From: WANG Xuerui <git@xen0n.name>
To: linux-mips@vger.kernel.org
Cc: WANG Xuerui <git@xen0n.name>
Subject: [PATCH v4 0/1] CPUCFG emulation on older Loongson64 cores
Date: Sat, 23 May 2020 21:37:00 +0800 [thread overview]
Message-ID: <20200523133701.40367-1-git@xen0n.name> (raw)
This patch brings the CPUCFG instruction to older Loongson64 cores,
enabling a unified way to query processor characteristics on Loongson64
systems. Previous question of how to best integrate machtype-specific
and machtype-agnostic cpu probe logic is resolved. (thanks Thomas for
reviewing!)
Tested on Loongson-3A3000.
Also, to aid userspace in determining CPUCFG availability without having
to handle SIGILL or parse /proc/cpuinfo, a new HWCAP flag is to be added
in a later patch. I am waiting for consensus before implementing this,
as it would be part of userspace ABI.
v4:
- Fixed line wrapping as suggested by Huacai
v3:
- Fixed build on !CONFIG_MACH_LOONGSON64
- Refactored to minimize intrusion to machtype-agnostic cpu probe logic
- Minor tweaks to comment and Kconfig wording
- Dropped Reviewed-by and Tested-by from Jiaxun as the code is
refactored significantly
v2:
- Fixed one more typo in loongson_regs.h
- Merged simulate_loongson3_csr and simulate_loongson3_csr_cpucfg into
one (simulate_loongson3_cpucfg), per Huacai's suggestion
WANG Xuerui (1):
MIPS: emulate CPUCFG instruction on older Loongson64 cores
arch/mips/Kconfig | 12 +
arch/mips/include/asm/cpu-info.h | 9 +
.../include/asm/mach-loongson64/cpucfg-emul.h | 63 +++++
arch/mips/kernel/cpu-probe.c | 9 +
arch/mips/kernel/traps.c | 45 ++++
arch/mips/loongson64/Makefile | 1 +
arch/mips/loongson64/cpucfg-emul.c | 217 ++++++++++++++++++
7 files changed, 356 insertions(+)
create mode 100644 arch/mips/include/asm/mach-loongson64/cpucfg-emul.h
create mode 100644 arch/mips/loongson64/cpucfg-emul.c
--
2.21.0
next reply other threads:[~2020-05-23 13:37 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-23 13:37 WANG Xuerui [this message]
2020-05-23 13:37 ` [PATCH v4 1/1] MIPS: emulate CPUCFG instruction on older Loongson64 cores WANG Xuerui
2020-05-24 7:37 ` Thomas Bogendoerfer
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