Added builder

bios/iso.asm

@@ -1,161 +0,0 @@
-; Simple ISO emulation with el torito
-
-; Fill until CD sector 0x10
-times (0x10*2048)-($-$$) db 0
-
-; Volume record
-;TODO: fill in more fields
-iso_volume_record:
-db 1 ; Type volume record
-db "CD001" ; Identifier
-db 1 ; Version
-db 0 ; Unused
-times 32 db ' ' ; System identifier
-.volume_id: ; Volume identifier
-db 'Redox OS'
-times 32-($-.volume_id) db ' '
-times 8 db 0 ; Unused
-db 0x15, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x15 ; Volume space size (0x15)
-times 32 db 0 ; Unused
-db 0x01, 0x00, 0x00, 0x01 ; Volume set size
-db 0x01, 0x00, 0x00, 0x01 ; Volume sequence number
-db 0x00, 0x08, 0x08, 0x00 ; Logical block size in little and big endian
-
-times 156-($-iso_volume_record) db 0
-
-; Root directory entry
-.root_directory:
-db 0x22 ; Length of entry
-db 0x00 ; Length of extended attributes
-db 0x14, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x14 ; Location of extent (0x14)
-db 0x00, 0x08, 0x00, 0x00, 0x00, 0x00, 0x08, 0x00 ; Size of extent
-db 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 ; Recording time
-db 0x02 ; File flags
-db 0x00 ; Interleaved file unit size
-db 0x00 ; Interleaved gap size
-db 0x01, 0x00, 0x00, 0x01 ; Volume sequence number
-db 0x01 ; Length of file identifier
-db 0x00 ; File identifier
-
-times 128 db ' ' ; Volume set identifier
-times 128 db ' ' ; Publisher identifier
-times 128 db ' ' ; Data preparer identifier
-times 128 db ' ' ; Application identifier
-times 37 db ' ' ; Copyright file ID
-times 37 db ' ' ; Abstract file ID
-times 37 db ' ' ; Bibliographic file ID
-
-times 881-($-iso_volume_record) db 0
-
-db 1 ; File structure version
-
-; Fill until CD sector 0x11
-times (0x11*2048)-($-$$) db 0
-
-; Boot record
-iso_boot_record:
-db 0 ; Type boot record
-db "CD001" ; Identifier
-db 1 ; Version
-db "EL TORITO SPECIFICATION" ; Boot system identifier
-times 0x47-($ - iso_boot_record) db 0 ; Padding
-dd 0x13 ; Sector of boot catalog
-
-; Fill until CD sector 0x12
-times (0x12*2048)-($-$$) db 0
-
-; Terminator
-iso_terminator:
-db 0xFF ; Type terminator
-db "CD001" ; Identifier
-db 1 ; Version
-
-; Fill until CD sector 0x13
-times (0x13*2048)-($-$$) db 0
-
-; Boot catalog
-iso_boot_catalog:
-
-; Validation entry
-.validation:
-db 1 ; Header ID
-db 0 ; Platform ID (x86)
-dw 0 ; Reserved
-times 24 db 0 ; ID string
-dw 0x55aa ; Checksum
-dw 0xaa55 ; Key
-
-; Default entry
-.default:
-db 0x88 ; Bootable
-db 4 ; Hard drive emulation
-dw 0 ; Load segment (0 is platform default)
-db 0xEE ; Partition type (0xEE is protective MBR)
-db 0 ; Unused
-dw 1 ; Sector count
-dd 0 ; Start address for virtual disk
-times 20 db 0 ; Padding
-
-; EFI section header entry
-.efi_section_header:
-db 0x91 ; Final header
-db 0xEF ; Platform ID (EFI)
-dw 1 ; Number of section header entries
-times 28 db 0 ; ID string
-
-; EFI section entry
-.efi_section_entry:
-db 0x88 ; Bootable
-db 0 ; No emulation
-dw 0 ; Load segment (0 is platform default)
-db 0 ; Partition type (not used)
-db 0 ; Unused
-dw 512 ; Sector count (1 MiB = 512 CD sectors)
-dd 512 ; Start address for virtual disk (1 MiB = 512 CD sectors)
-times 20 db 0 ; Padding
-
-; Fill until CD sector 0x14
-times (0x14*2048)-($-$$) db 0
-
-iso_root_directory:
-.self:
-db 0x22 ; Length of entry
-db 0x00 ; Length of extended attributes
-db 0x14, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x14 ; Location of extent (0x14)
-db 0x00, 0x08, 0x00, 0x00, 0x00, 0x00, 0x08, 0x00 ; Size of extent
-db 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 ; Recording time
-db 0x02 ; File flags
-db 0x00 ; Interleaved file unit size
-db 0x00 ; Interleaved gap size
-db 0x01, 0x00, 0x00, 0x01 ; Volume sequence number
-db 0x01 ; Length of file identifier
-db 0x00 ; File identifier
-
-.parent:
-db 0x22 ; Length of entry
-db 0x00 ; Length of extended attributes
-db 0x14, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x14 ; Location of extent (0x14)
-db 0x00, 0x08, 0x00, 0x00, 0x00, 0x00, 0x08, 0x00 ; Size of extent
-db 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 ; Recording time
-db 0x02 ; File flags
-db 0x00 ; Interleaved file unit size
-db 0x00 ; Interleaved gap size
-db 0x01, 0x00, 0x00, 0x01 ; Volume sequence number
-db 0x01 ; Length of file identifier
-db 0x01 ; File identifier
-
-.boot_cat:
-db 0x2C ; Length of entry
-db 0x00 ; Length of extended attributes
-db 0x13, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x13 ; Location of extent (0x13)
-db 0x00, 0x08, 0x00, 0x00, 0x00, 0x00, 0x08, 0x00 ; Size of extent
-db 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 ; Recording time
-db 0x00 ; File flags
-db 0x00 ; Interleaved file unit size
-db 0x00 ; Interleaved gap size
-db 0x01, 0x00, 0x00, 0x01 ; Volume sequence number
-db 0x0A ; Length of file identifier
-db "BOOT.CAT;1",0 ; File identifier
-
-; Fill until CD sector 0x15
-times (0x15*2048)-($-$$) db 0

