LoongArch is a new RISC ISA, which is a bit like MIPS or RISC-V.
LoongArch includes a reduced 32-bit version (LA32R), a standard 32-bit
version (LA32S) and a 64-bit version (LA64). LoongArch use ACPI as its
boot protocol LoongArch-specific interrupt controllers (similar to APIC)
are already added in the next revision of ACPI Specification (current
revision is 6.4).

This patchset is adding basic LoongArch support in mainline kernel, we
can see a complete snapshot here:
https://github.com/loongson/linux/tree/loongarch-next
https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson.git/log/?h=loongarch-next

Cross-compile tool chain to build kernel:
https://github.com/loongson/build-tools/releases/download/2021.12.21/loongarch64-clfs-2022-03-03-cross-tools-gcc-glibc.tar.xz

A CLFS-based Linux distro:
https://github.com/loongson/build-tools/releases/download/2021.12.21/loongarch64-clfs-system-2022-03-03.tar.bz2

Open-source tool chain which is under review (Binutils and Gcc are already upstream):
https://github.com/loongson/binutils-gdb/tree/upstream_v3.1
https://github.com/loongson/gcc/tree/loongarch_upstream_v6.3
https://github.com/loongson/glibc/tree/loongarch_2_35_dev_v2.2

Loongson and LoongArch documentations:
https://github.com/loongson/LoongArch-Documentation

LoongArch-specific interrupt controllers:
https://mantis.uefi.org/mantis/view.php?id=2203
https://mantis.uefi.org/mantis/view.php?id=2313

V1 -> V2:
1, Add documentation patches;
2, Restore copyright statements;
3, Split the big header patch;
4, Cleanup signal-related headers;
5, Cleanup incomplete 32-bit support;
6, Move the major PCI work to drivers/pci;
7, Rework Loongson64 platform support;
8, Rework lpj and __udelay()/__ndelay();
9, Rework page table layout config options;
10, Rework syscall/exception/interrupt with generic entry framework;
11, Simplify the VDSO/VSYSCALL implementation;
12, Use generic I/O access macros and functions;
13, Remove unaligned access emulation at present;
14, Keep clocksource code in arch since it is the "native clocksource";
15, Some other minor fixes and improvements.

V2 -> V3:
1, Rebased on 5.15-rc1;
2, Cleanup PCI code on V2;
3, Support multiple msi domain;
4, Support cacheable ioremap();
5, Use irq stack for interrupt handling;
6, Adjust struct ucontext and rt_sigframe;
7, Some other minor fixes and improvements.

V3 -> V4:
1, Rebased on 5.15-rc3;
2, Rework SMP support and remove legacy IPI;
3, Rework signal support and remove loongarch_abi;
4, Simplify phys_to_dma() and dma_to_phys();
5, Remove unused sys_mmap2() implementation;
6, Remove unused strncpy_user.S and strnlen_user.S; 
7, Some other minor fixes and improvements.

V4 -> V5:
1, Rebased on 5.15-rc4;
2, Fix a _PAGE_CHG_MASK bug;
3, Fix vdso_base() calculation;
4, Adjust syscall and ptrace code;
5, Use generic bitops implementation;
6, Avoid syscall restart handling in sys_rt_sigreturn();
7, Update commit messages.

V5 -> V6:
1, Rebased on 5.17-rc4;
2, Use GENERIC_IRQ_MIGRATION;
3, Improve sigcontext definition; 
4, Improve numa_default_distance(); 
5, Increse MINSIGSTKSZ and SIGSTKSZ;
6, Restruct pt_regs and user_pt_regs;
7, Fix a corner case of protection_map;
8, Fix some corner cases of system calls;
9, Separate module region and vmalloc region;
10, Rename registers to match official documents.

V6 -> V7:
1, Rebased on 5.17-rc6;
2, Refactor do_page_fault();
3, Adjust memblock initialization;
4, Use -mstrict-align to build kernel;
5, Reimplement elf_read_implies_exec() as other archs;
6, Some other minor fixes and improvements.

V7 -> V8:
1, Rebased on 5.17-rc8;
2, Remove useless abidefs.h;
3, Remove useless HAVE_ARCH_NODEDATA_EXTENSION;
4, Fix and simplify uaccess.h;
5, Fix bugs after pt_regs restruction;
6, Use generic copy_from_user_page()/copy_to_user_page();
7, Some other minor fixes and improvements.

