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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. void asm_fake_loop(__u32 t);
  38.  
  39.  
  40. /* TODO: implement the real stuff */
  41. static inline __address get_stack_base(void)
  42. {
  43.     return NULL;
  44. }
  45.  
  46. static inline void cpu_sleep(void) { __asm__("hlt"); };
  47.  
  48.  
  49. static inline __u8 inb(__u16 port)
  50. {
  51.     __u8 out;
  52.  
  53.     asm (
  54.         "mov %0, %%dx;"
  55.         "inb %%dx,%%al;"
  56.         "mov %%al, %1;"
  57.         :"=m"(out)
  58.         :"m"(port)
  59.         :"%dx","%al"
  60.         );
  61.     return out;
  62. }
  63.  
  64. static inline __u8 outb(__u16 port,__u8 b)
  65. {
  66.     asm (
  67.         "mov %0,%%dx;"
  68.         "mov %1,%%al;"
  69.         "outb %%al,%%dx;"
  70.         :
  71.         :"m"( port), "m" (b)
  72.         :"%dx","%al"
  73.         );
  74. }
  75.  
  76. /** Set priority level low
  77.  *
  78.  * Enable interrupts and return previous
  79.  * value of EFLAGS.
  80.  */
  81. static inline pri_t cpu_priority_low(void) {
  82.     pri_t v;
  83.     __asm__ volatile (
  84.         "pushfq\n"
  85.         "popq %0\n"
  86.         "sti\n"
  87.         : "=r" (v)
  88.     );
  89.     return v;
  90. }
  91.  
  92. /** Set priority level high
  93.  *
  94.  * Disable interrupts and return previous
  95.  * value of EFLAGS.
  96.  */
  97. static inline pri_t cpu_priority_high(void) {
  98.     pri_t v;
  99.     __asm__ volatile (
  100.         "pushfq\n"
  101.         "popq %0\n"
  102.         "cli\n"
  103.         : "=r" (v)
  104.         );
  105.     return v;
  106. }
  107.  
  108. /** Restore priority level
  109.  *
  110.  * Restore EFLAGS.
  111.  */
  112. static inline void cpu_priority_restore(pri_t pri) {
  113.     __asm__ volatile (
  114.         "pushq %0\n"
  115.         "popfq\n"
  116.         : : "r" (pri)
  117.         );
  118. }
  119.  
  120. /** Return raw priority level
  121.  *
  122.  * Return EFLAFS.
  123.  */
  124. static inline pri_t cpu_priority_read(void) {
  125.     pri_t v;
  126.     __asm__ volatile (
  127.         "pushfq\n"
  128.         "popq %0\n"
  129.         : "=r" (v)
  130.     );
  131.     return v;
  132. }
  133.  
  134. extern size_t interrupt_handler_size;
  135. extern void interrupt_handlers(void);
  136.  
  137. #endif
  138.