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Message-ID: <20251118112728.571869-1-chenhuacai@loongson.cn>
Date: Tue, 18 Nov 2025 19:27:14 +0800
From: Huacai Chen <chenhuacai@...ngson.cn>
To: Arnd Bergmann <arnd@...db.de>,
Huacai Chen <chenhuacai@...nel.org>
Cc: loongarch@...ts.linux.dev,
linux-arch@...r.kernel.org,
Xuefeng Li <lixuefeng@...ngson.cn>,
Guo Ren <guoren@...nel.org>,
Xuerui Wang <kernel@...0n.name>,
Jiaxun Yang <jiaxun.yang@...goat.com>,
linux-kernel@...r.kernel.org,
Huacai Chen <chenhuacai@...ngson.cn>,
Yawei Li <liyawei@...ngson.cn>
Subject: [PATCH V2 00/14] LoongArch: Add basic LoongArch32 support
LoongArch includes a reduced 32-bit version (LA32R), a standard 32-bit
version (LA32S) and a 64-bit version (LA64). LoongArch32 use FDT as its
boot protocol which is already supported in LoongArch64. LoongArch32's
ILP32 ABI use the same calling convention as LoongArch64.
This patchset is adding basic LoongArch32 support in mainline kernel, it
is the successor of Jiaxun Yang's previous work (V1):
https://lore.kernel.org/loongarch/20250102-la32-uapi-v1-0-db32aa769b88@flygoat.com/
We can see a complete snapshot here:
https://github.com/chenhuacai/linux/tree/loongarch-next
Cross-compile tool chain to build kernel:
https://github.com/sunhaiyong1978/Yongbao-Embedded/releases/download/0.13-2025.9.3/loongarch32-unknown-linux-gnu-gcc-0.13-20251105.x86_64.tar.xz
A CLFS-based Linux distro (Yongbao):
https://github.com/sunhaiyong1978/Yongbao-Embedded/releases/download/0.13-2025.9.3/loongarch32-Yongbao-Embedded-0.13-20251018-sysroot.tar.xz
Open-source tool chain which is under review (Also in maillist for upstream):
https://github.com/cloudspurs/binutils-gdb/tree/la32/
https://github.com/cloudspurs/gcc/tree/la32/
https://github.com/cloudspurs/glibc/tree/la32/
LA32 QEMU emulator (hardware is not as widely used as LA64):
https://github.com/loongson-community/qemu/tree/la32-user-exp/
Usage:
1. Extract Yongbao to a virtual disk (la32.img);
2. qemu-system-loongarch -kernel vmlinux -append "rw root=/dev/vda console=ttyS0,115200" \
-m 256M -cpu max32 -machine virt,accel=tcg -drive file=la32.img,format=raw,if=virtio -display none -serial stdio
V1 -> V2:
1, Rebased on 6.18-rc6;
2, Port a full runnable kernel (except irqchip drivers);
3, Remove controversial flush_icache syscall for now.
Jiaxun Yang, Yawei Li and Huacai Chen(14):
LoongArch: Add atomic operations for 32BIT/64BIT;
LoongArch: Add adaptive CSR accessors for 32BIT/64BIT;
LoongArch: Adjust common macro definitions for 32BIT/64BIT;
LoongArch: Adjust boot & setup for 32BIT/64BIT;
LoongArch: Adjust memory management for 32BIT/64BIT;
LoongArch: Adjust process management for 32BIT/64BIT;
LoongArch: Adjust time routines for 32BIT/64BIT;
LoongArch: Adjust module loader for 32BIT/64BIT;
LoongArch: Adjust system call for 32BIT/64BIT;
LoongArch: Adjust user accessors for 32BIT/64BIT;
LoongArch: Adjust misc routines for 32BIT/64BIT;
LoongArch: Adjust VDSO/VSYSCALL for 32BIT/64BIT;
LoongArch: Adjust default config files for 32BIT/64BIT;
LoongArch: Adjust build infrastructure for 32BIT/64BIT.
