Fix: repr(packed) does not imply repr(C)

Author: phil-opp

bios/boot_sector/src/dap.rs

@@ -1,6 +1,6 @@
 use core::arch::asm;
 
-#[repr(packed)]
+#[repr(C, packed)]
 #[allow(dead_code)] // the structure format is defined by the hardware
 pub struct DiskAddressPacket {
     /// Size of the DAP structure

bios/stage-2/src/dap.rs

@@ -2,7 +2,7 @@ use core::arch::asm;
 
 #[derive(Debug, Clone, Copy)]
 #[allow(dead_code)]
-#[repr(packed)]
+#[repr(C, packed)]
 pub struct DiskAddressPacket {
     /// Size of the DAP structure
     packet_size: u8,

bios/stage-2/src/vesa.rs

@@ -5,7 +5,7 @@ use bootloader_x86_64_bios_common::PixelFormat;
 use crate::{disk::AlignedBuffer, AlignedArrayBuffer};
 use core::arch::asm;
 
-#[repr(packed)]
+#[repr(C, packed)]
 #[allow(dead_code)]
 struct VbeInfoBlock {
     signature: [u8; 4], // should be "VESA"