mirror of
https://github.com/jamesstringer90/appsandbox.git
synced 2026-10-22 02:52:49 -05:00
James Stringer
e5acdaaf8b
iso-patch builds an arm64 Ubuntu VHDX: the grub/shim/EFI, apt, dxcore and mesa paths are selected from the build arch at compile time via the new target_arch.h, and the arm64 serial console is ttyAMA0 (PL011) not ttyS0. x64 behavior is unchanged. (Windows-on-ARM support landed in the previous commit.) Known issue: an arm64 Ubuntu 26.04 LTS guest boots very slowly on this platform and is not usable in practice yet — Windows is the supported arm64 guest for now. The 26.04 generic kernel is built CONFIG_BPF_JIT_ALWAYS_ON (+RODATA_FULL), so systemd's constant BPF churn JIT-allocs and frees executable memory, and each free issues a broadcast cross-CPU TLB/cache-maintenance op (TLBI ..IS). arm64 has no Hyper-V paravirt TLB flush, so the hypervisor traps every one and the cost scales with vCPU count; the host's experimental Insider Hyper-V services them slowly. Fewer vCPUs or a stable Hyper-V build mitigate it. Also trim the previous commit's ARM code comments down to the essential architectural differences.
49 lines
1.8 KiB
C
49 lines
1.8 KiB
C
/* target_arch.h - compile-time target architecture for the Linux guest.
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*
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* iso-patch is built per-arch and only ever processes a same-arch Ubuntu ISO,
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* so the build architecture is the guest architecture. Each Ubuntu/Debian arch
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* token below has a wide (IP_*) and a narrow (IP_*_A) form, for splicing into
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* the embedded first-boot shell script.
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*/
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#ifndef ISO_PATCH_TARGET_ARCH_H
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#define ISO_PATCH_TARGET_ARCH_H
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#if defined(_M_ARM64)
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# define IP_IS_ARM64 1
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#else
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# define IP_IS_ARM64 0
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#endif
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#if IP_IS_ARM64
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# define IP_DEB_ARCH L"arm64"
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# define IP_DEB_ARCH_A "arm64"
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# define IP_GRUB_PLATFORM L"arm64-efi"
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# define IP_GRUB_PLATFORM_A "arm64-efi"
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# define IP_EFI_SFX L"aa64"
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# define IP_EFI_SFX_UP L"AA64"
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# define IP_MULTIARCH_A "aarch64-linux-gnu"
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# define IP_DZN_ICD_A "dzn_icd.aarch64.json"
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# define IP_D3D_LIBDIR L"arm64"
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/* Serial console for the HCS COM1 port: arm64 = PL011 -> ttyAMA0 (not ttyS0),
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matching microsoft/hcsshim's LCOW console=ttyAMA0. earlycon reads the ACPI
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SPCR for early boot output; earlyprintk is x86-only. */
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# define IP_SERIAL_A "ttyAMA0"
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# define IP_EARLYCON_A "earlycon "
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# define IP_EARLYPRINTK_A ""
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#else
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# define IP_DEB_ARCH L"amd64"
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# define IP_DEB_ARCH_A "amd64"
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# define IP_GRUB_PLATFORM L"x86_64-efi"
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# define IP_GRUB_PLATFORM_A "x86_64-efi"
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# define IP_EFI_SFX L"x64"
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# define IP_EFI_SFX_UP L"X64"
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# define IP_MULTIARCH_A "x86_64-linux-gnu"
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# define IP_DZN_ICD_A "dzn_icd.x86_64.json"
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# define IP_D3D_LIBDIR L"x64"
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# define IP_SERIAL_A "ttyS0"
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# define IP_EARLYCON_A ""
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# define IP_EARLYPRINTK_A "earlyprintk=ttyS0"
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#endif
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#endif /* ISO_PATCH_TARGET_ARCH_H */
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