The missing services of the EFI_DEVICE_PATH_UTILITIES_PROTOCOL are
implemented.
Signed-off-by: Heinrich Schuchardt <xypron.g...@gmx.de>
---
include/efi_api.h | 1 +
include/efi_loader.h | 9 +++
lib/efi_loader/efi_device_path.c | 64 ++++++++++++++++
lib/efi_loader/efi_device_path_utilities.c | 116 ++++++++++++++++++++++++++---
4 files changed, 180 insertions(+), 10 deletions(-)
diff --git a/include/efi_api.h b/include/efi_api.h
index ae93061160..64c27e494b 100644
--- a/include/efi_api.h
+++ b/include/efi_api.h
@@ -343,6 +343,7 @@ struct efi_loaded_image {
0x8e, 0x39, 0x00, 0xa0, 0xc9, 0x69, 0x72, 0x3b )
#define DEVICE_PATH_TYPE_END 0x7f
+# define DEVICE_PATH_SUB_TYPE_INSTANCE_END 0x01
# define DEVICE_PATH_SUB_TYPE_END 0xff
struct efi_device_path {
diff --git a/include/efi_loader.h b/include/efi_loader.h
index 1298b5e160..8d21ba74b1 100644
--- a/include/efi_loader.h
+++ b/include/efi_loader.h
@@ -337,6 +337,15 @@ struct efi_device_path *efi_dp_append_node(const struct
efi_device_path *dp,
struct efi_device_path *efi_dp_create_device_node(const u8 type,
const u8 sub_type,
const u16 length);
+/* Append device path instance */
+struct efi_device_path *efi_dp_append_instance(
+ const struct efi_device_path *dp,
+ const struct efi_device_path *dpi);
+/* Get next device path instance */
+struct efi_device_path *efi_dp_get_next_instance(struct efi_device_path **dp,
+ efi_uintn_t *size);
+/* Check if a device path contains muliple instances */
+bool efi_dp_is_multi_instance(const struct efi_device_path *dp);
struct efi_device_path *efi_dp_from_dev(struct udevice *dev);
struct efi_device_path *efi_dp_from_part(struct blk_desc *desc, int part);
diff --git a/lib/efi_loader/efi_device_path.c b/lib/efi_loader/efi_device_path.c
index 09c3ec4273..2861982883 100644
--- a/lib/efi_loader/efi_device_path.c
+++ b/lib/efi_loader/efi_device_path.c
@@ -351,6 +351,70 @@ struct efi_device_path *efi_dp_create_device_node(const u8
type,
return ret;
}
+struct efi_device_path *efi_dp_append_instance(
+ const struct efi_device_path *dp,
+ const struct efi_device_path *dpi)
+{
+ size_t sz, szi;
+ struct efi_device_path *p, *ret;
+
+ if (!dpi)
+ return NULL;
+ if (!dp)
+ return efi_dp_dup(dpi);
+ sz = efi_dp_size(dp);
+ szi = efi_dp_instance_size(dpi);
+ p = dp_alloc(sz + szi + 2 * sizeof(END));
+ if (!p)
+ return NULL;
+ ret = p;
+ memcpy(p, dp, sz + sizeof(END));
+ p = (void *)p + sz;
+ p->sub_type = DEVICE_PATH_SUB_TYPE_INSTANCE_END;
+ p = (void *)p + sizeof(END);
+ memcpy(p, dpi, szi);
+ p = (void *)p + szi;
+ memcpy(p, &END, sizeof(END));
+ return ret;
+}
+
+struct efi_device_path *efi_dp_get_next_instance(struct efi_device_path **dp,
+ efi_uintn_t *size)
+{
+ size_t sz;
+ struct efi_device_path *p;
+
+ if (size)
+ *size = 0;
+ if (!dp || !*dp)
+ return NULL;
+ p = *dp;
+ sz = efi_dp_instance_size(*dp);
+ p = dp_alloc(sz + sizeof(END));
+ if (!p)
+ return NULL;
+ memcpy(p, *dp, sz + sizeof(END));
+ *dp = (void *)*dp + sz;
+ if ((*dp)->sub_type == DEVICE_PATH_SUB_TYPE_INSTANCE_END)
+ *dp = (void *)*dp + sizeof(END);
+ else
+ *dp = NULL;
+ if (size)
+ *size = sz + sizeof(END);
+ return p;
+}
+
+bool efi_dp_is_multi_instance(const struct efi_device_path *dp)
+{
+ const struct efi_device_path *p = dp;
+
+ if (!p)
+ return false;
+ while (p->type != DEVICE_PATH_TYPE_END)
+ p = (void *)p + p->length;
+ return p->sub_type == DEVICE_PATH_SUB_TYPE_INSTANCE_END;
+}
+
#ifdef CONFIG_DM
/* size of device-path not including END node for device and all parents
* up to the root device.
diff --git a/lib/efi_loader/efi_device_path_utilities.c
b/lib/efi_loader/efi_device_path_utilities.c
index e73188b242..0ada2111db 100644
--- a/lib/efi_loader/efi_device_path_utilities.c
+++ b/lib/efi_loader/efi_device_path_utilities.c
@@ -12,62 +12,158 @@
const efi_guid_t efi_guid_device_path_utilities_protocol =
EFI_DEVICE_PATH_UTILITIES_PROTOCOL_GUID;
+/*
+ * Get size of a device path.
