source: mainline/kernel/arch/amd64/src/kseg.c

Last change on this file was aafed15, checked in by Jiří Zárevúcky <zarevucky.jiri@…>, 7 years ago

Declare malloc() etc in standard <stdlib.h> rather than <mm/slab.h>

  • Property mode set to 100644
File size: 2.0 KB
Line 
1/*
2 * Copyright (c) 2016 Jakub Jermar
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * - Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * - Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * - The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29/** @addtogroup kernel_amd64
30 * @{
31 */
32/** @file
33 */
34
35#include <arch/kseg.h>
36#include <arch/asm.h>
37#include <panic.h>
38#include <arch/kseg_struct.h>
39#include <stdlib.h>
40
41/**
42 * Allocate and initialize a per-CPU structure to be accessible via the
43 * GS_KERNEL segment register.
44 */
45void kseg_init(void)
46{
47 kseg_t *kseg;
48
49 kseg = (kseg_t *) malloc(sizeof(kseg_t));
50 if (!kseg)
51 panic("Cannot allocate kseg.");
52
53 kseg->ustack_rsp = 0;
54 kseg->kstack_rsp = 0;
55 kseg->fsbase = read_msr(AMD_MSR_FS);
56
57 write_msr(AMD_MSR_GS_KERNEL, (uintptr_t) kseg);
58}
59
60/** @}
61 */
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