platform/wavelet3d: implement JTAG TAP bridge in simulation

7 files changed, 411 insertions, 397 deletions

diff --git a/flake.nix b/flake.nix
index 2432421..dec75ab 100644
--- a/flake.nix
+++ b/flake.nix
@@ -141,6 +141,7 @@
             meson
             ninja
             lcov
+            openocd
             pkg-config
             (python3.withPackages (py: with py; [
               cocotb
diff --git a/platform/wavelet3d/main.cpp b/platform/wavelet3d/main.cpp
index 77cde26..1530f87 100644
--- a/platform/wavelet3d/main.cpp
+++ b/platform/wavelet3d/main.cpp
@@ -15,6 +15,8 @@
 
 #include "Vtop.h"
 
+#include "remote_bitbang.h"
+
 int main(int argc, char **argv)
 {
 	Verilated::commandArgs(argc, argv);
@@ -45,311 +47,32 @@ int main(int argc, char **argv)
 		top.clk = 0;
 	};
 
-	auto send_op = [&](auto a, const char *op, auto b)
-	{
-		std::printf
-		(
-			"[%03d] <= %s %s %s\n",
-			time, std::to_string(a).c_str(), op, std::to_string(b).c_str()
-		);
-
-		top.a[0] = *reinterpret_cast<unsigned*>(&a);
-		top.b[0] = *reinterpret_cast<unsigned*>(&b);
-		top.in_valid = 1;
-		cycle();
-
-		top.a[0] = 0;
-		top.b[0] = 0;
-		top.in_valid = 0;
-	};
-
-	auto int_to_fp = [&](int a)
-	{
-		top.setup_mul_float = 0;
-		top.setup_unit_b = 1;
-		top.mnorm_put_hi = 0;
-		top.mnorm_put_lo = 1;
-		top.mnorm_put_mul = 0;
-		top.mnorm_zero_flags = 1;
-		top.mnorm_zero_b = 1;
-		top.minmax_abs = 1;
-		top.minmax_swap = 0;
-		top.minmax_zero_min = 0;
-		top.minmax_copy_flags = 0;
-		top.shiftr_int_signed = 1;
-		top.addsub_int_operand = 1;
-		top.addsub_copy_flags = 1;
-		top.clz_force_nop = 0;
-		top.shiftl_copy_flags = 0;
-		top.round_copy_flags = 0;
-		top.round_enable = 1;
-		top.encode_enable = 1;
-
-		send_op(a, "fp->int", 0);
-	};
-
-	auto mul_int = [&](unsigned a, unsigned b)
-	{
-		top.setup_mul_float = 0;
-		top.setup_unit_b = 0;
-		top.mnorm_put_hi = 0;
-		top.mnorm_put_lo = 1;
-		top.mnorm_put_mul = 0;
-		top.mnorm_zero_flags = 1;
-		top.mnorm_zero_b = 1;
-		top.minmax_abs = 1;
-		top.minmax_swap = 0;
-		top.minmax_zero_min = 0;
-		top.minmax_copy_flags = 1;
-		top.shiftr_int_signed = 0;
-		top.addsub_int_operand = 0;
-		top.addsub_copy_flags = 1;
