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
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
|
#ifndef INTERRUPTS_H
#define INTERRUPTS_H
#include "stdint.h"
#include "port.h"
#include "tasks.h"
// total number of supported interrupts
#define NOF_INTERRUPTS 256
// offset for hardware interrupts
#define IRQ_BASE 0x20
// TODO: for now the code segment is the first entry in the boot GDT
// temporary, should be a gdt module with functions to retrieve the
// current code segment selector
#define GDT_CODE_SEGMENT_SELECTOR 8
// TCC 0.9.26 bug?, __attribute__( ( packed ) ) on structs not working,
// also not working on members.. resorting to pragmas
#if defined( __TINYC__ )
#pragma pack(1)
#endif
// packed IDT structure, note TCC needs every member to have a packed
// attribute, GCC/Clang are happy with the packed attribute at the
// structure level
typedef struct interrupt_gate_descriptor_t {
uint16_t handler_address_low_bits;
uint16_t gdt_code_segment_selector;
uint8_t reserved;
uint8_t access;
uint16_t handler_address_high_bits;
} __attribute__( ( packed ) ) interrupt_gate_descriptor_t;
#if defined( __TINYC__ )
#pragma pack()
#endif
#if defined( __TINYC__ )
#pragma pack(1)
#endif
typedef struct {
uint16_t size;
uint32_t base;
} __attribute__( ( packed ) ) interrupt_descriptor_table_pointer_t;
#if defined( __TINYC__ )
#pragma pack()
#endif
struct interrupt_t;
struct interrupt_handler_t;
typedef uint32_t (*interrupt_handler_func_t)( struct interrupt_handler_t *handler, uint32_t esp );
typedef struct interrupt_handler_t {
uint8_t interrupt_no;
struct interrupt_t *interrupt;
interrupt_handler_func_t handle;
void *driver;
} interrupt_handler_t;
void interrupt_handler_init_void( interrupt_handler_t *handler, struct interrupt_t *interrupt );
void interrupt_handler_init( interrupt_handler_t *handler, uint8_t interrupt_no, struct interrupt_t *interrupt, interrupt_handler_func_t handle, void *driver );
typedef struct interrupt_t {
interrupt_descriptor_table_pointer_t idt_pointer;
interrupt_gate_descriptor_t descriptor_table[NOF_INTERRUPTS];
interrupt_handler_t interrupt_handler[NOF_INTERRUPTS];
task_manager_t *task_manager;
// PIC master control register: command and status register
port8_t PIC_master_control;
// PIC master data register: interrupt mask and data register
port8_t PIC_master_data;
// since PC/AT we always have a slave PIC, we don't support the PC/XT architecture
// with just one PIC
port8_t PIC_slave_control;
port8_t PIC_slave_data;
} interrupt_t;
void interrupts_enable( void );
void interrupts_disable( void );
void interrupts_init( interrupt_t *interrupt, uint16_t gdt_code_segment_selector, task_manager_t *task_manager );
void interrupts_register_interrupt_gate( interrupt_t *interrupt,
uint8_t interrupt_no, uint16_t gdt_code_segment_selector,
void (*helper_handler)( ), uint8_t privilege_level, uint8_t descriptor_type );
void interrupts_register_interrupt_handler( interrupt_handler_t handler );
void interrupts_load_idt( interrupt_descriptor_table_pointer_t *idt_pointer );
uint32_t interrupts_handle_interrupt( interrupt_t *interrupt, uint8_t interrupt_no, uint32_t esp );
uint32_t interrupts_handle_static_interrupt( uint8_t interrupt_no, uint32_t esp );
uint32_t interrupts_exception_division_by_zero( interrupt_handler_t *handler, uint32_t esp );
uint32_t interrupts_interrupt_PIT( interrupt_handler_t *handler, uint32_t esp );
void interrupts_ignore_request( );
void interrupts_handle_exception_0x00( );
void interrupts_handle_irq_0x00( );
void interrupts_handle_irq_0x01( );
void interrupts_handle_irq_0x09( );
void interrupts_handle_irq_0x0A( );
void interrupts_handle_irq_0x0B( );
void interrupts_handle_irq_0x0C( );
// later: tasks and stacks, queues
#endif // INTERRUPTS_H
|
