#![no_std]
#![deny(missing_debug_implementations)]

use core::fmt;

use header::{Tag, TagIter};
pub use boot_loader_name::BootLoaderNameTag;
pub use elf_sections::{ElfSectionsTag, ElfSection, ElfSectionIter, ElfSectionType, ElfSectionFlags};
pub use framebuffer::{FramebufferTag, FramebufferType, FramebufferField, FramebufferColor};
pub use memory_map::{MemoryMapTag, MemoryArea, MemoryAreaIter};
pub use module::{ModuleTag, ModuleIter};
pub use command_line::CommandLineTag;
pub use rsdp::{RsdpV1Tag, RsdpV2Tag};
pub use vbe_info::{VBEInfoTag, VBEControlInfo, VBEModeInfo, VBEField, VBECapabilities, 
                   VBEModeAttributes, VBEWindowAttributes, VBEDirectColorAttributes, VBEMemoryModel};

#[macro_use]
extern crate bitflags;

mod header;
mod boot_loader_name;
mod elf_sections;
mod memory_map;
mod module;
mod command_line;
mod rsdp;
mod framebuffer;
mod vbe_info;

pub unsafe fn load(address: usize) -> BootInformation {
    assert_eq!(0, address & 0b111);
    let multiboot = &*(address as *const BootInformationInner);
    assert_eq!(0, multiboot.total_size & 0b111);
    assert!(multiboot.has_valid_end_tag());
    BootInformation { inner: multiboot, offset: 0 }
}

pub unsafe fn load_with_offset(address: usize, offset: usize) -> BootInformation {
    if !cfg!(test) {
        assert_eq!(0, address & 0b111);
        assert_eq!(0, offset & 0b111);
    }
    let multiboot = &*((address + offset) as *const BootInformationInner);
    assert_eq!(0, multiboot.total_size & 0b111);
    assert!(multiboot.has_valid_end_tag());
    BootInformation { inner: multiboot, offset: offset }
}

pub struct BootInformation {
    inner: *const BootInformationInner,
    offset: usize,
}

#[repr(C, packed)]
struct BootInformationInner {
    total_size: u32,
    _reserved: u32,
}

impl BootInformation {
    pub fn start_address(&self) -> usize {
        self.inner as usize
    }

    pub fn end_address(&self) -> usize {
        self.start_address() + self.total_size()
    }

    pub fn total_size(&self) -> usize {
        self.get().total_size as usize
    }

    pub fn elf_sections_tag(&self) -> Option<ElfSectionsTag> {
        self.get_tag(9).map(|tag| unsafe {
            elf_sections::elf_sections_tag(tag, self.offset)
        })
    }

    pub fn memory_map_tag<'a>(&'a self) -> Option<&'a MemoryMapTag> {
        self.get_tag(6).map(|tag| unsafe { &*(tag as *const Tag as *const MemoryMapTag) })
    }

    pub fn module_tags(&self) -> ModuleIter {
        module::module_iter(self.tags())
    }

    pub fn boot_loader_name_tag<'a>(&'a self) -> Option<&'a BootLoaderNameTag> {
        self.get_tag(2).map(|tag| unsafe { &*(tag as *const Tag as *const BootLoaderNameTag) })
    }

    pub fn command_line_tag<'a>(&'a self) -> Option<&'a CommandLineTag> {
        self.get_tag(1).map(|tag| unsafe { &*(tag as *const Tag as *const CommandLineTag) })
    }

    pub fn framebuffer_tag<'a>(&'a self) -> Option<FramebufferTag<'a>> {
        self.get_tag(8).map(|tag| framebuffer::framebuffer_tag(tag))
    }

    pub fn rsdp_v1_tag<'a>(&self) -> Option<&'a RsdpV1Tag> {
        self.get_tag(14).map(|tag| unsafe { &*(tag as *const Tag as *const RsdpV1Tag) })
    }

    pub fn rsdp_v2_tag<'a>(&'a self) -> Option<&'a RsdpV2Tag> {
        self.get_tag(15).map(|tag| unsafe { &*(tag as *const Tag as *const RsdpV2Tag) })
    }

    pub fn vbe_info_tag(&self) -> Option<&'static VBEInfoTag> {
        self.get_tag(7).map(|tag| unsafe { &*(tag as *const Tag as *const VBEInfoTag) })
    }

    fn get(&self) -> &BootInformationInner {
        unsafe { &*self.inner }
    }

    fn get_tag<'a>(&'a self, typ: u32) -> Option<&'a Tag> {
        self.tags().find(|tag| tag.typ == typ)
    }

    fn tags(&self) -> TagIter {
        TagIter::new(unsafe { self.inner.offset(1) } as *const _)
    }
}

impl BootInformationInner {
    fn has_valid_end_tag(&self) -> bool {
        const END_TAG: Tag = Tag { typ: 0, size: 8 };

        let self_ptr = self as *const _;
        let end_tag_addr = self_ptr as usize + (self.total_size - END_TAG.size) as usize;
        let end_tag = unsafe { &*(end_tag_addr as *const Tag) };

        end_tag.typ == END_TAG.typ && end_tag.size == END_TAG.size
    }
}

impl fmt::Debug for BootInformation {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        writeln!(f, "multiboot information")?;

        writeln!(f, "S: {:#010X}, E: {:#010X}, L: {:#010X}",
            self.start_address(), self.end_address(), self.total_size())?;

        if let Some(boot_loader_name_tag) = self.boot_loader_name_tag() {
            writeln!(f, "boot loader name: {}", boot_loader_name_tag.name())?;
        }

        if let Some(command_line_tag) = self.command_line_tag() {
            writeln!(f, "command line: {}", command_line_tag.command_line())?;
        }

        if let Some(memory_map_tag) = self.memory_map_tag() {
            writeln!(f, "memory areas:")?;
            for area in memory_map_tag.memory_areas() {
                writeln!(f, "    S: {:#010X}, E: {:#010X}, L: {:#010X}",
                    area.start_address(), area.end_address(), area.size())?;
            }
        }

        if let Some(elf_sections_tag) = self.elf_sections_tag() {
            writeln!(f, "kernel sections:")?;
            for s in elf_sections_tag.sections() {
                writeln!(f, "    name: {:15}, S: {:#08X}, E: {:#08X}, L: {:#08X}, F: {:#04X}",
                    s.name(), s.start_address(),
                    s.start_address() + s.size(), s.size(), s.flags().bits())?;
            }
        }

        writeln!(f, "module tags:")?;
        for mt in self.module_tags() {
            writeln!(f, "    name: {:15}, S: {:#010X}, E: {:#010X}",
                mt.name(), mt.start_address(), mt.end_address())?;
        }

