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//! Task State Segment
const boot_limits = @import("../../common/limits/boot.zig");
const serial = @import("../../drivers/serial/serial.zig");
const TSS = packed struct {
reserved1: u32,
rsp0: u64,
rsp1: u64,
rsp2: u64,
reserved2: u64,
ist1: u64,
ist2: u64,
ist3: u64,
ist4: u64,
ist5: u64,
ist6: u64,
ist7: u64,
reserved3: u64,
reserved4: u16,
iomap_base: u16,
};
var tss: TSS align(16) = undefined;
var kernel_stack: [boot_limits.KERNEL_STACK_SIZE]u8 align(16) = undefined;
var ist1_stack: [65536]u8 align(16) = undefined; // 64KB for double fault/page fault
pub fn init() void {
const tss_bytes = @as([*]u8, @ptrCast(&tss));
for (0..@sizeOf(TSS)) |i| {
tss_bytes[i] = 0;
}
tss.rsp0 = @intFromPtr(&kernel_stack) + kernel_stack.len;
tss.ist1 = @intFromPtr(&ist1_stack) + ist1_stack.len;
serial.printf("TSS: addr={x} rsp0={x} ist1={x}\n", .{ @intFromPtr(&tss), tss.rsp0, tss.ist1 });
}
pub fn get_address() u64 {
return @intFromPtr(&tss);
}
pub fn get_size() u64 {
return @sizeOf(TSS) - 1;
}
pub fn set_kernel_stack(stack_pointer: u64) void {
tss.rsp0 = stack_pointer;
}
pub fn get_kernel_stack() u64 {
return tss.rsp0;
}
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