+ *
+ * This function implements the GetDevicePathSize service of the device path
+ * utilities protocol. The device path length includes the end of path tag
+ * which may be an instance end.
+ *
+ * See the Unified Extensible Firmware Interface (UEFI) specification
+ * for details.
+ *
+ * @device_path device path
+ * @return size in bytes
+ */
static efi_uintn_t EFIAPI get_device_path_size(
const struct efi_device_path *device_path)
{
efi_uintn_t sz = 0;
- EFI_ENTRY("%p", device_path);
+ EFI_ENTRY("%pD", device_path);
/* size includes the END node: */
if (device_path)
sz = efi_dp_size(device_path) + sizeof(struct efi_device_path);
return EFI_EXIT(sz);
}
+/*
+ * Duplicate a device path.
+ *
+ * This function implements the DuplicateDevicePath service of the device path
+ * utilities protocol.
+ *
+ * The UEFI spec does not indicate what happens to the end tag. We follow the
+ * EDK2 logic: In case the device path ends with an end of instance tag, the
+ * copy will also end with an end of instance tag.
+ *
+ * See the Unified Extensible Firmware Interface (UEFI) specification
+ * for details.
+ *
+ * @device_path device path
+ * @return copy of the device path
+ */
static struct efi_device_path * EFIAPI duplicate_device_path(
const struct efi_device_path *device_path)
{
- EFI_ENTRY("%p", device_path);
+ EFI_ENTRY("%pD", device_path);
return EFI_EXIT(efi_dp_dup(device_path));
}
+/*
+ * Append device path.
+ *
+ * This function implements the AppendDevicePath service of the device path
+ * utilities protocol.
+ *
+ * See the Unified Extensible Firmware Interface (UEFI) specification
+ * for details.
+ *
+ * @src1 1st device path
+ * @src2 2nd device path
+ * @return concatenated device path
+ */
static struct efi_device_path * EFIAPI append_device_path(
const struct efi_device_path *src1,
const struct efi_device_path *src2)
{
- EFI_ENTRY("%p, %p", src1, src2);
+ EFI_ENTRY("%pD, %pD", src1, src2);
return EFI_EXIT(efi_dp_append(src1, src2));
}
+/*
+ * Append device path node.
+ *
+ * This function implements the AppendDeviceNode service of the device path
+ * utilities protocol.
+ *
+ * See the Unified Extensible Firmware Interface (UEFI) specification
+ * for details.
+ *
+ * @device_path device path
+ * @device_node device node
+ * @return concatenated device path
+ */
static struct efi_device_path * EFIAPI append_device_node(
const struct efi_device_path *device_path,
const struct efi_device_path *device_node)
{
- EFI_ENTRY("%p, %p", device_path, device_node);
+ EFI_ENTRY("%pD, %p", device_path, device_node);
return EFI_EXIT(efi_dp_append_node(device_path, device_node));
}
+/*
+ * Append device path instance.
+ *
+ * This function implements the AppendDevicePathInstance service of the device
+ * path utilities protocol.
+ *
+ * See the Unified Extensible Firmware Interface (UEFI) specification
+ * for details.
+ *
+ * @device_path 1st device path
+ * @device_path_instance 2nd device path
+ * @return concatenated device path
+ */
static struct efi_device_path * EFIAPI append_device_path_instance(
const struct efi_device_path *device_path,
const struct efi_device_path *device_path_instance)
{
- EFI_ENTRY("%p, %p", device_path, device_path_instance);
- return EFI_EXIT(NULL);
+ EFI_ENTRY("%pD, %pD", device_path, device_path_instance);
+ return EFI_EXIT(efi_dp_append_instance(device_path,
+ device_path_instance));
}
+/*
+ * Get next device path instance.
+ *
+ * This function implements the GetNextDevicePathInstance service of the device
+ * path utilities protocol.
+ *
+ * See the Unified Extensible Firmware Interface (UEFI) specification
+ * for details.
+ *
+ * @device_path_instance next device path instance
+ * @device_path_instance_size size of the device path instance
+ * @return concatenated device path
+ */
static struct efi_device_path * EFIAPI get_next_device_path_instance(
struct efi_device_path **device_path_instance,
efi_uintn_t *device_path_instance_size)
{
- EFI_ENTRY("%p, %p", device_path_instance, device_path_instance_size);
- return EFI_EXIT(NULL);
+ EFI_ENTRY("%pD, %p", device_path_instance, device_path_instance_size);
+ return EFI_EXIT(efi_dp_get_next_instance(device_path_instance,
+ device_path_instance_size));
}
+/*
+ * Check if a device path contains more than one instance.
+ *
+ * This function implements the AppendDeviceNode service of the device path
+ * utilities protocol.
+ *
+ * See the Unified Extensible Firmware Interface (UEFI) specification
+ * for details.
+ *
+ * @device_path device path
+ * @device_node device node
+ * @return concatenated device path
+ */
static bool EFIAPI is_device_path_multi_instance(
const struct efi_device_path *device_path)
{
- EFI_ENTRY("%p", device_path);
- return EFI_EXIT(false);
+ EFI_ENTRY("%pD", device_path);
+ return EFI_EXIT(efi_dp_is_multi_instance(device_path));
}
/*
--
2.14.2
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