| /* |
| * This file is subject to the terms and conditions of the GNU General Public |
| * License. See the file "COPYING" in the main directory of this archive |
| * for more details. |
| * |
| * Copyright (C) 1997, 1998, 1999, 2000, 2001 by Ralf Baechle |
| * Copyright (C) 1999, 2000 Silicon Graphics, Inc. |
| * Copyright (C) 2001 MIPS Technologies, Inc. |
| */ |
| #ifndef _ASM_HARDIRQ_H |
| #define _ASM_HARDIRQ_H |
| |
| #include <linux/config.h> |
| #include <linux/threads.h> |
| #include <linux/irq.h> |
| |
| typedef struct { |
| unsigned int __softirq_pending; |
| } ____cacheline_aligned irq_cpustat_t; |
| |
| #include <linux/irq_cpustat.h> /* Standard mappings for irq_cpustat_t above */ |
| |
| /* |
| * 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 16-23 are the hardirq count (max # of hardirqs: 256) |
| * |
| * - ( bit 26 is the PREEMPT_ACTIVE flag. ) |
| * |
| * PREEMPT_MASK: 0x000000ff |
| * SOFTIRQ_MASK: 0x0000ff00 |
| * HARDIRQ_MASK: 0x00ff0000 |
| */ |
| |
| #define PREEMPT_BITS 8 |
| #define SOFTIRQ_BITS 8 |
| #define HARDIRQ_BITS 8 |
| |
| #define PREEMPT_SHIFT 0 |
| #define SOFTIRQ_SHIFT (PREEMPT_SHIFT + PREEMPT_BITS) |
| #define HARDIRQ_SHIFT (SOFTIRQ_SHIFT + SOFTIRQ_BITS) |
| |
| /* |
| * 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 |
| |
| #define irq_enter() (preempt_count() += HARDIRQ_OFFSET) |
| #define irq_exit() \ |
| do { \ |
| preempt_count() -= IRQ_EXIT_OFFSET; \ |
| if (!in_interrupt() && softirq_pending(smp_processor_id())) \ |
| do_softirq(); \ |
| preempt_enable_no_resched(); \ |
| } while (0) |
| |
| #endif /* _ASM_HARDIRQ_H */ |
