smallsolar/u-boot
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

efi_loader: Add runtime services

Browse Source 
After booting has finished, EFI allows firmware to still interact with the OS
using the "runtime services". These callbacks live in a separate address space,
since they are available long after U-Boot has been overwritten by the OS.

This patch adds enough framework for arbitrary code inside of U-Boot to become
a runtime service with the right section attributes set. For now, we don't make
use of it yet though.

We could maybe in the future map U-boot environment variables to EFI variables
here.

Signed-off-by: Alexander Graf <agraf@suse.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
Tested-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Alexander Graf
2016-03-04 01:10:01 +01:00
committed by Tom Rini
parent c1311ad4e0
commit 50149ea37a
9 changed files with 398 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

17
include/efi_loader.h
View File

@@ -30,6 +30,7 @@
#define EFI_EXIT(ret) efi_exit_func(ret);
extern struct efi_runtime_services efi_runtime_services;
extern struct efi_system_table systab;
extern const struct efi_simple_text_output_protocol efi_con_out;
@@ -40,6 +41,9 @@ extern const efi_guid_t efi_guid_console_control;
extern const efi_guid_t efi_guid_device_path;
extern const efi_guid_t efi_guid_loaded_image;
extern unsigned int __efi_runtime_start, __efi_runtime_stop;
extern unsigned int __efi_runtime_rel_start, __efi_runtime_rel_stop;
/*
* While UEFI objects can have callbacks, you can also call functions on
* protocols (classes) themselves. This struct maps a protocol GUID to its
@@ -101,9 +105,22 @@ void efi_save_gd(void);
void efi_restore_gd(void);
/* Called from EFI_EXIT on callback exit to restore the gd register */
efi_status_t efi_exit_func(efi_status_t ret);
/* Call this to relocate the runtime section to an address space */
void efi_runtime_relocate(ulong offset, struct efi_mem_desc *map);
/*
* Use these to indicate that your code / data should go into the EFI runtime
* section and thus still be available when the OS is running
*/
#define EFI_RUNTIME_DATA __attribute__ ((section ("efi_runtime_data")))
#define EFI_RUNTIME_TEXT __attribute__ ((section ("efi_runtime_text")))
#else /* defined(EFI_LOADER) && !defined(CONFIG_SPL_BUILD) */
/* Without CONFIG_EFI_LOADER we don't have a runtime section, stub it out */
#define EFI_RUNTIME_DATA
#define EFI_RUNTIME_TEXT
/* No loader configured, stub out EFI_ENTRY */
static inline void efi_restore_gd(void) { }