Reading from HDD is now possible !

3 files changed, 34 insertions, 8 deletions

diff --git a/Source/Kernel/VFS/Part.ns.cpp b/Source/Kernel/VFS/Part.ns.cpp
index 9ead6b5..415a150 100644
--- a/Source/Kernel/VFS/Part.ns.cpp
+++ b/Source/Kernel/VFS/Part.ns.cpp
@@ -1,5 +1,7 @@
 #include "Part.ns.h"
 
+#include <VTManager/SimpleVT.class.h>
+
 namespace Part {
 
 Vector<BlockDevice*> devices;
@@ -7,6 +9,21 @@ Vector<Partition*> partitions;
 
 void readPartitionTable(BlockDevice *dev) {	//TODO : read partition table from device
 	partitions.push(new Partition(dev, 0, 0, dev->blocks()));	//Insert whole device as a partition
+
+	u8int* mbr = (u8int*)Mem::alloc(dev->blockSize());
+	if (!dev->readBlocks(0, 1, mbr)) return;
+
+	mbr_entry_t* entries = (mbr_entry_t*)((u32int)mbr + 0x1BE);
+
+	for (u32int i = 0; i < 4; i++) {
+		if ((entries[i].bootable == 0 or entries[i].bootable == 0x80) and entries[i].id != 0
+			   	and entries[i].s_lba != 0 and entries[i].size != 0
+				and entries[i].s_lba < dev->blocks() and entries[i].size < dev->blocks()) {
+			partitions.push(new Partition(dev, i + 1, entries[i].s_lba, entries[i].size));
+		}
+	}
+
+	Mem::free(mbr);
 }
 
 void registerDevice(BlockDevice *dev) {
@@ -73,12 +90,8 @@ BlockDevice* dev(String _class, u32int idx) {
 
 Partition* part(BlockDevice* dev, u32int idx) {
 	for (u32int i = 0; i < partitions.size(); i++) {
-		if (partitions[i]->getDevice() == dev) {
-			if (idx == 0) {
-				return partitions[i];
-			} else {
-				idx--;
-			}
+		if (partitions[i]->getDevice() == dev && partitions[i]->getPartNumber() == idx) {
+			return partitions[i];
 		}
 	}
 	return NULL;
diff --git a/Source/Kernel/VFS/Part.ns.h b/Source/Kernel/VFS/Part.ns.h
index 992f6f3..e6a358c 100644
--- a/Source/Kernel/VFS/Part.ns.h
+++ b/Source/Kernel/VFS/Part.ns.h
@@ -6,6 +6,19 @@
 #include <VFS/Partition.class.h>
 
 namespace Part {
+	struct mbr_entry_t {
+			u8int   bootable;       /* 0 = no, 0x80 = bootable */
+			u8int   s_head;         /* Starting head */
+			u16int  s_sector : 6;   /* Starting sector */
+			u16int  s_cyl    : 10;  /* Starting cylinder */
+			u8int   id;             /* System ID */
+			u8int   e_head;         /* Ending head */
+			u16int  e_sector : 6;   /* Ending sector */
+			u16int  e_cyl    : 10;  /* Ending cylinder */
+			u32int  s_lba;          /* Starting sector (LBA value) */
+			u32int  size;           /* Total sector number */
+	} __attribute__ ((packed));
+
 	extern Vector<BlockDevice*> devices;
 	extern Vector<Partition*> partitions;
 
diff --git a/Source/Kernel/VFS/Partition.class.cpp b/Source/Kernel/VFS/Partition.class.cpp
index 8d7de9b..9da3461 100644
--- a/Source/Kernel/VFS/Partition.class.cpp
+++ b/Source/Kernel/VFS/Partition.class.cpp
@@ -13,12 +13,12 @@ Partition::Partition(BlockDevice* dev, u8int partnumber, u64int startblock, u64i
 
 bool Partition::readBlocks(u64int startblock, u32int count, u8int *data) {
 	if (startblock + count > m_startblock + m_blockcount) return false;
-	return m_cache.readBlocks(startblock - m_startblock, count, data);
+	return m_cache.readBlocks(startblock + m_startblock, count, data);
 }
 
 bool Partition::writeBlocks(u64int startblock, u32int count, u8int *data) {
 	if (startblock + count > m_startblock + m_blockcount) return false;
-	return m_cache.writeBlocks(startblock - m_startblock, count, data);
+	return m_cache.writeBlocks(startblock + m_startblock, count, data);
 }
 
 bool Partition::read(u64int start, u32int length, u8int *data) {