This patch adds Kbuild, Makefile, Kconfig and link script for LoongArch
build infrastructure.
Signed-off-by: Huacai Chen <[email protected]>
---
arch/loongarch/.gitignore | 9 +
arch/loongarch/Kbuild | 3 +
arch/loongarch/Kconfig | 357 +++++++++++++++++++++++++
arch/loongarch/Kconfig.debug | 0
arch/loongarch/Makefile | 122 +++++++++
arch/loongarch/include/asm/Kbuild | 31 +++
arch/loongarch/include/uapi/asm/Kbuild | 2 +
arch/loongarch/kernel/Makefile | 22 ++
arch/loongarch/kernel/vmlinux.lds.S | 112 ++++++++
arch/loongarch/lib/Makefile | 7 +
arch/loongarch/mm/Makefile | 9 +
arch/loongarch/pci/Makefile | 7 +
scripts/subarch.include | 2 +-
13 files changed, 682 insertions(+), 1 deletion(-)
create mode 100644 arch/loongarch/.gitignore
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/include/asm/Kbuild
create mode 100644 arch/loongarch/include/uapi/asm/Kbuild
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
diff --git a/arch/loongarch/.gitignore b/arch/loongarch/.gitignore
new file mode 100644
index 000000000000..e9c2dedc1c5e
--- /dev/null
+++ b/arch/loongarch/.gitignore
@@ -0,0 +1,9 @@
+*.lds
+*.raw
+calc_vmlinuz_load_addr
+elf-entry
+relocs
+vmlinux.*
+vmlinuz.*
+
+!kernel/vmlinux.lds.S
diff --git a/arch/loongarch/Kbuild b/arch/loongarch/Kbuild
new file mode 100644
index 000000000000..1ad35aabdd16
--- /dev/null
+++ b/arch/loongarch/Kbuild
@@ -0,0 +1,3 @@
+obj-y += kernel/
+obj-y += mm/
+obj-y += vdso/
diff --git a/arch/loongarch/Kconfig b/arch/loongarch/Kconfig
new file mode 100644
index 000000000000..da9fe71b0f5f
--- /dev/null
+++ b/arch/loongarch/Kconfig
@@ -0,0 +1,357 @@
+# 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_DISCARD_MEMBLOCK
+ 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_USE_QUEUED_SPINLOCKS
+ select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT
+ select BUILDTIME_TABLE_SORT
+ select GENERIC_CLOCKEVENTS
+ select GENERIC_CMOS_UPDATE
+ select GENERIC_CPU_AUTOPROBE
+ select GENERIC_ENTRY
+ 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_TIME_VSYSCALL
+ select GPIOLIB
+ select HANDLE_DOMAIN_IRQ
+ 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_FUTEX_CMPXCHG if FUTEX
+ 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_REL if MODULES
+ select MODULES_USE_ELF_RELA if MODULES
+ 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 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
+
+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"
+
+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 virtual memory address
+ space bits 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 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 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 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 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 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 55 bits of application virtual memory.
+
+endchoice
+
+config DMI
+ bool "Enable DMI scanning"
+ select DMI_SCAN_MACHINE_NON_EFI_FALLBACK
+ default y
+ help
+ Enabled scanning of DMI to identify machine quirks. Say Y
+ here unless you have verified that your setup is not
+ affected by entries in the DMI blacklist. Required by PNP
+ BIOS code.
+
+config EFI
+ bool "EFI runtime service support"
+ select UCS2_STRING
+ select EFI_RUNTIME_WRAPPERS
+ help
+ This enables the kernel to use EFI runtime services that are
+ available (such as the EFI variable services).
+
+ This option is only useful on systems that have EFI firmware.
+ In addition, you should use the latest ELILO loader available
+ at <http://elilo.sourceforge.net> in order to take advantage
+ of EFI runtime services. However, even with this option, the
+ resultant kernel should continue to boot on existing non-EFI
+ platforms.
