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MdePkg: Add reserved mem fdt helpers

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Devicetree defines a short hand way of defining reserved memory
ranges. Add APIs to access such nodes

Signed-off-by: Dhaval Sharma <dhaval@rivosinc.com>
This commit is contained in:
Dhaval 2024-06-05 10:00:32 +05:30 committed by mergify[bot]
parent 099aff9137
commit 043045cd6e
2 changed files with 75 additions and 0 deletions
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34
MdePkg/Include/Library/FdtLib.h
View File

@ -247,6 +247,40 @@ FdtSubnodeOffsetNameLen (
IN INT32 NameLength
);
/**
Returns number of reserved ranges.
@param[in] Fdt The pointer to FDT blob.
@return The number of reserved ranges.
**/
INTN
EFIAPI
FdtNumRsv (
IN CONST VOID *Fdt
);
/**
Returns reserved ranges.
@param[in] *Fdt The pointer to FDT blob.
@param[in] Index Reserved entry index in the table.
@param[out] Addr Address returned
@param[out] *Size Pointer to size of the address range
@return Returns reserved range.
**/
INTN
EFIAPI
FdtGetMemRsv (
IN CONST VOID *Fdt,
IN INTN Index,
OUT UINT64 *Addr,
OUT UINT64 *Size
);
/**
Returns a offset of first node which includes the given property name and value.

41
MdePkg/Library/BaseFdtLib/FdtLib.c
View File

@ -7,6 +7,7 @@
**/
#include <libfdt/libfdt/libfdt.h>
#include <Uefi/UefiBaseType.h>
/**
Convert UINT16 data of the FDT blob to little-endian
@ -205,6 +206,46 @@ FdtNextSubnode (
return fdt_next_subnode (Fdt, Offset);
}
/**
Returns number of reserved mem nodes
@param[in] Fdt The pointer to FDT blob.
@return total reserved mem nodes
**/
INTN
EFIAPI
FdtNumRsv (
IN CONST VOID *Fdt
)
{
return fdt_num_mem_rsv (Fdt);
}
/**
Returns reserved ranges.
@param[in] *Fdt The pointer to FDT blob.
@param[in] Index Reserved entry index in the table.
@param[out] Addr Address returned
@param[out] *Size Pointer to size of the address range
@return Returns reserved range.
**/
INTN
EFIAPI
FdtGetMemRsv (
IN CONST VOID *Fdt,
IN INTN Index,
OUT EFI_PHYSICAL_ADDRESS *Addr,
OUT UINT64 *Size
)
{
return fdt_get_mem_rsv (Fdt, Index, Addr, Size);
}
/**
Returns a offset of first node which includes the given name.