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s390_ext.c
资源名称：SBC-2410X_kernel.tar.gz　[点击查看]
上传用户：lgb322
上传日期：2013-02-24
资源大小：30529k
文件大小：3k
源码类别：

嵌入式Linux

开发平台：

Unix_Linux

s390_ext.c：源码内容
  1. /*
  2.  *  arch/s390/kernel/s390_ext.c
  3.  *
  4.  *  S390 version
  5.  *    Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
  6.  *    Author(s): Holger Smolinski (Holger.Smolinski@de.ibm.com),
  7.  *               Martin Schwidefsky (schwidefsky@de.ibm.com)
  8.  */
  10. #include <linux/module.h>
  11. #include <linux/kernel.h>
  12. #include <linux/slab.h>
  13. #include <asm/lowcore.h>
  14. #include <asm/s390_ext.h>
  16. /*
  17.  * Simple hash strategy: index = code & 0xff;
  18.  * ext_int_hash[index] is the start of the list for all external interrupts
  19.  * that hash to this index. With the current set of external interrupts 
  20.  * (0x1202 external call, 0x1004 cpu timer, 0x2401 hwc console, 0x4000
  21.  * iucv and 0x2603 pfault) this is always the first element. 
  22.  */
  23. ext_int_info_t *ext_int_hash[256] = { 0, };
  24. ext_int_info_t ext_int_info_timer;
  25. ext_int_info_t ext_int_info_hwc;
  26. ext_int_info_t ext_int_pfault;
  28. int register_external_interrupt(__u16 code, ext_int_handler_t handler) {
  29.         ext_int_info_t *p;
  30.         int index;
  32.         index = code & 0xff;
  33.         p = ext_int_hash[index];
  34.         while (p != NULL) {
  35.                 if (p->code == code)
  36.                         return -EBUSY;
  37.                 p = p->next;
  38.         }
  39.         if (code == 0x1004) /* time_init is done before kmalloc works :-/ */
  40.                 p = &ext_int_info_timer;
  41.         else if (code == 0x2401) /* hwc_init is done too early too */
  42.                 p = &ext_int_info_hwc;
  43.         else if (code == 0x2603) /* pfault_init is done too early too */
  44. p = &ext_int_pfault;
  45. else
  46.                 p = (ext_int_info_t *)
  47.                           kmalloc(sizeof(ext_int_info_t), GFP_ATOMIC);
  48.         if (p == NULL)
  49.                 return -ENOMEM;
  50.         p->code = code;
  51.         p->handler = handler;
  52.         p->next = ext_int_hash[index];
  53.         ext_int_hash[index] = p;
  54.         return 0;
  55. }
  57. int unregister_external_interrupt(__u16 code, ext_int_handler_t handler) {
  58.         ext_int_info_t *p, *q;
  59.         int index;
  61.         index = code & 0xff;
  62.         q = NULL;
  63.         p = ext_int_hash[index];
  64.         while (p != NULL) {
  65.                 if (p->code == code && p->handler == handler)
  66.                         break;
  67.                 q = p;
  68.                 p = p->next;
  69.         }
  70.         if (p == NULL)
  71.                 return -ENOENT;
  72.         if (q != NULL)
  73.                 q->next = p->next;
  74.         else
  75.                 ext_int_hash[index] = p->next;
  76.         if (code != 0x1004 && code != 0x2401 && code != 0x2603)
  77.                 kfree(p);
  78.         return 0;
  79. }
  81. EXPORT_SYMBOL(register_external_interrupt);
  82. EXPORT_SYMBOL(unregister_external_interrupt);