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BS2Emu: Set HID0/1/2/4 and MSR with correct default values

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These values were obtained by setting a breakpoint at a game's entry point, and then observing the register values with Dolphin's register widget.

There are other registers that aren't handled by this PR, including CR, XER, SRR0, SRR1, and "Int Mask" (as well as most of the GPRs). They could be added in a later PR if it turns out that their values matter, but probably most of them don't.

This fixes Datel titles booting with the IPL skipped (see https://bugs.dolphin-emu.org/issues/8223), though when booted this way they are currently missing textures. Due to somewhat janky code, Datel overwrites the syscall interrupt handler and then immediately triggers it (with the `sc` instruction) before they restore the correct one. This works on real hardware due to icache, and also works in Dolphin when the IPL runs due to icache, but prior to this change `HID0.ICE` defaulted to 0 so icache was not enabled when the IPL was skipped.
This commit is contained in:
Pokechu22
2022-06-12 22:27:42 -07:00
parent 6173ba1d9c
commit b2ddffeeb1
3 changed files with 40 additions and 5 deletions
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4
Source/Core/Core/Boot/Boot.cpp
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@ -538,14 +538,12 @@ bool CBoot::BootUp(std::unique_ptr<BootParameters> boot)
SetDefaultDisc();
SetupMSR();
SetupHID(config.bWii);
SetupBAT(config.bWii);
CopyDefaultExceptionHandlers();
if (config.bWii)
{
PowerPC::ppcState.spr[SPR_HID0] = 0x0011c464;
PowerPC::ppcState.spr[SPR_HID4] = 0x82000000;
// Set a value for the SP. It doesn't matter where this points to,
// as long as it is a valid location. This value is taken from a homebrew binary.
PowerPC::ppcState.gpr[1] = 0x8004d4bc;