LoongArch: Add build infrastructure

obj-y += kernel/

obj-y += mm/

obj-y += vdso/

# for cleaning

subdir- += boot

# SPDX-License-Identifier: GPL-2.0

config LOONGARCH

	bool

	default y

	select ACPI_SYSTEM_POWER_STATES_SUPPORT	if ACPI

	select ARCH_BINFMT_ELF_STATE

	select ARCH_ENABLE_MEMORY_HOTPLUG

	select ARCH_ENABLE_MEMORY_HOTREMOVE

	select ARCH_HAS_ACPI_TABLE_UPGRADE	if ACPI

	select ARCH_HAS_PTE_SPECIAL

	select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST

	select ARCH_INLINE_READ_LOCK if !PREEMPTION

	select ARCH_INLINE_READ_LOCK_BH if !PREEMPTION

	select ARCH_INLINE_READ_LOCK_IRQ if !PREEMPTION

	select ARCH_INLINE_READ_LOCK_IRQSAVE if !PREEMPTION

	select ARCH_INLINE_READ_UNLOCK if !PREEMPTION

	select ARCH_INLINE_READ_UNLOCK_BH if !PREEMPTION

	select ARCH_INLINE_READ_UNLOCK_IRQ if !PREEMPTION

	select ARCH_INLINE_READ_UNLOCK_IRQRESTORE if !PREEMPTION

	select ARCH_INLINE_WRITE_LOCK if !PREEMPTION

	select ARCH_INLINE_WRITE_LOCK_BH if !PREEMPTION

	select ARCH_INLINE_WRITE_LOCK_IRQ if !PREEMPTION

	select ARCH_INLINE_WRITE_LOCK_IRQSAVE if !PREEMPTION

	select ARCH_INLINE_WRITE_UNLOCK if !PREEMPTION

	select ARCH_INLINE_WRITE_UNLOCK_BH if !PREEMPTION

	select ARCH_INLINE_WRITE_UNLOCK_IRQ if !PREEMPTION

	select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE if !PREEMPTION

	select ARCH_INLINE_SPIN_TRYLOCK if !PREEMPTION

	select ARCH_INLINE_SPIN_TRYLOCK_BH if !PREEMPTION

	select ARCH_INLINE_SPIN_LOCK if !PREEMPTION

	select ARCH_INLINE_SPIN_LOCK_BH if !PREEMPTION

	select ARCH_INLINE_SPIN_LOCK_IRQ if !PREEMPTION

	select ARCH_INLINE_SPIN_LOCK_IRQSAVE if !PREEMPTION

	select ARCH_INLINE_SPIN_UNLOCK if !PREEMPTION

	select ARCH_INLINE_SPIN_UNLOCK_BH if !PREEMPTION

	select ARCH_INLINE_SPIN_UNLOCK_IRQ if !PREEMPTION

	select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE if !PREEMPTION

	select ARCH_MIGHT_HAVE_PC_PARPORT

	select ARCH_MIGHT_HAVE_PC_SERIO

	select ARCH_SPARSEMEM_ENABLE

	select ARCH_SUPPORTS_ACPI

	select ARCH_SUPPORTS_ATOMIC_RMW

	select ARCH_SUPPORTS_HUGETLBFS

	select ARCH_USE_BUILTIN_BSWAP

	select ARCH_USE_CMPXCHG_LOCKREF

	select ARCH_USE_QUEUED_RWLOCKS

	select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT

	select ARCH_WANTS_NO_INSTR

	select BUILDTIME_TABLE_SORT

	select COMMON_CLK

	select GENERIC_CLOCKEVENTS

	select GENERIC_CMOS_UPDATE

	select GENERIC_CPU_AUTOPROBE

	select GENERIC_ENTRY

	select GENERIC_FIND_FIRST_BIT

	select GENERIC_GETTIMEOFDAY

	select GENERIC_IRQ_MULTI_HANDLER

	select GENERIC_IRQ_PROBE

	select GENERIC_IRQ_SHOW

	select GENERIC_LIB_ASHLDI3

	select GENERIC_LIB_ASHRDI3

	select GENERIC_LIB_CMPDI2

	select GENERIC_LIB_LSHRDI3

	select GENERIC_LIB_UCMPDI2

	select GENERIC_PCI_IOMAP

	select GENERIC_SCHED_CLOCK

	select GENERIC_TIME_VSYSCALL

	select GPIOLIB

	select HAVE_ARCH_AUDITSYSCALL

	select HAVE_ARCH_COMPILER_H

	select HAVE_ARCH_MMAP_RND_BITS if MMU

	select HAVE_ARCH_SECCOMP_FILTER

	select HAVE_ARCH_TRACEHOOK

	select HAVE_ARCH_TRANSPARENT_HUGEPAGE

	select HAVE_ASM_MODVERSIONS

	select HAVE_CONTEXT_TRACKING

	select HAVE_COPY_THREAD_TLS

