overhaul meshes

+ Previous name was grid

1 files changed, 55 insertions, 0 deletions

diff --git a/tests/simple_mesh/test.c b/tests/simple_mesh/test.c
new file mode 100644
index 0000000..b1bbe84
--- /dev/null
+++ b/tests/simple_mesh/test.c
@@ -0,0 +1,55 @@
+__attribute__((always_inline))
+static inline void print_int8(volatile char *uart, unsigned x)
+{
+	*uart = ((x >> 4) & 0xf) + '0';
+	*uart = ((x >> 0) & 0xf) + '0';
+}
+
+__attribute__((always_inline))
+static inline void print_addr(volatile char *uart, unsigned x, unsigned y)
+{
+	*uart = '(';
+	print_int8(uart, x);
+	*uart = ',';
+	*uart = ' ';
+	print_int8(uart, y);
+	*uart = ')';
+	*uart = '\n';
+}
+
+__attribute__((always_inline))
+static inline unsigned wrap(unsigned x, unsigned X)
+{
+	return x + 1 >= X ? 0 : x + 1;
+}
+
+__attribute__((always_inline))
+static inline unsigned next_idx(unsigned x, unsigned y, unsigned X, unsigned Y)
+{
+	unsigned yi = wrap(y, Y);
+	unsigned xi = yi < y ? wrap(x, X) : x;
+
+	return (xi << 16) | yi;
+}
+
+void _start(unsigned x, unsigned y, unsigned X, unsigned Y)
+{
+	volatile char *uart = (char *)4096;
+	volatile unsigned *control = (unsigned *)(1ULL << 48);
+
+	if (x == 0 && y == 2) {
+		goto do_work;
+	} else {
+		while (*control != ((x << 16) | y)) {}
+	}
+
+do_work:
+	print_addr(uart, x, y);
+	*control = next_idx(x, y, X, Y);
+
+	if (x == X - 1 && y == Y - 1)
+		asm("ebreak");
+
+	/* otherwise just loop */
+	while (1) {}
+}