1 #ifndef __ASM_HARDIRQ_H
2 #define __ASM_HARDIRQ_H
4 #include <linux/config.h>
5 #include <linux/threads.h>
9 unsigned int __softirq_pending;
10 unsigned long idle_timestamp;
11 unsigned int __nmi_count; /* arch dependent */
12 unsigned int apic_timer_irqs; /* arch dependent */
13 } ____cacheline_aligned irq_cpustat_t;
15 #include <linux/irq_cpustat.h> /* Standard mappings for irq_cpustat_t above */
18 * We put the hardirq and softirq counter into the preemption
19 * counter. The bitmask has the following meaning:
21 * - bits 0-7 are the preemption count (max preemption depth: 256)
22 * - bits 8-15 are the softirq count (max # of softirqs: 256)
23 * - bits 16-23 are the hardirq count (max # of hardirqs: 256)
25 * - ( bit 26 is the PREEMPT_ACTIVE flag. )
27 * PREEMPT_MASK: 0x000000ff
28 * SOFTIRQ_MASK: 0x0000ff00
29 * HARDIRQ_MASK: 0x00ff0000
32 #define PREEMPT_BITS 8
33 #define SOFTIRQ_BITS 8
34 #define HARDIRQ_BITS 8
36 #define PREEMPT_SHIFT 0
37 #define SOFTIRQ_SHIFT (PREEMPT_SHIFT + PREEMPT_BITS)
38 #define HARDIRQ_SHIFT (SOFTIRQ_SHIFT + SOFTIRQ_BITS)
41 * The hardirq mask has to be large enough to have
42 * space for potentially all IRQ sources in the system
43 * nesting on a single CPU:
45 #if (1 << HARDIRQ_BITS) < NR_IRQS
46 # error HARDIRQ_BITS is too low!
49 #define nmi_enter() (irq_enter())
50 #define nmi_exit() (preempt_count() -= HARDIRQ_OFFSET)
52 #define irq_enter() (preempt_count() += HARDIRQ_OFFSET)
55 preempt_count() -= IRQ_EXIT_OFFSET; \
56 if (!in_interrupt() && softirq_pending(smp_processor_id())) \
58 preempt_enable_no_resched(); \
61 #endif /* __ASM_HARDIRQ_H */