        Ok(())
    }
}

pub(crate) struct Reader {
    pub(crate) ptr: *const u8,
    pub(crate) off: usize
}

impl Reader {
    pub(crate) fn new<T>(ptr: *const T) -> Reader {
        Reader {
            ptr: ptr as *const u8,
            off: 0
        }
    }

    pub(crate) fn read_u8(&mut self) -> u8 {
        self.off += 1;
        unsafe {
            core::ptr::read(self.ptr.offset((self.off - 1) as isize))
        }
    }

    pub(crate) fn read_u16(&mut self) -> u16 {
        self.read_u8() as u16 | (self.read_u8() as u16) << 8
    }

    pub(crate) fn read_u32(&mut self) -> u32 {
        self.read_u16() as u32 | (self.read_u16() as u32) << 16
    }

    pub(crate) fn read_u64(&mut self) -> u64 {
        self.read_u32() as u64 | (self.read_u32() as u64) << 32
    }

    pub(crate) fn skip(&mut self, n: usize) {
        self.off += n;
    }

    pub(crate) fn current_address(&self) -> usize {
        unsafe {
            self.ptr.offset(self.off as isize) as usize
        }
    }
}

#[cfg(test)]
mod tests {
    use super::{load, load_with_offset};
    use super::{BootInformation, ElfSectionFlags, ElfSectionType};
    use super::FramebufferType;

    #[test]
    fn no_tags() {
        #[repr(C, align(8))]
        struct Bytes([u8; 16]);
        let bytes: Bytes = Bytes([
            16, 0, 0, 0, // total_size
            0, 0, 0, 0,  // reserved
            0, 0, 0, 0,  // end tag type
            8, 0, 0, 0,  // end tag size
        ]);
        let addr = bytes.0.as_ptr() as usize;
        let bi = unsafe { load(addr) };
        assert_eq!(addr, bi.start_address());
        assert_eq!(addr + bytes.0.len(), bi.end_address());
        assert_eq!(bytes.0.len(), bi.total_size());
        assert!(bi.elf_sections_tag().is_none());
        assert!(bi.memory_map_tag().is_none());
        assert!(bi.module_tags().next().is_none());
        assert!(bi.boot_loader_name_tag().is_none());
        assert!(bi.command_line_tag().is_none());
    }


    #[test]
    #[should_panic]
    fn invalid_total_size() {
        #[repr(C, align(8))]
        struct Bytes([u8; 15]);
        let bytes: Bytes = Bytes([
            15, 0, 0, 0, // total_size
            0, 0, 0, 0,  // reserved
            0, 0, 0, 0,  // end tag type
            8, 0, 0,     // end tag size
        ]);
        let addr = bytes.0.as_ptr() as usize;
        let bi = unsafe { load(addr) };
        assert_eq!(addr, bi.start_address());
        assert_eq!(addr + bytes.0.len(), bi.end_address());
        assert_eq!(bytes.0.len(), bi.total_size());
        assert!(bi.elf_sections_tag().is_none());
        assert!(bi.memory_map_tag().is_none());
        assert!(bi.module_tags().next().is_none());
        assert!(bi.boot_loader_name_tag().is_none());
        assert!(bi.command_line_tag().is_none());
    }


    #[test]
    #[should_panic]
    fn invalid_end_tag() {
        #[repr(C, align(8))]
        struct Bytes([u8; 16]);
        let bytes: Bytes = Bytes([
            16, 0, 0, 0, // total_size
            0, 0, 0, 0,  // reserved
            0, 0, 0, 0,  // end tag type
            9, 0, 0, 0,  // end tag size
        ]);
        let addr = bytes.0.as_ptr() as usize;
        let bi = unsafe { load(addr) };
        assert_eq!(addr, bi.start_address());
        assert_eq!(addr + bytes.0.len(), bi.end_address());
        assert_eq!(bytes.0.len(), bi.total_size());
        assert!(bi.elf_sections_tag().is_none());
        assert!(bi.memory_map_tag().is_none());
        assert!(bi.module_tags().next().is_none());
        assert!(bi.boot_loader_name_tag().is_none());
        assert!(bi.command_line_tag().is_none());
    }

    #[test]
    fn name_tag() {
        #[repr(C, align(8))]
        struct Bytes([u8; 32]);
        let bytes: Bytes = Bytes([
            32, 0, 0, 0,       // total_size
            0, 0, 0, 0,        // reserved
            2, 0, 0, 0,        // boot loader name tag type
            13, 0, 0, 0,       // boot loader name tag size
            110, 97, 109, 101, // boot loader name 'name'
            0, 0, 0, 0,        // boot loader name null + padding
            0, 0, 0, 0,        // end tag type
            8, 0, 0, 0,        // end tag size
        ]);
        let addr = bytes.0.as_ptr() as usize;
        let bi = unsafe { load(addr) };
        assert_eq!(addr, bi.start_address());
        assert_eq!(addr + bytes.0.len(), bi.end_address());
        assert_eq!(bytes.0.len(), bi.total_size());
        assert!(bi.elf_sections_tag().is_none());
        assert!(bi.memory_map_tag().is_none());
        assert!(bi.module_tags().next().is_none());
        assert_eq!("name", bi.boot_loader_name_tag().unwrap().name());
        assert!(bi.command_line_tag().is_none());
    }

