x86: Add support for U-Boot as an EFI application
Add the required x86 glue code. This includes the initial start-up, relocation and jumping to efi_main(). We also need to avoid fiddling with interrupts. Signed-off-by: Ben Stoltz <stoltz@google.com> Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Ben Stoltz
Simon Glass
parent
ed3b4d3736
commit
3dcdd17b43
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@ -11,6 +11,9 @@ choice
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config VENDOR_COREBOOT
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bool "coreboot"
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config VENDOR_EFI
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bool "efi"
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config VENDOR_EMULATION
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bool "emulation"
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@ -2,7 +2,9 @@
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# SPDX-License-Identifier: GPL-2.0+
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#
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ifeq ($(CONFIG_EFI_APP),)
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head-y := arch/x86/cpu/start.o
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endif
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ifeq ($(CONFIG_SPL_BUILD),y)
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head-y += arch/x86/cpu/start16.o
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head-y += arch/x86/cpu/resetvec.o
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@ -14,6 +14,7 @@ obj-y += interrupts.o cpu.o cpu_x86.o call64.o
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obj-$(CONFIG_INTEL_BAYTRAIL) += baytrail/
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obj-$(CONFIG_SYS_COREBOOT) += coreboot/
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obj-$(CONFIG_EFI_APP) += efi/
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obj-$(CONFIG_QEMU) += qemu/
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obj-$(CONFIG_NORTHBRIDGE_INTEL_SANDYBRIDGE) += ivybridge/
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obj-$(CONFIG_NORTHBRIDGE_INTEL_IVYBRIDGE) += ivybridge/
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@ -0,0 +1,8 @@
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#
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# Copyright (c) 2015 Google, Inc
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#
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# SPDX-License-Identifier: GPL-2.0+
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#
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obj-y += efi.o
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obj-y += sdram.o
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@ -0,0 +1,42 @@
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/*
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* Copyright (c) 2015 Google, Inc
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <fdtdec.h>
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#include <netdev.h>
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int arch_cpu_init(void)
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{
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#ifdef CONFIG_SYS_X86_TSC_TIMER
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timer_set_base(rdtsc());
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#endif
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return 0;
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}
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int board_early_init_f(void)
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{
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return 0;
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}
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int print_cpuinfo(void)
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{
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return default_print_cpuinfo();
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}
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void board_final_cleanup(void)
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{
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}
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int misc_init_r(void)
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{
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return 0;
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}
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int arch_misc_init(void)
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{
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return 0;
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}
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@ -0,0 +1,94 @@
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/*
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* U-Boot EFI linker script
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Modified from usr/lib32/elf_ia32_efi.lds in gnu-efi
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*/
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#include <config.h>
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OUTPUT_FORMAT("elf32-i386", "elf32-i386", "elf32-i386")
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OUTPUT_ARCH(i386)
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ENTRY(_start)
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SECTIONS
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{
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image_base = .;
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.hash : { *(.hash) } /* this MUST come first, EFI expects it */
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. = ALIGN(4096);
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.text :
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{
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*(.text)
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*(.text.*)
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*(.gnu.linkonce.t.*)
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}
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. = ALIGN(4096);
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.sdata :
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{
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*(.got.plt)
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*(.got)
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*(.srodata)
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*(.sdata)
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*(.sbss)
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*(.scommon)
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}
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. = ALIGN(4096);
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.data :
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{
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*(.rodata*)
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*(.data)
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*(.data1)
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*(.data.*)
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*(.sdata)
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*(.got.plt)
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*(.got)
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/*
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* the EFI loader doesn't seem to like a .bss section, so we
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* stick it all into .data:
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*/
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*(.sbss)
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*(.scommon)
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*(.dynbss)
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*(.bss)
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*(COMMON)
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/* U-Boot lists and device tree */
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. = ALIGN(8);
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*(SORT(.u_boot_list*));
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. = ALIGN(8);
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*(.dtb*);
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}
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. = ALIGN(4096);
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.dynamic : { *(.dynamic) }
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. = ALIGN(4096);
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.rel :
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{
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*(.rel.data)
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*(.rel.data.*)
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*(.rel.got)
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*(.rel.stab)
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*(.data.rel.ro.local)
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*(.data.rel.local)
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*(.data.rel.ro)
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*(.data.rel*)
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*(.rel.u_boot_list*)
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}
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. = ALIGN(4096);
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.reloc : /* This is the PECOFF .reloc section! */
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{
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*(.reloc)
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}
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. = ALIGN(4096);
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.dynsym : { *(.dynsym) }
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. = ALIGN(4096);
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.dynstr : { *(.dynstr) }
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. = ALIGN(4096);
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/DISCARD/ :
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{
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*(.rel.reloc)
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*(.eh_frame)
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*(.note.GNU-stack)
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}
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.comment 0 : { *(.comment) }
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}
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@ -0,0 +1,29 @@
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/*
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* Copyright (c) 2015 Google, Inc
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <efi.h>
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#include <asm/u-boot-x86.h>
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DECLARE_GLOBAL_DATA_PTR;
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ulong board_get_usable_ram_top(ulong total_size)
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{
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return (ulong)efi_get_ram_base() + gd->ram_size;
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}
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int dram_init(void)
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{
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/* gd->ram_size is set as part of EFI init */
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return 0;
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}
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void dram_init_banksize(void)
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{
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gd->bd->bi_dram[0].start = efi_get_ram_base();
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gd->bd->bi_dram[0].size = CONFIG_EFI_RAM_SIZE;
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}
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@ -242,6 +242,11 @@ int disable_interrupts(void)
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int interrupt_init(void)
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{
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/*
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* When running as an EFI application we are not in control of
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* interrupts and should leave them alone.
