ia64/xen-unstable

view xen/include/asm-ia64/linux-xen/linux/hardirq.h @ 6457:d34925e4144b

Stil more cleanup and moving to 2.6.13 base
author djm@kirby.fc.hp.com
date Thu Sep 01 11:09:27 2005 -0600 (2005-09-01)
parents 9312a3e8a6f8
children b2f4823b6ff0
line source
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>
10 /*
11 * We put the hardirq and softirq counter into the preemption
12 * counter. The bitmask has the following meaning:
13 *
14 * - bits 0-7 are the preemption count (max preemption depth: 256)
15 * - bits 8-15 are the softirq count (max # of softirqs: 256)
16 *
17 * The hardirq count can be overridden per architecture, the default is:
18 *
19 * - bits 16-27 are the hardirq count (max # of hardirqs: 4096)
20 * - ( bit 28 is the PREEMPT_ACTIVE flag. )
21 *
22 * PREEMPT_MASK: 0x000000ff
23 * SOFTIRQ_MASK: 0x0000ff00
24 * HARDIRQ_MASK: 0x0fff0000
25 */
26 #define PREEMPT_BITS 8
27 #define SOFTIRQ_BITS 8
29 #ifndef HARDIRQ_BITS
30 #define HARDIRQ_BITS 12
31 /*
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.
34 */
35 #if (1 << HARDIRQ_BITS) < NR_IRQS
36 # error HARDIRQ_BITS is too low!
37 #endif
38 #endif
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 #ifndef XEN
56 #error PREEMPT_ACTIVE is too low!
57 #endif
58 #endif
60 #define hardirq_count() (preempt_count() & HARDIRQ_MASK)
61 #define softirq_count() (preempt_count() & SOFTIRQ_MASK)
62 #define irq_count() (preempt_count() & (HARDIRQ_MASK | SOFTIRQ_MASK))
64 /*
65 * Are we doing bottom half or hardware interrupt processing?
66 * Are we in a softirq context? Interrupt context?
67 */
68 #define in_irq() (hardirq_count())
69 #define in_softirq() (softirq_count())
70 #ifdef XEN
71 #define in_interrupt() 0 // FIXME SMP LATER
72 #else
73 #define in_interrupt() (irq_count())
74 #endif
76 #if defined(CONFIG_PREEMPT) && !defined(CONFIG_PREEMPT_BKL)
77 # define in_atomic() ((preempt_count() & ~PREEMPT_ACTIVE) != kernel_locked())
78 #else
79 # define in_atomic() ((preempt_count() & ~PREEMPT_ACTIVE) != 0)
80 #endif
82 #ifdef CONFIG_PREEMPT
83 # define preemptible() (preempt_count() == 0 && !irqs_disabled())
84 # define IRQ_EXIT_OFFSET (HARDIRQ_OFFSET-1)
85 #else
86 # define preemptible() 0
87 # define IRQ_EXIT_OFFSET HARDIRQ_OFFSET
88 #endif
90 #ifdef CONFIG_SMP
91 extern void synchronize_irq(unsigned int irq);
92 #else
93 # define synchronize_irq(irq) barrier()
94 #endif
96 #define nmi_enter() irq_enter()
97 #define nmi_exit() sub_preempt_count(HARDIRQ_OFFSET)
99 #ifndef CONFIG_VIRT_CPU_ACCOUNTING
100 static inline void account_user_vtime(struct task_struct *tsk)
101 {
102 }
104 static inline void account_system_vtime(struct task_struct *tsk)
105 {
106 }
107 #endif
109 #define irq_enter() \
110 do { \
111 account_system_vtime(current); \
112 add_preempt_count(HARDIRQ_OFFSET); \
113 } while (0)
115 extern void irq_exit(void);
117 #endif /* LINUX_HARDIRQ_H */