include/asm/system.h

/* */
   1 #define move_to_user_mode() \
   2 __asm__ __volatile__ ("movl %%esp,%%eax\n\t" \
   3         "pushl $0x17\n\t" \
   4         "pushl %%eax\n\t" \
   5         "pushfl\n\t" \
   6         "pushl $0x0f\n\t" \
   7         "pushl $1f\n\t" \
   8         "iret\n" \
   9         "1:\tmovl $0x17,%%eax\n\t" \
  10         "mov %%ax,%%ds\n\t" \
  11         "mov %%ax,%%es\n\t" \
  12         "mov %%ax,%%fs\n\t" \
  13         "mov %%ax,%%gs" \
  14         :::"ax")
  15 
  16 #define sti() __asm__ __volatile__ ("sti"::)
  17 #define cli() __asm__ __volatile__ ("cli"::)
  18 #define nop() __asm__ __volatile__ ("nop"::)
  19 
  20 #define iret() __asm__ __volatile__ ("iret"::)
  21 
  22 #define _set_gate(gate_addr,type,dpl,addr) \
  23 __asm__ __volatile__ ("movw %%dx,%%ax\n\t" \
  24         "movw %0,%%dx\n\t" \
  25         "movl %%eax,%1\n\t" \
  26         "movl %%edx,%2" \
  27         :: "i" ((short) (0x8000+(dpl<<13)+(type<<8))), \
  28         "m" (*((char *) (gate_addr))), \
  29         "m" (*(4+(char *) (gate_addr))), \
  30         "d" ((char *) (addr)),"a" (0x00080000) \
  31         :"ax","dx")
  32 
  33 #define set_intr_gate(n,addr) \
  34         _set_gate(&idt[n],14,0,addr)
  35 
  36 #define set_trap_gate(n,addr) \
  37         _set_gate(&idt[n],15,0,addr)
  38 
  39 #define set_system_gate(n,addr) \
  40         _set_gate(&idt[n],15,3,addr)
  41 
  42 #define _set_seg_desc(gate_addr,type,dpl,base,limit) {\
  43         *(gate_addr) = ((base) & 0xff000000) | \
  44                 (((base) & 0x00ff0000)>>16) | \
  45                 ((limit) & 0xf0000) | \
  46                 ((dpl)<<13) | \
  47                 (0x00408000) | \
  48                 ((type)<<8); \
  49         *((gate_addr)+1) = (((base) & 0x0000ffff)<<16) | \
  50                 ((limit) & 0x0ffff); }
  51 
  52 #define _set_tssldt_desc(n,addr,type) \
  53 __asm__ __volatile__ ("movw $232,%1\n\t" \
  54         "movw %%ax,%2\n\t" \
  55         "rorl $16,%%eax\n\t" \
  56         "movb %%al,%3\n\t" \
  57         "movb $" type ",%4\n\t" \
  58         "movb $0x00,%5\n\t" \
  59         "movb %%ah,%6\n\t" \
  60         "rorl $16,%%eax" \
  61         ::"a" (addr), "m" (*(n)), "m" (*(n+2)), "m" (*(n+4)), \
  62          "m" (*(n+5)), "m" (*(n+6)), "m" (*(n+7)) \
  63         )
  64 
  65 #define set_tss_desc(n,addr) _set_tssldt_desc(((char *) (n)),addr,"0x89")
  66 #define set_ldt_desc(n,addr) _set_tssldt_desc(((char *) (n)),addr,"0x82")
/* */
root/include/asm/system.h

INCLUDED FROM
