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git.proxmox.com Git - mirror_ubuntu-zesty-kernel.git/blob - include/linux/hardirq.h
1 #ifndef LINUX_HARDIRQ_H
2 #define LINUX_HARDIRQ_H
4 #include <linux/config.h>
5 #include <linux/preempt.h>
6 #include <linux/smp_lock.h>
7 #include <asm/hardirq.h>
8 #include <asm/system.h>
11 * We put the hardirq and softirq counter into the preemption
12 * counter. The bitmask has the following meaning:
14 * - bits 0-7 are the preemption count (max preemption depth: 256)
15 * - bits 8-15 are the softirq count (max # of softirqs: 256)
17 * The hardirq count can be overridden per architecture, the default is:
19 * - bits 16-27 are the hardirq count (max # of hardirqs: 4096)
20 * - ( bit 28 is the PREEMPT_ACTIVE flag. )
22 * PREEMPT_MASK: 0x000000ff
23 * SOFTIRQ_MASK: 0x0000ff00
24 * HARDIRQ_MASK: 0x0fff0000
26 #define PREEMPT_BITS 8
27 #define SOFTIRQ_BITS 8
30 #define HARDIRQ_BITS 12
32 * The hardirq mask has to be large enough to have space for potentially
33 * all IRQ sources in the system nesting on a single CPU.
35 #if (1 << HARDIRQ_BITS) < NR_IRQS
36 # error HARDIRQ_BITS is too low!
40 #define PREEMPT_SHIFT 0
41 #define SOFTIRQ_SHIFT (PREEMPT_SHIFT + PREEMPT_BITS)
42 #define HARDIRQ_SHIFT (SOFTIRQ_SHIFT + SOFTIRQ_BITS)
44 #define __IRQ_MASK(x) ((1UL << (x))-1)
46 #define PREEMPT_MASK (__IRQ_MASK(PREEMPT_BITS) << PREEMPT_SHIFT)
47 #define SOFTIRQ_MASK (__IRQ_MASK(SOFTIRQ_BITS) << SOFTIRQ_SHIFT)
48 #define HARDIRQ_MASK (__IRQ_MASK(HARDIRQ_BITS) << HARDIRQ_SHIFT)
50 #define PREEMPT_OFFSET (1UL << PREEMPT_SHIFT)
51 #define SOFTIRQ_OFFSET (1UL << SOFTIRQ_SHIFT)
52 #define HARDIRQ_OFFSET (1UL << HARDIRQ_SHIFT)
54 #if PREEMPT_ACTIVE < (1 << (HARDIRQ_SHIFT + HARDIRQ_BITS))
55 #error PREEMPT_ACTIVE is too low!
58 #define hardirq_count() (preempt_count() & HARDIRQ_MASK)
59 #define softirq_count() (preempt_count() & SOFTIRQ_MASK)
60 #define irq_count() (preempt_count() & (HARDIRQ_MASK | SOFTIRQ_MASK))
63 * Are we doing bottom half or hardware interrupt processing?
64 * Are we in a softirq context? Interrupt context?
66 #define in_irq() (hardirq_count())
67 #define in_softirq() (softirq_count())
68 #define in_interrupt() (irq_count())
70 #if defined(CONFIG_PREEMPT) && !defined(CONFIG_PREEMPT_BKL)
71 # define in_atomic() ((preempt_count() & ~PREEMPT_ACTIVE) != kernel_locked())
73 # define in_atomic() ((preempt_count() & ~PREEMPT_ACTIVE) != 0)
77 # define preemptible() (preempt_count() == 0 && !irqs_disabled())
78 # define IRQ_EXIT_OFFSET (HARDIRQ_OFFSET-1)
80 # define preemptible() 0
81 # define IRQ_EXIT_OFFSET HARDIRQ_OFFSET
85 extern void synchronize_irq(unsigned int irq
);
87 # define synchronize_irq(irq) barrier()
90 #define nmi_enter() irq_enter()
91 #define nmi_exit() sub_preempt_count(HARDIRQ_OFFSET)
93 #ifndef CONFIG_VIRT_CPU_ACCOUNTING
94 static inline void account_user_vtime(struct task_struct
*tsk
)
98 static inline void account_system_vtime(struct task_struct
*tsk
)
103 #define irq_enter() \
105 account_system_vtime(current); \
106 add_preempt_count(HARDIRQ_OFFSET); \
109 extern void irq_exit(void);
111 #endif /* LINUX_HARDIRQ_H */