Changeset 255 for soft/giet_vm/sys/giet.s

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/giet.s (modified) (3 diffs)

soft/giet_vm/sys/giet.s

@@ -9 +9 @@
 * - the _cause_vector[16] array defines the 16 causes to enter the GIET
 *   it is initialized in th exc_handler.c file
-* - the _syscall_vector[32] array defines the 32 system calls entry points
+* - the _syscall_vector[64] array defines the 64 system calls entry points
 *   it is initialised in the sys_handler.c file 
 ***********************************************************************************/
@@ -38 +38 @@
  *
  * A system call is handled as a special function call.
- *  - $2 contains the system call index (< 16).
+ *  - $2 contains the system call index (< 64).
  *  - $3 is used to store the syscall address
  *  - $4, $5, $6, $7 contain the arguments values.
@@ -62 +62 @@
     sw      $27,    20($29)         /* save it in the stack */
 
-    andi    $26,    $2,     0x1F    /* $26 <= syscall index (i < 32) */
+    andi    $26,    $2,     0x3F    /* $26 <= syscall index (i < 64) */
     sll     $26,    $26,    2       /* $26 <= index * 4 */
     la      $27,    _syscall_vector /* $27 <= &_syscall_vector[0] */