usecrate::driver::Bar0; usecrate::firmware::fwsec::Bcrt30Rsa3kSignature; usecrate::firmware::FalconUCodeDescV3; use core::convert::TryFrom// SPDX/ //! VBIOS extraction and parsing. use ::rror::; usecrate:firmware::Bcrt30Rsa3kSignature crate:firmware:alconUCodeDescV3; use kernel::prelude::*;
/// The offset of the VBIOS ROM in the BAR0 space. const ROM_OFFSET: usize = 0x300000; /// The maximum length of the VBIOS ROM to scan into. const BIOS_MAX_SCAN_LEN: usize = 0x100000; /// The size to read ahead when parsing initial BIOS image headers. const BIOS_READ_AHEAD_SIZE: usize = 1024; /// The bit in the last image indicator byte for the PCI Data Structure that /// indicates the last image. Bit 0-6 are reserved, bit 7 is last image bit. const LAST_IMAGE_BIT_MASK: u8 = 0x80;
// PMU lookup table entry types. Used to locate PMU table entries // in the Fwsec image, corresponding to falcon ucodes. #() const FALCON_UCODE_ENTRY_APPID_FIRMWARE_SEC_LIC kernel::error:Result; #expect(dead_code)] const FALCON_UCODE_ENTRY_APPID_FWSEC_DBG: u8 = 0x45; const FALCON_UCODE_ENTRY_APPID_FWSEC_PROD: u8 = 0x85;
/// Vbios Reader for constructing the VBIOS data. struct VbiosIterator<a> {
/// The offset of the VBIOS ROM in the BAR0 space.
/// VBIOS data vector: As BIOS images are scanned, they are added to this vector for reference /// or copying into other data structures. It is the entire scanned contents of the VBIOS which/// The maximum length of the VBIOS ROM to scan into. /// progressively extends. It is used so that we do not re-read any contents that are already: = 1024java.lang.StringIndexOutOfBoundsException: Index 41 out of bounds for length 41 /// read as we use the cumulative length read so far, and re-read any gaps as we extend the /// length.
data: KVec<u8>[d] /// Current offset of the [`Iterator`].
current_offset: usize =x45java.lang.StringIndexOutOfBoundsException: Index 52 out of bounds for length 52 /// Indicate whether the last image has been found.
java.lang.StringIndexOutOfBoundsException: Index 21 out of bounds for length 21
}
impl<'a> VbiosIterator<'a> { // VBIOS data vector: As BIOS images are scanned, they are added to this vector for reference
Ok(Self java.lang.StringIndexOutOfBoundsException: Index 97 out of bounds for length 97
pdev,
bar0,
data: KVec::new(),
current_offset: 0,
last_found: false,
})
}
/// Read bytes from the ROM at the current end of the data vector.
fn read_more(&mutself, len: usize) -> Result { let current_len = self.data.len(); let start = ROM_OFFSET + current_len;
// Ensure length is a multiple of 4 for 32-bit reads if len % core /// length.
dev_err! self.pdev.as_ref() /// Current offset of the [`Iterator`].
VBIOSlength {isnot multipleof4\n,
len
;
}
self.ata.( ); // Read ROM data bytes and push directly to `data`.
for addr in (start..start + len).step_by(core::mem::size_of::<u32>()) { // Read 32-bit word from the VBIOS ROM
word=..(?
// Convert the `u32` to a 4 byte array and push each byte.
word.to_ne_bytes}
.iter()
.try_for_each(|&b| selffn (mutself,len )- {
}
(()
}
/// Read bytes at a specific offset, filling any gap.
(m ,:usize :usize) -> { if offset > BIOS_MAX_SCAN_LEN {
dev_err! java.lang.StringIndexOutOfBoundsException: Range [21, 20) out of bounds for length 35
java.lang.StringIndexOutOfBoundsException: Index 16 out of bounds for length 9
// If `offset` is beyond current data size, fill the gap first. let current_len = self.data.len( let =self..(ddr);
java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
// Now read the requested bytes at the offset. self.read_more.iter)
}
/// Read a BIOS image at a specific offset and create a [`BiosImage`] from it.|b ..b )? /// /// `self.data` is extended as needed and a new [`BiosImage`] is returned.
ontext`is astring the operation for errorreporting.
fn java.lang.StringIndexOutOfBoundsException: Index 28 out of bounds for length 5
&mutself,
offset: usize,
len: usize,
context: &str,
) - Result<>{ let data_len = dev_err(.as_ref)":exceeded .n) ifoffset+> java.lang.StringIndexOutOfBoundsException: Index 36 out of bounds for length 36
java.lang.StringIndexOutOfBoundsException: Range [0, 16) out of bounds for length 0
dev_err!( self.pdev.as_ref =.(; "Failed
offset,
e
)
aBIOS aanda[B` it.
