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- // SPDX-License-Identifier: GPL-2.0+
- /*
- * EFI device path from u-boot device-model mapping
- *
- * (C) Copyright 2017 Rob Clark
- */
- #include <common.h>
- #include <blk.h>
- #include <dm.h>
- #include <usb.h>
- #include <mmc.h>
- #include <nvme.h>
- #include <efi_loader.h>
- #include <part.h>
- #include <sandboxblockdev.h>
- #include <asm-generic/unaligned.h>
- #include <linux/compat.h> /* U16_MAX */
- #ifdef CONFIG_SANDBOX
- const efi_guid_t efi_guid_host_dev = U_BOOT_HOST_DEV_GUID;
- #endif
- /* template END node: */
- static const struct efi_device_path END = {
- .type = DEVICE_PATH_TYPE_END,
- .sub_type = DEVICE_PATH_SUB_TYPE_END,
- .length = sizeof(END),
- };
- /* template ROOT node: */
- static const struct efi_device_path_vendor ROOT = {
- .dp = {
- .type = DEVICE_PATH_TYPE_HARDWARE_DEVICE,
- .sub_type = DEVICE_PATH_SUB_TYPE_VENDOR,
- .length = sizeof(ROOT),
- },
- .guid = U_BOOT_GUID,
- };
- #if defined(CONFIG_DM_MMC) && defined(CONFIG_MMC)
- /*
- * Determine if an MMC device is an SD card.
- *
- * @desc block device descriptor
- * @return true if the device is an SD card
- */
- static bool is_sd(struct blk_desc *desc)
- {
- struct mmc *mmc = find_mmc_device(desc->devnum);
- if (!mmc)
- return false;
- return IS_SD(mmc) != 0U;
- }
- #endif
- static void *dp_alloc(size_t sz)
- {
- void *buf;
- if (efi_allocate_pool(EFI_ALLOCATE_ANY_PAGES, sz, &buf) !=
- EFI_SUCCESS) {
- debug("EFI: ERROR: out of memory in %s\n", __func__);
- return NULL;
- }
- memset(buf, 0, sz);
- return buf;
- }
- /*
- * Iterate to next block in device-path, terminating (returning NULL)
- * at /End* node.
- */
- struct efi_device_path *efi_dp_next(const struct efi_device_path *dp)
- {
- if (dp == NULL)
- return NULL;
- if (dp->type == DEVICE_PATH_TYPE_END)
- return NULL;
- dp = ((void *)dp) + dp->length;
- if (dp->type == DEVICE_PATH_TYPE_END)
- return NULL;
- return (struct efi_device_path *)dp;
- }
- /*
- * Compare two device-paths, stopping when the shorter of the two hits
- * an End* node. This is useful to, for example, compare a device-path
- * representing a device with one representing a file on the device, or
- * a device with a parent device.
- */
- int efi_dp_match(const struct efi_device_path *a,
- const struct efi_device_path *b)
- {
- while (1) {
- int ret;
- ret = memcmp(&a->length, &b->length, sizeof(a->length));
- if (ret)
- return ret;
- ret = memcmp(a, b, a->length);
- if (ret)
- return ret;
- a = efi_dp_next(a);
- b = efi_dp_next(b);
- if (!a || !b)
- return 0;
- }
- }
- /*
- * We can have device paths that start with a USB WWID or a USB Class node,
- * and a few other cases which don't encode the full device path with bus
- * hierarchy:
- *
- * - MESSAGING:USB_WWID
- * - MESSAGING:USB_CLASS
- * - MEDIA:FILE_PATH
- * - MEDIA:HARD_DRIVE
- * - MESSAGING:URI
- *
- * See UEFI spec (section 3.1.2, about short-form device-paths)
- */
- static struct efi_device_path *shorten_path(struct efi_device_path *dp)
- {
- while (dp) {
- /*
- * TODO: Add MESSAGING:USB_WWID and MESSAGING:URI..
- * in practice fallback.efi just uses MEDIA:HARD_DRIVE
- * so not sure when we would see these other cases.
