a try to add support of FreeRTOS riscV-64 (k210 cpu). first step

1 files changed, 29 insertions, 0 deletions

diff --git a/emu/FreeRTOS/asm-spim.S b/emu/FreeRTOS/asm-spim.S
new file mode 100644
index 0000000..77ae3d4
--- /dev/null
+++ b/emu/FreeRTOS/asm-spim.S
@@ -0,0 +1,29 @@
+#include <sys/asm.h>
+#include <sys/regdef.h>
+#include <asm/cachectl.h>
+
+
+LEAF(FPsave)
+	cfc1	t0, $31
+	sw	t0, 0(a0)		/* a0 is argument */
+	j	$31
+	END(FPsave)
+
+LEAF(FPrestore)
+	lw	t0, 0(a0)		/* a0 is argument */
+	ctc1	t0, $31
+	j	$31
+	END(FPrestore)
+
+LEAF(_tas)
+	.set 	noreorder
+1:
+	ll	v0,0(a0)		/* a0 is argument */
+	or	t1, v0, 1
+	sc	t1,0(a0)
+	beq	t1,zero,1b	
+	nop
+	j	$31			/* lock held */
+	nop
+	.set 	reorder
+	END(_tas)