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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 */