- */
- if (EFI_DP_TYPE(dp, MESSAGING_DEVICE, MSG_USB_CLASS) ||
- EFI_DP_TYPE(dp, MEDIA_DEVICE, HARD_DRIVE_PATH) ||
- EFI_DP_TYPE(dp, MEDIA_DEVICE, FILE_PATH))
- return dp;
- dp = efi_dp_next(dp);
- }
- return dp;
- }
- static struct efi_object *find_obj(struct efi_device_path *dp, bool short_path,
- struct efi_device_path **rem)
- {
- struct efi_object *efiobj;
- efi_uintn_t dp_size = efi_dp_instance_size(dp);
- list_for_each_entry(efiobj, &efi_obj_list, link) {
- struct efi_handler *handler;
- struct efi_device_path *obj_dp;
- efi_status_t ret;
- ret = efi_search_protocol(efiobj,
- &efi_guid_device_path, &handler);
- if (ret != EFI_SUCCESS)
- continue;
- obj_dp = handler->protocol_interface;
- do {
- if (efi_dp_match(dp, obj_dp) == 0) {
- if (rem) {
- /*
- * Allow partial matches, but inform
- * the caller.
- */
- *rem = ((void *)dp) +
- efi_dp_instance_size(obj_dp);
- return efiobj;
- } else {
- /* Only return on exact matches */
- if (efi_dp_instance_size(obj_dp) ==
- dp_size)
- return efiobj;
- }
- }
- obj_dp = shorten_path(efi_dp_next(obj_dp));
- } while (short_path && obj_dp);
- }
- return NULL;
- }
- /*
- * Find an efiobj from device-path, if 'rem' is not NULL, returns the
- * remaining part of the device path after the matched object.
- */
- struct efi_object *efi_dp_find_obj(struct efi_device_path *dp,
- struct efi_device_path **rem)
- {
- struct efi_object *efiobj;
- /* Search for an exact match first */
- efiobj = find_obj(dp, false, NULL);
- /* Then for a fuzzy match */
- if (!efiobj)
- efiobj = find_obj(dp, false, rem);
- /* And now for a fuzzy short match */
- if (!efiobj)
- efiobj = find_obj(dp, true, rem);
- return efiobj;
- }
- /*
- * Determine the last device path node that is not the end node.
- *
- * @dp device path
- * @return last node before the end node if it exists
- * otherwise NULL
- */
- const struct efi_device_path *efi_dp_last_node(const struct efi_device_path *dp)
- {
- struct efi_device_path *ret;
- if (!dp || dp->type == DEVICE_PATH_TYPE_END)
- return NULL;
- while (dp) {
- ret = (struct efi_device_path *)dp;
- dp = efi_dp_next(dp);
- }
- return ret;
- }
- /* get size of the first device path instance excluding end node */
- efi_uintn_t efi_dp_instance_size(const struct efi_device_path *dp)
- {
- efi_uintn_t sz = 0;
- if (!dp || dp->type == DEVICE_PATH_TYPE_END)
- return 0;
- while (dp) {
- sz += dp->length;
- dp = efi_dp_next(dp);
- }
- return sz;
- }
- /* get size of multi-instance device path excluding end node */
- efi_uintn_t efi_dp_size(const struct efi_device_path *dp)
- {
- const struct efi_device_path *p = dp;
- if (!p)
- return 0;
- while (p->type != DEVICE_PATH_TYPE_END ||
- p->sub_type != DEVICE_PATH_SUB_TYPE_END)
- p = (void *)p + p->length;
- return (void *)p - (void *)dp;
- }
- /* copy multi-instance device path */
- struct efi_device_path *efi_dp_dup(const struct efi_device_path *dp)
- {
- struct efi_device_path *ndp;
- size_t sz = efi_dp_size(dp) + sizeof(END);
- if (!dp)
- return NULL;
- ndp = dp_alloc(sz);
- if (!ndp)
- return NULL;
- memcpy(ndp, dp, sz);
- return ndp;
- }
- struct efi_device_path *efi_dp_append(const struct efi_device_path *dp1,
- const struct efi_device_path *dp2)
- {
- struct efi_device_path *ret;
