diff options
Diffstat (limited to 'arch/mips/loongson2ef/Platform')
| -rw-r--r-- | arch/mips/loongson2ef/Platform | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/arch/mips/loongson2ef/Platform b/arch/mips/loongson2ef/Platform new file mode 100644 index 000000000..eebabf9df --- /dev/null +++ b/arch/mips/loongson2ef/Platform @@ -0,0 +1,47 @@ +# +# Loongson Processors' Support +# + +cflags-$(CONFIG_CPU_LOONGSON2EF) += -Wa,--trap +cflags-$(CONFIG_CPU_LOONGSON2E) += -march=loongson2e +cflags-$(CONFIG_CPU_LOONGSON2F) += -march=loongson2f +# +# Some versions of binutils, not currently mainline as of 2019/02/04, support +# an -mfix-loongson3-llsc flag which emits a sync prior to each ll instruction +# to work around a CPU bug (see __SYNC_loongson3_war in asm/sync.h for a +# description). +# +# We disable this in order to prevent the assembler meddling with the +# instruction that labels refer to, ie. if we label an ll instruction: +# +# 1: ll v0, 0(a0) +# +# ...then with the assembler fix applied the label may actually point at a sync +# instruction inserted by the assembler, and if we were using the label in an +# exception table the table would no longer contain the address of the ll +# instruction. +# +# Avoid this by explicitly disabling that assembler behaviour. If upstream +# binutils does not merge support for the flag then we can revisit & remove +# this later - for now it ensures vendor toolchains don't cause problems. +# +cflags-$(CONFIG_CPU_LOONGSON2EF) += $(call as-option,-Wa$(comma)-mno-fix-loongson3-llsc,) + +# Enable the workarounds for Loongson2f +ifdef CONFIG_CPU_LOONGSON2F_WORKAROUNDS +cflags-$(CONFIG_CPU_NOP_WORKAROUNDS) += -Wa,-mfix-loongson2f-nop +cflags-$(CONFIG_CPU_JUMP_WORKAROUNDS) += -Wa,-mfix-loongson2f-jump +endif + +# Some -march= flags enable MMI instructions, and GCC complains about that +# support being enabled alongside -msoft-float. Thus explicitly disable MMI. +cflags-y += $(call cc-option,-mno-loongson-mmi) + +# +# Loongson Machines' Support +# + +cflags-$(CONFIG_MACH_LOONGSON2EF) += -I$(srctree)/arch/mips/include/asm/mach-loongson2ef +cflags-$(CONFIG_CC_HAS_MNO_BRANCH_LIKELY) += -mno-branch-likely +load-$(CONFIG_LEMOTE_FULOONG2E) += 0xffffffff80100000 +load-$(CONFIG_LEMOTE_MACH2F) += 0xffffffff80200000 |