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*/
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#ifndef CONFIG_EFI_APP
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/* Just in case... */
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disable_interrupts();
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@ -255,6 +260,7 @@ int interrupt_init(void)
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/* It is now safe to enable interrupts */
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enable_interrupts();
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#endif
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return 0;
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}
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@ -0,0 +1,10 @@
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/*
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* Copyright (c) 2015 Google, Inc.
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#ifndef _X86_ARCH_GPIO_H_
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#define _X86_ARCH_GPIO_H_
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#endif /* _X86_ARCH_GPIO_H_ */
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@ -0,0 +1,52 @@
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/*
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* crt0-efi-ia32.S - x86 EFI startup code.
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*
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* Copyright (C) 1999 Hewlett-Packard Co.
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* Contributed by David Mosberger <davidm@hpl.hp.com>.
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* All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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.text
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.align 4
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.globl _start
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_start:
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pushl %ebp
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movl %esp,%ebp
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pushl 12(%ebp) # copy "image" argument
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pushl 8(%ebp) # copy "systab" argument
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call 0f
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0: popl %eax
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movl %eax,%ebx
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addl $image_base-0b,%eax # %eax = ldbase
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addl $_DYNAMIC-0b,%ebx # %ebx = _DYNAMIC
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pushl %ebx # pass _DYNAMIC as second argument
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pushl %eax # pass ldbase as first argument
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call _relocate
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popl %ebx
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popl %ebx
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testl %eax,%eax
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jne .exit
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call efi_main # call app with "image" and "systab" argument
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.exit: leave
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ret
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/*
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* hand-craft a dummy .reloc section so EFI knows it's a relocatable
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* executable:
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*/
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.data
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dummy: .long 0
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#define IMAGE_REL_ABSOLUTE 0
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.section .reloc
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.long dummy /* Page RVA */
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.long 10 /* Block Size (2*4+2) */
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.word (IMAGE_REL_ABSOLUTE << 12) + 0 /* reloc for dummy */
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@ -0,0 +1,72 @@
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/*
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* reloc_ia32.c - position independent x86 ELF shared object relocator
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* Copyright (C) 1999 Hewlett-Packard Co.
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* Contributed by David Mosberger <davidm@hpl.hp.com>.
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*
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* All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <common.h>
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#include <efi.h>
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#include <elf.h>
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#include <asm/elf.h>
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efi_status_t _relocate(long ldbase, Elf32_Dyn *dyn, efi_handle_t image,
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struct efi_system_table *systab)
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{
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long relsz = 0, relent = 0;
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Elf32_Rel *rel = 0;
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unsigned long *addr;
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int i;
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for (i = 0; dyn[i].d_tag != DT_NULL; ++i) {
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switch (dyn[i].d_tag) {
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case DT_REL:
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rel = (Elf32_Rel *)((unsigned long)dyn[i].d_un.d_ptr +
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ldbase);
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break;
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case DT_RELSZ:
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relsz = dyn[i].d_un.d_val;
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break;
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case DT_RELENT:
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relent = dyn[i].d_un.d_val;
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break;
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case DT_RELA:
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break;
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default:
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break;
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}
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}
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if (!rel && relent == 0)
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return EFI_SUCCESS;
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if (!rel || relent == 0)
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return EFI_LOAD_ERROR;
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while (relsz > 0) {
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/* apply the relocs */
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switch (ELF32_R_TYPE(rel->r_info)) {
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case R_386_NONE:
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break;
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case R_386_RELATIVE:
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addr = (unsigned long *)(ldbase + rel->r_offset);
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*addr += ldbase;
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break;
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default:
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break;
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}
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rel = (Elf32_Rel *)((char *)rel + relent);
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relsz -= relent;
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}
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return EFI_SUCCESS;
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}
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