bios/main.asm

@@ -1,31 +0,0 @@
-sectalign off
-
-; stage 1 is sector 0, loaded at 0x7C00
-%include "stage1.asm"
-
-; GPT area from sector 1 to 33, loaded at 0x7E00
-times (33*512) db 0
-
-; stage 2, loaded at 0xC000
-stage2:
-    %include "stage2.asm"
-    align 512, db 0
-stage2.end:
-
-; the maximum size of stage2 is 4 KiB
-times (4*1024)-($-stage2) db 0
-
-; ISO compatibility, uses up space until 0x12400
-%include "iso.asm"
-
-times 3072 db 0 ; Pad to 0x13000
-
-; stage3, loaded at 0x13000
-stage3:
-    %defstr STAGE3_STR %[STAGE3]
-    incbin STAGE3_STR
-    align 512, db 0
-.end:
-
-; the maximum size of the boot loader portion is 384 KiB
-times (384*1024)-($-$$) db 0

bootloader/.gitignore

@@ -0,0 +1 @@
+build

bootloader/Makefile

@@ -0,0 +1,48 @@
+# Build script for BIOS (legacy) boot.
+#
+# This compiles our bootloader as a static library,
+# and wraps it in a multistage loader.
+
+
+BUILD = ./build
+BIOS_BUILD = $(BUILD)/bios
+
+STAGE2_SECTOR=34
+
+.PHONY: all
+all: $(BIOS_BUILD)/bios.mbr.bin $(BIOS_BUILD)/bios.stage2.bin
+
+.PHONY: clean
+clean:
+	rm -drf $(BUILD)
+
+include bios.mk
+
+# Compile bootloader as library
+LIB_SRC = ./bootloader/Cargo.toml ./bootloader/Cargo.lock $(shell find ./bootloader/src -type f)
+$(BUILD)/bios.lib: $(LIB_SRC)
+	@mkdir -p $(BUILD)
+	env RUSTFLAGS="-C soft-float" \
+	cargo rustc \
+		--manifest-path="./bootloader/Cargo.toml" \
+		-Z build-std=core,alloc \
+		-Z build-std-features=compiler-builtins-mem \
+		--target "./bootloader/targets/x86-unknown-none.json" \
+		--lib \
+		--release \
+		-- \
+		--emit link="$(CURDIR)/$@"
+
+# Link bootloader
+BIOS_LD = ./bootloader/linkers/x86-unknown-none.ld
+$(BUILD)/bios.elf: $(BUILD)/bios.lib $(BIOS_LD)
+	ld \
+		-m elf_i386 \
+		--gc-sections \
+		-z max-page-size=0x1000 \
+		-T "$(BIOS_LD)" \
+		-o "$@" \
+		"$<"
+
+	objcopy --only-keep-debug "$@" "$@.sym"
+	objcopy --strip-debug "$@"

bootloader/bios.mk

@@ -0,0 +1,30 @@
+# Expects variables:
+# STAGE3: path to linked stage 3 binary
+# STAGE2_SECTOR: the index of the first sector
+# of the stage 2 binary on the disk it will be written to.
+
+BIOS_SRC = ./bios
+
+# Wrap bootloader in three-stage BIOS loader
+$(BIOS_BUILD)/bios.bin: $(wildcard $(BIOS_SRC)/*.asm) $(BUILD)/bios.elf
+	@mkdir -p "$(BIOS_BUILD)"
+	nasm \
+		-f bin \
+		-D STAGE3="$(BUILD)/bios.elf" \
+		-D STAGE2_SECTOR=$(STAGE2_SECTOR) \
+		-o "$@" \
+		-l "$@.lst" \
+		-i "$(BIOS_SRC)" \
+		"$(BIOS_SRC)/main.asm"
+
+# Extract MBR (first 440 bytes)
+$(BIOS_BUILD)/bios.mbr.bin: $(BIOS_BUILD)/bios.bin
+	@mkdir -p "$(BIOS_BUILD)"
+	@echo ""
+	dd if="$(BIOS_BUILD)/bios.bin" bs=440 count=1 of="$@"
+
+# Extract stage 2 (rest of file)
+$(BIOS_BUILD)/bios.stage2.bin: $(BIOS_BUILD)/bios.bin
+	@mkdir -p "$(BIOS_BUILD)"
+	@echo ""
+	dd if="$(BIOS_BUILD)/bios.bin" bs=512 skip=1 of="$@"

