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#![no_std]
#![no_main]
#![allow(static_mut_refs, unsafe_code, dead_code, unused_doc_comments)]
// SAFETY: single-core kernel, no preemption — static mut access is sound
// Toy kernel: dead code and unused items during active development
extern crate alloc;
mod font;
mod gop;
mod interrupts;
mod memory;
mod ps2;
mod serial;
mod shell;
mod uefi;
use core::panic::PanicInfo;
use uefi::*;
// ---------------------------------------------------------------------------
// Panic handler
// ---------------------------------------------------------------------------
#[panic_handler]
fn panic(info: &PanicInfo) -> ! {
use core::fmt::Write;
serial::write_str("\r\n*** PANIC ***\r\n");
let _ = write!(&mut serial::SerialWriter, "{}\r\n", info.message());
if let Some(loc) = info.location() {
let _ = write!(
&mut serial::SerialWriter,
" at {}:{}\r\n",
loc.file(),
loc.line()
);
}
loop {
unsafe {
core::arch::asm!("cli; hlt");
}
}
}
// ---------------------------------------------------------------------------
// EFI entry point
// ---------------------------------------------------------------------------
#[no_mangle]
pub extern "efiapi" fn efi_main(image_handle: Handle, system_table: *mut SystemTable) -> ! {
let st = unsafe { &mut *system_table };
let bs = unsafe { &mut *st.boot_services };
let con_out = unsafe { &mut *st.con_out };
// ---- Phase 1: UEFI boot services alive ----
// Print banner via UEFI console
unsafe {
let banner: [u16; 28] = [
'r' as u16, 'a' as u16, 'i' as u16, 's' as u16, 'e' as u16, 'r' as u16, 'n' as u16,
'i' as u16, 'c' as u16, 's' as u16, ' ' as u16, 'v' as u16, '0' as u16, '.' as u16,
'1' as u16, ' ' as u16, '-' as u16, ' ' as u16, 'b' as u16, 'o' as u16, 'o' as u16,
't' as u16, 'i' as u16, 'n' as u16, 'g' as u16, '.' as u16, '.' as u16, 0x0A,
];
(con_out.output_string)(con_out, banner.as_ptr());
}
// Init serial early so we can debug-print before EBS
serial::init();
serial_println!("=== raisernics boot ===");
// Stash the memory map
let map_key = memory::capture_memory_map(bs);
let map_key = match map_key {
Ok(k) => k,
Err(e) => {
serial_println!("mem: capture_memory_map failed 0x{:x}", e);
0
}
};
// Locate GOP (Graphics Output Protocol)
let mut gop_interface: *mut core::ffi::c_void = core::ptr::null_mut();
let gop_guid = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID;
let gop_result = unsafe {
(bs.locate_protocol)(
&gop_guid as *const Guid,
core::ptr::null_mut(),
&mut gop_interface,
)
};
if gop_result == EFI_SUCCESS {
let gop = unsafe { &mut *(gop_interface as *mut GraphicsOutputProtocol) };
serial_println!("gop: framebuffer found");
gop::init(gop);
} else {
serial_println!("gop: not found (0x{:x})", gop_result);
}
// ExitBootServices — we now own the machine
let ebs_result = unsafe { (bs.exit_boot_services)(image_handle, map_key) };
if ebs_result != EFI_SUCCESS {
// Memory map may have changed; try again with fresh map
// (This is the standard UEFI EBS retry dance.)
serial_println!(
"WARN: ExitBootServices failed (0x{:x}), retrying...",
ebs_result
);
let _map_key = match memory::refresh_and_exit(bs, image_handle) {
Ok(k) => k,
Err(e) => {
serial_println!("FATAL: cannot ExitBootServices (0x{:x})", e);
loop {
unsafe {
core::arch::asm!("cli; hlt");
}
}
}
};
}
// ---- Phase 2: Native mode ----
serial::init();
serial_println!("serial: COM1 115200 8N1");
// PS/2 keyboard
ps2::init();
serial_println!("ps2: keyboard initialized");
// Interrupts — IDT, PIC, PIT timer, keyboard IRQ handler
interrupts::init();
serial_println!("intr: IDT loaded, PIC remapped, timer ~100 Hz");
// Memory: the bump allocator was set up during capture_memory_map.
// `alloc::Vec`, `alloc::String`, `format!` etc. are now usable.
// Print memory summary
dump_memory_summary();
serial_println!("boot: entering shell");
shell::run();
}
// ---------------------------------------------------------------------------
// Print a memory summary from the stashed memory map
// ---------------------------------------------------------------------------
fn dump_memory_summary() {
let (map, key) = memory::get_map();
let mut conventional_4k = 0u64;
let mut addr_space_4k = 0u64;
for desc in map.iter() {
let pages = desc.number_of_pages;
addr_space_4k += pages;
if desc.kind == 7 {
conventional_4k += pages;
}
}
serial_println!(
"mem: {} entries, key=0x{:x}, usable: {} KB ({} MB)",
map.len(),
key,
conventional_4k * 4,
(conventional_4k * 4) / 1024,
);
serial_println!(
"mem: address space: {} MB (incl. PCIe MMIO)",
(addr_space_4k * 4) / 1024,
);
}
// ---------------------------------------------------------------------------
// Helper: write a panic-proof string via UEFI console (used before serial)
// ---------------------------------------------------------------------------
#[allow(dead_code)]
unsafe fn uefi_puts(con_out: *mut SimpleTextOutput, s: &str) {
// Simple ASCII → UEFI-CHAR16 conversion (stack buffer, panic-safe)
let mut buf: [u16; 128] = [0; 128];
let len = s.len().min(127);
for (i, &b) in s.as_bytes()[..len].iter().enumerate() {
buf[i] = b as u16;
}
buf[len] = 0x0A; // LF
let out = unsafe { &mut *con_out };
(out.output_string)(out, buf.as_ptr());
}
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