riscv: implement local_irq_{save,restore} macros
Add implementations of the local_irq_{save,restore} macros so that
<asm/atomic.h> can be used with riscv.
Signed-off-by: Ben Dooks <ben.dooks@sifive.com>
Reviewed-by: Leo Yu-Chi Liang <ycliang@andestech.com>
diff --git a/arch/riscv/include/asm/system.h b/arch/riscv/include/asm/system.h
index 9d8e43e..ffa7649 100644
--- a/arch/riscv/include/asm/system.h
+++ b/arch/riscv/include/asm/system.h
@@ -7,15 +7,24 @@
#ifndef __ASM_RISCV_SYSTEM_H
#define __ASM_RISCV_SYSTEM_H
+#include <asm/csr.h>
+
struct event;
/*
- * Interrupt configuring macros.
- *
- * TODO
- *
+ * Interupt configuration macros
*/
+#define local_irq_save(__flags) \
+ do { \
+ __flags = csr_read_clear(CSR_SSTATUS, SR_SIE) & SR_SIE; \
+ } while (0)
+
+#define local_irq_restore(__flags) \
+ do { \
+ csr_set(CSR_SSTATUS, __flags & SR_SIE); \
+ } while (0)
+
/* Hook to set up the CPU (called from SPL too) */
int riscv_cpu_setup(void *ctx, struct event *event);