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  1. /*
  2.  * Copyright (C) 2001-2004 Jakub Jermar
  3.  * Copyright (C) 2005 Sergey Bondari
  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. /** Enable interrupts.
  135.  *
  136.  * Enable interrupts and return previous
  137.  * value of EFLAGS.
  138.  *
  139.  * @return Old interrupt priority level.
  140.  */
  141. static inline ipl_t interrupts_enable(void)
  142. {
  143.     ipl_t v;
  144.     __asm__ volatile (
  145.         "pushf\n\t"
  146.         "popl %0\n\t"
  147.         "sti\n"
  148.         : "=r" (v)
  149.     );
  150.     return v;
  151. }
  152.  
  153. /** Disable interrupts.
  154.  *
  155.  * Disable interrupts and return previous
  156.  * value of EFLAGS.
  157.  *
  158.  * @return Old interrupt priority level.
  159.  */
  160. static inline ipl_t interrupts_disable(void)
  161. {
  162.     ipl_t v;
  163.     __asm__ volatile (
  164.         "pushf\n\t"
  165.         "popl %0\n\t"
  166.         "cli\n"
  167.         : "=r" (v)
  168.     );
  169.     return v;
  170. }
  171.  
  172. /** Restore interrupt priority level.
  173.  *
  174.  * Restore EFLAGS.
  175.  *
  176.  * @param ipl Saved interrupt priority level.
  177.  */
  178. static inline void interrupts_restore(ipl_t ipl)
  179. {
  180.     __asm__ volatile (
  181.         "pushl %0\n\t"
  182.         "popf\n"
  183.         : : "r" (ipl)
  184.     );
  185. }
  186.  
  187. /** Return interrupt priority level.
  188.  *
  189.  * @return EFLAFS.
  190.  */
  191. static inline ipl_t interrupts_read(void)
  192. {
  193.     ipl_t v;
  194.     __asm__ volatile (
  195.         "pushf\n\t"
  196.         "popl %0\n"
  197.         : "=r" (v)
  198.     );
  199.     return v;
  200. }
  201.  
  202. /** Return base address of current stack
  203.  *
  204.  * Return the base address of the current stack.
  205.  * The stack is assumed to be STACK_SIZE bytes long.
  206.  * The stack must start on page boundary.
  207.  */
  208. static inline __address get_stack_base(void)
  209. {
  210.     __address v;
  211.    
  212.     __asm__ volatile ("andl %%esp, %0\n" : "=r" (v) : "0" (~(STACK_SIZE-1)));
  213.    
  214.     return v;
  215. }
  216.  
  217. static inline __u64 rdtsc(void)
  218. {
  219.     __u64 v;
  220.    
  221.     __asm__ volatile("rdtsc\n" : "=A" (v));
  222.    
  223.     return v;
  224. }
  225.  
  226. #endif
  227.