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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 <typedefs.h>
  40. #include <arch/types.h>
  41. #include <arch/stack.h>
  42. #include <config.h>
  43. #include <arch/interrupt.h>
  44.  
  45. /** No such instruction on ARM to sleep CPU. */
  46. static inline void cpu_sleep(void)
  47. {
  48. }
  49.  
  50. static inline void pio_write_8(ioport8_t *port, uint8_t v)
  51. {
  52.     *port = v;
  53. }
  54.  
  55. static inline void pio_write_16(ioport16_t *port, uint16_t v)
  56. {
  57.     *port = v;
  58. }
  59.  
  60. static inline void pio_write_32(ioport32_t *port, uint32_t v)
  61. {
  62.     *port = v;
  63. }
  64.  
  65. static inline uint8_t pio_read_8(ioport8_t *port)
  66. {
  67.     return *port;
  68. }
  69.  
  70. static inline uint16_t pio_read_16(ioport16_t *port)
  71. {
  72.     return *port;
  73. }
  74.  
  75. static inline uint32_t pio_read_32(ioport32_t *port)
  76. {
  77.     return *port;
  78. }
  79.  
  80. /** Return base address of current stack.
  81.  *
  82.  * Return the base address of the current stack.
  83.  * The stack is assumed to be STACK_SIZE bytes long.
  84.  * The stack must start on page boundary.
  85.  *
  86.  */
  87. static inline uintptr_t get_stack_base(void)
  88. {
  89.     uintptr_t v;
  90.     asm volatile (
  91.         "and %[v], sp, %[size]\n"
  92.         : [v] "=r" (v)
  93.         : [size] "r" (~(STACK_SIZE - 1))
  94.     );
  95.     return v;
  96. }
  97.  
  98. extern void cpu_halt(void);
  99. extern void asm_delay_loop(uint32_t t);
  100. extern void userspace_asm(uintptr_t ustack, uintptr_t uspace_uarg,
  101.     uintptr_t entry);
  102.  
  103. #endif
  104.  
  105. /** @}
  106.  */
  107.