bootloader/bios/defs.asm

@@ -0,0 +1,4 @@
+; sector = 512 bytes
+
+; first sector of stage 2, on disk.
+%assign PARAM_STAGE2_SECTOR 34

bootloader/bios/main.asm

@@ -0,0 +1,70 @@
+sectalign off
+
+; This program expects two external macros:
+; STAGE3, a path to the stage3 binary
+; STAGE2_SECTOR, the location of stage 2
+;   on the disk, in 512-byte sectors.
+; On a gpt disk, this is probably 34.
+
+; Stage 1 is MBR code, and should fit in LBA 0
+; (512 bytes). Layout is as follows:
+; (Format is `offset, length: purpose`)
+; 0, 424: x86 boot code
+; 440, 4: Unique disk signature
+; 444, 2: unknown
+; 446, 16*4: Array of four legacy MBR records
+; 510, 2: signature 0x55 0xAA
+; 512 to end  of logical block: reserved
+; 
+; See https://uefi.org/specs/UEFI/2.10/05_GUID_Partition_Table_Format.html
+
+ORG 0x7C00
+SECTION .text
+
+; stage 1 is sector 0, loaded into memory at 0x7C00
+%include "stage1.asm"
+
+; Stage 1 is at most 440 bytes
+times 440-($-$$) db 0
+db 0xee
+
+; Pad until 512
+times 510-($-$$) db 0
+
+; MBR signature.
+; This isn't loaded into memory, it's
+; only here for debugging.
+db 0x55
+db 0xaa
+
+; LEGACY
+; GPT area from sector 1 to 33, loaded at 0x7E00
+;times (33*512) db 0
+
+stage2:
+    %include "stage2.asm"
+    align 512, db 0
+stage2.end:
+
+; TODO: why? Stage 1 read limit?
+; Can we make this smaller?
+; The maximum size of stage2 is 4 KiB,
+; This fill will throw an error if the subtraction
+; is negative.
+times (4*1024)-($-stage2) db 0
+
+; LEGACY
+; Pad to 0x13000
+; This needs to match the value configured
+; in the stage3 linker script
+times (0x13000 - 0x7c00)-($-$$) db 0
+
+stage3:
+    %defstr STAGE3_STR %[STAGE3]
+    incbin STAGE3_STR
+    align 512, db 0
+.end:
+
+; TODO: why? Of the disk, or of memory?
+; the maximum size of the boot loader portion is 384 KiB
+times (384*1024)-($-$$) db 0

bootloader/bios/stage1.asm

@@ -1,5 +1,3 @@
-ORG 0x7C00
-SECTION .text
 USE16
 
 stage1: ; dl comes with disk
@@ -18,7 +16,6 @@ stage1: ; dl comes with disk
     retf
 
 .set_cs:
-
     ; save disk number
     mov [disk], dl
 
@@ -48,8 +45,19 @@ stage1: ; dl comes with disk
     and cl, 0x3f
     mov [chs.s], cl
 
-    mov eax, (stage2 - stage1) / 512
+    ; PARAM stage1 0x7C00
+    ; PARAM stage2 0xC000
+    ; PARAM stage3.end 0x4b600
+
+    ; disk address of stage 2
+    ; (start sector)
+    mov eax, STAGE2_SECTOR
+
+    ; where to load stage 2
     mov bx, stage2
+
+    ; length of stage2 + stage3
+    ; (on disk, in sectors)
     mov cx, (stage3.end - stage2) / 512
     mov dx, 0
     call load
@@ -92,7 +100,40 @@ load:
     mov [DAPACK.count], cx
     mov [DAPACK.seg], dx
 
-    call print_dapack
+; This should be a subroutine, 
+; but we don't call/ret to save a few bytes.
+; (we only use this once)
+;
+;call print_dapack
+;print_dapack:
+    mov bx, [DAPACK.addr + 2]
+    call print_hex
+
+    mov bx, [DAPACK.addr]
+    call print_hex
+
+    mov al, '#'
+    call print_char
+
+    mov bx, [DAPACK.count]
+    call print_hex
+
+    mov al, ' '
+    call print_char
+
+    mov bx, [DAPACK.seg]
+    call print_hex
+
+    mov al, ':'
+    call print_char
+
+    mov bx, [DAPACK.buf]
+    call print_hex
+
+    call print_line
+    ;ret
+    ; End of print_dapack
+
 
     cmp byte [chs.s], 0
     jne .chs
@@ -146,35 +187,6 @@ load:
     jc error ; carry flag set on error
     ret
 
-print_dapack:
-    mov bx, [DAPACK.addr + 2]
-    call print_hex
-
-    mov bx, [DAPACK.addr]
-    call print_hex
-
-    mov al, '#'
-    call print_char
-
-    mov bx, [DAPACK.count]
-    call print_hex
-
-    mov al, ' '
-    call print_char
-
-    mov bx, [DAPACK.seg]
-    call print_hex
-
-    mov al, ':'
-    call print_char
-
-    mov bx, [DAPACK.buf]
-    call print_hex
-
-    call print_line
-
-    ret
-
 error_chs:
     mov ah, 0
 
