30 lines
909 B
C
30 lines
909 B
C
#ifndef __KERN_MM_MEMLAYOUT_H__
|
|
#define __KERN_MM_MEMLAYOUT_H__
|
|
|
|
/* This file contains the definitions for memory management in our OS. */
|
|
|
|
/* global segment number */
|
|
#define SEG_KTEXT 1
|
|
#define SEG_KDATA 2
|
|
#define SEG_UTEXT 3
|
|
#define SEG_UDATA 4
|
|
#define SEG_TSS 5
|
|
|
|
/* global descriptor numbers */
|
|
#define GD_KTEXT ((SEG_KTEXT) << 3) // kernel text
|
|
#define GD_KDATA ((SEG_KDATA) << 3) // kernel data
|
|
#define GD_UTEXT ((SEG_UTEXT) << 3) // user text
|
|
#define GD_UDATA ((SEG_UDATA) << 3) // user data
|
|
#define GD_TSS ((SEG_TSS) << 3) // task segment selector
|
|
|
|
#define DPL_KERNEL (0)
|
|
#define DPL_USER (3)
|
|
|
|
#define KERNEL_CS ((GD_KTEXT) | DPL_KERNEL)
|
|
#define KERNEL_DS ((GD_KDATA) | DPL_KERNEL)
|
|
#define USER_CS ((GD_UTEXT) | DPL_USER)
|
|
#define USER_DS ((GD_UDATA) | DPL_USER)
|
|
|
|
#endif /* !__KERN_MM_MEMLAYOUT_H__ */
|
|
|