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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH 4/5] i386/relocator: Add grub_relocator64_efi relocator
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.
If idea is accepted I will prepare grub_relocator32_efi relocator too.
Signed-off-by: Daniel Kiper <daniel.kiper@xxxxxxxxxx>
---
grub-core/Makefile.core.def | 1 +
grub-core/lib/i386/relocator.c | 53 +++++++++++++++++++++++
grub-core/lib/i386/relocator64_efi.S | 77 ++++++++++++++++++++++++++++++++++
grub-core/loader/multiboot.c | 29 +++++++++++--
grub-core/loader/multiboot_mbi2.c | 19 +++++++--
include/grub/i386/multiboot.h | 11 +++++
include/grub/i386/relocator.h | 21 ++++++++++
include/multiboot2.h | 9 ++++
8 files changed, 213 insertions(+), 7 deletions(-)
create mode 100644 grub-core/lib/i386/relocator64_efi.S
diff --git a/grub-core/Makefile.core.def b/grub-core/Makefile.core.def
index 42443bc..3a01189 100644
--- a/grub-core/Makefile.core.def
+++ b/grub-core/Makefile.core.def
@@ -1533,6 +1533,7 @@ module = {
x86 = lib/i386/relocator_common_c.c;
ieee1275 = lib/ieee1275/relocator.c;
efi = lib/efi/relocator.c;
+ x86_64_efi = lib/i386/relocator64_efi.S;
mips = lib/mips/relocator_asm.S;
mips = lib/mips/relocator.c;
powerpc = lib/powerpc/relocator_asm.S;
diff --git a/grub-core/lib/i386/relocator.c b/grub-core/lib/i386/relocator.c
index b879e5b..f4d688e 100644
--- a/grub-core/lib/i386/relocator.c
+++ b/grub-core/lib/i386/relocator.c
@@ -69,6 +69,19 @@ extern grub_uint64_t grub_relocator64_rsi;
extern grub_addr_t grub_relocator64_cr3;
extern struct grub_i386_idt grub_relocator16_idt;
+#ifdef GRUB_MACHINE_EFI
+#ifdef __x86_64__
+extern grub_uint8_t grub_relocator64_efi_start;
+extern grub_uint8_t grub_relocator64_efi_end;
+extern grub_uint64_t grub_relocator64_efi_rax;
+extern grub_uint64_t grub_relocator64_efi_rbx;
+extern grub_uint64_t grub_relocator64_efi_rcx;
+extern grub_uint64_t grub_relocator64_efi_rdx;
+extern grub_uint64_t grub_relocator64_efi_rip;
+extern grub_uint64_t grub_relocator64_efi_rsi;
+#endif
+#endif
+
#define RELOCATOR_SIZEOF(x) (&grub_relocator##x##_end -
&grub_relocator##x##_start)
grub_err_t
@@ -213,3 +226,43 @@ grub_relocator64_boot (struct grub_relocator *rel,
/* Not reached. */
return GRUB_ERR_NONE;
}
+
+#ifdef GRUB_MACHINE_EFI
+#ifdef __x86_64__
+grub_err_t
+grub_relocator64_efi_boot (struct grub_relocator *rel,
+ struct grub_relocator64_efi_state state)
+{
+ grub_err_t err;
+ void *relst;
+ grub_relocator_chunk_t ch;
+
+ err = grub_relocator_alloc_chunk_align (rel, &ch, 0,
+ 0x40000000 - RELOCATOR_SIZEOF
(64_efi),
+ RELOCATOR_SIZEOF (64_efi), 16,
+ GRUB_RELOCATOR_PREFERENCE_NONE, 1);
+ if (err)
+ return err;
+
+ grub_relocator64_efi_rax = state.rax;
+ grub_relocator64_efi_rbx = state.rbx;
+ grub_relocator64_efi_rcx = state.rcx;
+ grub_relocator64_efi_rdx = state.rdx;
+ grub_relocator64_efi_rip = state.rip;
+ grub_relocator64_efi_rsi = state.rsi;
+
+ grub_memmove (get_virtual_current_address (ch), &grub_relocator64_efi_start,
+ RELOCATOR_SIZEOF (64_efi));
+
+ err = grub_relocator_prepare_relocs (rel, get_physical_target_address (ch),
+ &relst, NULL);
+ if (err)
+ return err;
+
+ ((void (*) (void)) relst) ();
+
+ /* Not reached. */
+ return GRUB_ERR_NONE;
+}
+#endif
+#endif
diff --git a/grub-core/lib/i386/relocator64_efi.S
b/grub-core/lib/i386/relocator64_efi.S
new file mode 100644
index 0000000..6baaec6
--- /dev/null
+++ b/grub-core/lib/i386/relocator64_efi.S
@@ -0,0 +1,77 @@
+/*
+ * GRUB -- GRand Unified Bootloader
+ * Copyright (C) 2009,2010 Free Software Foundation, Inc.