+
+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_MEMORY_HOTPLUG
+ def_bool y
+
+config ARCH_ENABLE_MEMORY_HOTREMOVE
+ def_bool y
+ depends on MEMORY_HOTPLUG
+
+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
+
+config ZONE_DMA
+ bool
+
+config ZONE_DMA32
+ bool
+
+menu "Bus options"
+
+endmenu
+
+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..86c7eadc73ae
--- /dev/null
+++ b/arch/loongarch/Makefile
@@ -0,0 +1,122 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Author: Huacai Chen <[email protected]>
+# Copyright (C) 2020-2021 Loongson Technology Corporation Limited
+
+#
+# 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
+
+cflags-y += $(call cc-option, -mno-check-zero-division)
+
+ifdef CONFIG_64BIT
+ld-emul = $(64bit-emul)
+cflags-y += -mabi=lp64
+endif
+
+all-y := vmlinux
+
+#
+# GCC uses -G 0 -mabicalls -fpic as default. We don't want PIC in the kernel
+# code since it only slows down the whole thing. At some point we might make
+# use of global pointer optimizations but their use of $r2 conflicts with
+# the current pointer optimization.
+#
+cflags-y += -G 0 -pipe
+cflags-y += -msoft-float
+LDFLAGS_vmlinux += -G 0 -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 += -fno-plt -Wa,-mla-global-with-abs,-mla-local-with-abs
+
+cflags-y += -ffreestanding
+
+# Some distribution-specific toolchains might pass the -fstack-check
+# option during the build, which adds a simple stack-probe at the beginning
+# of every function. This stack probe is to ensure that there is enough
+# stack space, else a SEGV is generated. This is not desirable for LoongArch
+# as kernel stacks are small, placed in unmapped virtual memory, and do not
+# grow when overflowed.
+#
+cflags-y += -fno-stack-check
+
+cflags-y += $(call as-option,-Wa$(comma)-mno-fix-loongson3-llsc,)
+cflags-y += -U_LOONGARCH_ISA -D_LOONGARCH_ISA=_LOONGARCH_ISA_LOONGARCH64
+
+load-y = 0x9000000000200000
+
+drivers-$(CONFIG_PCI) += arch/loongarch/pci/
+
+KBUILD_AFLAGS += $(cflags-y)
+KBUILD_CFLAGS += $(cflags-y)
+KBUILD_CPPFLAGS += -DVMLINUX_LOAD_ADDRESS=$(load-y)
+
+bootvars-y = VMLINUX_LOAD_ADDRESS=$(load-y) PLATFORM="$(platform-y)"
+
+ifdef CONFIG_64BIT
+bootvars-y += ADDR_BITS=64
+endif
+
+# 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
+
+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/
+
+prepare: vdso_prepare
+vdso_prepare: prepare0
+ $(Q)$(MAKE) $(build)=arch/loongarch/vdso include/generated/vdso-offsets.h
+
+PHONY += vdso_install
+vdso_install:
+ $(Q)$(MAKE) $(build)=arch/loongarch/vdso $@
+
+# boot image targets (arch/loongarch/boot/)
+boot-y := vmlinux.bin
+
+all: $(all-y)
+
+# boot
+$(boot-y): vmlinux FORCE
+ $(Q)$(MAKE) $(build)=arch/loongarch/boot VMLINUX=vmlinux \
+ $(bootvars-y) arch/loongarch/boot/$@
+
+CLEAN_FILES += vmlinux
+
+install:
+ $(Q)install -D -m 755 vmlinux $(INSTALL_PATH)/vmlinux-$(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 $(INSTALL_PATH)'
+ echo ' vmlinux.bin - Raw binary boot image'
+ echo
+endef
diff --git a/arch/loongarch/include/asm/Kbuild b/arch/loongarch/include/asm/Kbuild
new file mode 100644
index 000000000000..41a76e675321
--- /dev/null
+++ b/arch/loongarch/include/asm/Kbuild
@@ -0,0 +1,31 @@
+# SPDX-License-Identifier: GPL-2.0
