boot

func CreateMemfdFromReader ¶

func CreateMemfdFromReader(name string, reader io.Reader) (*os.File, error)

CreateMemfdFromReader creates an anonymous file in memory via memfd_create and copies data from reader.

func HandleNo5LVLWorkaround ¶

func HandleNo5LVLWorkaround()

HandleNo5LVLWorkaround adds "no5lvl" to GRUB config and reboots to disable 5-level paging, which is incompatible with the Talos kernel (compiled without CONFIG_X86_5LEVEL).

After the reboot the user must re-run boot-to-talos.

func Is5LevelPagingActive ¶

func Is5LevelPagingActive() bool

Is5LevelPagingActive detects if the host kernel uses 5-level page tables (LA57).

5-level paging extends the virtual address space from 48-bit (4-level) to 57-bit. Detection works by attempting mmap at an address above the 4-level canonical limit (2^48). If the mapping succeeds, the kernel is using 5-level page tables.

This matters for kexec: if the host runs 5-level paging but the target kernel (Talos) is compiled without CONFIG_X86_5LEVEL, the kexec handoff will triple-fault because the target decompressor cannot handle the 5→4 level paging transition.

func KexecLoadFromAssets ¶

func KexecLoadFromAssets(assets *types.BootAssets, extraCmdline string) error

KexecLoadFromAssets loads kernel via kexec_file_load syscall from BootAssets.

func RunBootMode ¶

func RunBootMode(source types.ImageSource, extraArgs []string)

RunBootMode executes boot mode: shows summary, asks confirmation, loads kernel via kexec.