set_gate.h

阿基米德操作系统的源代码

//////////////////////////////////////////////////////////////////////////
#define _set_gate(gate_addr,type,dpl,addr)			\
__asm__ __volatile__("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))),\
		 "m" (*((char *) (gate_addr))),				\
		 "m" (*(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)

//////////////////////////////////////////////////////////////////////////