made kernel the system entrypoint.

Cargo.lock

@@ -580,14 +580,18 @@ dependencies = [
 
 [[package]]
 name = "kernel"
-version = "0.1.2"
+version = "0.2.0"
 dependencies = [
  "crossbeam-queue",
+ "limine",
  "linked_list_allocator",
  "log",
  "slab",
  "spin 0.9.4",
+ "tracing",
+ "uart_16550",
  "versioning",
+ "x86_64",
 ]
 
 [[package]]

ableos/json_targets/x86_64-ableos.json

@@ -16,7 +16,7 @@
     "pre-link-args": {
         "ld.lld": [
             "--gc-sections",
-            "--script=ableos/src/arch/x86_64/kernel.ld"
+            "--script=kernel/lds/x86_64.ld"
         ]
     }
 }

kernel/.cargo/config.toml

@@ -1,2 +1,9 @@
+[unstable]
+build-std = ["core", "compiler_builtins", "alloc"]
+build-std-features = ["compiler-builtins-mem"]
+
 [build]
-target = "./json_targets/x86_64-ableos.json"
+target = "./targets/x86_64-ableos.json"
+
+[target.'cfg(target_arch = "x86_64")']
+rustflags = ["-C", "target-feature=+rdrand"]

kernel/Cargo.toml

@@ -1,18 +1,22 @@
 [package]
 edition = "2021"
 name = "kernel"
-version = "0.1.2"
+version = "0.2.0"
 
 [dependencies]
 linked_list_allocator = "0.9"
 log = "0.4.14"
 slab = { version = "0.4", default-features = false }
 spin = "0.9"
+versioning = { git = "https://git.ablecorp.us/able/aos_userland" }
+tracing = { version = "0.1.37", default-features = false, features = ["attributes"] }
 
 [dependencies.crossbeam-queue]
 version = "0.3"
 default-features = false
 features = ["alloc"]
 
-[dependencies.versioning]
+[target.'cfg(target_arch = "x86_64")'.dependencies]
-git = "https://git.ablecorp.us/able/aos_userland"
+limine = "0.1"
+uart_16550 = "0.2"
+x86_64 = "0.14"

kernel/lds/x86_64.ld

@@ -2,8 +2,7 @@
 OUTPUT_FORMAT(elf64-x86-64)
 OUTPUT_ARCH(i386:x86-64)
 
-/* We want the symbol `x86_64_start` to be our entry point */
+ENTRY(_kernel_start)
-ENTRY(x86_64_start)
 
 /* Define the program headers we want so the bootloader gives us the right */
 /* MMU permissions */

kernel/src/allocator.rs

@@ -1,6 +1,5 @@
 //! Memory allocator
 
-use linked_list_allocator::LockedHeap;
 use log::trace;
 
 ///
@@ -15,10 +14,6 @@ pub const HEAP_BASE: usize = 100;
 ///
 pub const HEAP_SIZE: usize = HEAP_BASE * HEAP_MULTIPLIER;
 
-/// Global allocator
-#[global_allocator]
-pub static ALLOCATOR: LockedHeap = LockedHeap::empty();
-
 #[alloc_error_handler]
 fn alloc_error_handler(layout: alloc::alloc::Layout) -> ! {
     trace!("allocation error: {:?}", layout);

kernel/src/arch/mod.rs

@@ -5,7 +5,7 @@ macro_rules! arch_cond {
         #[cfg(target_arch = $str)]
         pub mod $arch;
         #[cfg(target_arch = $str)]
-        pub use $arch::*;
+        pub use ::$arch::*;
     )*};
 }
 

