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 #include <linux/irqdomain.h> 15 16 #include <asm/mipsmtregs.h> 17 18 #include <irq.h> 19 20 #define IRQ_STACK_SIZE THREAD_SIZE 21 #define IRQ_STACK_START (IRQ_STACK_SIZE - 16) 22 23 extern void *irq_stack[NR_CPUS]; 24 25 /* 26 * The highest address on the IRQ stack contains a dummy frame put down in 27 * genex.S (handle_int & except_vec_vi_handler) which is structured as follows: 28 * 29 * top ------------ 30 * | task sp | <- irq_stack[cpu] + IRQ_STACK_START 31 * ------------ 32 * | | <- First frame of IRQ context 33 * ------------ 34 * 35 * task sp holds a copy of the task stack pointer where the struct pt_regs 36 * from exception entry can be found. 37 */ 38 39 static inline bool on_irq_stack(int cpu, unsigned long sp) 40 { 41 unsigned long low = (unsigned long)irq_stack[cpu]; 42 unsigned long high = low + IRQ_STACK_SIZE; 43 44 return (low <= sp && sp <= high); 45 } 46 47 #ifdef CONFIG_I8259 48 static inline int irq_canonicalize(int irq) 49 { 50 return ((irq == I8259A_IRQ_BASE + 2) ? I8259A_IRQ_BASE + 9 : irq); 51 } 52 #else 53 #define irq_canonicalize(irq) (irq) /* Sane hardware, sane code ... */ 54 #endif 55 56 asmlinkage void plat_irq_dispatch(void); 57 58 extern void do_IRQ(unsigned int irq); 59 60 extern void arch_init_irq(void); 61 extern void spurious_interrupt(void); 62 63 extern int allocate_irqno(void); 64 extern void alloc_legacy_irqno(void); 65 extern void free_irqno(unsigned int irq); 66 67 /* 68 * Before R2 the timer and performance counter interrupts were both fixed to 69 * IE7. Since R2 their number has to be read from the c0_intctl register. 70 */ 71 #define CP0_LEGACY_COMPARE_IRQ 7 72 #define CP0_LEGACY_PERFCNT_IRQ 7 73 74 extern int cp0_compare_irq; 75 extern int cp0_compare_irq_shift; 76 extern int cp0_perfcount_irq; 77 extern int cp0_fdc_irq; 78 79 extern int get_c0_fdc_int(void); 80 81 void arch_trigger_cpumask_backtrace(const struct cpumask *mask, 82 bool exclude_self); 83 #define arch_trigger_cpumask_backtrace arch_trigger_cpumask_backtrace 84 85 #endif /* _ASM_IRQ_H */ 86