This patch adds support to return the E820 type associated with an address range. Signed-off-by: Tom Lendacky <thomas.lendacky@xxxxxxx> --- arch/x86/include/asm/e820/api.h | 2 ++ arch/x86/include/asm/e820/types.h | 2 ++ arch/x86/kernel/e820.c | 26 +++++++++++++++++++++++--- 3 files changed, 27 insertions(+), 3 deletions(-) diff --git a/arch/x86/include/asm/e820/api.h b/arch/x86/include/asm/e820/api.h index 8e0f8b8..7c1bdc9 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 enum e820_type 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/include/asm/e820/types.h b/arch/x86/include/asm/e820/types.h index 4adeed0..bf49591 100644 --- a/arch/x86/include/asm/e820/types.h +++ b/arch/x86/include/asm/e820/types.h @@ -7,6 +7,8 @@ * These are the E820 types known to the kernel: */ enum e820_type { + E820_TYPE_INVALID = 0, + E820_TYPE_RAM = 1, E820_TYPE_RESERVED = 2, E820_TYPE_ACPI = 3, diff --git a/arch/x86/kernel/e820.c b/arch/x86/kernel/e820.c index 6e9b26f..2ee7ee2 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 <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) ? 1 : 0; +} + +/* + * This function returns the type associated with the range <start,end>. + */ +enum e820_type e820__get_entry_type(u64 start, u64 end) +{ + struct e820_entry *entry = __e820__mapped_all(start, end, 0); + + return entry ? entry->type : E820_TYPE_INVALID; } /* -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx"> email@xxxxxxxxx </a>