mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-11 22:03:15 +00:00
cc2ed79182
For debug messages inside EFI API functions we should use the EFI_PRINT macro which gives us well aligned output like: EFI: Entry efi_get_variable("PlatformLang" ...) EFI: get 'efi_8be4df61-93ca-11d2-aa0d-00e098032b8c_PlatformLang' EFI: Exit: efi_get_variable: 14 Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
498 lines
12 KiB
C
498 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* EFI utils
|
|
*
|
|
* Copyright (c) 2017 Rob Clark
|
|
*/
|
|
|
|
#include <malloc.h>
|
|
#include <charset.h>
|
|
#include <efi_loader.h>
|
|
#include <hexdump.h>
|
|
#include <environment.h>
|
|
#include <search.h>
|
|
#include <uuid.h>
|
|
|
|
#define READ_ONLY BIT(31)
|
|
|
|
/*
|
|
* Mapping between EFI variables and u-boot variables:
|
|
*
|
|
* efi_$guid_$varname = {attributes}(type)value
|
|
*
|
|
* For example:
|
|
*
|
|
* efi_8be4df61-93ca-11d2-aa0d-00e098032b8c_OsIndicationsSupported=
|
|
* "{ro,boot,run}(blob)0000000000000000"
|
|
* efi_8be4df61-93ca-11d2-aa0d-00e098032b8c_BootOrder=
|
|
* "(blob)00010000"
|
|
*
|
|
* The attributes are a comma separated list of these possible
|
|
* attributes:
|
|
*
|
|
* + ro - read-only
|
|
* + boot - boot-services access
|
|
* + run - runtime access
|
|
*
|
|
* NOTE: with current implementation, no variables are available after
|
|
* ExitBootServices, and all are persisted (if possible).
|
|
*
|
|
* If not specified, the attributes default to "{boot}".
|
|
*
|
|
* The required type is one of:
|
|
*
|
|
* + utf8 - raw utf8 string
|
|
* + blob - arbitrary length hex string
|
|
*
|
|
* Maybe a utf16 type would be useful to for a string value to be auto
|
|
* converted to utf16?
|
|
*/
|
|
|
|
#define PREFIX_LEN (strlen("efi_xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx_"))
|
|
|
|
/**
|
|
* efi_to_native() - convert the UEFI variable name and vendor GUID to U-Boot
|
|
* variable name
|
|
*
|
|
* The U-Boot variable name is a concatenation of prefix 'efi', the hexstring
|
|
* encoded vendor GUID, and the UTF-8 encoded UEFI variable name separated by
|
|
* underscores, e.g. 'efi_8be4df61-93ca-11d2-aa0d-00e098032b8c_BootOrder'.
|
|
*
|
|
* @native: pointer to pointer to U-Boot variable name
|
|
* @variable_name: UEFI variable name
|
|
* @vendor: vendor GUID
|
|
* Return: status code
|
|
*/
|
|
static efi_status_t efi_to_native(char **native, const u16 *variable_name,
|
|
const efi_guid_t *vendor)
|
|
{
|
|
size_t len;
|
|
char *pos;
|
|
|
|
len = PREFIX_LEN + utf16_utf8_strlen(variable_name) + 1;
|
|
*native = malloc(len);
|
|
if (!*native)
|
|
return EFI_OUT_OF_RESOURCES;
|
|
|
|
pos = *native;
|
|
pos += sprintf(pos, "efi_%pUl_", vendor);
|
|
utf16_utf8_strcpy(&pos, variable_name);
|
|
|
|
return EFI_SUCCESS;
|
|
}
|
|
|
|
/**
|
|
* prefix() - skip over prefix
|
|
*
|
|
* Skip over a prefix string.
|
|
*
|
|
* @str: string with prefix
|
|
* @prefix: prefix string
|
|
* Return: string without prefix, or NULL if prefix not found
|
|
*/
|
|
static const char *prefix(const char *str, const char *prefix)
|
|
{
|
|
size_t n = strlen(prefix);
|
|
if (!strncmp(prefix, str, n))
|
|
return str + n;
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* parse_attr() - decode attributes part of variable value
|
|
*
|
|
* Convert the string encoded attributes of a UEFI variable to a bit mask.
|
|
* TODO: Several attributes are not supported.
