Changeset 199 for soft/giet_vm/sys/switch.s

Timestamp:

Aug 9, 2012, 2:38:06 PM (12 years ago)

Author:

alain

Message:

Introducing the "idle" to improve the exit mechanism.

File:

• soft/giet_vm/sys/switch.s (modified) (5 diffs)

soft/giet_vm/sys/switch.s

@@ -2 +2 @@
 * This function receives two arguments that are the current task context 
 * physical addresses and the next task context physical address.
+* The DTLB is temporary desactivated...
 ******************************************************************************/
 
@@ -17 +18 @@
     add     $27,    $4,     $0  /* $27 <= &context[curr_task_id] */
 
-    mfc0    $26,    $12         /* $26 <= SR */
-    sw      $26,    0*4($27)    /* ctx[0] <= SR */
     .set noat
     sw      $1,     1*4($27)    /* ctx[1] <= $1 */
@@ -47 +46 @@
     sw      $25,    25*4($27)   /* ctx[25] <= $25 */
     mflo    $26
-    sw      $26,    26*4($27)   /* ctx[26] <= LO */
+    sw      $26,    26*4($27)   /* ctx[26] <= LO  */
     mfhi    $26
-    sw      $26,    27*4($27)   /* ctx[27] <= H1 */
+    sw      $26,    27*4($27)   /* ctx[27] <= H1  */
     sw      $28,    28*4($27)   /* ctx[28] <= $28 */
     sw      $29,    29*4($27)   /* ctx[29] <= $29 */
@@ -57 +56 @@
     sw      $26,    32*4($27)   /* ctx[32] <= EPC */
     mfc0    $26,    $13
-    sw      $26,    33*4($27)   /* ctx[33] <= CR */
+    sw      $26,    33*4($27)   /* ctx[33] <= CR  */
+    mfc0    $26,    $12
+    sw      $26,    34*4($27)   /* ctx[34] <= SR  */
+    mfc0    $26,    $8
+    sw      $26,    35*4($27)   /* ctx[34] <= BVAR */
     mfc2    $26,    $0
-    sw      $26,    35*4($27)   /* ctx[35] <= PTPR */
+    sw      $26,    39*4($27)   /* ctx[35] <= PTPR */
 
     /* restore next task context */
     add     $27,    $5,     $0  /* $27<= &context[next_task_id] */
 
-    lw      $26,    35*4($27)
-    mtc2    $26,    $0          /* restore PTPR */
-    lw      $26,    0*4($27)
-    mtc0    $26,    $12         /* restore SR */
     .set noat
     lw      $1,     1*4($27)    /* restore $1 */
@@ -107 +106 @@
     lw      $26,    33*4($27)
     mtc0    $26,    $13         /* restore CR */
+    lw      $26,    34*4($27)
+    mtc0    $26,    $12         /* restore SR */
+    lw      $26,    35*4($27)
+    mtc0    $26,    $8          /* restore BVAR */
+    lw      $26,    39*4($27)
+    mtc2    $26,    $0          /* restore PTPR */
 
     /* activate DTLB */