source: trunk/hal/x86_64/core/hal_irqmask.c @ 122

Last change on this file since 122 was 122, checked in by max@…, 5 years ago

we will fix nested interrupt contexts later

File size: 1.4 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
25#define INTRS_ENABLED   0xFFEFAAAA
26#define INTRS_DISABLED  0xD0CCCCC0
27
28static uint32_t intrs_state __in_kdata = INTRS_DISABLED;
29
30inline void hal_disable_irq(uint32_t *old)
31{
32        *old = intrs_state;
33        intrs_state = INTRS_DISABLED;
34        cli();
35}
36
37inline void hal_enable_irq(uint32_t *old)
38{
39        *old = intrs_state;
40        intrs_state = INTRS_ENABLED;
41        sti();
42}
43
44inline void hal_restore_irq(uint32_t old)
45{
46        intrs_state = old;
47
48        if (intrs_state == INTRS_ENABLED)
49                sti();
50        else if(intrs_state == INTRS_DISABLED)
51                cli();
52        else
53                x86_panic("hal_restore_irq: not reachable");
54}
55
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