-		top.clz_force_nop = 1;
-		top.shiftl_copy_flags = 1;
-		top.round_copy_flags = 1;
-		top.round_enable = 0;
-		top.encode_enable = 0;
-
-		send_op(a, "*", b);
-	};
-
-	// mul fp
-	auto mul_fp = [&](float a, float b)
-	{
-		top.setup_mul_float = 1;
-		top.setup_unit_b = 0;
-		top.mnorm_put_hi = 0;
-		top.mnorm_put_lo = 0;
-		top.mnorm_put_mul = 1;
-		top.mnorm_zero_flags = 0;
-		top.mnorm_zero_b = 1;
-		top.minmax_abs = 1;
-		top.minmax_swap = 0;
-		top.minmax_zero_min = 0;
-		top.minmax_copy_flags = 1;
-		top.shiftr_int_signed = 0;
-		top.addsub_int_operand = 0;
-		top.addsub_copy_flags = 1;
-		top.clz_force_nop = 1;
-		top.shiftl_copy_flags = 1;
-		top.round_copy_flags = 1;
-		top.round_enable = 1;
-		top.encode_enable = 1;
-
-		send_op(a, "*", b);
-	};
-
-	auto add_fp = [&](float a, float b)
-	{
-		top.setup_mul_float = 0;
-		top.setup_unit_b = 1;
-		top.mnorm_put_hi = 0;
-		top.mnorm_put_lo = 1;
-		top.mnorm_put_mul = 0;
-		top.mnorm_zero_flags = 0;
-		top.mnorm_zero_b = 0;
-		top.minmax_abs = 1;
-		top.minmax_swap = 0;
-		top.minmax_zero_min = 0;
-		top.minmax_copy_flags = 0;
-		top.shiftr_int_signed = 0;
-		top.addsub_int_operand = 0;
-		top.addsub_copy_flags = 0;
-		top.clz_force_nop = 0;
-		top.shiftl_copy_flags = 0;
-		top.round_copy_flags = 0;
-		top.round_enable = 1;
-		top.encode_enable = 1;
-
-		send_op(a, "+", b);
-	};
-
-	auto min_max_fp = [&](float a, float b, bool min = false)
-	{
-		top.setup_mul_float = 0;
-		top.setup_unit_b = 1;
-		top.mnorm_put_hi = 0;
-		top.mnorm_put_lo = 1;
-		top.mnorm_put_mul = 0;
-		top.mnorm_zero_flags = 0;
-		top.mnorm_zero_b = 0;
-		top.minmax_abs = 0;
-		top.minmax_swap = min;
-		top.minmax_zero_min = 1;
-		top.minmax_copy_flags = 1;
-		top.shiftr_int_signed = 0;
-		top.addsub_int_operand = 0;
-		top.addsub_copy_flags = 1;
-		top.clz_force_nop = 1;
-		top.shiftl_copy_flags = 1;
-		top.round_copy_flags = 1;
-		top.round_enable = 0;
-		top.encode_enable = 0;
-
-		send_op(a, min ? "min" : "max", b);
-	};
-
 	top.clk = 0;
 	top.rst_n = 0;
-	top.in_valid = 0;
-	top.geom_tvalid = 0;
-	top.raster_tready = 0;
+	top.jtag_tck = 0;
+	top.jtag_tms = 0;
+	top.jtag_tdi = 0;
 	cycle();
 
