Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) #
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) # Loongson Processors' Support
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3) #
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6) cflags-$(CONFIG_CPU_LOONGSON64)	+= -Wa,--trap
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) #
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) # binutils from v2.25 on and gcc starting from v4.9.0 treat -march=loongson3a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) # as MIPS64 R2; older versions as just R1.  This leaves the possibility open
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) # that GCC might generate R2 code for -march=loongson3a which then is rejected
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) # by GAS.  The cc-option can't probe for this behaviour so -march=loongson3a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) # can't easily be used safely within the kbuild framework.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) ifeq ($(call cc-ifversion, -ge, 0409, y), y)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16)   ifeq ($(call ld-ifversion, -ge, 225000000, y), y)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17)     cflags-$(CONFIG_CPU_LOONGSON64)  += \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)       $(call cc-option,-march=loongson3a -U_MIPS_ISA -D_MIPS_ISA=_MIPS_ISA_MIPS64)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)   else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)     cflags-$(CONFIG_CPU_LOONGSON64)  += \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)       $(call cc-option,-march=mips64r2,-mips64r2 -U_MIPS_ISA -D_MIPS_ISA=_MIPS_ISA_MIPS64)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)   endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)     cflags-$(CONFIG_CPU_LOONGSON64)  += \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25)       $(call cc-option,-march=mips64r2,-mips64r2 -U_MIPS_ISA -D_MIPS_ISA=_MIPS_ISA_MIPS64)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) # Some -march= flags enable MMI instructions, and GCC complains about that
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) # support being enabled alongside -msoft-float. Thus explicitly disable MMI.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) cflags-y += $(call cc-option,-mno-loongson-mmi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) #
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) # Loongson Machines' Support
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) #
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) cflags-$(CONFIG_MACH_LOONGSON64) += -I$(srctree)/arch/mips/include/asm/mach-loongson64 -mno-branch-likely
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) load-$(CONFIG_CPU_LOONGSON64) += 0xffffffff80200000