	select HAVE_DEBUG_STACKOVERFLOW

	select HAVE_DMA_CONTIGUOUS

	select HAVE_EXIT_THREAD

	select HAVE_FAST_GUP

	select HAVE_GENERIC_VDSO

	select HAVE_IOREMAP_PROT

	select HAVE_IRQ_EXIT_ON_IRQ_STACK

	select HAVE_IRQ_TIME_ACCOUNTING

	select HAVE_MEMBLOCK

	select HAVE_MEMBLOCK_NODE_MAP

	select HAVE_MOD_ARCH_SPECIFIC

	select HAVE_NMI

	select HAVE_PERF_EVENTS

	select HAVE_REGS_AND_STACK_ACCESS_API

	select HAVE_RSEQ

	select HAVE_SYSCALL_TRACEPOINTS

	select HAVE_TIF_NOHZ

	select HAVE_VIRT_CPU_ACCOUNTING_GEN

	select IRQ_FORCED_THREADING

	select IRQ_LOONGARCH_CPU

	select MODULES_USE_ELF_RELA if MODULES

	select OF

	select OF_EARLY_FLATTREE

	select PERF_USE_VMALLOC

	select RTC_LIB

	select SPARSE_IRQ

	select SYSCTL_EXCEPTION_TRACE

	select SWIOTLB

	select TRACE_IRQFLAGS_SUPPORT

	select ZONE_DMA32

config 32BIT

	bool

config 64BIT

	def_bool y

config CPU_HAS_FPU

	bool

	default y

config CPU_HAS_PREFETCH

	bool

	default y

config GENERIC_CALIBRATE_DELAY

	def_bool y

config GENERIC_CSUM

	def_bool y

config GENERIC_HWEIGHT

	def_bool y

config L1_CACHE_SHIFT

	int

	default "6"

config LOCKDEP_SUPPORT

	bool

	default y

# MACH_LOONGSON32 and MACH_LOONGSON64 are delibrately carried over from the

# MIPS Loongson code, to preserve Loongson-specific code paths in drivers that

# are shared between architectures, and specifically expecting the symbols.

config MACH_LOONGSON32

	def_bool 32BIT

config MACH_LOONGSON64

	def_bool 64BIT

config PAGE_SIZE_4KB

	bool

config PAGE_SIZE_16KB

	bool

config PAGE_SIZE_64KB

	bool

config PGTABLE_2LEVEL

	bool

config PGTABLE_3LEVEL

	bool

config PGTABLE_4LEVEL

	bool

config PGTABLE_LEVELS

	int

	default 2 if PGTABLE_2LEVEL

	default 3 if PGTABLE_3LEVEL

	default 4 if PGTABLE_4LEVEL

config SCHED_OMIT_FRAME_POINTER

	bool

	default y

menu "Kernel type and options"

source "kernel/Kconfig.hz"

choice

	prompt "Page Table Layout"

	default 16KB_2LEVEL if 32BIT

	default 16KB_3LEVEL if 64BIT

	help

	  Allows choosing the page table layout, which is a combination

	  of page size and page table levels. The size of virtual memory

	  address space are determined by the page table layout.

config 4KB_3LEVEL

	bool "4KB with 3 levels"

	select PAGE_SIZE_4KB

	select PGTABLE_3LEVEL

	help

	  This option selects 4KB page size with 3 level page tables, which

	  support a maximum of 39 bits of application virtual memory.

config 4KB_4LEVEL

	bool "4KB with 4 levels"

	select PAGE_SIZE_4KB

	select PGTABLE_4LEVEL

	help

	  This option selects 4KB page size with 4 level page tables, which

	  support a maximum of 48 bits of application virtual memory.

config 16KB_2LEVEL

	bool "16KB with 2 levels"

	select PAGE_SIZE_16KB

	select PGTABLE_2LEVEL

	help

	  This option selects 16KB page size with 2 level page tables, which

	  support a maximum of 36 bits of application virtual memory.

config 16KB_3LEVEL

	bool "16KB with 3 levels"

	select PAGE_SIZE_16KB

	select PGTABLE_3LEVEL

	help

	  This option selects 16KB page size with 3 level page tables, which

	  support a maximum of 47 bits of application virtual memory.

