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")