From d133cc70b125efc1d6c992cb49ce1bca41cf580e Mon Sep 17 00:00:00 2001
From: Kimplul <kimi.h.kuparinen@gmail.com>
Date: Sun, 30 Apr 2023 17:47:00 +0300
Subject: refactor component tree

---
 src/components/bus/simple_bus.c           |  2 +-
 src/components/cpu/riscv/simple_riscv32.c | 58 +++++++++++++++++++++++++++++++
 src/components/mem/simple_mem.c           |  2 +-
 3 files changed, 60 insertions(+), 2 deletions(-)
 create mode 100644 src/components/cpu/riscv/simple_riscv32.c

(limited to 'src/components')

diff --git a/src/components/bus/simple_bus.c b/src/components/bus/simple_bus.c
index 23a6bc2..58e4132 100644
--- a/src/components/bus/simple_bus.c
+++ b/src/components/bus/simple_bus.c
@@ -5,7 +5,7 @@
 #include <gran/common.h>
 #include <gran/component.h>
 
-#include <gran/components/bus/simple_bus.h>
+#include <gran/bus/simple_bus.h>
 
 struct mem_region {
 	uintptr_t addr;
diff --git a/src/components/cpu/riscv/simple_riscv32.c b/src/components/cpu/riscv/simple_riscv32.c
new file mode 100644
index 0000000..1f19b1f
--- /dev/null
+++ b/src/components/cpu/riscv/simple_riscv32.c
@@ -0,0 +1,58 @@
+#include <gran/cpu/riscv/simple_riscv32.h>
+
+struct simple_riscv32 {
+	struct component component;
+
+	struct component *imem;
+	struct component *dmem;
+
+	/* have to be careful with x0 */
+	uint32_t regs[32];
+	uint32_t pc;
+};
+
+static uint32_t get_reg(struct simple_riscv32 *cpu, size_t i)
+{
+	assert(i < 32);
+
+	if (i == 0)
+		return 0;
+
+	return cpu->regs[i];
+}
+
+static void set_reg(struct simple_riscv32 *cpu, size_t i, uint32_t v)
+{
+	assert(i < 32);
+
+	if (i == 0)
+		return;
+
+	cpu->regs[i] = v;
+}
+
+static stat simple_riscv32_clock(struct simple_riscv32 *cpu)
+{
+	uint32_t insn = 0;
+	stat ret = read(cpu->imem, cpu->pc, sizeof(insn), &insn);
+	if (ret)
+		return ret;
+
+	/* @todo instruction decode and execution, not sure if this is too early
+	 * to start thinking about how to modularise stuff */
+	return OK;
+}
+
+struct componen *create_simple_riscv32(uint32_t start_pc, struct component *imem, struct component *dmem)
+{
+	struct component *new = calloc(1, sizeof(simple_riscv32));
+	if (!new)
+		return NULL;
+
+	new->component.clock = (clock_callback)simple_riscv32_clock;
+
+	new->pc = start_pc;
+	new->imem = imem;
+	new->dmem = dmem;
+	return new;
+}
diff --git a/src/components/mem/simple_mem.c b/src/components/mem/simple_mem.c
index bea68ed..52606e2 100644
--- a/src/components/mem/simple_mem.c
+++ b/src/components/mem/simple_mem.c
@@ -1,7 +1,7 @@
 #include <string.h>
 #include <stdlib.h>
 
-#include <gran/components/mem/simple_mem.h>
+#include <gran/mem/simple_mem.h>
 
 struct simple_mem {
 	struct component component;
-- 
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