[PATCH 00/16] LoongArch initial support

Jiaxun Yang jiaxun.yang at flygoat.com
Wed May 22 17:34:43 CEST 2024


Hi all,

Sorry for flooding the mailing list recently, yet another huge RFC series ahead.

So after working on MIPS, arm64be and Xtensa I'm now on LoongArch, as suggested
by Heinrich.

So far this series has implemented general support for initializing CPU,
exceptions, kernel booting, CPU and timer drivers, QEMU LoongArch virt machine
support and UEFI standard compliant EFI booting support.

LoongArch had defined 3 ISA variants, LA64, LA32 and LA32R (Reduced, intended
for MCUs). Currently, only LA64 is implemented as 32bit support in open sourc
 world is not mature yet. However, most of the code is written with 32 bit
support in mind, so it should be trivial to add 32 bit support in the future. 

It is a little endian only architecture.

This series had passed checkpatch with exceptions on some false alarms and
headers imported elsewhere.

I had tested virtio devices, qfw direct kernel booting, efistub kernel
booting and grub.

Toolchain can be found at [1] or using upstream one, I had also discovered a
couple of issues in kernel and QEMU in the porting process, patches
at [2] and [3].

To build:
```
make qemu-loongarch64_defconfig
make
``

To run in QEMU (patched):
```
qemu-system-loongarch64 -nographic -machine virt -bios u-boot.bin
```

TODOs for me on this series:
- Documents
	- I'll write board level document for QEMU,
	  what should I write at architecture level?
- MAINTAINERS entries
	- I'm not sure what I should add here, please suggest!
- Further clean-ups

TODOs on the architecture & board:
- loongson,ls7a-rtc driver
	- The only device on QEMU board haven't been supported yet
- LoongArch sandbox host support
- Implement LoongArch's PE relocations
	- No application is using it so far,
	  pe-format spec is not really clear.
- TLB enablement
	- This is required for real CPU to utilize caches
- Possibly EFI-APP support for real machine

Porting to real SoCs is out of my scope as a hobbyist, I'll try to
convince Loongson people or other hobbyists to work on that.
I intended to use U-Boot as an OVMF replacement and second stage BL.

Any comments are much appreciated!

Thanks

Signed-off-by: Jiaxun Yang <jiaxun.yang at flygoat.com>
---
Jiaxun Yang (16):
      lib: fdtdec: Handle multiple memory nodes
      linux/io.h: Use map_physmem to implement ioremap
      image: Take entry point as an output of setup_booti
      elf.h Define LoongArch bits
      image: Define IH_ARCH_LOONGARCH
      LoongArch: skeleton and headers
      LoongArch: lib: General routines
      LoongArch: CPU assembly routines
      LoongArch: Exception handling
      LoongArch: Boot Image bits
      LoongArch: Generic CPU type
      cpu: Add loongarch_cpu driver
      timer: Add loongarch_timer driver
      board: emulation: Add qemu-loongarch
      efi: LoongArch: Define LoongArch bits everywhere
      efi: LoongArch: Implement everything

 arch/Kconfig                                       |   15 +
 arch/arm/lib/image.c                               |    3 +-
 arch/loongarch/Kconfig                             |   49 +
 arch/loongarch/Makefile                            |   19 +
 arch/loongarch/config.mk                           |   27 +
 arch/loongarch/cpu/Makefile                        |    9 +
 arch/loongarch/cpu/cpu.c                           |   28 +
 arch/loongarch/cpu/generic/Kconfig                 |   13 +
 arch/loongarch/cpu/generic/Makefile                |    7 +
 arch/loongarch/cpu/generic/cpu.c                   |   22 +
 arch/loongarch/cpu/generic/dram.c                  |   21 +
 arch/loongarch/cpu/genex.S                         |   21 +
 arch/loongarch/cpu/smp_secondary.S                 |   55 +
 arch/loongarch/cpu/start.S                         |  169 +++
 arch/loongarch/cpu/u-boot.lds                      |   85 ++
 arch/loongarch/dts/Makefile                        |   13 +
 arch/loongarch/dts/qemu-loongarch64.dts            |    9 +
 arch/loongarch/include/asm/acpi_table.h            |    8 +
 arch/loongarch/include/asm/addrspace.h             |   87 ++
 .../include/asm/arch-generic/entry-init.h          |   15 +
 arch/loongarch/include/asm/asm.h                   |  186 +++
 arch/loongarch/include/asm/atomic.h                |   12 +
 arch/loongarch/include/asm/barrier.h               |  138 ++
 arch/loongarch/include/asm/bitops.h                |  156 +++
