const std = @import("std");
const uefi = std.os.uefi;

const Path = @import("../Config.zig").Path;
const luefi = @import("../luefi.zig");

const log = std.log.scoped(.chainload);

const Chainload = @This();

img_buffer: []align(4096) u8,
img_pages: usize,

pub fn load(path: Path) !Chainload {
    const buffer, const pages = try luefi.pathReadAlloc(path);
    errdefer luefi.freePages(buffer, pages);

    return .{
        .img_buffer = buffer,
        .img_pages = pages,
    };
}

pub fn deinit(self: Chainload) void {
    luefi.freePages(self.img_buffer, self.img_pages);
}

pub fn start(self: Chainload) !uefi.Status {
    const boot_svc = uefi.system_table.boot_services.?;

    const handle, _ = try luefi.loadImage(self.img_buffer);
    defer luefi.unloadImage(handle);

    const exit_data = try boot_svc.startImage(handle);
    return exit_data.code;
}