memory map

nel_os_bootloader/run.sh

@@ -1,5 +1,11 @@
 #!/bin/sh
+
+cargo build --release --target x86_64-unknown-uefi
+
+cp target/x86_64-unknown-uefi/release/nel_os_bootloader.efi esp/efi/boot/bootx64.efi
+
 qemu-system-x86_64 -enable-kvm \
+	-m 4G \
     -drive if=pflash,format=raw,readonly=on,file=OVMF_CODE.fd \
     -drive if=pflash,format=raw,readonly=on,file=OVMF_VARS.fd \
     -drive format=raw,file=fat:rw:esp

nel_os_bootloader/src/main.rs

@@ -1,16 +1,34 @@
 #![no_main]
 #![no_std]
 
-use log::info;
-use uefi::prelude::*;
+use core::arch::asm;
+use uefi::{boot::MemoryType, mem::memory_map::MemoryMap, prelude::*, println};
+
+fn hlt_loop() -> ! {
+    loop {
+        unsafe {
+            asm!("hlt");
+        }
+    }
+}
 
 #[entry]
 fn main() -> Status {
     uefi::helpers::init().unwrap();
 
-    let boot_services = uefi::env::boot_services();
+    uefi::system::with_stdout(|stdout| stdout.clear()).unwrap();
 
-    info!("Hello world!");
-    boot::stall(10_000_000);
-    Status::SUCCESS
+    let memory_map = uefi::boot::memory_map(MemoryType::LOADER_DATA).unwrap();
+    println!("memory_map len: {}", memory_map.len());
+
+    println!("Conventional memory:");
+    for entry in memory_map.entries() {
+        if entry.ty != MemoryType::CONVENTIONAL {
+            continue;
+        }
+        println!("    Size: {:?}MiB", entry.page_count * 4 / 1024);
+        println!("    PhysStart: {:?}", entry.phys_start);
+    }
+
+    hlt_loop();
 }