- if (!dp1 && !dp2) {
- /* return an end node */
- ret = efi_dp_dup(&END);
- } else if (!dp1) {
- ret = efi_dp_dup(dp2);
- } else if (!dp2) {
- ret = efi_dp_dup(dp1);
- } else {
- /* both dp1 and dp2 are non-null */
- unsigned sz1 = efi_dp_size(dp1);
- unsigned sz2 = efi_dp_size(dp2);
- void *p = dp_alloc(sz1 + sz2 + sizeof(END));
- if (!p)
- return NULL;
- memcpy(p, dp1, sz1);
- /* the end node of the second device path has to be retained */
- memcpy(p + sz1, dp2, sz2 + sizeof(END));
- ret = p;
- }
- return ret;
- }
- struct efi_device_path *efi_dp_append_node(const struct efi_device_path *dp,
- const struct efi_device_path *node)
- {
- struct efi_device_path *ret;
- if (!node && !dp) {
- ret = efi_dp_dup(&END);
- } else if (!node) {
- ret = efi_dp_dup(dp);
- } else if (!dp) {
- size_t sz = node->length;
- void *p = dp_alloc(sz + sizeof(END));
- if (!p)
- return NULL;
- memcpy(p, node, sz);
- memcpy(p + sz, &END, sizeof(END));
- ret = p;
- } else {
- /* both dp and node are non-null */
- size_t sz = efi_dp_size(dp);
- void *p = dp_alloc(sz + node->length + sizeof(END));
- if (!p)
- return NULL;
- memcpy(p, dp, sz);
- memcpy(p + sz, node, node->length);
- memcpy(p + sz + node->length, &END, sizeof(END));
- ret = p;
- }
- return ret;
- }
- struct efi_device_path *efi_dp_create_device_node(const u8 type,
- const u8 sub_type,
- const u16 length)
- {
- struct efi_device_path *ret;
- if (length < sizeof(struct efi_device_path))
- return NULL;
- ret = dp_alloc(length);
- if (!ret)
- return ret;
- ret->type = type;
- ret->sub_type = sub_type;
- ret->length = length;
- 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;
- 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.
- */
- __maybe_unused static unsigned int 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_ETH:
- return dp_size(dev->parent) +
- sizeof(struct efi_device_path_mac_addr);
- #ifdef CONFIG_BLK
- case UCLASS_BLK:
- switch (dev->parent->uclass->uc_drv->id) {
- #ifdef CONFIG_IDE
- case UCLASS_IDE:
- return dp_size(dev->parent) +
- sizeof(struct efi_device_path_atapi);
- #endif
- #if defined(CONFIG_SCSI) && defined(CONFIG_DM_SCSI)
- case UCLASS_SCSI:
- return dp_size(dev->parent) +
- sizeof(struct efi_device_path_scsi);
- #endif
- #if defined(CONFIG_DM_MMC) && defined(CONFIG_MMC)
- case UCLASS_MMC:
- return dp_size(dev->parent) +
- sizeof(struct efi_device_path_sd_mmc_path);
- #endif
- #if defined(CONFIG_NVME)
- case UCLASS_NVME:
- return dp_size(dev->parent) +
- sizeof(struct efi_device_path_nvme);
- #endif
- #ifdef CONFIG_SANDBOX
- case UCLASS_ROOT:
- /*
- * Sandbox's host device will be represented
- * as vendor device with extra one byte for
- * device number
- */
- return dp_size(dev->parent)
- + sizeof(struct efi_device_path_vendor) + 1;
- #endif
- default:
- return dp_size(dev->parent);
- }
- #endif
- #if defined(CONFIG_DM_MMC) && defined(CONFIG_MMC)
- case UCLASS_MMC:
- return dp_size(dev->parent) +
- sizeof(struct efi_device_path_sd_mmc_path);
- #endif
- case UCLASS_MASS_STORAGE:
- case UCLASS_USB_HUB:
- return dp_size(dev->parent) +
- sizeof(struct efi_device_path_usb_class);
- default:
- /* just skip over unknown classes: */
- return dp_size(dev->parent);
- }
- }
- /*
- * Recursively build a device path.
