efi_loader: efi variable support
Add EFI variable support, mapping to u-boot environment variables.
Variables are pretty important for setting up boot order, among other
things. If the board supports saveenv, then it will be called in
ExitBootServices() to persist variables set by the efi payload. (For
example, fallback.efi configuring BootOrder and BootXXXX load-option
variables.)
Variables are *not* currently exposed at runtime, post ExitBootServices.
On boards without a dedicated device for storage, which the loaded OS
is not trying to also use, this is rather tricky. One idea, at least
for boards that can persist RAM across reboot, is to keep a "journal"
of modified variables in RAM, and then turn halt into a reboot into
u-boot, plus store variables, plus halt. Whatever the solution, it
likely involves some per-board support.
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
Signed-off-by: Rob Clark <robdclark@gmail.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
diff --git a/lib/efi_loader/Makefile b/lib/efi_loader/Makefile
index 00919ce..301bf7b 100644
--- a/lib/efi_loader/Makefile
+++ b/lib/efi_loader/Makefile
@@ -17,7 +17,7 @@
obj-$(CONFIG_CMD_BOOTEFI_HELLO) += helloworld_efi.o
obj-y += efi_image_loader.o efi_boottime.o efi_runtime.o efi_console.o
obj-y += efi_memory.o efi_device_path_to_text.o efi_device_path.o
-obj-y += efi_file.o
+obj-y += efi_file.o efi_variable.o
obj-$(CONFIG_LCD) += efi_gop.o
obj-$(CONFIG_DM_VIDEO) += efi_gop.o
obj-$(CONFIG_PARTITIONS) += efi_disk.o
diff --git a/lib/efi_loader/efi_boottime.c b/lib/efi_loader/efi_boottime.c
index f01b805..90f0051 100644
--- a/lib/efi_loader/efi_boottime.c
+++ b/lib/efi_loader/efi_boottime.c
@@ -8,6 +8,7 @@
#include <common.h>
#include <efi_loader.h>
+#include <environment.h>
#include <malloc.h>
#include <asm/global_data.h>
#include <libfdt_env.h>
@@ -1013,6 +1014,11 @@
/* Make sure that notification functions are not called anymore */
efi_tpl = TPL_HIGH_LEVEL;
+#if defined(CONFIG_CMD_SAVEENV) && !defined(CONFIG_ENV_IS_NOWHERE)
+ /* save any EFI variables that have been written: */
+ env_save();
+#endif
+
board_quiesce_devices();
/* Fix up caches for EFI payloads if necessary */
diff --git a/lib/efi_loader/efi_runtime.c b/lib/efi_loader/efi_runtime.c
index 47b0376..8104e08 100644
--- a/lib/efi_loader/efi_runtime.c
+++ b/lib/efi_loader/efi_runtime.c
@@ -184,7 +184,16 @@
/* Clean up system table */
.ptr = &systab.boottime,
.patchto = NULL,
- },
+ }, {
+ .ptr = &efi_runtime_services.get_variable,
+ .patchto = &efi_device_error,
+ }, {
+ .ptr = &efi_runtime_services.get_next_variable,
+ .patchto = &efi_device_error,
+ }, {
+ .ptr = &efi_runtime_services.set_variable,
+ .patchto = &efi_device_error,
+ }
};
static bool efi_runtime_tobedetached(void *p)
@@ -384,9 +393,9 @@
.set_wakeup_time = (void *)&efi_unimplemented,
.set_virtual_address_map = &efi_set_virtual_address_map,
.convert_pointer = (void *)&efi_invalid_parameter,
- .get_variable = (void *)&efi_device_error,
- .get_next_variable = (void *)&efi_device_error,
- .set_variable = (void *)&efi_device_error,
+ .get_variable = efi_get_variable,
+ .get_next_variable = efi_get_next_variable,
+ .set_variable = efi_set_variable,
.get_next_high_mono_count = (void *)&efi_device_error,
.reset_system = &efi_reset_system_boottime,
};
diff --git a/lib/efi_loader/efi_variable.c b/lib/efi_loader/efi_variable.c
new file mode 100644
index 0000000..5569b3d
--- /dev/null
+++ b/lib/efi_loader/efi_variable.c
@@ -0,0 +1,335 @@
+/*
+ * EFI utils
+ *
+ * Copyright (c) 2017 Rob Clark
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <malloc.h>
+#include <charset.h>
+#include <efi_loader.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 MAX_VAR_NAME 31
+#define MAX_NATIVE_VAR_NAME \
+ (strlen("efi_xxxxxxxx-xxxx-xxxx-xxxxxxxxxxxxxxxx_") + \
+ (MAX_VAR_NAME * MAX_UTF8_PER_UTF16))
+
+static int hex(unsigned char ch)
+{
+ if (ch >= 'a' && ch <= 'f')
+ return ch-'a'+10;
+ if (ch >= '0' && ch <= '9')
+ return ch-'0';
+ if (ch >= 'A' && ch <= 'F')
+ return ch-'A'+10;
+ return -1;
+}
+
