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[pohmelfs.git] / include / asm-i386 / mach-visws / do_timer.h
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1 /* defines for inline arch setup functions */
3 #include <asm/fixmap.h>
4 #include <asm/i8259.h>
5 #include "cobalt.h"
7 static inline void do_timer_interrupt_hook(struct pt_regs *regs)
9 /* Clear the interrupt */
10 co_cpu_write(CO_CPU_STAT,co_cpu_read(CO_CPU_STAT) & ~CO_STAT_TIMEINTR);
12 do_timer(regs);
13 #ifndef CONFIG_SMP
14 update_process_times(user_mode(regs));
15 #endif
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.
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
29 static inline int do_timer_overflow(int count)
31 int i;
33 spin_lock(&i8259A_lock);
35 * This is tricky when I/O APICs are used;
36 * see do_timer_interrupt().
38 i = inb(0x20);
39 spin_unlock(&i8259A_lock);
41 /* assumption about timer being IRQ0 */
42 if (i & 0x01) {
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]
48 count -= LATCH;
49 } else {
50 printk("do_slow_gettimeoffset(): hardware timer problem?\n");
52 return count;