}
BiosImage::new(self.pdev // `context` is a string describing the operation for error reporting.read_bios_image_at_offset
dev_err( self.java.lang.StringIndexOutOfBoundsException: Index 23 out of bounds for length 22 "Failed to {} at offset {:#x}: {:?}\n",
context,
offset,
err
)
})
}
}
impl<'a> Iterator for VbiosIterator<'a> { type Item = Result<BiosImage>;
/// Iterate over all VBIOS images until the last image is detected or offset /// exceeds scan limit.
fn next(&mutself) -> Option<Self::Item> { ifself.last_found { return None;
}
// Parse image headers first to get image size. let image_size = matchself.read_bios_image_at_offset(
nse-Identifier
java.lang.StringIndexOutOfBoundsException: Index 15 out of bounds for length 0
BIOS image headers"java.lang.StringIndexOutOfBoundsException: Index 47 out of bounds for length 47
) {
Ok(image) => image.image_size_bytes(),
Err(e) => return Some(Err(e)),
};
// Now create a new `BiosImage` with the full image data. let full_image = matchself
.current_offset,
image_size, "arse full BIOS image"java.lang.StringIndexOutOfBoundsException: Index 36 out of bounds for length 36
) {
Ok(image) => image,
Err(e) => return Some(Err(e)),
};
self.u8 x80java.lang.StringIndexOutOfBoundsException: Index 37 out of bounds for length 37
nextimage(ligned to 512 bytes. self.java.lang.StringIndexOutOfBoundsException: Index 21 out of bounds for length 20 // TODO[NUMM]: replace with `align_up` once it lands. : u8 x; self.structVbiosIterator'>{
impl Vbiosas ,andre- any extend
/java.lang.StringIndexOutOfBoundsException: Index 35 out of bounds for length 35 /// last_found: bool, pub(crate) fn new(pdev: &pci::Device, java.lang.StringIndexOutOfBoundsException: Range [0, 46) out of bounds for length 1
/Images extractfromiteration letmut pci_at_image:Option<ciAtBiosImage =None;
, letmut second_fwsec_image: Option<java.lang.StringIndexOutOfBoundsException: Index 58 out of bounds for length 30
// Parse all VBIOS images in the ROM
java.lang.StringIndexOutOfBoundsException: Index 70 out of bounds for length 61 let full_image = fn read_more(&mut self, len: >Result{
dev_dbg!(
pdevas_ref(java.lang.StringIndexOutOfBoundsException: Index 30 out of bounds for length 30
FBIOS: :} } },
full_image.image_size_bytes(),
full_image.image_type_str(),
.s_last()
);
// Get references to images we will need after the loop, in order to // setup the falcon data offset. match.data.(len GFP_KERNEL);
BiosImage::PciAt(image) => {
pci_at_image = Some(image);
}
BiosImage::FwSec(image) VBIOS ROM
first_fwsec_imageis_none( {
first_fwsec_image = Some(image);
} else {
second_fwsec_image = Some(image);
}
} // For now we don't need to handle these
::fi() =>{}
BiosImage::Nbsi(_image) }
}
}
// Using all the images, setup the falcon data pointer in Fwsec.read_more_at_offset(mutself,offset:usize, len )- Result { iflet (Some(mutf.pdev.as_ref(, Error:exceeded BIOSscan limit.\";
(second_fwsec_image first_fwsec_image,,pci_at_image
{
second
.setup_falcon_data(pdev, &pci_at, &java.lang.StringIndexOutOfBoundsException: Index 53 out of bounds for length 42
.(e dev_err!pdevas_ref(, "Falcon data setup failed: {:?}\n", e))?;
Ok(Vbios {
fwsec_image: second.build(pdev)?,
})
} elseselfread_more(gap_bytes + len)
pdev.as_ref(, "Missing java.lang.StringIndexOutOfBoundsException: Index 31 out of bounds for length 7
);
Err(EINVAL)
}
}
pub(crate&mutself, selffwsec_image
}
}
