From 6b0f8bd8709d28f1a1a1e0779bbe76edfb30e67a Mon Sep 17 00:00:00 2001
From: Tim Fischer <fischeti@iis.ee.ethz.ch>
Date: Fri, 10 Nov 2023 09:56:58 +0100
Subject: [PATCH] runtime: Add rtl runtime that does not depend on fesvr

---
 target/snitch_cluster/sw/Makefile             |  6 ++-
 target/snitch_cluster/sw/apps/common.mk       |  2 +
 .../sw/runtime/rtl-no-fesvr/Makefile          | 10 +++++
 .../sw/runtime/rtl-no-fesvr/memory.ld         |  8 ++++
 .../sw/runtime/rtl-no-fesvr/src/putchar.c     |  8 ++++
 .../rtl-no-fesvr/src/snitch_cluster_start.S   | 15 ++++++++
 .../rtl-no-fesvr/src/snitch_cluster_start.c   | 18 +++++++++
 .../sw/runtime/rtl-no-fesvr/src/snrt.c        | 19 ++++++++++
 .../sw/runtime/rtl-no-fesvr/src/snrt.h        | 38 +++++++++++++++++++
 target/snitch_cluster/sw/tests/Makefile       |  2 +
 10 files changed, 124 insertions(+), 2 deletions(-)
 create mode 100644 target/snitch_cluster/sw/runtime/rtl-no-fesvr/Makefile
 create mode 100644 target/snitch_cluster/sw/runtime/rtl-no-fesvr/memory.ld
 create mode 100644 target/snitch_cluster/sw/runtime/rtl-no-fesvr/src/putchar.c
 create mode 100644 target/snitch_cluster/sw/runtime/rtl-no-fesvr/src/snitch_cluster_start.S
 create mode 100644 target/snitch_cluster/sw/runtime/rtl-no-fesvr/src/snitch_cluster_start.c
 create mode 100644 target/snitch_cluster/sw/runtime/rtl-no-fesvr/src/snrt.c
 create mode 100644 target/snitch_cluster/sw/runtime/rtl-no-fesvr/src/snrt.h

diff --git a/target/snitch_cluster/sw/Makefile b/target/snitch_cluster/sw/Makefile
index a0115d00a..5553423f4 100644
--- a/target/snitch_cluster/sw/Makefile
+++ b/target/snitch_cluster/sw/Makefile
@@ -9,11 +9,13 @@ SELECT_RUNTIME ?= rtl
 
 ifeq ($(SELECT_RUNTIME), banshee)
 RUNTIME = runtime/banshee
+else ifeq ($(SELECT_RUNTIME), rtl-no-fesvr)
+RUNTIME = runtime/rtl-no-fesvr
 else
 RUNTIME = runtime/rtl
 endif
 
-SUBDIRS = runtime/banshee runtime/rtl math apps tests
+SUBDIRS = runtime/banshee runtime/rtl math runtime/rtl-no-fesvr apps tests
 
 .PHONY: all $(SUBDIRS)
 
@@ -27,5 +29,5 @@ apps: $(RUNTIME) math
 tests: $(RUNTIME) math
 	$(MAKE) -C $@ $(TARGET)
 
