1 #ifndef __ASM_SH_HARDIRQ_H
2 #define __ASM_SH_HARDIRQ_H
4 #include <linux/config.h>
5 #include <linux/threads.h>
8 /* entry.S is sensitive to the offsets of these fields */
10 unsigned int __softirq_pending;
11 } ____cacheline_aligned irq_cpustat_t;
13 #include <linux/irq_cpustat.h> /* Standard mappings for irq_cpustat_t above */
16 * We put the hardirq and softirq counter into the preemption
17 * counter. The bitmask has the following meaning:
19 * - bits 0-7 are the preemption count (max preemption depth: 256)
20 * - bits 8-15 are the softirq count (max # of softirqs: 256)
21 * - bits 16-23 are the hardirq count (max # of hardirqs: 256)
23 * - ( bit 26 is the PREEMPT_ACTIVE flag. )
25 * PREEMPT_MASK: 0x000000ff
26 * SOFTIRQ_MASK: 0x0000ff00
27 * HARDIRQ_MASK: 0x00ff0000
30 #define PREEMPT_BITS 8
31 #define SOFTIRQ_BITS 8
32 #define HARDIRQ_BITS 8
34 #define PREEMPT_SHIFT 0
35 #define SOFTIRQ_SHIFT (PREEMPT_SHIFT + PREEMPT_BITS)
36 #define HARDIRQ_SHIFT (SOFTIRQ_SHIFT + SOFTIRQ_BITS)
38 #define __MASK(x) ((1UL << (x))-1)
40 #define PREEMPT_MASK (__MASK(PREEMPT_BITS) << PREEMPT_SHIFT)
41 #define HARDIRQ_MASK (__MASK(HARDIRQ_BITS) << HARDIRQ_SHIFT)
42 #define SOFTIRQ_MASK (__MASK(SOFTIRQ_BITS) << SOFTIRQ_SHIFT)
44 #define hardirq_count() (preempt_count() & HARDIRQ_MASK)
45 #define softirq_count() (preempt_count() & SOFTIRQ_MASK)
46 #define irq_count() (preempt_count() & (HARDIRQ_MASK | SOFTIRQ_MASK))
48 #define PREEMPT_OFFSET (1UL << PREEMPT_SHIFT)
49 #define SOFTIRQ_OFFSET (1UL << SOFTIRQ_SHIFT)
50 #define HARDIRQ_OFFSET (1UL << HARDIRQ_SHIFT)
53 * The hardirq mask has to be large enough to have
54 * space for potentially all IRQ sources in the system
55 * nesting on a single CPU:
57 #if (1 << HARDIRQ_BITS) < NR_IRQS
58 # error HARDIRQ_BITS is too low!
62 * Are we in an interrupt context? Either doing bottom half
63 * or hardware interrupt processing?
65 #define in_irq() (hardirq_count())
66 #define in_softirq() (softirq_count())
67 #define in_interrupt() (irq_count())
70 #define hardirq_trylock() (!in_interrupt())
71 #define hardirq_endlock() do { } while (0)
73 #define irq_enter() (preempt_count() += HARDIRQ_OFFSET)
74 #define nmi_enter() (irq_enter())
75 #define nmi_exit() (preempt_count() -= HARDIRQ_OFFSET)
78 # define in_atomic() ((preempt_count() & ~PREEMPT_ACTIVE) != kernel_locked())
79 # define IRQ_EXIT_OFFSET (HARDIRQ_OFFSET-1)
81 # define in_atomic() (preempt_count() != 0)
82 # define IRQ_EXIT_OFFSET HARDIRQ_OFFSET
86 preempt_count() -= IRQ_EXIT_OFFSET; \
87 if (!in_interrupt() && softirq_pending(smp_processor_id())) \
89 preempt_enable_no_resched(); \
93 # define synchronize_irq(irq) barrier()
95 extern void synchronize_irq(unsigned int irq);
96 #endif /* CONFIG_SMP */
98 #endif /* __ASM_SH_HARDIRQ_H */