Merge efilib changes from projects/uefi

r247216:

  Add the ability for a device to have an "alias" handle.

r247379:

  Fix network device registration.

r247380:

  Adjust our load device when we boot from CD under UEFI.

  The process for booting from a CD under UEFI involves adding a FAT
  filesystem containing your loader code as an El Torito boot image.
  When UEFI detects this, it provides a block IO instance that points
  at the FAT filesystem as a child of the device that represents the CD
  itself. The problem being that the CD device is flagged as a "raw
  device" while the boot image is flagged as a "logical partition".
  The existing EFI partition code only looks for logical partitions and
  so the CD filesystem was rendered invisible.

  To fix this, check the type of each block IO device. If it's found to
  be a CD, and thus an El Torito boot image, look up its parent device
  and add that instead so that the loader will then load the kernel from
  the CD filesystem.  This is done by using the handle for the boot
  filesystem as an alias.

  Something similar to this will be required for booting from other media
  as well as the loader will live in the EFI system partition, not on the
  partition containing the kernel.

r247381:

  Remove a scatalogical debug printf that crept in.

sys/boot/efi/include/efilib.h

@@ -41,7 +41,7 @@ extern struct netif_driver efinetif;
 void *efi_get_table(EFI_GUID *tbl);
 void efi_main(EFI_HANDLE image_handle, EFI_SYSTEM_TABLE *system_table);
 
-int efi_register_handles(struct devsw *, EFI_HANDLE *, int);
+int efi_register_handles(struct devsw *, EFI_HANDLE *, EFI_HANDLE *, int);
 EFI_HANDLE efi_find_handle(struct devsw *, int);
 int efi_handle_lookup(EFI_HANDLE, struct devsw **, int *);
 

sys/boot/efi/libefi/efinet.c

@@ -274,7 +274,7 @@ efinet_dev_init()
 	if (EFI_ERROR(status))
 		return (efi_status_to_errno(status));
 	nifs = sz / sizeof(EFI_HANDLE);
-	err = efi_register_handles(&efinet_dev, handles, nifs);
+	err = efi_register_handles(&efinet_dev, handles, NULL, nifs);
 	free(handles);
 	if (err != 0)
 		return (err);

sys/boot/efi/libefi/efipart.c

@@ -39,6 +39,7 @@ __FBSDID("$FreeBSD$");
 #include <efiprot.h>
 
 static EFI_GUID blkio_guid = BLOCK_IO_PROTOCOL;
+static EFI_GUID devpath_guid = DEVICE_PATH_PROTOCOL;
 
 static int efipart_init(void);
 static int efipart_strategy(void *, int, daddr_t, size_t, char *, size_t *);
@@ -62,9 +63,11 @@ static int
 efipart_init(void) 
 {
 	EFI_BLOCK_IO *blkio;
-	EFI_HANDLE *hin, *hout;
+	EFI_DEVICE_PATH *devpath, *node;
+	EFI_HANDLE *hin, *hout, *aliases, handle;
 	EFI_STATUS status;
 	UINTN sz;
+	CHAR16 *path;
 	u_int n, nin, nout;
 	int err;
 
@@ -72,7 +75,7 @@ efipart_init(void)
 	hin = NULL;
 	status = BS->LocateHandle(ByProtocol, &blkio_guid, 0, &sz, 0);
 	if (status == EFI_BUFFER_TOO_SMALL) {
-		hin = (EFI_HANDLE *)malloc(sz * 2);
+		hin = (EFI_HANDLE *)malloc(sz * 3);
 		status = BS->LocateHandle(ByProtocol, &blkio_guid, 0, &sz,
 		    hin);
 		if (EFI_ERROR(status))
@@ -84,19 +87,48 @@ efipart_init(void)
 	/* Filter handles to only include FreeBSD partitions. */
 	nin = sz / sizeof(EFI_HANDLE);
 	hout = hin + nin;
+	aliases = hout + nin;
 	nout = 0;
 
+	bzero(aliases, nin * sizeof(EFI_HANDLE));
+
 	for (n = 0; n < nin; n++) {
+		status = BS->HandleProtocol(hin[n], &devpath_guid, &devpath);
+		if (EFI_ERROR(status)) {
+			continue;
+		}
+		node = devpath;
+		while (!IsDevicePathEnd(NextDevicePathNode(node)))
+			node = NextDevicePathNode(node);
 		status = BS->HandleProtocol(hin[n], &blkio_guid, &blkio);
 		if (EFI_ERROR(status))
 			continue;
 		if (!blkio->Media->LogicalPartition)
 			continue;
-		hout[nout] = hin[n];
+
+		/*
+		 * If we come across a logical partition of subtype CDROM
+		 * it doesn't refer to the CD filesystem itself, but rather
+		 * to any usable El Torito boot image on it. In this case
+		 * we try to find the parent device and add that instead as
+		 * that will be the CD filesystem.
+		 */
+		if (DevicePathType(node) == MEDIA_DEVICE_PATH &&
+		    DevicePathSubType(node) == MEDIA_CDROM_DP) {
+			node->Type = END_DEVICE_PATH_TYPE;
+			node->SubType = END_ENTIRE_DEVICE_PATH_SUBTYPE;
+			status = BS->LocateDevicePath(&blkio_guid, &devpath,
+			    &handle);
+			if (EFI_ERROR(status))
+				continue;
+			hout[nout] = handle;
+			aliases[nout] = hin[n];
+		} else
+			hout[nout] = hin[n];
 		nout++;
 	}
 
-	err = efi_register_handles(&efipart_dev, hout, nout);
+	err = efi_register_handles(&efipart_dev, hout, aliases, nout);
 	free(hin);
 	return (err);
 }

sys/boot/efi/libefi/handles.c

@@ -32,6 +32,7 @@ __FBSDID("$FreeBSD$");
 
 struct entry {
 	EFI_HANDLE handle;
+	EFI_HANDLE alias;
 	struct devsw *dev;
 	int unit;
 };
@@ -40,7 +41,8 @@ struct entry *entry;
 int nentries;
 
 int
-efi_register_handles(struct devsw *sw, EFI_HANDLE *handles, int count)
+efi_register_handles(struct devsw *sw, EFI_HANDLE *handles,
+    EFI_HANDLE *aliases, int count)
 {
 	size_t sz;
 	int idx, unit;
@@ -51,6 +53,10 @@ efi_register_handles(struct devsw *sw, EFI_HANDLE *handles, int count)
 	entry = (entry == NULL) ? malloc(sz) : realloc(entry, sz);
 	for (unit = 0; idx < nentries; idx++, unit++) {
 		entry[idx].handle = handles[unit];
+		if (aliases != NULL)
+			entry[idx].alias = aliases[unit];
+		else
+			entry[idx].alias = NULL;
 		entry[idx].dev = sw;
 		entry[idx].unit = unit;
 	}
@@ -78,7 +84,7 @@ efi_handle_lookup(EFI_HANDLE h, struct devsw **dev, int *unit)
 	int idx;
 
 	for (idx = 0; idx < nentries; idx++) {
-		if (entry[idx].handle != h)
+		if (entry[idx].handle != h && entry[idx].alias != h)
 			continue;
 		if (dev != NULL)
 			*dev = entry[idx].dev;