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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 | #ifndef _ASM_IA64_HARDIRQ_H #define _ASM_IA64_HARDIRQ_H /* * Copyright (C) 1998-2002 Hewlett-Packard Co * David Mosberger-Tang <davidm@hpl.hp.com> */ #include <linux/config.h> #include <linux/threads.h> #include <linux/irq.h> #include <asm/processor.h> /* * No irq_cpustat_t for IA-64. The data is held in the per-CPU data structure. */ #define __ARCH_IRQ_STAT 1 #define softirq_pending(cpu) (cpu_data(cpu)->softirq_pending) #define syscall_count(cpu) /* unused on IA-64 */ #define ksoftirqd_task(cpu) (cpu_data(cpu)->ksoftirqd) #define nmi_count(cpu) 0 #define local_softirq_pending() (local_cpu_data->softirq_pending) #define local_syscall_count() /* unused on IA-64 */ #define local_ksoftirqd_task() (local_cpu_data->ksoftirqd) #define local_nmi_count() 0 /* * We put the hardirq and softirq counter into the preemption counter. The bitmask has the * following meaning: * * - bits 0-7 are the preemption count (max preemption depth: 256) * - bits 8-15 are the softirq count (max # of softirqs: 256) * - bits 16-29 are the hardirq count (max # of hardirqs: 16384) * * - (bit 63 is the PREEMPT_ACTIVE flag---not currently implemented.) * * PREEMPT_MASK: 0x000000ff * SOFTIRQ_MASK: 0x0000ff00 * HARDIRQ_MASK: 0x3fff0000 */ #define PREEMPT_BITS 8 #define SOFTIRQ_BITS 8 #define HARDIRQ_BITS 14 #define PREEMPT_SHIFT 0 #define SOFTIRQ_SHIFT (PREEMPT_SHIFT + PREEMPT_BITS) #define HARDIRQ_SHIFT (SOFTIRQ_SHIFT + SOFTIRQ_BITS) #define __MASK(x) ((1UL << (x))-1) #define PREEMPT_MASK (__MASK(PREEMPT_BITS) << PREEMPT_SHIFT) #define HARDIRQ_MASK (__MASK(HARDIRQ_BITS) << HARDIRQ_SHIFT) #define SOFTIRQ_MASK (__MASK(SOFTIRQ_BITS) << SOFTIRQ_SHIFT) #define hardirq_count() (preempt_count() & HARDIRQ_MASK) #define softirq_count() (preempt_count() & SOFTIRQ_MASK) #define irq_count() (preempt_count() & (HARDIRQ_MASK | SOFTIRQ_MASK)) #define PREEMPT_OFFSET (1UL << PREEMPT_SHIFT) #define SOFTIRQ_OFFSET (1UL << SOFTIRQ_SHIFT) #define HARDIRQ_OFFSET (1UL << HARDIRQ_SHIFT) /* * The hardirq mask has to be large enough to have space for potentially all IRQ sources * in the system nesting on a single CPU: */ #if (1 << HARDIRQ_BITS) < NR_IRQS # error HARDIRQ_BITS is too low! #endif /* * Are we doing bottom half or hardware interrupt processing? * Are we in a softirq context? * Interrupt context? */ #define in_irq() (hardirq_count()) #define in_softirq() (softirq_count()) #define in_interrupt() (irq_count()) #define hardirq_trylock() (!in_interrupt()) #define hardirq_endlock() do { } while (0) #define irq_enter() (preempt_count() += HARDIRQ_OFFSET) #ifdef CONFIG_PREEMPT # include <linux/smp_lock.h> # define in_atomic() ((preempt_count() & ~PREEMPT_ACTIVE) != kernel_locked()) # define IRQ_EXIT_OFFSET (HARDIRQ_OFFSET-1) #else # define in_atomic() (preempt_count() != 0) # define IRQ_EXIT_OFFSET HARDIRQ_OFFSET #endif #define irq_exit() \ do { \ preempt_count() -= IRQ_EXIT_OFFSET; \ if (!in_interrupt() && local_softirq_pending()) \ do_softirq(); \ preempt_enable_no_resched(); \ } while (0) #ifdef CONFIG_SMP extern void synchronize_irq (unsigned int irq); #else # define synchronize_irq(irq) barrier() #endif /* CONFIG_SMP */ #endif /* _ASM_IA64_HARDIRQ_H */ |