fat32 stub

Cargo.lock

@@ -390,7 +390,7 @@ dependencies = [
 [[package]]
 name = "hbbytecode"
 version = "0.1.0"
-source = "git+https://git.ablecorp.us/AbleOS/holey-bytes.git#c133c2dbe71b3f1e1142bacef200775ae0c1d22d"
+source = "git+https://git.ablecorp.us/AbleOS/holey-bytes.git#254d5ed96234c8291770d84b2ac11ef7dd403b28"
 
 [[package]]
 name = "hbbytecode"
@@ -400,7 +400,7 @@ source = "git+https://git.ablecorp.us/ableos/holey-bytes#c133c2dbe71b3f1e1142bac
 [[package]]
 name = "hblang"
 version = "0.1.0"
-source = "git+https://git.ablecorp.us/AbleOS/holey-bytes.git#c133c2dbe71b3f1e1142bacef200775ae0c1d22d"
+source = "git+https://git.ablecorp.us/AbleOS/holey-bytes.git#254d5ed96234c8291770d84b2ac11ef7dd403b28"
 dependencies = [
  "hbvm 0.1.0 (git+https://git.ablecorp.us/AbleOS/holey-bytes.git)",
 ]
@@ -408,7 +408,7 @@ dependencies = [
 [[package]]
 name = "hbvm"
 version = "0.1.0"
-source = "git+https://git.ablecorp.us/AbleOS/holey-bytes.git#c133c2dbe71b3f1e1142bacef200775ae0c1d22d"
+source = "git+https://git.ablecorp.us/AbleOS/holey-bytes.git#254d5ed96234c8291770d84b2ac11ef7dd403b28"
 dependencies = [
  "hbbytecode 0.1.0 (git+https://git.ablecorp.us/AbleOS/holey-bytes.git)",
 ]

sysdata/libraries/stn/src/acs.hb

@@ -0,0 +1,8 @@
+//! This is a reserved file for use with the AbleOS Clustering System
+
+HostID := int
+// A DeviceID points to a specific device in the ACS.
+DeviceID := struct {
+	host_id: HostID,
+	id: int,
+}

sysdata/libraries/stn/src/file_io.hb

@@ -0,0 +1,27 @@
+// TODO: This is a bad path struct and should be better thoughtout.
+Path := struct {length: u8, data: ^u8}
+
+FileID := struct {
+	host_id: int,
+	id: int,
+}
+
+open := fn(file_path: Path): FileID {
+}
+close := fn(file_id: FileID): int {
+}
+// This reads in page_count of pages out of the file. If file_size is less than an exact multiple of pages do something.
+// TODO: Figureout how to encode errors.
+read_pages := fn(file_id: FileID, offset: int, page_count: int): void {
+}
+
+// This writes out page_count of pages out of the file.
+write_pages := fn(file_id: FileID, offset: int, page_count: int): void {
+}
+
+// This reads out byte_count of bytes from the file.
+read_bytes := fn(file_id: FileID, offset: int, byte_count: int): void {
+}
+
+write_bytes := fn(file_id: FileID, offset: int, byte_count: int): void {
+}

sysdata/libraries/stn/src/lib.hb

@@ -1,7 +1,10 @@
+acs := @use("rel:acs.hb")
+
 string := @use("rel:string.hb")
 log := @use("rel:log.hb")
 memory := @use("rel:memory.hb")
 buffer := @use("rel:buffer.hb")
 math := @use("rel:math.hb")
 random := @use("rel:random.hb")
-pci := @use("rel:pci.hb")
+pci := @use("rel:pci.hb")
+file := @use("rel:file_io.hb")

sysdata/programs/filesystem_fat32/README.md

@@ -0,0 +1 @@
+# filesystem_fat32

sysdata/programs/filesystem_fat32/meta.toml

@@ -0,0 +1,11 @@
+[package]
+name = "filesystem_fat32"
+authors = [""]
+
+[dependants.libraries]
+
+[dependants.binaries]
+hblang.version = "1.0.0"
+
+[build]
+command = "hblang src/main.hb"

sysdata/programs/filesystem_fat32/src/attributes.hb

@@ -0,0 +1,7 @@
+READ_ONLY := 0x1
+HIDDEN := 0x2
+SYSTEM := 0x4
+VOLUME_ID := 0x8
+DIRECTORY := 0x10
+ARCHIVE := 0x20
+LFN := READ_ONLY | HIDDEN | SYSTEM | VOLUME_ID