kernel/src/arch/x86_64/allocator.rs

@@ -0,0 +1,48 @@
+use linked_list_allocator::LockedHeap;
+use x86_64::{
+    structures::paging::{
+        mapper::MapToError, FrameAllocator, Mapper, Page, PageTableFlags, Size4KiB,
+    },
+    VirtAddr,
+};
+
+use crate::allocator::{HEAP_SIZE, HEAP_START};
+
+#[global_allocator]
+static ALLOCATOR: LockedHeap = LockedHeap::empty();
+
+pub unsafe fn init_alloc() -> Result<(), MapToError<Size4KiB>> {
+    let page_range = {
+        let heap_start = VirtAddr::new(HEAP_START as u64);
+        let heap_end = heap_start + HEAP_SIZE - 1u64;
+        let heap_start_page = Page::containing_address(heap_start);
+        let heap_end_page = Page::containing_address(heap_end);
+        Page::range_inclusive(heap_start_page, heap_end_page)
+    };
+
+    let mut frame_allocator = super::memory::FRAME_ALLOC
+        .get()
+        .expect("frame allocator is not initialised")
+        .lock();
+
+    let mut mapper = super::memory::PAGE_TABLE
+        .get()
+        .expect("page table is not initialised")
+        .lock();
+
+    for page in page_range {
+        let frame = frame_allocator
+            .allocate_frame()
+            .ok_or(MapToError::FrameAllocationFailed)?;
+        let flags = PageTableFlags::PRESENT | PageTableFlags::WRITABLE;
+        mapper
+            .map_to(page, frame, flags, &mut *frame_allocator)?
+            .flush();
+    }
+
+    ALLOCATOR
+        .lock()
+        .init(crate::allocator::HEAP_START, crate::allocator::HEAP_SIZE);
+
+    Ok(())
+}

kernel/src/arch/x86_64/memory.rs

@@ -0,0 +1,64 @@
+use limine::{LimineMemmapEntry, LimineMemoryMapEntryType};
+use spin::{Mutex, Once};
+use x86_64::{
+    structures::paging::{FrameAllocator, FrameDeallocator, OffsetPageTable, PhysFrame, Size4KiB},
+    PhysAddr, VirtAddr,
+};
+
+pub static PAGE_TABLE: Once<Mutex<OffsetPageTable>> = Once::new();
+pub static FRAME_ALLOC: Once<Mutex<FrameAlloc>> = Once::new();
+
+/// Initialise page table
+pub unsafe fn init_pt(phys_base: VirtAddr) {
+    PAGE_TABLE.call_once(|| {
+        Mutex::new(OffsetPageTable::new(
+            &mut *((phys_base
+                + x86_64::registers::control::Cr3::read()
+                    .0
+                    .start_address()
+                    .as_u64())
+            .as_mut_ptr()),
+            phys_base,
+        ))
+    });
+}
+
+/// Initialise page frame allocator
+pub unsafe fn init_falloc(mmap: &'static [LimineMemmapEntry]) {
+    FRAME_ALLOC.call_once(|| Mutex::new(FrameAlloc::new(mmap)));
+}
+
+pub struct FrameAlloc {
+    mmap: &'static [LimineMemmapEntry],
+    next: usize,
+}
+
+impl FrameAlloc {
+    pub unsafe fn new(mmap: &'static [LimineMemmapEntry]) -> Self {
+        Self { mmap, next: 0 }
+    }
+
+    fn usable_frames(&self) -> impl Iterator<Item = PhysFrame> {
+        self.mmap
+            .iter()
+            .filter(|e| e.typ == LimineMemoryMapEntryType::Usable)
+            .map(|e| e.base..e.base + e.len)
+            .flat_map(|r| r.step_by(4096))
+            .map(PhysAddr::new)
+            .map(PhysFrame::containing_address)
+    }
+}
+
+unsafe impl FrameAllocator<Size4KiB> for FrameAlloc {
+    fn allocate_frame(&mut self) -> Option<PhysFrame<Size4KiB>> {
+        let f = self.usable_frames().nth(self.next);
+        self.next += 1;
+        f
+    }
+}
+
+impl FrameDeallocator<Size4KiB> for FrameAlloc {
+    unsafe fn deallocate_frame(&mut self, frame: PhysFrame<Size4KiB>) {
+        // TODO
+    }
+}

kernel/src/arch/x86_64/mod.rs

@@ -1 +1,39 @@
-//! 
+use limine::{LimineHhdmRequest, LimineMmapRequest};
+use x86_64::VirtAddr;
+
+mod allocator;
+mod memory;
+
+#[no_mangle]
+unsafe extern "C" fn _kernel_start() -> ! {
+    static HDHM_REQ: LimineHhdmRequest = LimineHhdmRequest::new(0);
+    static MMAP_REQ: LimineMmapRequest = LimineMmapRequest::new(0);
+
+    memory::init_pt(VirtAddr::new(
+        HDHM_REQ
+            .get_response()
+            .get()
+            .expect("tried to get physical memory mapping offset from Limine")
+            .offset,
+    ));
+
+    memory::init_falloc(
+        MMAP_REQ
+            .get_response()
+            .get()
+            .and_then(limine::LimineMemmapResponse::mmap)
+            .expect("tried to get memory map from Limine"),
+    );
+
+    allocator::init_alloc().expect("tried to initialise allocator");
+
+    unsafe {
+        use uart_16550::SerialPort;
+        use core::fmt::Write;
+        let mut sp = SerialPort::new(0x3F8);
+        sp.init();
+        sp.write_str("Hello from AbleOS x86_64 entrypoint!");
+    }
+
+    crate::kmain::kmain()
+}

