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Below compiled SDK 0x04000000 the call writes sceGnmDrawInitToDefaultContextState's 19 words again, now that a run of firmware 13.42's module found them byte-identical. The test pins the 19 words as literals.
22 lines
6.9 KiB
Markdown
22 lines
6.9 KiB
Markdown
# libSceGnmDriverForNeoMode technical debt
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### Unknown function info
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- [sceGnmDingDongForWorkload, sceGnmRegisterOwner](../../../core/libs/prx/libSceGnmDriverForNeoMode/Export.cpp) - the first throws through `NotImplemented_nid_no_patch` and `sceGnmRegisterOwner` returns `Failure` (0x8EEE00FF) without registering anything; behaviour and the PS5 prototypes are unmeasured. The only source of the parameter lists is shadPS4's PS4-derived prototypes (GPLv2, used as a reference only), with no second reference; structure pointers are `void*` because no layout is known.
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- [libSceGnmDriverForNeoMode pending exports](../../../core/libs/prx/libSceGnmDriverForNeoMode/Export.cpp) - 34 named callable exports are listed in the [PS5 3.20 export table](https://github.com/DNNDHH/PS5-3.20_Libs/blob/b2a77c09cd71c01f34c790cfbe98c751a13262ad/libSceGnmDriverForNeoMode.c) and were cross-checked against the same module in PS5 firmware 13.60. Their signatures and behaviour are unverified; the declarations use the no-parameter unknown-signature convention and throw through `NotImplemented_nid_no_patch`.
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### Functional
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- [retail-only answers](../../../core/libs/prx/libSceGnmDriverForNeoMode/Export.cpp) (libSceGnmDriverForNeoMode) - the debug resets, the resource and owner registration calls, the SDMA calls and the SQ counter calls return `0x8EEE00FF`, the five `sceGnmDriverInternalRetrieveGnmInterface*` calls return `0x80000000`, `sceGnmGetDbgGcHandle` returns -1, `sceGnmDriverTraceInProgress` and `sceGnmValidateOnSubmitEnabled` return 0 and the other validation calls return `0x80D13FFF`. These are the values [shadPS4](https://github.com/shadps4-emu/shadPS4/blob/a808e76/src/core/libraries/gnmdriver/gnmdriver.cpp) returns for calls it marks as not available in retail firmware; they are not measured on a console, and the arguments are not read
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- [default state packets](../../../core/libs/prx/libSceGnmDriverForNeoMode/Export.cpp) (libSceGnmDriverForNeoMode) - `sceGnmDrawInitDefaultHardwareState`, `sceGnmDrawInitDefaultHardwareState200`, `sceGnmDrawInitDefaultHardwareState350`, `sceGnmDrawInitToDefaultContextState` and `sceGnmDrawInitToDefaultContextState400` write the sequences in [InitSequences.hpp](../../../core/libs/prx/libSceGnmDriverForNeoMode/include/InitSequences.hpp), taken from [shadPS4's gnmdriver_init.h](https://github.com/shadps4-emu/shadPS4/blob/a808e76/src/core/libraries/gnmdriver/gnmdriver_init.h): its Neo sequences, except the plain hardware state, which shadPS4 also writes unchanged in Neo mode. The size checks and returned sizes are shadPS4's. Not compared with console output, and nothing in AnyPS5 consumes a GNM command buffer yet
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- [sceGnmDrawInitToDefaultContextStateInternalCommand](../../../core/libs/prx/libSceGnmDriverForNeoMode/Export.cpp) (libSceGnmDriverForNeoMode) - answers as `sceGnmDrawInitToDefaultContextState` when the compiled SDK version in the process parameters is below 0x04000000 and as `sceGnmDrawInitToDefaultContextState400` from it, as firmware 13.42's module does, run natively with its imports stubbed, not on a console. The module reads the version at init through `sceKernelGetCompiledSdkVersion`. From 0x04000000 its result and output equal `...State400` for every size tried ([run](https://github.com/boykopovar/AnyPS5/pull/10701#issuecomment-6403613914)). Below it, size 0x20 writes 19 words byte-identical to the module's own `sceGnmDrawInitToDefaultContextState`, from a copy of that sequence, and other sizes write nothing ([@BunnyFl's comparison](https://github.com/boykopovar/AnyPS5/pull/13712#issuecomment-6543609746)). The version is read at each call here, not cached at init