V8 -> V9:
1, Rebased on 5.18-rc4;
2, Fix 4-level page tables;
3, Always use 16KB kernel stack;
4, Add efistub and zboot support;
5, Remove useless HAVE_FUTEX_CMPXCHG;
6, Optimize module machanism for size;
7, Define copy_user_page() to avoid build errors;
8, Some other minor fixes and improvements.

V9 -> V10:
1, Rebased on 5.18-rc6;
2, Use generic efi stub;
3, Use generic string library;
4, Use generic ticket spinlock;
5, Use more meaningful macro naming;
6, Remove the zboot patch;
7, Fix commit message and documentations;
8, Some other minor fixes and improvements.

V10 -> V11:
1, Rebased on asm-generic tree;
2, Fix fpreg macros definition;
3, Fix ELF ABI macros definition;
4, Fix magic number definition in efi header;
5, Remove unneeded swab.h, bitfield.h and rtc.c;
6, Remove __ARCH_WANT_NEW_STAT (glibc need update);
7, Improve documents as WANG Xuerui suggested;
8, Some other minor fixes and improvements.

V11 -> V12:
1, Rebased on mainline;
2, Remove ACPI, PCI and IRQCHIP dependency;
3, Remove unneeded register_gop_device();
4, Fix show_code() and __arch_get_hw_counter();
5, Add a MAINTAINERS entry;
6, Rewrite documents as WANG Xuerui suggested;
7, Some other small adjustment.

Huacai Chen(24):
 irqchip: Adjust Kconfig for Loongson.
 irqchip/loongson-liointc: Fix build error for LoongArch. 
 Documentation: LoongArch: Add basic documentations.
 Documentation/zh_CN: Add basic LoongArch documentations.
 LoongArch: Add elf-related definitions.
 LoongArch: Add writecombine support for drm.
 LoongArch: Add build infrastructure.
 LoongArch: Add CPU definition headers.
 LoongArch: Add atomic/locking headers.
 LoongArch: Add other common headers.
 LoongArch: Add boot and setup routines.
 LoongArch: Add exception/interrupt handling. 
 LoongArch: Add process management.
 LoongArch: Add memory management.
 LoongArch: Add system call support.
 LoongArch: Add signal handling support.
 LoongArch: Add elf and module support.
 LoongArch: Add misc common routines.
 LoongArch: Add some library functions.
 LoongArch: Add PCI controller support.
 LoongArch: Add VDSO and VSYSCALL support.
 LoongArch: Add multi-processor (SMP) support.
 LoongArch: Add Non-Uniform Memory Access (NUMA) support.
 LoongArch: Add Loongson-3 default config file.

Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
---
 Documentation/arch.rst                             |    1 +
 Documentation/loongarch/features.rst               |    3 +
 Documentation/loongarch/index.rst                  |   21 +
 Documentation/loongarch/introduction.rst           |  387 +++++
 Documentation/loongarch/irq-chip-model.rst         |  168 +++
 Documentation/translations/zh_CN/index.rst         |    1 +
 .../translations/zh_CN/loongarch/features.rst      |    8 +
 .../translations/zh_CN/loongarch/index.rst         |   26 +
 .../translations/zh_CN/loongarch/introduction.rst  |  351 +++++
 .../zh_CN/loongarch/irq-chip-model.rst             |  167 +++
 MAINTAINERS                                        |   10 +
 arch/loongarch/Kbuild                              |    6 +
 arch/loongarch/Kconfig                             |  447 ++++++
 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/configs/loongson3_defconfig         |  771 ++++++++++
 arch/loongarch/include/asm/Kbuild                  |   30 +
 arch/loongarch/include/asm/acenv.h                 |   18 +
 arch/loongarch/include/asm/acpi.h                  |   38 +
 arch/loongarch/include/asm/addrspace.h             |  112 ++
 arch/loongarch/include/asm/asm-offsets.h           |    5 +
 arch/loongarch/include/asm/asm-prototypes.h        |    7 +
 arch/loongarch/include/asm/asm.h                   |  191 +++
 arch/loongarch/include/asm/asmmacro.h              |  289 ++++
 arch/loongarch/include/asm/atomic.h                |  362 +++++
 arch/loongarch/include/asm/barrier.h               |  159 ++
 arch/loongarch/include/asm/bitops.h                |   33 +
 arch/loongarch/include/asm/bitrev.h                |   34 +
 arch/loongarch/include/asm/bootinfo.h              |   43 +
 arch/loongarch/include/asm/branch.h                |   21 +
 arch/loongarch/include/asm/bug.h                   |   23 +
 arch/loongarch/include/asm/cache.h                 |   13 +
 arch/loongarch/include/asm/cacheflush.h            |   80 ++
 arch/loongarch/include/asm/cacheops.h              |   37 +
 arch/loongarch/include/asm/clocksource.h           |   12 +
 arch/loongarch/include/asm/cmpxchg.h               |  123 ++
 arch/loongarch/include/asm/compiler.h              |   15 +
 arch/loongarch/include/asm/cpu-features.h          |   73 +
 arch/loongarch/include/asm/cpu-info.h              |  116 ++
 arch/loongarch/include/asm/cpu.h                   |  127 ++
 arch/loongarch/include/asm/cpufeature.h            |   24 +
 arch/loongarch/include/asm/delay.h                 |   26 +
 arch/loongarch/include/asm/dma-direct.h            |   11 +
 arch/loongarch/include/asm/dmi.h                   |   24 +
 arch/loongarch/include/asm/efi.h                   |   41 +
 arch/loongarch/include/asm/elf.h                   |  301 ++++
 arch/loongarch/include/asm/entry-common.h          |   13 +
 arch/loongarch/include/asm/exec.h                  |   10 +
 arch/loongarch/include/asm/fb.h                    |   23 +
 arch/loongarch/include/asm/fixmap.h                |   13 +
 arch/loongarch/include/asm/fpregdef.h              |   53 +
 arch/loongarch/include/asm/fpu.h                   |  129 ++
 arch/loongarch/include/asm/futex.h                 |  108 ++
 arch/loongarch/include/asm/hardirq.h               |   26 +
 arch/loongarch/include/asm/hugetlb.h               |   83 ++
 arch/loongarch/include/asm/hw_irq.h                |   17 +
 arch/loongarch/include/asm/idle.h                  |    9 +
 arch/loongarch/include/asm/inst.h                  |  117 ++
 arch/loongarch/include/asm/io.h                    |  129 ++
 arch/loongarch/include/asm/irq.h                   |  132 ++
 arch/loongarch/include/asm/irq_regs.h              |   27 +
 arch/loongarch/include/asm/irqflags.h              |   78 +
 arch/loongarch/include/asm/kdebug.h                |   23 +
 arch/loongarch/include/asm/linkage.h               |   36 +
 arch/loongarch/include/asm/local.h                 |  138 ++
 arch/loongarch/include/asm/loongarch.h             | 1516 ++++++++++++++++++++
 arch/loongarch/include/asm/loongson.h              |  153 ++
 arch/loongarch/include/asm/mmu.h                   |   16 +
 arch/loongarch/include/asm/mmu_context.h           |  152 ++
 arch/loongarch/include/asm/mmzone.h                |   18 +
 arch/loongarch/include/asm/module.h                |   80 ++
 arch/loongarch/include/asm/module.lds.h            |    7 +
 arch/loongarch/include/asm/numa.h                  |   69 +
 arch/loongarch/include/asm/page.h                  |  115 ++
 arch/loongarch/include/asm/percpu.h                |  214 +++
 arch/loongarch/include/asm/perf_event.h            |   10 +
 arch/loongarch/include/asm/pgalloc.h               |  103 ++
 arch/loongarch/include/asm/pgtable-bits.h          |  131 ++
 arch/loongarch/include/asm/pgtable.h               |  565 ++++++++
 arch/loongarch/include/asm/prefetch.h              |   29 +
 arch/loongarch/include/asm/processor.h             |  209 +++
 arch/loongarch/include/asm/ptrace.h                |  152 ++
 arch/loongarch/include/asm/reboot.h                |   10 +
 arch/loongarch/include/asm/regdef.h                |   41 +
 arch/loongarch/include/asm/seccomp.h               |   20 +
 arch/loongarch/include/asm/serial.h                |   11 +
 arch/loongarch/include/asm/setup.h                 |   21 +
 arch/loongarch/include/asm/shmparam.h              |   12 +
 arch/loongarch/include/asm/smp.h                   |  124 ++
 arch/loongarch/include/asm/sparsemem.h             |   23 +
 arch/loongarch/include/asm/stackframe.h            |  219 +++
 arch/loongarch/include/asm/stacktrace.h            |   74 +
 arch/loongarch/include/asm/string.h                |   12 +