 arch/loongarch/include/asm/byteorder.h             |   22 +
 arch/loongarch/include/asm/cache.h                 |   24 +
 arch/loongarch/include/asm/config.h                |   11 +
 arch/loongarch/include/asm/cpu.h                   |  123 ++
 arch/loongarch/include/asm/dma-mapping.h           |   27 +
 arch/loongarch/include/asm/global_data.h           |   43 +
 arch/loongarch/include/asm/gpio.h                  |   11 +
 arch/loongarch/include/asm/io.h                    |  399 ++++++
 arch/loongarch/include/asm/linkage.h               |   11 +
 arch/loongarch/include/asm/loongarch.h             | 1468 ++++++++++++++++++++
 arch/loongarch/include/asm/posix_types.h           |   87 ++
 arch/loongarch/include/asm/processor.h             |   11 +
 arch/loongarch/include/asm/ptrace.h                |   33 +
 arch/loongarch/include/asm/regdef.h                |   42 +
 arch/loongarch/include/asm/sections.h              |    8 +
 arch/loongarch/include/asm/setjmp.h                |   25 +
 arch/loongarch/include/asm/spl.h                   |   11 +
 arch/loongarch/include/asm/stackframe.h            |  175 +++
 arch/loongarch/include/asm/string.h                |   11 +
 arch/loongarch/include/asm/system.h                |   74 +
 arch/loongarch/include/asm/types.h                 |   37 +
 arch/loongarch/include/asm/u-boot-loongarch.h      |   23 +
 arch/loongarch/include/asm/u-boot.h                |   30 +
 arch/loongarch/include/asm/unaligned.h             |   11 +
 arch/loongarch/lib/Makefile                        |   26 +
 arch/loongarch/lib/asm-offsets.c                   |   66 +
 arch/loongarch/lib/boot.c                          |   14 +
 arch/loongarch/lib/bootm.c                         |  177 +++
 arch/loongarch/lib/cache.c                         |   73 +
 arch/loongarch/lib/crt0_loongarch_efi.S            |  182 +++
 arch/loongarch/lib/elf_loongarch_efi.lds           |   76 +
 arch/loongarch/lib/image.c                         |   66 +
 arch/loongarch/lib/interrupts.c                    |  189 +++
 arch/loongarch/lib/reloc_loongarch_efi.c           |  107 ++
 arch/loongarch/lib/reset.c                         |   14 +
 arch/loongarch/lib/setjmp.S                        |   52 +
 arch/riscv/lib/image.c                             |    4 +-
 arch/sandbox/lib/bootm.c                           |    2 +-
 board/emulation/qemu-loongarch/Kconfig             |   68 +
 board/emulation/qemu-loongarch/MAINTAINERS         |    7 +
 board/emulation/qemu-loongarch/Makefile            |    6 +
 board/emulation/qemu-loongarch/qemu-loongarch.c    |   84 ++
 board/emulation/qemu-loongarch/qemu-loongarch.env  |    6 +
 boot/bootm.c                                       |    5 +-
 boot/bootmeth_efi.c                                |    2 +
 boot/image.c                                       |    1 +
 cmd/Kconfig                                        |    2 +-
 cmd/booti.c                                        |    5 +-
 common/spl/spl.c                                   |    9 +-
 configs/qemu-loongarch64_defconfig                 |   36 +
 drivers/cpu/Kconfig                                |    6 +
 drivers/cpu/Makefile                               |    1 +
 drivers/cpu/loongarch_cpu.c                        |  148 ++
 drivers/timer/Kconfig                              |    8 +
 drivers/timer/Makefile                             |    1 +
 drivers/timer/loongarch_timer.c                    |  112 ++
 include/asm-generic/pe.h                           |    2 +
 include/config_distro_bootcmd.h                    |    5 +
 include/configs/qemu-loongarch.h                   |   13 +
 include/efi_default_filename.h                     |    2 +
 include/elf.h                                      |    9 +-
 include/image.h                                    |    4 +-
 include/linux/io.h                                 |    3 +-
 lib/efi_loader/Kconfig                             |    2 +-
 lib/efi_loader/efi_image_loader.c                  |    7 +
 lib/efi_loader/efi_runtime.c                       |    4 +
 lib/efi_selftest/efi_selftest_miniapp_exception.c  |    2 +
 lib/fdtdec.c                                       |  137 +-
 92 files changed, 5559 insertions(+), 70 deletions(-)
---
base-commit: a7f0154c412859323396111dd0c09dbafbc153cb
change-id: 20240522-loongarch-8a04c1e34a47

Best regards,
-- 
Jiaxun Yang <jiaxun.yang at flygoat.com>



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