#ifndef __ASM_SYSTEM_H#define __ASM_SYSTEM_H#include <linux/segment.h>#define move_to_user_mode() \__asm__ __volatile__ ("movl %%esp,%%eax\n\t" \	"pushl %0\n\t" \	"pushl %%eax\n\t" \	"pushfl\n\t" \	"pushl %1\n\t" \	"pushl $1f\n\t" \	"iret\n" \	"1:\tmovl %0,%%eax\n\t" \	"mov %%ax,%%ds\n\t" \	"mov %%ax,%%es\n\t" \	"mov %%ax,%%fs\n\t" \	"mov %%ax,%%gs" \	: /* no outputs */ :"i" (USER_DS), "i" (USER_CS):"ax")#define sti() __asm__ __volatile__ ("sti": : :"memory")#define cli() __asm__ __volatile__ ("cli": : :"memory")#define nop() __asm__ __volatile__ ("nop")/* * Clear and set 'TS' bit respectively */#define clts() __asm__ __volatile__ ("clts")#define stts() \__asm__ __volatile__ ( \	"movl %%cr0,%%eax\n\t" \	"orl $8,%%eax\n\t" \	"movl %%eax,%%cr0" \	: /* no outputs */ \	: /* no inputs */ \	:"ax")extern inline int tas(char * m){	char res;	__asm__("xchgb %0,%1":"=q" (res),"=m" (*m):"0" (0x1));	return res;}#define save_flags(x) \__asm__ __volatile__("pushfl ; popl %0":"=r" (x): /* no input */ :"memory")#define restore_flags(x) \__asm__ __volatile__("pushl %0 ; popfl": /* no output */ :"r" (x):"memory")#define iret() __asm__ __volatile__ ("iret": : :"memory")#define _set_gate(gate_addr,type,dpl,addr) \__asm__ __volatile__ ("movw %%dx,%%ax\n\t" \	"movw %2,%%dx\n\t" \	"movl %%eax,%0\n\t" \	"movl %%edx,%1" \	:"=m" (*((long *) (gate_addr))), \	 "=m" (*(1+(long *) (gate_addr))) \	:"i" ((short) (0x8000+(dpl<<13)+(type<<8))), \	 "d" ((char *) (addr)),"a" (KERNEL_CS << 16) \	:"ax","dx")#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_call_gate(a,addr) \	_set_gate(a,12,3,addr)#define _set_seg_desc(gate_addr,type,dpl,base,limit) {\	*((gate_addr)+1) = ((base) & 0xff000000) | \		(((base) & 0x00ff0000)>>16) | \		((limit) & 0xf0000) | \		((dpl)<<13) | \		(0x00408000) | \		((type)<<8); \	*(gate_addr) = (((base) & 0x0000ffff)<<16) | \		((limit) & 0x0ffff); }#define _set_tssldt_desc(n,addr,limit,type) \__asm__ __volatile__ ("movw $" #limit ",%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" \	: /* no output */ \	:"a" (addr+0xc0000000), "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)),((int)(addr)),235,"0x89")#define set_ldt_desc(n,addr,size) \	_set_tssldt_desc(((char *) (n)),((int)(addr)),((size << 3) - 1),"0x82")#endif