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x86/boot: Introduce kernel_info.setup_type_max

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This field contains maximal allowed type for setup_data.

Do not bump setup_header version in arch/x86/boot/header.S because it
will be followed by additional changes coming into the Linux/x86 boot
protocol.

Suggested-by: H. Peter Anvin (Intel) <hpa@zytor.com>
Signed-off-by: Daniel Kiper <daniel.kiper@oracle.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Reviewed-by: Ross Philipson <ross.philipson@oracle.com>
Reviewed-by: H. Peter Anvin (Intel) <hpa@zytor.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: ard.biesheuvel@linaro.org
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: dave.hansen@linux.intel.com
Cc: eric.snowberg@oracle.com
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Juergen Gross <jgross@suse.com>
Cc: kanth.ghatraju@oracle.com
Cc: linux-doc@vger.kernel.org
Cc: linux-efi <linux-efi@vger.kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: rdunlap@infradead.org
Cc: ross.philipson@oracle.com
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: x86-ml <x86@kernel.org>
Cc: xen-devel@lists.xenproject.org
Link: https://lkml.kernel.org/r/20191112134640.16035-3-daniel.kiper@oracle.com
This commit is contained in:
Daniel Kiper 2019-11-12 14:46:39 +01:00 committed by Borislav Petkov
parent 2c33c27fd6
commit 00cd1c154d
3 changed files with 16 additions and 1 deletions
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9
Documentation/x86/boot.rst
View File

@ -73,7 +73,7 @@ Protocol 2.14: BURNT BY INCORRECT COMMIT ae7e1238e68f2a472a125673ab506d49158c188
(x86/boot: Add ACPI RSDP address to setup_header)
DO NOT USE!!! ASSUME SAME AS 2.13.
Protocol 2.15: (Kernel 5.5) Added the kernel_info.
Protocol 2.15: (Kernel 5.5) Added the kernel_info and kernel_info.setup_type_max.
============= ============================================================
.. note::
@ -981,6 +981,13 @@ Offset/size: 0x0008/4
This field contains the size of the kernel_info including kernel_info.header
and kernel_info.kernel_info_var_len_data.
============ ==============
Field name: setup_type_max
Offset/size: 0x000c/4
============ ==============
This field contains maximal allowed type for setup_data.
The Image Checksum
==================

5
arch/x86/boot/compressed/kernel_info.S
View File

@ -1,5 +1,7 @@
/* SPDX-License-Identifier: GPL-2.0 */
#include <asm/bootparam.h>
.section ".rodata.kernel_info", "a"
.global kernel_info
@ -12,6 +14,9 @@ kernel_info:
/* Size total. */
.long kernel_info_end - kernel_info
/* Maximal allowed type for setup_data. */
.long SETUP_TYPE_MAX
kernel_info_var_len_data:
/* Empty for time being... */
kernel_info_end:

3
arch/x86/include/uapi/asm/bootparam.h
View File

@ -11,6 +11,9 @@
#define SETUP_APPLE_PROPERTIES 5
#define SETUP_JAILHOUSE 6
/* max(SETUP_*) */
#define SETUP_TYPE_MAX SETUP_JAILHOUSE
/* ram_size flags */
#define RAMDISK_IMAGE_START_MASK 0x07FF
#define RAMDISK_PROMPT_FLAG 0x8000