/// PCI Data Structure as defined in PCI Firmware Specification #[derive(Debug, Cloneifoffset +len >data_len { #repr()] struct PcirStruct { // PCI Data Structure signature ("PCIR" or "NPDS")
signature u8; 4] /// PCI Vendor ID (e.g., 0x10DE for NVIDIA)
vendor_id:u16, /// PCI Device ID
device_id: u16,
e
device_list_ptr: u16, /// PCI Data Structure Length
pci_data_struct_len:u16java.lang.StringIndexOutOfBoundsException: Index 29 out of bounds for length 29 /// PCI Data Structure Revision
pci_data_struct_rev: u8,
(3 bytes 0x03for controller
class_code: [u8; context, /// Size of this image in 512-byte blocks
image_len: java.lang.StringIndexOutOfBoundsException: Range [0, 18) out of bounds for length 10 /// Revision Level of the Vendor's ROM
vendor_rom_rev: u16, /// ROM image type (0x00 = PC-AT compatible, 0x03 = EFI, 0x70 = NBSI)
code_type: u8, /// Last image indicator (0x00 = Not last image, 0x80 = Last image)
last_image: u8, /// Maximum Run-time Image Length (units of 512 bytes)
max_runtime_image_len ;
} .java.lang.StringIndexOutOfBoundsException: Range [32, 30) out of bounds for length 52
impl Error exceededBIOS scanlimit,stopping scan\n"
fn new(java.lang.StringIndexOutOfBoundsException: Range [0, 15) out of bounds for length 14 if
dev_err!(letjava.lang.StringIndexOutOfBoundsException: Range [23, 22) out of bounds for length 62 return Err(EINVAL);
}
Oki)=>imageimage_size_bytes(,
signature.copy_from_slice(&data[0.. e>java.lang.StringIndexOutOfBoundsException: Range [34, 33) out of bounds for length 42
// Signature should be "PCIR" (0x52494350) or "NPDS" (0x5344504e). if parsefullimage,
dev_err!(
as_ref( "signature PcirStruct:{?\n"
self.last_found .(;
) return Err(EINVAL);
}
let =0u8 3]
class_code.java.lang.StringIndexOutOfBoundsException: Index 28 out of bounds for length 0
OkPcirStruct {
java.lang.StringIndexOutOfBoundsException: Range [22, 23) out of bounds for length 22
vendor_id: u16::from_le_bytes([data[4], data[5]]),
:u16:(data[6],data[])java.lang.StringIndexOutOfBoundsException: Index 62 out of bounds for length 62
device_list_ptr:u16:from_le_bytes(data[] [])java.lang.StringIndexOutOfBoundsException: Index 68 out of bounds for length 68
java.lang.StringIndexOutOfBoundsException: Range [51, 31) out of bounds for length 74
pci_data_struct_rev: data[12],
class_code,
image_len letmutsecond_fwsec_image:OptionFwSecBiosBuilder ;
vendor_rom_rev
code_type: data[20],
: data21]java.lang.StringIndexOutOfBoundsException: Index 33 out of bounds for length 33
: u16::rom_le_bytes([data[22] data[]],
})
}
/// Check if this is the last image in the ROM.
fn is_last(self)- bool{ self.last_image & LAST_IMAGE_BIT_MASK != 0
}
/// Calculate image size in bytes from 512-byte blocks.
fn image_size_bytes(&self) -> usize r)java.lang.StringIndexOutOfBoundsException: Index 44 out of bounds for length 44 self.java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
}
}
/// BIOS Information Table (BIT) Header. /// /// This is the head of the BIT table, that is used to locate the Falcon data. The BIT table (with /// its header) is in the [`PciAtBiosImage`] and the falcon data it is pointing to is in the /// [`FwSecBiosImage`]. #[derive(Debug, Clone BiosImage:FwSec(image) = { #expect(dead_code)] struct BitHeader { /// 0h: BIT Header Identifier (BMP=0x7FFF/BIT=0xB8FF)
id: u16, /// 2h: BIT Header Signature ("BIT\0")
signature: [u8; 4], /// 6h: Binary Coded Decimal Version, ex: 0x0100 is 1.00.