+ * Copyright (C) 2014,2015 Oracle Corp.
+ * Author: Daniel Kiper
+ *
+ * GRUB is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * GRUB is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GRUB. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "relocator_common.S"
+
+ .p2align 4 /* force 16-byte alignment */
+
+VARIABLE(grub_relocator64_efi_start)
+ PREAMBLE
+
+ .code64
+
+ /* mov imm64, %rax */
+ .byte 0x48
+ .byte 0xb8
+VARIABLE(grub_relocator64_efi_rsi)
+ .quad 0
+
+ movq %rax, %rsi
+
+ /* mov imm64, %rax */
+ .byte 0x48
+ .byte 0xb8
+VARIABLE(grub_relocator64_efi_rax)
+ .quad 0
+
+ /* mov imm64, %rbx */
+ .byte 0x48
+ .byte 0xbb
+VARIABLE(grub_relocator64_efi_rbx)
+ .quad 0
+
+ /* mov imm64, %rcx */
+ .byte 0x48
+ .byte 0xb9
+VARIABLE(grub_relocator64_efi_rcx)
+ .quad 0
+
+ /* mov imm64, %rdx */
+ .byte 0x48
+ .byte 0xba
+VARIABLE(grub_relocator64_efi_rdx)
+ .quad 0
+
+ /* Cleared direction flag is of no problem with any current
+ payload and makes this implementation easier. */
+ cld
+
+#ifdef __APPLE__
+ .byte 0xff, 0x25
+ .quad 0
+#else
+ jmp *LOCAL(jump_addr) (%rip)
+#endif
+
+LOCAL(jump_addr):
+VARIABLE(grub_relocator64_efi_rip)
+ .quad 0
+
+VARIABLE(grub_relocator64_efi_end)
diff --git a/grub-core/loader/multiboot.c b/grub-core/loader/multiboot.c
index 307da32..cd0d98c 100644
--- a/grub-core/loader/multiboot.c
+++ b/grub-core/loader/multiboot.c
@@ -118,20 +118,43 @@ grub_multiboot_set_video_mode (void)
return err;
}
+#ifdef GRUB_MACHINE_EFI
+#ifdef __x86_64__
+#define grub_relocator_efi_boot grub_relocator64_efi_boot
+#endif
+#endif
+
static grub_err_t
grub_multiboot_boot (void)
{
grub_err_t err;
+ grub_uint32_t target;
struct grub_relocator32_state state = MULTIBOOT_INITIAL_STATE;
+#ifdef GRUB_MACHINE_EFI
+#ifdef __x86_64__
+ struct grub_relocator64_efi_state state_efi = MULTIBOOT_EFI_INITIAL_STATE;
+#endif
+#endif
- state.MULTIBOOT_ENTRY_REGISTER = grub_multiboot_payload_eip;
-
- err = grub_multiboot_make_mbi (&state.MULTIBOOT_MBI_REGISTER);
+ err = grub_multiboot_make_mbi (&target);
if (err)
return err;
+ state.MULTIBOOT_ENTRY_REGISTER = grub_multiboot_payload_eip;
+ state.MULTIBOOT_MBI_REGISTER = target;
+
+#if defined (GRUB_MACHINE_EFI) && defined (__x86_64__)
+ state_efi.MULTIBOOT_EFI_ENTRY_REGISTER = grub_multiboot_payload_eip;
+ state_efi.MULTIBOOT_EFI_MBI_REGISTER = target;
+
+ if (grub_efi_is_finished)
+ grub_relocator32_boot (grub_multiboot_relocator, state);
+ else
+ grub_relocator_efi_boot (grub_multiboot_relocator, state_efi);
+#else
grub_relocator32_boot (grub_multiboot_relocator, state);
+#endif
/* Not reached. */
return GRUB_ERR_NONE;
diff --git a/grub-core/loader/multiboot_mbi2.c