 arch/loongarch/include/asm/switch_to.h             |   37 +
 arch/loongarch/include/asm/syscall.h               |   74 +
 arch/loongarch/include/asm/thread_info.h           |  106 ++
 arch/loongarch/include/asm/time.h                  |   50 +
 arch/loongarch/include/asm/timex.h                 |   33 +
 arch/loongarch/include/asm/tlb.h                   |  180 +++
 arch/loongarch/include/asm/tlbflush.h              |   48 +
 arch/loongarch/include/asm/topology.h              |   41 +
 arch/loongarch/include/asm/types.h                 |   19 +
 arch/loongarch/include/asm/uaccess.h               |  269 ++++
 arch/loongarch/include/asm/unistd.h                |   11 +
 arch/loongarch/include/asm/vdso.h                  |   38 +
 arch/loongarch/include/asm/vdso/clocksource.h      |    8 +
 arch/loongarch/include/asm/vdso/gettimeofday.h     |   99 ++
 arch/loongarch/include/asm/vdso/processor.h        |   14 +
 arch/loongarch/include/asm/vdso/vdso.h             |   30 +
 arch/loongarch/include/asm/vdso/vsyscall.h         |   27 +
 arch/loongarch/include/asm/vermagic.h              |   19 +
 arch/loongarch/include/asm/vmalloc.h               |    4 +
 arch/loongarch/include/uapi/asm/Kbuild             |    2 +
 arch/loongarch/include/uapi/asm/auxvec.h           |   17 +
 arch/loongarch/include/uapi/asm/bitsperlong.h      |    9 +
 arch/loongarch/include/uapi/asm/break.h            |   23 +
 arch/loongarch/include/uapi/asm/byteorder.h        |   13 +
 arch/loongarch/include/uapi/asm/hwcap.h            |   20 +
 arch/loongarch/include/uapi/asm/ptrace.h           |   52 +
 arch/loongarch/include/uapi/asm/reg.h              |   59 +
 arch/loongarch/include/uapi/asm/sigcontext.h       |   44 +
 arch/loongarch/include/uapi/asm/signal.h           |   13 +
 arch/loongarch/include/uapi/asm/ucontext.h         |   35 +
 arch/loongarch/include/uapi/asm/unistd.h           |    5 +
 arch/loongarch/kernel/.gitignore                   |    2 +
 arch/loongarch/kernel/Makefile                     |   25 +
 arch/loongarch/kernel/access-helper.h              |   13 +
 arch/loongarch/kernel/acpi.c                       |  333 +++++
 arch/loongarch/kernel/asm-offsets.c                |  264 ++++
 arch/loongarch/kernel/cacheinfo.c                  |  122 ++
 arch/loongarch/kernel/cpu-probe.c                  |  292 ++++
 arch/loongarch/kernel/dma.c                        |   40 +
 arch/loongarch/kernel/efi-header.S                 |  104 ++
 arch/loongarch/kernel/efi.c                        |  226 +++
 arch/loongarch/kernel/elf.c                        |   30 +
 arch/loongarch/kernel/entry.S                      |   89 ++
 arch/loongarch/kernel/env.c                        |   70 +
 arch/loongarch/kernel/fpu.S                        |  261 ++++
 arch/loongarch/kernel/genex.S                      |   95 ++
 arch/loongarch/kernel/head.S                       |  129 ++
 arch/loongarch/kernel/idle.c                       |   16 +
 arch/loongarch/kernel/image-vars.h                 |   29 +
 arch/loongarch/kernel/inst.c                       |   40 +
 arch/loongarch/kernel/io.c                         |   94 ++
 arch/loongarch/kernel/irq.c                        |   88 ++
 arch/loongarch/kernel/mem.c                        |   64 +
 arch/loongarch/kernel/module-sections.c            |  121 ++
 arch/loongarch/kernel/module.c                     |  375 +++++
 arch/loongarch/kernel/numa.c                       |  466 ++++++
 arch/loongarch/kernel/proc.c                       |  127 ++
 arch/loongarch/kernel/process.c                    |  267 ++++
 arch/loongarch/kernel/ptrace.c                     |  431 ++++++
 arch/loongarch/kernel/reset.c                      |  102 ++
 arch/loongarch/kernel/setup.c                      |  374 +++++
 arch/loongarch/kernel/signal.c                     |  566 ++++++++
 arch/loongarch/kernel/smp.c                        |  751 ++++++++++
 arch/loongarch/kernel/switch.S                     |   35 +
 arch/loongarch/kernel/syscall.c                    |   63 +
 arch/loongarch/kernel/time.c                       |  214 +++
 arch/loongarch/kernel/topology.c                   |   52 +
 arch/loongarch/kernel/traps.c                      |  725 ++++++++++
 arch/loongarch/kernel/vdso.c                       |  138 ++
 arch/loongarch/kernel/vmlinux.lds.S                |  121 ++
 arch/loongarch/lib/Makefile                        |    6 +
 arch/loongarch/lib/clear_user.S                    |   43 +
 arch/loongarch/lib/copy_user.S                     |   47 +
 arch/loongarch/lib/delay.c                         |   43 +
 arch/loongarch/lib/dump_tlb.c                      |  111 ++
 arch/loongarch/mm/Makefile                         |    9 +
 arch/loongarch/mm/cache.c                          |  141 ++
 arch/loongarch/mm/extable.c                        |   22 +
 arch/loongarch/mm/fault.c                          |  261 ++++
 arch/loongarch/mm/hugetlbpage.c                    |   87 ++
 arch/loongarch/mm/init.c                           |  178 +++
 arch/loongarch/mm/ioremap.c                        |   27 +
 arch/loongarch/mm/maccess.c                        |   10 +
 arch/loongarch/mm/mmap.c                           |  125 ++
 arch/loongarch/mm/page.S                           |   84 ++
 arch/loongarch/mm/pgtable.c                        |  130 ++
 arch/loongarch/mm/tlb.c                            |  305 ++++
 arch/loongarch/mm/tlbex.S                          |  546 +++++++
 arch/loongarch/pci/Makefile                        |    7 +
 arch/loongarch/vdso/.gitignore                     |    2 +
 arch/loongarch/vdso/Makefile                       |   96 ++
 arch/loongarch/vdso/elf.S                          |   15 +
 arch/loongarch/vdso/gen_vdso_offsets.sh            |   13 +
