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Nintendo 64 - Nintendo Switch Online (view source)
Revision as of 16:54, 1 February 2022
, 16:54, 1 February 2022no edit summary
= Details =
= Details =
Like [[Super_Mario_3D_All-Stars#SuperMario64|SM3DAS]], this uses [[JIT_services|JIT]] for running the emulated executable. The game archives also contains an AOT NRO. A NRO does get loaded, however actual usage is currently not enabled. When the emu PC physical address is not located in DRAM (code prior to this will handle triggering a N64 exception if the PC vaddr is invalid), the code is interpreted instead of using JIT, with the code instruction being loaded with n64MemDefaultRead32 (handler funcptr is called from a table, mem-access with these use the non-WithDestLog funcs. TLB validation is done by those funcs before mem-access, triggering a N64 exception if needed). Patches are applied at runtime with the config/lua files from the game archives.
Like [[Super_Mario_3D_All-Stars#SuperMario64|SM3DAS]], this uses [[JIT_services|JIT]] for running the emulated executable. The game archives also contains an AOT NRO. A NRO does get loaded, however actual usage is currently not enabled. When the emu PC physical address is not located in DRAM (code prior to this will handle triggering a N64 exception if the PC vaddr is invalid), the code is interpreted instead of using JIT, with the code instruction being loaded with n64MemDefaultRead32 (handler funcptr is called from a table, mem-access with these use the non-WithDestLog funcs. TLB validation is done by those funcs before mem-access, triggering a N64 exception if needed). Patches are applied at runtime with the config/lua files from the game archives.
TLB validation for mem-access done by JIT'd code is only done if the corresponding flag in "g_nN64CpuCmpTLBCheckLevel" is set, see below. There are currently no games which set this config. Note that the various Read/Write funcs will do nothing if the specified address is invalid, with 0 being returned for the Read funcs.
A maximum of 0x1000-bytes are loaded from the [[Applet_Manager_services#PopLaunchParameter|launch-parameter]], with buf[read_size]=0. Hence, this is a string. When available, this seems to be used to select which game to launch.
A maximum of 0x1000-bytes are loaded from the [[Applet_Manager_services#PopLaunchParameter|launch-parameter]], with buf[read_size]=0. Hence, this is a string. When available, this seems to be used to select which game to launch.
Flags defaults to 0. If config for "NoRunTime" is value 1, flags bit0 is set.
Flags defaults to 0. If config for "NoRunTime" is value 1, flags bit0 is set.
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| 0xDF8 || 0x4 || Set to 0 by default, then if available the emulator sets bit flags here depending on the content of the config for <code>"Cmp", "g_nN64CpuCmpTLBCheckLevel"</code>.
| 0xDF8 || 0x4 || Set to 0 by default, then if available the emulator sets bit flags here depending on the content of the config for <code>"Cmp", "g_nN64CpuCmpTLBCheckLevel"</code>. Each bit corresponds to a mem-access instruction, when handling an instruction with a bit set TLB validation is done by generating code which calls the funcptr at controldata+0x710.
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| 0xDFC || 0x4 || Set to 0 by default by the emulator. With config <code>"Cmp", "CodeMultiAddr"</code> this is set to 1. Config <code>"Cmp", "BlockDynamicPC"</code> from [[Super_Mario_3D_All-Stars|SM3DAS]] is not supported. The plugin doesn't use this field, since support for "BlockDynamicPC" was removed. All code which used to use this now assumes val!=2, with code for ==2 being removed.
| 0xDFC || 0x4 || Set to 0 by default by the emulator. With config <code>"Cmp", "CodeMultiAddr"</code> this is set to 1. Config <code>"Cmp", "BlockDynamicPC"</code> from [[Super_Mario_3D_All-Stars|SM3DAS]] is not supported. The plugin doesn't use this field, since support for "BlockDynamicPC" was removed. All code which used to use this now assumes val!=2, with code for ==2 being removed.