 	top.rst_n = 1;
 	cycle();
 
-	int a, b;
-	float a_flt, b_flt;
-
-	std::cout << "a_int: ";
-	std::cin >> a;
-	std::cout << "b_int: ";
-	std::cin >> b;
-	std::cout << "a_flt: ";
-	std::cin >> a_flt;
-	std::cout << "b_flt: ";
-	std::cin >> b_flt;
-
-	int_to_fp(a);
-	mul_int(a, b);
-	mul_fp(a_flt, b_flt);
-	add_fp(a_flt, b_flt);
-	min_max_fp(a_flt, b_flt);
-	min_max_fp(a_flt, b_flt, true);
-
-	float a_x, a_y, b_x, b_y, c_x, c_y;
-	std::cout << "a_x: ";
-	std::cin >> a_x;
-	std::cout << "a_y: ";
-	std::cin >> a_y;
-	std::cout << "b_x: ";
-	std::cin >> b_x;
-	std::cout << "b_y: ";
-	std::cin >> b_y;
-	std::cout << "c_x: ";
-	std::cin >> c_x;
-	std::cout << "c_y: ";
-	std::cin >> c_y;
-
-	unsigned cycles;
-	std::cout << "cycles: ";
-	std::cin >> cycles;
-
-	constexpr int FIXED_FRAC = 10;
-
-	int geom[] = {
-		42,
-		static_cast<int>(::ldexpf(a_x, FIXED_FRAC)),
-		static_cast<int>(::ldexpf(b_x, FIXED_FRAC)),
-		static_cast<int>(::ldexpf(c_x, FIXED_FRAC)),
-		static_cast<int>(::ldexpf(a_y, FIXED_FRAC)),
-		static_cast<int>(::ldexpf(b_y, FIXED_FRAC)),
-		static_cast<int>(::ldexpf(c_y, FIXED_FRAC)),
-	};
-
-    ::SDL_Event event;
-    ::SDL_Renderer *renderer;
-	::SDL_Window *window;
-
-	//FIXME: errores
-	::SDL_Init(SDL_INIT_VIDEO);
-	::SDL_CreateWindowAndRenderer(640, 480, 0, &window, &renderer);
-    ::SDL_SetRenderDrawColor(renderer, 0, 0, 0, 0);
-	::SDL_RenderClear(renderer);
-
-    ::SDL_SetRenderDrawColor(renderer, 255, 255, 255, 0);
+	rbs_init(1234);
 
-	int bary_idx = 0, x_coarse, y_coarse, x_fine, y_fine;
-	int geom_state = 0;
-	int bit;
-	float barys[3];
-	unsigned mask;
-	unsigned geom_idx = 0;
-
-	top.raster_tready = 1;
-	while (time < 2 * cycles) {
+	do {
 		cycle();
 
-		if (top.out_valid) {
-			unsigned q_bits = top.q[0];
-			int q_int = *reinterpret_cast<int*>(&q_bits);
-			float q_flt = *reinterpret_cast<float*>(&q_bits);
-
-			std::printf
-			(
-				"[%03d] => q=0x%08x, q_flt=%g, q_int=%d, q_uint=%u\n",
-				time, q_bits, q_flt, q_int, q_bits
-			);
-		}
-
-		if (geom_idx < sizeof geom / sizeof geom[0]) {
-			top.geom_tdata = geom[geom_idx];
-			top.geom_tlast = geom_idx == sizeof geom / sizeof geom[0] - 1;
-			top.geom_tvalid = 1;
-
-			top.eval();
-			if (top.geom_tready)
-				geom_idx++;
-		} else {
-			top.geom_tlast = 0;
-			top.geom_tvalid = 0;
-		}
-
-		if (top.raster_tvalid) {
-			unsigned data = top.raster_tdata;
-			auto fixed = ::ldexpf(static_cast<float>(static_cast<int>(data)), -FIXED_FRAC);
-
-			//std::printf("[%03d] raster[%c] d=0x%08x, d_fix=%g\n",
-			//	time, top.raster_tlast ? 'l' : '-', data, fixed);
+		unsigned char tck = top.jtag_tck;
+		unsigned char tms = top.jtag_tms;
+		unsigned char tdi = top.jtag_tdi;
+		unsigned char trstn = 1;
 
-			switch (geom_state) {
-				case 0:
-					geom_state = 1;
-					break;
+		rbs_tick(&tck, &tms, &tdi, &trstn, top.jtag_tdo);
 