b/grub-core/loader/multiboot_mbi2.c
index d7c19bc..8d66e3f 100644
--- a/grub-core/loader/multiboot_mbi2.c
+++ b/grub-core/loader/multiboot_mbi2.c
@@ -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_efi64 *)
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)
diff --git a/include/grub/i386/multiboot.h b/include/grub/i386/multiboot.h
index a1b9488..807a1de 100644
--- a/include/grub/i386/multiboot.h
+++ b/include/grub/i386/multiboot.h
@@ -30,6 +30,17 @@
#define MULTIBOOT_MBI_REGISTER ebx
#define MULTIBOOT_ARCHITECTURE_CURRENT MULTIBOOT_ARCHITECTURE_I386
+#ifdef GRUB_MACHINE_EFI
+#ifdef __x86_64__
+#define MULTIBOOT_EFI_INITIAL_STATE { .rax = MULTIBOOT_BOOTLOADER_MAGIC,
\
+ .rcx = 0,
\
+ .rdx = 0,
\
+ }
+#define MULTIBOOT_EFI_ENTRY_REGISTER rip
+#define MULTIBOOT_EFI_MBI_REGISTER rbx
+#endif
+#endif
+
#define MULTIBOOT_ELF32_MACHINE EM_386
#define MULTIBOOT_ELF64_MACHINE EM_X86_64
diff --git a/include/grub/i386/relocator.h b/include/grub/i386/relocator.h
index 08c5fda..7ff56ed 100644
--- a/include/grub/i386/relocator.h
+++ b/include/grub/i386/relocator.h
@@ -65,6 +65,20 @@ struct grub_relocator64_state
grub_addr_t cr3;
};
+#ifdef GRUB_MACHINE_EFI
+#ifdef __x86_64__
+struct grub_relocator64_efi_state
+{
+ grub_uint64_t rax;
+ grub_uint64_t rbx;
+ grub_uint64_t rcx;
+ grub_uint64_t rdx;
+ grub_uint64_t rip;
+ grub_uint64_t rsi;
+};
+#endif
+#endif
+
grub_err_t grub_relocator16_boot (struct grub_relocator *rel,
struct grub_relocator16_state state);
@@ -75,4 +89,11 @@ grub_err_t grub_relocator64_boot (struct grub_relocator *rel,
struct grub_relocator64_state state,
grub_addr_t min_addr, grub_addr_t max_addr);
+#ifdef GRUB_MACHINE_EFI
+#ifdef __x86_64__
+grub_err_t grub_relocator64_efi_boot (struct grub_relocator *rel,
+ struct grub_relocator64_efi_state state);
+#endif
+#endif
+
#endif /* ! GRUB_RELOCATOR_CPU_HEADER */
diff --git a/include/multiboot2.h b/include/multiboot2.h
index 3ccff15..75cc99b 100644
--- a/include/multiboot2.h
+++ b/include/multiboot2.h
@@ -69,6 +69,7 @@
#define MULTIBOOT_HEADER_TAG_FRAMEBUFFER 5
#define MULTIBOOT_HEADER_TAG_MODULE_ALIGN 6
#define MULTIBOOT_HEADER_TAG_EFI_BS 7
+#define MULTIBOOT_HEADER_TAG_ENTRY_ADDRESS_EFI64 9
#define MULTIBOOT_ARCHITECTURE_I386 0
#define MULTIBOOT_ARCHITECTURE_MIPS32 4
@@ -133,6 +134,14 @@ struct multiboot_header_tag_entry_address
multiboot_uint32_t entry_addr;
};
+struct multiboot_header_tag_entry_address_efi64
+{
+ multiboot_uint16_t type;
+ multiboot_uint16_t flags;
+ multiboot_uint32_t size;
+ multiboot_uint32_t entry_addr;
+};
+
struct multiboot_header_tag_console_flags
{
multiboot_uint16_t type;
--
1.7.10.4
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