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- [draw, dispatch, wait and VGT packets](../../../core/libs/prx/libSceGnmDriverForNeoMode/Export.cpp) (libSceGnmDriverForNeoMode) - the signatures, size checks, PM4 words and refusals (-1) of the 17 command writers follow [shadPS4](https://github.com/shadps4-emu/shadPS4/blob/a808e76/src/core/libraries/gnmdriver/gnmdriver.cpp) on its Neo-mode path, since this module is the Neo-mode driver: draw initiators keep flag bits 29 to 31, and `sceGnmSetVgtControl` and `sceGnmResetVgtControl` write `IA_MULTI_VGT_PARAM` through `SET_UCONFIG_REG` (shadPS4's `UseNeoCompatSequences` is false). The packets are not compared with console output, and nothing in AnyPS5 consumes a GNM command buffer yet
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- [embedded shaders](../../../core/libs/prx/libSceGnmDriverForNeoMode/Export.cpp) (libSceGnmDriverForNeoMode) - `sceGnmSetEmbeddedVsShader` (id 0, a fullscreen triangle) and `sceGnmSetEmbeddedPsShader` (id 0 writes black, id 1 exports depth only) write the register packets of [shadPS4](https://github.com/shadps4-emu/shadPS4/blob/a808e76/src/core/libraries/gnmdriver/gnmdriver.cpp), pointing at the shader code in [EmbeddedShaders.hpp](../../../core/libs/prx/libSceGnmDriverForNeoMode/include/EmbeddedShaders.hpp) in this module's memory instead of the console's `0xfe000f00` area. That code is shadPS4's instruction listing assembled with LLVM 19 `llvm-mc -arch=amdgcn -mcpu=bonaire`, without the binary header and register block that follow it on the console, since nothing here reads them; another id returns `0x8EEE00FF`. The size and modifier arguments are not checked, as in shadPS4. Not compared with console output, and nothing in AnyPS5 consumes a GNM command buffer yet
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- [shader register packets](../../../core/libs/prx/libSceGnmDriverForNeoMode/Export.cpp) (libSceGnmDriverForNeoMode) - `sceGnmUpdateVsShader`, `sceGnmUpdatePsShader`, `sceGnmUpdatePsShader350`, `sceGnmSetPsShader350`, `sceGnmUpdateGsShader`, `sceGnmUpdateHsShader` and `sceGnmSetCsShaderWithModifier` write the packets, size checks and -1 refusals of [shadPS4](https://github.com/shadps4-emu/shadPS4/blob/a808e76/src/core/libraries/gnmdriver/gnmdriver.cpp); the update forms carry context registers inside NOP packets as there. Not compared with console output, and nothing in AnyPS5 consumes a GNM command buffer yet
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- [workloads](../../../core/libs/prx/libSceGnmDriverForNeoMode/Export.cpp) (libSceGnmDriverForNeoMode) - `sceGnmCreateWorkloadStream`, `sceGnmBeginWorkload` and `sceGnmEndWorkload` return shadPS4's values (3 for a null output or name, 1 for a stream above 15, 2 for workload 0 or one with a top byte above 15) and keep no state; not measured on a console
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- [sceGnmGetGpuCoreClockFrequency](../../../core/libs/prx/libSceGnmDriverForNeoMode/Export.cpp) (libSceGnmDriverForNeoMode) - returns 911 MHz, shadPS4's Neo-mode value, which it derives from Neo mode instead of the console's ioctl. `sceGnmGetOffChipTessellationBufferSize` returns shadPS4's `0x800000`
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### Additional callable exports
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- [Additional callable exports](../../../core/libs/prx/libSceGnmDriverForNeoMode/Export.cpp) - 20 callable NIDs are present in both version-labelled images. Both images also export these NIDs from the distinct normal Gnm provider; matching NIDs do not establish behavioral equivalence. Future declarations or implementations in that provider require loader analysis. Image labels are not authenticated. Names, signatures and behavior are unverified; each declaration throws.
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