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Differential D5178

Re-use gp register for PCPU.
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Authored by br on Feb 3 2016, 3:58 PM.
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kib
jhb
andrew
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rS295253: Reuse gp register for pcpu pointer.

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br updated this revision to Diff 12974.Feb 3 2016, 3:58 PM
br retitled this revision from to Re-use gp register for PCPU..
br updated this object.
br edited the test plan for this revision. (Show Details)
br added reviewers: jhb, andrew, kib.
kib edited edge metadata.Feb 3 2016, 4:25 PM

Is gp == sscratch from the RISC-V privileged spec ?

br added a comment.Feb 3 2016, 4:45 PM
In D5178#110085, @kib wrote:

Is gp == sscratch from the RISC-V privileged spec ?

gp is global pointer (used by compiler in userland only).
sscratch is a temporary register (not related to gp at all).

br added a comment.Feb 3 2016, 4:47 PM

sscratch is used to exchange kernel/userland SP

Closed by commit rS295253: Reuse gp register for pcpu pointer. (authored by br). · Explain WhyFeb 4 2016, 12:49 PM
This revision was automatically updated to reflect the committed changes.

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sys/
riscv/
include/
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riscv/
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Diff 12974

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sys/riscv/include/pcpu.h

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sys/riscv/riscv/exception.S

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sys/riscv/riscv/genassym.c

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sys/riscv/riscv/machdep.c

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sys/riscv/riscv/swtch.S

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sys/riscv/riscv/vm_machdep.c

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