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x86/boot/e820: Add support to determine the E820 type of an address

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Add a function that will return the E820 type associated with an address
range.

Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Borislav Petkov <bp@suse.de>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brijesh Singh <brijesh.singh@amd.com>
Cc: Dave Young <dyoung@redhat.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Larry Woodman <lwoodman@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Matt Fleming <matt@codeblueprint.co.uk>
Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Toshimitsu Kani <toshi.kani@hpe.com>
Cc: kasan-dev@googlegroups.com
Cc: kvm@vger.kernel.org
Cc: linux-arch@vger.kernel.org
Cc: linux-doc@vger.kernel.org
Cc: linux-efi@vger.kernel.org
Cc: linux-mm@kvack.org
Link: http://lkml.kernel.org/r/b797aaa588803bf33263d5dd8c32377668fa931a.1500319216.git.thomas.lendacky@amd.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Tom Lendacky 2017-07-17 16:10:12 -05:00 committed by Ingo Molnar
parent b9d05200bc
commit d68baa3fa6
2 changed files with 25 additions and 3 deletions
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2
arch/x86/include/asm/e820/api.h
View File

@ -39,6 +39,8 @@ extern void e820__setup_pci_gap(void);
extern void e820__reallocate_tables(void);
extern void e820__register_nosave_regions(unsigned long limit_pfn);
extern int e820__get_entry_type(u64 start, u64 end);
/*
* Returns true iff the specified range [start,end) is completely contained inside
* the ISA region.

26
arch/x86/kernel/e820.c
View File

@ -96,7 +96,8 @@ EXPORT_SYMBOL_GPL(e820__mapped_any);
* Note: this function only works correctly once the E820 table is sorted and
* not-overlapping (at least for the range specified), which is the case normally.
*/
bool __init e820__mapped_all(u64 start, u64 end, enum e820_type type)
static struct e820_entry *__e820__mapped_all(u64 start, u64 end,
enum e820_type type)
{
int i;
@ -122,9 +123,28 @@ bool __init e820__mapped_all(u64 start, u64 end, enum e820_type type)
* coverage of the desired range exists:
*/
if (start >= end)
return 1;
return entry;
}
return 0;
return NULL;
}
/*
* This function checks if the entire range <start,end> is mapped with type.
*/
bool __init e820__mapped_all(u64 start, u64 end, enum e820_type type)
{
return __e820__mapped_all(start, end, type);
}
/*
* This function returns the type associated with the range <start,end>.
*/
int e820__get_entry_type(u64 start, u64 end)
{
struct e820_entry *entry = __e820__mapped_all(start, end, 0);
return entry ? entry->type : -EINVAL;
}
/*