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/*
* Copyright (c) 2023 Ian Marco Moffett and the Osmora Team.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Hyra nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <machine/gdt.h>
struct gdt_entry g_gdt[256] = {
/* Null */
{0},
/* Kernel code (0x8) */
{
.limit = 0x0000,
.base_low = 0x0000,
.base_mid = 0x00,
.access = 0x9A,
.granularity = 0x20,
.base_hi = 0x00
},
/* Kernel data (0x10) */
{
.limit = 0x0000,
.base_low = 0x0000,
.base_mid = 0x00,
.access = 0x92,
.granularity = 0x00,
.base_hi = 0x00
},
/* User code (0x18) */
{
.limit = 0x0000,
.base_low = 0x0000,
.base_mid = 0x00,
.access = 0xFA,
.granularity = 0xAF,
.base_hi = 0x00
},
/* User data (0x20) */
{
.limit = 0x0000,
.base_low = 0x0000,
.base_mid = 0x00,
.access = 0xF2,
.granularity = 0x00,
.base_hi = 0x00
},
/* TSS segment (0x28) */
{0}
};
struct gdt_entry *g_gdt_tss = &g_gdt[GDT_TSS];
struct gdtr g_gdtr = {
.limit = sizeof(struct gdt_entry) * 256 - 1,
.offset = (uintptr_t)&g_gdt[0]
};
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