- Added a function to get a GUID HOB data pointer from hob_list

Signed-off-by: Aiden Park aiden.park@intel.com --- arch/x86/cpu/slimbootloader/Makefile | 2 +- arch/x86/cpu/slimbootloader/hob.c | 97 +++++++++++++++++++ .../asm/arch-slimbootloader/slimbootloader.h | 14 +++ 3 files changed, 112 insertions(+), 1 deletion(-) create mode 100644 arch/x86/cpu/slimbootloader/hob.c

diff --git a/arch/x86/cpu/slimbootloader/Makefile b/arch/x86/cpu/slimbootloader/Makefile index 627a721e8c..620fc8a139 100644 --- a/arch/x86/cpu/slimbootloader/Makefile +++ b/arch/x86/cpu/slimbootloader/Makefile @@ -2,4 +2,4 @@ # # Copyright (C) 2019 Intel Corporation <www.intel.com>

-obj-y += car.o slimbootloader.o +obj-y += car.o slimbootloader.o hob.o diff --git a/arch/x86/cpu/slimbootloader/hob.c b/arch/x86/cpu/slimbootloader/hob.c new file mode 100644 index 0000000000..dff86b696e --- /dev/null +++ b/arch/x86/cpu/slimbootloader/hob.c @@ -0,0 +1,97 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright (C) 2019 Intel Corporation <www.intel.com> + */ + +#include <common.h> +#include <asm/arch/slimbootloader.h> + +/* + * This compares two guids and returns its result(0 or others). + * + * @guid1: A pointer to a 128 bit guid + * @guid2: A pointer to a 128 bit guid + * + * @return: 0 if guid1 and guid2 are identical. Otherwise it returns none 0. + */ +static int compare_guid(const struct efi_guid *guid1, + const struct efi_guid *guid2) +{ + return memcmp(guid1, guid2, sizeof(struct efi_guid)); +} + +/** + * This returns a hob header pointer which has a specific type from the given + * hob list. + * + * @type: A specific hob type + * @hob_list: A pointer to a hob list + * + * @return: A hob header pointer if the specified type is found. + * Otherwise, this returns NULL. + */ +static const struct hob_header *get_next_hob_from_hdr(uint type, + const void *hob_list) +{ + const struct hob_header *hdr; + + hdr = hob_list; + + /* Parse the HOB list until end of list or matching type is found */ + while (!end_of_hob(hdr)) { + if (hdr->type == type) + return hdr; + + hdr = get_next_hob(hdr); + } + + return NULL; +} + +/** + * This returns a hob header pointer which has a specific guid from the given + * hob list. + * + * @guid: A pointer to a 128 bit guid + * @hob_list: A pointer to a hob list + * + * @return: A hob header pointer if the specified guid hob entry is found. + * Otherwise, this returns NULL. + */ +static const struct hob_header *get_next_guid_hob(const struct efi_guid *guid, + const void *hob_list) +{ + const struct hob_header *hdr; + struct hob_guid *guid_hob; + + hdr = hob_list; + while ((hdr = get_next_hob_from_hdr(HOB_TYPE_GUID_EXT, hdr))) { + guid_hob = (struct hob_guid *)hdr; + if (!compare_guid(guid, &guid_hob->name)) + break; + hdr = get_next_hob(hdr); + } + + return hdr; +} + +/** + * This returns a pointer to hob data buffer if the given guid hob is found. + * + * @guid: A pointer to a 128 bit guid + * @hob_list: A pointer to a hob list + * + * @return: A pointer to hob data buffer if the specified guid hob entry is + * found. Otherwise, this returns NULL. + */ +void *get_next_guid_hob_data(const struct efi_guid *guid, + const void *hob_list) +{ + const struct hob_header *guid_hob; + + guid_hob = get_next_guid_hob(guid, hob_list); + if (!guid_hob) + return NULL; + + return get_guid_hob_data(guid_hob); +} diff --git a/arch/x86/include/asm/arch-slimbootloader/slimbootloader.h b/arch/x86/include/asm/arch-slimbootloader/slimbootloader.h index 7309a83724..bd1f4ee374 100644 --- a/arch/x86/include/asm/arch-slimbootloader/slimbootloader.h +++ b/arch/x86/include/asm/arch-slimbootloader/slimbootloader.h @@ -7,5 +7,19 @@ #define __SLIMBOOTLOADER_ARCH_H__

#include <common.h> +#include <asm/fsp/fsp_types.h> +#include <asm/fsp/fsp_hob.h> + +/** + * This returns a pointer to hob data buffer if the given guid hob is found. + * + * @guid: A pointer to a 128 bit guid + * @hob_list: A pointer to a hob list + * + * @return: A pointer to hob data buffer if the specified guid hob entry is + * found. Otherwise, this returns NULL. + */ +void *get_next_guid_hob_data(const struct efi_guid *guid, + const void *hob_list);

#endif