    #[test]
    fn framebuffer_tag_rgb() {
        // direct RGB mode test:
        // taken from GRUB2 running in QEMU at
        // 1280x720 with 32bpp in BGRA format.
        #[repr(C, align(8))]
        struct Bytes([u8; 56]);
        let bytes: Bytes = Bytes([
            56, 0, 0, 0,  // total size
            0, 0, 0, 0,   // reserved
            8, 0, 0, 0,   // framebuffer tag type
            40, 0, 0, 0,  // framebuffer tag size
            0, 0, 0, 253, // framebuffer low dword of address
            0, 0, 0, 0,   // framebuffer high dword of address
            0, 20, 0, 0,  // framebuffer pitch
            0, 5, 0, 0,   // framebuffer width
            208, 2, 0, 0, // framebuffer height
            32, 1, 0, 0,  // framebuffer bpp, type, reserved word
            16, 8, 8, 8,  // framebuffer red pos/size, green pos/size
            0, 8, 0, 0,   // framebuffer blue pos/size, padding word
            0, 0, 0, 0,   // end tag type
            8, 0, 0, 0    // end tag size
        ]);
        let addr = bytes.0.as_ptr() as usize;
        let bi = unsafe { load(addr) };
        assert_eq!(addr, bi.start_address());
        assert_eq!(addr + bytes.0.len(), bi.end_address());
        assert_eq!(bytes.0.len(), bi.total_size());
        use framebuffer::{FramebufferTag, FramebufferField, FramebufferType};
        assert_eq!(bi.framebuffer_tag(), Some(FramebufferTag {
            address: 4244635648,
            pitch: 5120,
            width: 1280,
            height: 720,
            bpp: 32,
            buffer_type: FramebufferType::RGB {
                red: FramebufferField {
                    position: 16, size: 8
                },
                green: FramebufferField {
                    position: 8, size: 8
                },
                blue: FramebufferField {
                    position: 0, size: 8
                }
            }
        }))
    }

    #[test]
    fn framebuffer_tag_indexed() {
        // indexed mode test:
        // this is synthetic, as I can't get QEMU
        // to run in indexed color mode.
        #[repr(C, align(8))]
        struct Bytes([u8; 64]);
        let bytes: Bytes = Bytes([
            64, 0, 0, 0,  // total size
            0, 0, 0, 0,   // reserved
            8, 0, 0, 0,   // framebuffer tag type
            48, 0, 0, 0,  // framebuffer tag size
            0, 0, 0, 253, // framebuffer low dword of address
            0, 0, 0, 0,   // framebuffer high dword of address
            0, 20, 0, 0,  // framebuffer pitch
            0, 5, 0, 0,   // framebuffer width
            208, 2, 0, 0, // framebuffer height
            32, 0, 0, 0,  // framebuffer bpp, type, reserved word
            4, 0, 0, 0,   // framebuffer palette length
            255, 0, 0, 0,  // framebuffer palette
            255, 0, 0, 0,
            255, 0, 0, 0, 
            0, 0, 0, 0,   // end tag type
            8, 0, 0, 0    // end tag size
        ]);
        let addr = bytes.0.as_ptr() as usize;
        let bi = unsafe { load(addr) };
        assert_eq!(addr, bi.start_address());
        assert_eq!(addr + bytes.0.len(), bi.end_address());
        assert_eq!(bytes.0.len(), bi.total_size());
        use framebuffer::{FramebufferType, FramebufferColor};
        assert!(bi.framebuffer_tag().is_some());
        let fbi = bi.framebuffer_tag().unwrap();
        assert_eq!(fbi.address, 4244635648);
        assert_eq!(fbi.pitch, 5120);
        assert_eq!(fbi.width, 1280);
        assert_eq!(fbi.height, 720);
        assert_eq!(fbi.bpp, 32);
        match fbi.buffer_type {
            FramebufferType::Indexed { palette } => assert_eq!(palette, [
                FramebufferColor { red: 255, green: 0, blue: 0 },
                FramebufferColor { red: 0, green: 255, blue: 0 },
                FramebufferColor { red: 0, green: 0, blue: 255 },
                FramebufferColor { red: 0, green: 0, blue: 0}
            ]),
            _ => panic!("Expected indexed framebuffer type.")
        }
    }

    #[test]
    fn vbe_info_tag() {
        //Taken from GRUB2 running in QEMU.
        #[repr(C, align(8))]
        struct Bytes([u8; 800]);
        let bytes = Bytes([
            32, 3, 0, 0,        // Total size.
            0, 0, 0, 0,         // Reserved
            7, 0, 0, 0,         // Tag type.
            16, 3, 0, 0,        // Tag size.
            122, 65, 255, 255,  // VBE mode, protected mode interface segment,
            0, 96, 79, 0,       // protected mode interface offset, and length.
            86, 69, 83, 65,     // "VESA" signature.
            0, 3, 220, 87,      // VBE version, lower half of OEM string ptr,
            0, 192, 1, 0,       // upper half of OEM string ptr, lower half of capabilities
            0, 0, 34, 128,      // upper half of capabilities, lower half of vide mode ptr,
            0, 96, 0, 1,        // upper half of video mode ptr, number of 64kb memory blocks
            0, 0, 240, 87,      // OEM software revision, lower half of OEM vendor string ptr,
            0, 192, 3, 88,      // upper half of OEM vendor string ptr, lower half of OEM product string ptr,
            0, 192, 23, 88,     // upper half of OEM product string ptr, lower half of OEM revision string ptr,
            0, 192, 0, 1,       // upper half of OEM revision string ptr.
            1, 1, 2, 1,         // Reserved data....
            3, 1, 4, 1, 
            5, 1, 6, 1, 
            7, 1, 13, 1, 
            14, 1, 15, 1, 
            16, 1, 17, 1, 
            18, 1, 19, 1, 
            20, 1, 21, 1, 
            22, 1, 23, 1, 
            24, 1, 25, 1, 
            26, 1, 27, 1, 
            28, 1, 29, 1, 
            30, 1, 31, 1, 
            64, 1, 65, 1, 
            66, 1, 67, 1, 
            68, 1, 69, 1, 
            70, 1, 71, 1, 
            72, 1, 73, 1, 
            74, 1, 75, 1, 
            76, 1, 117, 1, 
            118, 1, 119, 1, 
            120, 1, 121, 1, 
            122, 1, 123, 1, 
            124, 1, 125, 1, 
            126, 1, 127, 1, 
            128, 1, 129, 1, 
            130, 1, 131, 1, 
            132, 1, 133, 1, 
            134, 1, 135, 1, 
            136, 1, 137, 1, 
            138, 1, 139, 1, 
            140, 1, 141, 1, 
            142, 1, 143, 1, 
            144, 1, 145, 1, 
            146, 1, 0, 0, 
            1, 0, 2, 0, 
            3, 0, 4, 0, 
            5, 0, 6, 0, 
            7, 0, 13, 0, 
            14, 0, 15, 0, 
            16, 0, 17, 0, 
            18, 0, 19, 0, 
            106, 0, 255, 255, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0,         // Until Here
            187, 0, 7, 0,       // Mode attributes, window A and B attributes
            64, 0, 64, 0,       // Window granularity and size.
            0, 160, 0, 0,       // Window A and B segments.
            186, 84, 0, 192,    // Window relocation function pointer.
            0, 20, 0, 5,        // Pitch, X resolution.
            32, 3, 8, 16,       // Y resolution, X char size, Y char size.
            1, 32, 1, 6,        // Number of planes, BPP, number of banks, memory model.
            0, 3, 1, 8,         // Bank size, number of images, reserved, red mask size.
            16, 8, 8, 8,        // Red mask position, green mask size, green mask position, blue mask size,
            0, 8, 24, 2,        // blue mask position, reserved mask size, reserved mask position, color attributes.
            0, 0, 0, 253,       // Frame buffer base address.
            0, 0, 0, 0,         // Off screen memory offset.
            0, 0, 0, 20,        // Off screen memory size, reserved data...
            0, 0, 8, 16, 
            8, 8, 8, 0, 
            8, 24, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0, 
            0, 0, 0, 0,         // Until here.
            0, 0, 0, 0,         // End tag type.
            8, 0, 0, 0          // End tag size.
        ]);

