[PATCH V11 05/22] LoongArch: Add build infrastructure

From: Huacai Chen
Date: Wed May 18 2022 - 05:32:12 EST

Add Kbuild, Makefile, Kconfig and link script for LoongArch build
infrastructure.

Signed-off-by: Huacai Chen <chenhuacai@xxxxxxxxxxx>
---
arch/loongarch/Kbuild | 6 +
arch/loongarch/Kconfig | 395 +++++++++++++++++++++++++
arch/loongarch/Kconfig.debug | 0
arch/loongarch/Makefile | 105 +++++++
arch/loongarch/boot/.gitignore | 2 +
arch/loongarch/boot/Makefile | 20 ++
arch/loongarch/boot/dts/Makefile | 4 +
arch/loongarch/include/asm/Kbuild | 30 ++
arch/loongarch/include/uapi/asm/Kbuild | 2 +
arch/loongarch/kernel/.gitignore | 2 +
arch/loongarch/kernel/Makefile | 21 ++
arch/loongarch/kernel/vmlinux.lds.S | 117 ++++++++
arch/loongarch/lib/Makefile | 6 +
arch/loongarch/mm/Makefile | 9 +
arch/loongarch/pci/Makefile | 7 +
arch/loongarch/vdso/.gitignore | 2 +
scripts/subarch.include | 2 +-
17 files changed, 729 insertions(+), 1 deletion(-)
create mode 100644 arch/loongarch/Kbuild
create mode 100644 arch/loongarch/Kconfig
create mode 100644 arch/loongarch/Kconfig.debug
create mode 100644 arch/loongarch/Makefile
create mode 100644 arch/loongarch/boot/.gitignore
create mode 100644 arch/loongarch/boot/Makefile
create mode 100644 arch/loongarch/boot/dts/Makefile
create mode 100644 arch/loongarch/include/asm/Kbuild
create mode 100644 arch/loongarch/include/uapi/asm/Kbuild
create mode 100644 arch/loongarch/kernel/.gitignore
create mode 100644 arch/loongarch/kernel/Makefile
create mode 100644 arch/loongarch/kernel/vmlinux.lds.S
create mode 100644 arch/loongarch/lib/Makefile
create mode 100644 arch/loongarch/mm/Makefile
create mode 100644 arch/loongarch/pci/Makefile
create mode 100644 arch/loongarch/vdso/.gitignore

diff --git a/arch/loongarch/Kbuild b/arch/loongarch/Kbuild
new file mode 100644
index 000000000000..ab5373d0a24f
--- /dev/null
+++ b/arch/loongarch/Kbuild
@@ -0,0 +1,6 @@
+obj-y += kernel/
+obj-y += mm/
+obj-y += vdso/
+
+# for cleaning
+subdir- += boot
diff --git a/arch/loongarch/Kconfig b/arch/loongarch/Kconfig
new file mode 100644
index 000000000000..09902903bba8
--- /dev/null
+++ b/arch/loongarch/Kconfig
@@ -0,0 +1,395 @@
+# SPDX-License-Identifier: GPL-2.0
+config LOONGARCH
+ bool
+ default y
+ select ACPI_MCFG if ACPI
+ 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_KMEMLEAK
+ 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_PCI
+ 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 PCI
+ select PCI_DOMAINS_GENERIC
+ select PCI_ECAM if ACPI
+ select PCI_MSI_ARCH_FALLBACKS
+ 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 EFI_STUB
+ bool "EFI boot stub support"
+ default y
+ depends on EFI
+ select EFI_GENERIC_STUB
+ help
+ This kernel feature allows the kernel to be loaded directly by
+ EFI firmware without the use of a bootloader.
