From 23b76b617899adf9be859dcc33dd9be75b794dce Mon Sep 17 00:00:00 2001
From: Daniel Jobson <jobson@tillitis.se>
Date: Tue, 17 Sep 2024 14:54:19 +0200
Subject: [PATCH] Wip syscall function.

PoC of how a syscall could look like.
---
 hw/application_fpga/Makefile         |  9 +++--
 hw/application_fpga/fw/tk1/syscall.c | 58 ++++++++++++++++++++++++++++
 hw/application_fpga/fw/tk1/syscall.h | 35 +++++++++++++++++
 3 files changed, 99 insertions(+), 3 deletions(-)
 create mode 100644 hw/application_fpga/fw/tk1/syscall.c
 create mode 100644 hw/application_fpga/fw/tk1/syscall.h

diff --git a/hw/application_fpga/Makefile b/hw/application_fpga/Makefile
index be6e5f4..8eec96e 100644
--- a/hw/application_fpga/Makefile
+++ b/hw/application_fpga/Makefile
@@ -119,7 +119,8 @@ FIRMWARE_DEPS = \
 	$(P)/fw/tk1/htif.h \
 	$(P)/fw/tk1/rng.h \
 	$(P)/fw/tk1/mgmt_app.h \
-	$(P)/fw/tk1/storage.h
+	$(P)/fw/tk1/storage.h \
+	$(P)/fw/tk1/syscall.h
 
 FIRMWARE_OBJS = \
 	$(P)/fw/tk1/main.o \
@@ -137,7 +138,8 @@ FIRMWARE_OBJS = \
 	$(P)/fw/tk1/htif.o \
 	$(P)/fw/tk1/rng.o \
 	$(P)/fw/tk1/mgmt_app.o \
-	$(P)/fw/tk1/storage.o
+	$(P)/fw/tk1/storage.o \
+	$(P)/fw/tk1/syscall.o
 
 FIRMWARE_SOURCES = \
 	$(P)/fw/tk1/main.c \
@@ -154,7 +156,8 @@ FIRMWARE_SOURCES = \
 	$(P)/fw/tk1/htif.c \
 	$(P)/fw/tk1/rng.c \
 	$(P)/fw/tk1/mgmt_app.c \
-	$(P)/fw/tk1/storage.c
+	$(P)/fw/tk1/storage.c \
+	$(P)/fw/tk1/syscall.c
 
 TESTFW_OBJS = \
 	$(P)/fw/testfw/main.o \
diff --git a/hw/application_fpga/fw/tk1/syscall.c b/hw/application_fpga/fw/tk1/syscall.c
new file mode 100644
index 0000000..514c3c4
--- /dev/null
+++ b/hw/application_fpga/fw/tk1/syscall.c
@@ -0,0 +1,58 @@
+// Copyright (C) 2024 - Tillitis AB
+// SPDX-License-Identifier: GPL-2.0-only
+
+#include "syscall.h"
+#include "mgmt_app.h"
+#include "partition_table.h"
+#include "preload_app.h"
+#include "storage.h"
+
+#include <stdint.h>
+
+int syscall(syscall_t *ctx)
+{
+
+	partition_table_t part_table;
+	part_table_read(&part_table);
+
+	switch (ctx->syscall_no) {
+	case ALLOC_AREA:
+		return storage_allocate_area(&part_table);
+		break;
+
+	case DEALLOC_AREA:
+		return storage_deallocate_area(&part_table);
+		break;
+
+	case READ_DATA:
+		return storage_read_data(&part_table, ctx->offset, ctx->data,
+					 ctx->size);
+		break;
+
+	case WRITE_DATA:
+		return storage_write_data(&part_table, ctx->offset, ctx->data,
+					  ctx->size);
+		break;
+
+	case PRELOAD_STORE:
+		return preload_store(&part_table);
+		break;
+
+	case PRELOAD_DELETE:
+		return preload_delete(&part_table);
+		break;
+
+	case MGMT_APP_REGISTER:
+		return mgmt_app_register(&part_table);
+		break;
+
+	case MGMT_APP_UNREGISTER:
+		return mgmt_app_unregister(&part_table);
+		break;
+
+	default:
+		/* return -1 */
+		break;
+	}
+	return -1;
+}
diff --git a/hw/application_fpga/fw/tk1/syscall.h b/hw/application_fpga/fw/tk1/syscall.h
new file mode 100644
index 0000000..1ab7bd6
--- /dev/null
+++ b/hw/application_fpga/fw/tk1/syscall.h
@@ -0,0 +1,35 @@
+// Copyright (C) 2024 - Tillitis AB
+// SPDX-License-Identifier: GPL-2.0-only
+
+#ifndef SYSCALL_H
+#define SYSCALL_H
+
+#include "partition_table.h"
+
+#include <stdint.h>
+#include <stddef.h>
+
+
+typedef struct {
+	uint8_t syscall_no;
+	uint32_t offset;
+	uint8_t *data;
+	size_t size;
+	uint32_t *ctx;
+} syscall_t;
+
+enum syscall_cmd {
+	BLAKE2S = 0,
+	ALLOC_AREA,
+	DEALLOC_AREA,
+	WRITE_DATA,
+	READ_DATA,
+	PRELOAD_STORE,
+	PRELOAD_DELETE,
+	MGMT_APP_REGISTER,
+	MGMT_APP_UNREGISTER,
+};
+
+int syscall(syscall_t *ctx);
+
+#endif