        let addr = bytes.0.as_ptr() as usize;
        let bi = unsafe { load(addr) };
        assert_eq!(addr, bi.start_address());
        assert_eq!(addr + bytes.0.len(), bi.end_address());
        assert_eq!(bytes.0.len(), bi.total_size());
        assert!(bi.vbe_info_tag().is_some());
        let vbe = bi.vbe_info_tag().unwrap();
        use vbe_info::*;
        unsafe {
            assert_eq!(vbe.mode, 16762);
            assert_eq!(vbe.interface_segment, 65535);
            assert_eq!(vbe.interface_offset, 24576);
            assert_eq!(vbe.interface_length, 79);
            assert_eq!(vbe.control_info.signature, [86, 69, 83, 65]);
            assert_eq!(vbe.control_info.version, 768);
            assert_eq!(vbe.control_info.oem_string_ptr, 3221247964);
            assert_eq!(vbe.control_info.capabilities, VBECapabilities::SWITCHABLE_DAC);
            assert_eq!(vbe.control_info.mode_list_ptr, 1610645538);
            assert_eq!(vbe.control_info.total_memory, 256);
            assert_eq!(vbe.control_info.oem_software_revision, 0);
            assert_eq!(vbe.control_info.oem_vendor_name_ptr, 3221247984);
            assert_eq!(vbe.control_info.oem_product_name_ptr, 3221248003);
            assert_eq!(vbe.control_info.oem_product_revision_ptr, 3221248023);
            assert!(vbe.mode_info.mode_attributes.contains(
                VBEModeAttributes::SUPPORTED 
                | VBEModeAttributes::COLOR
                | VBEModeAttributes::GRAPHICS
                | VBEModeAttributes::NOT_VGA_COMPATIBLE
                | VBEModeAttributes::LINEAR_FRAMEBUFFER
            ));
            assert!(vbe.mode_info.window_a_attributes.contains(
                VBEWindowAttributes::RELOCATABLE
                | VBEWindowAttributes::READABLE
                | VBEWindowAttributes::WRITEABLE
            ));
            assert_eq!(vbe.mode_info.window_granularity, 64);
            assert_eq!(vbe.mode_info.window_size, 64);
            assert_eq!(vbe.mode_info.window_a_segment, 40960);
            assert_eq!(vbe.mode_info.window_function_ptr, 3221247162);
            assert_eq!(vbe.mode_info.pitch, 5120);
            assert_eq!(vbe.mode_info.resolution, (1280, 800));
            assert_eq!(vbe.mode_info.character_size, (8, 16));
            assert_eq!(vbe.mode_info.number_of_planes, 1);
            assert_eq!(vbe.mode_info.bpp, 32);
            assert_eq!(vbe.mode_info.number_of_banks, 1);
            assert_eq!(vbe.mode_info.memory_model, VBEMemoryModel::DirectColor);
            assert_eq!(vbe.mode_info.bank_size, 0);
            assert_eq!(vbe.mode_info.number_of_image_pages, 3);
            assert_eq!(vbe.mode_info.red_field, VBEField {
                position: 16, size: 8
            });
            assert_eq!(vbe.mode_info.green_field, VBEField {
                position: 8, size: 8
            });
            assert_eq!(vbe.mode_info.blue_field, VBEField {
                position: 0, size: 8
            });
            assert_eq!(vbe.mode_info.reserved_field, VBEField {
                position: 24, size: 8
            });
            assert_eq!(vbe.mode_info.direct_color_attributes, VBEDirectColorAttributes::RESERVED_USABLE);
            assert_eq!(vbe.mode_info.framebuffer_base_ptr, 4244635648);
            assert_eq!(vbe.mode_info.offscreen_memory_offset, 0);
            assert_eq!(vbe.mode_info.offscreen_memory_size, 0);
        }
    }

