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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 <config.h>
  35. #include <synch/spinlock.h>
  36. #include <arch/boot/memmap.h>
  37. #include <config.h>
  38.  
  39. extern __u32 interrupt_handler_size;
  40.  
  41. extern void paging_on(void);
  42.  
  43. extern void interrupt_handlers(void);
  44.  
  45. extern __u8 inb(int port);
  46. extern __u16 inw(int port);
  47. extern __u32 inl(int port);
  48.  
  49. extern void outb(int port, __u8 b);
  50. extern void outw(int port, __u16 w);
  51. extern void outl(int port, __u32 l);
  52.  
  53. extern void enable_l_apic_in_msr(void);
  54.  
  55. /** Halt CPU
  56.  *
  57.  * Halt the current CPU until interrupt event.
  58.  */
  59. static inline void cpu_halt(void) { __asm__("hlt"); };
  60. static inline void cpu_sleep(void) { __asm__("hlt"); };
  61.  
  62. /** Read CR2
  63.  *
  64.  * Return value in CR2
  65.  *
  66.  * @return Value read.
  67.  */
  68. static inline __u32 read_cr2(void) { __u32 v; __asm__ volatile ("movl %%cr2,%0" : "=r" (v)); return v; }
  69.  
  70. /** Write CR3
  71.  *
  72.  * Write value to CR3.
  73.  *
  74.  * @param v Value to be written.
  75.  */
  76. static inline void write_cr3(__u32 v) { __asm__ volatile ("movl %0,%%cr3\n" : : "r" (v)); }
  77.  
  78. /** Read CR3
  79.  *
  80.  * Return value in CR3
  81.  *
  82.  * @return Value read.
  83.  */
  84. static inline __u32 read_cr3(void) { __u32 v; __asm__ volatile ("movl %%cr3,%0" : "=r" (v)); return v; }
  85.  
  86. /** Set priority level low
  87.  *
  88.  * Enable interrupts and return previous
  89.  * value of EFLAGS.
  90.  */
  91. static inline pri_t cpu_priority_low(void) {
  92.     pri_t v;
  93.     __asm__ volatile (
  94.         "pushf\n"
  95.         "popl %0\n"
  96.         "sti\n"
  97.         : "=r" (v)
  98.     );
  99.     return v;
  100. }
  101.  
  102. /** Set priority level high
  103.  *
  104.  * Disable interrupts and return previous
  105.  * value of EFLAGS.
  106.  */
  107. static inline pri_t cpu_priority_high(void) {
  108.     pri_t v;
  109.     __asm__ volatile (
  110.         "pushf\n"
  111.         "popl %0\n"
  112.         "cli\n"
  113.         : "=r" (v)
  114.     );
  115.     return v;
  116. }
  117.  
  118. /** Restore priority level
  119.  *
  120.  * Restore EFLAGS.
  121.  */
  122. static inline void cpu_priority_restore(pri_t pri) {
  123.     __asm__ volatile (
  124.         "pushl %0\n"
  125.         "popf\n"
  126.         : : "r" (pri)
  127.     );
  128. }
  129.  
  130. /** Return raw priority level
  131.  *
  132.  * Return EFLAFS.
  133.  */
  134. static inline pri_t cpu_priority_read(void) {
  135.     pri_t v;
  136.     __asm__ volatile (
  137.         "pushf\n"
  138.         "popl %0\n"
  139.         : "=r" (v)
  140.     );
  141.     return v;
  142. }
  143.  
  144. /** Return base address of current stack
  145.  *
  146.  * Return the base address of the current stack.
  147.  * The stack is assumed to be STACK_SIZE bytes long.
  148.  * The stack must start on page boundary.
  149.  */
  150. static inline __address get_stack_base(void)
  151. {
  152.     __address v;
  153.    
  154.     __asm__ volatile ("andl %%esp, %0\n" : "=r" (v) : "0" (~(STACK_SIZE-1)));
  155.    
  156.     return v;
  157. }
  158.  
  159. #endif
  160.