source: trunk/hal/x86_64/core/hal_irqmask.c @ 118

Last change on this file since 118 was 118, checked in by max@…, 5 years ago

add hal_restore_irq

File size: 1.3 KB
Line 
1/*
2 * hal_irqmask.c - implementation of Generic IRQ Masking API for x86
3 *
4 * Copyright (c) 2017 Maxime Villard
5 *
6 * This file is part of ALMOS-MKH.
7 *
8 * ALMOS-MKH is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; version 2.0 of the License.
11 *
12 * ALMOS-MKH is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15 * General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with ALMOS-MKH.; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22#include <hal_types.h>
23#include <hal_internal.h>
24
25static int interrupts_enabled __in_kdata = 0;
26
27inline void hal_disable_irq(uint32_t *old)
28{
29        if (!interrupts_enabled) {
30                x86_panic("nested critical sections forbidden");
31        }
32        interrupts_enabled = 0;
33        cli();
34}
35
36inline void hal_enable_irq(uint32_t *old)
37{
38        if (interrupts_enabled) {
39                x86_panic("nested critical sections forbidden");
40        }
41        interrupts_enabled = 1;
42        sti();
43}
44
45inline void hal_restore_irq(uint32_t old)
46{
47        if (interrupts_enabled)
48                hal_disable_irq(&old);
49        else
50                hal_enable_irq(&old);
51}
52
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