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#ifndef LINUX_HARDIRQ_H #define LINUX_HARDIRQ_H #include <linux/config.h> #include <linux/preempt.h> #include <linux/smp_lock.h> #include <asm/hardirq.h> #include <asm/system.h> /* * 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) * * The hardirq count can be overridden per architecture, the default is: * * - bits 16-27 are the hardirq count (max # of hardirqs: 4096) * - ( bit 28 is the PREEMPT_ACTIVE flag. ) * * PREEMPT_MASK: 0x000000ff * SOFTIRQ_MASK: 0x0000ff00 * HARDIRQ_MASK: 0x0fff0000 */ #define PREEMPT_BITS 8 #define SOFTIRQ_BITS 8 #ifndef HARDIRQ_BITS #define HARDIRQ_BITS 12 /* * 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 #endif #define PREEMPT_SHIFT 0 #define SOFTIRQ_SHIFT (PREEMPT_SHIFT + PREEMPT_BITS) #define HARDIRQ_SHIFT (SOFTIRQ_SHIFT + SOFTIRQ_BITS) #define __IRQ_MASK(x) ((1UL << (x))-1) #define PREEMPT_MASK (__IRQ_MASK(PREEMPT_BITS) << PREEMPT_SHIFT) #define SOFTIRQ_MASK (__IRQ_MASK(SOFTIRQ_BITS) << SOFTIRQ_SHIFT) #define HARDIRQ_MASK (__IRQ_MASK(HARDIRQ_BITS) << HARDIRQ_SHIFT) #define PREEMPT_OFFSET (1UL << PREEMPT_SHIFT) #define SOFTIRQ_OFFSET (1UL << SOFTIRQ_SHIFT) #define HARDIRQ_OFFSET (1UL << HARDIRQ_SHIFT) #if PREEMPT_ACTIVE < (1 << (HARDIRQ_SHIFT + HARDIRQ_BITS)) #error PREEMPT_ACTIVE is too low! #endif #define hardirq_count() (preempt_count() & HARDIRQ_MASK) #define softirq_count() (preempt_count() & SOFTIRQ_MASK) #define irq_count() (preempt_count() & (HARDIRQ_MASK | SOFTIRQ_MASK)) /* * 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()) #if defined(CONFIG_PREEMPT) && !defined(CONFIG_PREEMPT_BKL) # define in_atomic() ((preempt_count() & ~PREEMPT_ACTIVE) != kernel_locked()) #else # define in_atomic() ((preempt_count() & ~PREEMPT_ACTIVE) != 0) #endif #ifdef CONFIG_PREEMPT # define preemptible() (preempt_count() == 0 && !irqs_disabled()) # define IRQ_EXIT_OFFSET (HARDIRQ_OFFSET-1) #else # define preemptible() 0 # define IRQ_EXIT_OFFSET HARDIRQ_OFFSET #endif #ifdef CONFIG_SMP extern void synchronize_irq(unsigned int irq); #else # define synchronize_irq(irq) barrier() #endif #define nmi_enter() irq_enter() #define nmi_exit() sub_preempt_count(HARDIRQ_OFFSET) struct task_struct; #ifndef CONFIG_VIRT_CPU_ACCOUNTING static inline void account_system_vtime(struct task_struct *tsk) { } #endif #define irq_enter() \ do { \ account_system_vtime(current); \ add_preempt_count(HARDIRQ_OFFSET); \ } while (0) extern void irq_exit(void); #endif /* LINUX_HARDIRQ_H */