+generic-y += dma-contiguous.h
+generic-y += export.h
+generic-y += mcs_spinlock.h
+generic-y += parport.h
+generic-y += early_ioremap.h
+generic-y += qrwlock.h
+generic-y += qspinlock.h
+generic-y += rwsem.h
+generic-y += segment.h
+generic-y += user.h
+generic-y += rwsem.h
+generic-y += stat.h
+generic-y += fcntl.h
+generic-y += ioctl.h
+generic-y += ioctls.h
+generic-y += mman.h
+generic-y += msgbuf.h
+generic-y += sembuf.h
+generic-y += shmbuf.h
+generic-y += statfs.h
+generic-y += socket.h
+generic-y += sockios.h
+generic-y += termios.h
+generic-y += termbits.h
+generic-y += poll.h
+generic-y += param.h
+generic-y += posix_types.h
+generic-y += resource.h
+generic-y += seccomp.h
+generic-y += kvm_para.h
diff --git a/arch/loongarch/include/uapi/asm/Kbuild b/arch/loongarch/include/uapi/asm/Kbuild
new file mode 100644
index 000000000000..4aa680ca2e5f
--- /dev/null
+++ b/arch/loongarch/include/uapi/asm/Kbuild
@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0
+generic-y += kvm_para.h
diff --git a/arch/loongarch/kernel/Makefile b/arch/loongarch/kernel/Makefile
new file mode 100644
index 000000000000..9af33727664d
--- /dev/null
+++ b/arch/loongarch/kernel/Makefile
@@ -0,0 +1,22 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for the Linux/LoongArch kernel.
+#
+
+extra-y := head.o vmlinux.lds
+
+obj-y += cpu-probe.o cacheinfo.o cmdline.o env.o setup.o entry.o genex.o \
+ traps.o irq.o idle.o process.o dma.o mem.o io.o reset.o switch.o \
+ elf.o rtc.o syscall.o signal.o time.o topology.o cmpxchg.o \
+ ptrace.o vdso.o
+
+obj-$(CONFIG_ACPI) += acpi.o
+obj-$(CONFIG_EFI) += efi.o
+
+obj-$(CONFIG_CPU_HAS_FPU) += fpu.o
+
+obj-$(CONFIG_MODULES) += module.o
+
+obj-$(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..3ae212100de5
--- /dev/null
+++ b/arch/loongarch/kernel/vmlinux.lds.S
@@ -0,0 +1,112 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#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>
+
+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;
+ /* Read-only */
+ _text = .; /* Text and read-only data */
+ .text : {
+ TEXT_TEXT
+ SCHED_TEXT
+ CPUIDLE_TEXT
+ LOCK_TEXT
+ KPROBES_TEXT
+ IRQENTRY_TEXT
+ SOFTIRQENTRY_TEXT
+ *(.fixup)
+ *(.gnu.warning)
+ } :text = 0
+ _etext = .; /* End of text section */
+
+ EXCEPTION_TABLE(16)
+
+ _sdata = .; /* Start of data section */
+ RO_DATA(4096)
+ RW_DATA(1 << CONFIG_L1_CACHE_SHIFT, PAGE_SIZE, THREAD_SIZE)
+
+ /* We want the small data sections together, so single-instruction offsets
+ can access them all, and initialized data all before uninitialized, so
+ we can shorten the on-disk segment size. */
+ .sdata : {
+ *(.sdata)
+ }
+ _edata = .; /* End of data section */
+
+ /* Will be freed after init */
+ . = ALIGN(PAGE_SIZE); /* Init code and data */
+ __init_begin = .;
+ INIT_TEXT_SECTION(PAGE_SIZE)
+ INIT_DATA_SECTION(16)
+
+ . = ALIGN(4);
+
+ /* .exit.text is discarded at runtime, not link time, to deal with
+ * references from .rodata
+ */
+ .exit.text : {
+ EXIT_TEXT
+ }
+ .exit.data : {
+ EXIT_DATA
+ }
+
+ /*
+ * Align to 64K in attempt to eliminate holes before the
+ * .bss..swapper_pg_dir section at the start of .bss. This
+ * also satisfies PAGE_SIZE alignment as the largest page size
+ * allowed is 64K.
