From 485e822346caa982a5c17b7b136b17e8d09dafee Mon Sep 17 00:00:00 2001 From: Bin Meng Date: Wed, 12 Dec 2018 06:12:40 -0800 Subject: [PATCH] riscv: Do some basic architecture level cpu initialization In arch_cpu_init_dm() do some basic architecture level cpu initialization, like FPU enable, etc. Signed-off-by: Bin Meng Reviewed-by: Lukas Auer Reviewed-by: Anup Patel --- arch/riscv/cpu/cpu.c | 27 ++++++++++++++++++++++++++- 1 file changed, 26 insertions(+), 1 deletion(-) diff --git a/arch/riscv/cpu/cpu.c b/arch/riscv/cpu/cpu.c index fc7c9b3751..e662140427 100644 --- a/arch/riscv/cpu/cpu.c +++ b/arch/riscv/cpu/cpu.c @@ -8,6 +8,7 @@ #include #include #include +#include #include /* @@ -61,7 +62,31 @@ static int riscv_cpu_probe(void) int arch_cpu_init_dm(void) { - return riscv_cpu_probe(); + int ret; + + ret = riscv_cpu_probe(); + if (ret) + return ret; + + /* Enable FPU */ + if (supports_extension('d') || supports_extension('f')) { + csr_set(MODE_PREFIX(status), MSTATUS_FS); + csr_write(fcsr, 0); + } + + if (CONFIG_IS_ENABLED(RISCV_MMODE)) { + /* + * Enable perf counters for cycle, time, + * and instret counters only + */ + csr_write(mcounteren, GENMASK(2, 0)); + + /* Disable paging */ + if (supports_extension('s')) + csr_write(satp, 0); + } + + return 0; } int arch_early_init_r(void) -- 2.25.1