-				case 1:
-					y_coarse = (static_cast<int>(data) >> 16 << 2) + 480/2;
-					x_coarse = (static_cast<short>(data & 0xffff) << 2) + 640/2;
-					geom_state = 2;
-    				::SDL_SetRenderDrawColor(renderer, 255, 0, 0, 0);
-					for (int dy = 0; dy < 4; ++dy)
-						for (int dx = 0; dx < 4; ++dx)
-							::SDL_RenderDrawPoint(renderer, x_coarse + dx, y_coarse + dy);
-					break;
-
-				case 2:
-					mask = data;
-					geom_state = 3;
-					break;
-
-				case 3:
-					bit = ::ffs(mask) - 1;
-					barys[bary_idx] = fixed;
-					switch (bary_idx) {
-						case 0:
-							bary_idx = 1;
-							break;
-						case 1:
-							bary_idx = 2;
-							break;
-						case 2:
-							bary_idx = 0;
-							mask = mask & ~(1 << bit);
-							y_fine = y_coarse + (bit >> 2);
-							x_fine = x_coarse + (bit & 0b11);
-
-    						::SDL_SetRenderDrawColor(renderer, 255, 255, 255, 0);
-							::SDL_RenderDrawPoint(renderer, x_fine, y_fine);
-
-							break;
-					}
-					if (top.raster_tlast)
-						geom_state = 0;
-					break;
-			}
-		}
-	}
+		top.jtag_tck = tck;
+		top.jtag_tms = tms;
+		top.jtag_tdi = tdi;
+	} while (!(client_fd < 0));
 
 #if VM_TRACE
 	trace.close();
@@ -357,13 +80,5 @@ int main(int argc, char **argv)
 
 	top.final();
 
-	::SDL_RenderPresent(renderer);
-    while (!::SDL_PollEvent(&event) || event.type != SDL_QUIT)
-		continue;
-
-	::SDL_DestroyRenderer(renderer);
-	::SDL_DestroyWindow(window);
-	::SDL_Quit();
-
 	return EXIT_SUCCESS;
 }
diff --git a/platform/wavelet3d/mod.mk b/platform/wavelet3d/mod.mk
index c30766e..05e435e 100644
--- a/platform/wavelet3d/mod.mk
+++ b/platform/wavelet3d/mod.mk
@@ -5,6 +5,6 @@ define core
   $(this)/rtl_dirs := .
   $(this)/rtl_files := w3d_top.sv
 
