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 save_flags(x) \
  21 __asm__ __volatile__("pushfl ; popl %0":"=r" (x))
  22 
  23 #define restore_flags(x) \
  24 __asm__ __volatile__("pushl %0 ; popfl"::"r" (x))
  25 
  26 #define iret() __asm__ __volatile__ ("iret"::)
  27 
  28 #define _set_gate(gate_addr,type,dpl,addr) \
  29 __asm__ __volatile__ ("movw %%dx,%%ax\n\t" \
  30         "movw %0,%%dx\n\t" \
  31         "movl %%eax,%1\n\t" \
  32         "movl %%edx,%2" \
  33         :: "i" ((short) (0x8000+(dpl<<13)+(type<<8))), \
  34         "m" (*((char *) (gate_addr))), \
  35         "m" (*(4+(char *) (gate_addr))), \
  36         "d" ((char *) (addr)),"a" (0x00080000) \
  37         :"ax","dx")
  38 
  39 #define set_intr_gate(n,addr) \
  40         _set_gate(&idt[n],14,0,addr)
  41 
  42 #define set_trap_gate(n,addr) \
  43         _set_gate(&idt[n],15,0,addr)
  44 
  45 #define set_system_gate(n,addr) \
  46         _set_gate(&idt[n],15,3,addr)
  47 
  48 #define _set_seg_desc(gate_addr,type,dpl,base,limit) {\
  49         *(gate_addr) = ((base) & 0xff000000) | \
  50                 (((base) & 0x00ff0000)>>16) | \
  51                 ((limit) & 0xf0000) | \
  52                 ((dpl)<<13) | \
  53                 (0x00408000) | \
  54                 ((type)<<8); \
  55         *((gate_addr)+1) = (((base) & 0x0000ffff)<<16) | \
  56                 ((limit) & 0x0ffff); }
  57 
  58 #define _set_tssldt_desc(n,addr,limit,type) \
  59 __asm__ __volatile__ ("movw $" #limit ",%1\n\t" \
  60         "movw %%ax,%2\n\t" \
  61         "rorl $16,%%eax\n\t" \
  62         "movb %%al,%3\n\t" \
  63         "movb $" type ",%4\n\t" \
  64         "movb $0x00,%5\n\t" \
  65         "movb %%ah,%6\n\t" \
  66         "rorl $16,%%eax" \
  67         ::"a" (addr+0xc0000000), "m" (*(n)), "m" (*(n+2)), "m" (*(n+4)), \
  68          "m" (*(n+5)), "m" (*(n+6)), "m" (*(n+7)) \
  69         )
  70 
  71 #define set_tss_desc(n,addr) _set_tssldt_desc(((char *) (n)),((int)(addr)),231,"0x89")
  72 #define set_ldt_desc(n,addr) _set_tssldt_desc(((char *) (n)),((int)(addr)),23,"0x82")
/* */
root/include/asm/system.h

INCLUDED FROM
