Changeset 407 for trunk/hal/generic/hal_context.h

Timestamp:

Nov 7, 2017, 3:08:12 PM (6 years ago)

Author:

alain

Message:

First implementation of fork/exec.

File:

• trunk/hal/generic/hal_context.h (modified) (2 diffs)

trunk/hal/generic/hal_context.h

@@ -40 +40 @@
 
 /****************************************************************************************
- * This function allocates, from the local cluster, the physical memory required for 
- * the thread CPU context, initialises it, and links the context to the thread.
+ * This function allocates memory for a CPU context and links it to the thread
+ * identified by the <thread> argument. The context is not initialised.
+ ****************************************************************************************
+ * @ return 0 if success / return -1 if failure.
+ ***************************************************************************************/
+error_t hal_cpu_context_alloc( struct thread_s * thread );
+
+/****************************************************************************************
+ * This function allocates memory for a CPU context, initialize it from scratch,
+ * and links it to the thread identified by the <thread> argument.
  ****************************************************************************************
  * @ thread  : pointer on the thread descriptor.
- * @ return 0 if success / return ENOMEM if error
+ * @ return 0 if success / return -1 if failure.
  ***************************************************************************************/
 error_t hal_cpu_context_create( struct thread_s * thread );
 
 /****************************************************************************************
- * This function allocates, from the local cluster, the physical memory required for 
- * a thread CPU context, initialises it from values contained in "src" thread context,
- * and links the context to the "dst" thread.
+ * This function display the following slots of a thread CPU context:
+ * - GPR : gp_28 , sp_29 , ra_31
+ * - CP0 : c0_sr , c0_th , c0_epc
+ * - CP2 : c2_ptpr , c2-mode
  ****************************************************************************************
- * @ dst  : pointer on the destination thread descriptor.
- * @ src  : pointer on the source thread descriptor.
- * @ return 0 if success / return ENOMEM if error
+ * @ thread  : local pointer on the thread descriptor.
  ***************************************************************************************/
-error_t hal_cpu_context_copy( struct thread_s * dst,
-                              struct thread_s * src );
+void hal_cpu_context_display( struct thread_s * thread );
 
 /****************************************************************************************
@@ -67 +73 @@
 void hal_cpu_context_destroy( struct thread_s * thread );
 
-/****************************************************************************************
- * This function performs a context switch, saving the CPU register values into the
- * old thread, and initializing these registers with the values of the new thread.
- ****************************************************************************************
- * @ old     : pointer on current thread.
- * @ new     : pointer on the thread we want to switch to.
- ***************************************************************************************/
-void hal_cpu_context_switch( struct thread_s * old , struct thread_s * new );
+
+
+
+
+
 
 /****************************************************************************************
- * This function loads the relevant CPU registers from values contained in
- * the thread context. It should be called for a thread that has not been executed yet.
- * It reset the loadable flag in thread descriptor.
+ * This function allocates memory for a FPU context, reset all entries,
+ * and links it to the thread identified by the <thread> argument.
  ****************************************************************************************
  * @ thread  : pointer on the thread descriptor.
+ * @ return 0 if success / return -1 if failure.
  ***************************************************************************************/
-void hal_cpu_context_load( struct thread_s * thread );
+error_t hal_fpu_context_alloc( struct thread_s * thread );
 
 /****************************************************************************************
- * This function allocates, from the local cluster, the physical memory required for 
- * the thread FPU context, and initialises the thread pointer.
- ****************************************************************************************
- * @ thread  : pointer on the thread descriptor.
- * @ return 0 if success / return ENOMEM if error
- ***************************************************************************************/
-error_t hal_fpu_context_create( struct thread_s * thread );
-
-/****************************************************************************************
- * This function allocates, from the local cluster, the physical memory required for 
- * a thread FPU context, initialises it from values contained in "src" thread context,
- * and link the context to the "dst" thread.
+ * This function copies a FPU context defined by the <src> argument to the FPU context
+ * defined by the <dst> argument. It is used by the fork system call.
  ****************************************************************************************
  * @ dst  : pointer on the destination thread descriptor.
  * @ src  : pointer on the source thread descriptor.
- * @ return 0 if success / return ENOMEM if error
  ***************************************************************************************/
-error_t hal_fpu_context_copy( struct thread_s * dst,
+void hal_fpu_context_copy( struct thread_s * dst,
                            struct thread_s * src );