-  $(this)/vl_main := main.cpp
+  $(this)/vl_main := main.cpp remote_bitbang.cpp
   $(this)/vl_pkgconfig := sdl2
 endef
diff --git a/platform/wavelet3d/openocd.cfg b/platform/wavelet3d/openocd.cfg
new file mode 100644
index 0000000..f801f6a
--- /dev/null
+++ b/platform/wavelet3d/openocd.cfg
@@ -0,0 +1,32 @@
+debug_level 0
+adapter speed 10000
+
+adapter driver remote_bitbang
+remote_bitbang host localhost
+
+remote_bitbang port 1234
+
+# we don't have srst
+reset_config trst_only
+
+set _CHIPNAME riscv
+set _TARGETNAME $_CHIPNAME.cpu
+
+jtag newtap $_CHIPNAME cpu -irlen 5 -expected-id 0x10002FFF
+target create $_TARGETNAME.0 riscv -chain-position $_TARGETNAME
+
+foreach t [jtag names] {
+    puts [format "TAP: %s\n" $t]
+}
+
+target create $_TARGETNAME riscv -chain-position $_TARGETNAME 
+
+riscv set_reset_timeout_sec 2000
+riscv set_command_timeout_sec 2000
+riscv set_prefer_sba on
+
+scan_chain
+init
+reset halt
+
+echo "Ready for Remote Connections on port 3333."
diff --git a/platform/wavelet3d/remote_bitbang.cpp b/platform/wavelet3d/remote_bitbang.cpp
new file mode 100644
index 0000000..5e87233
--- /dev/null
+++ b/platform/wavelet3d/remote_bitbang.cpp
@@ -0,0 +1,300 @@
+// https://github.com/pulp-platform/riscv-dbg/blob/master/tb/remote_bitbang/remote_bitbang.c
+// See LICENSE.Berkeley for license details.
+
+#include <arpa/inet.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "remote_bitbang.h"
+
+//Public globals, declared in remote_bitbang.h
+
+int rbs_err;
+
+unsigned char tck;
+unsigned char tms;
+unsigned char tdi;
+unsigned char trstn;
+unsigned char tdo;
+unsigned char quit;
+
+int socket_fd;
+int client_fd;
+
+//static const ssize_t buf_size = 64 * 1024;
+char recv_buf[64 * 1024];
+ssize_t recv_start, recv_end;
+
+int rbs_init(uint16_t port)
+{
+    socket_fd  = 0;
+    client_fd  = 0;
+    recv_start = 0;
+    recv_end   = 0;
+    rbs_err    = 0;
+
+    socket_fd = socket(AF_INET, SOCK_STREAM, 0);
+    if (socket_fd == -1) {
+        fprintf(stderr, "remote_bitbang failed to make socket: %s (%d)\n",
+                strerror(errno), errno);
+        abort();
+    }
+
+    fcntl(socket_fd, F_SETFL, O_NONBLOCK);
+    int reuseaddr = 1;
+    if (setsockopt(socket_fd, SOL_SOCKET, SO_REUSEADDR, &reuseaddr,
+                   sizeof(int)) == -1) {
+        fprintf(stderr, "remote_bitbang failed setsockopt: %s (%d)\n",
+                strerror(errno), errno);
+        abort();
+    }
+
+    struct sockaddr_in addr;
+    memset(&addr, 0, sizeof(addr));
+    addr.sin_family      = AF_INET;
+    addr.sin_addr.s_addr = INADDR_ANY;
+    addr.sin_port        = htons(port);
+
+    if (bind(socket_fd, (struct sockaddr *)&addr, sizeof(addr)) == -1) {
+        fprintf(stderr, "remote_bitbang failed to bind socket: %s (%d)\n",
+                strerror(errno), errno);
+        abort();
+    }
+
+    if (listen(socket_fd, 1) == -1) {
+        fprintf(stderr, "remote_bitbang failed to listen on socket: %s (%d)\n",
+                strerror(errno), errno);
+        abort();
+    }
+
+    socklen_t addrlen = sizeof(addr);
+    if (getsockname(socket_fd, (struct sockaddr *)&addr, &addrlen) == -1) {
+        fprintf(stderr, "remote_bitbang getsockname failed: %s (%d)\n",
+                strerror(errno), errno);
+        abort();
+    }
+
+    tck   = 1;
+    tms   = 1;
+    tdi   = 1;
+    trstn = 1;
+    quit  = 0;
+
+    fprintf(stderr, "JTAG remote bitbang server is ready\n");
+    fprintf(stderr, "Listening on port %d\n", ntohs(addr.sin_port));
+    return 1;
+}
+
+void rbs_accept()
+{
+    fprintf(stderr, "Attempting to accept client socket\n");
+    int again = 1;
