Changeset 32f3e34 in rtems

Timestamp:

09/24/98 13:55:18 (25 years ago)

Author:

Joel Sherrill <joel.sherrill@…>

Branches:

4.10, 4.11, 4.8, 4.9, 5, master

Children:

da38d8a

Parents:

287e9584

Message:

Patch from Erik Ivanenko <erik.ivanenko@…>:

Please find attached a start.s that includes a cli prior to the hlt
instruction. This ensures that external interrupts cannot restart
the system after returning to the startup code. ( According to the hlt
docs, they will! )

Also find a new timer.c. ( I forgot to update the countdowm value
in the timer when I changed the PSCLK frequency in start.s) . This
improves timer accuracy.

The raw_idt_notify messages are no longer infinite, I tested sp11 and
sp05, both which were bad, and I have seen the message print once in
one test. I think it's ok if it prints out once. In fact, I don't
think you can effectively stop it!

Location:

c/src/lib/libbsp/i386/i386ex

Files:

• start/start.s (modified) (6 diffs)
• timer/timer.c (modified) (3 diffs)

c/src/lib/libbsp/i386/i386ex/start/start.s

@@ -66 +66 @@
         
 BEGIN_DATA
-/*      .section        .gdt */
          PUBLIC (_Global_descriptor_table)
                         
@@ -345 +344 @@
 * So, move the whole data section down.
 ********************************************************/
-                
-/* SYM(xfer_gdt):               
-        movw $ _ram_gdt_offset  , di
-        movw $ _ram_gdt_segment , cx 
-        mov  cx                 , es
-
-        movw $ _gdt_size        , cx 
-        movw $ _rom_gdt_segment , ax 
-        movw $ _rom_gdt_offset  , si 
-        mov  ax                 , ds
-        
-        repne
-        movsb
-*/
 
         movw $ _ram_data_offset , di
@@ -377 +362 @@
  ****************************/
         
-/*      movw $ _ram_gdt_segment, ax */
-
 #ifdef NEXT_GAS 
         data32
         addr32
 #endif  
-/*        lgdt  _ram_gdt_offset     #  location of GDT */
-
         lgdt SYM(GDTR) #  location of GDT
 
@@ -406 +387 @@
  *********************/
 
-/*      ljmpl $ GDT_CODE_PTR , $  SYM(_copy_data) # sets the code selector*/
         ljmpl $ GDT_CODE_PTR , $  SYM(_load_segment_registers) # sets the code selector
         
 /*
- * Copy the data section down to RAM
- */
-/*SYM(_copy_data): */
+ * Load the segment registers
+ */
 SYM(_load_segment_registers):   
         .code32
@@ -421 +400 @@
         pLOAD_SEGMENT( GDT_DATA_PTR, es)
         
-/*      movl            $ SYM(_data_start)      , edi # ram destination
-        movl            $ SYM(_rom_data_start)  , esi # rom data source
-        movl            $ SYM(_data_size)       , ecx # amount to move
-        repne                                         # while ecx != 0
-        movsb                                         #   move a byte   
-*/
 /*
  *  Set up the stack
@@ -460 +433 @@
         call SYM(boot_card)
         addl    $12,esp
-        
-        hlt
+
+        cli                              # stops interrupts from being processed after hlt!
+        hlt                              # shutdown
 
 END

c/src/lib/libbsp/i386/i386ex/timer/timer.c

@@ -48 +48 @@
 
   outport_byte  ( TMRCON , 0xb0 ); /* select tmr2, stay in mode 0 */
-  outport_byte  ( TMR1   , 0xd2 ); /* set to 250 usec interval */
+  outport_byte  ( TMR1   , 0xfa ); /* set to 250 usec interval */
   outport_byte  ( TMR1   , 0x00 );
   outport_byte  ( TMRCON , 0x64 ); /* change to mode 2 ( starts timer ) */ 
@@ -79 +79 @@
 {
  if (!i386_delete_idt_entry(&timer_raw_irq_data)) {
-      printk("Timer raw handler deconnexion failed\n");
+      printk("Timer_exit:Timer raw handler removal failed\n");
       rtems_fatal_error_occurred(1);
  }
@@ -95 +95 @@
     atexit(Timer_exit); /* Try not to hose the system at exit. */
     if (!i386_set_idt_entry (&timer_raw_irq_data)) {
-      printk("raw handler connexion failed\n");
+      printk("Timer_initialize: raw handler installation failed\n");
       rtems_fatal_error_occurred(1);
     }