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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 | /* * arch/s390/kernel/s390_ext.c * * S390 version * Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation * Author(s): Holger Smolinski (Holger.Smolinski@de.ibm.com), * Martin Schwidefsky (schwidefsky@de.ibm.com) */ #include <linux/module.h> #include <linux/kernel.h> #include <linux/slab.h> #include <linux/errno.h> #include <linux/kernel_stat.h> #include <asm/lowcore.h> #include <asm/s390_ext.h> #include <asm/irq.h> /* * Simple hash strategy: index = code & 0xff; * ext_int_hash[index] is the start of the list for all external interrupts * that hash to this index. With the current set of external interrupts * (0x1202 external call, 0x1004 cpu timer, 0x2401 hwc console, 0x4000 * iucv and 0x2603 pfault) this is always the first element. */ ext_int_info_t *ext_int_hash[256] = { 0, }; int register_external_interrupt(__u16 code, ext_int_handler_t handler) { ext_int_info_t *p; int index; p = (ext_int_info_t *) kmalloc(sizeof(ext_int_info_t), GFP_ATOMIC); if (p == NULL) return -ENOMEM; p->code = code; p->handler = handler; index = code & 0xff; p->next = ext_int_hash[index]; ext_int_hash[index] = p; return 0; } int register_early_external_interrupt(__u16 code, ext_int_handler_t handler, ext_int_info_t *p) { int index; if (p == NULL) return -EINVAL; p->code = code; p->handler = handler; index = code & 0xff; p->next = ext_int_hash[index]; ext_int_hash[index] = p; return 0; } int unregister_external_interrupt(__u16 code, ext_int_handler_t handler) { ext_int_info_t *p, *q; int index; index = code & 0xff; q = NULL; p = ext_int_hash[index]; while (p != NULL) { if (p->code == code && p->handler == handler) break; q = p; p = p->next; } if (p == NULL) return -ENOENT; if (q != NULL) q->next = p->next; else ext_int_hash[index] = p->next; kfree(p); return 0; } int unregister_early_external_interrupt(__u16 code, ext_int_handler_t handler, ext_int_info_t *p) { ext_int_info_t *q; int index; if (p == NULL || p->code != code || p->handler != handler) return -EINVAL; index = code & 0xff; q = ext_int_hash[index]; if (p != q) { while (q != NULL) { if (q->next == p) break; q = q->next; } if (q == NULL) return -ENOENT; q->next = p->next; } else ext_int_hash[index] = p->next; return 0; } void do_extint(struct pt_regs *regs, unsigned short code) { ext_int_info_t *p; int index; irq_enter(); asm volatile ("mc 0,0"); if (S390_lowcore.int_clock >= S390_lowcore.jiffy_timer) account_ticks(regs); kstat_cpu(smp_processor_id()).irqs[EXTERNAL_INTERRUPT]++; index = code & 0xff; for (p = ext_int_hash[index]; p; p = p->next) { if (likely(p->code == code)) { if (likely(p->handler)) p->handler(regs, code); } } irq_exit(); } EXPORT_SYMBOL(register_external_interrupt); EXPORT_SYMBOL(unregister_external_interrupt); |