Initially just supports "disk" type devices, but a real UEFI implementation would expose input/output/display/etc with device-paths as well, so we may eventually want to expand this for other uses.
Signed-off-by: Rob Clark robdclark@gmail.com --- include/efi_loader.h | 9 +++ lib/efi_loader/Makefile | 1 + lib/efi_loader/efi_devpath.c | 175 +++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 185 insertions(+) create mode 100644 lib/efi_loader/efi_devpath.c
diff --git a/include/efi_loader.h b/include/efi_loader.h index 812ec10e37..97d5e3d13d 100644 --- a/include/efi_loader.h +++ b/include/efi_loader.h @@ -145,6 +145,15 @@ extern void *efi_bounce_buffer; #define EFI_LOADER_BOUNCE_BUFFER_SIZE (64 * 1024 * 1024) #endif
+/* + * u-boot to EFI device mapping: + * + * TODO extend this for GOP and various other input/output + * devices which should also have an EFI devicepath? + */ +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); + /* Convert strings from normal C strings to uEFI strings */ static inline void ascii2unicode(u16 *unicode, const char *ascii) { diff --git a/lib/efi_loader/Makefile b/lib/efi_loader/Makefile index 9c67367df4..e191a3280b 100644 --- a/lib/efi_loader/Makefile +++ b/lib/efi_loader/Makefile @@ -22,3 +22,4 @@ obj-$(CONFIG_DM_VIDEO) += efi_gop.o obj-$(CONFIG_PARTITIONS) += efi_disk.o obj-$(CONFIG_NET) += efi_net.o obj-$(CONFIG_GENERATE_SMBIOS_TABLE) += efi_smbios.o +obj-$(CONFIG_DM) += efi_devpath.o diff --git a/lib/efi_loader/efi_devpath.c b/lib/efi_loader/efi_devpath.c new file mode 100644 index 0000000000..16b8edf899 --- /dev/null +++ b/lib/efi_loader/efi_devpath.c @@ -0,0 +1,175 @@ +/* + * EFI device path from u-boot device-model mapping + * + * (C) Copyright 2017 Rob Clark + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <blk.h> +#include <dm.h> +#include <usb.h> +#include <mmc.h> +#include <efi_loader.h> +#include <inttypes.h> +#include <part.h> +#include <malloc.h> + +/* template END node: */ +const static struct efi_device_path END = { + .type = DEVICE_PATH_TYPE_END, + .sub_type = DEVICE_PATH_SUB_TYPE_END, + .length = sizeof(END), +}; + +/* template ROOT node, a fictional ACPI PNP device: */ +const static struct efi_device_path_acpi_path ROOT = { + .dp = { + .type = DEVICE_PATH_TYPE_ACPI_DEVICE, + .sub_type = DEVICE_PATH_SUB_TYPE_ACPI_DEVICE, + .length = sizeof(ROOT), + }, + .hid = EISA_PNP_ID(0x1337), + .uid = 0, +}; + + +/* size of device-path not including END node for device and all parents + * up to the root device. + */ +static unsigned dp_size(struct udevice *dev) +{ + if (!dev || !dev->driver) + return sizeof(ROOT); + + switch (dev->driver->id) { + case UCLASS_ROOT: + case UCLASS_SIMPLE_BUS: + /* stop traversing parents at this point: */ + return sizeof(ROOT); + case UCLASS_MMC: + return dp_size(dev->parent) + sizeof(struct efi_device_path_sd_mmc_path); + case UCLASS_MASS_STORAGE: + case UCLASS_USB_HUB: + return dp_size(dev->parent) + sizeof(struct efi_device_path_usb); + default: + /* just skip over unknown classes: */ + return dp_size(dev->parent); + } +} + +static void *dp_fill(void *buf, struct udevice *dev) +{ + if (!dev || !dev->driver) + return buf; + + switch (dev->driver->id) { + case UCLASS_ROOT: + case UCLASS_SIMPLE_BUS: { + /* stop traversing parents at this point: */ + struct efi_device_path_acpi_path *adp = buf; + *adp = ROOT; + return &adp[1]; + } + case UCLASS_MMC: { + struct efi_device_path_sd_mmc_path *sddp = + dp_fill(buf, dev->parent); + struct mmc *mmc = mmc_get_mmc_dev(dev); + struct blk_desc *desc = mmc_get_blk_desc(mmc); + + sddp->dp.type = DEVICE_PATH_TYPE_MESSAGING_DEVICE; + sddp->dp.sub_type = (desc->if_type == IF_TYPE_MMC) ? + DEVICE_PATH_SUB_TYPE_MSG_MMC : + DEVICE_PATH_SUB_TYPE_MSG_SD; + sddp->dp.length = sizeof(*sddp); + sddp->slot_number = 0; // XXX ??? + + return &sddp[1]; + } + case UCLASS_MASS_STORAGE: + case UCLASS_USB_HUB: { + struct efi_device_path_usb *udp = + dp_fill(buf, dev->parent); + + udp->dp.type = DEVICE_PATH_TYPE_MESSAGING_DEVICE; + udp->dp.sub_type = DEVICE_PATH_SUB_TYPE_MSG_USB; + udp->dp.length = sizeof(*udp); + udp->parent_port_number = 0; // XXX ??? + udp->usb_interface = 0; // XXX ??? + + return &udp[1]; + } + default: + debug("unhandled device class: %s (%u)\n", + dev->name, dev->driver->id); + return dp_fill(buf, dev->parent); + } +} + +/* Construct a device-path from a device: */ +struct efi_device_path *efi_dp_from_dev(struct udevice *dev) +{ + void *buf, *start; + + start = buf = calloc(1, dp_size(dev) + sizeof(END)); + buf = dp_fill(buf, dev); + *((struct efi_device_path *)buf) = END; + + return start; +} + +/* Construct a device-path from a partition on a blk device: */ +struct efi_device_path *efi_dp_from_part(struct blk_desc *desc, int part) +{ + disk_partition_t info; + unsigned dpsize; + void *buf, *start; + + dpsize = dp_size(desc->bdev->parent) + sizeof(END); + + if (desc->part_type == PART_TYPE_ISO) { + dpsize += sizeof(struct efi_device_path_cdrom_path); + } else { + dpsize += sizeof(struct efi_device_path_hard_drive_path); + } + + start = buf = calloc(1, dpsize); + + buf = dp_fill(buf, desc->bdev->parent); + + part_get_info(desc, part, &info); + + if (desc->part_type == PART_TYPE_ISO) { + struct efi_device_path_cdrom_path *cddp = buf; + + cddp->boot_entry = part - 1; + cddp->dp.type = DEVICE_PATH_TYPE_MEDIA_DEVICE; + cddp->dp.sub_type = DEVICE_PATH_SUB_TYPE_CDROM_PATH; + cddp->dp.length = sizeof (*cddp); + cddp->partition_start = info.start; + cddp->partition_end = info.size; + + buf = &cddp[1]; + } else { + struct efi_device_path_hard_drive_path *hddp = buf; + + hddp->dp.type = DEVICE_PATH_TYPE_MEDIA_DEVICE; + hddp->dp.sub_type = DEVICE_PATH_SUB_TYPE_HARD_DRIVE_PATH; + hddp->dp.length = sizeof (*hddp); + hddp->partition_number = part - 1; + hddp->partition_start = info.start; + hddp->partition_end = info.size; + if (desc->part_type == PART_TYPE_EFI) + hddp->partmap_type = 2; + else + hddp->partmap_type = 1; + hddp->signature_type = 0; + + buf = &hddp[1]; + } + + *((struct efi_device_path *)buf) = END; + + return start; +}