51 lines
2.3 KiB
C
51 lines
2.3 KiB
C
/*
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* plex86: run multiple x86 operating systems concurrently
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* Copyright (C) 1999-2003 Kevin P. Lawton
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*
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* tss.h: defines for x86 hardware tasking structures
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef __TSS_H__
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#define __TSS_H__
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typedef struct
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{
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Bit16u back, RESERVED0; /* Backlink */
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Bit32u esp0; /* The CK stack pointer */
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Bit16u ss0, RESERVED1; /* The CK stack selector */
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Bit32u esp1; /* The parent KL stack pointer */
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Bit16u ss1, RESERVED2; /* The parent KL stack selector */
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Bit32u esp2; /* Unused */
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Bit16u ss2, RESERVED3; /* Unused */
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Bit32u cr3; /* The page directory pointer */
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Bit32u eip; /* The instruction pointer */
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Bit32u eflags; /* The flags */
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Bit32u eax, ecx, edx, ebx; /* The general purpose registers */
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Bit32u esp, ebp, esi, edi; /* The special purpose registers */
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Bit16u es, RESERVED4; /* The extra selector */
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Bit16u cs, RESERVED5; /* The code selector */
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Bit16u ss, RESERVED6; /* The application stack selector */
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Bit16u ds, RESERVED7; /* The data selector */
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Bit16u fs, RESERVED8; /* And another extra selector */
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Bit16u gs, RESERVED9; /* ... and another one */
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Bit16u ldt, RESERVED10; /* The local descriptor table */
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Bit16u trap; /* The trap flag (for debugging) */
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Bit16u io; /* The I/O Map base address */
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} __attribute__ ((packed)) tss_t;
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#endif /* __TSS_H__ */
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