From edd9ad81947d2136c71657be88d6cc35a56bd22f Mon Sep 17 00:00:00 2001 From: Green Wan Date: Sun, 2 May 2021 23:23:04 -0700 Subject: [PATCH] riscv: cpu: Add callback to init each core Add a callback harts_early_init() to start.S to allow different riscv hart perform setup code for each hart as early as possible. Since all the harts enter the callback, they must be able to run the same setup. Signed-off-by: Green Wan Reviewed-by: Rick Chen Reviewed-by: Bin Meng --- arch/riscv/cpu/cpu.c | 11 +++++++++++ arch/riscv/cpu/start.S | 4 ++++ 2 files changed, 15 insertions(+) diff --git a/arch/riscv/cpu/cpu.c b/arch/riscv/cpu/cpu.c index 85592f5..296e458 100644 --- a/arch/riscv/cpu/cpu.c +++ b/arch/riscv/cpu/cpu.c @@ -140,3 +140,14 @@ int arch_early_init_r(void) { return riscv_cpu_probe(); } + +/** + * harts_early_init() - A callback function called by start.S to configure + * feature settings of each hart. + * + * In a multi-core system, memory access shall be careful here, it shall + * take care of race conditions. + */ +__weak void harts_early_init(void) +{ +} diff --git a/arch/riscv/cpu/start.S b/arch/riscv/cpu/start.S index 8589509..308b0a9 100644 --- a/arch/riscv/cpu/start.S +++ b/arch/riscv/cpu/start.S @@ -117,6 +117,10 @@ call_board_init_f_0: mv sp, a0 #endif + /* Configure proprietary settings and customized CSRs of harts */ +call_harts_early_init: + jal harts_early_init + #ifndef CONFIG_XIP /* * Pick hart to initialize global data and run U-Boot. The other harts -- 2.7.4