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

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// 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;
}