From bcfb0e22a8add1fcc99b63adfe2147802f2e1c77 Mon Sep 17 00:00:00 2001 From: Heinrich Schuchardt Date: Sun, 29 Jul 2018 15:10:11 +0200 Subject: [PATCH] efi_loader: document runtime functions Add comments for runtime service functions. Signed-off-by: Heinrich Schuchardt Signed-off-by: Alexander Graf --- lib/efi_loader/efi_runtime.c | 153 ++++++++++++++++++++++++++++++++++- 1 file changed, 149 insertions(+), 4 deletions(-) diff --git a/lib/efi_loader/efi_runtime.c b/lib/efi_loader/efi_runtime.c index 633e4cc3e5..27136cbedd 100644 --- a/lib/efi_loader/efi_runtime.c +++ b/lib/efi_loader/efi_runtime.c @@ -96,6 +96,20 @@ void __efi_runtime efi_update_table_header_crc32(struct efi_table_hdr *table) table->headersize); } +/** + * efi_reset_system_boottime() - reset system at boottime + * + * This function implements the ResetSystem() runtime service before + * SetVirtualAddressMap() is called. + * + * See the Unified Extensible Firmware Interface (UEFI) specification for + * details. + * + * @reset_type: type of reset to perform + * @reset_status: status code for the reset + * @data_size: size of reset_data + * @reset_data: information about the reset + */ static void EFIAPI efi_reset_system_boottime( enum efi_reset_type reset_type, efi_status_t reset_status, @@ -130,15 +144,17 @@ static void EFIAPI efi_reset_system_boottime( } /** - * efi_get_time_boottime - get current time + * efi_get_time_boottime() - get current time at boottime + * + * This function implements the GetTime runtime service before + * SetVirtualAddressMap() is called. * - * This function implements the GetTime runtime service. * See the Unified Extensible Firmware Interface (UEFI) specification * for details. * * @time: pointer to structure to receive current time * @capabilities: pointer to structure to receive RTC properties - * Return Value: status code + * Returns: status code */ static efi_status_t EFIAPI efi_get_time_boottime( struct efi_time *time, @@ -191,8 +207,22 @@ out: #endif } -/* Boards may override the helpers below to implement RTS functionality */ +/** + * efi_reset_system() - reset system + * + * This function implements the ResetSystem() runtime service after + * SetVirtualAddressMap() is called. It only executes an endless loop. + * Boards may override the helpers below to implement reset functionality. + * + * See the Unified Extensible Firmware Interface (UEFI) specification for + * details. + * + * @reset_type: type of reset to perform + * @reset_status: status code for the reset + * @data_size: size of reset_data + * @reset_data: information about the reset + */ void __weak __efi_runtime EFIAPI efi_reset_system( enum efi_reset_type reset_type, efi_status_t reset_status, @@ -202,11 +232,30 @@ void __weak __efi_runtime EFIAPI efi_reset_system( while (1) { } } +/** + * efi_reset_system_init() - initialize the reset driver + * + * Boards may override this function to initialize the reset driver. + */ efi_status_t __weak efi_reset_system_init(void) { return EFI_SUCCESS; } +/** + * efi_get_time() - get current time + * + * This function implements the GetTime runtime service after + * SetVirtualAddressMap() is called. As the U-Boot driver are not available + * anymore only an error code is returned. + * + * See the Unified Extensible Firmware Interface (UEFI) specification + * for details. + * + * @time: pointer to structure to receive current time + * @capabilities: pointer to structure to receive RTC properties + * Returns: status code + */ efi_status_t __weak __efi_runtime EFIAPI efi_get_time( struct efi_time *time, struct efi_time_cap *capabilities) @@ -353,6 +402,20 @@ void efi_runtime_relocate(ulong offset, struct efi_mem_desc *map) invalidate_icache_all(); } +/** + * efi_set_virtual_address_map() - change from physical to virtual mapping + * + * This function implements the SetVirtualAddressMap() runtime service. + * + * See the Unified Extensible Firmware Interface (UEFI) specification for + * details. + * + * @memory_map_size: size of the virtual map + * @descriptor_size: size of an entry in the map + * @descriptor_version: version of the map entries + * @virtmap: virtual address mapping