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  1. /*
  2.  * Copyright (C) 2001-2004 Jakub Jermar
  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 __ARCH_H__
  30. #define __ARCH_H__
  31.  
  32. #include <arch/types.h>
  33. #include <typedefs.h>
  34.  
  35. #include <cpu.h>
  36. #include <arch/cpu.h>
  37. #include <arch/asm.h>
  38.  
  39. #include <proc/thread.h>
  40. #include <proc/task.h>
  41.  
  42. /*
  43.  * NOTE:
  44.  * CPU, THREAD and TASK are not preemption-safe.
  45.  * Provisions must be made to prevent preemption prior
  46.  * to using these macros. Simple cpu_priority_high()
  47.  * call will suffice.
  48.  */
  49. #define CPU     (&cpus[CPU_ID_ARCH])
  50. #define THREAD      (cpu_private_data[CPU_ID_ARCH].thread)
  51. #define TASK        (cpu_private_data[CPU_ID_ARCH].task)
  52.  
  53. /*
  54.  * For each possible kernel stack, structure
  55.  * of the following type will be placed at
  56.  * the bottom of the stack.
  57.  */
  58. struct the {
  59.     int preemption_disabled;
  60.     thread_t *thread;       /* current thread */
  61.     task_t *task;           /* current task */
  62.     cpu_t *cpu;         /* executing cpu */
  63. };
  64.  
  65. #define THE     ((the_t *)(get_stack_base()))  
  66.  
  67. extern void arch_pre_mm_init(void);
  68. extern void arch_post_mm_init(void);
  69. extern void arch_late_init(void);
  70. extern void calibrate_delay_loop(void);
  71.  
  72. extern pri_t cpu_priority_high(void);
  73. extern pri_t cpu_priority_low(void);
  74. extern void cpu_priority_restore(pri_t pri);
  75. extern pri_t cpu_priority_read(void);
  76.  
  77. #endif
  78.