPE, UNK_TYPE, UNK_TYPE"),
+    0x80081958:("func_80081958","void","UNK_TYPE, UNK_TYPE, UNK_TYPE, UNK_TYPE"),
     0x800819F0:("func_800819F0","UNK_RET","UNK_PTR, void(*)(UNK_TYPE, UNK_TYPE), UNK_TYPE, UNK_TYPE"),
     0x80081AD4:("func_80081AD4","UNK_RET","UNK_PTR"),
     0x80081BCC:("func_80081BCC","UNK_RET","UNK_PTR, UNK_TYPE(*)(UNK_TYPE, UNK_TYPE), UNK_TYPE"),
diff --git a/include/functions.h b/include/functions.h
index 117d851fd1..2e334a88e9 100644
--- a/include/functions.h
+++ b/include/functions.h
@@ -58,7 +58,9 @@ void func_80081830(void); // func_80081830
 void func_8008189C(void); // func_8008189C
 void func_800818D0(void); // func_800818D0
 void func_800818F4(void); // func_800818F4
-// UNK_RET func_8008193C(UNK_ARGS);
+void func_80081920(UNK_TYPE, UNK_TYPE, UNK_TYPE, UNK_TYPE); // func_80081920
+void func_8008193C(UNK_TYPE, UNK_TYPE, UNK_TYPE, UNK_TYPE); // func_8008193C
+void func_80081958(UNK_TYPE, UNK_TYPE, UNK_TYPE, UNK_TYPE); // func_80081958
 // UNK_RET func_80081980(UNK_ARGS);
 UNK_RET func_800819F0(UNK_PTR, void(*)(UNK_TYPE, UNK_TYPE), UNK_TYPE, UNK_TYPE); // func_800819F0
 UNK_RET func_80081AD4(UNK_PTR); // func_80081AD4
diff --git a/src/boot/boot_0x80081920.c b/src/boot/boot_0x80081920.c
new file mode 100644
index 0000000000..30047e6e7d
--- /dev/null
+++ b/src/boot/boot_0x80081920.c
@@ -0,0 +1,7 @@
+#include <ultra64.h>
+#include <global.h>
+
+// TODO what are these updating the sp even though they call no other functions?
+void func_80081920(UNK_TYPE a0, UNK_TYPE a1, UNK_TYPE a2, UNK_TYPE a3) {}
+void func_8008193C(UNK_TYPE a0, UNK_TYPE a1, UNK_TYPE a2, UNK_TYPE a3) {}
+void func_80081958(UNK_TYPE a0, UNK_TYPE a1, UNK_TYPE a2, UNK_TYPE a3) {}