    #[test]
    fn grub2() {
        #[repr(C, align(8))]
        struct Bytes([u8; 960]);
        let mut bytes: Bytes = Bytes([
            192, 3, 0, 0,       // total_size
            0, 0, 0, 0,         // reserved
            1, 0, 0, 0,         // boot command tag type
            9, 0, 0, 0,         // boot command tag size
            0, 0, 0, 0,         // boot command null + padding
            0, 0, 0, 0,         // boot command padding
            2, 0, 0, 0,         // boot loader name tag type
            26, 0, 0, 0,        // boot loader name tag size
            71, 82, 85, 66,     // boot loader name
            32, 50, 46, 48,     // boot loader name
            50, 126, 98, 101,   // boot loader name
            116, 97, 51, 45,    // boot loader name
            53, 0, 0, 0,        // boot loader name null + padding
            0, 0, 0, 0,         // boot loader name padding
            10, 0, 0, 0,        // APM tag type
            28, 0, 0, 0,        // APM tag size
            2, 1, 0, 240,       // APM version, cseg
            207, 212, 0, 0,     // APM offset
            0, 240, 0, 240,     // APM cseg_16, dseg
            3, 0, 240, 255,     // APM flags, cseg_len
            240, 255, 240, 255, // APM cseg_16_len, dseg_len
            0, 0, 0, 0,         // APM padding
            6, 0, 0, 0,         // memory map tag type
            160, 0, 0, 0,       // memory map tag size
            24, 0, 0, 0,        // memory map entry_size
            0, 0, 0, 0,         // memory map entry_version
            0, 0, 0, 0,         // memory map entry 0 base_addr
            0, 0, 0, 0,         // memory map entry 0 base_addr
            0, 252, 9, 0,       // memory map entry 0 length
            0, 0, 0, 0,         // memory map entry 0 length
            1, 0, 0, 0,         // memory map entry 0 type
            0, 0, 0, 0,         // memory map entry 0 reserved
            0, 252, 9, 0,       // memory map entry 1 base_addr
            0, 0, 0, 0,         // memory map entry 1 base_addr
            0, 4, 0, 0,         // memory map entry 1 length
            0, 0, 0, 0,         // memory map entry 1 length
            2, 0, 0, 0,         // memory map entry 1 type
            0, 0, 0, 0,         // memory map entry 1 reserved
            0, 0, 15, 0,        // memory map entry 2 base_addr
            0, 0, 0, 0,         // memory map entry 2 base_addr
            0, 0, 1, 0,         // memory map entry 2 length
            0, 0, 0, 0,         // memory map entry 2 length
            2, 0, 0, 0,         // memory map entry 2 type
            0, 0, 0, 0,         // memory map entry 2 reserved
            0, 0, 16, 0,        // memory map entry 3 base_addr
            0, 0, 0, 0,         // memory map entry 3 base_addr
            0, 0, 238, 7,       // memory map entry 3 length
            0, 0, 0, 0,         // memory map entry 3 length
            1, 0, 0, 0,         // memory map entry 3 type
            0, 0, 0, 0,         // memory map entry 3 reserved
            0, 0, 254, 7,       // memory map entry 4 base_addr
            0, 0, 0, 0,         // memory map entry 4 base_addr
            0, 0, 2, 0,         // memory map entry 4 length
            0, 0, 0, 0,         // memory map entry 4 length
            2, 0, 0, 0,         // memory map entry 4 type
            0, 0, 0, 0,         // memory map entry 4 reserved
            0, 0, 252, 255,     // memory map entry 5 base_addr
            0, 0, 0, 0,         // memory map entry 5 base_addr
            0, 0, 4, 0,         // memory map entry 5 length
            0, 0, 0, 0,         // memory map entry 5 length
            2, 0, 0, 0,         // memory map entry 5 type
            0, 0, 0, 0,         // memory map entry 5 reserved
            9, 0, 0, 0,         // elf symbols tag type
            84, 2, 0, 0,        // elf symbols tag size
            9, 0, 0, 0,         // elf symbols num
            64, 0, 0, 0,        // elf symbols entsize
            8, 0, 0, 0,         // elf symbols shndx
            0, 0, 0, 0,         // elf symbols entry 0 name
            0, 0, 0, 0,         // elf symbols entry 0 type
            0, 0, 0, 0,         // elf symbols entry 0 flags
            0, 0, 0, 0,         // elf symbols entry 0 flags
            0, 0, 0, 0,         // elf symbols entry 0 addr
            0, 0, 0, 0,         // elf symbols entry 0 addr
            0, 0, 0, 0,         // elf symbols entry 0 offset
            0, 0, 0, 0,         // elf symbols entry 0 offset
            0, 0, 0, 0,         // elf symbols entry 0 size
            0, 0, 0, 0,         // elf symbols entry 0 size
            0, 0, 0, 0,         // elf symbols entry 0 link
            0, 0, 0, 0,         // elf symbols entry 0 info
            0, 0, 0, 0,         // elf symbols entry 0 addralign
            0, 0, 0, 0,         // elf symbols entry 0 addralign
            0, 0, 0, 0,         // elf symbols entry 0 entsize
            0, 0, 0, 0,         // elf symbols entry 0 entsize
            27, 0, 0, 0,        // elf symbols entry 1 name
            1, 0, 0, 0,         // elf symbols entry 1 type
            2, 0, 0, 0,         // elf symbols entry 1 flags
            0, 0, 0, 0,         // elf symbols entry 1 flags
            0, 0, 16, 0,        // elf symbols entry 1 addr
            0, 128, 255, 255,   // elf symbols entry 1 addr
            0, 16, 0, 0,        // elf symbols entry 1 offset
            0, 0, 0, 0,         // elf symbols entry 1 offset
            0, 48, 0, 0,        // elf symbols entry 1 size
            0, 0, 0, 0,         // elf symbols entry 1 size
            0, 0, 0, 0,         // elf symbols entry 1 link
            0, 0, 0, 0,         // elf symbols entry 1 info
            16, 0, 0, 0,        // elf symbols entry 1 addralign
            0, 0, 0, 0,         // elf symbols entry 1 addralign
            0, 0, 0, 0,         // elf symbols entry 1 entsize
            0, 0, 0, 0,         // elf symbols entry 1 entsize
            35, 0, 0, 0,        // elf symbols entry 2 name
            1, 0, 0, 0,         // elf symbols entry 2 type
            6, 0, 0, 0,         // elf symbols entry 2 flags
            0, 0, 0, 0,         // elf symbols entry 2 flags
            0, 48, 16, 0,       // elf symbols entry 2 addr
            0, 128, 255, 255,   // elf symbols entry 2 addr
            0, 64, 0, 0,        // elf symbols entry 2 offset
            0, 0, 0, 0,         // elf symbols entry 2 offset
            0, 144, 0, 0,       // elf symbols entry 2 size
            0, 0, 0, 0,         // elf symbols entry 2 size
            0, 0, 0, 0,         // elf symbols entry 2 link
            0, 0, 0, 0,         // elf symbols entry 2 info
            16, 0, 0, 0,        // elf symbols entry 2 addralign
            0, 0, 0, 0,         // elf symbols entry 2 addralign
            0, 0, 0, 0,         // elf symbols entry 2 entsize
            0, 0, 0, 0,         // elf symbols entry 2 entsize
            41, 0, 0, 0,        // elf symbols entry 3 name
            1, 0, 0, 0,         // elf symbols entry 3 type
            3, 0, 0, 0,         // elf symbols entry 3 flags
            0, 0, 0, 0,         // elf symbols entry 3 flags
            0, 192, 16, 0,      // elf symbols entry 3 addr
            0, 128, 255, 255,   // elf symbols entry 3 addr
            0, 208, 0, 0,       // elf symbols entry 3 offset
            0, 0, 0, 0,         // elf symbols entry 3 offset
            0, 32, 0, 0,        // elf symbols entry 3 size
            0, 0, 0, 0,         // elf symbols entry 3 size
            0, 0, 0, 0,         // elf symbols entry 3 link
            0, 0, 0, 0,         // elf symbols entry 3 info
            8, 0, 0, 0,         // elf symbols entry 3 addralign
            0, 0, 0, 0,         // elf symbols entry 3 addralign
            0, 0, 0, 0,         // elf symbols entry 3 entsize
            0, 0, 0, 0,         // elf symbols entry 3 entsize
            47, 0, 0, 0,        // elf symbols entry 4 name
            8, 0, 0, 0,         // elf symbols entry 4 type
