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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 344ebf0994 ("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
hifive-unleashed-5.1
谢致邦 (XIE Zhibang) 2017-06-01 18:41:34 +08:00 committed by Paul Burton
parent 6386889ac2
commit 968dc5a0ea
No known key found for this signature in database
GPG Key ID: 3EA79FACB57500DD
2 changed files with 6 additions and 7 deletions
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8
arch/mips/Kconfig
View File

@ -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

5
arch/mips/loongson32/Platform
View File

@ -1,7 +1,4 @@
cflags-$(CONFIG_CPU_LOONGSON1) += \
$(call cc-option,-march=mips32r2,-mips32r2 -U_MIPS_ISA -D_MIPS_ISA=_MIPS_ISA_MIPS32) \
-Wa,-mips32r2 -Wa,--trap
cflags-$(CONFIG_CPU_LOONGSON1) += -march=mips32 -Wa,--trap
platform-$(CONFIG_MACH_LOONGSON32) += loongson32/
cflags-$(CONFIG_MACH_LOONGSON32) += -I$(srctree)/arch/mips/include/asm/mach-loongson32
load-$(CONFIG_LOONGSON1_LS1B) += 0xffffffff80100000