Signed-off-by: Jiaxun Yang <jiaxun.yang@...goat.com>
Signed-off-by: Yawei Li <liyawei@...ngson.cn>
Signed-off-by: Huacai Chen <chenhuacai@...ngson.cn>
---
arch/loongarch/Kconfig | 115 +-
arch/loongarch/Makefile | 29 +-
arch/loongarch/boot/Makefile | 6 +
arch/loongarch/configs/loongson32_defconfig | 1110 ++++++++++++++++++++
.../{loongson3_defconfig => loongson64_defconfig} | 0
arch/loongarch/include/asm/Kbuild | 1 +
arch/loongarch/include/asm/addrspace.h | 15 +-
arch/loongarch/include/asm/asm.h | 77 +-
arch/loongarch/include/asm/asmmacro.h | 117 ++-
arch/loongarch/include/asm/atomic-amo.h | 206 ++++
arch/loongarch/include/asm/atomic-llsc.h | 100 ++
arch/loongarch/include/asm/atomic.h | 197 +---
arch/loongarch/include/asm/checksum.h | 4 +
arch/loongarch/include/asm/cmpxchg.h | 48 +-
arch/loongarch/include/asm/cpu-features.h | 3 -
arch/loongarch/include/asm/elf.h | 1 +
arch/loongarch/include/asm/inst.h | 12 +-
arch/loongarch/include/asm/irq.h | 5 +
arch/loongarch/include/asm/jump_label.h | 12 +-
arch/loongarch/include/asm/local.h | 37 +
arch/loongarch/include/asm/loongarch.h | 100 +-
arch/loongarch/include/asm/module.h | 11 +
arch/loongarch/include/asm/page.h | 2 +-
arch/loongarch/include/asm/percpu.h | 44 +-
arch/loongarch/include/asm/pgtable-bits.h | 36 +-
arch/loongarch/include/asm/pgtable.h | 74 +-
arch/loongarch/include/asm/stackframe.h | 34 +-
arch/loongarch/include/asm/string.h | 2 +
arch/loongarch/include/asm/timex.h | 29 +-
arch/loongarch/include/asm/uaccess.h | 63 +-
arch/loongarch/include/asm/vdso/gettimeofday.h | 4 +
arch/loongarch/include/uapi/asm/Kbuild | 1 +
arch/loongarch/include/uapi/asm/unistd.h | 6 +
arch/loongarch/kernel/Makefile.syscalls | 1 +
arch/loongarch/kernel/cpu-probe.c | 23 +-
arch/loongarch/kernel/efi-header.S | 4 +
arch/loongarch/kernel/efi.c | 4 +-
arch/loongarch/kernel/entry.S | 22 +-
arch/loongarch/kernel/env.c | 9 +-
arch/loongarch/kernel/fpu.S | 111 ++
arch/loongarch/kernel/head.S | 39 +-
arch/loongarch/kernel/module.c | 80 +-
arch/loongarch/kernel/proc.c | 13 +-
arch/loongarch/kernel/process.c | 6 +-
arch/loongarch/kernel/ptrace.c | 5 +
arch/loongarch/kernel/relocate.c | 9 +-
arch/loongarch/kernel/switch.S | 25 +-
arch/loongarch/kernel/syscall.c | 15 +-
arch/loongarch/kernel/time.c | 31 +-
arch/loongarch/kernel/traps.c | 15 +-
arch/loongarch/kernel/unaligned.c | 30 +-
arch/loongarch/kernel/vmlinux.lds.S | 7 +-
arch/loongarch/kvm/Kconfig | 2 +-
arch/loongarch/kvm/vcpu.c | 5 +-
arch/loongarch/lib/Makefile | 5 +-
arch/loongarch/lib/clear_user.S | 22 +-
arch/loongarch/lib/copy_user.S | 28 +-
arch/loongarch/lib/dump_tlb.c | 14 +-
arch/loongarch/lib/unaligned.S | 72 +-
arch/loongarch/mm/init.c | 4 +-
arch/loongarch/mm/page.S | 118 +--
arch/loongarch/mm/tlb.c | 12 +-
arch/loongarch/mm/tlbex.S | 322 ++++--
arch/loongarch/pci/pci.c | 8 +-
arch/loongarch/power/hibernate.c | 6 +-
arch/loongarch/power/suspend.c | 24 +-
arch/loongarch/power/suspend_asm.S | 72 +-
arch/loongarch/vdso/Makefile | 7 +-
arch/loongarch/vdso/vdso.lds.S | 4 +-
arch/loongarch/vdso/vgetcpu.c | 8 +
drivers/firmware/efi/libstub/Makefile | 1 +
drivers/firmware/efi/libstub/loongarch.c | 8 +-
drivers/pci/controller/Kconfig | 2 +-
lib/crc/Kconfig | 2 +-
74 files changed, 2915 insertions(+), 781 deletions(-)
create mode 100644 arch/loongarch/configs/loongson32_defconfig
rename arch/loongarch/configs/{loongson3_defconfig => loongson64_defconfig} (100%)
create mode 100644 arch/loongarch/include/asm/atomic-amo.h
create mode 100644 arch/loongarch/include/asm/atomic-llsc.h
--
2.27.0
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