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  1. /*
  2.  * Copyright (C) 2001-2004 Jakub Jermar
  3.  * Copyright (C) 2005 HelenOS project
  4.  * All rights reserved.
  5.  *
  6.  * Redistribution and use in source and binary forms, with or without
  7.  * modification, are permitted provided that the following conditions
  8.  * are met:
  9.  *
  10.  * - Redistributions of source code must retain the above copyright
  11.  *   notice, this list of conditions and the following disclaimer.
  12.  * - Redistributions in binary form must reproduce the above copyright
  13.  *   notice, this list of conditions and the following disclaimer in the
  14.  *   documentation and/or other materials provided with the distribution.
  15.  * - The name of the author may not be used to endorse or promote products
  16.  *   derived from this software without specific prior written permission.
  17.  *
  18.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  19.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  20.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  21.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  22.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  23.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  24.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  25.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  26.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  27.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28.  */
  29.  
  30. #ifndef __ia32_ASM_H__
  31. #define __ia32_ASM_H__
  32.  
  33. #include <arch/types.h>
  34. #include <config.h>
  35.  
  36. extern __u32 interrupt_handler_size;
  37.  
  38. extern void paging_on(void);
  39.  
  40. extern void interrupt_handlers(void);
  41.  
  42. extern void enable_l_apic_in_msr(void);
  43.  
  44.  
  45. void asm_delay_loop(__u32 t);
  46. void asm_fake_loop(__u32 t);
  47.  
  48.  
  49. /** Halt CPU
  50.  *
  51.  * Halt the current CPU until interrupt event.
  52.  */
  53. static inline void cpu_halt(void) { __asm__("hlt\n"); };
  54. static inline void cpu_sleep(void) { __asm__("hlt\n"); };
  55.  
  56. /** Read CR2
  57.  *
  58.  * Return value in CR2
  59.  *
  60.  * @return Value read.
  61.  */
  62. static inline __u32 read_cr2(void) { __u32 v; __asm__ volatile ("movl %%cr2,%0\n" : "=r" (v)); return v; }
  63.  
  64. /** Write CR3
  65.  *
  66.  * Write value to CR3.
  67.  *
  68.  * @param v Value to be written.
  69.  */
  70. static inline void write_cr3(__u32 v) { __asm__ volatile ("movl %0,%%cr3\n" : : "r" (v)); }
  71.  
  72. /** Read CR3
  73.  *
  74.  * Return value in CR3
  75.  *
  76.  * @return Value read.
  77.  */
  78. static inline __u32 read_cr3(void) { __u32 v; __asm__ volatile ("movl %%cr3,%0\n" : "=r" (v)); return v; }
  79.  
  80. /** Byte to port
  81.  *
  82.  * Output byte to port
  83.  *
  84.  * @param port Port to write to
  85.  * @param val Value to write
  86.  */
  87. static inline void outb(__u16 port, __u8 val) { __asm__ volatile ("outb %b0, %w1\n" : : "a" (val), "d" (port) ); }
  88.  
  89. /** Word to port
  90.  *
  91.  * Output word to port
  92.  *
  93.  * @param port Port to write to
  94.  * @param val Value to write
  95.  */
  96. static inline void outw(__u16 port, __u16 val) { __asm__ volatile ("outw %w0, %w1\n" : : "a" (val), "d" (port) ); }
  97.  
  98. /** Double word to port
  99.  *
  100.  * Output double word to port
  101.  *
  102.  * @param port Port to write to
  103.  * @param val Value to write
  104.  */
  105. static inline void outl(__u16 port, __u32 val) { __asm__ volatile ("outl %l0, %w1\n" : : "a" (val), "d" (port) ); }
  106.  
  107. /** Byte from port
  108.  *
  109.  * Get byte from port
  110.  *
  111.  * @param port Port to read from
  112.  * @return Value read
  113.  */
  114. static inline __u8 inb(__u16 port) { __u8 val; __asm__ volatile ("inb %w1, %b0 \n" : "=a" (val) : "d" (port) ); return val; }
  115.  
  116. /** Word from port
  117.  *
  118.  * Get word from port
  119.  *
  120.  * @param port Port to read from
  121.  * @return Value read
  122.  */
  123. static inline __u16 inw(__u16 port) { __u16 val; __asm__ volatile ("inw %w1, %w0 \n" : "=a" (val) : "d" (port) ); return val; }
  124.  
  125. /** Double word from port
  126.  *
  127.  * Get double word from port
  128.  *
  129.  * @param port Port to read from
  130.  * @return Value read
  131.  */
  132. static inline __u32 inl(__u16 port) { __u32 val; __asm__ volatile ("inl %w1, %l0 \n" : "=a" (val) : "d" (port) ); return val; }
  133.  
  134. /** Set priority level low
  135.  *
  136.  * Enable interrupts and return previous
  137.  * value of EFLAGS.
  138.  */
  139. static inline pri_t cpu_priority_low(void) {
  140.     pri_t v;
  141.     __asm__ volatile (
  142.         "pushf\n\t"
  143.         "popl %0\n\t"
  144.         "sti\n"
  145.         : "=r" (v)
  146.     );
  147.     return v;
  148. }
  149.  
  150. /** Set priority level high
  151.  *
  152.  * Disable interrupts and return previous
  153.  * value of EFLAGS.
  154.  */
  155. static inline pri_t cpu_priority_high(void) {
  156.     pri_t v;
  157.     __asm__ volatile (
  158.         "pushf\n\t"
  159.         "popl %0\n\t"
  160.         "cli\n"
  161.         : "=r" (v)
  162.     );
  163.     return v;
  164. }
  165.  
  166. /** Restore priority level
  167.  *
  168.  * Restore EFLAGS.
  169.  */
  170. static inline void cpu_priority_restore(pri_t pri) {
  171.     __asm__ volatile (
  172.         "pushl %0\n\t"
  173.         "popf\n"
  174.         : : "r" (pri)
  175.     );
  176. }
  177.  
  178. /** Return raw priority level
  179.  *
  180.  * Return EFLAFS.
  181.  */
  182. static inline pri_t cpu_priority_read(void) {
  183.     pri_t v;
  184.     __asm__ volatile (
  185.         "pushf\n\t"
  186.         "popl %0\n"
  187.         : "=r" (v)
  188.     );
  189.     return v;
  190. }
  191.  
  192. /** Return base address of current stack
  193.  *
  194.  * Return the base address of the current stack.
  195.  * The stack is assumed to be STACK_SIZE bytes long.
  196.  * The stack must start on page boundary.
  197.  */
  198. static inline __address get_stack_base(void)
  199. {
  200.     __address v;
  201.    
  202.     __asm__ volatile ("andl %%esp, %0\n" : "=r" (v) : "0" (~(STACK_SIZE-1)));
  203.    
  204.     return v;
  205. }
  206.  
  207. static inline __u64 rdtsc(void)
  208. {
  209.     __u64 v;
  210.    
  211.     __asm__ volatile("rdtsc\n" : "=A" (v));
  212.    
  213.     return v;
  214. }
  215.  
  216. #endif
  217.