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  1. /*
  2.  * Copyright (c) 2007 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.  *  @brief Declarations of functions implemented in assembly.
  34.  */
  35.  
  36. #ifndef KERN_arm32_ASM_H_
  37. #define KERN_arm32_ASM_H_
  38.  
  39. #include <arch/types.h>
  40. #include <arch/stack.h>
  41. #include <config.h>
  42. #include <arch/interrupt.h>
  43.  
  44. /** No such instruction on ARM to sleep CPU. */
  45. static inline void cpu_sleep(void)
  46. {
  47. }
  48.  
  49. /** Return base address of current stack.
  50.  *
  51.  * Return the base address of the current stack.
  52.  * The stack is assumed to be STACK_SIZE bytes long.
  53.  * The stack must start on page boundary.
  54.  */
  55. static inline uintptr_t get_stack_base(void)
  56. {
  57.     uintptr_t v;
  58.     asm volatile (
  59.         "and %0, sp, %1\n"
  60.         : "=r" (v)
  61.         : "r" (~(STACK_SIZE - 1))
  62.     );
  63.     return v;
  64. }
  65.  
  66. extern void cpu_halt(void);
  67. extern void asm_delay_loop(uint32_t t);
  68. extern void userspace_asm(uintptr_t ustack, uintptr_t uspace_uarg,
  69.     uintptr_t entry);
  70.  
  71. #endif
  72.  
  73. /** @}
  74.  */
  75.