 arch/loongarch/vdso/sigreturn.S                    |   24 +
 arch/loongarch/vdso/vdso.S                         |   22 +
 arch/loongarch/vdso/vdso.lds.S                     |   72 +
 arch/loongarch/vdso/vgettimeofday.c                |   25 +
 drivers/firmware/efi/Kconfig                       |    2 +-
 drivers/firmware/efi/libstub/Makefile              |   10 +
 drivers/firmware/efi/libstub/efi-stub-helper.c     |    2 +-
 drivers/firmware/efi/libstub/efi-stub.c            |    2 +-
 drivers/firmware/efi/libstub/loongarch-stub.c      |   88 ++
 drivers/gpu/drm/drm_vm.c                           |    2 +-
 drivers/gpu/drm/ttm/ttm_module.c                   |    2 +-
 drivers/irqchip/Kconfig                            |    6 +-
 drivers/irqchip/irq-loongson-liointc.c             |    6 +-
 include/drm/drm_cache.h                            |    8 +
 include/linux/cpuhotplug.h                         |    1 +
 include/linux/efi.h                                |    1 +
 include/linux/pe.h                                 |    2 +
 include/uapi/linux/audit.h                         |    2 +
 include/uapi/linux/elf-em.h                        |    1 +
 include/uapi/linux/elf.h                           |    5 +
 include/uapi/linux/kexec.h                         |    1 +
 scripts/sorttable.c                                |    5 +
 scripts/subarch.include                            |    2 +-
 tools/include/uapi/asm/bitsperlong.h               |    2 +
 213 files changed, 21500 insertions(+), 10 deletions(-)
 create mode 100644 Documentation/loongarch/features.rst
 create mode 100644 Documentation/loongarch/index.rst
 create mode 100644 Documentation/loongarch/introduction.rst
 create mode 100644 Documentation/loongarch/irq-chip-model.rst
 create mode 100644 Documentation/translations/zh_CN/loongarch/features.rst
 create mode 100644 Documentation/translations/zh_CN/loongarch/index.rst
 create mode 100644 Documentation/translations/zh_CN/loongarch/introduction.rst
 create mode 100644 Documentation/translations/zh_CN/loongarch/irq-chip-model.rst
 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/configs/loongson3_defconfig
 create mode 100644 arch/loongarch/include/asm/Kbuild
 create mode 100644 arch/loongarch/include/asm/acenv.h
 create mode 100644 arch/loongarch/include/asm/acpi.h
 create mode 100644 arch/loongarch/include/asm/addrspace.h
 create mode 100644 arch/loongarch/include/asm/asm-offsets.h
 create mode 100644 arch/loongarch/include/asm/asm-prototypes.h
 create mode 100644 arch/loongarch/include/asm/asm.h
 create mode 100644 arch/loongarch/include/asm/asmmacro.h
 create mode 100644 arch/loongarch/include/asm/atomic.h
 create mode 100644 arch/loongarch/include/asm/barrier.h
 create mode 100644 arch/loongarch/include/asm/bitops.h
 create mode 100644 arch/loongarch/include/asm/bitrev.h
 create mode 100644 arch/loongarch/include/asm/bootinfo.h
 create mode 100644 arch/loongarch/include/asm/branch.h
 create mode 100644 arch/loongarch/include/asm/bug.h
 create mode 100644 arch/loongarch/include/asm/cache.h
 create mode 100644 arch/loongarch/include/asm/cacheflush.h
 create mode 100644 arch/loongarch/include/asm/cacheops.h
 create mode 100644 arch/loongarch/include/asm/clocksource.h
 create mode 100644 arch/loongarch/include/asm/cmpxchg.h
 create mode 100644 arch/loongarch/include/asm/compiler.h
 create mode 100644 arch/loongarch/include/asm/cpu-features.h
 create mode 100644 arch/loongarch/include/asm/cpu-info.h
 create mode 100644 arch/loongarch/include/asm/cpu.h
 create mode 100644 arch/loongarch/include/asm/cpufeature.h
 create mode 100644 arch/loongarch/include/asm/delay.h
 create mode 100644 arch/loongarch/include/asm/dma-direct.h
 create mode 100644 arch/loongarch/include/asm/dmi.h
 create mode 100644 arch/loongarch/include/asm/efi.h
 create mode 100644 arch/loongarch/include/asm/elf.h
 create mode 100644 arch/loongarch/include/asm/entry-common.h
 create mode 100644 arch/loongarch/include/asm/exec.h
 create mode 100644 arch/loongarch/include/asm/fb.h
 create mode 100644 arch/loongarch/include/asm/fixmap.h
 create mode 100644 arch/loongarch/include/asm/fpregdef.h
 create mode 100644 arch/loongarch/include/asm/fpu.h
 create mode 100644 arch/loongarch/include/asm/futex.h
 create mode 100644 arch/loongarch/include/asm/hardirq.h
 create mode 100644 arch/loongarch/include/asm/hugetlb.h
 create mode 100644 arch/loongarch/include/asm/hw_irq.h
 create mode 100644 arch/loongarch/include/asm/idle.h
 create mode 100644 arch/loongarch/include/asm/inst.h
 create mode 100644 arch/loongarch/include/asm/io.h
 create mode 100644 arch/loongarch/include/asm/irq.h
 create mode 100644 arch/loongarch/include/asm/irq_regs.h
 create mode 100644 arch/loongarch/include/asm/irqflags.h
 create mode 100644 arch/loongarch/include/asm/kdebug.h
 create mode 100644 arch/loongarch/include/asm/linkage.h
 create mode 100644 arch/loongarch/include/asm/local.h
 create mode 100644 arch/loongarch/include/asm/loongarch.h
 create mode 100644 arch/loongarch/include/asm/loongson.h
 create mode 100644 arch/loongarch/include/asm/mmu.h
 create mode 100644 arch/loongarch/include/asm/mmu_context.h
 create mode 100644 arch/loongarch/include/asm/mmzone.h
 create mode 100644 arch/loongarch/include/asm/module.h
 create mode 100644 arch/loongarch/include/asm/module.lds.h
 create mode 100644 arch/loongarch/include/asm/numa.h
 create mode 100644 arch/loongarch/include/asm/page.h
 create mode 100644 arch/loongarch/include/asm/percpu.h
 create mode 100644 arch/loongarch/include/asm/perf_event.h
 create mode 100644 arch/loongarch/include/asm/pgalloc.h
 create mode 100644 arch/loongarch/include/asm/pgtable-bits.h
 create mode 100644 arch/loongarch/include/asm/pgtable.h
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--
2.27.0

