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efi: add EFI_SYSTEM_TABLE_POINTER for debug

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Add EFI_SYSTEM_TABLE_POINTER structure for remote debugger to locate
the address of EFI_SYSTEM_TABLE.

This feature is described in UEFI SPEC version 2.10. Section 18.4.2.
The implementation ensures support for hardware-assisted debugging and
provides a standardized mechanism for debuggers to discover the EFI
system table.

Cc: Peter Robinson <pbrobinson@gmail.com>
Cc: Simon Glass <sjg@chromium.org>
Signed-off-by: Ying-Chun Liu (PaulLiu) <paul.liu@linaro.org>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Tested-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de> # change memset(systab_pointer, 0 ...) -> systab_pointer->crc32 = 0;
Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
This commit is contained in:
Ying-Chun Liu (PaulLiu) 2025-07-03 07:28:07 +01:00 committed by Ilias Apalodimas
parent 46a564d689
commit aaf7be96c2
6 changed files with 75 additions and 0 deletions
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16
include/efi_api.h
View File

@ -259,6 +259,22 @@ struct efi_capsule_result_variable_header {
efi_status_t capsule_status;
} __packed;
/**
* struct efi_system_table_pointer - struct to store the pointer of system
* table.
* @signature: The signature of this struct.
* @efi_system_table_base: The physical address of System Table.
* @crc32: CRC32 checksum
*
* This struct is design for hardware debugger to search through memory to
* get the address of EFI System Table.
*/
struct efi_system_table_pointer {
u64 signature;
efi_physical_addr_t efi_system_table_base;
u32 crc32;
};
struct efi_memory_range {
efi_physical_addr_t address;
u64 length;

2
include/efi_loader.h
View File

@ -643,6 +643,8 @@ efi_status_t efi_tcg2_measure_dtb(void *dtb);
efi_status_t efi_root_node_register(void);
/* Called by bootefi to initialize runtime */
efi_status_t efi_initialize_system_table(void);
/* Called by bootefi to initialize debug */
efi_status_t efi_initialize_system_table_pointer(void);
/* efi_runtime_detach() - detach unimplemented runtime functions */
void efi_runtime_detach(void);
/* efi_convert_pointer() - convert pointer to virtual address */

9
lib/efi_loader/Kconfig
View File

@ -71,6 +71,15 @@ config EFI_SECURE_BOOT
config EFI_SIGNATURE_SUPPORT
bool
config EFI_DEBUG_SUPPORT
bool "EFI Debug Support"
default y if !HAS_BOARD_SIZE_LIMIT
help
Select this option if you want to setup the EFI Debug Support
Table and the EFI_SYSTEM_TABLE_POINTER which is used by the debug
agent or an external debugger to determine loaded image information
in a quiescent manner.
menu "UEFI services"
config EFI_GET_TIME

1
lib/efi_loader/Makefile
View File

@ -70,6 +70,7 @@ obj-$(CONFIG_EFI_RISCV_BOOT_PROTOCOL) += efi_riscv.o
obj-$(CONFIG_EFI_LOAD_FILE2_INITRD) += efi_load_initrd.o
obj-$(CONFIG_EFI_SIGNATURE_SUPPORT) += efi_signature.o
obj-$(CONFIG_EFI_ECPT) += efi_conformance.o
obj-$(CONFIG_EFI_DEBUG_SUPPORT) += efi_debug_support.o
EFI_VAR_SEED_FILE := $(subst $\",,$(CONFIG_EFI_VAR_SEED_FILE))
$(obj)/efi_var_seed.o: $(srctree)/$(EFI_VAR_SEED_FILE)

40
lib/efi_loader/efi_debug_support.c Normal file
View File

@ -0,0 +1,40 @@
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* EFI debug support
*
* Copyright (c) 2025 Ying-Chun Liu, Linaro Ltd. <paul.liu@linaro.org>
*/
#include <efi_loader.h>
#include <linux/sizes.h>
#include <u-boot/crc.h>
struct efi_system_table_pointer __efi_runtime_data * systab_pointer = NULL;
/**
* efi_initialize_system_table_pointer() - Initialize system table pointer
*
* Return: status code
*/
efi_status_t efi_initialize_system_table_pointer(void)
{
/* Allocate efi_system_table_pointer structure with 4MB alignment. */
systab_pointer = efi_alloc_aligned_pages(sizeof(struct efi_system_table_pointer),
EFI_RUNTIME_SERVICES_DATA,
SZ_4M);
if (!systab_pointer) {
log_err("Installing EFI system table pointer failed\n");
return EFI_OUT_OF_RESOURCES;
}
systab_pointer->crc32 = 0;
systab_pointer->signature = EFI_SYSTEM_TABLE_SIGNATURE;
systab_pointer->efi_system_table_base = (uintptr_t)&systab;
systab_pointer->crc32 = crc32(0,
(const unsigned char *)systab_pointer,
sizeof(struct efi_system_table_pointer));
return EFI_SUCCESS;
}

7
lib/efi_loader/efi_setup.c
View File

@ -278,6 +278,13 @@ efi_status_t efi_init_obj_list(void)
if (ret != EFI_SUCCESS)
goto out;
/* Initialize system table pointer */
if (IS_ENABLED(CONFIG_EFI_DEBUG_SUPPORT)) {
ret = efi_initialize_system_table_pointer();
if (ret != EFI_SUCCESS)
goto out;
}
if (IS_ENABLED(CONFIG_EFI_ECPT)) {
ret = efi_ecpt_register();
if (ret != EFI_SUCCESS)