include/asm-i386/mach-visws/do_timer.h

   1 /* defines for inline arch setup functions */
   2
   3 #include <asm/fixmap.h>
   4 #include "cobalt.h"
   5
   6 static inline void do_timer_interrupt_hook(struct pt_regs *regs)
   7 {
   8         /* Clear the interrupt */
   9         co_cpu_write(CO_CPU_STAT,co_cpu_read(CO_CPU_STAT) & ~CO_STAT_TIMEINTR);
  10
  11         do_timer(regs);
  12 #ifndef CONFIG_SMP
  13         update_process_times(user_mode(regs));
  14 #endif
  15 /*
  16  * In the SMP case we use the local APIC timer interrupt to do the
  17  * profiling, except when we simulate SMP mode on a uniprocessor
  18  * system, in that case we have to call the local interrupt handler.
  19  */
  20 #ifndef CONFIG_X86_LOCAL_APIC
  21         profile_tick(CPU_PROFILING, regs);
  22 #else
  23         if (!using_apic_timer)
  24                 smp_local_timer_interrupt(regs);
  25 #endif
  26 }
  27
  28 static inline int do_timer_overflow(int count)
  29 {
  30         int i;
  31
  32         spin_lock(&i8259A_lock);
  33         /*
  34          * This is tricky when I/O APICs are used;
  35          * see do_timer_interrupt().
  36          */
  37         i = inb(0x20);
  38         spin_unlock(&i8259A_lock);
  39
  40         /* assumption about timer being IRQ0 */
  41         if (i & 0x01) {
  42                 /*
  43                  * We cannot detect lost timer interrupts ...
  44                  * well, that's why we call them lost, don't we? :)
  45                  * [hmm, on the Pentium and Alpha we can ... sort of]
  46                  */
  47                 count -= LATCH;
  48         } else {
  49                 printk("do_slow_gettimeoffset(): hardware timer problem?\n");
  50         }
  51         return count;
  52 }