Start work on the cache info module

.idea/DendrobatesTinctoriusAzureus.iml

@@ -18,6 +18,11 @@
       <sourceFolder url="file://$MODULE_DIR$/polling_serial/examples" isTestSource="false" />
       <sourceFolder url="file://$MODULE_DIR$/polling_serial/tests" isTestSource="true" />
       <sourceFolder url="file://$MODULE_DIR$/polling_serial/benches" isTestSource="true" />
+      <sourceFolder url="file://$MODULE_DIR$/cache_info/src" isTestSource="false" />
+      <sourceFolder url="file://$MODULE_DIR$/cache_info/examples" isTestSource="false" />
+      <sourceFolder url="file://$MODULE_DIR$/cache_info/tests" isTestSource="true" />
+      <sourceFolder url="file://$MODULE_DIR$/cache_info/benches" isTestSource="true" />
+      <excludeFolder url="file://$MODULE_DIR$/cache_info/target" />
       <excludeFolder url="file://$MODULE_DIR$/kernel/target" />
       <excludeFolder url="file://$MODULE_DIR$/polling_serial/target" />
       <excludeFolder url="file://$MODULE_DIR$/target" />

Cargo.lock

@@ -31,6 +31,13 @@ dependencies = [
  "bit_field 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "cache_info"
+version = "0.1.0"
+dependencies = [
+ "polling_serial 0.1.0",
+]
+
 [[package]]
 name = "cast"
 version = "0.2.2"
@@ -41,6 +48,7 @@ name = "dendrobates_tinctoreus_azureus"
 version = "0.1.0"
 dependencies = [
  "bootloader 0.8.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cache_info 0.1.0",
  "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "linked_list_allocator 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "polling_serial 0.1.0",

Cargo.toml

@@ -3,6 +3,7 @@
 members = [
     "vga_buffer",
     "polling_serial",
+    "cache_info",
 ]
 
 [package]
@@ -28,6 +29,7 @@ vga_buffer = { path = "vga_buffer" }
 polling_serial = { path = "polling_serial" }
 volatile = "0.2.6"
 linked_list_allocator = "0.6.4"
+cache_info = { path = "cache_info" }
 
 [dependencies.lazy_static]
 version = "1.0"

cache_info/Cargo.toml

@@ -0,0 +1,10 @@
+[package]
+name = "cache_info"
+version = "0.1.0"
+authors = ["guillaume didier <guillaume.didier@inria.fr>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+polling_serial = { path = "../polling_serial" }

cache_info/src/lib.rs

@@ -0,0 +1,42 @@
+#![no_std]
+
+/// Stuff to do in here :
+/// This module is meant to compute and return info about the caching structure
+/// Should include if needed the work for reverse engineering L3 complex addressing
+/// May also have a module to deal with prefetchers
+extern crate alloc;
+
+use alloc::boxed::Box;
+use core::arch::x86_64 as arch_x86;
+use polling_serial::serial_println;
+
+pub fn test() {
+    let x = Box::new(41);
+    let cr = unsafe { arch_x86::__cpuid_count(0x04, 0) };
+    serial_println!("{:?}", cr);
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum CacheType {
+    Null = 0,
+    Data = 1,
+    Instruction = 2,
+    Unified = 3,
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub struct CacheInfo {
+    cache_type: CacheType,
+    level: u8,
+    self_init: bool,
+    fully_assoc: bool,
+    core_for_cache: u16,
+    core_in_package: u16,
+    cache_line_size: u16,
+    physical_line_partition: u16,
+    associativity: u16,
+    sets: u32,
+    wbinvd_no_guarantee: bool,
+    inclusive: bool,
+    complex_cache_indexing: bool,
+}

src/main.rs

@@ -10,6 +10,7 @@ extern crate alloc;
 
 use alloc::boxed::Box;
 use bootloader::{entry_point, BootInfo};
+use cache_info;
 use core::panic::PanicInfo;
 use dendrobates_tinctoreus_azureus::allocator;
 use polling_serial::serial_print;
@@ -84,6 +85,8 @@ fn kernel_main(boot_info: &'static BootInfo) -> ! {
 
     let x = Box::new(41);
 
+    cache_info::test();
+
     serial_print!("Input a character: ");
 
     let c = { polling_serial::SERIAL1.lock().read() };