mirror of
https://github.com/ipxe/ipxe
synced 2026-10-07 15:05:42 +03:00
Michael Brown
af9604576d
Commit71560d1("[librm] Preserve FPU, MMX and SSE state across calls to virt_call()") originally introduced the use of "fxsave" and "fxrstor" to work around a bug in the implementation of memcpy() within the IBM Tivoli Provisioning Manager's VMM. This commit assumed (with justification given in the commit message) that SSE support could be assumed to be present on any realistic in-scope CPU, and so these instructions may safely be assumed to be supported. Commitdd9a14d("[librm] Conditionalize the workaround for the Tivoli VMM's SSE garbling") then made this workaround a compile-time conditional, to work around a missing feature in QEMU that caused the use of "fxsave" and "fxrstor" to fail in QEMU VMs on some host CPUs. Commit900f1f9("[librm] Test for FXSAVE/FXRSTOR instruction support") then added a runtime CPUID check for the FXSR feature, to allow the unmodified iPXE binary to be used on older CPUs. Supporting AES hardware acceleration via AES-NI will require setting the CR4.OSFXSR control bit, which in turn must be conditionalised upon the same runtime CPUID check for the FXSR feature. Perform the runtime check unconditionally, and assume that we no longer need the compile-time conditional (i.e. assume either that newer versions of QEMU emulate "fxsave" and "fxrstor" when needed, or that QEMU reports via CPUID that FXSR is not supported if it cannot support those instructions). Signed-off-by: Michael Brown <mcb30@ipxe.org>
11 lines
243 B
C
11 lines
243 B
C
/* Disable entry during POST */
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#undef ROM_BANNER_TIMEOUT
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#define ROM_BANNER_TIMEOUT 0
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/* Extend banner timeout */
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#undef BANNER_TIMEOUT
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#define BANNER_TIMEOUT 30
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/* Work around missing EFI_PXE_BASE_CODE_PROTOCOL */
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#define EFI_DOWNGRADE_UX
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