|
|
*
|
|
* @str: value of U-Boot variable
|
|
* @attrp: pointer to UEFI attributes
|
|
* Return: pointer to remainder of U-Boot variable value
|
|
*/
|
|
static const char *parse_attr(const char *str, u32 *attrp)
|
|
{
|
|
u32 attr = 0;
|
|
char sep = '{';
|
|
|
|
if (*str != '{') {
|
|
*attrp = EFI_VARIABLE_BOOTSERVICE_ACCESS;
|
|
return str;
|
|
}
|
|
|
|
while (*str == sep) {
|
|
const char *s;
|
|
|
|
str++;
|
|
|
|
if ((s = prefix(str, "ro"))) {
|
|
attr |= READ_ONLY;
|
|
} else if ((s = prefix(str, "boot"))) {
|
|
attr |= EFI_VARIABLE_BOOTSERVICE_ACCESS;
|
|
} else if ((s = prefix(str, "run"))) {
|
|
attr |= EFI_VARIABLE_RUNTIME_ACCESS;
|
|
} else {
|
|
printf("invalid attribute: %s\n", str);
|
|
break;
|
|
}
|
|
|
|
str = s;
|
|
sep = ',';
|
|
}
|
|
|
|
str++;
|
|
|
|
*attrp = attr;
|
|
|
|
return str;
|
|
}
|
|
|
|
/**
|
|
* efi_efi_get_variable() - retrieve value of a UEFI variable
|
|
*
|
|
* This function implements the GetVariable runtime service.
|
|
*
|
|
* See the Unified Extensible Firmware Interface (UEFI) specification for
|
|
* details.
|
|
*
|
|
* @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
|
|
* Return: status code
|
|
*/
|
|
efi_status_t EFIAPI efi_get_variable(u16 *variable_name,
|
|
const efi_guid_t *vendor, u32 *attributes,
|
|
efi_uintn_t *data_size, void *data)
|
|
{
|
|
char *native_name;
|
|
efi_status_t ret;
|
|
unsigned long in_size;
|
|
const char *val, *s;
|
|
u32 attr;
|
|
|
|
EFI_ENTRY("\"%ls\" %pUl %p %p %p", variable_name, vendor, attributes,
|
|
data_size, data);
|
|
|
|
if (!variable_name || !vendor || !data_size)
|
|
return EFI_EXIT(EFI_INVALID_PARAMETER);
|
|
|
|
ret = efi_to_native(&native_name, variable_name, vendor);
|
|
if (ret)
|
|
return EFI_EXIT(ret);
|
|
|
|
EFI_PRINT("get '%s'\n", native_name);
|
|
|
|
val = env_get(native_name);
|
|
free(native_name);
|
|
if (!val)
|
|
return EFI_EXIT(EFI_NOT_FOUND);
|
|
|
|
val = parse_attr(val, &attr);
|
|
|
|
in_size = *data_size;
|
|
|
|
if ((s = prefix(val, "(blob)"))) {
|
|
size_t len = strlen(s);
|
|
|
|
/* number of hexadecimal digits must be even */
|
|
if (len & 1)
|
|
return EFI_EXIT(EFI_DEVICE_ERROR);
|
|
|
|
/* two characters per byte: */
|
|
len /= 2;
|
|
*data_size = len;
|
|
|
|
if (in_size < len)
|
|
return EFI_EXIT(EFI_BUFFER_TOO_SMALL);
|
|
|
|
if (!data)
|
|
return EFI_EXIT(EFI_INVALID_PARAMETER);
|
|
|
|
if (hex2bin(data, s, len))
|
|
return EFI_EXIT(EFI_DEVICE_ERROR);
|
|
|
|
EFI_PRINT("got value: \"%s\"\n", s);
|
|
} else if ((s = prefix(val, "(utf8)"))) {
|
|
unsigned len = strlen(s) + 1;
|
|
|
|
*data_size = len;
|
|
|
|
if (in_size < len)
|
|
return EFI_EXIT(EFI_BUFFER_TOO_SMALL);
|
|
|
|
if (!data)
|
|
return EFI_EXIT(EFI_INVALID_PARAMETER);
|
|
|
|
memcpy(data, s, len);
|
|
((char *)data)[len] = '\0';
|
|
|
|
EFI_PRINT("got value: \"%s\"\n", (char *)data);
|
|
} else {
|
|
EFI_PRINT("invalid value: '%s'\n", val);
|
|
return EFI_EXIT(EFI_DEVICE_ERROR);
|
|
}
|
|
|
|
if (attributes)
|
|
*attributes = attr & EFI_VARIABLE_MASK;
|
|
|
|
return EFI_EXIT(EFI_SUCCESS);
|
|
}
|
|
|
|
static char *efi_variables_list;
|
|
static char *efi_cur_variable;
|
|
|
|
/**
|
|
* parse_uboot_variable() - parse a u-boot variable and get uefi-related
|
|
* information
|
|
* @variable: whole data of u-boot variable (ie. name=value)
|
|
* @variable_name_size: size of variable_name buffer in byte
|
|
* @variable_name: name of uefi variable in u16, null-terminated
|
|
* @vendor: vendor's guid
|
|
* @attributes: attributes
|
|
*
|
|
* A uefi variable is encoded into a u-boot variable as described above.
