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 /*
  13  * In the SMP case we use the local APIC timer interrupt to do the
  14  * profiling, except when we simulate SMP mode on a uniprocessor
  15  * system, in that case we have to call the local interrupt handler.
  16  */
  17 #ifndef CONFIG_X86_LOCAL_APIC
  18         profile_tick(CPU_PROFILING, regs);
  19 #else
  20         if (!using_apic_timer)
  21                 smp_local_timer_interrupt(regs);
  22 #endif
  23 }
  24
  25 static inline int do_timer_overflow(int count)
  26 {
  27         int i;
  28
  29         spin_lock(&i8259A_lock);
  30         /*
  31          * This is tricky when I/O APICs are used;
  32          * see do_timer_interrupt().
  33          */
  34         i = inb(0x20);
  35         spin_unlock(&i8259A_lock);
  36
  37         /* assumption about timer being IRQ0 */
  38         if (i & 0x01) {
  39                 /*
  40                  * We cannot detect lost timer interrupts ...
  41                  * well, that's why we call them lost, don't we? :)
  42                  * [hmm, on the Pentium and Alpha we can ... sort of]
  43                  */
  44                 count -= LATCH;
  45         } else {
  46                 printk("do_slow_gettimeoffset(): hardware timer problem?\n");
  47         }
  48         return count;
  49 }