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Thu, 09 Jun 2016 13:31:55 -0700 From: Daniel Kiper To: grub-devel@gnu.org, xen-devel@lists.xenproject.org Date: Thu, 9 Jun 2016 22:30:40 +0200 Message-Id: <1465504244-17175-7-git-send-email-daniel.kiper@oracle.com> X-Mailer: git-send-email 1.7.10.4 In-Reply-To: <1465504244-17175-1-git-send-email-daniel.kiper@oracle.com> References: <1465504244-17175-1-git-send-email-daniel.kiper@oracle.com> X-Source-IP: aserv0021.oracle.com [141.146.126.233] Cc: jgross@suse.com, eric.snowberg@oracle.com, arvidjaar@gmail.com, andrew.cooper3@citrix.com, seth.goldberg@oracle.com, phcoder@gmail.com Subject: [Xen-devel] [MULTIBOOT2 DOC PATCH 06/10] multiboot2: Add description of support for relocatable images X-BeenThere: xen-devel@lists.xen.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Errors-To: xen-devel-bounces@lists.xen.org Sender: "Xen-devel" X-Virus-Scanned: ClamAV using ClamSMTP Signed-off-by: Daniel Kiper --- doc/multiboot.texi | 56 ++++++++++++++++++++++++++++++++++++++++++++++++++++ doc/multiboot2.h | 24 ++++++++++++++++++++++ 2 files changed, 80 insertions(+) diff --git a/doc/multiboot.texi b/doc/multiboot.texi index 130176a..f1e0e09 100644 --- a/doc/multiboot.texi +++ b/doc/multiboot.texi @@ -359,6 +359,7 @@ executable header. * Console header tags:: * Module alignment tag:: * EFI boot services tag:: +* Relocatable header tag:: @end menu @@ -681,6 +682,47 @@ u32 | size = 8 | This tag indicates that payload supports starting without terminating boot services. +@node Relocatable header tag +@subsection Relocatable header tag + +@example +@group + +-------------------+ +u16 | type = 10 | +u16 | flags | +u32 | size = 24 | +u32 | min_addr | +u32 | max_addr | +u32 | align | +u32 | preference | + +-------------------+ +@end group +@end example + +This tag indicates that image is relocatable. + +The meaning of each field is as follows: + +@table @code +@item min_addr +Lowest possible physical address at which image should be loaded. +Boot loader cannot load any part of image below this address. + +@item max_addr +Highest possible physical address at which loaded image should end. +Boot loader cannot load any part of image above this address. + +@item align +Image alignment in memory, e.g. 4096 (know on many machines as page). + +@item preference +It contains load address placement suggestion for boot loader. +Boot loader should follow it. @samp{0} means none, @samp{1} means +load image at lowest possible address but not lower than min_addr +and @samp{2} means load image at highest possible address but not +higher than max_addr. +@end table + @node Machine state @section MIPS machine state @@ -1309,6 +1351,20 @@ u64 | pointer | This tag contains pointer to EFI amd64 image handle. Usually it is boot loader image handle. +@subsection Image load base physical address +@example +@group + +-------------------+ +u32 | type = 21 | +u32 | size = 12 | +u32 | load_base_addr | + +-------------------+ +@end group +@end example + +This tag contains image load base physical address. It is +provided only if image has relocatable header tag. + @node Examples @chapter Examples diff --git a/doc/multiboot2.h b/doc/multiboot2.h index b85cb13..b181607 100644 --- a/doc/multiboot2.h +++ b/doc/multiboot2.h @@ -62,6 +62,7 @@ #define MULTIBOOT_TAG_TYPE_EFI_BS 18 #define MULTIBOOT_TAG_TYPE_EFI32_IH 19 #define MULTIBOOT_TAG_TYPE_EFI64_IH 20 +#define MULTIBOOT_TAG_TYPE_LOAD_BASE_ADDR 21 #define MULTIBOOT_HEADER_TAG_END 0 #define MULTIBOOT_HEADER_TAG_INFORMATION_REQUEST 1 @@ -73,11 +74,16 @@ #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_HEADER_TAG_RELOCATABLE 10 #define MULTIBOOT_ARCHITECTURE_I386 0 #define MULTIBOOT_ARCHITECTURE_MIPS32 4 #define MULTIBOOT_HEADER_TAG_OPTIONAL 1 +#define MULTIBOOT_LOAD_PREFERENCE_NONE 0 +#define MULTIBOOT_LOAD_PREFERENCE_LOW 1 +#define MULTIBOOT_LOAD_PREFERENCE_HIGH 2 + #define MULTIBOOT_CONSOLE_FLAGS_CONSOLE_REQUIRED 1 #define MULTIBOOT_CONSOLE_FLAGS_EGA_TEXT_SUPPORTED 2 @@ -162,6 +168,17 @@ struct multiboot_header_tag_module_align multiboot_uint32_t size; }; +struct multiboot_header_tag_relocatable +{ + multiboot_uint16_t type; + multiboot_uint16_t flags; + multiboot_uint32_t size; + multiboot_uint32_t min_addr; + multiboot_uint32_t max_addr; + multiboot_uint32_t align; + multiboot_uint32_t preference; +}; + struct multiboot_color { multiboot_uint8_t red; @@ -388,6 +405,13 @@ struct multiboot_tag_efi64_ih multiboot_uint64_t pointer; }; +struct multiboot_tag_load_base_addr +{ + multiboot_uint32_t type; + multiboot_uint32_t size; + multiboot_uint32_t load_base_addr; +}; + #endif /* ! ASM_FILE */ #endif /* ! MULTIBOOT_HEADER */