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Adding MBR partitioning and using it to create a boot image #298

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merged 1 commit into from
May 7, 2021
Merged

Adding MBR partitioning and using it to create a boot image #298

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3 changes: 0 additions & 3 deletions .gitmodules
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Original file line number Diff line number Diff line change
@@ -1,6 +1,3 @@
[submodule "limine"]
path = limine
url = https://github.com/limine-bootloader/limine.git
[submodule "echfs"]
path = echfs
url = https://github.com/echfs/echfs.git
315 changes: 251 additions & 64 deletions build.zig
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1 change: 0 additions & 1 deletion echfs
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Submodule echfs deleted from 14da98
42 changes: 9 additions & 33 deletions makeiso_64.sh
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Original file line number Diff line number Diff line change
@@ -1,20 +1,16 @@
#!/usr/bin/env bash

which readelf > /dev/null || exit_missing
MAP_FILE=$1
PLUTO_ELF=$2
OUTPUT_FILE=$3
RAMDISK=$4

INSTALL_PATH=$1
BIN_PATH=$2
PLUTO_ELF=$3
OUTPUT_FILE=$4
RAMDISK=$5
exit_missing() {
printf "$_ must be installed\n";
exit 1;
}

if [[ ! -f ./echfs/echfs-utils ]]
then
echo "Building echfs-utils"
cd echfs
make echfs-utils
cd ..
fi
which readelf > /dev/null || exit_missing

if [[ ! -f ./limine/limine-install ]]
then
Expand All @@ -24,26 +20,6 @@ then
cd ..
fi

MAP_FILE=$INSTALL_PATH/"kernel.map"

# Read the symbols from the binary, remove all the unnecessary columns with awk and emit to a map file
readelf -s --wide $PLUTO_ELF | grep -F "FUNC" | awk '{$1=$3=$4=$5=$6=$7=""; print $0}' | sort -k 1 > $MAP_FILE
echo "" >> $MAP_FILE

if [[ -f $OUTPUT_FILE ]]
then
rm $OUTPUT_FILE
fi

mkdir -p $BIN_PATH

dd if=/dev/zero bs=1M count=0 seek=64 of=$OUTPUT_FILE
parted -s $OUTPUT_FILE mklabel msdos
parted -s $OUTPUT_FILE mkpart primary 1 100%
./echfs/echfs-utils -m -p0 $OUTPUT_FILE quick-format 32768
./echfs/echfs-utils -m -p0 $OUTPUT_FILE import limine.cfg limine.cfg
./echfs/echfs-utils -m -p0 $OUTPUT_FILE import limine/limine.sys limine.sys
./echfs/echfs-utils -m -p0 $OUTPUT_FILE import $PLUTO_ELF pluto.elf
./echfs/echfs-utils -m -p0 $OUTPUT_FILE import $RAMDISK initrd.ramdisk
./echfs/echfs-utils -m -p0 $OUTPUT_FILE import $MAP_FILE kernel.map
./limine/limine-install $OUTPUT_FILE
2 changes: 1 addition & 1 deletion src/kernel/arch/x86/64bit/boot.zig
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Original file line number Diff line number Diff line change
Expand Up @@ -6,7 +6,7 @@ const arch = @import("arch.zig");
const Header = packed struct {
/// The kernel entry point or 0 for entry point of Elf file.
entry_point: u64,
/// THe stack address.
/// The stack address.
stack: *u8,
/// Unused flags
flags: u64,
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91 changes: 86 additions & 5 deletions src/kernel/arch/x86/common/arch.zig
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Original file line number Diff line number Diff line change
@@ -1,9 +1,5 @@
const builtin = @import("builtin");
const gdt = switch (builtin.arch) {
.i386 => @import("../32bit/gdt.zig"),
.x86_64 => @import("../64bit/gdt.zig"),
else => unreachable,
};
const gdt = @import("gdt.zig");
const idt = switch (builtin.arch) {
.i386 => @import("../32bit/idt.zig"),
.x86_64 => @import("../64bit/idt.zig"),
Expand All @@ -21,6 +17,91 @@ const BootPayload = switch (builtin.arch) {
else => unreachable,
};

// This is the assembly for the FAT bootloader.
// [bits 16]
// [org 0x7C00]
//
// jmp short _start
// nop
//
// times 87 db 0xAA
//
// _start:
// jmp long 0x0000:start_16bit
//
// start_16bit:
// cli
// mov ax, cs
// mov ds, ax
// mov es, ax
// mov ss, ax
// mov sp, 0x7C00
// lea si, [message]
// .print_string_with_new_line:
// mov ah, 0x0E
// xor bx, bx
// .print_string_loop:
// lodsb
// cmp al, 0
// je .print_string_done
// int 0x10
// jmp short .print_string_loop
// .print_string_done:
// mov al, 0x0A
// int 0x10
// mov al, 0x0D
// int 0x10
//
// .reboot:
// xor ah, ah
// int 0x16
// int 0x19
//
// .loop_forever:
// hlt
// jmp .loop_forever
// message db "This is not a bootable disk. Please insert a bootable floppy and press any key to try again", 0
// times 510 - ($ - $$) db 0
// dw 0xAA55

/// Basic boot code that will just print to the scream to insert a bootable image. This is intended
/// as a place holder to be over written with real boot code if needed.
/// This assumes the 512 sector size and includes the 0xAA55 boot signature.
pub const filesystem_bootsector_boot_code = [512]u8{
0xEB, 0x58, 0x90, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x66, 0xEA, 0x62, 0x7C, 0x00, 0x00,
0x00, 0x00, 0xFA, 0x8C, 0xC8, 0x8E, 0xD8, 0x8E, 0xC0, 0x8E, 0xD0, 0xBC, 0x00, 0x7C, 0x8D, 0x36,
0x8F, 0x7C, 0xB4, 0x0E, 0x31, 0xDB, 0xAC, 0x3C, 0x00, 0x74, 0x04, 0xCD, 0x10, 0xEB, 0xF7, 0xB0,
0x0A, 0xCD, 0x10, 0xB0, 0x0D, 0xCD, 0x10, 0x30, 0xE4, 0xCD, 0x16, 0xCD, 0x19, 0xEB, 0xFE, 0x54,
0x68, 0x69, 0x73, 0x20, 0x69, 0x73, 0x20, 0x6E, 0x6F, 0x74, 0x20, 0x61, 0x20, 0x62, 0x6F, 0x6F,
0x74, 0x61, 0x62, 0x6C, 0x65, 0x20, 0x64, 0x69, 0x73, 0x6B, 0x2E, 0x20, 0x50, 0x6C, 0x65, 0x61,
0x73, 0x65, 0x20, 0x69, 0x6E, 0x73, 0x65, 0x72, 0x74, 0x20, 0x61, 0x20, 0x62, 0x6F, 0x6F, 0x74,
0x61, 0x62, 0x6C, 0x65, 0x20, 0x66, 0x6C, 0x6F, 0x70, 0x70, 0x79, 0x20, 0x61, 0x6E, 0x64, 0x20,
0x70, 0x72, 0x65, 0x73, 0x73, 0x20, 0x61, 0x6E, 0x79, 0x20, 0x6B, 0x65, 0x79, 0x20, 0x74, 0x6F,
0x20, 0x74, 0x72, 0x79, 0x20, 0x61, 0x67, 0x61, 0x69, 0x6E, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x55, 0xAA,
};

///
/// Assembly that reads data from a given port and returns its value.
///
Expand Down
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