lib/efi_loader/efi_variable.c

1 // SPDX-License-Identifier: GPL-2.0+
19  * Mapping between EFI variables and u-boot variables:
25  *   efi_8be4df61-93ca-11d2-aa0d-00e098032b8c_OsIndicationsSupported=
27  *   efi_8be4df61-93ca-11d2-aa0d-00e098032b8c_BootOrder=
33  *   + ro   - read-only
34  *   + boot - boot-services access
35  *   + run  - runtime access
44  *   + utf8 - raw utf8 string
45  *   + blob - arbitrary length hex string
51 #define PREFIX_LEN (strlen("efi_xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx_"))
54  * efi_to_native() - convert the UEFI variable name and vendor GUID to U-Boot
57  * The U-Boot variable name is a concatenation of prefix 'efi', the hexstring
58  * encoded vendor GUID, and the UTF-8 encoded UEFI variable name separated by
59  * underscores, e.g. 'efi_8be4df61-93ca-11d2-aa0d-00e098032b8c_BootOrder'.
61  * @native:		pointer to pointer to U-Boot variable name
85  * prefix() - skip over prefix
102  * parse_attr() - decode attributes part of variable value
104  * Convert the string encoded attributes of a UEFI variable to a bit mask.
107  * @str:	value of U-Boot variable
109  * Return:	pointer to remainder of U-Boot variable value
149  * efi_efi_get_variable() - retrieve value of a UEFI variable
245  * parse_uboot_variable() - parse a u-boot variable and get uefi-related
247  * @variable:		whole data of u-boot variable (ie. name=value)
249  * @variable_name:	name of uefi variable in u16, null-terminated
253  * A uefi variable is encoded into a u-boot variable as described above.
254  * This function parses such a u-boot variable and retrieve uefi-related
260 			otherwise non-zero status code
284 	name_len = end - name;  in parse_uboot_variable()
298 	c = *(name - 1);  in parse_uboot_variable()
299 	*(name - 1) = '\0'; /* guid need be null-terminated here */  in parse_uboot_variable()
301 	*(name - 1) = c;  in parse_uboot_variable()
310  * efi_get_next_variable_name() - enumerate the current variable names
341 		/* check null-terminated string */  in efi_get_next_variable_name()
348 		/* search for the last-returned variable */  in efi_get_next_variable_name()
382 		snprintf(regex, 256, "efi_.*-.*-.*-.*-.*_.*");  in efi_get_next_variable_name()
400  * efi_efi_set_variable() - set value of a UEFI variable
470 		u32 attr = 1 << (ffs(attributes) - 1);  in efi_set_variable()