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riscv: remove sbi_clear_ipi()
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Authored by mhorne on Oct 25 2020, 10:24 PM.
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Details

Summary

S-mode software has write access to the SIP.SSIP bit, so instead of
making a second round-trip through the SBI we can clear it ourselves.
The SBI spec has deprecated this function for this exactly this reason.

Submitted by: Danjel Q. <dan1222@gmail.com>

Test Plan

Boot to multiuser in QEMU.

Diff Detail

Repository
rS FreeBSD src repository - subversion
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Event Timeline

mhorne created this revision.
This revision is now accepted and ready to land.Oct 25 2020, 10:31 PM
sys/riscv/riscv/sbi.c
180 ↗(On Diff #78754)

It strikes me that we should probably panic if these fail even for -NODEBUG kernels?

sys/riscv/riscv/sbi.c
180 ↗(On Diff #78754)

Yes we should. I'll see about a patch for that.

This revision was automatically updated to reflect the committed changes.