@@ -185,12 +197,10 @@ error:
     mov bl, ah
     call print_hex
 
-    mov al, ' '
+    mov si, stage1_error_msg
-    call print_char
-
-    mov si, error_msg
     call print
     call print_line
+
 .halt:
     cli
     hlt
@@ -199,7 +209,7 @@ error:
 %include "print.asm"
 
 stage_msg: db "Stage ",0
-error_msg: db "ERROR",0
+stage1_error_msg: db " ERROR",0
 
 disk: db 0
 
@@ -216,7 +226,4 @@ DAPACK:
 .seg:   dw 0 ; in memory page zero
 .addr:  dq 0 ; put the lba to read in this spot
 
-times 446-($-$$) db 0
+db 0xff
-partitions: times 4 * 16 db 0
-db 0x55
-db 0xaa

bootloader/bios/stage2.asm

@@ -2,6 +2,13 @@ SECTION .text
 USE16
 
 stage2.entry:
+    mov si, stage_msg
+    call print
+    mov al, '3'
+    call print_char
+    call print_line
+
+
     ; check for required features
     call cpuid_check
 

builder/.editorconfig

@@ -0,0 +1,9 @@
+root = true
+
+[*]
+indent_style = tab
+indent_size = 4
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = false
+insert_final_newline = false

builder/.gitignore

@@ -0,0 +1 @@
+/target

builder/Cargo.lock

@@ -0,0 +1,316 @@
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+# It is not intended for manual editing.
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+
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+ "getrandom",
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+ "windows_aarch64_gnullvm",
+ "windows_aarch64_msvc",
+ "windows_i686_gnu",
+ "windows_i686_gnullvm",
+ "windows_i686_msvc",
+ "windows_x86_64_gnu",
+ "windows_x86_64_gnullvm",
+ "windows_x86_64_msvc",
+]
+
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+
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builder/Cargo.toml

@@ -0,0 +1,58 @@
+[package]
+name = "builder"
+version = "0.1.0"
+edition = "2021"
+
+#
+# MARK: lints
+#
+
+[workspace.lints.rust]
+unused_import_braces = "deny"
+unit_bindings = "deny"
+single_use_lifetimes = "deny"
+non_ascii_idents = "deny"
+macro_use_extern_crate = "deny"
+elided_lifetimes_in_paths = "deny"
+absolute_paths_not_starting_with_crate = "deny"
+explicit_outlives_requirements = "warn"
+unused_crate_dependencies = "warn"
+redundant_lifetimes = "warn"
+missing_docs = "allow"
+
+[workspace.lints.clippy]
+needless_return = "allow"
+new_without_default = "allow"
+tabs_in_doc_comments = "allow"
+expect_used = "deny"
+dbg_macro = "deny"
+allow_attributes = "deny"
+create_dir = "deny"
+filetype_is_file = "deny"
+integer_division = "deny"
+lossy_float_literal = "deny"
+map_err_ignore = "deny"
+mutex_atomic = "deny"
+needless_raw_strings = "deny"
+print_stderr = "deny"
+print_stdout = "deny"
+str_to_string = "deny"
+string_add = "deny"
+string_to_string = "deny"
+unimplemented = "deny"
+use_debug = "deny"
+verbose_file_reads = "deny"
+large_types_passed_by_value = "deny"
+match_on_vec_items = "deny"
+wildcard_dependencies = "deny"
+negative_feature_names = "deny"
+redundant_feature_names = "deny"
+
+#
+# MARK: dependencies
+#
+
+[dependencies]
+anstyle = "1.0.10"
+clap = { version = "4.5.23", features = ["derive"] }
+gpt = "4.0.0"

