verilator_lib: wrap verilog module in c++ library in c++ executable

5 files changed, 73 insertions, 0 deletions

diff --git a/verilator_lib/.gitignore b/verilator_lib/.gitignore
new file mode 100644
index 0000000..27f7104
--- /dev/null
+++ b/verilator_lib/.gitignore
@@ -0,0 +1,2 @@
+/obj_dir
+/wrap
diff --git a/verilator_lib/Makefile b/verilator_lib/Makefile
new file mode 100644
index 0000000..3ea76fe
--- /dev/null
+++ b/verilator_lib/Makefile
@@ -0,0 +1,15 @@
+all: wrap
+
+check: all
+	./wrap
+
+clean:
+	rm -fr obj_dir
+
+.PHONY: all check clean
+
+obj_dir/libsim.so: mul.v sim.cc
+	verilator --cc --lib-create sim --build -j 0 -Wall mul.v sim.cc
+
+wrap: obj_dir/libsim.so
+	g++ -Iobj_dir -I/usr/share/verilator/include -I/usr/share/verilator/include/vltstd -o wrap wrap.cc obj_dir/libsim.so
diff --git a/verilator_lib/mul.v b/verilator_lib/mul.v
new file mode 100644
index 0000000..67fb36b
--- /dev/null
+++ b/verilator_lib/mul.v
@@ -0,0 +1,10 @@
+module mul(
+	input			clk,
+	input		[31:0]	x,
+	input		[31:0]	y,
+	output	reg	[31:0]	p
+);
+	always @(posedge clk) begin
+		p <= x * y;
+	end
+endmodule
diff --git a/verilator_lib/sim.cc b/verilator_lib/sim.cc
new file mode 100644
index 0000000..3ca8f67
--- /dev/null
+++ b/verilator_lib/sim.cc
@@ -0,0 +1,36 @@
+#include <cstdint>
+#include <cstdio>
+
+#include "Vmul.h"
+#include "verilated.h"
+
+enum { MAX = 10000 };
+
+int
+sim(void)
+{
+	VerilatedContext *cp = new VerilatedContext;
+
+	Vmul *top = new Vmul{cp};
+	top->clk = 0;
+
+	int numclks = 0;
+	for (int x = 0; x < MAX; ++x) {
+		for (int y = 0; y < MAX; ++y) {
+			top->x = x;
+			top->y = y;
+			top->clk = 1;
+			top->eval();
+
+			int p = top->p;
+			if (p != (uint32_t)(x * y))
+				printf("%4d * %4d = %4d\n", x, y, p);
+
+			top->clk = 0;
+			top->eval();
+			++numclks;
+		}
+	}
+	fprintf(stderr, "%d clock cycles\n", numclks);
+	return 0;
+}
diff --git a/verilator_lib/wrap.cc b/verilator_lib/wrap.cc
new file mode 100644
index 0000000..8d14fbd
--- /dev/null
+++ b/verilator_lib/wrap.cc
@@ -0,0 +1,10 @@
+#include <cstdio>
+
+int sim(void);
+
+int
+main()
+{
+	fprintf(stderr, "nå kaller jeg sim...\n");
+	sim();
+}