81df510743
- use readable macros instead of constants - use the same error number like newlib git-svn-id: http://svn.lfbs.rwth-aachen.de/svn/scc/trunk/MetalSVM@156 315a16e6-25f9-4109-90ae-ca3045a26c18
72 lines
1.8 KiB
C
72 lines
1.8 KiB
C
/*
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* Copyright 2010 Stefan Lankes, Chair for Operating Systems,
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* RWTH Aachen University
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* This file is part of MetalSVM.
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*/
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#ifndef __ARCH_GDT_H__
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#define __ARCH_GDT_H__
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#include <metalsvm/stddef.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define GDT_FLAG_DATASEG 0x02
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#define GDT_FLAG_CODESEG 0x0a
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#define GDT_FLAG_TSS 0x09
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#define GDT_FLAG_TSS_BUSY 0x02
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#define GDT_FLAG_SEGMENT 0x10
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#define GDT_FLAG_RING0 0x00
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#define GDT_FLAG_RING1 0x20
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#define GDT_FLAG_RING2 0x40
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#define GDT_FLAG_RING3 0x60
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#define GDT_FLAG_PRESENT 0x80
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#define GDT_FLAG_4K_GRAN 0x80
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#define GDT_FLAG_32_BIT 0x40
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/* Defines a GDT entry */
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typedef struct {
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unsigned short limit_low;
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unsigned short base_low;
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unsigned char base_middle;
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unsigned char access;
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unsigned char granularity;
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unsigned char base_high;
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} __attribute__ ((packed)) gdt_entry_t;
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typedef struct {
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unsigned short limit;
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unsigned int base;
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} __attribute__ ((packed)) gdt_ptr_t;
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#define GDT_ENTRIES (5+MAX_TASKS)
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#if GDT_ENTRIES > 8192
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#error Too many GDT entries!
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#endif
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//extern gdt_entry_t gdt[GDT_ENTRIES];
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void gdt_install(void);
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#ifdef __cplusplus
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}
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#endif
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#endif
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