x86_64: Refactor device info fetching

.gitignore

@@ -1 +1,2 @@
 target/
+/.idea

kernel/src/allocator.rs

@@ -341,5 +341,5 @@ unsafe impl Send for Heap {}
 fn alloc_error_handler(layout: alloc::alloc::Layout) -> ! {
     log::error!("allocation error: {:?}", layout);
     // Todo: Maybe panic here instead
-    crate::arch::sloop()
+    crate::arch::spin_loop()
 }

kernel/src/arch/x86_64/device_info_collector.rs

@@ -0,0 +1,67 @@
+use {
+    crate::{
+        arch::{pci, x86_64::cpuid},
+        device_tree::DeviceTree,
+        kmain::DEVICE_TREE,
+    },
+    limine::SmpRequest,
+    xml::XMLElement,
+};
+
+fn collect_cpu_info(device_tree: &mut DeviceTree) {
+    use crate::alloc::string::ToString;
+
+    static SMP: SmpRequest = SmpRequest::new(0);
+    let smp_response = SMP.get_response().get().unwrap();
+
+    let mut cpu = XMLElement::new("cpu");
+
+    // Get the amount of cores on the CPU
+    let core_count = smp_response.cpu_count.to_string();
+    cpu.set_attribute("core count", core_count);
+    for x in 0..smp_response.cpu_count {
+        let core_name = alloc::format!("core_{}", x);
+        let core = XMLElement::new(core_name);
+        cpu.set_child(core);
+    }
+
+    let cpu_info = cpuid::master().unwrap();
+
+    let brand_string = cpu_info.brand_string().unwrap_or("Unknown").to_string();
+    cpu.set_attribute("brand string", brand_string);
+
+    cpu.set_attribute("speed", "unknown");
+
+    // Get CPU features and add them to the device tree entry.
+    let mut cpu_features = XMLElement::new("CPU Features");
+    for (feature_key, feature_enabled) in cpu_info.features() {
+        cpu_features.set_attribute(feature_key, feature_enabled.to_string());
+    }
+    cpu.set_child(cpu_features);
+
+    // CPU temperature
+    if cpu_info.digital_temperature_sensor() {
+        let mut temperature_child = XMLElement::new("Temperature");
+
+        temperature_child.set_attribute("degrees", "Unknown");
+        cpu.set_child(temperature_child);
+    }
+
+    // Add CPU to device tree
+    let cpus = device_tree.devices.get_mut("CPUs").unwrap();
+    cpus.push(cpu);
+}
+
+pub fn collect_device_info() {
+    // Lock device tree
+    unsafe {
+        DEVICE_TREE.force_unlock();
+    }
+    let device_tree = &mut DEVICE_TREE.lock();
+
+    // Generate device tree from PCI enumeration.
+    pci::init(device_tree);
+
+    // Collect CPU info and add it to the device tree
+    collect_cpu_info(device_tree);
+}

kernel/src/arch/x86_64/mod.rs

@@ -1,8 +1,6 @@
-use {limine::SmpRequest, xml::XMLElement};
-
 use embedded_graphics::pixelcolor::Rgb888;
 
-use crate::{arch::x86_64::graphics::DISPLAY, bootmodules::BootModule, kmain::DEVICE_TREE};
+use crate::{arch::x86_64::graphics::DISPLAY, bootmodules::BootModule};
 
 pub mod memory;
 
@@ -13,6 +11,7 @@ pub(crate) mod interrupts;
 pub mod logging;
 pub mod pci;
 pub mod virtio;
+mod device_info_collector;
 
 pub use {logging::log, memory::PAGE_SIZE};
 
@@ -62,74 +61,7 @@ unsafe extern "C" fn _kernel_start() -> ! {
     static KFILE_REQ: KernelFileRequest = KernelFileRequest::new(0);
     static MOD_REQ: ModuleRequest = ModuleRequest::new(0);
 
