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

   1 /* defines for inline arch setup functions */
   2
   3 #include <asm/fixmap.h>
   4 #include <asm/i8259.h>
   5 #include "cobalt.h"
   6
   7 static inline void do_timer_interrupt_hook(struct pt_regs *regs)
   8 {
   9         /* Clear the interrupt */
  10         co_cpu_write(CO_CPU_STAT,co_cpu_read(CO_CPU_STAT) & ~CO_STAT_TIMEINTR);
  11
  12         do_timer(regs);
  13 #ifndef CONFIG_SMP
  14         update_process_times(user_mode_vm(regs));
  15 #endif
  16 /*
  17  * In the SMP case we use the local APIC timer interrupt to do the
  18  * profiling, except when we simulate SMP mode on a uniprocessor
  19  * system, in that case we have to call the local interrupt handler.
  20  */
  21 #ifndef CONFIG_X86_LOCAL_APIC
  22         profile_tick(CPU_PROFILING, regs);
  23 #else
  24         if (!using_apic_timer)
  25                 smp_local_timer_interrupt(regs);
  26 #endif
  27 }
  28
  29 static inline int do_timer_overflow(int count)
  30 {
  31         int i;
  32
  33         spin_lock(&i8259A_lock);
  34         /*
  35          * This is tricky when I/O APICs are used;
  36          * see do_timer_interrupt().
  37          */
  38         i = inb(0x20);
  39         spin_unlock(&i8259A_lock);
  40
  41         /* assumption about timer being IRQ0 */
  42         if (i & 0x01) {
  43                 /*
  44                  * We cannot detect lost timer interrupts ...
  45                  * well, that's why we call them lost, don't we? :)
  46                  * [hmm, on the Pentium and Alpha we can ... sort of]
  47                  */
  48                 count -= LATCH;
  49         } else {
  50                 printk("do_slow_gettimeoffset(): hardware timer problem?\n");
  51         }
  52         return count;
  53 }