root/include/asm/system.h

/* */

INCLUDED FROM

DEFINITIONS

1. tas

   1 #ifndef __ASM_SYSTEM_H
   2 #define __ASM_SYSTEM_H
   3 
   4 #define move_to_user_mode() \
   5 __asm__ __volatile__ ("movl %%esp,%%eax\n\t" \
   6         "pushl $0x17\n\t" \
   7         "pushl %%eax\n\t" \
   8         "pushfl\n\t" \
   9         "pushl $0x0f\n\t" \
  10         "pushl $1f\n\t" \
  11         "iret\n" \
  12         "1:\tmovl $0x17,%%eax\n\t" \
  13         "mov %%ax,%%ds\n\t" \
  14         "mov %%ax,%%es\n\t" \
  15         "mov %%ax,%%fs\n\t" \
  16         "mov %%ax,%%gs" \
  17         :::"ax")
  18 
  19 #define sti() __asm__ __volatile__ ("sti"::)
  20 #define cli() __asm__ __volatile__ ("cli"::)
  21 #define nop() __asm__ __volatile__ ("nop"::)
  22 
  23 extern inline int tas(char * m)
     /*  */
  24 {
  25         char res;
  26 
  27         __asm__("xchgb %0,%1":"=q" (res),"=m" (*m):"0" (0x1));
  28         return res;
  29 }
  30 
  31 #define save_flags(x) \
  32 __asm__ __volatile__("pushfl ; popl %0":"=r" (x))
  33 
  34 #define restore_flags(x) \
  35 __asm__ __volatile__("pushl %0 ; popfl"::"r" (x))
  36 
  37 #define iret() __asm__ __volatile__ ("iret"::)
  38 
  39 #define _set_gate(gate_addr,type,dpl,addr) \
  40 __asm__ __volatile__ ("movw %%dx,%%ax\n\t" \
  41         "movw %0,%%dx\n\t" \
  42         "movl %%eax,%1\n\t" \
  43         "movl %%edx,%2" \
  44         :: "i" ((short) (0x8000+(dpl<<13)+(type<<8))), \
  45         "m" (*((char *) (gate_addr))), \
  46         "m" (*(4+(char *) (gate_addr))), \
  47         "d" ((char *) (addr)),"a" (0x00080000) \
  48         :"ax","dx")
  49 
  50 #define set_intr_gate(n,addr) \
  51         _set_gate(&idt[n],14,0,addr)
  52 
  53 #define set_trap_gate(n,addr) \
  54         _set_gate(&idt[n],15,0,addr)
  55 
  56 #define set_system_gate(n,addr) \
  57         _set_gate(&idt[n],15,3,addr)
  58 
  59 #define _set_seg_desc(gate_addr,type,dpl,base,limit) {\
  60         *(gate_addr) = ((base) & 0xff000000) | \
  61                 (((base) & 0x00ff0000)>>16) | \
  62                 ((limit) & 0xf0000) | \
  63                 ((dpl)<<13) | \
  64                 (0x00408000) | \
  65                 ((type)<<8); \
  66         *((gate_addr)+1) = (((base) & 0x0000ffff)<<16) | \
  67                 ((limit) & 0x0ffff); }
  68 
  69 #define _set_tssldt_desc(n,addr,limit,type) \
  70 __asm__ __volatile__ ("movw $" #limit ",%1\n\t" \
  71         "movw %%ax,%2\n\t" \
  72         "rorl $16,%%eax\n\t" \
  73         "movb %%al,%3\n\t" \
  74         "movb $" type ",%4\n\t" \
  75         "movb $0x00,%5\n\t" \
  76         "movb %%ah,%6\n\t" \
  77         "rorl $16,%%eax" \
  78         ::"a" (addr+0xc0000000), "m" (*(n)), "m" (*(n+2)), "m" (*(n+4)), \
  79          "m" (*(n+5)), "m" (*(n+6)), "m" (*(n+7)) \
  80         )
  81 
  82 #define set_tss_desc(n,addr) _set_tssldt_desc(((char *) (n)),((int)(addr)),231,"0x89")
  83 #define set_ldt_desc(n,addr) _set_tssldt_desc(((char *) (n)),((int)(addr)),23,"0x82")
  84 
  85 #endif

/* */