Arch context in kernel context

arch/x86_64/src/context.rs

@@ -1,26 +1,36 @@
+#[derive(Debug)]
 pub struct Context {
-    flags: usize,
-    bx: usize,
+    /// RFLAGS register
+    rflags: usize,
+    /// RBX register
+    rbx: usize,
+    /// R12 register
     r12: usize,
+    /// R13 register
     r13: usize,
+    /// R14 register
     r14: usize,
+    /// R15 register
     r15: usize,
-    bp: usize,
-    sp: usize,
+    /// Base pointer
+    rbp: usize,
+    /// Stack pointer
+    rsp: usize,
+    /// Page table pointer
     cr3: usize
 }
 
 impl Context {
     pub fn new() -> Context {
         Context {
-            flags: 0,
-            bx: 0,
+            rflags: 0,
+            rbx: 0,
             r12: 0,
             r13: 0,
             r14: 0,
             r15: 0,
-            bp: 0,
-            sp: 0,
+            rbp: 0,
+            rsp: 0,
             cr3: 0
         }
     }
@@ -40,11 +50,11 @@ impl Context {
         }
 */
 
-        asm!("pushfq ; pop $0" : "=r"(self.flags) : : "memory" : "intel", "volatile");
-        asm!("push $0 ; popfq" : : "r"(next.flags) : "memory" : "intel", "volatile");
+        asm!("pushfq ; pop $0" : "=r"(self.rflags) : : "memory" : "intel", "volatile");
+        asm!("push $0 ; popfq" : : "r"(next.rflags) : "memory" : "intel", "volatile");
 
-        asm!("mov $0, rbx" : "=r"(self.bx) : : "memory" : "intel", "volatile");
-        asm!("mov rbx, $0" : : "r"(next.bx) : "memory" : "intel", "volatile");
+        asm!("mov $0, rbx" : "=r"(self.rbx) : : "memory" : "intel", "volatile");
+        asm!("mov rbx, $0" : : "r"(next.rbx) : "memory" : "intel", "volatile");
 
         asm!("mov $0, r12" : "=r"(self.r12) : : "memory" : "intel", "volatile");
         asm!("mov r12, $0" : : "r"(next.r12) : "memory" : "intel", "volatile");
@@ -58,11 +68,11 @@ impl Context {
         asm!("mov $0, r15" : "=r"(self.r15) : : "memory" : "intel", "volatile");
         asm!("mov r15, $0" : : "r"(next.r15) : "memory" : "intel", "volatile");
 
-        asm!("mov $0, rbp" : "=r"(self.bp) : : "memory" : "intel", "volatile");
-        asm!("mov rbp, $0" : : "r"(next.bp) : "memory" : "intel", "volatile");
+        asm!("mov $0, rbp" : "=r"(self.rbp) : : "memory" : "intel", "volatile");
+        asm!("mov rbp, $0" : : "r"(next.rbp) : "memory" : "intel", "volatile");
 
-        asm!("mov $0, rsp" : "=r"(self.sp) : : "memory" : "intel", "volatile");
-        asm!("mov rsp, $0" : : "r"(next.sp) : "memory" : "intel", "volatile");
+        asm!("mov $0, rsp" : "=r"(self.rsp) : : "memory" : "intel", "volatile");
+        asm!("mov rsp, $0" : : "r"(next.rsp) : "memory" : "intel", "volatile");
 
         /* TODO
         asm!("mov $0, cr3" : "=r"(self.cr3) : : "memory" : "intel", "volatile");

kernel/context/mod.rs

@@ -4,6 +4,7 @@ use collections::{BTreeMap, Vec};
 use core::sync::atomic::{AtomicUsize, ATOMIC_USIZE_INIT, Ordering};
 use spin::{Once, RwLock, RwLockReadGuard, RwLockWriteGuard};
 
+use arch::context::Context as ArchContext;
 use syscall::{Error, Result};
 
 /// File operations
@@ -55,6 +56,15 @@ impl ContextList {
         assert!(self.map.insert(id, RwLock::new(Context::new(id))).is_none());
         Ok(self.map.get(&id).expect("failed to insert new context"))
     }
+
+    pub fn spawn(&mut self, func: extern fn()) -> Result<&RwLock<Context>> {
+        let context_lock = self.new_context()?;
+        {
+            let mut context = context_lock.write();
+            print!("{}", format!("{}: {:X}\n", context.id, func as usize));
+        }
+        Ok(context_lock)
+    }
 }
 
 /// Contexts list
@@ -85,19 +95,31 @@ pub fn contexts_mut() -> RwLockWriteGuard<'static, ContextList> {
     CONTEXTS.call_once(init_contexts).write()
 }
 
+/// Switch to the next context
+/// Do not call this while holding locks!
+pub unsafe fn context_switch() {
+
+
+    current.arch.switch_to(&mut next.arch);
+}
+
 /// A context, which identifies either a process or a thread
 #[derive(Debug)]
 pub struct Context {
     /// The ID of this context
     pub id: usize,
+    /// The architecture specific context
+    pub arch: ArchContext,
     /// The open files in the scheme
     pub files: Vec<Option<file::File>>
 }
 
 impl Context {
+    /// Create a new context
     pub fn new(id: usize) -> Context {
         Context {
             id: id,
+            arch: ArchContext::new(),
             files: Vec::new()
         }
     }

kernel/lib.rs

@@ -110,12 +110,24 @@ pub mod syscall;
 #[cfg(test)]
 pub mod tests;
 
+pub extern fn context_test() {
+    print!("TEST\n");
+
+    loop {
+        unsafe { interrupt::enable_and_halt(); }
+    }
+}
+
 #[no_mangle]
 pub extern fn kmain() {
     context::init();
 
     print!("{}", format!("BSP: {:?}\n", syscall::getpid()));
 
+    if let Ok(context) = context::contexts_mut().spawn(context_test) {
+
+    }
+
     loop {
         unsafe { interrupt::enable_and_halt(); }
     }