At present U-Boot runs entirely in 32-bit mode on x86, except for the initial switch from 16-bit mode. On 64-bit machines it is possible to run in 64-bit mode. This series starts the process of adding this support.
The main benefit of 64-bit mode for a boot loader is direct access to all available memory. There are also more registers, but this makes very little difference.
This feature is implemented by putting all of the 32-bit code in an SPL build. SPL then runs through all the init that has to be done in 32-bit mode, changes to 64-bit mode and then jumps to U-Boot proper.
Typically the total code size increases slightly. For example, on link in 32-bit mode, U-Boot has around 480KB of code (admittedly with a large number of features enabled). In 64-bit mode, U-Boot falls to around 460KB, but SPL adds another 60KB, for a net increase of 40KB. Partly this is due to code duplication and partly it is due to the worse code density of 64-bit code on x86.
Many major features are not implemented yet, for example: - SDRAM sizing - Booting linux - FSP support - EFI support - SCSI device init - Running video ROMs
Still, this is a big step forward towards full 64-bit support. To enable it, select CONFIG_X86_RUN_64BIT.
This series is available at u-boot-x86/64-working
Simon Glass (82): WIP: x86: Fix up types in smbios code Add _image_binary_end section declaration bios_emulator: Fix cast for 64-bit compilation board_f: Drop the extra fdtdec_prepare_fdt() console: Don't enable CONFIG-CONSOLE_MUX, etc. in SPL elf: Add the Elf64_Rela type mmc: Fix cast for 64-bit compilation rtc: Use CONFIG_X86 instead of __I386__ spl: spi: Add a debug message if loading fails spl: Makefile: Define SPL_ earlier spl: Allow CPU drivers to be used in SPL spl: Allow PCI drivers to be used in SPL spl: Allow RTC drivers to be used in SPL spl: Allow timer drivers to be used in SPL spl: Allow PCH drivers to be used in SPL spl: Don't create a BSS padding when it is separate tpm: Tidy up use of size_t usb: pci: Fix cast for 64-bit compilation video: Use ulong for video frame buffer address x86: Allow interrupts to be disabled in 64-bit mode x86: Correct address casts in cpu code x86: Correct address casts in interrupt code x86: Use unsigned long for address in table generation WIP: x86: Update mpspec to build on 64-bit machines x86: Add basic support for U-Boot as a 64-bit EFI application x86: ivybridge: Declare global data where it is used x86: i2c: Fix cast of address to 32-bit value x86: Don't export interrupt handlers with x86_64 x86: ivybridge: Add more debugging for failures x86: ivybridge: Fix types for 64-bit compilation x86: ivybridge: Fix PCH power setup x86: ivybridge: Tidy up enable_clock_gating() for 64-bit x86: dts: Mark serial as needed before relocation x86: fsp: Fix cast for 64-bit compilation x86: Drop unused init_helper functions x86: lib: Fix types and casts for 64-bit compilation x86: mrccache: Fix error handling in mrccache_get_region() x86: Add Kconfig options to build 64-bit U-Boot x86: Kconfig: Add location options for 16/32-bit init x86: Use X86_16BIT_INIT instead of X86_RESET_VECTOR x86: Use X86_32BIT_INIT instead of X86_RESET_VECTOR x86: ivybridge: Allow 32-bit init to move to SPL x86: Add 64-bit start-up code x86: board_f: Update init sequence for 64-bit startup x86: board_r: Set the global data pointer after relocation x86: Do relocation before clearing BSS x86: Refactor relocation to prepare for 64-bit x86: Add support for 64-bit relocation x86: Tidy up use of size_t in relocation x86: Add an SPL implementation x86: Move the i386 code into its own directory x86: Add cpu code for x86_64 x86: Support global_data on x86_64 x86: Fix up CONFIG_X86_64 check x86: Add a link script for 64-bit x86 x86: Add a link script for SPL x86: Add SPL build rules for start-up code x86: Fix up byteorder.h for x86_64 x86: Drop flag_is_changable() on x86_64 x86: Fix up type sizes for 64-bit x86: Mention the MRC region in the README x86: ivybridge: Only do graphics init in 32-bit mode x86: ivybridge: Skipt SATA init in SPL x86: ivybridge: Provide a dummy SDRAM init for 64-bit x86: Don't try to run the VGA BIOS in 64-bit mode x86: Don't build call64 and setjmp on 64-bit x86: Don't build cpu files which are not supported on 64-bit x86: Don't try to boot Linux from SPL x86: Drop interrupt support in 64-bit mode x86: Support jumping from SPL to U-Boot x86: Move pirq_routing_table to global_data x86: Move turbo_state to global_data x86: Change irq_already_routed to a local variable x86: Move call64 to the i386 directory x86: Move setjmp to the i386 directory x86: Add a dummy setjmp implementation for x86_64 x86: link: Add a text base for 64-bit U-Boot x86: link: Add SPL declarations to the binman image x86: link: Set up device tree for SPL x86: link: Add build options for SPL x86: Update compile/link flags to support 64-bit U-Boot x86: link: Switch to 64-bit U-Boot