+    while (again != 0) {
+        client_fd = accept(socket_fd, NULL, NULL);
+        if (client_fd == -1) {
+            if (errno == EAGAIN) {
+                // No client waiting to connect right now.
+            } else {
+                fprintf(stderr, "failed to accept on socket: %s (%d)\n",
+                        strerror(errno), errno);
+                again = 0;
+                abort();
+            }
+        } else {
+            fcntl(client_fd, F_SETFL, O_NONBLOCK);
+            fprintf(stderr, "Accepted successfully.\n");
+            again = 0;
+        }
+    }
+}
+
+void rbs_tick(unsigned char *jtag_tck, unsigned char *jtag_tms,
+              unsigned char *jtag_tdi, unsigned char *jtag_trstn,
+              unsigned char jtag_tdo)
+{
+    if (client_fd > 0) {
+        tdo = jtag_tdo;
+        rbs_execute_command();
+    } else {
+        rbs_accept();
+    }
+
+    *jtag_tck   = tck;
+    *jtag_tms   = tms;
+    *jtag_tdi   = tdi;
+    *jtag_trstn = trstn;
+}
+
+void rbs_reset()
+{
+    trstn = 0;
+}
+
+void rbs_set()
+{
+    trstn = 1;
+}
+
+void rbs_set_pins(char _tck, char _tms, char _tdi)
+{
+    tck = _tck;
+    tms = _tms;
+    tdi = _tdi;
+}
+
+void rbs_execute_command()
+{
+    char command;
+    int again = 1;
+    while (again) {
+        ssize_t num_read = read(client_fd, &command, sizeof(command));
+        if (num_read == -1) {
+            if (errno == EAGAIN) {
+                // We'll try again the next call.
+                if (VERBOSE)
+                    fprintf(
+                        stderr,
+                        "Received no command. Will try again on the next call\n");
+            } else {
+                fprintf(stderr,
+                        "remote_bitbang failed to read on socket: %s (%d)\n",
+                        strerror(errno), errno);
+                again = 0;
+                abort();
+            }
+        } else if (num_read == 0) {
+            fprintf(stderr, "No command received. Stopping further reads.\n");
+            close(client_fd);
+            client_fd = -1;
+            // again = 1;
+            return;
+        } else {
+            again = 0;
+        }
+    }
+
+    int dosend = 0;
+
+    char tosend = '?';
+
+    switch (command) {
+    case 'B':
+        if (VERBOSE)
+            fprintf(stderr, "*BLINK*\n");
+        break;
+    case 'b':
+        if (VERBOSE)
+            fprintf(stderr, "blink off\n");
+        break;
+    case 'r':
+        if (VERBOSE)
+            fprintf(stderr, "r-reset\n");
+        rbs_set(); //r-reset command deasserts TRST. See: openocd/blob/master/doc/manual/jtag/drivers/remote_bitbang.txt
+        break; 
+    case 's':
+        if (VERBOSE)
+            fprintf(stderr, "s-reset\n");
+        rbs_set(); //s-reset command deasserts TRST. See: openocd/blob/master/doc/manual/jtag/drivers/remote_bitbang.txt
+        break;
+    case 't':
+        if (VERBOSE)
+            fprintf(stderr, "t-reset\n");
+        rbs_reset(); //t-reset command asserts TRST. See: openocd/blob/master/doc/manual/jtag/drivers/remote_bitbang.txt
+        break;
+    case 'u':
+        if (VERBOSE)
+            fprintf(stderr, "u-reset\n");
+        rbs_reset(); //u-reset command asserts TRST. See: openocd/blob/master/doc/manual/jtag/drivers/remote_bitbang.txt
+        break;
+    case '0':
+        if (VERBOSE)
+            fprintf(stderr, "Write 0 0 0\n");
+        rbs_set_pins(0, 0, 0);
+        break;
+    case '1':
+        if (VERBOSE)
+            fprintf(stderr, "Write 0 0 1\n");
+        rbs_set_pins(0, 0, 1);
+        break;
+    case '2':
+        if (VERBOSE)
