Diffusion FreeBSD src repository - subversion rS295253

Reuse gp register for pcpu pointer.
rS295253
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Description

Reuse gp register for pcpu pointer.

gp (global pointer) is used by compiler in userland only,
so re-use it for pcpup in kernel, save it on stack on switching
out to userland and load back on return to kernel.

Discussed with: jhb, andrew, kib
Sponsored by: DARPA, AFRL
Sponsored by: HEIF5
Differential Revision: https://reviews.freebsd.org/D5178

Details

Provenance

br	Authored on

Differential Revision

D5178: Re-use gp register for PCPU.

Parents

rS295252: ARM: Don't use ugly (and hidden) global variable, control register is

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Event Timeline

br committed rS295253: Reuse gp register for pcpu pointer..Feb 4 2016, 12:49 PM

Changes (6)

Path

Size

head/

sys/

riscv/

include/

riscv/

rS295253

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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

Reuse gp register for pcpu pointer.rS295253Actions

Description

Details

Event Timeline

Changes (6)

rS295253

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

Reuse gp register for pcpu pointer.
rS295253
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