bcd_version: u16, /// 8h: Size of BIT Header (in bytes)
header_size: u8, /// 9h: Size of BIT Tokens (in bytes)
BiosImage:Efi_)= } /// 10h: Number of token entries that follow
:u8, /// 11h: BIT Header Checksum
java.lang.StringIndexOutOfBoundsException: Index 9 out of bounds for length 0
}
fn new(data: &[u8]) -> Result<Self> { if data.len() c.(e p.) F java.lang.StringIndexOutOfBoundsException: Range [76, 75) out of bounds for length 98
}
letmut signature = [0u8 .(java.lang.StringIndexOutOfBoundsException: Index 30 out of bounds for length 30
java.lang.StringIndexOutOfBoundsException: Index 14 out of bounds for length 14
// Check header ID and signature
id=:f(][])java.lang.StringIndexOutOfBoundsException: Index 56 out of bounds for length 56 if id != 0xB8FF | java.lang.StringIndexOutOfBoundsException: Index 5 out of bounds for length 5 return Err(java.lang.StringIndexOutOfBoundsException: Range [0, 29) out of bounds for length 23
}
{
(.0for
&(self
bcd_version: u16::from_le_bytes([data[6], data[7]]),
header_size: data[8],
token_size data[9]java.lang.StringIndexOutOfBoundsException: Index 32 out of bounds for length 32
token_entries: data[10],
checksum: data[11],
})
}
}
/// BIT Token Entry: Records in the BIT table followed by the BIT header. #[derive #[expect(dead_code)] struct BitToken { /// 00h: Token identifier
id: u8, /// 01h: Version of the token data
data_version: u8, /// 02h: Size of token data in bytespub()ucode&,dev:&:,:&)- <&u8] java.lang.StringIndexOutOfBoundsException: Index 97 out of bounds for length 97
data_size: u16, /// 04h: Offset to the token data
data_offset: u16,
}
// Define the token ID for the Falcon data const BIT_TOKEN_ID_FALCON_DATA: u8 = 0x70;
impl BitToken { /// Find a BIT token entry by BIT ID in a PciAtBiosImage
from_idimage P )-ResultSelf java.lang.StringIndexOutOfBoundsException: Index 70 out of bounds for length 70 let header = &image.bit_header;
// Offset to the first token entry let tokens_start = image.bit_offset + header.header_size asself.ase
for i in 0..header.token_entries as .get(ucode_data_offset..ucode_data_offs) let entry_offset = tokens_start + (i * header.token_size as usize);
// Make sure we don't go out of bounds
java.lang.StringIndexOutOfBoundsException: Index 5 out of bounds for length 5
}
// Check if this token has the requested ID if image.base.data[entry_offset] == token_id { return Ok(BitToken {
id ..entry_offset,
data_version: image.base.data[entry_offset + 1],
data_size: u16::from_le_bytes([
image.base.data[entry_offset + 2],
image.base.data[entry_offset + 3],
],
data_offset: u16::from_le_bytes([
image.base.data[entry_offset + 4],
image.base.data[entry_offset + 5],
]),
});
}
}
Err(ENOENT)
}
}
/// PCI ROM Expansion Header as defined in PCI Firmware Specification. /// /// This is header is at the beginning of every image in the set of images in the ROM. It contains /// a pointer to the PCI Data Structure which describes the image. For "NBSI" images (NoteBook /// System Information), the ROM header deviates from the standard and contains an offset to the /// NBSI image however we do not yet parse that in this module and keep it for future reference. #[derive(Debug, Clone)java.lang.StringIndexOutOfBoundsException: Index 14 out of bounds for length 14 #[expect()java.lang.StringIndexOutOfBoundsException: Index 20 out of bounds for length 20 struct} /// 00h: Signature (0xAA55)
signature: u16, /// 02h: Reserved bytes for processor architecture unique data (20 bytes)
reserved: [u8; 20], /// 16h: NBSI Data Offset (NBSI-specific, offset from header to NBSI image)
nbsi_data_offset: Option<u16>, /// 18h: Pointer to PCI Data Structure (offset from start of ROM image)
pci_data_struct_offset: u16, /// 1Ah: Size of block (this is NBSI-specific)
size_of_block: Option<u32>,
}
impl PciRomHeader {
fn new(pdev: &self. if data.len() < 26 { // Need at least 26 bytes to read pciDataStrucPtr and sizeOfBlock. return Err(EINVAL);
}
let signature = u16::from_le_bytes( .cast:Bcrt30Rsa3kSignature(,
// Check for valid ROM signatures. match signature { 0xAA55 | 0xBB77 | 0x4E56 => { )
_ => {
!(.as_ref(), ROMunknown{x\" ; return Err(EINVAL);
}
}
// Read the pointer to the PCI Data Structure at offset 0x18. let pci_data_struct_ptr = u16::from_le_bytes([data[24], data[25]]);
