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efi: Add 64-bit payload support

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Most EFI implementations use 64-bit. Add a way to build U-Boot as a 64-bit
EFI payload. The payload unpacks a (32-bit) U-Boot and starts it. This can
be enabled for x86 boards at present.

Signed-off-by: Simon Glass <sjg@chromium.org>
Improvements to how the payload is built:
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Tested-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Simon Glass 2015-08-04 12:33:56 -06:00
parent 6f92ed8f1a
commit 96a8d409a7
6 changed files with 143 additions and 6 deletions
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2
Makefile
View File

@ -1100,7 +1100,7 @@ u-boot-payload.lds: $(LDSCRIPT_EFI) FORCE
# Rule to link the EFI payload which contains a stub and a U-Boot binary
quiet_cmd_u-boot_payload ?= LD $@
cmd_u-boot_payload ?= $(LD) $(LDFLAGS_EFI_PAYLOAD) -o $@ \
-T u-boot-payload.lds \
-T u-boot-payload.lds arch/x86/cpu/call32.o \
lib/efi/efi.o lib/efi/efi_stub.o u-boot-dtb.bin.o \
$(addprefix arch/$(ARCH)/lib/efi/,$(EFISTUB))

10
arch/x86/config.mk
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@ -34,14 +34,24 @@ OBJCOPYFLAGS_EFI := -j .text -j .sdata -j .data -j .dynamic -j .dynsym \
CFLAGS_NON_EFI := -mregparm=3
CFLAGS_EFI := -fpic -fshort-wchar
ifeq ($(CONFIG_EFI_STUB_64BIT),)
CFLAGS_EFI += $(call cc-option, -mno-red-zone)
EFIARCH = ia32
EFIPAYLOAD_BFDTARGET = elf32-i386
else
EFIARCH = x86_64
EFIPAYLOAD_BFDTARGET = elf64-x86-64
endif
EFIPAYLOAD_BFDARCH = i386
LDSCRIPT_EFI := $(srctree)/$(CPUDIR)/efi/elf_$(EFIARCH)_efi.lds
EFISTUB := crt0-efi-$(EFIARCH).o reloc_$(EFIARCH).o
OBJCOPYFLAGS_EFI += --target=efi-app-$(EFIARCH)
CPPFLAGS_REMOVE_crt0-efi-$(EFIARCH).o += $(CFLAGS_NON_EFI)
CPPFLAGS_crt0-efi-$(EFIARCH).o += $(CFLAGS_EFI)
ifeq ($(CONFIG_EFI_APP),y)
PLATFORM_CPPFLAGS += $(CFLAGS_EFI)

5
arch/x86/include/asm/types.h
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@ -44,8 +44,11 @@ typedef __INT64_TYPE__ s64;
typedef __UINT64_TYPE__ u64;
#endif
#ifdef CONFIG_EFI_STUB_64BIT
#define BITS_PER_LONG 64
#else
#define BITS_PER_LONG 32
#endif
/* Dma addresses are 32-bits wide. */
typedef u32 dma_addr_t;

51
arch/x86/lib/efi/crt0-efi-x86_64.S Normal file
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@ -0,0 +1,51 @@
/*
* crt0-efi-x86_64.S - x86_64 EFI startup code.
* Copyright (C) 1999 Hewlett-Packard Co.
* Contributed by David Mosberger <davidm@hpl.hp.com>.
* Copyright (C) 2005 Intel Co.
* Contributed by Fenghua Yu <fenghua.yu@intel.com>.
*
* All rights reserved.
* SPDX-License-Identifier: BSD-3-Clause
*/
.text
.align 4
.globl _start
_start:
subq $8, %rsp
pushq %rcx
pushq %rdx
0:
lea image_base(%rip), %rdi
lea _DYNAMIC(%rip), %rsi
popq %rcx
popq %rdx
pushq %rcx
pushq %rdx
call _relocate
popq %rdi
popq %rsi
call efi_main
addq $8, %rsp
.exit:
ret
/*
* hand-craft a dummy .reloc section so EFI knows it's a relocatable
* executable:
*/
.data
dummy: .long 0
#define IMAGE_REL_ABSOLUTE 0
.section .reloc, "a"
label1:
.long dummy-label1 /* Page RVA */
.long 10 /* Block Size (2*4+2) */
.word (IMAGE_REL_ABSOLUTE << 12) + 0 /* reloc for dummy */