- *
- * @buf pointer to the end of the device path
- * @dev device
- * @return pointer to the end of the device path
- */
- __maybe_unused 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_vendor *vdp = buf;
- *vdp = ROOT;
- return &vdp[1];
- }
- #ifdef CONFIG_DM_ETH
- case UCLASS_ETH: {
- struct efi_device_path_mac_addr *dp =
- dp_fill(buf, dev->parent);
- struct eth_pdata *pdata = dev->platdata;
- dp->dp.type = DEVICE_PATH_TYPE_MESSAGING_DEVICE;
- dp->dp.sub_type = DEVICE_PATH_SUB_TYPE_MSG_MAC_ADDR;
- dp->dp.length = sizeof(*dp);
- memset(&dp->mac, 0, sizeof(dp->mac));
- /* We only support IPv4 */
- memcpy(&dp->mac, &pdata->enetaddr, ARP_HLEN);
- /* Ethernet */
- dp->if_type = 1;
- return &dp[1];
- }
- #endif
- #ifdef CONFIG_BLK
- case UCLASS_BLK:
- switch (dev->parent->uclass->uc_drv->id) {
- #ifdef CONFIG_SANDBOX
- case UCLASS_ROOT: {
- /* stop traversing parents at this point: */
- struct efi_device_path_vendor *dp = buf;
- struct blk_desc *desc = dev_get_uclass_platdata(dev);
- dp_fill(buf, dev->parent);
- dp = buf;
- ++dp;
- dp->dp.type = DEVICE_PATH_TYPE_HARDWARE_DEVICE;
- dp->dp.sub_type = DEVICE_PATH_SUB_TYPE_VENDOR;
- dp->dp.length = sizeof(*dp) + 1;
- memcpy(&dp->guid, &efi_guid_host_dev,
- sizeof(efi_guid_t));
- dp->vendor_data[0] = desc->devnum;
- return &dp->vendor_data[1];
- }
- #endif
- #ifdef CONFIG_IDE
- case UCLASS_IDE: {
- struct efi_device_path_atapi *dp =
- dp_fill(buf, dev->parent);
- struct blk_desc *desc = dev_get_uclass_platdata(dev);
- dp->dp.type = DEVICE_PATH_TYPE_MESSAGING_DEVICE;
- dp->dp.sub_type = DEVICE_PATH_SUB_TYPE_MSG_ATAPI;
- dp->dp.length = sizeof(*dp);
- dp->logical_unit_number = desc->devnum;
- dp->primary_secondary = IDE_BUS(desc->devnum);
- dp->slave_master = desc->devnum %
- (CONFIG_SYS_IDE_MAXDEVICE /
- CONFIG_SYS_IDE_MAXBUS);
- return &dp[1];
- }
- #endif
- #if defined(CONFIG_SCSI) && defined(CONFIG_DM_SCSI)
- case UCLASS_SCSI: {
- struct efi_device_path_scsi *dp =
- dp_fill(buf, dev->parent);
- struct blk_desc *desc = dev_get_uclass_platdata(dev);
- dp->dp.type = DEVICE_PATH_TYPE_MESSAGING_DEVICE;
- dp->dp.sub_type = DEVICE_PATH_SUB_TYPE_MSG_SCSI;
- dp->dp.length = sizeof(*dp);
- dp->logical_unit_number = desc->lun;
- dp->target_id = desc->target;
- return &dp[1];
- }
- #endif
- #if defined(CONFIG_DM_MMC) && defined(CONFIG_MMC)
- case UCLASS_MMC: {
- struct efi_device_path_sd_mmc_path *sddp =
- dp_fill(buf, dev->parent);
- struct blk_desc *desc = dev_get_uclass_platdata(dev);
- sddp->dp.type = DEVICE_PATH_TYPE_MESSAGING_DEVICE;
- sddp->dp.sub_type = is_sd(desc) ?
- DEVICE_PATH_SUB_TYPE_MSG_SD :
- DEVICE_PATH_SUB_TYPE_MSG_MMC;
- sddp->dp.length = sizeof(*sddp);
- sddp->slot_number = dev->seq;
- return &sddp[1];
- }
- #endif
- #if defined(CONFIG_NVME)
- case UCLASS_NVME: {
- struct efi_device_path_nvme *dp =
- dp_fill(buf, dev->parent);
- u32 ns_id;
- dp->dp.type = DEVICE_PATH_TYPE_MESSAGING_DEVICE;
- dp->dp.sub_type = DEVICE_PATH_SUB_TYPE_MSG_NVME;
- dp->dp.length = sizeof(*dp);
- nvme_get_namespace_id(dev, &ns_id, dp->eui64);
- memcpy(&dp->ns_id, &ns_id, sizeof(ns_id));
- return &dp[1];
- }
- #endif
- default:
- debug("%s(%u) %s: unhandled parent class: %s (%u)\n",
- __FILE__, __LINE__, __func__,
- dev->name, dev->parent->uclass->uc_drv->id);
- return dp_fill(buf, dev->parent);
- }
- #endif
- #if defined(CONFIG_DM_MMC) && defined(CONFIG_MMC)
- 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 = is_sd(desc) ?
