From: Matt Fleming <matt.flem...@intel.com> This patch series enables booting a 64-bit kernel on 32-bit EFI firmware.
Note that no boot loader changes should be necessary to take advantage of these patches, and if your bootloader of choice uses the EFI handover protocol (Syslinux, efilinux, Grub) you should automatically be able to boot a CONFIG_X86_64 kernel on 32-bit EFI by enabling CONFIG_EFI_MIXED. This series does not implement mixed mode support for the EFI boot stub, so it won't work with gummiboot or directly from the EFI shell. The full series is available on the 'mixed-mode' branch here, git://git.kernel.org/pub/scm/linux/kernel/git/mfleming/efi.git Changes since v1: - Simplify EFI_BOOT_SERVICES() as suggested by hpa ... and I remembered to actually post to LKML this time. Matt Fleming (13): x86/boot: Cleanup header.S by removing some #ifdefs x86, tools: Consolidate #ifdef code x86/mm/pageattr: Always dump the right page table in an oops x86/efi: Delete dead code when checking for non-native efi: Add separate 32-bit/64-bit definitions x86/efi: Build our own EFI services pointer table x86/efi: Add early thunk code to go from 64-bit to 32-bit x86/efi: Split the boot stub into 32/64 code paths x86/efi: Firmware agnostic handover entry points x86/efi: Add mixed runtime services support x86/efi: Wire up CONFIG_EFI_MIXED x86/boot: Don't overwrite cr4 when enabling PAE x86/efi: Re-disable interrupts after calling firmware services arch/x86/Kconfig | 14 + arch/x86/boot/Makefile | 2 +- arch/x86/boot/compressed/eboot.c | 1018 +++++++++++++++++++++++++------- arch/x86/boot/compressed/eboot.h | 60 ++ arch/x86/boot/compressed/efi_stub_64.S | 29 + arch/x86/boot/compressed/head_32.S | 50 +- arch/x86/boot/compressed/head_64.S | 108 +++- arch/x86/boot/header.S | 23 +- arch/x86/boot/tools/build.c | 76 ++- arch/x86/include/asm/efi.h | 38 +- arch/x86/include/asm/pgtable_types.h | 2 + arch/x86/kernel/setup.c | 2 +- arch/x86/mm/fault.c | 7 +- arch/x86/mm/pageattr.c | 12 +- arch/x86/platform/efi/Makefile | 1 + arch/x86/platform/efi/efi.c | 170 +++--- arch/x86/platform/efi/efi_64.c | 328 +++++++++- arch/x86/platform/efi/efi_stub_64.S | 157 +++++ arch/x86/platform/efi/efi_thunk_64.S | 65 ++ drivers/firmware/efi/efi-stub-helper.c | 148 ++--- include/linux/efi.h | 252 ++++++++ 21 files changed, 2114 insertions(+), 448 deletions(-) create mode 100644 arch/x86/platform/efi/efi_thunk_64.S -- 1.8.5.3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