sysdata/programs/filesystem_fat32/src/bios_parameter_block.hb

@@ -0,0 +1,165 @@
+stn := @use("../../../libraries/stn/src/lib.hb");
+.{string, memory, buffer, log} := stn
+
+VALID_JUMP_BYTES := [u8].(0xEB, 0x3C, 0x90)
+
+OemIdent := struct {
+	dos_version: [u8; 8],
+	dos_version_name: [u8; 8],
+}
+
+new_oem_ident := fn(major: int, minor: int): OemIdent {
+	ver := [u8].(0, 0, 0, 0, 0, 0, 0, 0)
+	return OemIdent.(ver, ver)
+}
+
+BiosParameterBlock := struct {
+	jump_bytes: [u8; 3],
+	oem_ident: OemIdent,
+	bytes_per_sector: u16,
+	sectors_per_cluster: u8,
+	reserved_sectors: u16,
+	// The amount of FileAllocationTables on the disk. Often 2.
+	fat_count: u8,
+	root_directory_count: u16,
+	// if 0 then refer to large_sector_count
+	total_sectors: u16,
+	media_type: u8,
+	// if 0 refer to sectors_per_fat in the ExtendedBootRecord
+	sectors_per_fat: u16,
+	sectors_per_track: u16,
+	head_count: u16,
+	hidden_sectors: u32,
+	large_sector_count: u32,
+}
+
+bpb_sanity_check := fn(bpb: BiosParameterBlock): int {
+	return 0
+}
+
+new_bpb := fn(): BiosParameterBlock {
+	oem := new_oem_ident(0, 0)
+
+	return BiosParameterBlock.(VALID_JUMP_BYTES, oem, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0)
+}
+
+sector_count := fn(bpb: BiosParameterBlock): u32 {
+	if bpb.total_sectors == 0 {
+		return bpb.large_sector_count
+	} else {
+		return bpb.total_sectors
+	}
+}
+
+FatVersionNumber := struct {
+	major_version: u8,
+	minor_version: u8,
+}
+
+FormatReservation := [u8; 12]
+
+// Padded with spaces.
+VolumeName := [u8; 11]
+
+SystemIdentifierString := [u8; 8]
+VALID_SYSTEM_IDENTIFIER_STRING := [u8].(46, 41, 54, 33, 32, 20, 20, 20)
+BOOTABLE_PARTITION_SIGNATURE := 0xAA55
+
+BootCode := [u8; 420]
+
+ExtendedBootRecord := struct {
+	sectors_per_fat: u32,
+	flags: u16,
+	fat_version_number: FatVersionNumber,
+	// Typically set to 2.
+	root_directory_cluster_number: u32,
+	fsinfo_structure: u16,
+	backup_boot_sector: u16,
+	// When a volume is formated these bytes should be zero. As a sanity check I guess?
+	format_reserved: FormatReservation,
+	// 0x00 floppy or 0x80 hard disk
+	drive_number: u8,
+	nt_reserved: u8,
+	// must be 0x28 or 0x29
+	signature: u8,
+	volume_id_serial: u32,
+	volume_id_name: VolumeName,
+	// The spec says this is always FAT32. Untrustworthy and another sanity check I guess.
+	system_identifier_string: SystemIdentifierString,
+	boot_code: BootCode,
+	partition_signature: u16,
+}
+
+ebr_sanity_check := fn(ebr: ExtendedBootRecord): int {
+	ret := 0
+	if ebr.drive_number != 0x0 | ebr.drive_number != 0x80 {
+		log.warn("EBR-Drive-Number sanity check failed\0")
+	}
+
+	if ebr.signature != 0x28 | ebr.signature != 0x29 {
+		log.warn("EBR-Signature sanity check failed\0")
+	}
+
+	if ebr.system_identifier_string != VALID_SYSTEM_IDENTIFIER_STRING {
+		log.warn("EBR-Signature-Identifier-String sanity check failed\0")
+	}
+	return 0
+}
+
+new_ebr := fn(): ExtendedBootRecord {
+	version := FatVersionNumber.(0, 0)
+	fmt_res := FormatReservation.(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0)
+	vol_name := @as([u8; 11], idk)
+	boot_code := @as([u8; 420], idk)
+
+	return ExtendedBootRecord.(
+		0,
+		0,
+		version,
+		0,
+		0,
+		0,
+		fmt_res,
+		0,
+		0,
+		0,
+		0,
+		vol_name,
+		VALID_SYSTEM_IDENTIFIER_STRING,
+		boot_code,
+		0,
+	)
+}
+
+VALID_LEAD_FS_INFO := 0x41615252
+VALID_TRAIL_FS_INFO := 0xAA550000
+
+FSInfo := struct {
+	// Must be 0x41615252 to indicate a valid FSInfo structure
+	lead_signature: u32,
+	lead_reserved: [u8; 480],
+	// If the value is 0xFFFFFFFF, then the free count is unknown and must be computed. However, this value might be incorrect and should at least be range checked (<= volume cluster count) 
+	last_known_free_cluster_count: u32,
+	last_known_avalible_cluster: u32,
+	trail_reserved: [u8; 12],
+	trail_signature: u32,
+}
+
+fs_info_sanity_check := fn(fs_info: FSInfo): int {
+	ret := 0
+	if fs_info.last_known_free_cluster_count == 0xFFFFFFFF {
+		ret &= 1
+		log.warn("Last known free cluster count unknown\0")
+	}
+	if fs_info.last_known_avalible_cluster == 0xFFFFFFFF {
+		ret &= 2
+		log.warn("Last known avalible cluster count unknown\0")
+	}
+	return ret
+}
+
+new_fs_info := fn(): FSInfo {
+	lead_reserved := @as([u8; 480], idk)
+	trail_reserved := @as([u8; 12], idk)
+	return FSInfo.(0, lead_reserved, 0, 0, trail_reserved, 0)
+}