- DEVICE_PATH_SUB_TYPE_MSG_SD :
- DEVICE_PATH_SUB_TYPE_MSG_MMC;
- sddp->dp.length = sizeof(*sddp);
- sddp->slot_number = dev->seq;
- return &sddp[1];
- }
- #endif
- case UCLASS_MASS_STORAGE:
- case UCLASS_USB_HUB: {
- struct efi_device_path_usb_class *udp =
- dp_fill(buf, dev->parent);
- struct usb_device *udev = dev_get_parent_priv(dev);
- struct usb_device_descriptor *desc = &udev->descriptor;
- udp->dp.type = DEVICE_PATH_TYPE_MESSAGING_DEVICE;
- udp->dp.sub_type = DEVICE_PATH_SUB_TYPE_MSG_USB_CLASS;
- udp->dp.length = sizeof(*udp);
- udp->vendor_id = desc->idVendor;
- udp->product_id = desc->idProduct;
- udp->device_class = desc->bDeviceClass;
- udp->device_subclass = desc->bDeviceSubClass;
- udp->device_protocol = desc->bDeviceProtocol;
- return &udp[1];
- }
- default:
- debug("%s(%u) %s: unhandled device class: %s (%u)\n",
- __FILE__, __LINE__, __func__,
- dev->name, dev->driver->id);
- return dp_fill(buf, dev->parent);
- }
- }
- #endif
- static unsigned dp_part_size(struct blk_desc *desc, int part)
- {
- unsigned dpsize;
- #ifdef CONFIG_BLK
- {
- struct udevice *dev;
- int ret = blk_find_device(desc->if_type, desc->devnum, &dev);
- if (ret)
- dev = desc->bdev->parent;
- dpsize = dp_size(dev);
- }
- #else
- dpsize = sizeof(ROOT) + sizeof(struct efi_device_path_usb);
- #endif
- if (part == 0) /* the actual disk, not a partition */
- return dpsize;
- 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);
- return dpsize;
- }
- /*
- * Create a device node for a block device partition.
- *
- * @buf buffer to which the device path is written
- * @desc block device descriptor
- * @part partition number, 0 identifies a block device
- */
- static void *dp_part_node(void *buf, struct blk_desc *desc, int part)
- {
- disk_partition_t info;
- 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;
- 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_size = 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;
- 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;
- switch (desc->sig_type) {
- case SIG_TYPE_NONE:
- default:
- hddp->signature_type = 0;
- memset(hddp->partition_signature, 0,
- sizeof(hddp->partition_signature));
- break;
- case SIG_TYPE_MBR:
- hddp->signature_type = 1;
- memset(hddp->partition_signature, 0,
- sizeof(hddp->partition_signature));
- memcpy(hddp->partition_signature, &desc->mbr_sig,
- sizeof(desc->mbr_sig));
- break;
- case SIG_TYPE_GUID:
- hddp->signature_type = 2;
- memcpy(hddp->partition_signature, &desc->guid_sig,
- sizeof(hddp->partition_signature));
- break;
- }
- buf = &hddp[1];
- }
- return buf;
- }
- /*
- * Create a device path for a block device or one of its partitions.
- *
- * @buf buffer to which the device path is written
- * @desc block device descriptor
- * @part partition number, 0 identifies a block device
- */
- static void *dp_part_fill(void *buf, struct blk_desc *desc, int part)
- {
- #ifdef CONFIG_BLK
- {
- struct udevice *dev;
- int ret = blk_find_device(desc->if_type, desc->devnum, &dev);
- if (ret)
- dev = desc->bdev->parent;
- buf = dp_fill(buf, dev);
- }
- #else
- /*
- * We *could* make a more accurate path, by looking at if_type
- * and handling all the different cases like we do for non-
- * legacy (i.e. CONFIG_BLK=y) case. But most important thing
- * is just to have a unique device-path for if_type+devnum.
- * So map things to a fictitious USB device.