            3, 0, 0, 0,         // elf symbols entry 4 flags
            0, 0, 0, 0,         // elf symbols entry 4 flags
            0, 224, 16, 0,      // elf symbols entry 4 addr
            0, 128, 255, 255,   // elf symbols entry 4 addr
            0, 240, 0, 0,       // elf symbols entry 4 offset
            0, 0, 0, 0,         // elf symbols entry 4 offset
            0, 80, 0, 0,        // elf symbols entry 4 size
            0, 0, 0, 0,         // elf symbols entry 4 size
            0, 0, 0, 0,         // elf symbols entry 4 link
            0, 0, 0, 0,         // elf symbols entry 4 info
            0, 16, 0, 0,        // elf symbols entry 4 addralign
            0, 0, 0, 0,         // elf symbols entry 4 addralign
            0, 0, 0, 0,         // elf symbols entry 4 entsize
            0, 0, 0, 0,         // elf symbols entry 4 entsize
            52, 0, 0, 0,        // elf symbols entry 5 name
            1, 0, 0, 0,         // elf symbols entry 5 type
            3, 0, 0, 0,         // elf symbols entry 5 flags
            0, 0, 0, 0,         // elf symbols entry 5 flags
            0, 48, 17, 0,       // elf symbols entry 5 addr
            0, 128, 255, 255,   // elf symbols entry 5 addr
            0, 240, 0, 0,       // elf symbols entry 5 offset
            0, 0, 0, 0,         // elf symbols entry 5 offset
            0, 0, 0, 0,         // elf symbols entry 5 size
            0, 0, 0, 0,         // elf symbols entry 5 size
            0, 0, 0, 0,         // elf symbols entry 5 link
            0, 0, 0, 0,         // elf symbols entry 5 info
            1, 0, 0, 0,         // elf symbols entry 5 addralign
            0, 0, 0, 0,         // elf symbols entry 5 addralign
            0, 0, 0, 0,         // elf symbols entry 5 entsize
            0, 0, 0, 0,         // elf symbols entry 5 entsize
            1, 0, 0, 0,         // elf symbols entry 6 name
            2, 0, 0, 0,         // elf symbols entry 6 type
            0, 0, 0, 0,         // elf symbols entry 6 flags
            0, 0, 0, 0,         // elf symbols entry 6 flags
            0, 48, 17, 0,       // elf symbols entry 6 addr
            0, 0, 0, 0,         // elf symbols entry 6 addr
            0, 240, 0, 0,       // elf symbols entry 6 offset
            0, 0, 0, 0,         // elf symbols entry 6 offset
            224, 43, 0, 0,      // elf symbols entry 6 size
            0, 0, 0, 0,         // elf symbols entry 6 size
            7, 0, 0, 0,         // elf symbols entry 6 link
            102, 1, 0, 0,       // elf symbols entry 6 info
            8, 0, 0, 0,         // elf symbols entry 6 addralign
            0, 0, 0, 0,         // elf symbols entry 6 addralign
            24, 0, 0, 0,        // elf symbols entry 6 entsize
            0, 0, 0, 0,         // elf symbols entry 6 entsize
            9, 0, 0, 0,         // elf symbols entry 7 name
            3, 0, 0, 0,         // elf symbols entry 7 type
            0, 0, 0, 0,         // elf symbols entry 7 flags
            0, 0, 0, 0,         // elf symbols entry 7 flags
            224, 91, 17, 0,     // elf symbols entry 7 addr
            0, 0, 0, 0,         // elf symbols entry 7 addr
            224, 27, 1, 0,      // elf symbols entry 7 offset
            0, 0, 0, 0,         // elf symbols entry 7 offset
            145, 55, 0, 0,      // elf symbols entry 7 size
            0, 0, 0, 0,         // elf symbols entry 7 size
            0, 0, 0, 0,         // elf symbols entry 7 link
            0, 0, 0, 0,         // elf symbols entry 7 info
            1, 0, 0, 0,         // elf symbols entry 7 addralign
            0, 0, 0, 0,         // elf symbols entry 7 addralign
            0, 0, 0, 0,         // elf symbols entry 7 entsize
            0, 0, 0, 0,         // elf symbols entry 7 entsize
            17, 0, 0, 0,        // elf symbols entry 8 name
            3, 0, 0, 0,         // elf symbols entry 8 type
            0, 0, 0, 0,         // elf symbols entry 8 flags
            0, 0, 0, 0,         // elf symbols entry 8 flags
            113, 147, 17, 0,    // elf symbols entry 8 addr
            0, 0, 0, 0,         // elf symbols entry 8 addr
            113, 83, 1, 0,      // elf symbols entry 8 offset
            0, 0, 0, 0,         // elf symbols entry 8 offset
            65, 0, 0, 0,        // elf symbols entry 8 size
            0, 0, 0, 0,         // elf symbols entry 8 size
            0, 0, 0, 0,         // elf symbols entry 8 link
            0, 0, 0, 0,         // elf symbols entry 8 info
            1, 0, 0, 0,         // elf symbols entry 8 addralign
            0, 0, 0, 0,         // elf symbols entry 8 addralign
            0, 0, 0, 0,         // elf symbols entry 8 entsize
            0, 0, 0, 0,         // elf symbols entry 8 entsize
            0, 0, 0, 0,         // elf symbols padding
            4, 0, 0, 0,         // basic memory tag type
            16, 0, 0, 0,        // basic memory tag size
            127, 2, 0, 0,       // basic memory mem_lower
            128, 251, 1, 0,     // basic memory mem_upper
            5, 0, 0, 0,         // BIOS boot device tag type
            20, 0, 0, 0,        // BIOS boot device tag size
            224, 0, 0, 0,       // BIOS boot device biosdev
            255, 255, 255, 255, // BIOS boot device partition
            255, 255, 255, 255, // BIOS boot device subpartition
            0, 0, 0, 0,         // BIOS boot device padding
            8, 0, 0, 0,         // framebuffer info tag type
            32, 0, 0, 0,        // framebuffer info tag size
            0, 128, 11, 0,      // framebuffer info framebuffer_addr
            0, 0, 0, 0,         // framebuffer info framebuffer_addr
            160, 0, 0, 0,       // framebuffer info framebuffer_pitch
            80, 0, 0, 0,        // framebuffer info framebuffer_width
            25, 0, 0, 0,        // framebuffer info framebuffer_height
            16, 2, 0, 0,        // framebuffer info framebuffer_[bpp,type], reserved, color_info
            14, 0, 0, 0,        // ACPI old tag type
            28, 0, 0, 0,        // ACPI old tag size
            82, 83, 68, 32,     // ACPI old
            80, 84, 82, 32,     // ACPI old
            89, 66, 79, 67,     // ACPI old
            72, 83, 32, 0,      // ACPI old
            220, 24, 254, 7,    // ACPI old
            0, 0, 0, 0,         // ACPI old padding
            0, 0, 0, 0,         // end tag type
            8, 0, 0, 0,         // end tag size
        ]);
        #[repr(C, align(8))]
        struct StringBytes([u8; 65]);
        let string_bytes: StringBytes = StringBytes([
            0, 46, 115, 121,
            109, 116, 97, 98,
            0, 46, 115, 116,
            114, 116, 97, 98,
            0, 46, 115, 104,
            115, 116, 114, 116,
            97, 98, 0, 46,
            114, 111, 100, 97,
            116, 97, 0, 46,
            116, 101, 120, 116,
            0, 46, 100, 97,
            116, 97, 0, 46,
            98, 115, 115, 0,
            46, 100, 97, 116,
            97, 46, 114, 101,
            108, 46, 114, 111,
            0,
        ]);
        let string_addr = string_bytes.0.as_ptr() as u64;
        for i in 0..8 {
            bytes.0[796 + i] = (string_addr >> (i * 8)) as u8;
        }
        let addr = bytes.0.as_ptr() as usize;
        test_grub2_boot_info(
            unsafe { load(addr) },
            addr,
            string_addr,
            &bytes.0,
            &string_bytes.0,
        );
        test_grub2_boot_info(
            unsafe { load_with_offset(addr, 0) },
            addr,
            string_addr,
            &bytes.0,
            &string_bytes.0,
        );
        let offset = 8usize;
        for i in 0..8 {
            bytes.0[796 + i] = ((string_addr - offset as u64) >> (i * 8)) as u8;
        }
        test_grub2_boot_info(
            unsafe { load_with_offset(addr - offset, offset) },
            addr,
            string_addr - offset as u64,
            &bytes.0,
            &string_bytes.0,
        );
    }