builder/rustfmt.toml

@@ -0,0 +1 @@
+hard_tabs = true

builder/src/cmd/disk.rs

@@ -0,0 +1,228 @@
+use clap::Subcommand;
+use std::fs::{File, OpenOptions};
+use std::io::{Read, Write};
+use std::path::{Path, PathBuf};
+
+use crate::gpt::{GPTDisk, PartitionType};
+use crate::util::parse_bytes_postfix;
+
+#[derive(Subcommand, Debug)]
+pub enum DiskCommand {
+	/// Create an empty file of the given size
+	Create {
+		/// The new file's size, in bytes.
+		/// May be followed by the usual SI prefixes:
+		/// - K, M, G, T for powers of 10
+		/// - Kib,Mib,Gib,Tib for powers of 1024
+		size: String,
+	},
+
+	/// Initialize partition table on the given disk
+	Init {},
+
+	/// Show GPT information.
+	///
+	/// By default, this command dumps GPT headers & partitons.
+	/// Use the flags below to compute other values.
+	#[command(alias = "i")]
+	Inspect {
+		/// Show index of first byte of partition
+		#[clap(long, group = "inspect-mode", value_name = "PARTITION")]
+		part_start: Option<u32>,
+
+		/// Show index of sector of partition
+		#[clap(long, group = "inspect-mode", value_name = "PARTITION")]
+		part_start_sector: Option<u32>,
+	},
+
+	/// Initialize partition table on the given disk
+	#[command(alias = "addpart")]
+	AddPartition {
+		/// The partition's name
+		name: String,
+
+		/// The partition's size, in bytes.
+		/// May be followed by the usual SI prefixes:
+		/// - K, M, G, T for powers of 10
+		/// - Kib,Mib,Gib,Tib for powers of 1024
+		size: String,
+
+		/// The type of this partition
+		partition_type: PartitionType,
+	},
+
+	/// Write a file to the given partition
+	#[command(alias = "writepart")]
+	WritePartition {
+		/// The index of the partition to write to
+		part_idx: u32,
+
+		/// The data to write
+		source: PathBuf,
+	},
+
+	/// Write a BIOS bootloader to this disk
+	SetBootCode {
+		/// The data to write.
+		/// This file must contain exactly 440 bytes.
+		source: PathBuf,
+	},
+}
+
+impl DiskCommand {
+	pub fn run(&self, file: &Path) {
+		match self {
+			Self::Inspect {
+				part_start,
+				part_start_sector,
+			} => {
+				let file = OpenOptions::new()
+					.create(false)
+					.append(false)
+					.write(false)
+					.read(true)
+					.open(file)
+					.unwrap();
+
+				let mut dw = GPTDisk::new(file);
+
+				if let Some(part) = part_start {
+					println!("{}", dw.get_partition(*part).unwrap().start());
+				} else if let Some(part) = part_start_sector {
+					assert!(dw.get_partition(*part).unwrap().start() % 512 == 0);
+					println!("{}", dw.get_partition(*part).unwrap().start() / 512);
+				} else {
+					let disk = dw.disk(false);
+					println!("Disk header: {:#?}", disk.primary_header());
+					println!("Partition layout: {:#?}", disk.partitions());
+				}
+			}
+
+			Self::Create { size } => {
+				let size = match parse_bytes_postfix(&size) {
+					Some(x) => x,
+					None => panic!("Bad byte string"),
+				};
+
+				if file.exists() {
+					panic!("file exists")
+				}
+
+				let mut file = File::create(file).unwrap();
+
+				let mut buffer = [0; 1024];
+				let buffer_len: u64 = buffer.len().try_into().unwrap();
+				let mut remaining_size = size;
+
+				while remaining_size > 0 {
+					let to_write = remaining_size.min(buffer_len);
+					let to_write_usize: usize = to_write.try_into().unwrap();
+
+					let buffer = &mut buffer[..to_write_usize];
+					file.write(buffer).unwrap();
+
+					remaining_size -= to_write;
+				}
+			}
+
+			Self::Init {} => {
+				let file = OpenOptions::new()
+					.create(false)
+					.append(false)
+					.write(true)
+					.read(true)
+					.open(file)
+					.unwrap();
+
+				let mut dw = GPTDisk::new(file);
+
+				dw.init();
+			}
+
+			Self::AddPartition {
+				name,
+				size,
+				partition_type,
+			} => {
+				let file = OpenOptions::new()
+					.create(false)
+					.append(false)
+					.write(true)
+					.read(true)
+					.open(file)
+					.unwrap();
+
+				let size = match parse_bytes_postfix(&size) {
+					Some(x) => x,
+					None => panic!("Bad byte string"),
+				};
+
+				let mut dw = GPTDisk::new(file);
+				let mut disk = dw.disk(true);
+
+				disk.add_partition(name, size, partition_type.into(), 0, None)
+					.expect("failed to write disk");
+
+				disk.write().unwrap();
+			}
+
+			Self::WritePartition { part_idx, source } => {
+				let file = OpenOptions::new()
+					.create(false)
+					.append(false)
+					.write(true)
+					.read(true)
+					.open(file)
+					.unwrap();
+
+				let mut dw = GPTDisk::new(file);
+
+				let mut part = match dw.get_partition(*part_idx) {
+					Some(part) => part,
+					None => panic!("no such partition"),
+				};
+
+				let mut source = std::fs::File::open(source).unwrap();
+				let src_size = source.metadata().unwrap().len();
+
+				if src_size > part.len() {
+					panic!("file too big");
+				}
+
+				let n = std::io::copy(&mut source, &mut part).unwrap();
+				println!("wrote {n} bytes");
+			}
+
+			Self::SetBootCode { source } => {
+				let file = OpenOptions::new()
+					.create(false)
+					.append(false)
+					.write(true)
+					.read(true)
+					.open(file)
+					.unwrap();
+
+				let mut src = OpenOptions::new()
+					.create(false)
+					.append(false)
+					.write(false)
+					.read(true)
+					.open(source)
+					.unwrap();
+
+				if src.metadata().unwrap().len() != 440 {
+					panic!(
+						"Bad MBR size {}, expected 440.",
+						src.metadata().unwrap().len()
+					)
+				}
+
+				let mut mbr = [0u8; 440];
+				src.read_exact(&mut mbr).unwrap();
+
+				let mut dw = GPTDisk::new(file);
+				dw.set_boot_code(mbr);
+			}
+		}
+	}
+}

