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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 <config.h>
  34.  
  35. extern __u32 interrupt_handler_size;
  36.  
  37. extern void paging_on(void);
  38.  
  39. extern void interrupt_handlers(void);
  40.  
  41. extern void enable_l_apic_in_msr(void);
  42.  
  43.  
  44. void asm_delay_loop(__u32 t);
  45. void asm_fake_loop(__u32 t);
  46.  
  47.  
  48. /** Halt CPU
  49.  *
  50.  * Halt the current CPU until interrupt event.
  51.  */
  52. static inline void cpu_halt(void) { __asm__("hlt\n"); };
  53. static inline void cpu_sleep(void) { __asm__("hlt\n"); };
  54.  
  55. /** Read CR2
  56.  *
  57.  * Return value in CR2
  58.  *
  59.  * @return Value read.
  60.  */
  61. static inline __u32 read_cr2(void) { __u32 v; __asm__ volatile ("movl %%cr2,%0\n" : "=r" (v)); return v; }
  62.  
  63. /** Write CR3
  64.  *
  65.  * Write value to CR3.
  66.  *
  67.  * @param v Value to be written.
  68.  */
  69. static inline void write_cr3(__u32 v) { __asm__ volatile ("movl %0,%%cr3\n" : : "r" (v)); }
  70.  
  71. /** Read CR3
  72.  *
  73.  * Return value in CR3
  74.  *
  75.  * @return Value read.
  76.  */
  77. static inline __u32 read_cr3(void) { __u32 v; __asm__ volatile ("movl %%cr3,%0\n" : "=r" (v)); return v; }
  78.  
  79. /** Byte to port
  80.  *
  81.  * Output byte to port
  82.  *
  83.  * @param port Port to write to
  84.  * @param val Value to write
  85.  */
  86. static inline void outb(__u16 port, __u8 val) { __asm__ volatile ("outb %b0, %w1\n" : : "a" (val), "d" (port) ); }
  87.  
  88. /** Word to port
  89.  *
  90.  * Output word to port
  91.  *
  92.  * @param port Port to write to
  93.  * @param val Value to write
  94.  */
  95. static inline void outw(__u16 port, __u16 val) { __asm__ volatile ("outw %w0, %w1\n" : : "a" (val), "d" (port) ); }
  96.  
  97. /** Double word to port
  98.  *
  99.  * Output double word to port
  100.  *
  101.  * @param port Port to write to
  102.  * @param val Value to write
  103.  */
  104. static inline void outl(__u16 port, __u32 val) { __asm__ volatile ("outl %l0, %w1\n" : : "a" (val), "d" (port) ); }
  105.  
  106. /** Byte from port
  107.  *
  108.  * Get byte from port
  109.  *
  110.  * @param port Port to read from
  111.  * @return Value read
  112.  */
  113. static inline __u8 inb(__u16 port) { __u8 val; __asm__ volatile ("inb %w1, %b0 \n" : "=a" (val) : "d" (port) ); return val; }
  114.  
  115. /** Word from port
  116.  *
  117.  * Get word from port
  118.  *
  119.  * @param port Port to read from
  120.  * @return Value read
  121.  */
  122. static inline __u16 inw(__u16 port) { __u16 val; __asm__ volatile ("inw %w1, %w0 \n" : "=a" (val) : "d" (port) ); return val; }
  123.  
  124. /** Double word from port
  125.  *
  126.  * Get double word from port
  127.  *
  128.  * @param port Port to read from
  129.  * @return Value read
  130.  */
  131. static inline __u32 inl(__u16 port) { __u32 val; __asm__ volatile ("inl %w1, %l0 \n" : "=a" (val) : "d" (port) ); return val; }
  132.  
  133. /** Set priority level low
  134.  *
  135.  * Enable interrupts and return previous
  136.  * value of EFLAGS.
  137.  */
  138. static inline pri_t cpu_priority_low(void) {
  139.     pri_t v;
  140.     __asm__ volatile (
  141.         "pushf\n"
  142.         "popl %0\n"
  143.         "sti\n"
  144.         : "=r" (v)
  145.     );
  146.     return v;
  147. }
  148.  
  149. /** Set priority level high
  150.  *
  151.  * Disable interrupts and return previous
  152.  * value of EFLAGS.
  153.  */
  154. static inline pri_t cpu_priority_high(void) {
  155.     pri_t v;
  156.     __asm__ volatile (
  157.         "pushf\n"
  158.         "popl %0\n"
  159.         "cli\n"
  160.         : "=r" (v)
  161.     );
  162.     return v;
  163. }
  164.  
  165. /** Restore priority level
  166.  *
  167.  * Restore EFLAGS.
  168.  */
  169. static inline void cpu_priority_restore(pri_t pri) {
  170.     __asm__ volatile (
  171.         "pushl %0\n"
  172.         "popf\n"
  173.         : : "r" (pri)
  174.     );
  175. }
  176.  
  177. /** Return raw priority level
  178.  *
  179.  * Return EFLAFS.
  180.  */
  181. static inline pri_t cpu_priority_read(void) {
  182.     pri_t v;
  183.     __asm__ volatile (
  184.         "pushf\n"
  185.         "popl %0\n"
  186.         : "=r" (v)
  187.     );
  188.     return v;
  189. }
  190.  
  191. /** Return base address of current stack
  192.  *
  193.  * Return the base address of the current stack.
  194.  * The stack is assumed to be STACK_SIZE bytes long.
  195.  * The stack must start on page boundary.
  196.  */
  197. static inline __address get_stack_base(void)
  198. {
  199.     __address v;
  200.    
  201.     __asm__ volatile ("andl %%esp, %0\n" : "=r" (v) : "0" (~(STACK_SIZE-1)));
  202.    
  203.     return v;
  204. }
  205.  
  206. static inline __u64 rdtsc(void)
  207. {
  208.     __u64 v;
  209.    
  210.     __asm__ volatile("rdtsc\n" : "=A" (v));
  211.    
  212.     return v;
  213. }
  214.  
  215.  
  216. #endif
  217.