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−== Syscalls ==+Cafe OS syscalls are issued by doing the following:
− li r0, 0x0100 # load syscall value->r0
− sc # syscall instruction
− blr # return control to program
−
−When you send a call to the kernel, it goes to 0xFFF00C00, which then jumps to 0xFFF021A0 + (fastcall << 5).
−
−Normal syscalls are divisible by 0x100, so all of them will jump to 0xFFF0021A0 itself, which is a jump to the table dispatcher.
−
−The dispatcher uses a RAMPID and the syscall dispatch tables at 0xFFEAAA40 (user table in 5.5.1) and 0xFFE84850 (loader table in 5.5.1) to get the secondary table each RAMPID is able to access.
−
−RAMPIDs 0 (Kernel), 2, and 3 all use an empty table, while RAMPID 1 (root.rpx) has its own table with a few unique calls. RAMPIDs 4 (background app), 5 (home menu), and 6 (error display) share the same table and RAMPID 7 (foreground app) has it's own. See [[Cafe OS#Processes|Cafe OS]] wiki page for more info.
−
−Below is a list of what all of them, as well as the loader which has its own bare-bones table, have access to call. (sp) indicates that the loader uses a separate function for that syscall. Additionally, the loader uses the same function for IPCKDriver_Open/Close.
−
−{| class="wikitable sortable"
−|-
−! scope="col" | #
−! scope="col" | Name
−! scope="col" style="width: 24px;" | root
−! scope="col" style="width: 24px;" | Sys
−! scope="col" style="width: 24px;" | App
−! scope="col" style="width: 24px;" | Ldr
−|-
−| 0x0000 || ConsoleWrite || X || X || X || X (sp)
−|-
−| 0x0100 || AppPanic || X || X || X || X
−|-
−| 0x0200 || EffectiveToPhysical || X || X || X ||
−|-
−| 0x0300 || PhysicalToEffectiveCached || X || X || X ||
−|-
−| 0x0400 || PhysicalToEffectiveUncached || X || X || X ||
−|-
−| 0x0500 || ValidateAddrRange || X || X || X || X
−|-
−| 0x0600 || UpdateCoreTime || X || X || X ||
−|-
−| 0x0800 || SetUserModeExHandler || X || X || X ||
−|-
−| 0x0B00 || AllocateTimer || X || X || X ||
−|-
−| 0x0C00 || FreeTimer || X || X || X ||
−|-
−| 0x0D00 || PrimeTimer || X || X || X ||
−|-
−| 0x0E00 || StopTimer || X || X || X ||
−|-
−| 0x0F00 || DumpModuleList || X || X || X ||
−|-
−| 0x1000 || SetInterruptHandler || X || X || X ||
−|-
−| 0x1100 || GetInterruptHandler || X || X || X ||
−|-
−| 0x1200 || DisableInterrupt || X || X || X ||
−|-
−| 0x1300 || EnableInterrupt || X || X || X ||
−|-
−| 0x1400 || ClearAndEnableInterrupt || X || X || X ||
−|-
−| 0x1500 || GetInterruptStatus || X || X || X ||
−|-
−| 0x1600 || ClearInterruptStatus || X || X || X ||
−|-
−| 0x1700 || FindClosestSymbol || X || X || X || X (sp)
−|-
−| 0x1900 || Exit/Halt || X || X || X ||
−|-
−| 0x1A00 || GetInfo || X || X || X ||
−|-
−| 0x1B00 || SetInfo || X || X || X ||
−|-
−| 0x1C00 || ReleaseCore || X || X || X ||
−|-
−| 0x1D00 || SendICI || X || X || X ||
−|-
−| 0x1E00 || IPCKDriver_<nowiki>{Loader|User}</nowiki>Open || X || X || X || X (sp)
−|-