+
+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"
diff --git a/arch/loongarch/Kconfig.debug b/arch/loongarch/Kconfig.debug
new file mode 100644
index 000000000000..e69de29bb2d1
diff --git a/arch/loongarch/Makefile b/arch/loongarch/Makefile
new file mode 100644
index 000000000000..6dcc0495bec9
--- /dev/null
+++ b/arch/loongarch/Makefile
@@ -0,0 +1,105 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Author: Huacai Chen <chenhuacai@xxxxxxxxxxx>
+# Copyright (C) 2020-2022 Loongson Technology Corporation Limited
+
+boot := arch/loongarch/boot
+
+ifndef CONFIG_EFI_STUB
+KBUILD_IMAGE = $(boot)/vmlinux
+else
+KBUILD_IMAGE = $(boot)/vmlinux.efi
+endif
+
+#
+# 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)
+
+drivers-$(CONFIG_PCI) += arch/loongarch/pci/
+
+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/
+libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
+
+ifeq ($(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
diff --git a/arch/loongarch/boot/.gitignore b/arch/loongarch/boot/.gitignore
new file mode 100644
index 000000000000..49423ee96ef3
--- /dev/null
+++ b/arch/loongarch/boot/.gitignore
@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0-only
+vmlinux*
diff --git a/arch/loongarch/boot/Makefile b/arch/loongarch/boot/Makefile
new file mode 100644
index 000000000000..b39d50a7a3df
--- /dev/null
+++ b/arch/loongarch/boot/Makefile
@@ -0,0 +1,20 @@
+#
+# arch/loongarch/boot/Makefile
+#
+# Copyright (C) 2020-2022 Loongson Technology Corporation Limited
+#
+
+drop-sections := .comment .note .options .note.gnu.build-id
+strip-flags := $(addprefix --remove-section=,$(drop-sections)) -S
+OBJCOPYFLAGS_vmlinux.efi := -O binary $(strip-flags)
+
+targets := vmlinux
+quiet_cmd_strip = STRIP $@
+ cmd_strip = $(STRIP) -s -o $@ $<
+
+$(obj)/vmlinux: vmlinux FORCE
+ $(call if_changed,strip)
+
+targets += vmlinux.efi
+$(obj)/vmlinux.efi: $(obj)/vmlinux FORCE
+ $(call if_changed,objcopy)
diff --git a/arch/loongarch/boot/dts/Makefile b/arch/loongarch/boot/dts/Makefile
new file mode 100644
index 000000000000..5f1f55e911ad
--- /dev/null
+++ b/arch/loongarch/boot/dts/Makefile
@@ -0,0 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0-only
+dtstree := $(srctree)/$(src)
+
+dtb-y := $(patsubst $(dtstree)/%.dts,%.dtb, $(wildcard $(dtstree)/*.dts))
diff --git a/arch/loongarch/include/asm/Kbuild b/arch/loongarch/include/asm/Kbuild
new file mode 100644
index 000000000000..83bc0681e72b
--- /dev/null
+++ b/arch/loongarch/include/asm/Kbuild
@@ -0,0 +1,30 @@
+# SPDX-License-Identifier: GPL-2.0
+generic-y += dma-contiguous.h
+generic-y += export.h
+generic-y += parport.h
+generic-y += early_ioremap.h
+generic-y += qrwlock.h
+generic-y += qrwlock_types.h
+generic-y += spinlock.h
+generic-y += spinlock_types.h
+generic-y += rwsem.h
+generic-y += segment.h
+generic-y += user.h
+generic-y += stat.h
+generic-y += fcntl.h
+generic-y += ioctl.h
+generic-y += ioctls.h
+generic-y += mman.h
+generic-y += msgbuf.h
+generic-y += sembuf.h
+generic-y += shmbuf.h
+generic-y += statfs.h
+generic-y += socket.h
+generic-y += sockios.h
+generic-y += termios.h
+generic-y += termbits.h
+generic-y += poll.h
+generic-y += param.h
+generic-y += posix_types.h
+generic-y += resource.h
+generic-y += kvm_para.h
diff --git a/arch/loongarch/include/uapi/asm/Kbuild b/arch/loongarch/include/uapi/asm/Kbuild
new file mode 100644
index 000000000000..4aa680ca2e5f
--- /dev/null
+++ b/arch/loongarch/include/uapi/asm/Kbuild
@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0
+generic-y += kvm_para.h
diff --git a/arch/loongarch/kernel/.gitignore b/arch/loongarch/kernel/.gitignore
new file mode 100644
index 000000000000..bbb90f92d051
--- /dev/null
+++ b/arch/loongarch/kernel/.gitignore
@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0-only
+vmlinux.lds
diff --git a/arch/loongarch/kernel/Makefile b/arch/loongarch/kernel/Makefile
new file mode 100644
index 000000000000..e5a3b2fb9961
--- /dev/null
+++ b/arch/loongarch/kernel/Makefile
@@ -0,0 +1,21 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for the Linux/LoongArch kernel.
+#
+
+extra-y := head.o vmlinux.lds
+
+obj-y += cpu-probe.o cacheinfo.o env.o setup.o entry.o genex.o \
+ traps.o irq.o idle.o process.o dma.o mem.o io.o reset.o switch.o \
+ elf.o syscall.o signal.o time.o topology.o inst.o ptrace.o vdso.o
+
+obj-$(CONFIG_ACPI) += acpi.o
+obj-$(CONFIG_EFI) += efi.o
+
+obj-$(CONFIG_CPU_HAS_FPU) += fpu.o
+
+obj-$(CONFIG_MODULES) += module.o module-sections.o
+
+obj-$(CONFIG_PROC_FS) += proc.o
+
+CPPFLAGS_vmlinux.lds := $(KBUILD_CFLAGS)
diff --git a/arch/loongarch/kernel/vmlinux.lds.S b/arch/loongarch/kernel/vmlinux.lds.S
new file mode 100644
index 000000000000..7da4c4d7c50d
--- /dev/null
+++ b/arch/loongarch/kernel/vmlinux.lds.S
@@ -0,0 +1,117 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#include <linux/sizes.h>
+#include <asm/asm-offsets.h>
+#include <asm/thread_info.h>
+
+#define PAGE_SIZE _PAGE_SIZE
+
+/*
+ * Put .bss..swapper_pg_dir as the first thing in .bss. This will
+ * ensure that it has .bss alignment (64K).
+ */
+#define BSS_FIRST_SECTIONS *(.bss..swapper_pg_dir)
+
+#include <asm-generic/vmlinux.lds.h>
+#include "image-vars.h"
+
+/*
+ * Max avaliable Page Size is 64K, so we set SectionAlignment
+ * field of EFI application to 64K.
