Add TPM 1.2, 2.0 emulation, UEFI with Secure Boot emulation on Bochs x86 emulator

[youself64github]

Windows 11 requires TPM 2.0 and UEFI with Secure Boot and also, Some OSes only work in UEFI and not in Legacy BIOS, So Bochs x86 emulator needs to add TPM 1.2, TPM 2.0, UEFI BIOS with Secure Boot Support emulation.

[DrChat]

Some prior work/discussion with UEFI:
https://sourceforge.net/p/bochs/mailman/bochs-developers/thread/020e01caf5f5%24c4c7c6e0%244e5754a0%24%40com/
https://forum.osdev.org/viewtopic.php?f=1&t=33440

Note that Bochs actually already effectively supports UEFI. I had to bump BIOSROMSZ, and OVMF loads up just fine.

[DrChat]

Note that OVMF does not embed ACPI tables anymore - they defer to qemu via a pseudo fwcfg device: https://vinxue.github.io/2022/03/01/ovmf_uefi_with_acpi.html

https://github.com/tianocore/edk2/blob/ccf91b518f22102d446f26320110d30ea0fc1fa9/OvmfPkg/AcpiPlatformDxe/AcpiPlatform.c#L45
https://github.com/tianocore/edk2/blob/ccf91b518f22102d446f26320110d30ea0fc1fa9/OvmfPkg/Library/AcpiPlatformLib/QemuFwCfgAcpi.c#L1099

This would need to be implemented by Bochs in order to boot into Windows. Specifically, the bootloader requires the MADT table.

[DrChat]

@stlintel Would you accept a PR that bumps BIOSROMSZ to 4M? It's needed in order to run a standard OVMF build.

I am not alone here. I think it can be accepted.

[DrChat]

Note: For reference, I'm using OVMF based on edk2-stable202105 with this patchset:
bochs.patch

[youself64github]

I tried OVMF bios on Bochs, but it panics then Bochs crashed for me.

[godmar]

Could you clarify - are you saying that Bochs 2.7/2.8 does not provide ACPI tables such as the RSDT and MADT at all when used with its default BIOS?

I just updated our teaching OS to implement ACPI (since Qemu is phasing out MPP tables) and although we mostly use Qemu, we'd love to retain the ability to support Bochs as well, but ideally not at the price of having both an ACPI and an MPP based implementation - we'd like to keep our code small.

[godmar]

Could you clarify - are you saying that Bochs 2.7/2.8 does not provide ACPI tables such as the RSDT and MADT at all when used with its default BIOS?

I just updated our teaching OS to implement ACPI (since Qemu is phasing out MPP tables) and although we mostly use Qemu, we'd love to retain the ability to support Bochs as well, but ideally not at the price of having both an ACPI and an MPP based implementation - we'd like to keep our code small.

Following up on my own question - no, Bochs does support ACPI tables in its default (legacy boot) configuration. This thread is about future UEFI support.