2 # Loongson Processors' Support
6 cflags-$(CONFIG_CPU_LOONGSON64) += -Wa,--trap
9 # binutils from v2.25 on and gcc starting from v4.9.0 treat -march=loongson3a
10 # as MIPS64 R2; older versions as just R1. This leaves the possibility open
11 # that GCC might generate R2 code for -march=loongson3a which then is rejected
12 # by GAS. The cc-option can't probe for this behaviour so -march=loongson3a
13 # can't easily be used safely within the kbuild framework.
15 ifeq ($(call cc-ifversion, -ge, 0409, y), y)
16 ifeq ($(call ld-ifversion, -ge, 225000000, y), y)
17 cflags-$(CONFIG_CPU_LOONGSON64) += \
18 $(call cc-option,-march=loongson3a -U_MIPS_ISA -D_MIPS_ISA=_MIPS_ISA_MIPS64)
20 cflags-$(CONFIG_CPU_LOONGSON64) += \
21 $(call cc-option,-march=mips64r2,-mips64r2 -U_MIPS_ISA -D_MIPS_ISA=_MIPS_ISA_MIPS64)
24 cflags-$(CONFIG_CPU_LOONGSON64) += \
25 $(call cc-option,-march=mips64r2,-mips64r2 -U_MIPS_ISA -D_MIPS_ISA=_MIPS_ISA_MIPS64)
28 # Some -march= flags enable MMI instructions, and GCC complains about that
29 # support being enabled alongside -msoft-float. Thus explicitly disable MMI.
30 cflags-y += $(call cc-option,-mno-loongson-mmi)
33 # Loongson Machines' Support
36 cflags-$(CONFIG_MACH_LOONGSON64) += -I$(srctree)/arch/mips/include/asm/mach-loongson64 -mno-branch-likely
37 load-$(CONFIG_CPU_LOONGSON64) += 0xffffffff80200000