-runtime/rtl runtime/banshee math:
+runtime/rtl runtime/rtl-no-fesvr runtime/banshee math:
 	$(MAKE) -C $@ $(TARGET)
diff --git a/target/snitch_cluster/sw/apps/common.mk b/target/snitch_cluster/sw/apps/common.mk
index f0e43cd7a..3f23ad93f 100644
--- a/target/snitch_cluster/sw/apps/common.mk
+++ b/target/snitch_cluster/sw/apps/common.mk
@@ -19,6 +19,8 @@ SNRT_DIR := $(ROOT)/sw/snRuntime
 ifeq ($(SELECT_RUNTIME), banshee)
 RUNTIME_DIR  := $(ROOT)/target/snitch_cluster/sw/runtime/banshee
 RISCV_CFLAGS += -DBIST
+else ifeq ($(SELECT_RUNTIME), rtl-no-fesvr)
+RUNTIME_DIR := $(ROOT)/target/snitch_cluster/sw/runtime/rtl-no-fesvr
 else
 RUNTIME_DIR := $(ROOT)/target/snitch_cluster/sw/runtime/rtl
 endif
diff --git a/target/snitch_cluster/sw/runtime/rtl-no-fesvr/Makefile b/target/snitch_cluster/sw/runtime/rtl-no-fesvr/Makefile
new file mode 100644
index 000000000..ae9ff7f77
--- /dev/null
+++ b/target/snitch_cluster/sw/runtime/rtl-no-fesvr/Makefile
@@ -0,0 +1,10 @@
+# Copyright 2023 ETH Zurich and University of Bologna.
+# Licensed under the Apache License, Version 2.0, see LICENSE for details.
+# SPDX-License-Identifier: Apache-2.0
+#
+# Luca Colagrande <colluca@iis.ee.ethz.ch>
+
+SRCS  = snitch_cluster_start.S
+SRCS += snrt.c
+
+include ../common/common.mk
diff --git a/target/snitch_cluster/sw/runtime/rtl-no-fesvr/memory.ld b/target/snitch_cluster/sw/runtime/rtl-no-fesvr/memory.ld
new file mode 100644
index 000000000..985c7cfd8
--- /dev/null
+++ b/target/snitch_cluster/sw/runtime/rtl-no-fesvr/memory.ld
@@ -0,0 +1,8 @@
+/* Copyright 2020 ETH Zurich and University of Bologna. */
+/* Solderpad Hardware License, Version 0.51, see LICENSE for details. */
+/* SPDX-License-Identifier: SHL-0.51 */
+
+MEMORY
+{
+    L3 (rwxa) : ORIGIN = 0x80000000, LENGTH = 0x80000000
+}
diff --git a/target/snitch_cluster/sw/runtime/rtl-no-fesvr/src/putchar.c b/target/snitch_cluster/sw/runtime/rtl-no-fesvr/src/putchar.c
new file mode 100644
index 000000000..d8cb5986d
--- /dev/null
+++ b/target/snitch_cluster/sw/runtime/rtl-no-fesvr/src/putchar.c
@@ -0,0 +1,8 @@
+// Copyright 2020 ETH Zurich and University of Bologna.
+// Licensed under the Apache License, Version 2.0, see LICENSE for details.
+// SPDX-License-Identifier: Apache-2.0
+
+// Provide an implementation for putchar.
+void snrt_putchar(char character) {
+    *(volatile uint32_t *)0x0d000008 = character;
+}
diff --git a/target/snitch_cluster/sw/runtime/rtl-no-fesvr/src/snitch_cluster_start.S b/target/snitch_cluster/sw/runtime/rtl-no-fesvr/src/snitch_cluster_start.S
new file mode 100644
index 000000000..93259b880
--- /dev/null
+++ b/target/snitch_cluster/sw/runtime/rtl-no-fesvr/src/snitch_cluster_start.S
@@ -0,0 +1,15 @@
+# Copyright 2023 ETH Zurich and University of Bologna.
+# Licensed under the Apache License, Version 2.0, see LICENSE for details.
+# SPDX-License-Identifier: Apache-2.0
+
+#define SNRT_INIT_INT_REGS
+#define SNRT_INIT_FP_REGS
+#define SNRT_INIT_GP
+#define SNRT_INIT_CORE_INFO
+#define SNRT_INIT_CLS
+#define SNRT_INIT_STACK
+#define SNRT_INIT_TLS
+#define SNRT_CRT0_PARK
+
+#include "snitch_cluster_defs.h"
+#include "start.S"
diff --git a/target/snitch_cluster/sw/runtime/rtl-no-fesvr/src/snitch_cluster_start.c b/target/snitch_cluster/sw/runtime/rtl-no-fesvr/src/snitch_cluster_start.c