+ */
+PECOFF_FILE_ALIGN = 0x200;
+PECOFF_SEGMENT_ALIGN = 0x10000;
+
+OUTPUT_ARCH(loongarch)
+ENTRY(kernel_entry)
+PHDRS {
+ text PT_LOAD FLAGS(7); /* RWX */
+ note PT_NOTE FLAGS(4); /* R__ */
+}
+
+jiffies = jiffies_64;
+
+SECTIONS
+{
+ . = VMLINUX_LOAD_ADDRESS;
+
+ _text = .;
+ HEAD_TEXT_SECTION
+
+ . = ALIGN(PECOFF_SEGMENT_ALIGN);
+ .text : {
+ TEXT_TEXT
+ SCHED_TEXT
+ CPUIDLE_TEXT
+ LOCK_TEXT
+ KPROBES_TEXT
+ IRQENTRY_TEXT
+ SOFTIRQENTRY_TEXT
+ *(.fixup)
+ *(.gnu.warning)
+ } :text = 0
+ . = ALIGN(PECOFF_SEGMENT_ALIGN);
+ _etext = .;
+
+ EXCEPTION_TABLE(16)
+
+ . = ALIGN(PECOFF_SEGMENT_ALIGN);
+ __init_begin = .;
+ __inittext_begin = .;
+
+ INIT_TEXT_SECTION(PAGE_SIZE)
+ .exit.text : {
+ EXIT_TEXT
+ }
+
+ . = ALIGN(PECOFF_SEGMENT_ALIGN);
+ __inittext_end = .;
+
+ __initdata_begin = .;
+
+ INIT_DATA_SECTION(16)
+ .exit.data : {
+ EXIT_DATA
+ }
+
+ .init.bss : {
+ *(.init.bss)
+ }
+ . = ALIGN(PECOFF_SEGMENT_ALIGN);
+ __initdata_end = .;
+
+ __init_end = .;
+
+ _sdata = .;
+ RO_DATA(4096)
+ RW_DATA(1 << CONFIG_L1_CACHE_SHIFT, PAGE_SIZE, THREAD_SIZE)
+
+ .sdata : {
+ *(.sdata)
+ }
+ .edata_padding : { BYTE(0); . = ALIGN(PECOFF_FILE_ALIGN); }
+ _edata = .;
+
+ BSS_SECTION(0, SZ_64K, 8)
+ . = ALIGN(PECOFF_SEGMENT_ALIGN);
+
+ _end = .;
+
+ STABS_DEBUG
+ DWARF_DEBUG
+
+ .gptab.sdata : {
+ *(.gptab.data)
+ *(.gptab.sdata)
+ }
+ .gptab.sbss : {
+ *(.gptab.bss)
+ *(.gptab.sbss)
+ }
+
+ DISCARDS
+ /DISCARD/ : {
+ *(.gnu.attributes)
+ *(.options)
+ *(.eh_frame)
+ }
+}
diff --git a/arch/loongarch/lib/Makefile b/arch/loongarch/lib/Makefile
new file mode 100644
index 000000000000..e36635fccb69
--- /dev/null
+++ b/arch/loongarch/lib/Makefile
@@ -0,0 +1,6 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for LoongArch-specific library files.
+#
+
+lib-y += delay.o clear_user.o copy_user.o dump_tlb.o
diff --git a/arch/loongarch/mm/Makefile b/arch/loongarch/mm/Makefile
new file mode 100644
index 000000000000..8ffc6383f836
--- /dev/null
+++ b/arch/loongarch/mm/Makefile
@@ -0,0 +1,9 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for the Linux/LoongArch-specific parts of the memory manager.
+#
+
+obj-y += init.o cache.o tlb.o tlbex.o extable.o \
+ fault.o ioremap.o maccess.o mmap.o pgtable.o page.o
+
+obj-$(CONFIG_HUGETLB_PAGE) += hugetlbpage.o
diff --git a/arch/loongarch/pci/Makefile b/arch/loongarch/pci/Makefile
new file mode 100644
index 000000000000..8101ef3df71c
--- /dev/null
+++ b/arch/loongarch/pci/Makefile
@@ -0,0 +1,7 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for the PCI specific kernel interface routines under Linux.
+#
+
+obj-y += pci.o
+obj-$(CONFIG_ACPI) += acpi.o
diff --git a/arch/loongarch/vdso/.gitignore b/arch/loongarch/vdso/.gitignore
new file mode 100644
index 000000000000..652e31d82582
--- /dev/null
+++ b/arch/loongarch/vdso/.gitignore
@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0-only
+vdso.lds
diff --git a/scripts/subarch.include b/scripts/subarch.include
index 776849a3c500..4bd327d0ae42 100644
--- a/scripts/subarch.include
+++ b/scripts/subarch.include
@@ -10,4 +10,4 @@ SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
-e s/s390x/s390/ \
-e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
-e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ \
- -e s/riscv.*/riscv/)
+ -e s/riscv.*/riscv/ -e s/loongarch.*/loongarch/)
--
2.27.0