Changeset 742 for soft/giet_vm/giet_kernel/giet.s

Timestamp:

Dec 10, 2015, 1:38:43 PM (9 years ago)

Author:

alain

Message:

Remove the seg_kernel_init vseg: All the kernel code is now packed
in one single seg_kernel_code vseg. The entry point for the _kernel_init()
function (from the boot code is now at vaddr = 0x80000000.
The goal is to use only one BPP per cluster for the replicated kernel code.

File:

• soft/giet_vm/giet_kernel/giet.s (modified) (4 diffs)

soft/giet_vm/giet_kernel/giet.s

@@ -1 +1 @@
 /************************************************************************************
-* GIET: Interruption/Exception/Trap Handler for MIPS32 processor
+* This file contains the two entry points in the GIET_VM code:
+* - the _init entry point (from the boot code)      is 0x80000000 
+* - the _giet entry point (from user applications)  is 0x80000180 
+* => The base address of the segment containing this code MUST be 0x80000000.
 *
-* The base address of the segment containing this code MUST be 0x80000000, in
-* order to have the entry point at address 0x80000180!!! All messages are
-* printed on the TTY corresponding to the task&processor identifiers.
-*
-* It uses two arrays of functions:
+* The _giet uses two arrays of functions:
 * - the _cause_vector[16] array defines the 16 causes to enter the GIET
 *   it is initialized in th exc_handler.c file
@@ -14 +13 @@
 
     .section .giet, "ax", @progbits
-    .space 0x180
+
+/*
+ * INIT entry point (at address 0x80000000)
+ */
+
+    .func   _init
+    .type   _init, %function
+
+_init:
+    la      $26,    _kernel_init
+    jr      $26                        /* jump to _kernel_init */
+
+    .endfunc
+    .size _init, .-_init
+
+    .space  0x170                      /* the _entry function occupies 16 bytes */
 
 /*
@@ -29 +43 @@
     addu    $26,    $26,    $27             /* $26 <= &_cause_vector[XCODE] */
     lw      $26,    ($26)               /* $26 <=  _cause_vector[XCODE] */
-    jr      $26                         /* Jump indexed by XCODE */
+    jr      $26                         /* Jump to handler indexed by XCODE */
 
     .endfunc
@@ -35 +49 @@
 
 /*
- * *** System Call Handler ***
+ * *** Syscall Handler ***
  *
  * A system call is handled as a special function call.