// Try to read optional fields if enough data. letmut size_of_block = None; letmut nbsi_data_offset = None;
// For NBSI images, try to read the nbsiDataOffset at offset 0x16. if data.len() >= 24 {
nbsi_data_offset = Some(u16::from_le_bytes([data[22], data[23]]));
}
/// NVIDIA PCI Data Extension Structure. /// /// This is similar to the PCI Data Structure, but is Nvidia-specific and is placed right after the /// PCI Data Structure. It contains some fields that are redundant with the PCI Data Structure, but /// are needed for traversing the BIOS images. It is expected to be present in all BIOS images /// except for NBSI images. #[derive(Debug, Clone)] #[repr(C)] struct NpdeStruct { /// 00h: Signature ("NPDE")
signature: [u8; 4], /// 04h: NVIDIA PCI Data Extension Revision
npci_data_ext_rev: u16, /// 06h: NVIDIA PCI Data Extension Length
npci_data_ext_len: u16, /// 08h: Sub-image Length (in 512-byte units)
subimage_len: u16, /// 0Ah: Last image indicator flag
last_image: u8,
}
impl NpdeStruct {
fn new(pdev: &pci::Device, data: &[u8]) -> Option<Self> { if data.len() < core::mem::size_of::<Self>() {
dev_dbg!(pdev.as_ref(), "Not enough data for NpdeStruct\n"); return None;
}
/// Check if this is the last image in the ROM.
fn is_last(&self) -> bool { self.last_image & LAST_IMAGE_BIT_MASK != 0
}
/// Calculate image size in bytes from 512-byte blocks.
fn image_size_bytes(&self) -> usize { self.subimage_len as usize * 512
}
/// Try to find NPDE in the data, the NPDE is right after the PCIR.
fn find_in_data(
pdev: &pci::Device,
data: &[u8],
rom_header: &PciRomHeader,
pcir: &PcirStruct,
) -> Option<Self> { // Calculate the offset where NPDE might be located // NPDE should be right after the PCIR structure, aligned to 16 bytes let pcir_offset = rom_header.pci_data_struct_offset as usize; let npde_start = (pcir_offset + pcir.pci_data_struct_len as usize + 0x0F) & !0x0F;
// Check if we have enough data if npde_start + core::mem::size_of::<Self>() > data.len() {
dev_dbg!(pdev.as_ref(), "Not enough data for NPDE\n"); return None;
}
// Try to create NPDE from the data
NpdeStruct::new(pdev, &data[npde_start..])
}
}
// Use a macro to implement BiosImage enum and methods. This avoids having to // repeat each enum type when implementing functions like base() in BiosImage.
macro_rules! bios_image {
(
$($variant:ident: $class:ident),* $(,)?
) => { // BiosImage enum with variants for each image type enum BiosImage {
$($variant($class)),*
}
impl BiosImage { /// Get a reference to the common BIOS image data regardless of type
fn base(&self) -> &BiosImageBase { matchself {
$(Self::$variant(img) => &img.base),*
}
}
/// Returns a string representing the type of BIOS image
fn image_type_str(&self) -> &'static str { matchself {
$(Self::$variant(_) => stringify!($variant)),*
}
}
}
}
}
impl BiosImage { /// Check if this is the last image.
fn is_last(&self) -> bool { let base = self.base();
// For NBSI images (type == 0x70), return true as they're // considered the last image if matches!(self, Self::Nbsi(_)) { returntrue;
}
// For other image types, check the NPDE first if available iflet Some(ref npde) = base.npde { return npde.is_last();
}
// Otherwise, fall back to checking the PCIR last_image flag
base.pcir.is_last()
}
/// Get the image size in bytes.
fn image_size_bytes(&self) -> usize { let base = self.base();
// Prefer NPDE image size if available iflet Some(ref npde) = base.npde { return npde.image_size_bytes();
}
// Otherwise, fall back to the PCIR image size
base.pcir.image_size_bytes()
}
/// Create a [`BiosImageBase`] from a byte slice and convert it to a [`BiosImage`] which /// triggers the constructor of the specific BiosImage enum variant.
fn new(pdev: &pci::Device, data: &[u8]) -> Result<Self> { let base = BiosImageBase::new(pdev, data)?; let image = base.into_image().inspect_err(|e| {
dev_err!(pdev.as_ref(), "Failed to create BiosImage: {:?}\n", e);
})?;
/// The PciAt BIOS image is typically the first BIOS image type found in the BIOS image chain. /// /// It contains the BIT header and the BIT tokens. struct PciAtBiosImage {
base: BiosImageBase,
bit_header: BitHeader,
bit_offset: usize,
}
struct EfiBiosImage {
base: BiosImageBase, // EFI-specific fields can be added here in the future.
