blob: 2bd44938809b1ff6ed917865ec27b68aa7a0f929 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
|
/*
* bubbl
* Copyright (C) 2024-2025 Raghuram Subramani <raghus2247@gmail.com>
*
* 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/>.
*/
#ifndef __boot_interrupts_h
#define __boot_interrupts_h
#include <boot/gdt.h>
#include <common.h>
#include <stdint.h>
#define IDT_ENTRY(isr, attributes) \
{ \
(isr & 0xffff), /* isr_low */ \
GDT_KERNEL_CODE_OFFSET, /* segment_selector */ \
0, /* reserved */ \
attributes, /* attributes */ \
(isr >> 16) /* isr_high */ \
}
/* Attributes */
#define IDT_PRESENT (1 << 7)
#define IDT_KERNEL_PRIVILEGE_LEVEL (0)
#define IDT_USER_PRIVILEGE_LEVEL (3 << 5)
#define IDT_TASK_GATE (0b0101)
#define IDT_16BIT_INTERRUPT_GATE (0b0110)
#define IDT_16BIT_TRAP_GATE (0b0111)
#define IDT_32BIT_INTERRUPT_GATE (0b1110)
#define IDT_32BIT_TRAP_GATE (0b1111)
namespace Interrupts
{
typedef struct {
uint16_t isr_low;
uint16_t segment_selector;
uint8_t reserved;
uint8_t attributes;
uint16_t isr_high;
} PACKED entry_t;
typedef struct {
uint16_t limit; /* sizeof(IDT) - 1 */
entry_t *ptr; /* Address of IDT */
} PACKED descriptor_t;
/* Simply loads IDT and enables interrupts */
void initialize(void);
void enable(void);
void disable(void);
/* IDT */
void load_idt(void);
bool idt_loaded(void);
extern "C" NORETURN void exception_handler(void);
}
#endif
|
