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//! IDT Gate Descriptor (64-bit)
pub const GateType = enum(u4) {
interrupt = 0xE,
trap = 0xF,
};
pub const DPL = enum(u2) {
ring0 = 0,
ring1 = 1,
ring2 = 2,
ring3 = 3,
};
pub const Gate64 = packed struct(u128) {
offset_low: u16,
selector: u16,
ist: u3,
reserved0: u5 = 0,
gate_type: GateType,
zero: u1 = 0,
dpl: DPL,
present: bool,
offset_mid: u16,
offset_high: u32,
reserved1: u32 = 0,
pub fn empty() Gate64 {
return @bitCast(@as(u128, 0));
}
pub fn interrupt(handler: u64, selector: u16, ist: u3, dpl: DPL) Gate64 {
return Gate64{
.offset_low = @truncate(handler),
.selector = selector,
.ist = ist,
.gate_type = .interrupt,
.dpl = dpl,
.present = true,
.offset_mid = @truncate(handler >> 16),
.offset_high = @truncate(handler >> 32),
};
}
pub fn trap(handler: u64, selector: u16, ist: u3, dpl: DPL) Gate64 {
return Gate64{
.offset_low = @truncate(handler),
.selector = selector,
.ist = ist,
.gate_type = .trap,
.dpl = dpl,
.present = true,
.offset_mid = @truncate(handler >> 16),
.offset_high = @truncate(handler >> 32),
};
}
pub fn get_offset(self: Gate64) u64 {
return @as(u64, self.offset_low) |
(@as(u64, self.offset_mid) << 16) |
(@as(u64, self.offset_high) << 32);
}
};
comptime {
if (@sizeOf(Gate64) != 16) @compileError("Gate64 must be 16 bytes");
}
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