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178 palkovsky 1 
/*
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 * Copyright (C) 2001-2004 Jakub Jermar
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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#include <arch/pm.h>
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#include <arch/mm/page.h>
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#include <arch/types.h>
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/*
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 * There is no segmentation in long mode so we set up flat mode. In this
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 * mode, we use, for each privilege level, two segments spanning the
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 * whole memory. One is for code and one is for data.
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 */
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struct descriptor gdt[GDT_ITEMS] = {
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    /* NULL descriptor */
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    { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
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    /* KTEXT descriptor */
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    { .limit_0_15  = 0xffff,
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      .base_0_15   = 0,
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      .base_16_23  = 0,
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      .access      = AR_PRESENT | AR_CODE | DPL_KERNEL | AR_READABLE ,
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      .limit_16_19 = 0xf,
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      .available   = 0,
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      .longmode    = 1,
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      .special     = 0,
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      .granularity = 1,
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      .base_24_31  = 0 },
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    /* KDATA descriptor */
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    { .limit_0_15  = 0xffff,
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      .base_0_15   = 0,
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      .base_16_23  = 0,
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      .access      = AR_PRESENT | AR_DATA | AR_WRITABLE | DPL_KERNEL,
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      .limit_16_19 = 0xf,
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      .available   = 0,
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      .longmode    = 0,
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      .special     = 0,
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      .granularity = 1,
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      .base_24_31  = 0 },
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    /* UTEXT descriptor */
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    { .limit_0_15  = 0xffff,
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      .base_0_15   = 0,
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      .base_16_23  = 0,
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      .access      = AR_PRESENT | AR_CODE | DPL_USER,
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      .limit_16_19 = 0xf,
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      .available   = 0,
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      .longmode    = 1,
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      .special     = 0,
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      .granularity = 0,
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      .base_24_31  = 0 },
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    /* UDATA descriptor */
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    { .limit_0_15  = 0xffff,
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      .base_0_15   = 0,
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      .base_16_23  = 0,
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      .access      = AR_PRESENT | AR_DATA | AR_WRITABLE | DPL_USER,
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      .limit_16_19 = 0xf,
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      .available   = 0,
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      .longmode    = 0,
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      .special     = 1,
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      .granularity = 1,
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      .base_24_31  = 0 },
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    /* KTEXT 16-bit protected */
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    { .limit_0_15  = 0xffff,
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      .base_0_15   = 0,
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      .base_16_23  = 0,
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      .access      = AR_PRESENT | AR_CODE | DPL_KERNEL | AR_READABLE,
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      .limit_16_19 = 0xf,
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      .available   = 0,
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      .longmode    = 0,
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      .special     = 0,
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      .granularity = 1,
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      .base_24_31  = 0 },
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    /* TSS descriptor - set up will be completed later */
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    { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }
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};
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struct idescriptor idt[IDT_ITEMS];
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static struct tss tss;
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/* Does not compile correctly if it does not exist */
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int __attribute__ ((section ("K_DATA_START"))) __fake;