−| 0x1F00 || IPCKDriver_<nowiki>{Loader|User}</nowiki>Close || X || X || X || X (sp)
−|-
−| 0x2000 || IPCKDriver_SubmitRequest || X || X || X || X (sp)
−|-
−| 0x2200 || GetEnvironmentVariable || X || X || X ||
−|-
−| 0x2700 || GetNotifyTarget || X || X || X ||
−|-
−| 0x2800 || ReleaseForeground || X || X || X ||
−|-
−| 0x2900 || GetForegroundBucket || X || X || X ||
−|-
−| 0x2A00 || RequestSwitch || X || X || X ||
−|-
−| 0x2B00 || LaunchTitleArgvStr || X || X || X ||
−|-
−| 0x2C00 || ProcYield || X || X || X ||
−|-
−| 0x2E00 || GetSystemMessage || X || X || X ||
−|-
−| 0x2F00 || GetCallArgs || X || X || X ||
−|-
−| 0x3000 || GetAbsoluteSystemTimeInternal || X || X || X ||
−|-
−| 0x3100 || SetAbsoluteSystemTimeInternal || X || X || X ||
−|-
−| 0x3200 || Driver_Register || X || X || X ||
−|-
−| 0x3300 || Driver_Deregister || X || X || X ||
−|-
−| 0x3800 || AllocVirtAddr || X || X || X ||
−|-
−| 0x3900 || FreeVirtAddr || X || X || X ||
−|-
−| 0x3A00 || GetMapVirtAddrRange || X || X || X ||
−|-
−| 0x3B00 || GetDataPhysAddrRange || X || X || X ||
−|-
−| 0x3C00 || GetAvailPhysAddrRange || X || X || X ||
−|-
−| 0x3D00 || MapMemory || X || X || X ||
−|-
−| 0x3E00 || UnmapMemory || X || X || X ||
−|-
−| 0x3F00 || LogBuffer || X || X || X || X
−|-
−| 0x4000 || LogArgs || X || X || X || X
−|-
−| 0x4100 || LogFunc || X || X || X || X
−|-
−| 0x4200 || LogReportKernel || X || X || X || X
−|-
−| 0x4300 || LogRetrieve || X || X || X || X
−|-
−| 0x4400 || (unknown) || X || X || X ||
−|-
−| 0x4500 || (unknown) || X || X || X ||
−|-
−| 0x4600 || save_fpu || X || X || X ||
−|-
−| 0x4700 || Driver_CopyFromSaveArea || X || X || X ||
−|-
−| 0x4800 || Driver_CopyToSaveArea || X || X || X ||
−|-
−| 0x4900 || SavesDone_ReadyToRelease || X || X || X ||
−|-
−| 0x4A00 || SetAlarm || X || X || X ||
−|-
−| 0x4B00 || SetDABR || X || X || X ||
−|-
−| 0x4C00 || SetIABR || X || X || X ||
−|-
−| 0x4D00 || GetProcessInfo || X || X || X ||
−|-
−| 0x4E00 || GetCodegenVirtAddrRange || X || X || X ||
−|-
−| 0x4F00 || LoaderCall || X || X || X ||
−|-
−| 0x5000 || RPLLoaderResumeContext || || || || X
−|-
−| 0x5200 || WaitIopComplete || || || || X
−|-
−| 0x5300 || FlushCode || || || || X
−|-
−| 0x5400 || FlushData || || || || X
−|-
−| 0x5500 || UpdateHeartbeat || || || || X
−|-
−| 0x5600 || LogEntry || || || || X
−|-
−| 0x5700 || FastClearMemory || || || || X
−|-
−| 0x5800 || GetBusClockSpeed || || || || X
−|-
−| 0x5900 || GetSharedArea || X || X || X ||
−|-
−| 0x5A00 || SendPolicy || X || X || X ||
−|-
−| 0x5B00 || GetProcessIndex || || || || X
−|-
−| 0x5C00 || IPCKDriver_PollLoaderCompletion || || || || X
−|-
−| 0x5D00 || BlockLogSave || X || X || X ||
−|-
−| 0x5E00 || FinishInitandPreload || || || || X
−|-
−| 0x5F00 || ContinueStartProcess || || || || X
−|-
−| 0x6000 || OpenMCP || || || || X
−|-
−| 0x6100 || QuerySwitchReady || X || X || X ||
−|-
−| 0x6200 || launch_title || X || X || X ||
−|-
−| 0x6300 || call_title || X || X || X ||
−|-