+            fprintf(stderr, "Write 0 1 0\n");
+        rbs_set_pins(0, 1, 0);
+        break;
+    case '3':
+        if (VERBOSE)
+            fprintf(stderr, "Write 0 1 1\n");
+        rbs_set_pins(0, 1, 1);
+        break;
+    case '4':
+        if (VERBOSE)
+            fprintf(stderr, "Write 1 0 0\n");
+        rbs_set_pins(1, 0, 0);
+        break;
+    case '5':
+        if (VERBOSE)
+            fprintf(stderr, "Write 1 0 1\n");
+        rbs_set_pins(1, 0, 1);
+        break;
+    case '6':
+        if (VERBOSE)
+            fprintf(stderr, "Write 1 1 0\n");
+        rbs_set_pins(1, 1, 0);
+        break;
+    case '7':
+        if (VERBOSE)
+            fprintf(stderr, "Write 1 1 1\n");
+        rbs_set_pins(1, 1, 1);
+        break;
+    case 'R':
+        if (VERBOSE)
+            fprintf(stderr, "Read req\n");
+        dosend = 1;
+        tosend = tdo ? '1' : '0';
+        break;
+    case 'Q':
+        if (VERBOSE)
+            fprintf(stderr, "Quit req\n");
+        quit = 1;
+        break;
+    default:
+        fprintf(stderr, "remote_bitbang got unsupported command '%c'\n",
+                command);
+    }
+    if (dosend) {
+        while (1) {
+            ssize_t bytes = write(client_fd, &tosend, sizeof(tosend));
+            if (bytes == -1) {
+                fprintf(stderr, "failed to write to socket: %s (%d)\n",
+                        strerror(errno), errno);
+                abort();
+            }
+            if (bytes > 0) {
+                break;
+            }
+        }
+    }
+
+    if (quit) {
+        fprintf(stderr, "Remote end disconnected\n");
+        close(client_fd);
+        client_fd = 0;
+    }
+}
+
+unsigned char rbs_done()
+{
+    return quit;
+}
+
+int rbs_exit_code()
+{
+    return rbs_err;
+}
diff --git a/platform/wavelet3d/remote_bitbang.h b/platform/wavelet3d/remote_bitbang.h
new file mode 100644
index 0000000..0e294e8
--- /dev/null
+++ b/platform/wavelet3d/remote_bitbang.h
@@ -0,0 +1,53 @@
+// https://github.com/pulp-platform/riscv-dbg/blob/master/tb/remote_bitbang/remote_bitbang.h
+// See LICENSE.Berkeley for license details.
+
+#ifndef REMOTE_BITBANG_H
+#define REMOTE_BITBANG_H
+
+#include <stdint.h>
+#include <sys/types.h>
+
+#define VERBOSE 0
+
+extern int rbs_err;
+
+extern unsigned char tck;
+extern unsigned char tms;
+extern unsigned char tdi;
+extern unsigned char trstn;
+extern unsigned char tdo;
+extern unsigned char quit;
+
+extern int socket_fd;
+extern int client_fd;
+
+//static const ssize_t buf_size = 64 * 1024;
+extern char recv_buf[64 * 1024];
+extern ssize_t recv_start, recv_end;
+
+// Create a new server, listening for connections from localhost on the given
+// port.
+int rbs_init(uint16_t port);
+
+// Do a bit of work.
+void rbs_tick(unsigned char *jtag_tck, unsigned char *jtag_tms,
+              unsigned char *jtag_tdi, unsigned char *jtag_trstn,
+              unsigned char jtag_tdo);
+
+unsigned char rbs_done();
+
+int rbs_exit_code();
+
+// Check for a client connecting, and accept if there is one.
+void rbs_accept();
+// Execute any commands the client has for us.
+// But we only execute 1 because we need time for the
+// simulation to run.
+void rbs_execute_command();
+
+void rbs_reset(); //Assert TRST
+void rbs_set(); //Deassert TRST
+
+void rbs_set_pins(char _tck, char _tms, char _tdi);
+
+#endif
diff --git a/platform/wavelet3d/w3d_top.sv b/platform/wavelet3d/w3d_top.sv
index 0875ba2..2b24ec4 100644
--- a/platform/wavelet3d/w3d_top.sv
+++ b/platform/wavelet3d/w3d_top.sv
@@ -1,92 +1,25 @@
 module w3d_top
-import gfx::*;
 (
 	input  logic clk,
 	             rst_n,
 
