From e01aed47d6a0e4d99e886d80b885fe0898850357 Mon Sep 17 00:00:00 2001 From: Ilias Apalodimas Date: Thu, 23 Jul 2020 15:49:49 +0300 Subject: efi_loader: Enable run-time variable support for tee based variables We recently added functions for storing/restoring variables from a file to a memory backed buffer marked as __efi_runtime_data commit f1f990a8c958 ("efi_loader: memory buffer for variables") commit 5f7dcf079de8 ("efi_loader: UEFI variable persistence") Using the same idea we now can support GetVariable() and GetNextVariable() on the OP-TEE based variables as well. So let's re-arrange the code a bit and move the commmon code for accessing variables out of efi_variable.c. Create common functions for reading variables from memory that both implementations can use on run-time. Then just use those functions in the run-time variants of the OP-TEE based EFI variable implementation and initialize the memory buffer on ExitBootServices() Signed-off-by: Ilias Apalodimas Reviewed-by: Heinrich Schuchardt --- include/efi_variable.h | 74 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 74 insertions(+) (limited to 'include') diff --git a/include/efi_variable.h b/include/efi_variable.h index 2c629e4dca..60491cb640 100644 --- a/include/efi_variable.h +++ b/include/efi_variable.h @@ -142,6 +142,22 @@ struct efi_var_file { */ efi_status_t efi_var_to_file(void); +/** + * efi_var_collect() - collect variables in buffer + * + * A buffer is allocated and filled with variables in a format ready to be + * written to disk. + * + * @bufp: pointer to pointer of buffer with collected variables + * @lenp: pointer to length of buffer + * @check_attr_mask: bitmask with required attributes of variables to be collected. + * variables are only collected if all of the required + * attributes are set. + * Return: status code + */ +efi_status_t __maybe_unused efi_var_collect(struct efi_var_file **bufp, loff_t *lenp, + u32 check_attr_mask); + /** * efi_var_restore() - restore EFI variables from buffer * @@ -233,4 +249,62 @@ efi_status_t efi_init_secure_state(void); */ enum efi_auth_var_type efi_auth_var_get_type(u16 *name, const efi_guid_t *guid); +/** + * efi_get_next_variable_name_mem() - Runtime common code across efi variable + * implementations for GetNextVariable() + * from the cached memory copy + * @variable_name_size: size of variable_name buffer in byte + * @variable_name: name of uefi variable's name in u16 + * @vendor: vendor's guid + * + * Return: status code + */ +efi_status_t __efi_runtime +efi_get_next_variable_name_mem(efi_uintn_t *variable_name_size, u16 *variable_name, + efi_guid_t *vendor); +/** + * efi_get_variable_mem() - Runtime common code across efi variable + * implementations for GetVariable() from + * the cached memory copy + * + * @variable_name: name of the variable + * @vendor: vendor GUID + * @attributes: attributes of the variable + * @data_size: size of the buffer to which the variable value is copied + * @data: buffer to which the variable value is copied + * @timep: authentication time (seconds since start of epoch) + * Return: status code + + */ +efi_status_t __efi_runtime +efi_get_variable_mem(u16 *variable_name, const efi_guid_t *vendor, u32 *attributes, + efi_uintn_t *data_size, void *data, u64 *timep); + +/** + * efi_get_variable_runtime() - runtime implementation of GetVariable() + * + * @variable_name: name of the variable + * @guid: vendor GUID + * @attributes: attributes of the variable + * @data_size: size of the buffer to which the variable value is copied + * @data: buffer to which the variable value is copied + * Return: status code + */ +efi_status_t __efi_runtime EFIAPI +efi_get_variable_runtime(u16 *variable_name, const efi_guid_t *guid, + u32 *attributes, efi_uintn_t *data_size, void *data); + +/** + * efi_get_next_variable_name_runtime() - runtime implementation of + * GetNextVariable() + * + * @variable_name_size: size of variable_name buffer in byte + * @variable_name: name of uefi variable's name in u16 + * @guid: vendor's guid + * Return: status code + */ +efi_status_t __efi_runtime EFIAPI +efi_get_next_variable_name_runtime(efi_uintn_t *variable_name_size, + u16 *variable_name, efi_guid_t *guid); + #endif -- cgit v1.2.3