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@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,