builder/src/cmd/mod.rs

@@ -0,0 +1,25 @@
+mod disk;
+
+use clap::Subcommand;
+use std::path::PathBuf;
+
+#[derive(Subcommand, Debug)]
+pub enum Command {
+	/// Disk utilities
+	#[command(alias = "d")]
+	Disk {
+		/// The disk image to work on
+		file: PathBuf,
+
+		#[command(subcommand)]
+		command: disk::DiskCommand,
+	},
+}
+
+impl Command {
+	pub fn run(&self) {
+		match self {
+			Self::Disk { command, file } => command.run(file),
+		}
+	}
+}

builder/src/gpt.rs

@@ -0,0 +1,272 @@
+use gpt::{partition_types, DiskDevice, GptDisk};
+use std::io::{Read, Seek, SeekFrom, Write};
+use std::str::FromStr;
+
+/// Convenience wrapper.
+/// Represents a disk with a GPT partition table
+pub struct GPTDisk<D: DiskDevice> {
+	device: D,
+	start_offset: u64,
+}
+
+impl<D: DiskDevice> GPTDisk<D> {
+	pub fn new(mut device: D) -> Self {
+		//TODO:error handling
+		let start_offset = device.stream_position().unwrap();
+
+		return Self {
+			device,
+			start_offset,
+		};
+	}
+
+	/// Re-initilaize this disk's GPT metadata.
+	/// This destroys data and creates a new, empty disk.
+	pub fn init(&mut self) {
+		let disk = gpt::GptConfig::new()
+			.writable(true)
+			.create_from_device(&mut self.device, None)
+			.expect("failed to open disk");
+
+		disk.write().unwrap();
+	}
+
+	/// Read this disk's partition table.
+	pub fn disk(&mut self, writable: bool) -> GptDisk<&mut D> {
+		self.device
+			.seek(SeekFrom::Start(self.start_offset))
+			.unwrap();
+
+		let disk = gpt::GptConfig::new()
+			.writable(writable)
+			.readonly_backup(!writable)
+			.open_from_device(&mut self.device)
+			.expect("failed to open disk");
+
+		return disk;
+	}
+
+	/// Get a handle to a partition on this disk
+	pub fn get_partition<'a>(&'a mut self, partition_idx: u32) -> Option<GPTPartition<'a, D>> {
+		let disk = self.disk(false);
+
+		let part = match disk.partitions().get(&partition_idx) {
+			Some(part) => part,
+			None => return None,
+		};
+
+		let lb_size = *disk.logical_block_size();
+		let start_byte = part.bytes_start(lb_size).unwrap();
+		let length = part.bytes_len(lb_size).unwrap();
+
+		return Some(GPTPartition {
+			disk: self,
+			start_byte,
+			length,
+			seek: 0,
+		});
+	}
+
+	/// Set this disk's boot code (first 440 bytes of MBR)
+	pub fn set_boot_code(&mut self, boot_code: [u8; 440]) {
+		let disk = self.disk(false);
+		let lbs = *disk.logical_block_size();
+		drop(disk);
+
+		self.device
+			.seek(SeekFrom::Start(self.start_offset))
+			.unwrap();
+
+		// Get or make MBR
+		let mut mbr = gpt::mbr::ProtectiveMBR::from_disk(&mut self.device, lbs).unwrap_or(
+			gpt::mbr::ProtectiveMBR::with_lb_size(lbs.as_u64().try_into().unwrap_or(0xFF_FF_FF_FF)),
+		);
+
+		mbr.set_bootcode(boot_code);
+
+		self.device.write_all(&mbr.to_bytes()).unwrap();
+	}
+}
+
+/// A view into a [`GPTDisk`]'s partition.
+pub struct GPTPartition<'a, D: DiskDevice> {
+	/// The disk this partition is on
+	disk: &'a mut GPTDisk<D>,
+
+	/// The index of the first byte of this partition inside its GPTDisk
+	start_byte: u64,
+
+	/// The length of this partition, in bytes.
+	length: u64,
+
+	/// The position we are reading/writing at within this file
+	seek: u64,
+}
+
+impl<'a, D: DiskDevice> Seek for GPTPartition<'a, D> {
+	fn seek(&mut self, pos: SeekFrom) -> std::io::Result<u64> {
+		match pos {
+			SeekFrom::Current(x) => {
+				if x.is_negative() {
+					let x: u64 = x.abs().try_into().unwrap();
+
+					if x > self.seek {
+						return Err(std::io::Error::new(
+							std::io::ErrorKind::InvalidInput,
+							"Seek past start",
+						));
+					}
+
+					self.seek -= x;
+				} else {
+					let x: u64 = x.try_into().unwrap();
+
+					if self.seek + x > self.length {
+						return Err(std::io::Error::new(
+							std::io::ErrorKind::InvalidInput,
+							"Seek past end",
+						));
+					}
+
+					self.seek += x;
+				}
+			}
+
+			SeekFrom::Start(x) => {
+				let x: u64 = x.try_into().unwrap();
+				if x > self.length {
+					return Err(std::io::Error::new(
+						std::io::ErrorKind::InvalidInput,
+						"Seek past end",
+					));
+				}
+
+				self.seek = x;
+			}
+
+			SeekFrom::End(x) => {
+				let x: u64 = x.try_into().unwrap();
+				if x > self.length {
+					return Err(std::io::Error::new(
+						std::io::ErrorKind::InvalidInput,
+						"Seek past start",
+					));
+				}
+				self.seek = self.length - x;
+			}
+		}
+
+		assert!(self.seek <= self.length);
+
+		return Ok(self.seek);
+	}
+}
+
+impl<'a, D: DiskDevice> Read for GPTPartition<'a, D> {
+	fn read(&mut self, buf: &mut [u8]) -> std::io::Result<usize> {
+		// Save parent cursor & seek
+		// (Not necessary for now, we don't need to save the parent cursor)
+		// let initial_pos = self.disk.device.stream_position()?;
+
+		self.disk.device.seek(SeekFrom::Start(
+			self.disk.start_offset + self.start_byte + self.seek,
+		))?;
+
+		// Make sure we stay within this partition
+		let from_back = self.length - self.seek;
+		let len: u64 = buf.len().try_into().unwrap();
+		let len = len.min(from_back);
+		let len: usize = len.try_into().unwrap();
+
+		// Do the read
+		let n = self.disk.device.read(&mut buf[0..len])?;
+
+		// Update cursor
+		let n_u64: u64 = n.try_into().unwrap();
+		self.seek += n_u64;
+		assert!(n_u64 <= from_back);
+		assert!(self.seek <= self.length);
+
+		// Fix parent cursor
+		// self.disk.device.seek(SeekFrom::Start(initial_pos))?;
+
+		return Ok(n);
+	}
+}
+
+impl<'a, D: DiskDevice> Write for GPTPartition<'a, D> {
+	fn flush(&mut self) -> std::io::Result<()> {
+		self.disk.device.flush()
+	}
+
+	fn write(&mut self, buf: &[u8]) -> std::io::Result<usize> {
+		// Save parent cursor & seek
+		// (Not necessary for now, we don't need to save the parent cursor)
+		// let initial_pos = self.disk.device.stream_position()?;
+
+		self.disk.device.seek(SeekFrom::Start(
+			self.disk.start_offset + self.start_byte + self.seek,
+		))?;
+
+		// Make sure we stay within this partition
+		let from_back = self.length - self.seek;
+		let len: u64 = buf.len().try_into().unwrap();
+		let len = len.min(from_back);
+		let len: usize = len.try_into().unwrap();
+
+		// Do the write
+		let n = self.disk.device.write(&buf[0..len])?;
+
+		// Update cursor
+		let n_u64: u64 = n.try_into().unwrap();
+		self.seek += n_u64;
+		assert!(n_u64 <= from_back);
+		assert!(self.seek <= self.length);
+
+		// Fix parent cursor
+		// self.disk.device.seek(SeekFrom::Start(initial_pos))?;
+
+		return Ok(n);
+	}
+}
+
+impl<'a, D: DiskDevice> GPTPartition<'a, D> {
+	/// The index of the first byte in this partition
+	pub fn start(&self) -> u64 {
+		self.start_byte
+	}
+
+	/// The length of this partition, in bytes
+	pub fn len(&self) -> u64 {
+		self.length
+	}
+}
+
+#[derive(Debug, Clone, Copy)]
+pub enum PartitionType {
+	BIOS,
+	EFI,
+	Linux,
+}
+
+impl FromStr for PartitionType {
+	type Err = String;
+	fn from_str(s: &str) -> Result<Self, Self::Err> {
+		Ok(match s {
+			"bios" => Self::BIOS,
+			"efi" => Self::EFI,
+			"linux" => Self::Linux,
+			_ => return Err("unknown partition type".into()),
+		})
+	}
+}
+
+impl From<&PartitionType> for partition_types::Type {
+	fn from(value: &PartitionType) -> Self {
+		match value {
+			PartitionType::BIOS => partition_types::BIOS,
+			PartitionType::EFI => partition_types::EFI,
+			PartitionType::Linux => partition_types::LINUX_FS,
+		}
+	}
+}