sysdata/programs/filesystem_fat32/src/datetime.hb

@@ -0,0 +1,25 @@
+Date := struct {
+	year: u16,
+	month: u16,
+	day: u16,
+}
+Time := struct {
+	hour: u16,
+	minutes: u16,
+	seconds: u16,
+}
+
+compress_date := fn(year: u16, month: u16, day: u16): u16 {
+	return 0
+}
+decompress_date := fn(date: u16): Date {
+	return Date.(0, 0, 0)
+}
+
+compress_time := fn(hour: u16, minutes: u16, seconds: u16): u16 {
+	return 0
+}
+
+decompress_time := fn(time: u16): Time {
+	return Time.(0, 0, 0)
+}

sysdata/programs/filesystem_fat32/src/file.hb

@@ -0,0 +1,21 @@
+attributes := @use("rel:attributes.hb")
+datetime := @use("rel:datetime.hb")
+
+FileName := [u8; 11]
+
+// This is the File Allocation Table entry that tells us where on disk the File is.
+FileEntry := struct {
+	file_name: FileName,
+	attributes: u8,
+	// We could use this byte for something but we likely will not 
+	nt_reserved: u8,
+	hundredths_seconds_creation: u8,
+	creation_time: datetime.time,
+	creation_date: datetime.date,
+	last_accessed_date: datetime.date,
+	high_cluster_number: u16,
+	last_modification_time: datetime.time,
+	last_modification_date: datetime.date,
+	low_cluster_number: u16,
+	file_size: u32,
+}

sysdata/programs/filesystem_fat32/src/main.hb

@@ -0,0 +1,47 @@
+stn := @use("../../../libraries/stn/src/lib.hb");
+.{string, memory, buffer, log} := stn
+
+attributes := @use("rel:attributes.hb")
+datetime := @use("rel:datetime.hb")
+directory := @use("rel:file.hb")
+bios_parameter_block := @use("rel:bios_parameter_block.hb");
+.{bpb_sanity_check, ebr_sanity_check, fs_info_sanity_check} := bios_parameter_block;
+.{new_bpb, new_ebr, new_fs_info} := bios_parameter_block
+
+FAT12_THRESHOLD := 4085
+FAT16_THRESHOLD := 65525
+
+ExFAT := 0
+FAT12 := 1
+FAT16 := 2
+FAT32 := 3
+
+calculate_fat_type := fn(sector_size: int, total_clusters: int): int {
+	if sector_size == 0 {
+		return ExFAT
+	} else if total_clusters < 4085 {
+		return FAT12
+	} else if total_clusters < 65525 {
+		return FAT16
+	} else {
+		return FAT32
+	}
+}
+
+main := fn(): int {
+	bpb := new_bpb()
+	ebr := new_ebr()
+	fsi := new_fs_info()
+
+	fat_type := calculate_fat_type(1, 100)
+
+	if fat_type != FAT32 {
+		log.warn("filesystem_fat32 driver only supports Fat32.\0")
+	}
+
+	bpb_sanity_check(bpb)
+	ebr_sanity_check(ebr)
+	fs_info_sanity_check(fsi)
+
+	return 0
+}

sysdata/system_config.toml

@@ -44,5 +44,5 @@ resolution = "1024x768x24"
 [boot.limine.ableos.modules.svga_driver]
 path = "boot:///svga_driver.hbf"
 
-[boot.limine.ableos.modules.pumpkin_print]
+[boot.limine.ableos.modules.filesystem_fat32]
-path = "boot:///pumpkin_print.hbf"
+path = "boot:///filesystem_fat32.hbf"