kernel/src/kmain.rs

@@ -0,0 +1,5 @@
+//! AbleOS Kernel Entrypoint
+
+pub fn kmain() -> ! {
+    loop {}
+}

kernel/src/lib.rs

@@ -2,12 +2,12 @@
 
 #![feature(alloc_error_handler, prelude_import)]
 #![no_std]
-#![deny(missing_docs)]
 
 extern crate alloc;
 
 pub mod allocator;
 pub mod arch;
+pub mod kmain;
 pub mod task;
 
 use versioning::Version;
@@ -15,6 +15,11 @@ use versioning::Version;
 /// Kernel's version
 pub const KERNEL_VERSION: Version = Version {
     major: 0,
-    minor: 1,
+    minor: 2,
-    patch: 2,
+    patch: 0,
 };
+
+#[panic_handler]
+fn panic(info: &core::panic::PanicInfo) -> ! {
+    loop {}
+}

kernel/src/main.rs

@@ -0,0 +1,4 @@
+#![no_std]
+#![no_main]
+
+extern crate kernel;

kernel/targets/x86_64-ableos.json

@@ -0,0 +1,22 @@
+{
+    "llvm-target": "x86_64-unknown-none",
+    "data-layout": "e-m:e-i64:64-f80:128-n8:16:32:64-S128",
+    "arch": "x86_64",
+    "target-endian": "little",
+    "target-pointer-width": "64",
+    "target-c-int-width": "32",
+    "os": "none",
+    "executables": true,
+    "linker-flavor": "ld.lld",
+    "linker": "rust-lld",
+    "panic-strategy": "abort",
+    "disable-redzone": true,
+    "features": "-mmx,-sse,+soft-float",
+    "code-model": "kernel",
+    "pre-link-args": {
+        "ld.lld": [
+            "--gc-sections",
+            "--script=kernel/lds/x86_64.ld"
+        ]
+    }
+}

repbuild/src/main.rs

@@ -76,7 +76,7 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
                     // Build ableOS in release mode
                     Command::new("cargo")
                         .args(["build", "--release"])
-                        .current_dir(fs::canonicalize("./ableos").unwrap())
+                        .current_dir(fs::canonicalize("./kernel").unwrap())
                         .status()
                         .unwrap();
 
@@ -167,7 +167,7 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
 
                     // copy the kernel over to ./disk/boot/kernel
                     Command::new("cp")
-                        .arg("./target/x86_64-ableos/release/ableos")
+                        .arg("./target/x86_64-ableos/release/kernel")
                         .arg(&format!("{mountpoint}/boot/kernel"))
                         .status()?;
 
@@ -254,7 +254,7 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
                     // Build ableOS
                     Command::new("cargo")
                         .arg("build")
-                        .current_dir(fs::canonicalize("./ableos").unwrap())
+                        .current_dir(fs::canonicalize("./kernel").unwrap())
                         .status()
                         .unwrap();
 
@@ -294,7 +294,7 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
 
                     // copy the kernel over to ./disk/boot/kernel
                     Command::new("cp")
-                        .arg("./target/x86_64-ableos/debug/ableos")
+                        .arg("./target/x86_64-ableos/debug/kernel")
                         .arg(format!("{mountpoint}/boot/kernel"))
                         .status()
                         .unwrap();
@@ -333,7 +333,7 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
                     // Build ableOS
                     Command::new("cargo")
                         .args(["build", "--release"])
-                        .current_dir(fs::canonicalize("./ableos").unwrap())
+                        .current_dir(fs::canonicalize("./kernel").unwrap())
                         .status()
                         .unwrap();
 
@@ -372,7 +372,7 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
 
                     // copy the kernel over to ./disk/boot/kernel
                     Command::new("cp")
-                        .arg("./target/x86_64-ableos/release/ableos")
+                        .arg("./target/x86_64-ableos/release/kernel")
                         .arg(format!("{mountpoint}/boot/kernel"))
                         .status()
                         .unwrap();