Messages in this thread | | | From | Matt Fleming <> | Subject | [PATCH v5 00/10] x86 EFI boot stub | Date | Mon, 17 Oct 2011 11:40:07 +0100 |
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From: Matt Fleming <matt.fleming@intel.com>
This series adds support for an EFI boot stub, similar to the existing BIOS boot stub. The result is that you can boot a bzImage on an EFI machine without the use of a boot loader by making the bzImage appear to the EFI firmware to be an EFI application. Also, a single bzImage can be booted on either a BIOS or EFI machine.
Using the EFI boot stub has the advantage that the kernel is responsible for configuring the machine to the point where we can fully boot the kernel, so we are no longer at the mercy of the boot loader.
Changes in v5:
- load_options_size is UTF-16, which needs dividing by 2 to convert to the corresponding ASCII size. Otherwise we could potentially read more than load_options_size because we're comparing UTF-16 and ASCII (reported by Maarten Lankhorst).
Changes in v4:
- Don't read more than image->load_options_size when reading command-line args.
Changes in v3:
- Fix compiler warnings when compiling CONFIG_EFI_STUB=n - Fix GOP search as suggested by Matthew Garrett. - Fix initrd memory allocation. - Fix various bugs pointed out by Maarten Lankhorst.
Changes in v2:
- Added PATCH 01/10 because we now need to access hdr.pref_address and hdr.init_size when relocating the bzImage
- Added relocation support to the stub because the firmware might load the bzImage at a very high physical address
- Fixed the alignment of some u64 fields on x86
- Now we dynamically write some fields in the bzImage EFI header at arch/x86/boot/tools/build time.
- Added UGA support
- Replaced some magic numbers with constants
Matt Fleming (10): x86: Add missing bzImage fields to struct setup_header x86, efi: Make efi_call_phys_prelog() CONFIG_RELOCATABLE-aware x86: Don't use magic strings for EFI loader signature efi.h: Add struct definition for boot time services efi.h: Add efi_image_loaded_t efi.h: Add allocation types for boottime->allocate_pages() efi.h: Add graphics protocol guids efi.h: Add boottime->locate_handle search types efi: Add EFI file I/O data types x86, efi: EFI boot stub support
arch/x86/Kconfig | 7 + arch/x86/boot/compressed/Makefile | 10 +- arch/x86/boot/compressed/eboot.c | 975 ++++++++++++++++++++++++++++++++ arch/x86/boot/compressed/efi_stub_32.S | 87 +++ arch/x86/boot/compressed/efi_stub_64.S | 1 + arch/x86/boot/compressed/head_32.S | 22 + arch/x86/boot/compressed/head_64.S | 20 + arch/x86/boot/compressed/string.c | 9 + arch/x86/boot/header.S | 158 +++++ arch/x86/boot/string.c | 35 ++ arch/x86/boot/tools/build.c | 39 ++ arch/x86/include/asm/bootparam.h | 2 + arch/x86/include/asm/efi.h | 4 + arch/x86/kernel/asm-offsets.c | 2 + arch/x86/kernel/setup.c | 7 +- arch/x86/platform/efi/efi_32.c | 22 +- include/linux/efi.h | 136 +++++- 17 files changed, 1519 insertions(+), 17 deletions(-) create mode 100644 arch/x86/boot/compressed/eboot.c create mode 100644 arch/x86/boot/compressed/efi_stub_32.S create mode 100644 arch/x86/boot/compressed/efi_stub_64.S
-- 1.7.4.4
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