information + * Return: status code + */ static efi_status_t EFIAPI efi_set_virtual_address_map( unsigned long memory_map_size, unsigned long descriptor_size, @@ -419,6 +482,16 @@ static efi_status_t EFIAPI efi_set_virtual_address_map( return EFI_EXIT(EFI_INVALID_PARAMETER); } +/** + * efi_add_runtime_mmio() - add memory-mapped IO region + * + * This function adds a memory-mapped IO region to the memory map to make it + * available at runtime. + * + * @mmio_ptr: address of the memory-mapped IO region + * @len: size of thememory-mapped IO region + * Returns: status code + */ efi_status_t efi_add_runtime_mmio(void *mmio_ptr, u64 len) { struct efi_runtime_mmio_list *newmmio; @@ -461,21 +534,61 @@ efi_status_t efi_add_runtime_mmio(void *mmio_ptr, u64 len) * address map calls. */ +/** + * efi_unimplemented() - replacement function, returns EFI_UNSUPPORTED + * + * This function is used after SetVirtualAddressMap() is called as replacement + * for services that are not available anymore due to constraints of the U-Boot + * implementation. + * + * Return: EFI_UNSUPPORTED + */ static efi_status_t __efi_runtime EFIAPI efi_unimplemented(void) { return EFI_UNSUPPORTED; } +/** + * efi_device_error() - replacement function, returns EFI_DEVICE_ERROR + * + * This function is used after SetVirtualAddressMap() is called as replacement + * for services that are not available anymore due to constraints of the U-Boot + * implementation. + * + * Return: EFI_DEVICE_ERROR + */ static efi_status_t __efi_runtime EFIAPI efi_device_error(void) { return EFI_DEVICE_ERROR; } +/** + * efi_invalid_parameter() - replacement function, returns EFI_INVALID_PARAMETER + * + * This function is used after SetVirtualAddressMap() is called as replacement + * for services that are not available anymore due to constraints of the U-Boot + * implementation. + * + * Return: EFI_INVALID_PARAMETER + */ static efi_status_t __efi_runtime EFIAPI efi_invalid_parameter(void) { return EFI_INVALID_PARAMETER; } +/** + * efi_update_capsule() - process information from operating system + * + * This function implements the UpdateCapsule() runtime service. + * + * See the Unified Extensible Firmware Interface (UEFI) specification for + * details. + * + * @capsule_header_array: pointer to array of virtual pointers + * @capsule_count: number of pointers in capsule_header_array + * @scatter_gather_list: pointer to arry of physical pointers + * Returns: status code + */ efi_status_t __efi_runtime EFIAPI efi_update_capsule( struct efi_capsule_header **capsule_header_array, efi_uintn_t capsule_count, @@ -484,6 +597,20 @@ efi_status_t __efi_runtime EFIAPI efi_update_capsule( return EFI_UNSUPPORTED; } +/** + * efi_query_capsule_caps() - check if capsule is supported + * + * This function implements the QueryCapsuleCapabilities() runtime service. + * + * See the Unified Extensible Firmware Interface (UEFI) specification for + * details. + * + * @capsule_header_array: pointer to array of virtual pointers + * @capsule_count: number of pointers in capsule_header_array + * @capsule_size: maximum capsule size + * @reset_type: type of reset needed for capsule update + * Returns: status code + */ efi_status_t __efi_runtime EFIAPI efi_query_capsule_caps( struct efi_capsule_header **capsule_header_array, efi_uintn_t capsule_count, @@ -493,6 +620,24 @@ efi_status_t __efi_runtime EFIAPI efi_query_capsule_caps( return EFI_UNSUPPORTED; } +/** + * efi_query_variable_info() - get information about EFI variables + * + * This function implements the QueryVariableInfo() runtime service. + * + * See the Unified Extensible Firmware Interface (UEFI) specification for + * details. + * + * @attributes: bitmask to select variables to be + * queried + * @maximum_variable_storage_size: maximum size of storage area for the + * selected variable types + * @remaining_variable_storage_size: remaining size of storage are for the + * selected variable types + * @maximum_variable_size: maximum size of a variable of the + * selected type + * Returns: status code + */ efi_status_t __efi_runtime EFIAPI efi_query_variable_info( u32 attributes, u64 *maximum_variable_storage_size, -- 2.39.5