62 lines
1.6 KiB
C
62 lines
1.6 KiB
C
/*
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* Copyright (C) 2009 Juergen Beisert, Pengutronix
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*
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*/
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/**
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* @file
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* @brief Declarations to bring some light in the real/protected/flat mode darkness
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*/
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#ifndef _ASM_X86_MODES_H
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#define _ASM_X86_MODES_H
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#ifndef __ASSEMBLY__
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#include <types.h>
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extern uint64_t gdt[];
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extern unsigned gdt_size;
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#endif
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/** to simplify GDT entry generation */
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#define GDT_ENTRY(flags, base, limit) \
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((((base) & 0xff000000ULL) << (56-24)) | \
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(((flags) & 0x0000f0ffULL) << 40) | \
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(((limit) & 0x000f0000ULL) << (48-16)) | \
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(((base) & 0x00ffffffULL) << 16) | \
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(((limit) & 0x0000ffffULL)))
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/** 32 bit barebox text */
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#define GDT_ENTRY_BOOT_CS 2
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#define __BOOT_CS (GDT_ENTRY_BOOT_CS * 8)
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/** 32 bit barebox data */
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#define GDT_ENTRY_BOOT_DS 3
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#define __BOOT_DS (GDT_ENTRY_BOOT_DS * 8)
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/** 16 bit barebox text */
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#define GDT_ENTRY_REAL_CS 4
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#define __REAL_CS (GDT_ENTRY_REAL_CS * 8)
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/** 16 bit barebox data */
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#define GDT_ENTRY_REAL_DS 5
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#define __REAL_DS (GDT_ENTRY_REAL_DS * 8)
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/** Something to make others happy */
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#define GDT_ENTRY_BOOT_TSS 6
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#define __BOOT_TSS (GDT_ENTRY_BOOT_TSS * 8)
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#endif /* _ASM_X86_MODES_H */
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