电子工业出版社《自己动手写操作系统》源代码
源代码在线查看： const.h
/*++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
const.h
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Forrest Yu, 2005
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/
#ifndef _TINIX_CONST_H_
#define _TINIX_CONST_H_
/* EXTERN */
#define EXTERN extern /* EXTERN is defined as extern except in global.c */
/* 函数类型 */
#define PUBLIC /* PUBLIC is the opposite of PRIVATE */
#define PRIVATE static /* PRIVATE x limits the scope of x */
/* Boolean */
#define TRUE 1
#define FALSE 0
/* GDT 和 IDT 中描述符的个数 */
#define GDT_SIZE 128
#define IDT_SIZE 256
/* 权限 */
#define PRIVILEGE_KRNL 0
#define PRIVILEGE_TASK 1
#define PRIVILEGE_USER 3
/* RPL */
#define RPL_KRNL SA_RPL0
#define RPL_TASK SA_RPL1
#define RPL_USER SA_RPL3
/* 8259A interrupt controller ports. */
#define INT_M_CTL 0x20 /* I/O port for interrupt controller */
#define INT_M_CTLMASK 0x21 /* setting bits in this port disables ints */
#define INT_S_CTL 0xA0 /* I/O port for second interrupt controller */
#define INT_S_CTLMASK 0xA1 /* setting bits in this port disables ints */
#endif /* _TINIX_CONST_H_ */
