Changeset 302 for trunk/softs/tsar_boot/src/reset.S

Timestamp:

Feb 26, 2013, 9:19:41 AM (11 years ago)

Author:

cfuguet

Message:

Introducing IRQ_PER_PROC constant in the tsar boot loader
(pre-loader).
This constant is used to know how many XICU irq outputs
are connected to each processor.

i.e.

IRQ_PER_PROC = 3
NPROCS=2

xicu.irq_out[0] -> proc0 xicu.irq_out[3] -> proc1
xicu.irq_out[1] -> proc0 xicu.irq_out[4] -> proc1
xicu.irq_out[2] -> proc0 xicu.irq_out[5] -> proc1

This change the way the mailboxes for each processor
are calculated in the reset.S file.

File:

• trunk/softs/tsar_boot/src/reset.S (modified) (3 diffs)

trunk/softs/tsar_boot/src/reset.S

@@ -99 +99 @@
      * Compute the output index for the Write Triggered Interruption mask. 
      * Each processor enable the WTI for its irq output 
-     */
-     
-    sll     t4,     t1,     2       /* t4 <= OUT_INDEX = local_id * 4  */
-    li      t5,     (0xC << 7)      /* t5 <= FUNC      = XICU_MSK_HWI  */
-    or      t4,     t4,     t5      /* t4 <= FUNC | INDEX | 00         */
-    or      t5,     t3,     t4      /* t5 <= &XICU[MSK_WTI][OUT_INDEX] */
+     * Each processor may have IRQ_PER_PROC private irq outputs from
+     * the XICU
+     */
+
+    move    t4,     t1              /* t4 <= local_id                   */
+    li      t5,     IRQ_PER_PROC    /* t5 <= IRQ_PER_PROC               */
+    multu   t4,     t5              
+    mflo    t6                      /* t6 <= IRQ_PER_PROC * local_id    */
+    sll     t4,     t6,     2       /* t4 <= OUT_INDEX = t6 * 4         */
+
+    li      t5,     (0xC << 7)      /* t5 <= FUNC      = XICU_MSK_HWI   */
+    or      t4,     t4,     t5      /* t4 <= FUNC | INDEX | 00          */
+    or      t5,     t3,     t4      /* t5 <= &XICU[MSK_WTI][OUT_INDEX]  */
     
     /* Compute and set WTI mask */
@@ -142 +149 @@
 
     /**
-     * Jump to the boot elf loader routing routine 
+     * Jump to the boot elf loader routine 
      * Passing as argument the block number in which it must be
-     * the boot loader elf file
+     * the executable elf file to load
      */
 
@@ -209 +216 @@
 
     .set reorder
+
+/*
+ * vim: tabstop=4 : shiftwidth=4 : expandtab
+ */