+ */
+ . = ALIGN(0x10000);
+ __init_end = .;
+ /* freed after init ends here */
+
+ /*
+ * Force .bss to 64K alignment so that .bss..swapper_pg_dir
+ * gets that alignment. .sbss should be empty, so there will be
+ * no holes after __init_end. */
+ BSS_SECTION(0, 0x10000, 8)
+
+ _end = . ;
+
+ STABS_DEBUG
+ DWARF_DEBUG
+
+ /* These must appear regardless of . */
+ .gptab.sdata : {
+ *(.gptab.data)
+ *(.gptab.sdata)
+ }
+ .gptab.sbss : {
+ *(.gptab.bss)
+ *(.gptab.sbss)
+ }
+
+ /* Sections to be discarded */
+ 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..7f32f3e4a6ec
--- /dev/null
+++ b/arch/loongarch/lib/Makefile
@@ -0,0 +1,7 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for LoongArch-specific library files..
+#
+
+lib-y += delay.o memset.o memcpy.o memmove.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/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
On Fri, Sep 17, 2021 at 5:57 AM Huacai Chen <[email protected]>
wrote:> --- /dev/null
> +++ b/arch/loongarch/.gitignore
> @@ -0,0 +1,9 @@
> +*.lds
> +*.raw
> +calc_vmlinuz_load_addr
> +elf-entry
> +relocs
> +vmlinux.*
> +vmlinuz.*
> +
> +!kernel/vmlinux.lds.S
Can you double-check that 'make clean' and/or 'make mrproper' remove all the
generated files? This may already be the case, but I don't see how this is
done in your Makefile
> +
> +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 virtual memory address
> + space bits 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 39 bits of application virtual memory.
> + ...
Nice, this choice statement looks a lot better than the version you had before.
> +
> +cflags-y += -ffreestanding
I had not noticed this previously, but I think this should not be used here,
as -ffreestanding disables a number of optimizations for compiler builtins.
Did you just copy this from MIPS or do you have a particular reason this
is used here?
> +# Some distribution-specific toolchains might pass the -fstack-check
> +# option during the build, which adds a simple stack-probe at the beginning
> +# of every function. This stack probe is to ensure that there is enough
> +# stack space, else a SEGV is generated. This is not desirable for LoongArch
> +# as kernel stacks are small, placed in unmapped virtual memory, and do not
> +# grow when overflowed.
> +#
> +cflags-y += -fno-stack-check
This is already set in the global Makefile and can be removed as well
> +cflags-y += $(call as-option,-Wa$(comma)-mno-fix-loongson3-llsc,)
> +cflags-y += -U_LOONGARCH_ISA -D_LOONGARCH_ISA=_LOONGARCH_ISA_LOONGARCH64
> +
> +load-y = 0x9000000000200000
> +
> +drivers-$(CONFIG_PCI) += arch/loongarch/pci/
> +
> +KBUILD_AFLAGS += $(cflags-y)
> +KBUILD_CFLAGS += $(cflags-y)
> +KBUILD_CPPFLAGS += -DVMLINUX_LOAD_ADDRESS=$(load-y)
> +
> +bootvars-y = VMLINUX_LOAD_ADDRESS=$(load-y) PLATFORM="$(platform-y)"
I would argue that VMLINUX_LOAD_ADDRESS should not be configurable
here, instead all kernels should use the same value.
> diff --git a/arch/loongarch/include/asm/Kbuild b/arch/loongarch/include/asm/Kbuild
> new file mode 100644
> index 000000000000..41a76e675321
> --- /dev/null
> +++ b/arch/loongarch/include/asm/Kbuild
> @@ -0,0 +1,31 @@
> +# SPDX-License-Identifier: GPL-2.0
> +generic-y += dma-contiguous.h
> +generic-y += export.h
> +generic-y += mcs_spinlock.h
> +generic-y += parport.h
> +generic-y += early_ioremap.h
> +generic-y += qrwlock.h
> +generic-y += qspinlock.h
The list is apparently from an older kernel and no longer needed for
files that are listed in include/asm-generic/Kbuild.
Please only list the files that are not already there.