    fn test_grub2_boot_info(
        bi: BootInformation,
        addr: usize,
        string_addr: u64,
        bytes: &[u8],
        string_bytes: &[u8],
    ) {
        assert_eq!(addr, bi.start_address());
        assert_eq!(addr + bytes.len(), bi.end_address());
        assert_eq!(bytes.len(), bi.total_size());
        let es = bi.elf_sections_tag().unwrap();
        let mut s = es.sections();
        let s1 = s.next().unwrap();
        assert_eq!(".rodata", s1.name());
        assert_eq!(0xFFFF_8000_0010_0000, s1.start_address());
        assert_eq!(0xFFFF_8000_0010_3000, s1.end_address());
        assert_eq!(0x0000_0000_0000_3000, s1.size());
        assert_eq!(ElfSectionFlags::ALLOCATED, s1.flags());
        assert_eq!(ElfSectionType::ProgramSection, s1.section_type());
        let s2 = s.next().unwrap();
        assert_eq!(".text", s2.name());
        assert_eq!(0xFFFF_8000_0010_3000, s2.start_address());
        assert_eq!(0xFFFF_8000_0010_C000, s2.end_address());
        assert_eq!(0x0000_0000_0000_9000, s2.size());
        assert_eq!(ElfSectionFlags::EXECUTABLE | ElfSectionFlags::ALLOCATED, s2.flags());
        assert_eq!(ElfSectionType::ProgramSection, s2.section_type());
        let s3 = s.next().unwrap();
        assert_eq!(".data", s3.name());
        assert_eq!(0xFFFF_8000_0010_C000, s3.start_address());
        assert_eq!(0xFFFF_8000_0010_E000, s3.end_address());
        assert_eq!(0x0000_0000_0000_2000, s3.size());
        assert_eq!(ElfSectionFlags::ALLOCATED | ElfSectionFlags::WRITABLE, s3.flags());
        assert_eq!(ElfSectionType::ProgramSection, s3.section_type());
        let s4 = s.next().unwrap();
        assert_eq!(".bss", s4.name());
        assert_eq!(0xFFFF_8000_0010_E000, s4.start_address());
        assert_eq!(0xFFFF_8000_0011_3000, s4.end_address());
        assert_eq!(0x0000_0000_0000_5000, s4.size());
        assert_eq!(ElfSectionFlags::ALLOCATED | ElfSectionFlags::WRITABLE, s4.flags());
        assert_eq!(ElfSectionType::Uninitialized, s4.section_type());
        let s5 = s.next().unwrap();
        assert_eq!(".data.rel.ro", s5.name());
        assert_eq!(0xFFFF_8000_0011_3000, s5.start_address());
        assert_eq!(0xFFFF_8000_0011_3000, s5.end_address());
        assert_eq!(0x0000_0000_0000_0000, s5.size());
        assert_eq!(ElfSectionFlags::ALLOCATED | ElfSectionFlags::WRITABLE, s5.flags());
        assert_eq!(ElfSectionType::ProgramSection, s5.section_type());
        let s6 = s.next().unwrap();
        assert_eq!(".symtab", s6.name());
        assert_eq!(0x0000_0000_0011_3000, s6.start_address());
        assert_eq!(0x0000_0000_0011_5BE0, s6.end_address());
        assert_eq!(0x0000_0000_0000_2BE0, s6.size());
        assert_eq!(ElfSectionFlags::empty(), s6.flags());
        assert_eq!(ElfSectionType::LinkerSymbolTable, s6.section_type());
        let s7 = s.next().unwrap();
        assert_eq!(".strtab", s7.name());
        assert_eq!(0x0000_0000_0011_5BE0, s7.start_address());
        assert_eq!(0x0000_0000_0011_9371, s7.end_address());
        assert_eq!(0x0000_0000_0000_3791, s7.size());
        assert_eq!(ElfSectionFlags::empty(), s7.flags());
        assert_eq!(ElfSectionType::StringTable, s7.section_type());
        let s8 = s.next().unwrap();
        assert_eq!(".shstrtab", s8.name());
        assert_eq!(string_addr, s8.start_address());
        assert_eq!(string_addr + string_bytes.len() as u64, s8.end_address());
        assert_eq!(string_bytes.len() as u64, s8.size());
        assert_eq!(ElfSectionFlags::empty(), s8.flags());
        assert_eq!(ElfSectionType::StringTable, s8.section_type());
        assert!(s.next().is_none());
        let mut mm = bi.memory_map_tag().unwrap().memory_areas();
        let mm1 = mm.next().unwrap();
        assert_eq!(0x00000000, mm1.start_address());
        assert_eq!(0x009_FC00, mm1.end_address());
        assert_eq!(0x009_FC00, mm1.size());
        let mm2 = mm.next().unwrap();
        assert_eq!(0x010_0000, mm2.start_address());
        assert_eq!(0x7FE_0000, mm2.end_address());
        assert_eq!(0x7EE_0000, mm2.size());
        assert!(mm.next().is_none());

