Implement arch_cpu_init() to do some basic architecture level cpu
initialization, like FPU enable, etc.
Signed-off-by: Bin Meng <bmeng...@gmail.com>
---
Changes in v2:
- use csr_set() to set MSTATUS_FS
- only enabling the cycle, time, and instret counters
- change to use satp
arch/riscv/cpu/cpu.c | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)
diff --git a/arch/riscv/cpu/cpu.c b/arch/riscv/cpu/cpu.c
index 3858e51..194799c 100644
--- a/arch/riscv/cpu/cpu.c
+++ b/arch/riscv/cpu/cpu.c
@@ -7,6 +7,7 @@
#include <cpu.h>
#include <log.h>
#include <asm/csr.h>
+#include <asm/encoding.h>
/*
* prior_stage_fdt_address must be stored in the data section since it is used
@@ -67,3 +68,21 @@ int arch_early_init_r(void)
return 0;
}
+
+int arch_cpu_init(void)
+{
+ /* Enable FPU */
+ if (supports_extension('d') || supports_extension('f')) {
+ csr_set(MODE_PREFIX(status), MSTATUS_FS);
+ csr_write(fcsr, 0);
+ }
+
+ /* Enable perf counters for cycle, time, and instret counters only */
+ csr_write(MODE_PREFIX(counteren), GENMASK(2, 0));
+
+ /* Disable paging */
+ if (supports_extension('s'))
+ csr_write(satp, 0);
+
+ return 0;
+}
--
2.7.4
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