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/* * 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) 1994 by Waldorf GMBH, written by Ralf Baechle * Copyright (C) 1995, 96, 97, 98, 99, 2000, 01, 02, 03 by Ralf Baechle */ #ifndef _ASM_IRQ_H #define _ASM_IRQ_H #include <linux/linkage.h> #include <linux/smp.h> #include <linux/irqdomain.h> #include <asm/mipsmtregs.h> #include <irq.h> #define IRQ_STACK_SIZE THREAD_SIZE #define IRQ_STACK_START (IRQ_STACK_SIZE - 16) extern void *irq_stack[NR_CPUS]; /* * The highest address on the IRQ stack contains a dummy frame put down in * genex.S (handle_int & except_vec_vi_handler) which is structured as follows: * * top ------------ * | task sp | <- irq_stack[cpu] + IRQ_STACK_START * ------------ * | | <- First frame of IRQ context * ------------ * * task sp holds a copy of the task stack pointer where the struct pt_regs * from exception entry can be found. */ static inline bool on_irq_stack(int cpu, unsigned long sp) { unsigned long low = (unsigned long)irq_stack[cpu]; unsigned long high = low + IRQ_STACK_SIZE; return (low <= sp && sp <= high); } #ifdef CONFIG_I8259 static inline int irq_canonicalize(int irq) { return ((irq == I8259A_IRQ_BASE + 2) ? I8259A_IRQ_BASE + 9 : irq); } #else #define irq_canonicalize(irq) (irq) /* Sane hardware, sane code ... */ #endif asmlinkage void plat_irq_dispatch(void); extern void do_IRQ(unsigned int irq); extern void arch_init_irq(void); extern void spurious_interrupt(void); extern int allocate_irqno(void); extern void alloc_legacy_irqno(void); extern void free_irqno(unsigned int irq); /* * Before R2 the timer and performance counter interrupts were both fixed to * IE7. Since R2 their number has to be read from the c0_intctl register. */ #define CP0_LEGACY_COMPARE_IRQ 7 #define CP0_LEGACY_PERFCNT_IRQ 7 extern int cp0_compare_irq; extern int cp0_compare_irq_shift; extern int cp0_perfcount_irq; extern int cp0_fdc_irq; extern int get_c0_fdc_int(void); void arch_trigger_cpumask_backtrace(const struct cpumask *mask, bool exclude_self); #define arch_trigger_cpumask_backtrace arch_trigger_cpumask_backtrace #endif /* _ASM_IRQ_H */
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