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/*
* Copyright (c) 2011-2014 Richard Braun.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <kern/init.h>
#include <machine/asm.h>
#include <machine/cpu.h>
.section INIT_SECTION
ASM_ENTRY(cpu_load_gdt)
#ifdef __LP64__
lgdt (%rdi)
#else /* __LP64__ */
movl 4(%esp), %eax
lgdt (%eax)
#endif /* __LP64__ */
movl $CPU_GDT_SEL_DATA, %eax
movl %eax, %ds
movl %eax, %es
movl %eax, %ss
/* Alter the stack to reload the code segment using a far return */
#ifdef __LP64__
popq %rax
pushq $CPU_GDT_SEL_CODE
pushq %rax
lretq
#else /* __LP64__ */
popl %eax
pushl $CPU_GDT_SEL_CODE
pushl %eax
lret
#endif /* __LP64__ */
ASM_END(cpu_load_gdt)
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