commit b6b4854f715beed7bdac4f37fb4735435d2a3dd3
Author: Mathieu Strypsteen <mathieu@strypsteen.me>
Date:   Sat Jun 29 20:50:08 2024 +0200

    Initial commit

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..887f18b
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+img
+target
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..b3dbff0
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,22 @@
+This is free and unencumbered software released into the public domain.
+
+Anyone is free to copy, modify, publish, use, compile, sell, or
+distribute this software, either in source code form or as a compiled
+binary, for any purpose, commercial or non-commercial, and by any
+means.
+
+In jurisdictions that recognize copyright laws, the author or authors
+of this software dedicate any and all copyright interest in the
+software to the public domain. We make this dedication for the benefit
+of the public at large and to the detriment of our heirs and
+successors. We intend this dedication to be an overt act of
+relinquishment in perpetuity of all present and future rights to this
+software under copyright law.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.
diff --git a/build.sh b/build.sh
new file mode 100755
index 0000000..e1f329d
--- /dev/null
+++ b/build.sh
@@ -0,0 +1,16 @@
+#!/bin/sh
+set -e
+rm -rf img
+mkdir -p img/boot/efi/boot
+cd kernel && cargo build --release && cd ..
+cd loader && cargo build --release && cd ..
+cp loader/target/x86_64-unknown-uefi/release/loader.efi img/boot/efi/boot/bootx64.efi
+cd img
+dd if=/dev/zero of=boot.img bs=1M count=16 status=none
+mformat -i boot.img
+mcopy -si boot.img boot/* ::
+dd if=/dev/zero of=os.img bs=1M count=32 status=none
+parted -s os.img mklabel gpt
+parted -s os.img mkpart primary fat32 2048s 100%
+parted -s os.img set 1 esp on
+dd if=boot.img of=os.img bs=1M seek=1 conv=notrunc status=none
diff --git a/kernel/.cargo/config.toml b/kernel/.cargo/config.toml
new file mode 100644
index 0000000..98ee5ed
--- /dev/null
+++ b/kernel/.cargo/config.toml
@@ -0,0 +1,3 @@
+[build]
+target = "x86_64-unknown-none"
+rustflags = ["-C", "link-arg=link.ld"]
diff --git a/kernel/Cargo.lock b/kernel/Cargo.lock
new file mode 100644
index 0000000..97c0833
--- /dev/null
+++ b/kernel/Cargo.lock
@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "kernel"
+version = "0.0.1"
diff --git a/kernel/Cargo.toml b/kernel/Cargo.toml
new file mode 100644
index 0000000..831a26b
--- /dev/null
+++ b/kernel/Cargo.toml
@@ -0,0 +1,6 @@
+[package]
+name = "kernel"
+version = "0.0.1"
+edition = "2021"
+
+[dependencies]
diff --git a/kernel/link.ld b/kernel/link.ld
new file mode 100644
index 0000000..7cb4add
--- /dev/null
+++ b/kernel/link.ld
@@ -0,0 +1,15 @@
+SECTIONS {
+  . = 0xffffffff80000000;
+  .text ALIGN(0x1000) : {
+    *(.text*)
+  }
+  .rodata ALIGN(0x1000) : {
+    *(.rodata*)
+  }
+  .data ALIGN(0x1000) : {
+    *(.data*)
+  }
+  .bss ALIGN(0x1000) : {
+    *(.bss*)
+  }
+}
diff --git a/kernel/src/main.rs b/kernel/src/main.rs
new file mode 100644
index 0000000..3289e15
--- /dev/null
+++ b/kernel/src/main.rs
@@ -0,0 +1,14 @@
+#![no_std]
+#![no_main]
+
+use core::panic::PanicInfo;
+
+#[no_mangle]
+fn _start() {
+    loop {}
+}
+
+#[panic_handler]
+fn panic(_info: &PanicInfo) -> ! {
+    loop {}
+}
diff --git a/loader/.cargo/config.toml b/loader/.cargo/config.toml
new file mode 100644
index 0000000..85d49dc
--- /dev/null
+++ b/loader/.cargo/config.toml
@@ -0,0 +1,2 @@
+[build]
+target = "x86_64-unknown-uefi"
diff --git a/loader/Cargo.lock b/loader/Cargo.lock