|
|
* This function parses such a u-boot variable and retrieve uefi-related
|
|
* information into respective parameters. In return, variable_name_size
|
|
* is the size of variable name including NULL.
|
|
*
|
|
* Return: EFI_SUCCESS if parsing is OK, EFI_NOT_FOUND when
|
|
the entire variable list has been returned,
|
|
otherwise non-zero status code
|
|
*/
|
|
static efi_status_t parse_uboot_variable(char *variable,
|
|
efi_uintn_t *variable_name_size,
|
|
u16 *variable_name,
|
|
const efi_guid_t *vendor,
|
|
u32 *attributes)
|
|
{
|
|
char *guid, *name, *end, c;
|
|
unsigned long name_len;
|
|
u16 *p;
|
|
|
|
guid = strchr(variable, '_');
|
|
if (!guid)
|
|
return EFI_INVALID_PARAMETER;
|
|
guid++;
|
|
name = strchr(guid, '_');
|
|
if (!name)
|
|
return EFI_INVALID_PARAMETER;
|
|
name++;
|
|
end = strchr(name, '=');
|
|
if (!end)
|
|
return EFI_INVALID_PARAMETER;
|
|
|
|
name_len = end - name;
|
|
if (*variable_name_size < (name_len + 1)) {
|
|
*variable_name_size = name_len + 1;
|
|
return EFI_BUFFER_TOO_SMALL;
|
|
}
|
|
end++; /* point to value */
|
|
|
|
/* variable name */
|
|
p = variable_name;
|
|
utf8_utf16_strncpy(&p, name, name_len);
|
|
variable_name[name_len] = 0;
|
|
*variable_name_size = name_len + 1;
|
|
|
|
/* guid */
|
|
c = *(name - 1);
|
|
*(name - 1) = '\0'; /* guid need be null-terminated here */
|
|
uuid_str_to_bin(guid, (unsigned char *)vendor, UUID_STR_FORMAT_GUID);
|
|
*(name - 1) = c;
|
|
|
|
/* attributes */
|
|
parse_attr(end, attributes);
|
|
|
|
return EFI_SUCCESS;
|
|
}
|
|
|
|
/**
|
|
* efi_get_next_variable_name() - enumerate the current variable names
|
|
* @variable_name_size: size of variable_name buffer in byte
|
|
* @variable_name: name of uefi variable's name in u16
|
|
* @vendor: vendor's guid
|
|
*
|
|
* This function implements the GetNextVariableName service.
|
|
*
|
|
* See the Unified Extensible Firmware Interface (UEFI) specification for
|
|
* details: http://wiki.phoenix.com/wiki/index.php/
|
|
* EFI_RUNTIME_SERVICES#GetNextVariableName.28.29
|
|
*
|
|
* Return: status code
|
|
*/
|
|
efi_status_t EFIAPI efi_get_next_variable_name(efi_uintn_t *variable_name_size,
|
|
u16 *variable_name,
|
|
const efi_guid_t *vendor)
|
|
{
|
|
char *native_name, *variable;
|
|
ssize_t name_len, list_len;
|
|
char regex[256];
|
|
char * const regexlist[] = {regex};
|
|
u32 attributes;
|
|
int i;
|
|
efi_status_t ret;
|
|
|
|
EFI_ENTRY("%p \"%ls\" %pUl", variable_name_size, variable_name, vendor);
|
|
|
|
if (!variable_name_size || !variable_name || !vendor)
|
|
return EFI_EXIT(EFI_INVALID_PARAMETER);
|
|
|
|
if (variable_name[0]) {
|
|
/* check null-terminated string */
|
|
for (i = 0; i < *variable_name_size; i++)
|
|
if (!variable_name[i])
|
|
break;
|
|
if (i >= *variable_name_size)
|
|
return EFI_EXIT(EFI_INVALID_PARAMETER);
|
|
|
|
/* search for the last-returned variable */
|
|
ret = efi_to_native(&native_name, variable_name, vendor);
|
|
if (ret)
|
|
return EFI_EXIT(ret);
|
|
|
|
name_len = strlen(native_name);
|
|
for (variable = efi_variables_list; variable && *variable;) {
|
|
if (!strncmp(variable, native_name, name_len) &&
|
|
variable[name_len] == '=')
|
|
break;
|
|
|
|
variable = strchr(variable, '\n');
|
|
if (variable)
|
|
variable++;
|
|
}
|
|
|
|
free(native_name);
|
|
if (!(variable && *variable))
|
|
return EFI_EXIT(EFI_INVALID_PARAMETER);
|
|
|
|
/* next variable */
|
|
variable = strchr(variable, '\n');
|
|
if (variable)
|
|
variable++;
|
|
if (!(variable && *variable))
|
|
return EFI_EXIT(EFI_NOT_FOUND);
|
|
} else {
|
|
/*
|
|
*new search: free a list used in the previous search
|
|
*/
|
|
free(efi_variables_list);
|
|
efi_variables_list = NULL;
|
|
efi_cur_variable = NULL;
|
|
|
|
snprintf(regex, 256, "efi_.*-.*-.*-.*-.*_.*");
|
|
list_len = hexport_r(&env_htab, '\n',
|
|
H_MATCH_REGEX | H_MATCH_KEY,
|
|
&efi_variables_list, 0, 1, regexlist);
|
|
/* 1 indicates that no match was found */
|
|
if (list_len <= 1)
|
|
return EFI_EXIT(EFI_NOT_FOUND);
|
|
|
|
variable = efi_variables_list;
|
|
}
|
|
|
|
ret = parse_uboot_variable(variable, variable_name_size, variable_name,
|
|
vendor, &attributes);
|
|
|
|
return EFI_EXIT(ret);
|
|
}
|
|
|
|
/**
|
|
* efi_efi_set_variable() - set value of a UEFI variable
|
|
*
|
|
* This function implements the SetVariable runtime service.
