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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;
struct efi_debug_image_info_table_header efi_m_debug_info_table_header = {
0,
0,
NULL
};
/* efi_m_max_table_entries is the maximum entries allocated for
* the efi_m_debug_info_table_header.efi_debug_image_info_table.
*/
static u32 efi_m_max_table_entries;
#define EFI_DEBUG_TABLE_ENTRY_SIZE (sizeof(union efi_debug_image_info *))
/**
* 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;
}
/**
* efi_core_new_debug_image_info_entry() - Add a new efi_loaded_image structure to the
* efi_debug_image_info table.
*
* @image_info_type: type of debug image information
* @loaded_image: pointer to the loaded image protocol for the image
* being loaded
* @image_handle: image handle for the image being loaded
*
* Re-Allocates the table if it's not large enough to accommodate another
* entry.
*
* Return: status code
**/
efi_status_t efi_core_new_debug_image_info_entry(u32 image_info_type,
struct efi_loaded_image *loaded_image,
efi_handle_t image_handle)
{
union efi_debug_image_info **table;
u32 index;
u32 table_size;
efi_status_t ret;
/* Set the flag indicating that we're in the process of updating
* the table.
*/
efi_m_debug_info_table_header.update_status |=
EFI_DEBUG_IMAGE_INFO_UPDATE_IN_PROGRESS;
table = &efi_m_debug_info_table_header.efi_debug_image_info_table;
if (efi_m_debug_info_table_header.table_size >= efi_m_max_table_entries) {
/* table is full, re-allocate the buffer increasing the size
* by 4 KiB.
*/
table_size = efi_m_max_table_entries * EFI_DEBUG_TABLE_ENTRY_SIZE;
ret = efi_realloc((void **)table, table_size + EFI_PAGE_SIZE);
if (ret != EFI_SUCCESS) {
efi_m_debug_info_table_header.update_status &=
~EFI_DEBUG_IMAGE_INFO_UPDATE_IN_PROGRESS;
return ret;
}
/* Enlarge the max table entries and set the first empty
* entry index to be the original max table entries.
*/
efi_m_max_table_entries +=
EFI_PAGE_SIZE / EFI_DEBUG_TABLE_ENTRY_SIZE;
}
/* We always put the next entry at the end of the currently consumed
* table (i.e. first free entry)
*/
index = efi_m_debug_info_table_header.table_size;
/* Allocate data for new entry. */
ret = efi_allocate_pool(EFI_BOOT_SERVICES_DATA,
sizeof(union efi_debug_image_info),
(void **)(&(*table)[index].normal_image));
if (ret == EFI_SUCCESS && (*table)[index].normal_image) {
/* Update the entry. */
(*table)[index].normal_image->image_info_type = image_info_type;
(*table)[index].normal_image->loaded_image_protocol_instance =
loaded_image;
(*table)[index].normal_image->image_handle = image_handle;
/* Increase the number of EFI_DEBUG_IMAGE_INFO elements and
* set the efi_m_debug_info_table_header in modified status.
*/
efi_m_debug_info_table_header.table_size++;
efi_m_debug_info_table_header.update_status |=
EFI_DEBUG_IMAGE_INFO_TABLE_MODIFIED;
} else {
log_err("Adding new efi_debug_image_info failed\n");
return ret;
}
efi_m_debug_info_table_header.update_status &=
~EFI_DEBUG_IMAGE_INFO_UPDATE_IN_PROGRESS;
return EFI_SUCCESS;
}
/**
* efi_core_remove_debug_image_info_entry() - Remove an efi_debug_image_info entry.
*
* @image_handle: image handle for the image being removed
**/
void efi_core_remove_debug_image_info_entry(efi_handle_t image_handle)
{
union efi_debug_image_info *table;
u32 index;
efi_m_debug_info_table_header.update_status |=
EFI_DEBUG_IMAGE_INFO_UPDATE_IN_PROGRESS;
table = efi_m_debug_info_table_header.efi_debug_image_info_table;
for (index = 0; index < efi_m_max_table_entries; index++) {
if (table[index].normal_image &&
table[index].normal_image->image_handle == image_handle) {
/* Found a match. Free up the table entry.
* Move the tail of the table one slot to the front.
*/
efi_free_pool(table[index].normal_image);
memmove(&table[index],
&table[index + 1],
(efi_m_debug_info_table_header.table_size -
index - 1) * EFI_DEBUG_TABLE_ENTRY_SIZE);
/* Decrease the number of EFI_DEBUG_IMAGE_INFO
* elements and set the efi_m_debug_info_table_header
* in modified status.
*/
efi_m_debug_info_table_header.table_size--;
table[efi_m_debug_info_table_header.table_size].normal_image =
NULL;
efi_m_debug_info_table_header.update_status |=
EFI_DEBUG_IMAGE_INFO_TABLE_MODIFIED;
break;
}
}
efi_m_debug_info_table_header.update_status &=
~EFI_DEBUG_IMAGE_INFO_UPDATE_IN_PROGRESS;
}
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