- */
- struct efi_device_path_usb *udp;
- memcpy(buf, &ROOT, sizeof(ROOT));
- buf += sizeof(ROOT);
- udp = buf;
- 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 = desc->if_type;
- udp->usb_interface = desc->devnum;
- buf = &udp[1];
- #endif
- if (part == 0) /* the actual disk, not a partition */
- return buf;
- return dp_part_node(buf, desc, part);
- }
- /* Construct a device-path from a partition on a block device: */
- struct efi_device_path *efi_dp_from_part(struct blk_desc *desc, int part)
- {
- void *buf, *start;
- start = buf = dp_alloc(dp_part_size(desc, part) + sizeof(END));
- if (!buf)
- return NULL;
- buf = dp_part_fill(buf, desc, part);
- *((struct efi_device_path *)buf) = END;
- return start;
- }
- /*
- * Create a device node for a block device partition.
- *
- * @buf buffer to which the device path is written
- * @desc block device descriptor
- * @part partition number, 0 identifies a block device
- */
- struct efi_device_path *efi_dp_part_node(struct blk_desc *desc, int part)
- {
- efi_uintn_t dpsize;
- void *buf;
- 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);
- buf = dp_alloc(dpsize);
- dp_part_node(buf, desc, part);
- return buf;
- }
- /**
- * path_to_uefi() - convert UTF-8 path to an UEFI style path
- *
- * Convert UTF-8 path to a UEFI style path (i.e. with backslashes as path
- * separators and UTF-16).
- *
- * @src: source buffer
- * @uefi: target buffer, possibly unaligned
- */
- static void path_to_uefi(void *uefi, const char *src)
- {
- u16 *pos = uefi;
- /*
- * efi_set_bootdev() calls this routine indirectly before the UEFI
- * subsystem is initialized. So we cannot assume unaligned access to be
- * enabled.
- */
- allow_unaligned();
- while (*src) {
- s32 code = utf8_get(&src);
- if (code < 0)
- code = '?';
- else if (code == '/')
- code = '\\';
- utf16_put(code, &pos);
- }
- *pos = 0;
- }
- /*
- * If desc is NULL, this creates a path with only the file component,
- * otherwise it creates a full path with both device and file components
- */
- struct efi_device_path *efi_dp_from_file(struct blk_desc *desc, int part,
- const char *path)
- {
- struct efi_device_path_file_path *fp;
- void *buf, *start;
- size_t dpsize = 0, fpsize;
- if (desc)
- dpsize = dp_part_size(desc, part);
- fpsize = sizeof(struct efi_device_path) +
- 2 * (utf8_utf16_strlen(path) + 1);
- if (fpsize > U16_MAX)
- return NULL;
- dpsize += fpsize;
- start = buf = dp_alloc(dpsize + sizeof(END));
- if (!buf)
- return NULL;
- if (desc)
- buf = dp_part_fill(buf, desc, part);
- /* add file-path: */
- fp = buf;
- fp->dp.type = DEVICE_PATH_TYPE_MEDIA_DEVICE;
- fp->dp.sub_type = DEVICE_PATH_SUB_TYPE_FILE_PATH;
- fp->dp.length = (u16)fpsize;
- path_to_uefi(fp->str, path);
- buf += fpsize;
- *((struct efi_device_path *)buf) = END;
- return start;
- }
- #ifdef CONFIG_NET
- struct efi_device_path *efi_dp_from_eth(void)
- {
- #ifndef CONFIG_DM_ETH
- struct efi_device_path_mac_addr *ndp;
- #endif
- void *buf, *start;
- unsigned dpsize = 0;
- assert(eth_get_dev());
- #ifdef CONFIG_DM_ETH
- dpsize += dp_size(eth_get_dev());
- #else
- dpsize += sizeof(ROOT);
- dpsize += sizeof(*ndp);
- #endif
- start = buf = dp_alloc(dpsize + sizeof(END));
- if (!buf)
- return NULL;
- #ifdef CONFIG_DM_ETH
- buf = dp_fill(buf, eth_get_dev());
- #else
- memcpy(buf, &ROOT, sizeof(ROOT));
- buf += sizeof(ROOT);
- ndp = buf;
- ndp->dp.type = DEVICE_PATH_TYPE_MESSAGING_DEVICE;
- ndp->dp.sub_type = DEVICE_PATH_SUB_TYPE_MSG_MAC_ADDR;