7
include/efi.h
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@ -18,6 +18,13 @@
#include <linux/string.h>
#include <linux/types.h>
#ifdef CONFIG_EFI_STUB_64BIT
/* EFI uses the Microsoft ABI which is not the default for GCC */
#define EFIAPI __attribute__((ms_abi))
#else
#define EFIAPI
#endif
struct efi_device_path;
#define EFI_SUCCESS 0

74
lib/efi/efi_stub.c
View File

@ -6,8 +6,8 @@
* EFI information obtained here:
* http://wiki.phoenix.com/wiki/index.php/EFI_BOOT_SERVICES
*
* Loads a payload (U-Boot) within the EFI environment. This is built as a
* 32-bit EFI application.
* Loads a payload (U-Boot) within the EFI environment. This is built as an
* EFI application. It can be built either in 32-bit or 64-bit mode.
*/
#include <common.h>
@ -126,14 +126,16 @@ static void jump_to_uboot(ulong cs32, ulong addr, ulong info)
((func_t)addr)(0, 0, info);
#else
/* TODO: Implement this */
cpu_call32(cs32, CONFIG_SYS_TEXT_BASE, info);
#endif
}
#ifdef CONFIG_EFI_STUB_64BIT
static void get_gdt(struct desctab_info *info)
{
asm volatile ("sgdt %0" : : "m"(*info) : "memory");
}
#endif
static inline unsigned long read_cr3(void)
{
@ -156,7 +158,71 @@ static int get_codeseg32(void)
{
int cs32 = 0;
/* TODO(sjg): Implement this for 64-bit mode */
#ifdef CONFIG_EFI_STUB_64BIT
struct desctab_info gdt;
uint64_t *ptr;
int i;
get_gdt(&gdt);
for (ptr = (uint64_t *)(unsigned long)gdt.addr, i = 0; i < gdt.limit;
i += 8, ptr++) {
uint64_t desc = *ptr;
uint64_t base, limit;
/*
* Check that the target U-Boot jump address is within the
* selector and that the selector is of the right type.
*/
base = ((desc >> GDT_BASE_LOW_SHIFT) & GDT_BASE_LOW_MASK) |
((desc >> GDT_BASE_HIGH_SHIFT) & GDT_BASE_HIGH_MASK)
<< 16;
limit = ((desc >> GDT_LIMIT_LOW_SHIFT) & GDT_LIMIT_LOW_MASK) |
((desc >> GDT_LIMIT_HIGH_SHIFT) & GDT_LIMIT_HIGH_MASK)
<< 16;
base <<= 12; /* 4KB granularity */
limit <<= 12;
if ((desc & GDT_PRESENT) && (desc && GDT_NOTSYS) &&
!(desc & GDT_LONG) && (desc & GDT_4KB) &&
(desc & GDT_32BIT) && (desc & GDT_CODE) &&
CONFIG_SYS_TEXT_BASE > base &&
CONFIG_SYS_TEXT_BASE + CONFIG_SYS_MONITOR_LEN < limit
) {
cs32 = i;
break;
}
}
#ifdef DEBUG
puts("\ngdt: ");
printhex8(gdt.limit);
puts(", addr: ");
printhex8(gdt.addr >> 32);
printhex8(gdt.addr);
for (i = 0; i < gdt.limit; i += 8) {
uint32_t *ptr = (uint32_t *)((unsigned long)gdt.addr + i);
puts("\n");
printhex2(i);
puts(": ");
printhex8(ptr[1]);
puts(" ");
printhex8(ptr[0]);
}
puts("\n ");
puts("32-bit code segment: ");
printhex2(cs32);
puts("\n ");
puts("page_table: ");
printhex8(read_cr3());
puts("\n ");
#endif
if (!cs32) {
puts("Can't find 32-bit code segment\n");
return -ENOENT;
}
#endif
return cs32;
}