Re-use gp register for PCPU.
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Authored by br on Feb 3 2016, 3:58 PM.

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jhb
andrew

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rS295253: Reuse gp register for pcpu pointer.

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rS FreeBSD src repository - subversion

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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.

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

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).

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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Size

head/

sys/

riscv/

include/

pcpu.h

7 lines

riscv/

17 lines

1 line

11 lines

23 lines

2 lines

Diff 13004

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head/sys/riscv/include/pcpu.h

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head/sys/riscv/riscv/exception.S

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head/sys/riscv/riscv/genassym.c

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head/sys/riscv/riscv/machdep.c

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head/sys/riscv/riscv/swtch.S

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head/sys/riscv/riscv/vm_machdep.c

Re-use gp register for PCPU.ClosedPublicActions

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Diff 13004

head/sys/riscv/include/pcpu.h

head/sys/riscv/riscv/exception.S

head/sys/riscv/riscv/genassym.c

head/sys/riscv/riscv/machdep.c

head/sys/riscv/riscv/swtch.S

head/sys/riscv/riscv/vm_machdep.c

Re-use gp register for PCPU.
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