/*
* Copyright (c) 2016 Jakub Jermar
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - 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.
* - The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*/
/** @addtogroup kernel_amd64
* @{
*/
/** @file
*/
#include <arch/kseg.h>
#include <arch/asm.h>
#include <panic.h>
#include <arch/kseg_struct.h>
#include <stdlib.h>
/**
* Allocate and initialize a per-CPU structure to be accessible via the
* GS_KERNEL segment register.
*/
void kseg_init(void)
{
kseg_t *kseg;
kseg = (kseg_t *) malloc(sizeof(kseg_t));
if (!kseg)
panic("Cannot allocate kseg.");
kseg->ustack_rsp = 0;
kseg->kstack_rsp = 0;
kseg->fsbase = read_msr(AMD_MSR_FS);
write_msr(AMD_MSR_GS_KERNEL, (uintptr_t) kseg);
}
/** @}
*/