Difference between revisions of "Cafe OS"
Marionumber1 (talk | contribs) (→Virtual Memory Map: Clarify location of application code) |
Marionumber1 (talk | contribs) m (→Libraries: Extend nsysnet.rpl's functions) |
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*[[nsyshid.rpl]] - Human Interface Device library | *[[nsyshid.rpl]] - Human Interface Device library | ||
*[[nsyskbd.rpl]] - USB keyboard library | *[[nsyskbd.rpl]] - USB keyboard library | ||
| − | *[[nsysnet.rpl]] - BSD sockets | + | *[[nsysnet.rpl]] - BSD sockets, network configuration, and SSL |
*[[nsysuhs.rpl]] - Low-level USB access | *[[nsysuhs.rpl]] - Low-level USB access | ||
*[[nsysuvd.rpl]] | *[[nsysuvd.rpl]] | ||
Revision as of 17:30, 14 September 2015
Cafe OS is the operating system running on the PowerPC in Wii U mode. It consists of the Cafe OS kernel, the executable loader, and system libraries. Unlike on the Wii, where games ran with full hardware access, Wii U applications run under the supervision of the kernel, isolating them from each other. All applications are modified ELFs, as are the libraries themselves, and applications dynamically link with them to gain access to OS services. Cafe OS also contains a few system processes, like the home menu and error handler.
Architecture
Kernel
The kernel runs in supervisor mode on the PowerPC, and performs the basic tasks of a microkernel. It is responsible for process isolation, memory management, and interrupt dispatching, as well as communication with IOSU. Cafe OS applications run as user mode processes, with separate address spaces and W^X memory protection. The kernel provides basic syscalls for running processes.
Loader
The loader is responsible for loading RPL formatted libraries and executables into memory. It is a standard ELF executable named loader.elf. It includes a statically linked copy of zlib, probably for decompressing sections of RPL files.
Libraries
Cafe OS applications dynamically link with system libraries to get access to OS services. These OS services include memory management, graphics, audio, and controller input. All libraries are RPL files, a modification of the standard ELF format with compressed sections and more Windows-like dynamic linking. The main system libraries are listed below, with some having their own pages of documentation:
- avm.rpl - Audio/Video Manager
- camera.rpl - Gamepad camera
- coreinit.rpl - Kernel, memory, and FS
- dc.rpl - Display Controller
- dmae.rpl - DMA (Direct Memory Access)
- drmapp.rpl - Digital Rights Management
- erreula.rpl - Error Viewer
- gx2.rpl - Graphics
- h264.rpl - Support for H.264
- lzma920.rpl - LZMA compression
- mic.rpl - Gamepad microphone
- nfc.rpl - Low-level NFC library
- nio_prof.rpl - IO Profiler
- nlibcurl.rpl - libcurl 7.21.7, functions match official library, has extra options for curl_easy_setopt
- nlibnss.rpl - libnss
- nlibnss2.rpl
- nn_ac.rpl - Nintendo Network Auto Connection
- nn_acp.rpl - Nintendo Network Account/Access Protection
- nn_act.rpl - Nintendo Network Accounts
- nn_aoc.rpl - Nintendo Network Add-On Content
- nn_boss.rpl - Nintendo Network BOSS (Streetpass)
- nn_ccr.rpl
- nn_cmpt.rpl - Nintendo Network Compatibility ???
- nn_ec.rpl - Nintendo Network E-Commerce
- nn_fp.rpl - Nintendo Network Friend Presence
- nn_hai.rpl
- nn_hpad.rpl - Something related to controllers
- nn_idbe.rpl - Downloads and decrypts game icons from an online icon database
- nn_ndm.rpl - Daemons???
- nn_nets2.rpl - More network functions
- nn_nfp.rpl - Nintendo Network Nintendo Figurine Platform (Amiibo)
- nn_nim.rpl
- nn_olv.rpl - Olive/OLV - Miiverse
- nn_pdm.rpl - System Play related data (play times etc.)
- nn_save.rpl - Savefile access
- nn_sl.rpl
- nn_spm.rpl - Storage related functions (USB?)
- nn_temp.rpl - TEMP library (for temporary files)
- nn_uds.rpl - UDS/Local Connection library
- nn_vctl.rpl
- nsysccr.rpl - DRH communication (input and RPC)
- nsyshid.rpl - Human Interface Device library
- nsyskbd.rpl - USB keyboard library
- nsysnet.rpl - BSD sockets, network configuration, and SSL
- nsysuhs.rpl - Low-level USB access
- nsysuvd.rpl
- ntag.rpl - NTAG high level NFC library
- padscore.rpl - Wii Remote and Balance Board
- proc_ui.rpl
- snd_core.rpl
- snd_user.rpl
- sndcore2.rpl
- snduser2.rpl
- swkbd.rpl - Onscreen keyboard
- sysapp.rpl
- tcl.rpl - Texture Core library
- tve.rpl - TV Engine
- uac.rpl - DRH communication (Gamepad microphone)
- uac_rpl.rpl
- usb_mic.rpl
- uvc.rpl - DRH communication (Gamepad camera)
- uvd.rpl - AMD's OpenVideo Decode library, with some different function names
- vpad.rpl - Gamepad input
- vpadbase.rpl - Gamepad base library
- zlib125.rpl - ZLIB 1.2.5, functions match official library
Virtual Memory Map
- 0x01000000 - 0x01800000 Loader and system libraries
- 0x0??????? - 0x10000000 App executable and libraries (start varies, but end is always 0x10000000)
- 0x10000000 - 0x50000000 Application/library data area (may be smaller)
- 0xa0000000 - 0xe0000000 Overlay of application memory (used by loader?)
- 0xe0000000 - 0xe4000000 Some sort of hardware communication area
- 0xefe00000 - 0xefe80000 Loader data area (only mapped when running loader)
- 0xf4000000 - 0xf6000000 MEM1
- 0xf6000000 - 0xf6800000 Unknown
- 0xf8000000 - 0xfb000000 Read-only shared data (system fonts mostly)
- 0xfc000000 - 0xfc0c0000 Processor Interface
- 0xfc200000 - 0xfc280000 GX2 TCL registers
- 0xfc280000 - 0xfc2a0000 DSP registers
- 0xfc2a0000 - 0xfc2c0000 GX2 FIFO space? (Radeon PKT3 sent here)
- 0xfc320000 - 0xfd000000 Espresso OTP (and other stuff?)
- 0xfd000000 - 0xfd?????? Latte registers
- 0xfd040250 - 0xfd046c00 I2C registers
- 0xfd046e00 - 0xfd060520 AI registers?
- 0xff200000 - 0xff280000 Kernel heap
- 0xffe00000 - 0xfff20000 Kernel ancast image
- 0xffffffe0(?) - 0xfffffffc(?) Per-thread data (e.g. pointer to thread descriptor and thread queue)