On 6/1/22 17:59, Huacai Chen wrote:
> <snip>
>
> Huacai Chen(24):
>   irqchip: Adjust Kconfig for Loongson.
>   irqchip/loongson-liointc: Fix build error for LoongArch.
>   Documentation: LoongArch: Add basic documentations.
>   Documentation/zh_CN: Add basic LoongArch documentations.
>   LoongArch: Add elf-related definitions.
>   LoongArch: Add writecombine support for drm.
>   LoongArch: Add build infrastructure.
>   LoongArch: Add CPU definition headers.
>   LoongArch: Add atomic/locking headers.
>   LoongArch: Add other common headers.
>   LoongArch: Add boot and setup routines.
>   LoongArch: Add exception/interrupt handling.
>   LoongArch: Add process management.
>   LoongArch: Add memory management.
>   LoongArch: Add system call support.
>   LoongArch: Add signal handling support.
>   LoongArch: Add elf and module support.
>   LoongArch: Add misc common routines.
>   LoongArch: Add some library functions.
>   LoongArch: Add PCI controller support.
>   LoongArch: Add VDSO and VSYSCALL support.
>   LoongArch: Add multi-processor (SMP) support.
>   LoongArch: Add Non-Uniform Memory Access (NUMA) support.
>   LoongArch: Add Loongson-3 default config file.
>
> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>