−| 0x6400 || SetTimeInternal || || X || ||
−|-
−| 0x6500 || do_nothing (blr) || X || X || X ||
−|-
−| 0x6600 || ProfileEntry (blr) || || || || X
−|-
−| 0x6700 || RequestFastExit || X || X || X ||
−|-
−| 0x6800 || CoreInitDone || X || X || X ||
−|-
−| 0x6900 || GetSwitchTarget || X || X || X ||
−|-
−| 0x6A00 || AcquireDone || X || X || X ||
−|-
−| 0x6B00 || GetBuiltSDKVersion || X || X || X ||
−|-
−| 0x6C00 || SystemFatal || X || X || X ||
−|-
−| 0x6E00 || SwitchSecCodeGenMode || X || X || X ||
−|-
−| 0x6F00 || IopShell_RegisterCallback || X || X || X ||
−|-
−| 0x7000 || GetTitleVersion || X || X || X ||
−|-
−| 0x7100 || IsTestKernel || X || X || X ||
−|-
−| 0x7200 || ForceFullRelaunch || X || X || X ||
−|-
−| 0x7300 || Recycle || X || || ||
−|-
−| 0x7400 || get_mode_flags || X || X || X || X
−|-
−| 0x7500 || QueryVirtAddr || X || X || X ||
−|-
−| 0x7600 || GetCodegenCore || X || X || X ||
−|-
−| 0x7700 || GetSecCodeGenMode || X || X || X ||
−|-
−| 0x7800 || CodegenCopy || X || X || X ||
−|-
−| 0x7900 || LoadShared || X || || ||
−|-
−| 0x7A00 || SetExceptionCallback || X || X || X ||
−|-
−| 0x7B00 || IopShell_InjectCommand || X || X || X ||
−|-
−| 0x7C00 || Kill || X || X || X ||
−|-
−| 0x7D00 || EnableOverlayArena || X || X || X ||
−|-
−| 0x7E00 || DisableOverlayArena || X || X || X ||
−|-
−| 0x7F00 || GetSystemMode || X || X || X ||
−|-
−| 0x8000 || SystemMode_RegisterCallback || X || X || X ||
−|-
−| 0x8100 || ZeroProcessMemory || X || || ||
−|-
−| 0x8200 || HandleIopPowerEvents || || || || X
−|-
−| 0x8300 || ConsoleTimestamp || X || X || X || X
−|-
−| 0x8400 || ValidateOverlayRange || || || || X
−|-
−| 0x8500 || BadSysCall (jump to null on purpose) || X || X || X || X
−|}
−
−== Fastcalls ==
−Fastcalls, on the other hand, are system calls that aren't routed through the dispatcher and can be accessed by any RAMPID.
−Attempting to access an unimplemented fastcall will redirect the code flow to syscall 0x0100 (AppPanic).
−
−Below is a list of all the currently supported fastcalls.
−
−{| class="wikitable sortable"
−|-
−! scope="col" | #
−! scope="col" | Name
−|-
−| 0x0000 || (default branch to syscall dispatcher)
−|-
−| 0x0001 || SyncEIEIO
−|-
−| 0x0006 || LoadContext
−|-
−| 0x0007 || SaveContext
−|-
−| 0x0008 || SetCurrentContext
−|-
−| 0x0009 || GetCurrentFPUContext
−|-
−| 0x000A || SetCurrentFPUContext
−|-
−| 0x000B || CompareAndSwapCurrentFPUContext
−|-
−| 0x000C || WriteGatherInit
−|-
−| 0x000D || SetPerformanceMonitor
−|-
−| 0x000E || FlushDMAQueue
−|-
−| 0x000F || do_nothing (rfi)
−|-
−| 0x0010 || DisableFPU (???)
−|-
−| 0x0011 || ReadRegister32Ex
−|-
−| 0x0012 || WriteRegister32Ex
−|-
−| 0x0013 || Unknown (FPU?)
−|-
−| 0x0014 || Unknown (FPU?)
−|-
−| 0x0015 || Unknown (FPU?)
−|-
−| 0x0016 || Unknown (FPU?)
−|-
−| 0x0017 || WriteGatherGetPtr
−|-
−| 0x0018 || EnableFPU (???)
−|-
−| 0x0019 || GetSecurityLevel (always zero)
−|-
−| 0x001A || BadFastCall (jump to error on purpose)
−|}
#REDIRECT [[Cafe OS]]
−