#define move_to_user_mode() \__asm__ ("movl %%esp,%%eax\n\t" \	"pushl $0x17\n\t" \	"pushl %%eax\n\t" \	"pushfl\n\t" \	"pushl $0x0f\n\t" \	"pushl $1f\n\t" \	"iret\n" \	"1:\tmovl $0x17,%%eax\n\t" \	"movw %%ax,%%ds\n\t" \	"movw %%ax,%%es\n\t" \	"movw %%ax,%%fs\n\t" \	"movw %%ax,%%gs" \	:::"ax")#define sti() __asm__ ("sti"::)#define cli() __asm__ ("cli"::)#define nop() __asm__ ("nop"::)#define iret() __asm__ ("iret"::)#define _set_gate(gate_addr,type,dpl,addr) \__asm__ ("movw %%dx,%%ax\n\t" \	"movw %0,%%dx\n\t" \	"movl %%eax,%1\n\t" \	"movl %%edx,%2" \	: \	: "i" ((short) (0x8000+(dpl<<13)+(type<<8))), \	"o" (*((char *) (gate_addr))), \	"o" (*(4+(char *) (gate_addr))), \	"d" ((char *) (addr)),"a" (0x00080000))#define set_intr_gate(n,addr) \	_set_gate(&idt[n],14,0,addr)#define set_trap_gate(n,addr) \	_set_gate(&idt[n],15,0,addr)#define set_system_gate(n,addr) \	_set_gate(&idt[n],15,3,addr)#define _set_seg_desc(gate_addr,type,dpl,base,limit) {\	*(gate_addr) = ((base) & 0xff000000) | \		(((base) & 0x00ff0000)>>16) | \		((limit) & 0xf0000) | \		((dpl)<<13) | \		(0x00408000) | \		((type)<<8); \	*((gate_addr)+1) = (((base) & 0x0000ffff)<<16) | \		((limit) & 0x0ffff); }#define _set_tssldt_desc(n,addr,type) \__asm__ ("movw $104,%1\n\t" \	"movw %%ax,%2\n\t" \	"rorl $16,%%eax\n\t" \	"movb %%al,%3\n\t" \	"movb $" type ",%4\n\t" \	"movb $0x00,%5\n\t" \	"movb %%ah,%6\n\t" \	"rorl $16,%%eax" \	::"a" (addr), "m" (*(n)), "m" (*(n+2)), "m" (*(n+4)), \	 "m" (*(n+5)), "m" (*(n+6)), "m" (*(n+7)) \	)#define set_tss_desc(n,addr) _set_tssldt_desc(((char *) (n)),addr,"0x89")#define set_ldt_desc(n,addr) _set_tssldt_desc(((char *) (n)),addr,"0x82")