root/include/asm/system.h

/* */

INCLUDED FROM

DEFINITIONS

1. tas

   1 #ifndef __ASM_SYSTEM_H
   2 #define __ASM_SYSTEM_H
   3 
   4 #include <linux/segment.h>
   5 
   6 #define move_to_user_mode() \
   7 __asm__ __volatile__ ("movl %%esp,%%eax\n\t" \
   8         "pushl %0\n\t" \
   9         "pushl %%eax\n\t" \
  10         "pushfl\n\t" \
  11         "pushl %1\n\t" \
  12         "pushl $1f\n\t" \
  13         "iret\n" \
  14         "1:\tmovl %0,%%eax\n\t" \
  15         "mov %%ax,%%ds\n\t" \
  16         "mov %%ax,%%es\n\t" \
  17         "mov %%ax,%%fs\n\t" \
  18         "mov %%ax,%%gs" \
  19         ::"i" (USER_DS), "i" (USER_CS):"ax")
  20 
  21 #define sti() __asm__ __volatile__ ("sti":::"memory")
  22 #define cli() __asm__ __volatile__ ("cli":::"memory")
  23 #define nop() __asm__ __volatile__ ("nop"::)
  24 
  25 extern inline int tas(char * m)
     /*  */
  26 {
  27         char res;
  28 
  29         __asm__("xchgb %0,%1":"=q" (res),"=m" (*m):"0" (0x1));
  30         return res;
  31 }
  32 
  33 #define save_flags(x) \
  34 __asm__ __volatile__("pushfl ; popl %0":"=r" (x)::"memory")
  35 
  36 #define restore_flags(x) \
  37 __asm__ __volatile__("pushl %0 ; popfl"::"r" (x):"memory")
  38 
  39 #define iret() __asm__ __volatile__ ("iret":::"memory")
  40 
  41 #define _set_gate(gate_addr,type,dpl,addr) \
  42 __asm__ __volatile__ ("movw %%dx,%%ax\n\t" \
  43         "movw %2,%%dx\n\t" \
  44         "movl %%eax,%0\n\t" \
  45         "movl %%edx,%1" \
  46         :"=m" (*((long *) (gate_addr))), \
  47          "=m" (*(1+(long *) (gate_addr))) \
  48         :"i" ((short) (0x8000+(dpl<<13)+(type<<8))), \
  49          "d" ((char *) (addr)),"a" (KERNEL_CS << 16) \
  50         :"ax","dx")
  51 
  52 #define set_intr_gate(n,addr) \
  53         _set_gate(&idt[n],14,0,addr)
  54 
  55 #define set_trap_gate(n,addr) \
  56         _set_gate(&idt[n],15,0,addr)
  57 
  58 #define set_system_gate(n,addr) \
  59         _set_gate(&idt[n],15,3,addr)
  60 
  61 #define set_call_gate(a,addr) \
  62         _set_gate(a,12,3,addr)
  63 
  64 #define _set_seg_desc(gate_addr,type,dpl,base,limit) {\
  65         *(gate_addr) = ((base) & 0xff000000) | \
  66                 (((base) & 0x00ff0000)>>16) | \
  67                 ((limit) & 0xf0000) | \
  68                 ((dpl)<<13) | \
  69                 (0x00408000) | \
  70                 ((type)<<8); \
  71         *((gate_addr)+1) = (((base) & 0x0000ffff)<<16) | \
  72                 ((limit) & 0x0ffff); }
  73 
  74 #define _set_tssldt_desc(n,addr,limit,type) \
  75 __asm__ __volatile__ ("movw $" #limit ",%1\n\t" \
  76         "movw %%ax,%2\n\t" \
  77         "rorl $16,%%eax\n\t" \
  78         "movb %%al,%3\n\t" \
  79         "movb $" type ",%4\n\t" \
  80         "movb $0x00,%5\n\t" \
  81         "movb %%ah,%6\n\t" \
  82         "rorl $16,%%eax" \
  83         ::"a" (addr+0xc0000000), "m" (*(n)), "m" (*(n+2)), "m" (*(n+4)), \
  84          "m" (*(n+5)), "m" (*(n+6)), "m" (*(n+7)) \
  85         )
  86 
  87 #define set_tss_desc(n,addr) _set_tssldt_desc(((char *) (n)),((int)(addr)),231,"0x89")
  88 #define set_ldt_desc(n,addr) _set_tssldt_desc(((char *) (n)),((int)(addr)),23,"0x82")
  89 
  90 #endif

/* */