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    Subject[PATCH v6 15/34] x86/boot/e820: Add support to determine the E820 type of an address
    Date
    Add a function that will return the E820 type associated with an address
    range.

    Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
    ---
    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 <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;
    }

    /*
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