builder/src/main.rs

@@ -0,0 +1,49 @@
+use anstyle::{AnsiColor, Color, Style};
+use clap::Parser;
+
+mod cmd;
+mod gpt;
+mod util;
+
+fn get_styles() -> clap::builder::Styles {
+	clap::builder::Styles::styled()
+		.usage(
+			Style::new()
+				.bold()
+				.fg_color(Some(Color::Ansi(AnsiColor::BrightBlue))),
+		)
+		.header(
+			Style::new()
+				.bold()
+				.fg_color(Some(Color::Ansi(AnsiColor::Green))),
+		)
+		.literal(Style::new().fg_color(Some(Color::Ansi(AnsiColor::BrightBlack))))
+		.invalid(Style::new().fg_color(Some(Color::Ansi(AnsiColor::Red))))
+		.error(
+			Style::new()
+				.bold()
+				.fg_color(Some(Color::Ansi(AnsiColor::Red))),
+		)
+		.valid(
+			Style::new()
+				.bold()
+				.underline()
+				.fg_color(Some(Color::Ansi(AnsiColor::Green))),
+		)
+		.placeholder(Style::new().fg_color(Some(Color::Ansi(AnsiColor::White))))
+}
+
+/// Redox disk utility
+#[derive(Parser, Debug)]
+#[command(version, about, long_about = None, styles=get_styles())]
+struct Cli {
+	#[command(subcommand)]
+	command: cmd::Command,
+}
+
+/// Demonstrates how to create a new partition table without anything pre-existing
+fn main() {
+	let cli = Cli::parse();
+
+	cli.command.run();
+}

