This implements the LoadFile2 initrd loading protocol, which is essentially a callback face into the bootloader to load the initrd data into a caller provided buffer. This means the bootloader no longer has to contain any policy regarding where to load the initrd (which differs between architectures and kernel versions) and no longer has to manipulate arch specific data structures such as DT or struct bootparams to inform the OS where the initrd resides in memory. Sample output from booting a recent Linux/arm64 kernel: grub> insmod part_msdos grub> linux (hd0,msdos1)/Image grub> initrd (hd0,msdos1)/initrd.img grub> boot EFI stub: Booting Linux Kernel... EFI stub: EFI_RNG_PROTOCOL unavailable, KASLR will be disabled EFI stub: Generating empty DTB EFI stub: Loaded initrd from LINUX_EFI_INITRD_MEDIA_GUID device path EFI stub: Exiting boot services and installing virtual address map... [ 0.000000] Booting Linux on physical CPU 0x0000000000 [0x411fd070] Cc: grub-devel@xxxxxxx Cc: daniel.kiper@xxxxxxxxxx Cc: leif@xxxxxxxxxxxx Changes since v1: - add Leif's ack to #2, #6 and #8 - add patch #1 to fix the ARM Linux image header definition - add patches #3, #4 and #5 to unify and reuse the COFF header loading routines from Xen (and the absence of which from v1 was causing garbage to be read and interpreted as the image major version) Ard Biesheuvel (8): linux/arm: fix ARM Linux header layout loader/linux: permit NULL argument for argv[] in grub_initrd_load() efi: move MS-DOS stub out of generic PE header definition linux/arm: unify ARM/arm64 vs Xen PE/COFF header handling linux/arm: account for COFF headers appearing at unexpected offsets efi: add definition of LoadFile2 protocol efi: implement LoadFile2 initrd loading protocol for Linux linux: ignore FDT unless we need to modify it grub-core/commands/efi/lsefi.c | 1 + grub-core/kern/efi/efi.c | 5 +- grub-core/loader/arm64/linux.c | 158 +++++++++++++++++--- grub-core/loader/arm64/xen_boot.c | 23 +-- grub-core/loader/efi/fdt.c | 7 +- grub-core/loader/linux.c | 2 +- include/grub/arm/linux.h | 8 +- include/grub/arm64/linux.h | 4 + include/grub/efi/api.h | 15 ++ include/grub/efi/efi.h | 4 +- include/grub/efi/pe32.h | 5 +- 11 files changed, 185 insertions(+), 47 deletions(-) -- 2.17.1
