1 /* 2 * This file is subject to the terms and conditions of the GNU General Public 3 * License. See the file "COPYING" in the main directory of this archive 4 * for more details. 5 * 6 * Copyright (C) 1994 by Waldorf GMBH, written by Ralf Baechle 7 * Copyright (C) 1995, 96, 97, 98, 99, 2000, 01, 02, 03 by Ralf Baechle 8 */ 9 #ifndef _ASM_IRQ_H 10 #define _ASM_IRQ_H 11 12 #include <linux/linkage.h> 13 #include <linux/smp.h> 14 15 #include <asm/mipsmtregs.h> 16 17 #include <irq.h> 18 19 #define IRQ_STACK_SIZE THREAD_SIZE 20 #define IRQ_STACK_START (IRQ_STACK_SIZE - 16) 21 22 extern void *irq_stack[NR_CPUS]; 23 24 /* 25 * The highest address on the IRQ stack contains a dummy frame put down in 26 * genex.S (handle_int & except_vec_vi_handler) which is structured as follows: 27 * 28 * top ------------ 29 * | task sp | <- irq_stack[cpu] + IRQ_STACK_START 30 * ------------ 31 * | | <- First frame of IRQ context 32 * ------------ 33 * 34 * task sp holds a copy of the task stack pointer where the struct pt_regs 35 * from exception entry can be found. 36 */ 37 38 static inline bool on_irq_stack(int cpu, unsigned long sp) 39 { 40 unsigned long low = (unsigned long)irq_stack[cpu]; 41 unsigned long high = low + IRQ_STACK_SIZE; 42 43 return (low <= sp && sp <= high); 44 } 45 46 #ifdef CONFIG_I8259 47 static inline int irq_canonicalize(int irq) 48 { 49 return ((irq == I8259A_IRQ_BASE + 2) ? I8259A_IRQ_BASE + 9 : irq); 50 } 51 #else 52 #define irq_canonicalize(irq) (irq) /* Sane hardware, sane code ... */ 53 #endif 54 55 asmlinkage void plat_irq_dispatch(void); 56 57 extern void do_IRQ(unsigned int irq); 58 59 struct irq_domain; 60 extern void do_domain_IRQ(struct irq_domain *domain, unsigned int irq); 61 62 extern void arch_init_irq(void); 63 extern void spurious_interrupt(void); 64 65 /* 66 * Before R2 the timer and performance counter interrupts were both fixed to 67 * IE7. Since R2 their number has to be read from the c0_intctl register. 68 */ 69 #define CP0_LEGACY_COMPARE_IRQ 7 70 #define CP0_LEGACY_PERFCNT_IRQ 7 71 72 extern int cp0_compare_irq; 73 extern int cp0_compare_irq_shift; 74 extern int cp0_perfcount_irq; 75 extern int cp0_fdc_irq; 76 77 extern int get_c0_fdc_int(void); 78 79 void arch_trigger_cpumask_backtrace(const struct cpumask *mask, 80 bool exclude_self); 81 #define arch_trigger_cpumask_backtrace arch_trigger_cpumask_backtrace 82 83 #endif /* _ASM_IRQ_H */ 84