Editing Talk:PS2 Emulation
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===ps2_netemu command 0x12=== | ===ps2_netemu command 0x12=== | ||
First 8 bytes of that command are special flags. Not quite sure about bytes 5-8 yet, because at some point they are used to "andc" with first 4 bytes. | |||
Some examples for first 4 bytes: | |||
0x100000 = Different code path for VU0 opcodes that do ADD/SUB with multiply (MSUB, MADDA, etc.). | |||
0x200000 = Run some additional code in VU0 load/store opcodes (ILW, LQI, ISWR, etc.) | |||
0x400000 = Skip emu syscall 3 (3) | |||
0x800000 = Skip emu syscall 3 (4) | |||
0x4000000 = This flag ensure that type 2 config from cmd 0x12 will run. Otherwise it seems to be skipped. | |||
0x8000000 = Run some additional code for VU0 DIV opcode | |||
0x30000000 = Different code path for VU0 MUL opcodes, include opcodes like MSUB for mul part. So 0x30100000 work for mul, and sub part. | |||
0x10000000 and 0x20000000 also work for that purpose, emu just check for any active bits after applying 0x30000000 mask. | |||
Keep in mind that you still need to use at least 8 bytes for cmd 0x12, just use 00 for bytes 5,6,7,8. | |||
Syscall 3 - Enable additional code related to VU0/COP2 | |||
*param = 3 Patch 0x186C10 to NOP | |||
*param = 4 Patch 0x186C40 to NOP | |||
*param = anything else LV1 panic | |||
* Do the VU0 accuracy flags need any subcommands? Official 0x12 configs for the State of Emergency/Driving Emotion/The Getaway use 0x00021000 0x00000000 flag.--[[User:Agrippa|Agrippa]] ([[User talk:Agrippa|talk]]) 15:43, 9 March 2022 (UTC) | |||
** Flags are first 2 x 4 bytes of cmd 0x12. Config need at least 8 bytes, or it is ignored. There is no need for any subcommand. I suggest to not mess with second 4 bytes for now, and just use 00 00 00 00 as i'm not sure what is real usage of that yet (seems to be "disabler" mask for first 4 bytes, so they are use only one time). For now most aggressive config that use flags is Marvel Nemesis. After excluding 0x4000000 which trigger type 2 subcmd, config looks like this 00FFF000 00000000. --[[User:Kozarovv|Kozarovv]] ([[User talk:Kozarovv|talk]]) 05:42, 10 March 2022 (UTC) | |||
====type 1==== | ====type 1==== | ||
Playground discussion, unsure about clrlslwi r11, r0, 16,3 result | Playground discussion, unsure about clrlslwi r11, r0, 16,3 result |