Here is a list of all files with brief descriptions:

[detail level 1234]

▼ include
► libc
math.h
stdarg.h
stddef.h
stdio.h
stdlib.h
string.h
► PR
abi.h
gbi.h
gs2dex.h
gu.h
libaudio.h
libultra.h
mbi.h
os.h
os_ai.h
os_cache.h
os_cont.h
os_eeprom.h
os_exception.h
os_internal.h
os_libc.h
os_message.h
os_misc.h
os_pi.h
os_rdp.h
os_thread.h
os_time.h
os_tlb.h
os_vi.h
R4300.h
rcp.h
sptask.h
ucode.h
ultratypes.h
actor_types.h
bomb_kart.h
common_structs.h
config.h
course.h
course_offsets.h
debug.h
defines.h
functions.h
global.h
hardcoded_segments.h
kart_attributes.h
macros.h
macros.inc
mk64.h
objects.h
save_data.h
segments.h
sounds.h
trig_tables.h
trig_tables.inc.c
types.h
ultra64.h
variables.h
vehicles.h
waypoints.h
▼ src
► actors
boat.inc.c
falling_rocks.inc.c
train.inc.c
► audio
audio_session_presets.c
data.c
data.h
effects.c
effects.h
external.c
external.h
heap.c
heap.h
internal.h
load.c
load.h
playback.c
playback.h
port_eu.c
port_eu.h
seqplayer.c
seqplayer.h
synthesis.c
synthesis.h
► data
common_textures.inc.c
data_800E45C0.c
data_800E45C0.h
data_800E8700.c
data_800E8700.h
data_segment2.inc.c
framebuffers.c
kart_attributes.inc.c
startup_logo.inc.c
textures.inc.c	Texture data. start in ram 0x801978D0 look like link to code_80091750
► debug
all_variables.h
crash_screen_enhancement.c
crash_screen_enhancement.h
debug.c
debug.inc.c
► ending
camera_junk.c
ceremony_and_credits.c
ceremony_and_credits.h
ceremony_data.inc.c
code_80280000.c
code_80280000.h
code_80281780.c
code_80281780.h
code_80281C40.c
code_80281C40.h
credits.c
credits.h
dl_unk_80284EE0.inc.c
podium_ceremony_actors.c
podium_ceremony_actors.h
► os
► math
cosf.c
llconv.c
llmuldiv.c
sinf.c
__osAiDeviceBusy.c
__osAtomicDec.c
__osDequeueThread.c
__osDevMgrMain.c
__osEPiRawReadIo.c
__osEPiRawWriteIo.c
__osGetCurrFaultedThread.c
__osLeoInterrupt.c
__osPiCreateAccessQueue.c
__osResetGlobalIntMask.c
__osSetGlobalIntMask.c
__osSetHWIntrRoutine.c
__osSiCreateAccessQueue.c
__osSiDeviceBusy.c
__osSiRawReadIo.c
__osSiRawStartDma.c
__osSiRawWriteIo.c
__osSpDeviceBusy.c
__osSpGetStatus.c
__osSpRawStartDma.c
__osSpSetPc.c
__osSpSetStatus.c
__osSyncPutChars.c
__osViGetCurrentContext.c
__osViInit.c
__osViSwapContext.c
_Ldtob.c
_Litob.c
_Printf.c
alBnkfNew.c
bstring.h
contpfs.c
contramread.c
contramwrite.c
controller.h
crc.c
epidma.c
guLookAtF.c
guLookAtRef.c
guMtxCatF.c
guMtxCatL.c
guMtxF2L.c
guNormalize.c
guOrthoF.c
guPerspectiveF.c
guRotateF.c
guScaleF.c
guTranslateF.c
hardware.h
is_debug.c
ldiv.c
leointerrupt.c
libaudio_internal.h
libultra_internal.h
NaN.c
new_func.h
osAi.h
osAiGetLength.c
osAiSetFrequency.c
osAiSetNextBuffer.c
osCartRomInit.c
osContInit.c
osContInternal.h
osContStartReadData.c
osCreateMesgQueue.c
osCreatePiManager.c
osCreateThread.c
osCreateViManager.c
osDestroyThread.c
osEepromLongRead.c
osEepromLongWrite.c
osEepromProbe.c
osEepromRead.c
osEepromWrite.c
osEPiRawStartDma.c
osGetThreadPri.c
osGetTime.c
osInitialize.c
osint.h
osJamMesg.c
osLeoDiskInit.c
osPfsAllocateFile.c
osPfsChecker.c
osPfsDeleteFile.c
osPfsFileState.c
osPfsFreeBlocks.c
osPfsInit.c
osPfsIsPlug.c
osPfsNumFiles.c
osPfsReadWriteFile.c
osPfsSearchFile.c
osPiGetCmdQueue.c
osPiRawReadIo.c
osPiRawStartDma.c
osPiStartDma.c
osRecvMesg.c
osSendMesg.c
osSetEventMesg.c
osSetThreadPri.c
osSetTime.c
osSetTimer.c
osSpTaskLoadGo.c
osSpTaskYield.c
osSpTaskYielded.c
osStartThread.c
osSyncPrintf.c
osTimer.c
osViBlack.c
osViData.c
osVirtualToPhysical.c
osViSetEvent.c
osViSetMode.c
osViSetSpecialFeatures.c
osViSwapBuffer.c
osViTable.c
osYieldThread.c
piint.h
printf.h
sprintf.c
string.c
► racing
actors.c
actors.h
actors_extended.c
actors_extended.h
collision.c
collision.h
math_util.c
math_util.h
memory.c
memory.h
race_logic.c
race_logic.h
render_courses.c
render_courses.h
skybox_and_splitscreen.c
skybox_and_splitscreen.h
camera.c
camera.h
camera_junk.h
code_800029B0.c
code_800029B0.h
code_80004740.c
code_80004740.h
code_80005FD0.c
code_80005FD0.h
code_8001F980.c
code_8001F980.h
code_8003DC40.c
code_8003DC40.h
code_80057C60.c
code_80057C60.h
code_8006E9C0.c
code_8006E9C0.h
code_80071F00.c
code_80071F00.h
code_80086E70.c
code_80086E70.h
code_8008C1D0.c
code_8008C1D0.h
code_80091440.c
code_80091440.h
code_80091750.c
code_80091750.h
code_800AF9B0.c
code_800AF9B0.h
code_800B45E0.c
code_800B45E0.h
common_textures.h
crash_screen.c
crash_screen.h
data_segment2.h
framebuffers.h
gbiMacro.c
hud_renderer.c
hud_renderer.h
kart_dma.c
kart_dma.h
main.c
main.h
math_util_2.c
math_util_2.h
menus.c
menus.h
player_controller.c
player_controller.h
profiler.c
profiler.h
spawn_players.c
spawn_players.h
staff_ghosts.c
staff_ghosts.h
textures.h