-    static SMP: SmpRequest = SmpRequest::new(0);
-    let smp = SMP.get_response().get().unwrap();
-    use crate::alloc::string::ToString;
-
-    let cpuinfo = cpuid::master().unwrap();
-    let brand_string = cpuinfo.brand_string().unwrap_or("Unknown").to_string();
-    DEVICE_TREE.force_unlock();
-
-    pci::init();
-
-    let mut dt = DEVICE_TREE.lock();
-
-    let cpus = dt.devices.get_mut("CPUs").unwrap();
-    let mut cpu = XMLElement::new("cpu");
-    let core_count = smp.cpu_count.to_string();
-    cpu.set_attribute("core count", core_count);
-    for x in 0..smp.cpu_count {
-        let core_name = alloc::format!("core_{}", x);
-        let core = XMLElement::new(core_name);
-        cpu.set_child(core);
-    }
-
-    cpu.set_attribute("brand string", brand_string);
-
-    let _cpu_speed = 0;
-
-    cpu.set_attribute("speed", "unknown");
-
-    if false {
-        // disable()     // disable interrupts (if still not done)
-        let _i = 0;
-        let start = cpuinfo.time_stamp_counter();
-
-        log::info!("{:?}", start.unwrap().invariant_tsc());
-        for _x in 0..1000 {}
-        let _end = cpuinfo.time_stamp_counter();
-    }
-
-    let mut cpu_features = xml::XMLElement::new("CPU Features");
-    {
-        cpuinfo.version_information().unwrap();
-        let apic = cpuinfo.apic();
-        let avx = cpuinfo.avx();
-        let avx2 = cpuinfo.avx2();
-        let x2 = cpuinfo.x2apic();
-
-        let gb_pages = cpuinfo.gigabyte_pages();
-        let rdseed = cpuinfo.rdseed();
-        let rdrand = cpuinfo.rdrand();
-
-        cpu_features.set_attribute("apic", apic.to_string());
-        cpu_features.set_attribute("avx", avx.to_string());
-        cpu_features.set_attribute("avx2", avx2.to_string());
-        cpu_features.set_attribute("gigabyte pages", gb_pages.to_string());
-        cpu_features.set_attribute("rdrand", rdrand.to_string());
-        cpu_features.set_attribute("rdseed", rdseed.to_string());
-        cpu_features.set_attribute("x2apic", x2.to_string());
-    }
-    if cpuinfo.digital_temperature_sensor() {
-        let mut temperature_child = XMLElement::new("Temperature");
-
-        temperature_child.set_attribute("degrees", "Unknown");
-        cpu.set_child(temperature_child);
-    }
-
-    cpu.set_child(cpu_features);
-    cpus.push(cpu);
-    drop(dt);
+    device_info_collector::collect_device_info();
 
     // Graphics test
     {
@@ -244,7 +176,7 @@ unsafe extern "C" fn _kernel_start() -> ! {
 }
 
 /// Spin loop
-pub fn sloop() -> ! {
+pub fn spin_loop() -> ! {
     loop {
         x86_64::instructions::hlt();
     }

kernel/src/arch/x86_64/pci/mod.rs

@@ -9,10 +9,10 @@ pub struct PciDeviceInfo {
     pub rev_id: u8,
 }
 use crate::alloc::string::ToString;
+
 /// Enumerate PCI devices and run initialisation routines on ones we support
-pub fn init() {
-    let mut dt = DEVICE_TREE.lock();
-    dt.devices
+pub fn init(device_tree: &mut DeviceTree) {
+    device_tree.devices
         .insert("Unidentified PCI".to_string(), alloc::vec![]);
     let mut devices = alloc::vec![];
 
@@ -52,7 +52,7 @@ pub fn init() {
         }
     }
     for (dev_type, dev) in devices {
-        if let Some(abc) = dt.devices.get_mut(dev_type) {
+        if let Some(abc) = device_tree.devices.get_mut(dev_type) {
             abc.push(dev);
         }
     }
@@ -248,7 +248,7 @@ impl Into<u16> for Vendor {
     }
 }
 
-impl core::fmt::Display for Vendor {
+impl Display for Vendor {
     fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
         use Vendor::*;
 
@@ -269,9 +269,8 @@ impl core::fmt::Display for Vendor {
 
 use core::fmt::Display;
 
-use crate::kmain::DEVICE_TREE;
-
 use x86_64::instructions::port::Port;
+use crate::device_tree::DeviceTree;
 
 #[allow(non_camel_case_types, dead_code)]
 #[derive(Debug, Clone, Copy, PartialEq)]

kernel/src/device_tree.rs

@@ -11,7 +11,7 @@ use {
 pub type Device = xml::XMLElement;
 
 /// A tree of devices
-// TODO: alphabatize this list
+// TODO: alphabetize this list
 #[derive(Debug)]
 pub struct DeviceTree {
     /// The device tree

kernel/src/scheduler.rs

@@ -43,8 +43,8 @@ impl Scheduler<'_> {
         loop {
             // If there are no programs to run then sleep.
             if self.data.is_empty() {
-                use crate::arch::sloop;
-                sloop();
+                use crate::arch::spin_loop;
+                spin_loop();
             }
 
             let mut prog = self.data.pop_front().unwrap();