Makefile | 7 +- arch/x86/Kconfig | 85 ++++ arch/x86/Makefile | 9 +- arch/x86/config.mk | 30 +- arch/x86/cpu/Makefile | 24 +- arch/x86/cpu/config.mk | 8 +- arch/x86/cpu/cpu.c | 506 -------------------- arch/x86/cpu/efi/elf_x86_64_efi.lds | 3 + arch/x86/cpu/i386/Makefile | 9 + arch/x86/cpu/{ => i386}/call64.S | 3 + arch/x86/cpu/i386/cpu.c | 599 ++++++++++++++++++++++++ arch/x86/cpu/{interrupts.c => i386/interrupt.c} | 13 +- arch/x86/cpu/{ => i386}/setjmp.S | 0 arch/x86/cpu/intel_common/Makefile | 10 +- arch/x86/cpu/irq.c | 14 +- arch/x86/cpu/ivybridge/Makefile | 11 +- arch/x86/cpu/ivybridge/bd82x6x.c | 6 + arch/x86/cpu/ivybridge/cpu.c | 4 +- arch/x86/cpu/ivybridge/gma.c | 4 +- arch/x86/cpu/ivybridge/lpc.c | 18 +- arch/x86/cpu/ivybridge/model_206ax.c | 2 + arch/x86/cpu/ivybridge/northbridge.c | 2 + arch/x86/cpu/ivybridge/sata.c | 4 +- arch/x86/cpu/ivybridge/sdram.c | 36 +- arch/x86/cpu/ivybridge/sdram_nop.c | 29 ++ arch/x86/cpu/start64.S | 39 ++ arch/x86/cpu/turbo.c | 8 +- arch/x86/cpu/u-boot-64.lds | 76 +++ arch/x86/cpu/u-boot-spl.lds | 74 +++ arch/x86/cpu/u-boot.lds | 2 +- arch/x86/cpu/x86_64/Makefile | 6 + arch/x86/cpu/x86_64/cpu.c | 48 ++ arch/x86/cpu/x86_64/interrupts.c | 30 ++ arch/x86/cpu/x86_64/setjmp.c | 20 + arch/x86/dts/binman.dtsi | 19 + arch/x86/dts/chromebook_link.dts | 15 +- arch/x86/dts/serial.dtsi | 1 + arch/x86/include/asm/acpi_table.h | 2 +- arch/x86/include/asm/byteorder.h | 17 +- arch/x86/include/asm/cpu.h | 12 + arch/x86/include/asm/fsp/fsp_hob.h | 2 +- arch/x86/include/asm/global_data.h | 8 +- arch/x86/include/asm/init_helpers.h | 2 - arch/x86/include/asm/mp.h | 3 + arch/x86/include/asm/mpspec.h | 10 +- arch/x86/include/asm/posix_types.h | 5 + arch/x86/include/asm/sfi.h | 2 +- arch/x86/include/asm/smbios.h | 4 +- arch/x86/include/asm/spl.h | 8 + arch/x86/include/asm/tables.h | 2 +- arch/x86/include/asm/types.h | 5 + arch/x86/lib/Makefile | 9 + arch/x86/lib/acpi_table.c | 4 +- arch/x86/lib/bios.c | 4 +- arch/x86/lib/bootm.c | 2 + arch/x86/lib/init_helpers.c | 12 +- arch/x86/lib/interrupts.c | 5 + arch/x86/lib/mpspec.c | 14 +- arch/x86/lib/mrccache.c | 8 +- arch/x86/lib/pinctrl_ich6.c | 2 +- arch/x86/lib/pirq_routing.c | 14 +- arch/x86/lib/reloc_x86_64.c | 90 ++++ arch/x86/lib/relocate.c | 102 +++- arch/x86/lib/sfi.c | 6 +- arch/x86/lib/smbios.c | 22 +- arch/x86/lib/spl.c | 149 ++++++ arch/x86/lib/tables.c | 2 +- arch/x86/lib/zimage.c | 2 +- board/google/chromebook_link/Kconfig | 3 +- common/board_f.c | 17 +- common/board_r.c | 5 + common/console.c | 30 +- common/spl/Kconfig | 47 ++ common/spl/spl_spi.c | 4 +- configs/chromebook_link_defconfig | 22 +- doc/README.x86 | 1 + drivers/Makefile | 5 + drivers/bios_emulator/atibios.c | 2 +- drivers/i2c/intel_i2c.c | 6 +- drivers/misc/qfw.c | 4 +- drivers/mmc/pci_mmc.c | 2 +- drivers/pci/pci_rom.c | 2 +- drivers/rtc/mc146818.c | 2 +- drivers/tpm/tpm_tis_lpc.c | 4 +- drivers/usb/host/ehci-pci.c | 4 +- include/_exports.h | 2 +- include/asm-generic/sections.h | 1 + include/configs/chromebook_link.h | 9 + include/elf.h | 6 + include/video_fb.h | 2 +- scripts/Makefile.spl | 18 +- 91 files changed, 1796 insertions(+), 705 deletions(-) create mode 100644 arch/x86/cpu/i386/Makefile rename arch/x86/cpu/{ => i386}/call64.S (98%) create mode 100644 arch/x86/cpu/i386/cpu.c rename arch/x86/cpu/{interrupts.c => i386/interrupt.c} (98%) rename arch/x86/cpu/{ => i386}/setjmp.S (100%) create mode 100644 arch/x86/cpu/ivybridge/sdram_nop.c create mode 100644 arch/x86/cpu/start64.S create mode 100644 arch/x86/cpu/u-boot-64.lds create mode 100644 arch/x86/cpu/u-boot-spl.lds create mode 100644 arch/x86/cpu/x86_64/Makefile create mode 100644 arch/x86/cpu/x86_64/cpu.c create mode 100644 arch/x86/cpu/x86_64/interrupts.c create mode 100644 arch/x86/cpu/x86_64/setjmp.c create mode 100644 arch/x86/include/asm/spl.h create mode 100644 arch/x86/lib/reloc_x86_64.c create mode 100644 arch/x86/lib/spl.c