        // Test the RSDP tag
        let rsdp_old = bi.rsdp_v1_tag().unwrap();
        assert_eq!("RSD PTR ", rsdp_old.signature().unwrap());
        assert_eq!(89, rsdp_old.checksum());
        assert_eq!("BOCHS ", rsdp_old.oem_id().unwrap());
        assert_eq!(0, rsdp_old.revision());
        assert_eq!(0x7FE18DC, rsdp_old.rsdt_address());

        assert!(bi.module_tags().next().is_none());
        assert_eq!("GRUB 2.02~beta3-5", bi.boot_loader_name_tag().unwrap().name());
        assert_eq!("", bi.command_line_tag().unwrap().command_line());

        // Test the Framebuffer tag
        let fbi = bi.framebuffer_tag().unwrap();
        assert_eq!(fbi.address, 753664);
        assert_eq!(fbi.pitch, 160);
        assert_eq!(fbi.width, 80);
        assert_eq!(fbi.height, 25);
        assert_eq!(fbi.bpp, 16);
        assert_eq!(fbi.buffer_type, FramebufferType::Text);
    }

    #[test]
    fn elf_sections() {
        #[repr(C, align(8))]
        struct Bytes([u8; 168]);
        let mut bytes: Bytes = Bytes([
            168, 0, 0, 0,       // total_size
            0, 0, 0, 0,         // reserved
            9, 0, 0, 0,         // elf symbols tag type
            20, 2, 0, 0,        // elf symbols tag size
            2, 0, 0, 0,         // elf symbols num
            64, 0, 0, 0,        // elf symbols entsize
            1, 0, 0, 0,         // elf symbols shndx
            0, 0, 0, 0,         // elf symbols entry 0 name
            0, 0, 0, 0,         // elf symbols entry 0 type
            0, 0, 0, 0,         // elf symbols entry 0 flags
            0, 0, 0, 0,         // elf symbols entry 0 flags
            0, 0, 0, 0,         // elf symbols entry 0 addr
            0, 0, 0, 0,         // elf symbols entry 0 addr
            0, 0, 0, 0,         // elf symbols entry 0 offset
            0, 0, 0, 0,         // elf symbols entry 0 offset
            0, 0, 0, 0,         // elf symbols entry 0 size
            0, 0, 0, 0,         // elf symbols entry 0 size
            0, 0, 0, 0,         // elf symbols entry 0 link
            0, 0, 0, 0,         // elf symbols entry 0 info
            0, 0, 0, 0,         // elf symbols entry 0 addralign
            0, 0, 0, 0,         // elf symbols entry 0 addralign
            0, 0, 0, 0,         // elf symbols entry 0 entsize
            0, 0, 0, 0,         // elf symbols entry 0 entsize
            1, 0, 0, 0,         // elf symbols entry 1 name
            3, 0, 0, 0,         // elf symbols entry 1 type
            0, 0, 0, 0,         // elf symbols entry 1 flags
            0, 0, 0, 0,         // elf symbols entry 1 flags
            255, 255, 255, 255, // elf symbols entry 1 addr
            255, 255, 255, 255, // elf symbols entry 1 addr
            113, 83, 1, 0,      // elf symbols entry 1 offset
            0, 0, 0, 0,         // elf symbols entry 1 offset
            11, 0, 0, 0,        // elf symbols entry 1 size
            0, 0, 0, 0,         // elf symbols entry 1 size
            0, 0, 0, 0,         // elf symbols entry 1 link
            0, 0, 0, 0,         // elf symbols entry 1 info
            1, 0, 0, 0,         // elf symbols entry 1 addralign
            0, 0, 0, 0,         // elf symbols entry 1 addralign
            0, 0, 0, 0,         // elf symbols entry 1 entsize
            0, 0, 0, 0,         // elf symbols entry 1 entsize
            0, 0, 0, 0,         // elf symbols padding
            0, 0, 0, 0,         // end tag type
            8, 0, 0, 0,         // end tag size
        ]);
        #[repr(C, align(8))]
        struct StringBytes([u8; 11]);
        let string_bytes: StringBytes = StringBytes([
            0, 46, 115, 104,
            115, 116, 114, 116,
            97, 98, 0,
        ]);
        let string_addr = string_bytes.0.as_ptr() as u64;
        for i in 0..8 {
            let offset = 108;
            assert_eq!(255, bytes.0[offset + i]);
            bytes.0[offset + i] = (string_addr >> (i * 8)) as u8;
        }
        let addr = bytes.0.as_ptr() as usize;
        let bi = unsafe { load(addr) };
        assert_eq!(addr, bi.start_address());
        assert_eq!(addr + bytes.0.len(), bi.end_address());
        assert_eq!(bytes.0.len(), bi.total_size() as usize);
        let es = bi.elf_sections_tag().unwrap();
        let mut s = es.sections();
        let s1 = s.next().unwrap();
        assert_eq!(".shstrtab", s1.name());
        assert_eq!(string_addr, s1.start_address());
        assert_eq!(string_addr + string_bytes.0.len() as u64, s1.end_address());
        assert_eq!(string_bytes.0.len() as u64, s1.size());
        assert_eq!(ElfSectionFlags::empty(), s1.flags());
        assert_eq!(ElfSectionType::StringTable, s1.section_type());
        assert!(s.next().is_none());
    }
}