builder/src/util.rs

@@ -0,0 +1,45 @@
+// Parse a byte string like `5M` or `8 Tib` into a
+// quantity of bytes. Returns `None` if the input
+// could not be parsed.
+pub fn parse_bytes_postfix(string: &str) -> Option<u64> {
+	let mut lower = string.trim().to_lowercase();
+	// Turn Mb & Mib into M and Mi
+	if lower.ends_with("b") {
+		lower.pop();
+	}
+
+	let mut string = &lower[..];
+	let mut multiplier = 1;
+	let len = string.len();
+
+	if string.ends_with("k") {
+		string = &string[0..len - 1];
+		multiplier = 1000;
+	} else if lower.ends_with("m") {
+		string = &string[0..len - 1];
+		multiplier = 1000 * 1000;
+	} else if lower.ends_with("g") {
+		string = &string[0..len - 1];
+		multiplier = 1000 * 1000 * 1000;
+	} else if lower.ends_with("t") {
+		string = &string[0..len - 1];
+		multiplier = 1000 * 1000 * 1000 * 1000;
+	} else if lower.ends_with("ki") {
+		string = &string[0..len - 2];
+		multiplier = 1024;
+	} else if lower.ends_with("mi") {
+		string = &string[0..len - 2];
+		multiplier = 1024 * 1024;
+	} else if lower.ends_with("gi") {
+		string = &string[0..len - 2];
+		multiplier = 1024 * 1024 * 1024;
+	} else if lower.ends_with("ti") {
+		string = &string[0..len - 2];
+		multiplier = 1024 * 1024 * 1024 * 1024;
+	}
+
+	return match string.trim().parse::<u64>() {
+		Ok(x) => Some(multiplier * x),
+		Err(_) => None,
+	};
+}

make/bios

@@ -1,57 +0,0 @@
-# Build script for BIOS (legacy) boot.
-#
-# This compiles our bootloader as a static library,
-# and wraps it in a multistage loader.
-
-
-# Compile bootloader as library
-LIB_SRC = ./bootloader/Cargo.toml ./bootloader/Cargo.lock $(shell find ./bootloader/src -type f)
-$(BUILD_DIR)/bios.lib: $(LIB_SRC)
-	@mkdir -p $(BUILD_DIR)
-	env RUSTFLAGS="-C soft-float" \
-	cargo rustc \
-		--manifest-path="./bootloader/Cargo.toml" \
-		-Z build-std=core,alloc \
-		-Z build-std-features=compiler-builtins-mem \
-		--target "./bootloader/targets/x86-unknown-none.json" \
-		--lib \
-		--release \
-		-- \
-		--emit link="$(CURDIR)/$@"
-
-# Link bootloader
-BIOS_LD = ./bootloader/linkers/x86-unknown-none.ld
-$(BUILD_DIR)/bios.elf: $(BUILD_DIR)/bios.lib $(BIOS_LD)
-	ld \
-		-m elf_i386 \
-		--gc-sections \
-		-z max-page-size=0x1000 \
-		-T "$(BIOS_LD)" \
-		-o "$@" \
-		"$<"
-
-	objcopy --only-keep-debug "$@" "$@.sym"
-	objcopy --strip-debug "$@"
-
-# Wrap bootloader in three-stage BIOS loader
-BIOS_SRC = ./bios
-$(BUILD_DIR)/bios.bin: $(wildcard $(BIOS_SRC)/*.asm) $(BUILD_DIR)/bios.elf
-	@mkdir -p "$(BUILD_DIR)"
-	nasm \
-		-f bin \
-		-o "$@" \
-		-l "$@.lst" \
-		-D STAGE3="$(BUILD_DIR)/bios.elf" \
-		-i "$(BIOS_SRC)" \
-		"$(BIOS_SRC)/main.asm"
-
-# Build demo disk image
-$(BUILD_DIR)/bios.img: $(BUILD_DIR)/bios.bin $(BUILD_DIR)/filesystem.img
-	rm -f "$@.partial"
-	fallocate -l 256MiB "$@.partial"
-	parted -s -a minimal "$@.partial" mklabel msdos
-	parted -s -a minimal "$@.partial" mkpart primary 2MiB 100%
-	dd if="$<" of="$@.partial" bs=1 count=512 conv=notrunc
-	dd if="$<" of="$@.partial" bs=512 skip=1 seek=1 conv=notrunc
-	dd if="$(BUILD_DIR)/filesystem.img" of="$@.partial" bs=1MiB seek=2 conv=notrunc
-	mv "$@.partial" "$@"