?? system.h
字號:
#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
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