Changeset 255 for soft/giet_vm/sys/drivers.c

Timestamp:

Oct 9, 2013, 9:32:41 AM (11 years ago)

Author:

meunier

Message:

• Added a syscall and some user functions to manipulate the Simulation Helper
• Changed the the way the Vseg -> Pseg mapping is made during the boot to better utilize the address space (+ adaptation of the algorithm in memo)
• Fixed a bug in boot_init (vobj_init): the vobj initialization could only be made for the first application (ptpr was not changed)

File:

• soft/giet_vm/sys/drivers.c (modified) (1 diff)

soft/giet_vm/sys/drivers.c

@@ -1834 +1834 @@
 }
 
+
+////////////////////////////////////////////////////////////////////////////////
+// _sim_helper_access()
+// Accesses the Simulation Helper Component
+// If the access is on a writable register (except SIMHELPER_PAUSE_SIM),
+// the function should never return since the simulation will stop before
+// If the access is on a readable register, returns 0 on success, 1 on failure,
+// and writes the return value at address retval
+////////////////////////////////////////////////////////////////////////////////
+unsigned int _sim_helper_access(unsigned int register_index,
+                                unsigned int value,
+                                unsigned int * retval) {
+    unsigned int * sim_helper_address = (unsigned int *) &seg_sim_base;
+    
+    if (register_index == SIMHELPER_SC_STOP ||
+        register_index == SIMHELPER_END_WITH_RETVAL ||
+        register_index == SIMHELPER_EXCEPT_WITH_VAL ||
+        register_index == SIMHELPER_PAUSE_SIM ||
+        register_index == SIMHELPER_SIGINT) {
+        sim_helper_address[register_index] = value;
+    }
+    else if (register_index == SIMHELPER_CYCLES) {
+        *retval = sim_helper_address[register_index];
+    }
+    else {
+        _get_lock(&_tty_put_lock);
+        _puts("\n[GIET ERROR] in _sim_helper_access() : access to unmapped register\n");
+        _release_lock(&_tty_put_lock);
+        return -1;
+    }
+
+    return 0;
+}
+
+
+
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