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