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[MULTIBOOT2 DOC PATCH 04/10] multiboot2: Add description of support for
From: |
Daniel Kiper |
Subject: |
[MULTIBOOT2 DOC PATCH 04/10] multiboot2: Add description of support for EFI boot services |
Date: |
Thu, 9 Jun 2016 22:30:38 +0200 |
Signed-off-by: Daniel Kiper <address@hidden>
---
doc/multiboot.texi | 108 +++++++++++++++++++++++++++++++++++++++++++++++++++-
doc/multiboot2.h | 2 +
2 files changed, 108 insertions(+), 2 deletions(-)
diff --git a/doc/multiboot.texi b/doc/multiboot.texi
index e43df93..1583b76 100644
--- a/doc/multiboot.texi
+++ b/doc/multiboot.texi
@@ -534,6 +534,62 @@ The physical address to which the boot loader should jump
in order to
start running the operating system.
@end table
address@hidden EFI i386 entry address tag of Multiboot header
+
address@hidden
address@hidden
+ +-------------------+
+u16 | type = 8 |
+u16 | flags |
+u32 | size |
+u_virt | entry_addr |
+ +-------------------+
address@hidden group
address@hidden example
+
+All of the address fields in this tag are physical addresses.
+The meaning of each is as follows:
+
address@hidden @code
+
address@hidden entry_addr
+The physical address to which the boot loader should jump in order to
+start running EFI i386 compatible operating system code.
address@hidden table
+
+This tag is taken into account only on EFI i386 platforms
+when Multiboot image header contains EFI boot services tag.
+Then entry point specified in ELF header and the entry address
+tag of Multiboot header are ignored.
+
address@hidden EFI amd64 entry address tag of Multiboot header
+
address@hidden
address@hidden
+ +-------------------+
+u16 | type = 9 |
+u16 | flags |
+u32 | size |
+u_virt | entry_addr |
+ +-------------------+
address@hidden group
address@hidden example
+
+All of the address fields in this tag are physical addresses.
+The meaning of each is as follows:
+
address@hidden @code
+
address@hidden entry_addr
+The physical address to which the boot loader should jump in order to
+start running EFI amd64 compatible operating system code.
address@hidden table
+
+This tag is taken into account only on EFI amd64 platforms
+when Multiboot image header contains EFI boot services tag.
+Then entry point specified in ELF header and the entry address
+tag of Multiboot header are ignored.
+
@node Console header tags
@subsection Flags tag
@@ -714,12 +770,60 @@ The OS image must leave interrupts disabled until it sets
up its own
On EFI system boot services must be terminated.
address@hidden EFI i386 machine state with boot services enabled
+
+When the boot loader invokes the 32-bit operating system on EFI i386
+platform and EFI boot services tag together with EFI i386 entry address
+tag are present in the image Multiboot header, the machine must have the
+following state:
+
address@hidden @samp
address@hidden EAX
+Must contain the magic value @samp{0x36d76289}; the presence of this
+value indicates to the operating system that it was loaded by a
+Multiboot-compliant boot loader (e.g. as opposed to another type of
+boot loader that the operating system can also be loaded from).
+
address@hidden EBX
+Must contain the 32-bit physical address of the Multiboot
+information structure provided by the boot loader (@pxref{Boot
+information format}).
address@hidden table
+
+All other processor registers, flag bits and state are set accordingly
+to Unified Extensible Firmware Interface Specification, Version 2.6,
+section 2.3.2, IA-32 Platforms, boot services.
+
address@hidden EFI amd64 machine state with boot services enabled
+
+When the boot loader invokes the 64-bit operating system on EFI amd64
+platform and EFI boot services tag together with EFI amd64 entry address
+tag are present in the image Multiboot header, the machine must have the
+following state:
+
address@hidden @samp
address@hidden RAX
+Must contain the magic value @samp{0x36d76289}; the presence of this
+value indicates to the operating system that it was loaded by a
+Multiboot-compliant boot loader (e.g. as opposed to another type of
+boot loader that the operating system can also be loaded from).
+
address@hidden RBX
+Must contain the 64-bit physical address of the Multiboot
+information structure provided by the boot loader (@pxref{Boot
+information format}).
address@hidden table
+
+All other processor registers, flag bits and state are set accordingly
+to Unified Extensible Firmware Interface Specification, Version 2.6,
+section 2.3.4, x64 Platforms, boot services.
+
@node Boot information format
@section Boot information
@subsection Boot information format
-Upon entry to the operating system, the @code{EBX} register contains the
-physical address of a @dfn{Multiboot information} data structure,
+Upon entry to the operating system, the @code{R5/EBX/RBX} register contains
+the physical address of a @dfn{Multiboot information} data structure,
through which the boot loader communicates vital information to the
operating system. The operating system can use or ignore any parts of
the structure as it chooses; all information passed by the boot loader
diff --git a/doc/multiboot2.h b/doc/multiboot2.h
index 78337f5..240400d 100644
--- a/doc/multiboot2.h
+++ b/doc/multiboot2.h
@@ -69,6 +69,8 @@
#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_EFI32 8
+#define MULTIBOOT_HEADER_TAG_ENTRY_ADDRESS_EFI64 9
#define MULTIBOOT_ARCHITECTURE_I386 0
#define MULTIBOOT_ARCHITECTURE_MIPS32 4
--
1.7.10.4
- [MULTIBOOT2 DOC PATCH 00/10] multiboot2: Update documentation, Daniel Kiper, 2016/06/09
- [MULTIBOOT2 DOC PATCH 01/10] multiboot2: Remove redundant if, Daniel Kiper, 2016/06/09
- [MULTIBOOT2 DOC PATCH 02/10] multiboot2: Clarify meaning of information request header tag, Daniel Kiper, 2016/06/09
- [MULTIBOOT2 DOC PATCH 03/10] multiboot2: Fix description of EFI boot services tag, Daniel Kiper, 2016/06/09
- [MULTIBOOT2 DOC PATCH 05/10] multiboot2: Add description of EFI image handle tags, Daniel Kiper, 2016/06/09
- [MULTIBOOT2 DOC PATCH 04/10] multiboot2: Add description of support for EFI boot services,
Daniel Kiper <=
- [MULTIBOOT2 DOC PATCH 06/10] multiboot2: Add description of support for relocatable images, Daniel Kiper, 2016/06/09
- [MULTIBOOT2 DOC PATCH 09/10] multiboot2: Add me to authors, Daniel Kiper, 2016/06/09
- [MULTIBOOT2 DOC PATCH 08/10] multiboot2: Add C structure alignment and padding consideration section, Daniel Kiper, 2016/06/09
- [MULTIBOOT2 DOC PATCH 07/10] multiboot2: Say that memory maps may not be available on EFI platforms, Daniel Kiper, 2016/06/09