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  1. /*
  2.  * Copyright (c) 2007 Petr Stepan, Michal Kebrt
  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. #include <interrupt.h>
  38.  
  39.  
  40. #define IRQ_COUNT   8
  41.  
  42.  
  43. /** Disable interrupts.
  44.  *
  45.  * @return Old interrupt priority level.
  46.  */
  47. ipl_t interrupts_disable(void)
  48. {
  49.     ipl_t ipl = current_status_reg_read();
  50.  
  51.     current_status_reg_control_write(ipl & ~STATUS_REG_IE_ENABLED_BIT);
  52.    
  53.     return ipl;
  54. }
  55.  
  56. /** Enable interrupts.
  57.  *
  58.  * @return Old interrupt priority level.
  59.  */
  60. ipl_t interrupts_enable(void)
  61. {
  62.     ipl_t ipl = current_status_reg_read();
  63.  
  64.     current_status_reg_control_write(ipl | STATUS_REG_IE_ENABLED_BIT);
  65.  
  66.     return ipl;
  67. }
  68.  
  69. /** Restore interrupt priority level.
  70.  *
  71.  * @param ipl Saved interrupt priority level.
  72.  */
  73. void interrupts_restore(ipl_t ipl)
  74. {
  75.     current_status_reg_control_write(current_status_reg_read() |
  76.             (ipl & STATUS_REG_IE_ENABLED_BIT));
  77. }
  78.  
  79. /** Read interrupt priority level.
  80.  *
  81.  * @return Current interrupt priority level.
  82.  */
  83. ipl_t interrupts_read(void)
  84. {
  85.     return current_status_reg_read();
  86. }
  87.  
  88. void interrupt_init(void) {
  89.     irq_init(IRQ_COUNT, IRQ_COUNT);
  90. }
  91.  
  92. /** @}
  93.  */
  94.