- ndp->dp.length = sizeof(*ndp);
- ndp->if_type = 1; /* Ethernet */
- memcpy(ndp->mac.addr, eth_get_ethaddr(), ARP_HLEN);
- buf = &ndp[1];
- #endif
- *((struct efi_device_path *)buf) = END;
- return start;
- }
- #endif
- /* Construct a device-path for memory-mapped image */
- struct efi_device_path *efi_dp_from_mem(uint32_t memory_type,
- uint64_t start_address,
- uint64_t end_address)
- {
- struct efi_device_path_memory *mdp;
- void *buf, *start;
- start = buf = dp_alloc(sizeof(*mdp) + sizeof(END));
- if (!buf)
- return NULL;
- mdp = buf;
- mdp->dp.type = DEVICE_PATH_TYPE_HARDWARE_DEVICE;
- mdp->dp.sub_type = DEVICE_PATH_SUB_TYPE_MEMORY;
- mdp->dp.length = sizeof(*mdp);
- mdp->memory_type = memory_type;
- mdp->start_address = start_address;
- mdp->end_address = end_address;
- buf = &mdp[1];
- *((struct efi_device_path *)buf) = END;
- return start;
- }
- /**
- * efi_dp_split_file_path() - split of relative file path from device path
- *
- * Given a device path indicating a file on a device, separate the device
- * path in two: the device path of the actual device and the file path
- * relative to this device.
- *
- * @full_path: device path including device and file path
- * @device_path: path of the device
- * @file_path: relative path of the file or NULL if there is none
- * Return: status code
- */
- efi_status_t efi_dp_split_file_path(struct efi_device_path *full_path,
- struct efi_device_path **device_path,
- struct efi_device_path **file_path)
- {
- struct efi_device_path *p, *dp, *fp = NULL;
- *device_path = NULL;
- *file_path = NULL;
- dp = efi_dp_dup(full_path);
- if (!dp)
- return EFI_OUT_OF_RESOURCES;
- p = dp;
- while (!EFI_DP_TYPE(p, MEDIA_DEVICE, FILE_PATH)) {
- p = efi_dp_next(p);
- if (!p)
- goto out;
- }
- fp = efi_dp_dup(p);
- if (!fp)
- return EFI_OUT_OF_RESOURCES;
- p->type = DEVICE_PATH_TYPE_END;
- p->sub_type = DEVICE_PATH_SUB_TYPE_END;
- p->length = sizeof(*p);
- out:
- *device_path = dp;
- *file_path = fp;
- return EFI_SUCCESS;
- }
- /**
- * efi_dp_from_name() - convert U-Boot device and file path to device path
- *
- * @dev: U-Boot device, e.g. 'mmc'
- * @devnr: U-Boot device number, e.g. 1 for 'mmc:1'
- * @path: file path relative to U-Boot device, may be NULL
- * @device: pointer to receive device path of the device
- * @file: pointer to receive device path for the file
- * Return: status code
- */
- efi_status_t efi_dp_from_name(const char *dev, const char *devnr,
- const char *path,
- struct efi_device_path **device,
- struct efi_device_path **file)
- {
- int is_net;
- struct blk_desc *desc = NULL;
- disk_partition_t fs_partition;
- int part = 0;
- char filename[32] = { 0 }; /* dp->str is u16[32] long */
- char *s;
- if (path && !file)
- return EFI_INVALID_PARAMETER;
- is_net = !strcmp(dev, "Net");
- if (!is_net) {
- part = blk_get_device_part_str(dev, devnr, &desc, &fs_partition,
- 1);
- if (part < 0 || !desc)
- return EFI_INVALID_PARAMETER;
- if (device)
- *device = efi_dp_from_part(desc, part);
- } else {
- #ifdef CONFIG_NET
- if (device)
- *device = efi_dp_from_eth();
- #endif
- }
- if (!path)
- return EFI_SUCCESS;
- snprintf(filename, sizeof(filename), "%s", path);
- /* DOS style file path: */
- s = filename;
- while ((s = strchr(s, '/')))
- *s++ = '\\';
- *file = efi_dp_from_file(is_net ? NULL : desc, part, filename);
- if (!*file)
- return EFI_INVALID_PARAMETER;
- return EFI_SUCCESS;
- }
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