I have gone through every of these patches, and they now all look good 
to me. Thanks for all the revisions and cooperation!

I remember several more people have left comments on the v11 code; Eric 
commented on the signal handling bits and Ard may have something to say 
on the UEFI part. The first two cleanup patches to irqchip are 
previously sent in a separate series, and they are already trivial 
enough, but Marc may want to give the ack here too, for the patches to 
go in via the asm-generic tree.

At this time, although the port currently cannot work on any real 
hardware, the value is mostly for unblocking downstream development 
starting from the libc's, as the userspace ABI has been stable for 
several months already and there's probably no point in delaying even 
further. I've been working on the Gentoo/LoongArch port since August 
2021 and experienced every ABI break since then, so I probably know 
enough to make this statement.

I think, with the userspace ABI effectively stable already, and other 
implementation details available for continued improvement, we could 
make it into this merge window after all. People, please take a final 
quick look at this; your opinions and/or review and acks are appreciated.

在2022年6月1日六月 上午10:59，Huacai Chen写道：
> LoongArch is a new RISC ISA, which is a bit like MIPS or RISC-V.
> LoongArch includes a reduced 32-bit version (LA32R), a standard 32-bit
> version (LA32S) and a 64-bit version (LA64). LoongArch use ACPI as its
> boot protocol LoongArch-specific interrupt controllers (similar to APIC)
> are already added in the next revision of ACPI Specification (current
> revision is 6.4).
>

I’ve been reviewing all LA changes in past week and now I’m giving out R-b
for every patch I had reviewed in detail. (I don’t really now anything about
 mm and processes so I just leave them).

I also tried to run the kernel on my machine with Huacai’s next tree and
Xuerui’s BPI patch.

I watched the “New World” of LoongArch grow up from scratch. And I must
say it’s a epic work showing the collaboration between community and Loongson
company. Especially Xuerui who invested numerous days and nights without any
return.

Thanks to all people involved.

- Jiaxun

On Wed, Jun 1, 2022 at 8:44 PM Jiaxun Yang <jiaxun.yang@flygoat.com> wrote:
>
>
>
> 在2022年6月1日六月 上午10:59，Huacai Chen写道：
> > LoongArch is a new RISC ISA, which is a bit like MIPS or RISC-V.
> > LoongArch includes a reduced 32-bit version (LA32R), a standard 32-bit
> > version (LA32S) and a 64-bit version (LA64). LoongArch use ACPI as its
> > boot protocol LoongArch-specific interrupt controllers (similar to APIC)
> > are already added in the next revision of ACPI Specification (current
> > revision is 6.4).
> >
>
> I’ve been reviewing all LA changes in past week and now I’m giving out R-b
> for every patch I had reviewed in detail. (I don’t really now anything about
>  mm and processes so I just leave them).
>
> I also tried to run the kernel on my machine with Huacai’s next tree and
> Xuerui’s BPI patch.
>
> I watched the “New World” of LoongArch grow up from scratch. And I must
> say it’s a epic work showing the collaboration between community and Loongson
> company. Especially Xuerui who invested numerous days and nights without any
> return.
>
> Thanks to all people involved.

Great job, best wishes to all of you.

>
> - Jiaxun
>


-- 
Best Regards
 Guo Ren

ML: https://lore.kernel.org/linux-csky/