-	input  word  a[SHADER_LANES],
-	             b[SHADER_LANES],
-	input  logic in_valid,
-	             setup_mul_float,
-	             setup_unit_b,
-	             mnorm_put_hi,
-	             mnorm_put_lo,
-	             mnorm_put_mul,
-	             mnorm_zero_b,
-	             mnorm_zero_flags,
-	             minmax_abs,
-	             minmax_swap,
-	             minmax_zero_min,
-	             minmax_copy_flags,
-	             shiftr_int_signed,
-	             addsub_copy_flags,
-	             addsub_int_operand,
-	             clz_force_nop,
-	             shiftl_copy_flags,
-	             round_copy_flags,
-	             round_enable,
-	             encode_enable,
+	input  logic jtag_tck,
+	             jtag_tms,
+	             jtag_tdi,
 
-	output logic out_valid,
-	output word  q[SHADER_LANES],
-
-	input  word  geom_tdata,
-	input  logic geom_tlast,
-	             geom_tvalid,
-	output logic geom_tready,
-
-	input  logic raster_tready,
-	output logic raster_tlast,
-	             raster_tvalid,
-	output word  raster_tdata
+	output logic jtag_tdo
 );
 
-	gfx_wb fpint_wb();
 	if_tap host_jtag();
 	if_axib dram(), host_dbus(), host_ibus();
 	if_axil external_io(), gfx_ctrl();
-	if_pkts coverage(), geometry();
-	gfx_regfile_io fpint_io();
 
 	logic srst_n;
 
-	assign q = fpint_wb.rx.lanes;
-	assign out_valid = fpint_wb.rx.valid;
-
-	assign geometry.tx.tdata = geom_tdata;
-	assign geometry.tx.tlast = geom_tlast;
-	assign geometry.tx.tvalid = geom_tvalid;
-	assign geom_tready = geometry.tx.tready;
-
-	assign raster_tdata = coverage.rx.tdata;
-	assign raster_tlast = coverage.rx.tlast;
-	assign raster_tvalid = coverage.rx.tvalid;
-	assign coverage.rx.tready = raster_tready;
-
-	fpint_op op;
-	assign op.writeback = 1;
-	assign op.setup_mul_float = setup_mul_float;
-	assign op.setup_unit_b = setup_unit_b;
-	assign op.mnorm_put_hi = mnorm_put_hi;
-	assign op.mnorm_put_lo = mnorm_put_lo;
-	assign op.mnorm_put_mul = mnorm_put_mul;
-	assign op.mnorm_zero_b = mnorm_zero_b;
-	assign op.mnorm_zero_flags = mnorm_zero_flags;
-	assign op.minmax_abs = minmax_abs;
-	assign op.minmax_swap = minmax_swap;
-	assign op.minmax_zero_min = minmax_zero_min;
-	assign op.minmax_copy_flags = minmax_copy_flags;
-	assign op.shiftr_int_signed = shiftr_int_signed;
-	assign op.addsub_copy_flags = addsub_copy_flags;
-	assign op.addsub_int_operand = addsub_int_operand;
-	assign op.clz_force_nop = clz_force_nop;
-	assign op.shiftl_copy_flags = shiftl_copy_flags;
-	assign op.round_copy_flags = round_copy_flags;
-	assign op.round_enable = round_enable;
-	assign op.encode_enable = encode_enable;
-
-	assign fpint_io.regs.a = a;
-	assign fpint_io.regs.b = b;
+	assign jtag_tdo = host_jtag.m.tdo;
+	assign host_jtag.m.tck = jtag_tck;
+	assign host_jtag.m.tms = jtag_tms;
+	assign host_jtag.m.tdi = jtag_tdi;
 
 	if_rst_sync rst_sync
 	(
@@ -95,26 +28,6 @@ import gfx::*;
 		.srst_n
 	);
 
-	gfx_shader_fpint fpint
-	(
-		.clk,
-		.rst_n,
-		.op,
-		.wb(fpint_wb.tx),
-		.wave(),
-		.abort(0),
-		.in_valid,
-		.read_data(fpint_io.ab)
-	);
-
-	gfx_raster raster
-	(
-		.clk,
-		.rst_n,
-		.geometry(geometry.rx),
-		.coverage(coverage.tx)
-	);
-
 	gfx_top gfx
 	(
 		.clk,