FSP builds a series of data structures called the Hand-Off-Blocks (HOBs) as it progresses through initializing the silicon. These data structures conform to the HOB format as described in the Platform Initialization (PI) specification Volume 3 Shared Architectual Elements specification, which is part of the UEFI specification.
Create a simple command to parse the HOB list to display the HOB address, type and length in bytes.
Signed-off-by: Bin Meng bmeng.cn@gmail.com
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Changes in v2: - Use ARRAY_SIZE to indicate the maximum number of HOB tyeps - Remove some unnecessary spaces in the do_hob command output
arch/x86/lib/Makefile | 1 + arch/x86/lib/cmd_hob.c | 67 ++++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 68 insertions(+) create mode 100644 arch/x86/lib/cmd_hob.c
diff --git a/arch/x86/lib/Makefile b/arch/x86/lib/Makefile index 55de788..73262d7 100644 --- a/arch/x86/lib/Makefile +++ b/arch/x86/lib/Makefile @@ -10,6 +10,7 @@ obj-y += bios_asm.o obj-y += bios_interrupts.o obj-$(CONFIG_CMD_BOOTM) += bootm.o obj-y += cmd_boot.o +obj-$(CONFIG_HAVE_FSP) += cmd_hob.o obj-y += gcc.o obj-y += init_helpers.o obj-y += interrupts.o diff --git a/arch/x86/lib/cmd_hob.c b/arch/x86/lib/cmd_hob.c new file mode 100644 index 0000000..7dfa1a1 --- /dev/null +++ b/arch/x86/lib/cmd_hob.c @@ -0,0 +1,67 @@ +/* + * Copyright (C) 2014, Bin Meng bmeng.cn@gmail.com + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <command.h> +#include <linux/compiler.h> +#include <asm/arch/fsp/fsp_support.h> + +DECLARE_GLOBAL_DATA_PTR; + +static char *hob_type[] = { + "reserved", + "Hand-off", + "Memory Allocation", + "Resource Descriptor", + "GUID Extension", + "Firmware Volumn", + "CPU", + "Memory Pool", + "reserved", + "Firmware Volumn 2", + "Load PEIM Unused", + "UEFI Capsule", +}; + +int do_hob(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) +{ + EFI_PEI_HOB_POINTERS hob; + UINT16 type; + char *desc; + int i = 0; + + hob.raw = (UINT8 *)gd->arch.hob_list; + + printf("HOB list address: 0x%08x\n\n", (unsigned int)hob.raw); + + printf("No. | Address | Type | Length in Bytes\n"); + printf("----|----------|---------------------|----------------\n"); + while (!END_OF_HOB(hob)) { + printf("%-3d | %08x | ", i, (unsigned int)hob.raw); + type = hob.hdr->type; + if (type == HOB_TYPE_UNUSED) + desc = "*Unused*"; + else if (type == HOB_TYPE_EOH) + desc = "**END OF HOB**"; + else if (type >= 0 && type <= ARRAY_SIZE(hob_type)) + desc = hob_type[type]; + else + desc = "!!!Invalid Type!!!"; + printf("%-19s | %-15d\n", desc, hob.hdr->len); + hob.raw = GET_NEXT_HOB(hob); + i++; + } + + return 0; +} + +/* -------------------------------------------------------------------- */ + +U_BOOT_CMD( + hob, 1, 1, do_hob, + "print FSP Hand-Off Block information", + "" +);