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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 __ia32_ASM_H__
  30. #define __ia32_ASM_H__
  31.  
  32. #include <arch/types.h>
  33. #include <typedefs.h>
  34. #include <mm/page.h>
  35. #include <synch/spinlock.h>
  36.  
  37. extern __u32 interrupt_handler_size;
  38.  
  39. extern void paging_on(void);
  40.  
  41. extern void interrupt_handlers(void);
  42.  
  43. extern __u8 inb(int port);
  44. extern __u16 inw(int port);
  45. extern __u32 inl(int port);
  46.  
  47. extern void outb(int port, __u8 b);
  48. extern void outw(int port, __u16 w);
  49. extern void outl(int port, __u32 l);
  50.  
  51. extern void enable_l_apic_in_msr(void);
  52.  
  53. /** Halt CPU
  54.  *
  55.  * Halt the current CPU until interrupt event.
  56.  */
  57. static inline void cpu_halt(void) { __asm__("hlt"); };
  58. static inline void cpu_sleep(void) { __asm__("hlt"); };
  59.  
  60. /** Read CR2
  61.  *
  62.  * Return value in CR2
  63.  *
  64.  * @return Value read.
  65.  */
  66. static inline __u32 read_cr2(void) { __u32 v; __asm__ volatile ("movl %%cr2,%0" : "=r" (v)); return v; }
  67.  
  68. /** Write CR3
  69.  *
  70.  * Write value to CR3.
  71.  *
  72.  * @param v Value to be written.
  73.  */
  74. static inline void write_cr3(__u32 v) { __asm__ volatile ("movl %0,%%cr3\n" : : "r" (v)); }
  75.  
  76. /** Read CR3
  77.  *
  78.  * Return value in CR3
  79.  *
  80.  * @return Value read.
  81.  */
  82. static inline __u32 read_cr3(void) { __u32 v; __asm__ volatile ("movl %%cr3,%0" : "=r" (v)); return v; }
  83.  
  84. /** Write DR0
  85.  *
  86.  * Write value to DR0.
  87.  *
  88.  * @param v Value to be written.
  89.  */
  90. static inline void write_dr0(__u32 v) { __asm__ volatile ("movl %0,%%dr0\n" : : "r" (v)); }
  91.  
  92. /** Read DR0
  93.  *
  94.  * Return value in DR0
  95.  *
  96.  * @return Value read.
  97.  */
  98. static inline __u32 read_dr0(void) { __u32 v; __asm__ volatile ("movl %%dr0,%0" : "=r" (v)); return v; }
  99.  
  100. /** Set priority level low
  101.  *
  102.  * Enable interrupts and return previous
  103.  * value of EFLAGS.
  104.  */
  105. static inline pri_t cpu_priority_low(void) {
  106.     pri_t v;
  107.     __asm__ volatile (
  108.         "pushf\n"
  109.         "popl %0\n"
  110.         "sti\n"
  111.         : "=r" (v)
  112.     );
  113.     return v;
  114. }
  115.  
  116. /** Set priority level high
  117.  *
  118.  * Disable interrupts and return previous
  119.  * value of EFLAGS.
  120.  */
  121. static inline pri_t cpu_priority_high(void) {
  122.     pri_t v;
  123.     __asm__ volatile (
  124.         "pushf\n"
  125.         "popl %0\n"
  126.         "cli\n"
  127.         : "=r" (v)
  128.     );
  129.     return v;
  130. }
  131.  
  132. /** Restore priority level
  133.  *
  134.  * Restore EFLAGS.
  135.  */
  136. static inline void cpu_priority_restore(pri_t pri) {
  137.     __asm__ volatile (
  138.         "pushl %0\n"
  139.         "popf\n"
  140.         : : "r" (pri)
  141.     );
  142. }
  143.  
  144. /** Return raw priority level
  145.  *
  146.  * Return EFLAFS.
  147.  */
  148. static inline pri_t cpu_priority_read(void) {
  149.     pri_t v;
  150.     __asm__ volatile (
  151.         "pushf\n"
  152.         "popl %0\n"
  153.         : "=r" (v)
  154.     );
  155.     return v;
  156. }
  157.  
  158. #endif
  159.