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i386/relocator: Add grub_relocator64_efi relocator

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Add grub_relocator64_efi relocator. It will be used on EFI 64-bit platforms
when multiboot2 compatible image requests MULTIBOOT_TAG_TYPE_EFI_BS. Relocator
will set lower parts of %rax and %rbx accordingly to multiboot2 specification.
On the other hand processor mode, just before jumping into loaded image, will
be set accordingly to Unified Extensible Firmware Interface Specification,
Version 2.4 Errata B, section 2.3.4, x64 Platforms, boot services. This way
loaded image will be able to use EFI boot services without any issues.

Signed-off-by: Daniel Kiper <daniel.kiper@oracle.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Reviewed-by: Vladimir Serbinenko <phcoder@gmail.com>
This commit is contained in:
Daniel Kiper 2015-07-17 19:43:42 +02:00
parent e563928ba4
commit 9862b24121
8 changed files with 186 additions and 9 deletions
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19
grub-core/loader/multiboot_mbi2.c
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@ -107,8 +107,8 @@ grub_multiboot_load (grub_file_t file, const char *filename)
grub_err_t err;
struct multiboot_header_tag *tag;
struct multiboot_header_tag_address *addr_tag = NULL;
int entry_specified = 0;
grub_addr_t entry = 0;
int entry_specified = 0, efi_entry_specified = 0;
grub_addr_t entry = 0, efi_entry = 0;
grub_uint32_t console_required = 0;
struct multiboot_header_tag_framebuffer *fbtag = NULL;
int accepted_consoles = GRUB_MULTIBOOT_CONSOLE_EGA_TEXT;
@ -192,6 +192,13 @@ grub_multiboot_load (grub_file_t file, const char *filename)
entry = ((struct multiboot_header_tag_entry_address *) tag)->entry_addr;
break;
case MULTIBOOT_HEADER_TAG_ENTRY_ADDRESS_EFI64:
#if defined (GRUB_MACHINE_EFI) && defined (__x86_64__)
efi_entry_specified = 1;
efi_entry = ((struct multiboot_header_tag_entry_address *) tag)->entry_addr;
#endif
break;
case MULTIBOOT_HEADER_TAG_CONSOLE_FLAGS:
if (!(((struct multiboot_header_tag_console_flags *) tag)->console_flags
& MULTIBOOT_CONSOLE_FLAGS_EGA_TEXT_SUPPORTED))
@ -211,7 +218,9 @@ grub_multiboot_load (grub_file_t file, const char *filename)
break;
case MULTIBOOT_HEADER_TAG_EFI_BS:
#ifdef GRUB_MACHINE_EFI
keep_bs = 1;
#endif
break;
default:
@ -224,7 +233,7 @@ grub_multiboot_load (grub_file_t file, const char *filename)
break;
}
if (addr_tag && !entry_specified)
if (addr_tag && !entry_specified && !(keep_bs && efi_entry_specified))
{
grub_free (buffer);
return grub_error (GRUB_ERR_UNKNOWN_OS,
@ -287,7 +296,9 @@ grub_multiboot_load (grub_file_t file, const char *filename)
}
}
if (entry_specified)
if (keep_bs && efi_entry_specified)
grub_multiboot_payload_eip = efi_entry;
else if (entry_specified)
grub_multiboot_payload_eip = entry;
if (fbtag)