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  1. /*
  2.  * Copyright (C) 2005 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 __amd64_ASM_H__
  30. #define __amd64_ASM_H__
  31.  
  32. #include <arch/types.h>
  33. #include <config.h>
  34.  
  35.  
  36. void asm_delay_loop(__u32 t);
  37.  
  38. /* TODO: implement the real stuff */
  39. static inline __address get_stack_base(void)
  40. {
  41.     return NULL;
  42. }
  43.  
  44. static inline void cpu_sleep(void) { __asm__("hlt"); };
  45.  
  46.  
  47. static inline __u8 inb(__u16 port)
  48. {
  49.     __u8 out;
  50.  
  51.     asm (
  52.         "mov %0, %%dx;"
  53.         "inb %%dx,%%al;"
  54.         "mov %%al, %1;"
  55.         :"=m"(out)
  56.         :"m"(port)
  57.         :"dx","al"
  58.         );
  59.     return out;
  60. }
  61.  
  62. static inline __u8 outb(__u16 port,__u8 b)
  63. {
  64.     asm (
  65.         "mov %0,%%dx;"
  66.         "mov %1,%%al;"
  67.         "outb %%al,%%dx;"
  68.         :
  69.         :"m"( port), "m" (b)
  70.         :"dx","al"
  71.         );
  72. }
  73.  
  74. /** Set priority level low
  75.  *
  76.  * Enable interrupts and return previous
  77.  * value of EFLAGS.
  78.  */
  79. static inline pri_t cpu_priority_low(void) {
  80.     pri_t v;
  81.     __asm__ volatile (
  82.         "pushfq\n"
  83.         "popq %0\n"
  84.         "sti\n"
  85.         : "=r" (v)
  86.     );
  87.     return v;
  88. }
  89.  
  90. /** Set priority level high
  91.  *
  92.  * Disable interrupts and return previous
  93.  * value of EFLAGS.
  94.  */
  95. static inline pri_t cpu_priority_high(void) {
  96.     pri_t v;
  97.     __asm__ volatile (
  98.         "pushfq\n"
  99.         "popq %0\n"
  100.         "cli\n"
  101.         : "=r" (v)
  102.         );
  103.     return v;
  104. }
  105.  
  106. /** Restore priority level
  107.  *
  108.  * Restore EFLAGS.
  109.  */
  110. static inline void cpu_priority_restore(pri_t pri) {
  111.     __asm__ volatile (
  112.         "pushq %0\n"
  113.         "popfq\n"
  114.         : : "r" (pri)
  115.         );
  116. }
  117.  
  118.  
  119. #endif
  120.