[GOOD] BUILD 0.1.0.551 DATE 9/03/2011 AT 9:25 AM

====================================================
Mainly changed: HAL.FSs
+ Updated 'mount' call in floppy driver, now done after controller is
initialized
+ Added 'detect' function for FAT file systems
+ Implemented 'initdr' driver, however still bugged
+ Improved logger

Kernel/hal/filesys/fat/fat.c

@@ -0,0 +1,80 @@
+/*
+ * fat.c
+ *
+ *  Created on: Aug 31, 2011
+ *      Author: Tiberiu
+ */
+
+#include <fileio.h>
+#include <debugio.h>
+#include "fat.h"
+
+// Buffer should contain boot sector
+uint32 FatDetect (void* buffer)
+{
+	FatBootSector* boot = (FatBootSector*)buffer;
+	uint32 correct_features = 0;
+	uint32 total_features = 0;
+
+	// Try the asm 'jmp' instruction
+	if ((boot->bpb.AsmJmp[0] == 0x6B || boot->bpb.AsmJmp[0]==0xEB) && boot->bpb.AsmJmp[2] == 0x90)
+		correct_features++;
+	total_features ++;
+
+	// Try the OemId. First char is often 'm' or 'M' (mkdosfs or MSDOS??/MSWIN??)
+	if (boot->bpb.OemId[0] == 'm' || boot->bpb.OemId[0] == 'M') correct_features++;
+	total_features ++;
+
+	// Try the bytes per sector. Most often, it is 512.
+	if (boot->bpb.BytesPerSector == 512) correct_features++;
+	total_features ++;
+
+	// Try the sectors per cluster. This is always a power of 2.
+	uint8 sectclust = boot->bpb.SectorsPerCluster;
+	uint8 count = 0;
+	while (sectclust) { count += sectclust&1; sectclust>>=1; }
+	if (count != 1) return 0;
+
+	// Number of fats, can be 2 or (rarely) 1. Important feature.
+	if (boot->bpb.FatsCount == 1 || boot->bpb.FatsCount == 2) correct_features+=2;
+	total_features+=2;
+
+	// This tells us what type of disk this is. Usually values are above 0xf0.
+	if (boot->bpb.MediaDescriptorType >= 0xF0) correct_features++;
+	total_features++;
+
+	// Calculate number of clusters
+	uint32 clusters = (boot->bpb.TotalSectors * boot->bpb.SectorsPerCluster);
+	if (clusters == 0) clusters = (boot->bpb.TotalSectorsLarge * boot->bpb.SectorsPerCluster);
+	// Calculate fat type
+	uint32 fat = (clusters < 4085) ? 12 : 16 ;
+	if (clusters > 65524) fat = 32;
+
+
+	// Try the extended info
+	if (fat == 32) {
+		if (boot->ext.fat32.Signature == 0x28 || boot->ext.fat32.Signature == 0x29) correct_features++;
+		total_features++;
+	}
+
+	else {
+		if (boot->ext.fat16.Signature == 0x28 || boot->ext.fat16.Signature == 0x29) correct_features++;
+		total_features++;
+	}
+
+	Log("Fat", "Correct features: %u out of %u. Type should be fat%u.\n", correct_features, total_features, fat);
+	// See what we have.
+	if (correct_features > (total_features/2)) return 0; // insuficcient correct features?
+
+	return fat;	// return FAT type
+}
+
+
+void FatInstall()
+{
+	FileSystem fat12 = {0, "fat12", Fat12Detect, 0,0,0,0,0,0,0,0};
+	FileSystem fat16 = {0, "fat16", Fat16Detect, 0,0,0,0,0,0,0,0};
+	FileSystem fat32 = {0, "fat32", Fat32Detect, 0,0,0,0,0,0,0,0};
+
+	VfsInstallFs(&fat12); VfsInstallFs(&fat16); VfsInstallFs(&fat32);
+}