leandrof/u-boot
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
c0c21d67f0
u-boot/lib/efi_loader/efi_device_path.c
Simon Glass 8b85dfc675 dm: Avoid accessing seq directly 
At present various drivers etc. access the device's 'seq' member directly.
This makes it harder to change the meaning of that member. Change access
to go through a function instead.

The drivers/i2c/lpc32xx_i2c.c file is left unchanged for now.

Signed-off-by: Simon Glass <sjg@chromium.org>
2020-12-18 20:32:21 -07:00

1163 lines
28 KiB
C
Raw Blame History

// 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 <log.h>
#include <net.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
#ifdef CONFIG_VIRTIO_BLK
const efi_guid_t efi_guid_virtio_dev = U_BOOT_VIRTIO_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_AHCI) || defined(CONFIG_SATA)
case UCLASS_AHCI:
return dp_size(dev->parent) +
sizeof(struct efi_device_path_sata);
#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
#ifdef CONFIG_VIRTIO_BLK
case UCLASS_VIRTIO:
/*
* Virtio devices will be represented as a vendor
* device node with an extra byte for the 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->plat;
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;
struct blk_desc *desc = dev_get_uclass_plat(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_VIRTIO_BLK
case UCLASS_VIRTIO: {
struct efi_device_path_vendor *dp;
struct blk_desc *desc = dev_get_uclass_plat(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_virtio_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_plat(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_plat(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_plat(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(dev);
return &sddp[1];
}
#endif
#if defined(CONFIG_AHCI) || defined(CONFIG_SATA)
case UCLASS_AHCI: {
struct efi_device_path_sata *dp =
dp_fill(buf, dev->parent);
struct blk_desc *desc = dev_get_uclass_plat(dev);
dp->dp.type = DEVICE_PATH_TYPE_MESSAGING_DEVICE;
dp->dp.sub_type = DEVICE_PATH_SUB_TYPE_MSG_SATA;
dp->dp.length = sizeof(*dp);
dp->hba_port = desc->devnum;
/* default 0xffff implies no port multiplier */
dp->port_multiplier_port = 0xffff;
dp->logical_unit_number = desc->lun;
return &dp[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(dev);
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)
{
struct disk_partition 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;
struct disk_partition 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;
}
/**
* efi_dp_check_length() - check length of a device path
*
* @dp: pointer to device path
* @maxlen: maximum length of the device path
* Return:
* * length of the device path if it is less or equal @maxlen
* * -1 if the device path is longer then @maxlen
* * -1 if a device path node has a length of less than 4
* * -EINVAL if maxlen exceeds SSIZE_MAX
*/
ssize_t efi_dp_check_length(const struct efi_device_path *dp,
const size_t maxlen)
{
ssize_t ret = 0;
u16 len;
if (maxlen > SSIZE_MAX)
return -EINVAL;
for (;;) {
len = dp->length;
if (len < 4)
return -1;
ret += len;
if (ret > maxlen)
return -1;
if (dp->type == DEVICE_PATH_TYPE_END &&
dp->sub_type == DEVICE_PATH_SUB_TYPE_END)
return ret;
dp = (const struct efi_device_path *)((const u8 *)dp + len);
}
}
Reference in New Issue View Git Blame Copy Permalink