include/asm-alpha/hardirq.h

   1 #ifndef _ALPHA_HARDIRQ_H
   2 #define _ALPHA_HARDIRQ_H
   3
   4 #include <linux/config.h>
   5 #include <linux/threads.h>
   6 #include <linux/cache.h>
   7
   8
   9 /* entry.S is sensitive to the offsets of these fields */
  10 typedef struct {
  11         unsigned long __softirq_pending;
  12 } ____cacheline_aligned irq_cpustat_t;
  13
  14 #include <linux/irq_cpustat.h>  /* Standard mappings for irq_cpustat_t above */
  15
  16 #define HARDIRQ_BITS    12
  17
  18 /*
  19  * The hardirq mask has to be large enough to have
  20  * space for potentially nestable IRQ sources in the system
  21  * to nest on a single CPU. On Alpha, interrupts are masked at the CPU
  22  * by IPL as well as at the system level. We only have 8 IPLs (UNIX PALcode)
  23  * so we really only have 8 nestable IRQs, but allow some overhead
  24  */
  25 #if (1 << HARDIRQ_BITS) < 16
  26 #error HARDIRQ_BITS is too low!
  27 #endif
  28
  29 #endif /* _ALPHA_HARDIRQ_H */