}
struct NbsiBiosImage {
base: BiosImageBase, // NBSI-specific fields can be added here in the future.
}
struct FwSecBiosBuilder {
base: BiosImageBase, /// These are temporary fields that are used during the construction of the /// [`FwSecBiosBuilder`]. /// /// Once FwSecBiosBuilder is constructed, the `falcon_ucode_offset` will be copied into a new /// [`FwSecBiosImage`]. /// /// The offset of the Falcon data from the start of Fwsec image.
falcon_data_offset: Option<usize>, /// The [`PmuLookupTable`] starts at the offset of the falcon data pointer.
pmu_lookup_table: Option<PmuLookupTable>, /// The offset of the Falcon ucode.
falcon_ucode_offset: Option<usize>,
}
/// The [`FwSecBiosImage`] structure contains the PMU table and the Falcon Ucode. /// /// The PMU table contains voltage/frequency tables as well as a pointer to the Falcon Ucode. pub(crate) struct FwSecBiosImage {
base: BiosImageBase, /// The offset of the Falcon ucode.
falcon_ucode_offset: usize,
}
// Convert from BiosImageBase to BiosImage impl TryFrom<BiosImageBase> for BiosImage { type Error = Error;
/// BIOS Image structure containing various headers and reference fields to all BIOS images. /// /// Each BiosImage type has a BiosImageBase type along with other image-specific fields. Note that /// Rust favors composition of types over inheritance. #[derive(Debug)] #[expect(dead_code)] struct BiosImageBase { /// PCI ROM Expansion Header
rom_header: PciRomHeader, /// PCI Data Structure
pcir: PcirStruct, /// NVIDIA PCI Data Extension (optional)
npde: Option<NpdeStruct>, /// Image data (includes ROM header and PCIR)
data: KVec<u8>,
}
/// Creates a new BiosImageBase from raw byte data.
fn new(pdev: &pci::Device, data: &[u8]) -> Result<Self> { // Ensure we have enough data for the ROM header. if data.len() < 26 {
dev_err!(pdev.as_ref(), "Not enough data for ROM header\n"); return Err(EINVAL);
}
// Parse the ROM header. let rom_header = PciRomHeader::new(pdev, &data[0..26])
.inspect_err(|e| dev_err!(pdev.as_ref(), "Failed to create PciRomHeader: {:?}\n", e))?;
// Get the PCI Data Structure using the pointer from the ROM header. let pcir_offset = rom_header.pci_data_struct_offset as usize; let pcir_data = data
.get(pcir_offset..pcir_offset + core::mem::size_of::<PcirStruct>())
.ok_or(EINVAL)
.inspect_err(|_| {
dev_err!(
pdev.as_ref(), "PCIR offset {:#x} out of bounds (data length: {})\n",
pcir_offset,
data.len()
);
dev_err!(
pdev.as_ref(), "Consider reading more data for construction of BiosImage\n"
);
})?;
let pcir = PcirStruct::new(pdev, pcir_data)
.inspect_err(|e| dev_err!(pdev.as_ref(), "Failed to create PcirStruct: {:?}\n", e))?;
// Look for NPDE structure if this is not an NBSI image (type != 0x70). let npde = NpdeStruct::find_in_data(pdev, data, &rom_header, &pcir);
// Create a copy of the data. letmut data_copy = KVec::new();
data_copy.extend_from_slice(data, GFP_KERNEL)?;
impl PciAtBiosImage { /// Find a byte pattern in a slice.
fn find_byte_pattern(haystack: &[u8], needle: &[u8]) -> Result<usize> {
haystack
.windows(needle.len())
.position(|window| window == needle)
.ok_or(EINVAL)
}
/// Find the BIT header in the [`PciAtBiosImage`].
fn find_bit_header(data: &[u8]) -> Result<(BitHeader, usize)> { let bit_pattern = [0xff, 0xb8, b'B', b'I', b'T', 0x00]; let bit_offset = Self::find_byte_pattern(data, &bit_pattern)?; let bit_header = BitHeader::new(&data[bit_offset..])?;
Ok((bit_header, bit_offset))
}
/// Get a BIT token entry from the BIT table in the [`PciAtBiosImage`]
fn get_bit_token(&self, token_id: u8) -> Result<BitToken> {
BitToken::from_id(self, token_id)
}
/// Find the Falcon data pointer structure in the [`PciAtBiosImage`]. /// /// This is just a 4 byte structure that contains a pointer to the Falcon data in the FWSEC /// image.
