user/iotable.c

   1 /*
   2  * Kernel-based Virtual Machine test driver
   3  *
   4  * This test driver provides a simple way of testing kvm, without a full
   5  * device model.
   6  *
   7  * Copyright (C) 2006 Qumranet
   8  *
   9  * Authors:
  10  *
  11  *  Avi Kivity <avi@qumranet.com>
  12  *  Yaniv Kamay <yaniv@qumranet.com>
  13  *
  14  * This work is licensed under the GNU LGPL license, version 2.
  15  */
  16
  17 #include <stdlib.h>
  18 #include <stdint.h>
  19 #include <errno.h>
  20
  21 #include "iotable.h"
  22
  23 struct io_table_entry *io_table_lookup(struct io_table *io_table, uint64_t addr)
  24 {
  25         int i;
  26
  27         for (i = 0; i < io_table->nr_entries; i++) {
  28                 if (io_table->entries[i].start <= addr &&
  29                     addr < io_table->entries[i].end)
  30                         return &io_table->entries[i];
  31         }
  32
  33         return NULL;
  34 }
  35
  36 int io_table_register(struct io_table *io_table, uint64_t start, uint64_t size,
  37                       io_table_handler_t *handler, void *opaque)
  38 {
  39         struct io_table_entry *entry;
  40
  41         if (io_table->nr_entries == MAX_IO_TABLE)
  42                 return -ENOSPC;
  43
  44         entry = &io_table->entries[io_table->nr_entries];
  45         io_table->nr_entries++;
  46
  47         entry->start = start;
  48         entry->end = start + size;
  49         entry->handler = handler;
  50         entry->opaque = opaque;
  51
  52         return 0;
  53 }