config 64KB_2LEVEL

	bool "64KB with 2 levels"

	select PAGE_SIZE_64KB

	select PGTABLE_2LEVEL

	help

	  This option selects 64KB page size with 2 level page tables, which

	  support a maximum of 42 bits of application virtual memory.

config 64KB_3LEVEL

	bool "64KB with 3 levels"

	select PAGE_SIZE_64KB

	select PGTABLE_3LEVEL

	help

	  This option selects 64KB page size with 3 level page tables, which

	  support a maximum of 55 bits of application virtual memory.

endchoice

config CMDLINE

	string "Built-in kernel command line"

	help

	  For most platforms, the arguments for the kernel's command line

	  are provided at run-time, during boot. However, there are cases

	  where either no arguments are being provided or the provided

	  arguments are insufficient or even invalid.

	  When that occurs, it is possible to define a built-in command

	  line here and choose how the kernel should use it later on.

choice

	prompt "Kernel command line type"

	default CMDLINE_BOOTLOADER

	help

	  Choose how the kernel will handle the provided built-in command

	  line.

config CMDLINE_BOOTLOADER

	bool "Use bootloader kernel arguments if available"

	help

	  Prefer the command-line passed by the boot loader if available.

	  Use the built-in command line as fallback in case we get nothing

	  during boot. This is the default behaviour.

config CMDLINE_EXTEND

	bool "Use built-in to extend bootloader kernel arguments"

	help

	  The command-line arguments provided during boot will be

	  appended to the built-in command line. This is useful in

	  cases where the provided arguments are insufficient and

	  you don't want to or cannot modify them.

config CMDLINE_FORCE

	bool "Always use the built-in kernel command string"

	help

	  Always use the built-in command line, even if we get one during

	  boot. This is useful in case you need to override the provided

	  command line on systems where you don't have or want control

	  over it.

endchoice

config DMI

	bool "Enable DMI scanning"

	select DMI_SCAN_MACHINE_NON_EFI_FALLBACK

	default y

	help

	  This enables SMBIOS/DMI feature for systems, and scanning of

	  DMI to identify machine quirks.

config EFI

	bool "EFI runtime service support"

	select UCS2_STRING

	select EFI_PARAMS_FROM_FDT

	select EFI_RUNTIME_WRAPPERS

	help

	  This enables the kernel to use EFI runtime services that are

	  available (such as the EFI variable services).

config FORCE_MAX_ZONEORDER

	int "Maximum zone order"

	range 14 64 if PAGE_SIZE_64KB

	default "14" if PAGE_SIZE_64KB

	range 12 64 if PAGE_SIZE_16KB

	default "12" if PAGE_SIZE_16KB

	range 11 64

	default "11"

	help

	  The kernel memory allocator divides physically contiguous memory

	  blocks into "zones", where each zone is a power of two number of

	  pages.  This option selects the largest power of two that the kernel

	  keeps in the memory allocator.  If you need to allocate very large

	  blocks of physically contiguous memory, then you may need to

	  increase this value.

	  This config option is actually maximum order plus one. For example,

	  a value of 11 means that the largest free memory block is 2^10 pages.

	  The page size is not necessarily 4KB.  Keep this in mind

	  when choosing a value for this option.

config SECCOMP

	bool "Enable seccomp to safely compute untrusted bytecode"

	depends on PROC_FS

	default y

	help

	  This kernel feature is useful for number crunching applications

	  that may need to compute untrusted bytecode during their

	  execution. By using pipes or other transports made available to

	  the process as file descriptors supporting the read/write

	  syscalls, it's possible to isolate those applications in

	  their own address space using seccomp. Once seccomp is

	  enabled via /proc/<pid>/seccomp, it cannot be disabled

	  and the task is only allowed to execute a few safe syscalls

	  defined by each seccomp mode.

	  If unsure, say Y. Only embedded should say N here.

endmenu

config ARCH_SELECT_MEMORY_MODEL

	def_bool y

config ARCH_FLATMEM_ENABLE

	def_bool y

config ARCH_SPARSEMEM_ENABLE

	def_bool y

	help

	  Say Y to support efficient handling of sparse physical memory,

	  for architectures which are either NUMA (Non-Uniform Memory Access)

	  or have huge holes in the physical address space for other reasons.

