1 #ifndef __ASM_HARDIRQ_H
2 #define __ASM_HARDIRQ_H
4 #include <linux/config.h>
5 #include <linux/threads.h>
9 #define __ARCH_IRQ_STAT 1
11 /* Generate a lvalue for a pda member. Should fix softirq.c instead to use
12 special access macros. This would generate better code. */
13 #define __IRQ_STAT(cpu,member) (read_pda(me)->member)
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 * HARDIRQ_MASK: 0x0000ff00
29 * SOFTIRQ_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)
40 #define __MASK(x) ((1UL << (x))-1)
42 #define PREEMPT_MASK (__MASK(PREEMPT_BITS) << PREEMPT_SHIFT)
43 #define HARDIRQ_MASK (__MASK(HARDIRQ_BITS) << HARDIRQ_SHIFT)
44 #define SOFTIRQ_MASK (__MASK(SOFTIRQ_BITS) << SOFTIRQ_SHIFT)
46 #define hardirq_count() (preempt_count() & HARDIRQ_MASK)
47 #define softirq_count() (preempt_count() & SOFTIRQ_MASK)
48 #define irq_count() (preempt_count() & (HARDIRQ_MASK | SOFTIRQ_MASK))
50 #define PREEMPT_OFFSET (1UL << PREEMPT_SHIFT)
51 #define SOFTIRQ_OFFSET (1UL << SOFTIRQ_SHIFT)
52 #define HARDIRQ_OFFSET (1UL << HARDIRQ_SHIFT)
55 * The hardirq mask has to be large enough to have
56 * space for potentially all IRQ sources in the system
57 * nesting on a single CPU:
59 #if (1 << HARDIRQ_BITS) < NR_IRQS
60 # error HARDIRQ_BITS is too low!
64 * Are we doing bottom half or hardware interrupt processing?
65 * Are we in a softirq context? Interrupt context?
67 #define in_irq() (hardirq_count())
68 #define in_softirq() (softirq_count())
69 #define in_interrupt() (irq_count())
72 #define hardirq_trylock() (!in_interrupt())
73 #define hardirq_endlock() do { } while (0)
75 #define irq_enter() (preempt_count() += HARDIRQ_OFFSET)
76 #define nmi_enter() (irq_enter())
77 #define nmi_exit() (preempt_count() -= HARDIRQ_OFFSET)
81 # include <linux/smp_lock.h>
82 # define in_atomic() ((preempt_count() & ~PREEMPT_ACTIVE) != kernel_locked())
83 # define IRQ_EXIT_OFFSET (HARDIRQ_OFFSET-1)
85 # define in_atomic() (preempt_count() != 0)
86 # define IRQ_EXIT_OFFSET HARDIRQ_OFFSET
90 preempt_count() -= IRQ_EXIT_OFFSET; \
91 if (!in_interrupt() && softirq_pending(smp_processor_id())) \
93 preempt_enable_no_resched(); \
97 # define synchronize_irq(irq) barrier()
99 extern void synchronize_irq(unsigned int irq);
100 #endif /* CONFIG_SMP */
102 #endif /* __ASM_HARDIRQ_H */