new file mode 100644
index 0000000..dab2e87
--- /dev/null
+++ b/loader/Cargo.lock
@@ -0,0 +1,186 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
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+[[package]]
+name = "loader"
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+ "elf",
+ "log",
+ "uefi",
+ "x86_64",
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diff --git a/loader/Cargo.toml b/loader/Cargo.toml
new file mode 100644
index 0000000..fa617ea
--- /dev/null
+++ b/loader/Cargo.toml
@@ -0,0 +1,10 @@
+[package]
+name = "loader"
+version = "0.0.1"
+edition = "2021"
+
+[dependencies]
+elf = {version = "0.7.4", default-features = false}
+log = "0.4.21"
+uefi = {version = "0.28.0", features = ["logger", "panic_handler"]}
+x86_64 = {version = "0.15.1", default-features = false}
diff --git a/loader/src/elf.rs b/loader/src/elf.rs
new file mode 100644
index 0000000..c608257
--- /dev/null
+++ b/loader/src/elf.rs
@@ -0,0 +1,40 @@
+use core::ptr;
+
+use elf::{abi::PT_LOAD, endian::LittleEndian, ElfBytes};
+use uefi::table::{
+    boot::{AllocateType, MemoryType},
+    Boot, SystemTable,
+};
+
+const KERNEL_VIRT_START: u64 = 0xffffffff80000000;
+
+pub fn load_kernel(kernel: &[u8], system_table: &SystemTable<Boot>) {
+    let file: ElfBytes<LittleEndian> = ElfBytes::minimal_parse(kernel).unwrap();
+    let mut kernel_size = 0;
+    for i in file.segments().unwrap() {
+        if i.p_type != PT_LOAD {
+            continue;
+        }
+        if i.p_vaddr < KERNEL_VIRT_START {
+            panic!("Invalid kernel segments")
+        }
+        let end_addr = i.p_vaddr - KERNEL_VIRT_START + i.p_memsz;
+        if end_addr > kernel_size {
+            kernel_size = end_addr;
+        }
+    }
+    let phys_start = system_table
+        .boot_services()
+        .allocate_pages(AllocateType::AnyPages, MemoryType::LOADER_DATA, ((kernel_size + 0xfff) / 0x1000).try_into().unwrap())
+        .unwrap();
+    for i in file.segments().unwrap() {
+        if i.p_type != PT_LOAD {
+            continue;
+        }
+        let start_addr = i.p_vaddr - KERNEL_VIRT_START + phys_start;
+        unsafe {
+            ptr::write_bytes(start_addr as *mut u8, 0, i.p_memsz.try_into().unwrap());
+            ptr::copy(kernel[i.p_offset.try_into().unwrap()..].as_ptr(), start_addr as *mut u8, i.p_filesz.try_into().unwrap());
+        }
+    }
+}
diff --git a/loader/src/main.rs b/loader/src/main.rs
new file mode 100644
index 0000000..abf6e84
--- /dev/null
+++ b/loader/src/main.rs
@@ -0,0 +1,23 @@
+#![no_main]
+#![no_std]
+
+use elf::load_kernel;
+use log::debug;
+use uefi::{
+    entry,
+    table::{boot::MemoryType, Boot, SystemTable},
+    Handle, Status,
+};
+
+mod elf;
+
+const KERNEL: &[u8] = include_bytes!("../../kernel/target/x86_64-unknown-none/release/kernel");
+
+#[entry]
+fn main(image_handle: Handle, mut system_table: SystemTable<Boot>) -> Status {
+    uefi::helpers::init(&mut system_table).unwrap();
+    debug!("Starting bootloader...");
+    load_kernel(KERNEL, &system_table);
+    let _memory_map = system_table.exit_boot_services(MemoryType::LOADER_DATA).1;
+    loop {}
+}
diff --git a/rust-toolchain.toml b/rust-toolchain.toml
new file mode 100644
index 0000000..860058f
--- /dev/null
+++ b/rust-toolchain.toml
@@ -0,0 +1,2 @@
+[toolchain]
+targets = ["x86_64-unknown-none", "x86_64-unknown-uefi"]
diff --git a/rustfmt.toml b/rustfmt.toml
new file mode 100644
index 0000000..ffc467d
--- /dev/null
+++ b/rustfmt.toml
@@ -0,0 +1 @@
+max_width = 200