From adcda5689472a9f67cff5a5e8bec75eb8b990913 Mon Sep 17 00:00:00 2001
From: "S.J.R. van Schaik" <stephan@whiteboxsystems.nl>
Date: Thu, 23 Mar 2017 15:18:13 +0000
Subject: [PATCH] fs: add initial code to create the partition table

---
 Makefile          |  1 +
 include/fs/part.h |  3 +++
 source/fs/part.c  | 40 ++++++++++++++++++++++++++++++++++++++++
 3 files changed, 44 insertions(+)
 create mode 100644 include/fs/part.h
 create mode 100644 source/fs/part.c

diff --git a/Makefile b/Makefile
index ab74411..f63e21e 100644
--- a/Makefile
+++ b/Makefile
@@ -24,6 +24,7 @@ obj-y += source/shell/flash.o
 obj-y += source/core/flash.o
 
 obj-y += source/fs/block.o
+obj-y += source/fs/part.o
 
 obj = $(addprefix $(BUILD)/, $(obj-y))
 
diff --git a/include/fs/part.h b/include/fs/part.h
new file mode 100644
index 0000000..77e6870
--- /dev/null
+++ b/include/fs/part.h
@@ -0,0 +1,3 @@
+#pragma once
+
+int part_create(struct flash_dev *dev);
diff --git a/source/fs/part.c b/source/fs/part.c
new file mode 100644
index 0000000..9fa51b5
--- /dev/null
+++ b/source/fs/part.c
@@ -0,0 +1,40 @@
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <flash.h>
+#include <macros.h>
+
+#include <fs/block.h>
+#include <fs/part.h>
+
+struct part_hdr {
+	char magic[8];
+	char rsv[24];
+} __attribute__((packed));
+
+struct part_entry {
+	char label[16];
+	uint32_t start, end;
+	uint32_t flags;
+	uint32_t rsv;
+} __attribute__((packed));
+
+#define PART_MAGIC "FL-PART\x7f"
+
+int part_create(struct flash_dev *dev)
+{
+	struct part_hdr hdr;
+
+	if (block_is_erased(dev, 0, 4 * KIB) != 0 &&
+		flash_erase(dev, 0, 4 * KIB) != 0)
+		return -1;
+
+	memset(&hdr, 0, sizeof hdr);
+	memcpy(hdr.magic, PART_MAGIC, sizeof hdr.magic);
+
+	if (flash_write(dev, 0, &hdr, sizeof hdr) != 0)
+		return -1;
+
+	return 0;
+}