	  See <file:Documentation/vm/numa.rst> for more.

config ARCH_ENABLE_THP_MIGRATION

	def_bool y

	depends on TRANSPARENT_HUGEPAGE

config ARCH_MEMORY_PROBE

	def_bool y

	depends on MEMORY_HOTPLUG

config MMU

	bool

	default y

config ARCH_MMAP_RND_BITS_MIN

	default 12

config ARCH_MMAP_RND_BITS_MAX

	default 18

menu "Power management options"

source "drivers/acpi/Kconfig"

endmenu

source "drivers/firmware/Kconfig"

# SPDX-License-Identifier: GPL-2.0

#

# Author: Huacai Chen <chenhuacai@loongson.cn>

# Copyright (C) 2020-2022 Loongson Technology Corporation Limited

boot	:= arch/loongarch/boot

KBUILD_IMAGE	= $(boot)/vmlinux

#

# Select the object file format to substitute into the linker script.

#

64bit-tool-archpref	= loongarch64

32bit-bfd		= elf32-loongarch

64bit-bfd		= elf64-loongarch

32bit-emul		= elf32loongarch

64bit-emul		= elf64loongarch

ifdef CONFIG_64BIT

tool-archpref		= $(64bit-tool-archpref)

UTS_MACHINE		:= loongarch64

endif

ifneq ($(SUBARCH),$(ARCH))

  ifeq ($(CROSS_COMPILE),)

    CROSS_COMPILE := $(call cc-cross-prefix, $(tool-archpref)-linux-  $(tool-archpref)-linux-gnu-  $(tool-archpref)-unknown-linux-gnu-)

  endif

endif

ifdef CONFIG_64BIT

ld-emul			= $(64bit-emul)

cflags-y		+= -mabi=lp64s

endif

cflags-y			+= -G0 -pipe -msoft-float

LDFLAGS_vmlinux			+= -G0 -static -n -nostdlib

KBUILD_AFLAGS_KERNEL		+= -Wa,-mla-global-with-pcrel

KBUILD_CFLAGS_KERNEL		+= -Wa,-mla-global-with-pcrel

KBUILD_AFLAGS_MODULE		+= -Wa,-mla-global-with-abs

KBUILD_CFLAGS_MODULE		+= -fplt -Wa,-mla-global-with-abs,-mla-local-with-abs

cflags-y += -ffreestanding

cflags-y += $(call cc-option, -mno-check-zero-division)

load-y		= 0x9000000000200000

bootvars-y	= VMLINUX_LOAD_ADDRESS=$(load-y)

KBUILD_AFLAGS	+= $(cflags-y)

KBUILD_CFLAGS	+= $(cflags-y)

KBUILD_CPPFLAGS += -DVMLINUX_LOAD_ADDRESS=$(load-y)

# This is required to get dwarf unwinding tables into .debug_frame

# instead of .eh_frame so we don't discard them.

KBUILD_CFLAGS += -fno-asynchronous-unwind-tables

# Don't emit unaligned accesses.

# Not all LoongArch cores support unaligned access, and as kernel we can't

# rely on others to provide emulation for these accesses.

KBUILD_CFLAGS += $(call cc-option,-mstrict-align)

KBUILD_CFLAGS += -isystem $(shell $(CC) -print-file-name=include)

KBUILD_LDFLAGS	+= -m $(ld-emul)

ifdef CONFIG_LOONGARCH

CHECKFLAGS += $(shell $(CC) $(KBUILD_CFLAGS) -dM -E -x c /dev/null | \

	egrep -vw '__GNUC_(MINOR_|PATCHLEVEL_)?_' | \

	sed -e "s/^\#define /-D'/" -e "s/ /'='/" -e "s/$$/'/" -e 's/\$$/&&/g')

endif

head-y := arch/loongarch/kernel/head.o

libs-y += arch/loongarch/lib/

ifeq ($(KBUILD_EXTMOD),)

prepare: vdso_prepare

vdso_prepare: prepare0

	$(Q)$(MAKE) $(build)=arch/loongarch/vdso include/generated/vdso-offsets.h

endif

PHONY += vdso_install

vdso_install:

	$(Q)$(MAKE) $(build)=arch/loongarch/vdso $@

all:	$(KBUILD_IMAGE)

$(KBUILD_IMAGE): vmlinux

	$(Q)$(MAKE) $(build)=$(boot) $(bootvars-y) $@

install:

	$(Q)install -D -m 755 $(KBUILD_IMAGE) $(INSTALL_PATH)/vmlinux-$(KERNELRELEASE)

	$(Q)install -D -m 644 .config $(INSTALL_PATH)/config-$(KERNELRELEASE)

	$(Q)install -D -m 644 System.map $(INSTALL_PATH)/System.map-$(KERNELRELEASE)

define archhelp

	echo '  install              - install kernel into $(INSTALL_PATH)'

	echo

endef

# SPDX-License-Identifier: GPL-2.0-only

vmlinux*