At present the hart id passed via a0 in the U-Boot entry is saved to s0 at the beginning but does not preserve later. Save it to the global data structure so that it can be used later.
Signed-off-by: Bin Meng bmeng.cn@gmail.com Reviewed-by: Lukas Auer lukas.auer@aisec.fraunhofer.de Reviewed-by: Anup Patel anup@brainfault.org
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Changes in v5: None Changes in v4: None Changes in v3: - new patch to save boot hart id to the global data
Changes in v2: None
arch/riscv/cpu/start.S | 4 ++++ arch/riscv/include/asm/global_data.h | 1 + arch/riscv/lib/asm-offsets.c | 19 +++++++++++++++++++ 3 files changed, 24 insertions(+) create mode 100644 arch/riscv/lib/asm-offsets.c
diff --git a/arch/riscv/cpu/start.S b/arch/riscv/cpu/start.S index 47c3bf0..81ea52b 100644 --- a/arch/riscv/cpu/start.S +++ b/arch/riscv/cpu/start.S @@ -14,6 +14,7 @@ #include <common.h> #include <elf.h> #include <asm/encoding.h> +#include <generated/asm-offsets.h>
#ifdef CONFIG_32BIT #define LREG lw @@ -70,6 +71,9 @@ call_board_init_f_0:
jal board_init_f_init_reserve
+ /* save the boot hart id to global_data */ + SREG s0, GD_BOOT_HART(gp) + mv a0, zero /* a0 <-- boot_flags = 0 */ la t5, board_init_f jr t5 /* jump to board_init_f() */ diff --git a/arch/riscv/include/asm/global_data.h b/arch/riscv/include/asm/global_data.h index 46fcfab..a3a342c 100644 --- a/arch/riscv/include/asm/global_data.h +++ b/arch/riscv/include/asm/global_data.h @@ -12,6 +12,7 @@
/* Architecture-specific global data */ struct arch_global_data { + long boot_hart; /* boot hart id */ #ifdef CONFIG_SIFIVE_CLINT void __iomem *clint; /* clint base address */ #endif diff --git a/arch/riscv/lib/asm-offsets.c b/arch/riscv/lib/asm-offsets.c new file mode 100644 index 0000000..e0b71f5 --- /dev/null +++ b/arch/riscv/lib/asm-offsets.c @@ -0,0 +1,19 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright (C) 2018, Bin Meng bmeng.cn@gmail.com + * + * From arch/x86/lib/asm-offsets.c + * + * This program is used to generate definitions needed by + * assembly language modules. + */ + +#include <common.h> +#include <linux/kbuild.h> + +int main(void) +{ + DEFINE(GD_BOOT_HART, offsetof(gd_t, arch.boot_hart)); + + return 0; +}