From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tom Lendacky Subject: [PATCH v6 15/34] x86/boot/e820: Add support to determine the E820 type of an address Date: Wed, 07 Jun 2017 14:15:49 -0500 Message-ID: <20170607191549.28645.40861.stgit@tlendack-t1.amdoffice.net> References: <20170607191309.28645.15241.stgit@tlendack-t1.amdoffice.net> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20170607191309.28645.15241.stgit-qCXWGYdRb2BnqfbPTmsdiZQ+2ll4COg0XqFh9Ls21Oc@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: iommu-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org Errors-To: iommu-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org To: linux-arch-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-efi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, kvm-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-doc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, x86-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, kexec-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, kasan-dev-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org, linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org, iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org Cc: Thomas Gleixner , Rik van Riel , Brijesh Singh , Toshimitsu Kani , Arnd Bergmann , Jonathan Corbet , Matt Fleming , Radim =?utf-8?b?S3LEjW3DocWZ?= , Andrey Ryabinin , Ingo Molnar , "Michael S. Tsirkin" , Andy Lutomirski , "H. Peter Anvin" , Borislav Petkov , Paolo Bonzini , Alexander Potapenko , Dave Young , Larry Woodman , Dmitry Vyukov List-Id: linux-efi@vger.kernel.org Add a function that will return the E820 type associated with an address range. Signed-off-by: Tom Lendacky --- arch/x86/include/asm/e820/api.h | 2 ++ arch/x86/kernel/e820.c | 26 +++++++++++++++++++++++--- 2 files changed, 25 insertions(+), 3 deletions(-) diff --git a/arch/x86/include/asm/e820/api.h b/arch/x86/include/asm/e820/api.h index 8e0f8b8..3641f5f 100644 --- a/arch/x86/include/asm/e820/api.h +++ b/arch/x86/include/asm/e820/api.h @@ -38,6 +38,8 @@ 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. diff --git a/arch/x86/kernel/e820.c b/arch/x86/kernel/e820.c index d78a586..46c9b65 100644 --- a/arch/x86/kernel/e820.c +++ b/arch/x86/kernel/e820.c @@ -84,7 +84,8 @@ bool e820__mapped_any(u64 start, u64 end, enum e820_type type) * 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; @@ -110,9 +111,28 @@ 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 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 . + */ +int e820__get_entry_type(u64 start, u64 end) +{ + struct e820_entry *entry = __e820__mapped_all(start, end, 0); + + return entry ? entry->type : -EINVAL; } /*