diff --git a/.vscode/settings.json b/.vscode/settings.json
index 3e57c050..f9a906b3 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -19,6 +19,7 @@
         "iosfwd": "cpp",
         "sstream": "cpp",
         "tuple": "cpp",
-        "defines.h": "c"
+        "defines.h": "c",
+        "math.h": "c"
     },
 }
\ No newline at end of file
diff --git a/data/ranges.csv b/data/ranges.csv
index 52f9122c..ca06a53f 100644
--- a/data/ranges.csv
+++ b/data/ranges.csv
@@ -2,9 +2,10 @@
 ,,,,,,,,80406540,80406544,,,,,,,,,,,,,,,,,
 80004000,80004380,,,,,80006a8c,80006aa8,,,,,,,,,,,,,,,,,,,sdk/msl/runtime/__mem.o
 ,,,,,,80007214,800079fc,,,,,80406580,80406598,,,,,,,,,,,,,sdk/msl/runtime/runtime.o
+,,,,,,80010574,800105e0,,,,,,,,,,,,,,,,,,,sdk/msl/c/math_double.o
 80004380,800062c0,,,,,,,,,,,,,,,,,,,,,,,,,sdk/trk/__exception.o
 ,,,,,,8001a0b0,8001a2c0,,,,,,,80421da0,80421dd7,,,,,,,,,,,sdk/rvl/base/PPCArch.o
-,,,,,,8001a2c0,8001a45c,,,,,,,,,,,,,8055c778,8055c798,,,,,sdk/rvl/os/OS.o
+,,,,,,8001a2c0,8001a45c,,,,,,,,,,,,,8055c778,8055c7b4,,,,,sdk/rvl/os/OS.o
 ,,,,,,8001c930,8001cf90,,,,,,,80422278,80422400,,,,,,,,,,,sdk/rvl/os/OSCache.o
 ,,,,,,8001cf90,8001d98c,,,,,,,80422400,804225b8,,,,,,,,,,,sdk/rvl/os/OSContext.o
 800062c0,80006620,,,,,,,,,,,,,,,,,,,8055c878,8055c879,,,,,sdk/rvl/os/__start.o
diff --git a/data/symbols.csv b/data/symbols.csv
index 20bf5aaa..efb31d84 100644
--- a/data/symbols.csv
+++ b/data/symbols.csv
@@ -4,6 +4,9 @@ Address,SymbolName
 800079fc,__init_cpp_exceptions
 80007a38,__fini_cpp_exceptions
 8000db3c,strcmp
+80014004,floor
+80014444,sin
+80014588,acos
 80015a14,InitMetroTRK
 80015aac,InitMetroTRK_BBA
 80015d28,__TRKreset
diff --git a/include/dvd.h b/include/dvd.h
index bf784b9c..51ab4480 100644
--- a/include/dvd.h
+++ b/include/dvd.h
@@ -1,11 +1,24 @@
 #pragma once
 
+#include <types.h>
+
 #ifdef __cplusplus
 extern "C" {
 #endif
 
 void DVDInit(void);
 
+/* from libogc */
+typedef struct DVDDiskID {
+  u8 gamename[4];
+  u8 company[2];
+  u8 disknum;
+  u8 gamever;
+  u8 streaming;
+  u8 streambufsize;
+  u8 pad[22];
+} DVDDiskID;
+
 #ifdef __cplusplus
 }
 #endif
\ No newline at end of file
diff --git a/include/math.h b/include/math.h
new file mode 100644
index 00000000..086bb2d7
--- /dev/null
+++ b/include/math.h
@@ -0,0 +1,13 @@
+#pragma once
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+double acos(double x);
+double floor(double x);
+double sin(double x);
+
+#ifdef __cplusplus
+}
+#endif
\ No newline at end of file
diff --git a/include/os.h b/include/os.h
index 4bfeb981..52559783 100644
--- a/include/os.h
+++ b/include/os.h
@@ -1,5 +1,6 @@
 #pragma once
 
+#include <dvd.h>
 #include <types.h>
 
 #ifdef __cplusplus
@@ -30,6 +31,18 @@ typedef struct OSIOSRev {
   u16 year;
 } OSIOSRev;
 
+typedef struct OSBootInfo {
+  DVDDiskID diskId;
+  u32 bootCode;
+  u32 version;
+  u32 physicalMemorySize;
+  u32 boardModel;
+  u32 arenaLo;
+  u32 arenaHi;
+  u32 startOfFST;
+  u32 fstSize;
+} OSBootInfo;
+
 #ifdef __cplusplus
 }
 #endif
\ No newline at end of file
diff --git a/sdk/msl/c/math_double.c b/sdk/msl/c/math_double.c
new file mode 100644
index 00000000..9a3ef45f
--- /dev/null
+++ b/sdk/msl/c/math_double.c
@@ -0,0 +1,6 @@
+#include <defines.h>
+#include <math.h>
+
+USED float acosf(float x) { return (float)acos((double)x); }
+USED float floorf(float x) { return (float)floor((double)x); }
+USED float sinf(float x) { return (float)sin((double)x); }
\ No newline at end of file
diff --git a/sdk/rvl/os/OS.c b/sdk/rvl/os/OS.c
index ef6a586d..6a5fef2a 100644
--- a/sdk/rvl/os/OS.c
+++ b/sdk/rvl/os/OS.c
@@ -8,6 +8,12 @@ USED BOOL __OSInNandBoot = 0;
 USED BOOL __OSIsGcam = 0;
 static f64 ZeroF = 0.0;
 static f32 ZeroPS[2] = {0.0f, 0.0f};
+USED BOOL AreWeInitialized = 0;
+USED void *OSExceptionTable;
+USED char GameNameBuffer[5];
+USED BOOL BI2DebugFlagHolder;
+USED BOOL *BI2DebugFlag;
+USED OSBootInfo *BootInfo;
 
 #ifdef __CWCC__
 
diff --git a/src/bin/buildgen.rs b/src/bin/buildgen.rs
index f8021b6b..22fa0f44 100644
--- a/src/bin/buildgen.rs
+++ b/src/bin/buildgen.rs
@@ -14,6 +14,7 @@ fn parse_hex(s: &str) -> Result<u32, ParseIntError> {
 const SOURCES: &[(&str, &str)] = &[
     ("sdk/msl/runtime/__mem.c", "msl"),
     ("sdk/msl/runtime/runtime.c", "msl"),
+    ("sdk/msl/c/math_double.c", "msl"),
     ("sdk/rvl/base/PPCArch.c", "sdk"),
     ("sdk/rvl/os/OS.c", "sdk"),
     ("sdk/rvl/os/OSCache.c", "sdk"),