Subversion Repositories HelenOS-historic

Rev

Rev 254 | Rev 413 | Go to most recent revision | Blame | Compare with Previous | Last modification | View Log | Download | RSS feed

  1. /*
  2.  * Copyright (C) 2005 Martin Decky
  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. #ifndef __ppc32_ASM_H__
  30. #define __ppc32_ASM_H__
  31.  
  32. #include <arch/types.h>
  33. #include <config.h>
  34.  
  35. /** Set priority level low
  36.  *
  37.  * Enable interrupts and return previous
  38.  * value of EE.
  39.  */
  40. static inline pri_t cpu_priority_low(void) {
  41.     pri_t v;
  42.     pri_t tmp;
  43.    
  44.     __asm__ volatile (
  45.         "mfmsr %0\n"
  46.         "mfmsr %1\n"
  47.         "ori %1, %1, 1 << 15\n"
  48.         "mtmsr %1\n"
  49.         : "=r" (v), "=r" (tmp)
  50.     );
  51.     return v;
  52. }
  53.  
  54. /** Set priority level high
  55.  *
  56.  * Disable interrupts and return previous
  57.  * value of EE.
  58.  */
  59. static inline pri_t cpu_priority_high(void) {
  60.     pri_t v;
  61.     pri_t tmp;
  62.    
  63.     __asm__ volatile (
  64.         "mfmsr %0\n"
  65.         "mfmsr %1\n"
  66.         "rlwinm %1, %1, 0, 17, 15\n"
  67.         "mtmsr %1\n"
  68.         : "=r" (v), "=r" (tmp)
  69.     );
  70.     return v;
  71. }
  72.  
  73. /** Restore priority level
  74.  *
  75.  * Restore EE.
  76.  */
  77. static inline void cpu_priority_restore(pri_t pri) {
  78.     pri_t tmp;
  79.    
  80.     __asm__ volatile (
  81.         "mfmsr %1\n"
  82.         "rlwimi  %0, %1, 0, 17, 15\n"
  83.         "cmpw 0, %0, %1\n"
  84.         "beq 0f\n"
  85.         "mtmsr %0\n"
  86.         "0:\n"
  87.         : "=r" (pri), "=r" (tmp)
  88.         : "0" (pri)
  89.     );
  90. }
  91.  
  92. /** Return raw priority level
  93.  *
  94.  * Return EE.
  95.  */
  96. static inline pri_t cpu_priority_read(void) {
  97.     pri_t v;
  98.     __asm__ volatile (
  99.         "mfmsr %0\n"
  100.         : "=r" (v)
  101.     );
  102.     return v;
  103. }
  104.  
  105. /** Return base address of current stack.
  106.  *
  107.  * Return the base address of the current stack.
  108.  * The stack is assumed to be STACK_SIZE bytes long.
  109.  * The stack must start on page boundary.
  110.  */
  111. static inline __address get_stack_base(void)
  112. {
  113.     __address v;
  114.    
  115.     __asm__ volatile ("and %0, %%r1, %1\n" : "=r" (v) : "r" (~(STACK_SIZE-1)));
  116.    
  117.     return v;
  118. }
  119.  
  120. void cpu_halt(void);
  121. void cpu_sleep(void);
  122. void asm_delay_loop(__u32 t);
  123.  
  124. #endif
  125.