+static const char *hex2mem(u8 *mem, const char *hexstr, int count)
+{
+ memset(mem, 0, count/2);
+
+ do {
+ int nibble;
+
+ *mem = 0;
+
+ if (!count || !*hexstr)
+ break;
+
+ nibble = hex(*hexstr);
+ if (nibble < 0)
+ break;
+
+ *mem = nibble;
+ count--;
+ hexstr++;
+
+ if (!count || !*hexstr)
+ break;
+
+ nibble = hex(*hexstr);
+ if (nibble < 0)
+ break;
+
+ *mem = (*mem << 4) | nibble;
+ count--;
+ hexstr++;
+ mem++;
+
+ } while (1);
+
+ if (*hexstr)
+ return hexstr;
+
+ return NULL;
+}
+
+static char *mem2hex(char *hexstr, const u8 *mem, int count)
+{
+ static const char hexchars[] = "0123456789abcdef";
+
+ while (count-- > 0) {
+ u8 ch = *mem++;
+ *hexstr++ = hexchars[ch >> 4];
+ *hexstr++ = hexchars[ch & 0xf];
+ }
+
+ return hexstr;
+}
+
+static efi_status_t efi_to_native(char *native, s16 *variable_name,
+ efi_guid_t *vendor)
+{
+ size_t len;
+
+ len = utf16_strlen((u16 *)variable_name);
+ if (len >= MAX_VAR_NAME)
+ return EFI_DEVICE_ERROR;
+
+ native += sprintf(native, "efi_%pUl_", vendor);
+ native = (char *)utf16_to_utf8((u8 *)native, (u16 *)variable_name, len);
+ *native = '\0';
+
+ return EFI_SUCCESS;
+}
+
+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 attributes part of variable value, if present: */
+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;
+}
+
+/* http://wiki.phoenix.com/wiki/index.php/EFI_RUNTIME_SERVICES#GetVariable.28.29 */
+efi_status_t EFIAPI efi_get_variable(s16 *variable_name,
+ efi_guid_t *vendor, u32 *attributes,
+ unsigned long *data_size, void *data)
+{
+ char native_name[MAX_NATIVE_VAR_NAME + 1];
+ efi_status_t ret;
+ unsigned long in_size;
+ const char *val, *s;
+ u32 attr;
+
+ EFI_ENTRY("%p %p %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);
+
+ debug("%s: get '%s'\n", __func__, native_name);
+
+ val = env_get(native_name);
+ if (!val)
+ return EFI_EXIT(EFI_NOT_FOUND);
+
+ val = parse_attr(val, &attr);
+
+ in_size = *data_size;
+
+ if ((s = prefix(val, "(blob)"))) {
+ unsigned len = strlen(s);
+
+ /* two characters per byte: */
+ len = DIV_ROUND_UP(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 (hex2mem(data, s, len * 2))
+ return EFI_EXIT(EFI_DEVICE_ERROR);
+
+ debug("%s: got value: \"%s\"\n", __func__, 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';
+
+ debug("%s: got value: \"%s\"\n", __func__, (char *)data);
+ } else {
+ debug("%s: invalid value: '%s'\n", __func__, val);
+ return EFI_EXIT(EFI_DEVICE_ERROR);
+ }
+
+ if (attributes)
+ *attributes = attr & EFI_VARIABLE_MASK;
+
+ return EFI_EXIT(EFI_SUCCESS);
+}
+
+/* http://wiki.phoenix.com/wiki/index.php/EFI_RUNTIME_SERVICES#GetNextVariableName.28.29 */
+efi_status_t EFIAPI efi_get_next_variable(
+ unsigned long *variable_name_size,
+ s16 *variable_name, efi_guid_t *vendor)
+{
+ EFI_ENTRY("%p %p %p", variable_name_size, variable_name, vendor);
+
+ return EFI_EXIT(EFI_DEVICE_ERROR);
+}
+
+/* http://wiki.phoenix.com/wiki/index.php/EFI_RUNTIME_SERVICES#SetVariable.28.29 */
+efi_status_t EFIAPI efi_set_variable(s16 *variable_name,
+ efi_guid_t *vendor, u32 attributes,
+ unsigned long data_size, void *data)
+{
+ char native_name[MAX_NATIVE_VAR_NAME + 1];
+ efi_status_t ret = EFI_SUCCESS;
+ char *val, *s;
+ u32 attr;
+
+ EFI_ENTRY("%p %p %x %lu %p", variable_name, vendor, attributes,
+ data_size, data);
+
+ if (!variable_name || !vendor)
+ return EFI_EXIT(EFI_INVALID_PARAMETER);
+
+ ret = efi_to_native(native_name, variable_name, vendor);
+ if (ret)
+ return EFI_EXIT(ret);
+
+#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);
+ return EFI_EXIT(EFI_SUCCESS);
+ }
+
+ val = env_get(native_name);
+ if (val) {
+ parse_attr(val, &attr);
+
+ if (attr & READ_ONLY)
+ return EFI_EXIT(EFI_WRITE_PROTECTED);
+ }
+
+ val = malloc(2 * data_size + strlen("{ro,run,boot}(blob)") + 1);
+ if (!val)
+ return EFI_EXIT(EFI_OUT_OF_RESOURCES);
+
+ s = val;
+
+ /* store attributes: */
+ 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 = mem2hex(s, data, data_size);
+ *s = '\0';
+
+ debug("%s: setting: %s=%s\n", __func__, native_name, val);
+
+ if (env_set(native_name, val))
+ ret = EFI_DEVICE_ERROR;
+
+ free(val);
+
+ return EFI_EXIT(ret);
+}