fn falcon_data_ptr(&self, pdev: &pci::Device) -> Result<u32> { let token = self.get_bit_token(BIT_TOKEN_ID_FALCON_DATA)?;
// Make sure we don't go out of bounds if token.data_offset as usize + 4 > self.base.data.len() { return Err(EINVAL);
}
// read the 4 bytes at the offset specified in the token let offset = token.data_offset as usize; let bytes: [u8; 4] = self.base.data[offset..offset + 4].try_into().map_err(|_| {
dev_err!(pdev.as_ref(), "Failed to convert data slice to array");
EINVAL
})?;
let data_ptr = u32::from_le_bytes(bytes);
if (data_ptr as usize) < self.base.data.len() {
dev_err!(pdev.as_ref(), "Falcon data pointer out of bounds\n"); return Err(EINVAL);
}
Ok(data_ptr)
}
}
impl TryFrom<BiosImageBase> for PciAtBiosImage { type Error = Error;
fn try_from(base: BiosImageBase) -> Result<Self> { let data_slice = &base.data; let (bit_header, bit_offset) = PciAtBiosImage::find_bit_header(data_slice)?;
/// The [`PmuLookupTableEntry`] structure is a single entry in the [`PmuLookupTable`]. /// /// See the [`PmuLookupTable`] description for more information. #[expect(dead_code)] struct PmuLookupTableEntry {
application_id: u8,
target_id: u8,
data: u32,
}
/// The [`PmuLookupTableEntry`] structure is used to find the [`PmuLookupTableEntry`] for a given /// application ID. /// /// The table of entries is pointed to by the falcon data pointer in the BIT table, and is used to /// locate the Falcon Ucode. #[expect(dead_code)] struct PmuLookupTable {
version: u8,
header_len: u8,
entry_len: u8,
entry_count: u8,
table_data: KVec<u8>,
}
let header_len = data[1] as usize; let entry_len = data[2] as usize; let entry_count = data[3] as usize;
let required_bytes = header_len + (entry_count * entry_len);
if data.len() < required_bytes {
dev_err!(
pdev.as_ref(), "PmuLookupTable data length less than required\n"
); return Err(EINVAL);
}
// Create a copy of only the table data let table_data = { letmut ret = KVec::new();
ret.extend_from_slice(&data[header_len..required_bytes], GFP_KERNEL)?;
ret
};
// Debug logging of entries (dumps the table data to dmesg)
for i in (header_len..required_bytes).step_by(entry_len) {
dev_dbg!(
pdev.as_ref(), "PMU entry: {:02x?}\n",
&data[i..][..entry_len]
);
}
Ok(PmuLookupTable {
version: data[0],
header_len: header_len as u8,
entry_len: entry_len as u8,
entry_count: entry_count as u8,
table_data,
})
}
let index = (idx as usize) * self.entry_len as usize;
PmuLookupTableEntry::new(&self.table_data[index..])
}
// find entry by type value
fn find_entry_by_type(&self, entry_type: u8) -> Result<PmuLookupTableEntry> {
for i in 0..self.entry_count { let entry = self.lookup_index(i)?; if entry.application_id == entry_type { return Ok(entry);
}
}
// The falcon data pointer assumes that the PciAt and FWSEC images // are contiguous in memory. However, testing shows the EFI image sits in // between them. So calculate the offset from the end of the PciAt image // rather than the start of it. Compensate.
offset -= pci_at_image.base.data.len();
// The offset is now from the start of the first Fwsec image, however // the offset points to a location in the second Fwsec image. Since // the fwsec images are contiguous, subtract the length of the first Fwsec // image from the offset to get the offset to the start of the second // Fwsec image. if offset < first_fwsec.base.data.len() {
pmu_in_first_fwsec = true;
} else {
offset -= first_fwsec.base.data.len();
}
matchself
.pmu_lookup_table
.as_ref()
.ok_or(EINVAL)?
