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  1. /*
  2.  * Copyright (c) 2007 Petr Stepan
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. /** @addtogroup arm32
  30.  * @{
  31.  */
  32. /** @file
  33.  */
  34.  
  35. #include<arch/asm.h>
  36. #include<arch/regutils.h>
  37.  
  38.  
  39. /** Disable interrupts.
  40.  *
  41.  * @return Old interrupt priority level.
  42.  */
  43. ipl_t interrupts_disable(void)
  44. {
  45.     ipl_t ipl = current_status_reg_read();
  46.  
  47.     current_status_reg_control_write(ipl & ~STATUS_REG_IE_ENABLED_BIT);
  48.    
  49.     return ipl;
  50. }
  51.  
  52. /** Enable interrupts.
  53.  *
  54.  * @return Old interrupt priority level.
  55.  */
  56. ipl_t interrupts_enable(void)
  57. {
  58.     ipl_t ipl = current_status_reg_read();
  59.  
  60.     current_status_reg_control_write(ipl | STATUS_REG_IE_ENABLED_BIT);
  61.  
  62.     return ipl;
  63. }
  64.  
  65. /** Restore interrupt priority level.
  66.  *
  67.  * @param ipl Saved interrupt priority level.
  68.  */
  69. void interrupts_restore(ipl_t ipl)
  70. {
  71.     current_status_reg_control_write(current_status_reg_read() |
  72.             (ipl & STATUS_REG_IE_ENABLED_BIT));
  73. }
  74.  
  75. /** Read interrupt priority level.
  76.  *
  77.  * @return Current interrupt priority level.
  78.  */
  79. ipl_t interrupts_read(void)
  80. {
  81.     return current_status_reg_read();
  82. }
  83.  
  84. /** @}
  85.  */
  86.