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| author | 谢致邦 (XIE Zhibang) <Yeking@Red54.com> | 2017-06-01 18:41:34 +0800 |
|---|---|---|
| committer | Paul Burton <paul.burton@mips.com> | 2018-07-30 18:54:15 -0700 |
| commit | 968dc5a0eaca707f8eb2fbad57d9fbbf3284541e (patch) | |
| tree | 4520f3977b4e6e9ba5dcc195911f3d6f16f693c5 /arch/mips/Kconfig | |
| parent | 6386889ac23e2c1c8276a111765421577539dd7a (diff) | |
| download | lwn-968dc5a0eaca707f8eb2fbad57d9fbbf3284541e.tar.gz lwn-968dc5a0eaca707f8eb2fbad57d9fbbf3284541e.zip | |
MIPS: Loongson: Set Loongson32 to MIPS32R1
LS232 (Loonson 2-issue 32-bit, also called GS232 (Godson 2-issue 32-bit))
is the CPU core (microarchitecture) of Loongson 1A/1B/1C.
According to "LS232 用户手册 (LS232 User Manual)", LS232 implements the
MIPS32 Release 1 instruction set, and part of the MIPS32 Release 2
instruction set.
In the manual, LS232 implements all of the MIPS32R2 instruction set
except the FPU instructions, and LS232 also implements 5 FPU
instructions of the MIPS32R2 instruction set: CEIL.L.fmt, CVT.L.fmt,
FLOOR.L.fmt, TRUNC.L.fmt, and ROUND.L.fmt.
But a bug of the DI instruction has been found during tests, the DI
instruction can not disable interrupts in arch_local_irq_disable() with
CONFIG_PREEMPT_NONE=y and CFLAGS='-mno-branch-likely' in some cases.
[paul.burton@mips.com:
- Remove the _MIPS_ISA redefinition to match the change made for the
generic MIPSr1 CPUs by commit 344ebf09949c ("MIPS: Always use
-march=<arch>, not -<arch> shortcuts").]
Signed-off-by: 谢致邦 (XIE Zhibang) <Yeking@Red54.com>
Signed-off-by: Paul Burton <paul.burton@mips.com>
Patchwork: https://patchwork.linux-mips.org/patch/16155/
Cc: linux-mips@linux-mips.org
Cc: ralf@linux-mips.org
Diffstat (limited to 'arch/mips/Kconfig')
| -rw-r--r-- | arch/mips/Kconfig | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig index c95eb5ad0d96..642a56e2a1ea 100644 --- a/arch/mips/Kconfig +++ b/arch/mips/Kconfig @@ -1424,7 +1424,8 @@ config CPU_LOONGSON1B select LEDS_GPIO_REGISTER help The Loongson 1B is a 32-bit SoC, which implements the MIPS32 - release 2 instruction set. + Release 1 instruction set and part of the MIPS32 Release 2 + instruction set. config CPU_LOONGSON1C bool "Loongson 1C" @@ -1433,7 +1434,8 @@ config CPU_LOONGSON1C select LEDS_GPIO_REGISTER help The Loongson 1C is a 32-bit SoC, which implements the MIPS32 - release 2 instruction set. + Release 1 instruction set and part of the MIPS32 Release 2 + instruction set. config CPU_MIPS32_R1 bool "MIPS32 Release 1" @@ -1833,7 +1835,7 @@ config CPU_LOONGSON2 config CPU_LOONGSON1 bool select CPU_MIPS32 - select CPU_MIPSR2 + select CPU_MIPSR1 select CPU_HAS_PREFETCH select CPU_SUPPORTS_32BIT_KERNEL select CPU_SUPPORTS_HIGHMEM |