Update comment about ABI of flush_l1s_sw to match the reality.
CPUID instruction clobbers %rbx and %rdx. Sponsored by: The FreeBSD Foundation MFC after: 13 days
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svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=338113
@ -1230,9 +1230,9 @@ END(handle_ibrs_exit_rs)
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* Flush L1D cache. Load enough of the data from the kernel text
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* Flush L1D cache. Load enough of the data from the kernel text
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* to flush existing L1D content.
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* to flush existing L1D content.
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*
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*
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* N.B. The function follows ABI calling conventions, but the vmm.ko
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* N.B. The function does not follow ABI calling conventions, it corrupts %rbx.
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* caller expects that only %rax, %rcx, %r9, and %rflags registers
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* The vmm.ko caller expects that only %rax, %rdx, %rbx, %rcx, %r9, and %rflags
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* are clobbered.
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* registers are clobbered. The NMI handler caller only needs %r13 preserved.
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*/
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*/
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ENTRY(flush_l1d_sw)
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ENTRY(flush_l1d_sw)
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#define L1D_FLUSH_SIZE (64 * 1024)
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#define L1D_FLUSH_SIZE (64 * 1024)
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