Changeset 742 for soft/giet_vm/giet_kernel

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.

Location:

soft/giet_vm/giet_kernel

Files:

• giet.s (modified) (4 diffs)
• kernel.ld (modified) (2 diffs)
• kernel_init.c (modified) (2 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.

soft/giet_vm/giet_kernel/kernel.ld

@@ -16 +16 @@
     {
         *(.giet)
+        *(.kinit)
         *(.text)
     }
@@ -24 +25 @@
         *(.kdata)
     }
-
-    . = kernel_init_vbase;
-    seg_kernel_init : 
-    {
-        *(.kinit)
-    }
 }
 

soft/giet_vm/giet_kernel/kernel_init.c

@@ -137 +137 @@
 
 ////////////////////////////////////////////////////////////////////////////////
-// This kernel_init() function completes the kernel initialisation in 5 steps:
+// This _kernel_init() function completes the kernel initialisation in 5 steps:
 // Step 0 is done by processor[0,0,0]. Steps 1 to 4 are executed in parallel
 // by all processors.
@@ -146 +146 @@
 // - step 4 : Each processor set sp, sr, ptpr, epc registers values. 
 ////////////////////////////////////////////////////////////////////////////////
-__attribute__((section (".kinit"))) void kernel_init() 
+__attribute__((section (".kinit"))) void _kernel_init() 
 {
     // gpid  : hardware processor index (fixed format: X_WIDTH|Y_WIDTH|P_WIDTH)