Arnd
Hi, Arnd,
On Fri, Sep 17, 2021 at 3:53 PM Arnd Bergmann <[email protected]> wrote:
>
> On Fri, Sep 17, 2021 at 5:57 AM Huacai Chen <[email protected]>
> wrote:> --- /dev/null
> > +++ b/arch/loongarch/.gitignore
> > @@ -0,0 +1,9 @@
> > +*.lds
> > +*.raw
> > +calc_vmlinuz_load_addr
> > +elf-entry
> > +relocs
> > +vmlinux.*
> > +vmlinuz.*
> > +
> > +!kernel/vmlinux.lds.S
>
> Can you double-check that 'make clean' and/or 'make mrproper' remove all the
> generated files? This may already be the case, but I don't see how this is
> done in your Makefile
The files listed in .gitignore are not generated by the current series
(except vmlinux, but it is cleaned, of course). Most of them are
generated by the zboot patch (not in this series). So, should I keep
the .gitignore file as is, or remove it at present?
>
> > +
> > +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 virtual memory address
> > + space bits 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 39 bits of application virtual memory.
> > + ...
>
> Nice, this choice statement looks a lot better than the version you had before.
>
> > +
> > +cflags-y += -ffreestanding
>
> I had not noticed this previously, but I think this should not be used here,
> as -ffreestanding disables a number of optimizations for compiler builtins.
>
> Did you just copy this from MIPS or do you have a particular reason this
> is used here?
If we use zboot (compressed kernel), there are some conflicting if
without -ffrestanding. E.g., the built-in malloc() conflicts with the
one defined in ./include/linux/decompress/mm.h.
>
> > +# Some distribution-specific toolchains might pass the -fstack-check
> > +# option during the build, which adds a simple stack-probe at the beginning
> > +# of every function. This stack probe is to ensure that there is enough
> > +# stack space, else a SEGV is generated. This is not desirable for LoongArch
> > +# as kernel stacks are small, placed in unmapped virtual memory, and do not
> > +# grow when overflowed.
> > +#
> > +cflags-y += -fno-stack-check
>
> This is already set in the global Makefile and can be removed as well
OK, this will be removed.
>
> > +cflags-y += $(call as-option,-Wa$(comma)-mno-fix-loongson3-llsc,)
> > +cflags-y += -U_LOONGARCH_ISA -D_LOONGARCH_ISA=_LOONGARCH_ISA_LOONGARCH64
> > +
> > +load-y = 0x9000000000200000
> > +
> > +drivers-$(CONFIG_PCI) += arch/loongarch/pci/
> > +
> > +KBUILD_AFLAGS += $(cflags-y)
> > +KBUILD_CFLAGS += $(cflags-y)
> > +KBUILD_CPPFLAGS += -DVMLINUX_LOAD_ADDRESS=$(load-y)
> > +
> > +bootvars-y = VMLINUX_LOAD_ADDRESS=$(load-y) PLATFORM="$(platform-y)"
>
> I would argue that VMLINUX_LOAD_ADDRESS should not be configurable
> here, instead all kernels should use the same value.
VMLINUX_LOAD_ADDRESS is not configurable, it is also used by the later
zboot patch (use VMLINUX_LOAD_ADDRESS to calculate the load address of
vmlinuz).
>
> > diff --git a/arch/loongarch/include/asm/Kbuild b/arch/loongarch/include/asm/Kbuild
> > new file mode 100644
> > index 000000000000..41a76e675321
> > --- /dev/null
> > +++ b/arch/loongarch/include/asm/Kbuild
> > @@ -0,0 +1,31 @@
> > +# SPDX-License-Identifier: GPL-2.0
> > +generic-y += dma-contiguous.h
> > +generic-y += export.h
> > +generic-y += mcs_spinlock.h
> > +generic-y += parport.h
> > +generic-y += early_ioremap.h
> > +generic-y += qrwlock.h
> > +generic-y += qspinlock.h
>
> The list is apparently from an older kernel and no longer needed for
> files that are listed in include/asm-generic/Kbuild.
>
> Please only list the files that are not already there.
Emmm, I have checked include/asm-generic/Kbuild and no duplication,
but I've found a self duplication (rwsem.h), thanks.
Huacai
>
> Arnd