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x86/boot/e820: Use 'enum e820_type' in 'struct e820_entry'

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Use a stricter type for struct e820_entry. Add a build-time check to make
sure the compiler won't ever pack the enum into a field smaller than
'int'.

No change in functionality.

Cc: Alex Thorlton <athorlton@sgi.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Huang, Ying <ying.huang@intel.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Juergen Gross <jgross@suse.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul Jackson <pj@sgi.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rafael J. Wysocki <rjw@sisk.pl>
Cc: Tejun Heo <tj@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Wei Yang <richard.weiyang@gmail.com>
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Ingo Molnar 2017-01-28 17:01:06 +01:00
parent 7ad1ed8abc
commit 09c5151339
3 changed files with 37 additions and 34 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

31
arch/x86/include/asm/e820/types.h
View File

@ -1,37 +1,6 @@
#ifndef _ASM_E820_TYPES_H
#define _ASM_E820_TYPES_H
enum e820_type {
E820_RAM = 1,
E820_RESERVED = 2,
E820_ACPI = 3,
E820_NVS = 4,
E820_UNUSABLE = 5,
E820_PMEM = 7,
/*
* This is a non-standardized way to represent ADR or
* NVDIMM regions that persist over a reboot.
*
* The kernel will ignore their special capabilities
* unless the CONFIG_X86_PMEM_LEGACY=y option is set.
*
* ( Note that older platforms also used 6 for the same
* type of memory, but newer versions switched to 12 as
* 6 was assigned differently. Some time they will learn... )
*/
E820_PRAM = 12,
/*
* Reserved RAM used by the kernel itself if
* CONFIG_INTEL_TXT=y is enabled, memory of this type
* will be included in the S3 integrity calculation
* and so should not include any memory that the BIOS
* might alter over the S3 transition:
*/
E820_RESERVED_KERN = 128,
};
#include <uapi/asm/e820/types.h>
/*

37
arch/x86/include/uapi/asm/e820/types.h
View File

@ -6,14 +6,45 @@
#ifndef __ASSEMBLY__
enum e820_type {
E820_RAM = 1,
E820_RESERVED = 2,
E820_ACPI = 3,
E820_NVS = 4,
E820_UNUSABLE = 5,
E820_PMEM = 7,
/*
* This is a non-standardized way to represent ADR or
* NVDIMM regions that persist over a reboot.
*
* The kernel will ignore their special capabilities
* unless the CONFIG_X86_PMEM_LEGACY=y option is set.
*
* ( Note that older platforms also used 6 for the same
* type of memory, but newer versions switched to 12 as
* 6 was assigned differently. Some time they will learn... )
*/
E820_PRAM = 12,
/*
* Reserved RAM used by the kernel itself if
* CONFIG_INTEL_TXT=y is enabled, memory of this type
* will be included in the S3 integrity calculation
* and so should not include any memory that the BIOS
* might alter over the S3 transition:
*/
E820_RESERVED_KERN = 128,
};
/*
* A single E820 map entry, describing a memory range of [addr...addr+size-1],
* of 'type' memory type:
*/
struct e820_entry {
__u64 addr;
__u64 size;
__u32 type;
__u64 addr;
__u64 size;
enum e820_type type;
} __attribute__((packed));
#endif /* __ASSEMBLY__ */

3
arch/x86/kernel/e820.c
View File

@ -1164,6 +1164,9 @@ void __init e820__memory_setup(void)
{
char *who;
/* This is a firmware interface ABI - make sure we don't break it: */
BUILD_BUG_ON(sizeof(struct e820_entry) != 20);
who = x86_init.resources.memory_setup();
memcpy(e820_table_firmware, e820_table, sizeof(struct e820_table));