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
|
#define
TRAP_GATE_FLAGS 0x8F // p=1, dpl=0b00, type=0b1111
#define
INT_GATE_FLAGS 0x8E // p=1, dpl=0b00, type=0b1110
#define
IDT_MAX_DESCRIPTORS 256
typedef idt_entry_t = @{
isr_low = uint16, // The lower 16 bits of the ISR's address
kernel_cs = uint16, // The GDT segment selector that the CPU will load into CS before calling the ISR
ist = uint8 0, // The IST in the TSS that the CPU will load into RSP; set to zero for now
attributes = uint8, // Type and attributes; see the IDT page
isr_mid = uint16, // The higher 16 bits of the lower 32 bits of the ISR's address
isr_high = uint32, // The higher 32 bits of the ISR's address
reserved = uint32 0 // Set to zero
}
typedef idtr_t = @{
limit = uint16 (8 * IDT_MAX_DESCRIPTORS),
base = [l : addr] ptr l
}
// Interrupt frame to pass to ISR
typedef int_frame = @{
ip = [l : agz] ptr l, // instruction pointer
cs = [l : agz] ptr l, // code segment
rflags = uint64,
sp = [l : agz] ptr l, // stack pointer
ss = [l : agz] ptr l // stack segment
}
// ------- Default handlers (exceptions and interrupts)
fun default_exception_handler(frame: &int_frame) : void = "mac#"
fun default_exception_handler_e(frame: &int_frame, error_code : uint64) : void = "mac#"
fun default_interrupt_handler(frame: &int_frame) : void = "mac#"
fun default_interrupt_handler_e(frame: &int_frame, error_code : uint64) : void = "mac#"
// -------
fun idt_init() : void
|
