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      1 /****************************************************************************
      2  ****************************************************************************
      3  ***
      4  ***   This header was automatically generated from a Linux kernel header
      5  ***   of the same name, to make information necessary for userspace to
      6  ***   call into the kernel available to libc.  It contains only constants,
      7  ***   structures, and macros generated from the original header, and thus,
      8  ***   contains no copyrightable information.
      9  ***
     10  ****************************************************************************
     11  ****************************************************************************/
     12 #ifndef LINUX_HARDIRQ_H
     13 #define LINUX_HARDIRQ_H
     14 
     15 #include <linux/preempt.h>
     16 #include <linux/smp_lock.h>
     17 #include <linux/lockdep.h>
     18 #include <asm/hardirq.h>
     19 #include <asm/system.h>
     20 
     21 #define PREEMPT_BITS 8
     22 #define SOFTIRQ_BITS 8
     23 
     24 #ifndef HARDIRQ_BITS
     25 #define HARDIRQ_BITS 12
     26 
     27 #if 1 << HARDIRQ_BITS < NR_IRQS
     28 #error HARDIRQ_BITS is too low!
     29 #endif
     30 #endif
     31 
     32 #define PREEMPT_SHIFT 0
     33 #define SOFTIRQ_SHIFT (PREEMPT_SHIFT + PREEMPT_BITS)
     34 #define HARDIRQ_SHIFT (SOFTIRQ_SHIFT + SOFTIRQ_BITS)
     35 
     36 #define __IRQ_MASK(x) ((1UL << (x))-1)
     37 
     38 #define PREEMPT_MASK (__IRQ_MASK(PREEMPT_BITS) << PREEMPT_SHIFT)
     39 #define SOFTIRQ_MASK (__IRQ_MASK(SOFTIRQ_BITS) << SOFTIRQ_SHIFT)
     40 #define HARDIRQ_MASK (__IRQ_MASK(HARDIRQ_BITS) << HARDIRQ_SHIFT)
     41 
     42 #define PREEMPT_OFFSET (1UL << PREEMPT_SHIFT)
     43 #define SOFTIRQ_OFFSET (1UL << SOFTIRQ_SHIFT)
     44 #define HARDIRQ_OFFSET (1UL << HARDIRQ_SHIFT)
     45 
     46 #if PREEMPT_ACTIVE < 1 << HARDIRQ_SHIFT + HARDIRQ_BITS
     47 #error PREEMPT_ACTIVE is too low!
     48 #endif
     49 
     50 #define hardirq_count() (preempt_count() & HARDIRQ_MASK)
     51 #define softirq_count() (preempt_count() & SOFTIRQ_MASK)
     52 #define irq_count() (preempt_count() & (HARDIRQ_MASK | SOFTIRQ_MASK))
     53 
     54 #define in_irq() (hardirq_count())
     55 #define in_softirq() (softirq_count())
     56 #define in_interrupt() (irq_count())
     57 
     58 #define in_atomic() ((preempt_count() & ~PREEMPT_ACTIVE) != 0)
     59 
     60 #define preemptible() 0
     61 #define IRQ_EXIT_OFFSET HARDIRQ_OFFSET
     62 
     63 #define synchronize_irq(irq) barrier()
     64 
     65 struct task_struct;
     66 
     67 #define irq_enter()   do {   account_system_vtime(current);   add_preempt_count(HARDIRQ_OFFSET);   trace_hardirq_enter();   } while (0)
     68 #define __irq_exit()   do {   trace_hardirq_exit();   account_system_vtime(current);   sub_preempt_count(HARDIRQ_OFFSET);   } while (0)
     69 
     70 #define nmi_enter() do { lockdep_off(); irq_enter(); } while (0)
     71 #define nmi_exit() do { __irq_exit(); lockdep_on(); } while (0)
     72 
     73 #endif
     74