new file mode 100644
index 000000000..eb2316229
--- /dev/null
+++ b/target/snitch_cluster/sw/runtime/rtl-no-fesvr/src/snitch_cluster_start.c
@@ -0,0 +1,18 @@
+// Copyright 2023 ETH Zurich and University of Bologna.
+// Licensed under the Apache License, Version 2.0, see LICENSE for details.
+// SPDX-License-Identifier: Apache-2.0
+
+#define SNRT_INIT_TLS
+#define SNRT_INIT_BSS
+#define SNRT_INIT_CLS
+#define SNRT_INIT_LIBS
+#define SNRT_CRT0_PRE_BARRIER
+#define SNRT_INVOKE_MAIN
+#define SNRT_CRT0_POST_BARRIER
+#define SNRT_CRT0_EXIT
+
+static inline volatile uint32_t* snrt_exit_code_destination() {
+    return (volatile uint32_t*)0x0d000000;
+}
+
+#include "start.c"
diff --git a/target/snitch_cluster/sw/runtime/rtl-no-fesvr/src/snrt.c b/target/snitch_cluster/sw/runtime/rtl-no-fesvr/src/snrt.c
new file mode 100644
index 000000000..860c64188
--- /dev/null
+++ b/target/snitch_cluster/sw/runtime/rtl-no-fesvr/src/snrt.c
@@ -0,0 +1,19 @@
+// Copyright 2023 ETH Zurich and University of Bologna.
+// Licensed under the Apache License, Version 2.0, see LICENSE for details.
+// SPDX-License-Identifier: Apache-2.0
+
+#include "snrt.h"
+
+#include "alloc.c"
+#include "cls.c"
+#include "cluster_interrupts.c"
+#include "dm.c"
+#include "dma.c"
+#include "eu.c"
+#include "kmp.c"
+#include "omp.c"
+#include "printf.c"
+#include "putchar.c"
+#include "snitch_cluster_start.c"
+#include "sync.c"
+#include "team.c"
diff --git a/target/snitch_cluster/sw/runtime/rtl-no-fesvr/src/snrt.h b/target/snitch_cluster/sw/runtime/rtl-no-fesvr/src/snrt.h
new file mode 100644
index 000000000..1902c0454
--- /dev/null
+++ b/target/snitch_cluster/sw/runtime/rtl-no-fesvr/src/snrt.h
@@ -0,0 +1,38 @@
+// Copyright 2023 ETH Zurich and University of Bologna.
+// Licensed under the Apache License, Version 2.0, see LICENSE for details.
+// SPDX-License-Identifier: Apache-2.0
+
+#pragma once
+
+#include <stddef.h>
+#include <stdint.h>
+
+// Snitch cluster specific
+#include "snitch_cluster_defs.h"
+#include "snitch_cluster_memory.h"
+
+// Forward declarations
+#include "alloc_decls.h"
+#include "cls_decls.h"
+#include "riscv_decls.h"
+#include "start_decls.h"
+#include "sync_decls.h"
+#include "team_decls.h"
+
+// Implementation
+#include "alloc.h"
+#include "cls.h"
+#include "cluster_interrupts.h"
+#include "dm.h"
+#include "dma.h"
+#include "dump.h"
+#include "eu.h"
+#include "kmp.h"
+#include "omp.h"
+#include "perf_cnt.h"
+#include "printf.h"
+#include "riscv.h"
+#include "snitch_cluster_global_interrupts.h"
+#include "ssr.h"
+#include "sync.h"
+#include "team.h"
diff --git a/target/snitch_cluster/sw/tests/Makefile b/target/snitch_cluster/sw/tests/Makefile
index 57b26d9a0..45ae67813 100644
--- a/target/snitch_cluster/sw/tests/Makefile
+++ b/target/snitch_cluster/sw/tests/Makefile
@@ -19,6 +19,8 @@ SRC_DIR     = $(ROOT)/sw/tests
 BUILDDIR    = $(ROOT)/target/snitch_cluster/sw/tests/build
 ifeq ($(SELECT_RUNTIME), banshee)
 RUNTIME_DIR = $(ROOT)/target/snitch_cluster/sw/runtime/banshee
+else ifeq ($(SELECT_RUNTIME), rtl-no-fesvr)
+RUNTIME_DIR = $(ROOT)/target/snitch_cluster/sw/runtime/rtl-no-fesvr
 else
 RUNTIME_DIR = $(ROOT)/target/snitch_cluster/sw/runtime/rtl
 endif