From 3b41d6019e1e8504a688ad29d52acb418f09bfc8 Mon Sep 17 00:00:00 2001
From: Matt Rossouw <matthew.rossouw@unsw.edu.au>
Date: Mon, 25 Nov 2024 18:47:44 +1100
Subject: [PATCH] Support for Cheshire on Digilent Genesys 2

---
 build_sdk.py                        | 15 +++++++++
 example/cheshire/hello/Makefile     | 50 +++++++++++++++++++++++++++++
 example/cheshire/hello/hello.c      | 16 +++++++++
 example/cheshire/hello/hello.system | 11 +++++++
 4 files changed, 92 insertions(+)
 create mode 100644 example/cheshire/hello/Makefile
 create mode 100644 example/cheshire/hello/hello.c
 create mode 100644 example/cheshire/hello/hello.system

diff --git a/build_sdk.py b/build_sdk.py
index 0dfda740..25ad98b6 100644
--- a/build_sdk.py
+++ b/build_sdk.py
@@ -280,6 +280,21 @@ class ConfigInfo:
             "hello": Path("example/star64/hello")
         }
     ),
+    BoardInfo(
+        name="cheshire",
+        arch=KernelArch.RISCV64,
+        gcc_cpu=None,
+        loader_link_address=0x90000000,
+        kernel_options={
+            "KernelIsMCS": True,
+            "KernelPlatform": "cheshire",
+            "KernelRiscvExtD": True,
+            "KernelRiscvExtF": True,
+        },
+        examples={
+            "hello": Path("example/cheshire/hello")
+        }
+    ),
 )
 
 SUPPORTED_CONFIGS = (
diff --git a/example/cheshire/hello/Makefile b/example/cheshire/hello/Makefile
new file mode 100644
index 00000000..81928b34
--- /dev/null
+++ b/example/cheshire/hello/Makefile
@@ -0,0 +1,50 @@
+#
+# Copyright 2024, UNSW
+#
+# SPDX-License-Identifier: BSD-2-Clause
+#
+ifeq ($(strip $(BUILD_DIR)),)
+$(error BUILD_DIR must be specified)
+endif
+
+ifeq ($(strip $(MICROKIT_SDK)),)
+$(error MICROKIT_SDK must be specified)
+endif
+
+ifeq ($(strip $(MICROKIT_BOARD)),)
+$(error MICROKIT_BOARD must be specified)
+endif
+
+ifeq ($(strip $(MICROKIT_CONFIG)),)
+$(error MICROKIT_CONFIG must be specified)
+endif
+
+TOOLCHAIN := riscv64-unknown-elf
+
+CC := $(TOOLCHAIN)-gcc
+LD := $(TOOLCHAIN)-ld
+AS := $(TOOLCHAIN)-as
+MICROKIT_TOOL ?= $(MICROKIT_SDK)/bin/microkit
+
+HELLO_OBJS := hello.o
+
+BOARD_DIR := $(MICROKIT_SDK)/board/$(MICROKIT_BOARD)/$(MICROKIT_CONFIG)
+
+IMAGES := hello.elf
+CFLAGS := -mstrict-align -nostdlib -ffreestanding -g -O3 -Wall  -Wno-unused-function -Werror -I$(BOARD_DIR)/include -march=rv64imafdc_zicsr_zifencei -mabi=lp64d
+LDFLAGS := -L$(BOARD_DIR)/lib
+LIBS := -lmicrokit -Tmicrokit.ld
+
+IMAGE_FILE = $(BUILD_DIR)/loader.img
+REPORT_FILE = $(BUILD_DIR)/report.txt
+
+all: $(IMAGE_FILE)
+
+$(BUILD_DIR)/%.o: %.c Makefile
+	$(CC) -c $(CFLAGS) $< -o $@
+
+$(BUILD_DIR)/hello.elf: $(addprefix $(BUILD_DIR)/, $(HELLO_OBJS))
+	$(LD) $(LDFLAGS) $^ $(LIBS) -o $@
+
+$(IMAGE_FILE) $(REPORT_FILE): $(addprefix $(BUILD_DIR)/, $(IMAGES)) hello.system
+	$(MICROKIT_TOOL) hello.system --search-path $(BUILD_DIR) --board $(MICROKIT_BOARD) --config $(MICROKIT_CONFIG) -o $(IMAGE_FILE) -r $(REPORT_FILE)
diff --git a/example/cheshire/hello/hello.c b/example/cheshire/hello/hello.c
new file mode 100644
index 00000000..c69bdaf9
--- /dev/null
+++ b/example/cheshire/hello/hello.c
@@ -0,0 +1,16 @@
+/*
+ * Copyright 2024, UNSW
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+#include <stdint.h>
+#include <microkit.h>
+
+void init(void)
+{
+    microkit_dbg_puts("hello, world\n");
+}
+
+void notified(microkit_channel ch)
+{
+}
diff --git a/example/cheshire/hello/hello.system b/example/cheshire/hello/hello.system
new file mode 100644
index 00000000..5436463c
--- /dev/null
+++ b/example/cheshire/hello/hello.system
@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+ Copyright 2024, UNSW
+
+ SPDX-License-Identifier: BSD-2-Clause
+-->
+<system>
+    <protection_domain name="hello" priority="254">
+        <program_image path="hello.elf" />
+    </protection_domain>
+</system>
\ No newline at end of file