add an idealized NoC

+ Purely virtual, doesn't exist, but would be 'theoretically' ideal.

1 files changed, 52 insertions, 0 deletions

diff --git a/tests/simple_ideal_noc/test.c b/tests/simple_ideal_noc/test.c
new file mode 100644
index 0000000..2e4a22c
--- /dev/null
+++ b/tests/simple_ideal_noc/test.c
@@ -0,0 +1,52 @@
+__attribute__((always_inline))
+static inline char hex_char(unsigned x)
+{
+	if (x <= 9)
+		return x + '0';
+
+	return (x - 10) + 'a';
+}
+
+__attribute__((always_inline))
+static inline void print_int32(volatile char *uart, unsigned x)
+{
+	*uart = hex_char((x >> 28) & 0xf);
+	*uart = hex_char((x >> 24) & 0xf);
+	*uart = hex_char((x >> 20) & 0xf);
+	*uart = hex_char((x >> 16) & 0xf);
+	*uart = hex_char((x >> 12) & 0xf);
+	*uart = hex_char((x >>  8) & 0xf);
+	*uart = hex_char((x >>  4) & 0xf);
+	*uart = hex_char((x >>  0) & 0xf);
+}
+
+__attribute__((always_inline))
+static inline void print_addr(volatile char *uart, unsigned x)
+{
+	*uart = '(';
+	print_int32(uart, x);
+	*uart = ')';
+	*uart = '\n';
+}
+
+void _start(unsigned x, unsigned X)
+{
+	volatile char *uart = (char *)4096;
+	volatile unsigned *control = (unsigned *)(1ULL << 32);
+
+	if (x == 2) {
+		goto do_work;
+	} else {
+		while (*control != x) {}
+	}
+
+do_work:
+	print_addr(uart, x);
+	*control = x + 1;
+
+	if (x == X - 1)
+		asm("ebreak");
+
+	/* otherwise just loop */
+	while (1) {}
+}