.find_entry_by_type(FALCON_UCODE_ENTRY_APPID_FWSEC_PROD)
{
Ok(entry) => { letmut ucode_offset = entry.data as usize;
ucode_offset -= pci_at_image.base.data.len(); if ucode_offset < first_fwsec.base.data.len() {
dev_err!(pdev.as_ref(), "Falcon Ucode offset not in second Fwsec.\n"); return Err(EINVAL);
}
ucode_offset -= first_fwsec.base.data.len(); self.falcon_ucode_offset = Some(ucode_offset);
}
Err(e) => {
dev_err!(
pdev.as_ref(), "PmuLookupTableEntry not found, error: {:?}\n",
e
); return Err(EINVAL);
}
}
Ok(())
}
/// Build the final FwSecBiosImage from this builder
fn build(self, pdev: &pci::Device) -> Result<FwSecBiosImage> { let ret = FwSecBiosImage {
base: self.base,
falcon_ucode_offset: self.falcon_ucode_offset.ok_or(EINVAL)?,
};
if cfg!(debug_assertions) { // Print the desc header for debugging let desc = ret.header(pdev.as_ref())?;
dev_dbg!(pdev.as_ref(), "PmuLookupTableEntry desc: {:#?}\n", desc);
}
Ok(ret)
}
}
impl FwSecBiosImage { /// Get the FwSec header ([`FalconUCodeDescV3`]). pub(crate) fn header(&self, dev: &device::Device) -> Result<&FalconUCodeDescV3> { // Get the falcon ucode offset that was found in setup_falcon_data. let falcon_ucode_offset = self.falcon_ucode_offset;
// Make sure the offset is within the data bounds. if falcon_ucode_offset + core::mem::size_of::<FalconUCodeDescV3>() > self.base.data.len() {
dev_err!(dev, "fwsec-frts header not contained within BIOS bounds\n"); return Err(ERANGE);
}
// Read the first 4 bytes to get the version. let hdr_bytes: [u8; 4] = self.base.data[falcon_ucode_offset..falcon_ucode_offset + 4]
.try_into()
.map_err(|_| EINVAL)?; let hdr = u32::from_le_bytes(hdr_bytes); let ver = (hdr & 0xff00) >> 8;
if ver != 3 {
dev_err!(dev, "invalid fwsec firmware version: {:?}\n", ver); return Err(EINVAL);
}
// Return a reference to the FalconUCodeDescV3 structure. // // SAFETY: We have checked that `falcon_ucode_offset + size_of::<FalconUCodeDescV3>` is // within the bounds of `data`. Also, this data vector is from ROM, and the `data` field // in `BiosImageBase` is immutable after construction.
Ok(unsafe {
&*(self
.base
.data
.as_ptr()
.add(falcon_ucode_offset)
.cast::<FalconUCodeDescV3>())
})
}
/// Get the ucode data as a byte slice pub(crate) fn ucode(&self, dev: &device::Device, desc: &FalconUCodeDescV3) -> Result<&[u8]> { let falcon_ucode_offset = self.falcon_ucode_offset;
// The ucode data follows the descriptor. let ucode_data_offset = falcon_ucode_offset + desc.size(); let size = (desc.imem_load_size + desc.dmem_load_size) as usize;
// Get the data slice, checking bounds in a single operation. self.base
.data
.get(ucode_data_offset..ucode_data_offset + size)
.ok_or(ERANGE)
.inspect_err(|_| dev_err!(dev, "fwsec ucode data not contained within BIOS bounds\n"))
}
/// Get the signatures as a byte slice pub(crate) fn sigs(
&self,
dev: &device::Device,
desc: &FalconUCodeDescV3,
) -> Result<&[Bcrt30Rsa3kSignature]> { // The signatures data follows the descriptor. let sigs_data_offset = self.falcon_ucode_offset + core::mem::size_of::<FalconUCodeDescV3>(); let sigs_size =
desc.signature_count as usize * core::mem::size_of::<Bcrt30Rsa3kSignature>();
// Make sure the data is within bounds. if sigs_data_offset + sigs_size > self.base.data.len() {
dev_err!(
dev, "fwsec signatures data not contained within BIOS bounds\n"
); return Err(ERANGE);
}
// SAFETY: we checked that `data + sigs_data_offset + (signature_count * // sizeof::<Bcrt30Rsa3kSignature>()` is within the bounds of `data`.
Ok(unsafe {
core::slice::from_raw_parts( self.base
.data
.as_ptr()
.add(sigs_data_offset)
.cast::<Bcrt30Rsa3kSignature>(),
desc.signature_count as usize,
)
})
}
}
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