runtime: Add rtl runtime that does not depend on fesvr

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)

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

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 <[email protected]>
+
+SRCS  = snitch_cluster_start.S
+SRCS += snrt.c
+
+include ../common/common.mk

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
+}

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;
+}

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"

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"

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"

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"

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