start experimenting with processor grids

1 files changed, 43 insertions, 0 deletions

diff --git a/tests/simple_grid/test.c b/tests/simple_grid/test.c
new file mode 100644
index 0000000..782062d
--- /dev/null
+++ b/tests/simple_grid/test.c
@@ -0,0 +1,43 @@
+#define X 64
+#define Y 64
+
+void _start(unsigned char x, unsigned char y)
+{
+	volatile unsigned long *counter = (unsigned long *)4096;
+	volatile char *uart = (char *)8192;
+
+	/* very hacky, not recommended but good enough for testing */
+	if (x == 0 && y == 0)
+		*counter = 0;
+	else
+		while (*counter != ((x << 8) | y))
+			;
+
+	*uart = '(';
+	/* [0 - 63] as two octal numbers */
+	*uart = ((x >> 3) & 0x7) + '0';
+	*uart = ((x >> 0) & 0x7) + '0';
+
+	*uart = ',';
+	*uart = ' ';
+
+	*uart = ((y >> 3) & 0x7) + '0';
+	*uart = ((y >> 0) & 0x7) + '0';
+
+	*uart = ')';
+	*uart = '\n';
+
+	if (y == 63) {
+		x++;
+		y = 0;
+	}
+	else
+		y++;
+
+	*counter = (x << 8) | y;
+
+	while (*counter != (64 << 8))
+		;
+
+	asm ("ebreak\n");
+}