|
|
*
|
|
* See the Unified Extensible Firmware Interface (UEFI) specification for
|
|
* details.
|
|
*
|
|
* @variable_name: name of the variable
|
|
* @vendor: vendor GUID
|
|
* @attributes: attributes of the variable
|
|
* @data_size: size of the buffer with the variable value
|
|
* @data: buffer with the variable value
|
|
* Return: status code
|
|
*/
|
|
efi_status_t EFIAPI efi_set_variable(u16 *variable_name,
|
|
const efi_guid_t *vendor, u32 attributes,
|
|
efi_uintn_t data_size, const void *data)
|
|
{
|
|
char *native_name = NULL, *val = NULL, *s;
|
|
efi_status_t ret = EFI_SUCCESS;
|
|
u32 attr;
|
|
|
|
EFI_ENTRY("\"%ls\" %pUl %x %zu %p", variable_name, vendor, attributes,
|
|
data_size, data);
|
|
|
|
if (!variable_name || !vendor) {
|
|
ret = EFI_INVALID_PARAMETER;
|
|
goto out;
|
|
}
|
|
|
|
ret = efi_to_native(&native_name, variable_name, vendor);
|
|
if (ret)
|
|
goto out;
|
|
|
|
#define ACCESS_ATTR (EFI_VARIABLE_RUNTIME_ACCESS | EFI_VARIABLE_BOOTSERVICE_ACCESS)
|
|
|
|
if ((data_size == 0) || !(attributes & ACCESS_ATTR)) {
|
|
/* delete the variable: */
|
|
env_set(native_name, NULL);
|
|
ret = EFI_SUCCESS;
|
|
goto out;
|
|
}
|
|
|
|
val = env_get(native_name);
|
|
if (val) {
|
|
parse_attr(val, &attr);
|
|
|
|
if (attr & READ_ONLY) {
|
|
/* We should not free val */
|
|
val = NULL;
|
|
ret = EFI_WRITE_PROTECTED;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
val = malloc(2 * data_size + strlen("{ro,run,boot}(blob)") + 1);
|
|
if (!val) {
|
|
ret = EFI_OUT_OF_RESOURCES;
|
|
goto out;
|
|
}
|
|
|
|
s = val;
|
|
|
|
/*
|
|
* store attributes
|
|
* TODO: several attributes are not supported
|
|
*/
|
|
attributes &= (EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS);
|
|
s += sprintf(s, "{");
|
|
while (attributes) {
|
|
u32 attr = 1 << (ffs(attributes) - 1);
|
|
|
|
if (attr == EFI_VARIABLE_BOOTSERVICE_ACCESS)
|
|
s += sprintf(s, "boot");
|
|
else if (attr == EFI_VARIABLE_RUNTIME_ACCESS)
|
|
s += sprintf(s, "run");
|
|
|
|
attributes &= ~attr;
|
|
if (attributes)
|
|
s += sprintf(s, ",");
|
|
}
|
|
s += sprintf(s, "}");
|
|
|
|
/* store payload: */
|
|
s += sprintf(s, "(blob)");
|
|
s = bin2hex(s, data, data_size);
|
|
*s = '\0';
|
|
|
|
EFI_PRINT("setting: %s=%s\n", native_name, val);
|
|
|
|
if (env_set(native_name, val))
|
|
ret = EFI_DEVICE_ERROR;
|
|
|
|
out:
|
|
free(native_name);
|
|
free(val);
|
|
|
|
return EFI_EXIT(ret);
|
|
}
|