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) # Only gcc >= 4.4 have Loongson specific support
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6) cflags-$(CONFIG_CPU_LOONGSON2EF)	+= -Wa,--trap
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) cflags-$(CONFIG_CPU_LOONGSON2E) += \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) 	$(call cc-option,-march=loongson2e,-march=r4600)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) cflags-$(CONFIG_CPU_LOONGSON2F) += \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) 	$(call cc-option,-march=loongson2f,-march=r4600)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) # Some versions of binutils, not currently mainline as of 2019/02/04, support
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) # an -mfix-loongson3-llsc flag which emits a sync prior to each ll instruction
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) # to work around a CPU bug (see __SYNC_loongson3_war in asm/sync.h for a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) # description).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) # We disable this in order to prevent the assembler meddling with the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) # instruction that labels refer to, ie. if we label an ll instruction:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) # 1: ll v0, 0(a0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) # ...then with the assembler fix applied the label may actually point at a sync
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) # instruction inserted by the assembler, and if we were using the label in an
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) # exception table the table would no longer contain the address of the ll
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) # instruction.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) # Avoid this by explicitly disabling that assembler behaviour. If upstream
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) # binutils does not merge support for the flag then we can revisit & remove
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) # this later - for now it ensures vendor toolchains don't cause problems.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) cflags-$(CONFIG_CPU_LOONGSON2EF)	+= $(call as-option,-Wa$(comma)-mno-fix-loongson3-llsc,)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) # Enable the workarounds for Loongson2f
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) ifdef CONFIG_CPU_LOONGSON2F_WORKAROUNDS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35)   ifeq ($(call as-option,-Wa$(comma)-mfix-loongson2f-nop,),)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36)     $(error only binutils >= 2.20.2 have needed option -mfix-loongson2f-nop)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)   else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38)     cflags-$(CONFIG_CPU_NOP_WORKAROUNDS) += -Wa$(comma)-mfix-loongson2f-nop
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39)   endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)   ifeq ($(call as-option,-Wa$(comma)-mfix-loongson2f-jump,),)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41)     $(error only binutils >= 2.20.2 have needed option -mfix-loongson2f-jump)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42)   else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43)     cflags-$(CONFIG_CPU_JUMP_WORKAROUNDS) += -Wa$(comma)-mfix-loongson2f-jump
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44)   endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) # Some -march= flags enable MMI instructions, and GCC complains about that
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) # support being enabled alongside -msoft-float. Thus explicitly disable MMI.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) cflags-y += $(call cc-option,-mno-loongson-mmi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) #
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) # Loongson Machines' Support
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) #
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) cflags-$(CONFIG_MACH_LOONGSON2EF) += -I$(srctree)/arch/mips/include/asm/mach-loongson2ef -mno-branch-likely
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) load-$(CONFIG_LEMOTE_FULOONG2E) += 0xffffffff80100000
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) load-$(CONFIG_LEMOTE_MACH2F) += 0xffffffff80200000