u-boot/lib/efi_loader/efi_device_path.c

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// SPDX-License-Identifier: GPL-2.0+
/*
* EFI device path from u-boot device-model mapping
*
* (C) Copyright 2017 Rob Clark
*/
#define LOG_CATEGORY LOGC_EFI
#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 <uuid.h>
#include <asm-generic/unaligned.h>
#include <linux/compat.h> /* U16_MAX */
efi_loader: device_path: support Sandbox's "host" devices Sandbox's "host" devices are currently described as UCLASS_ROOT udevice with DEV_IF_HOST block device. As the current implementation of efi_device_path doesn't support such a type, any "host" device on sandbox cannot be seen as a distinct object. For example, => host bind 0 /foo/disk.img => efi devices Scanning disk host0... Found 1 disks Device Device Path ================ ==================== 0000000015c19970 /VenHw(e61d73b9-a384-4acc-aeab-82e828f3628b) 0000000015c19d70 /VenHw(e61d73b9-a384-4acc-aeab-82e828f3628b) => efi dh Handle Protocols ================ ==================== 0000000015c19970 Device Path, Device Path To Text, Device Path Utilities, Unicode Collation 2, HII String, HII Database, HII Config Routing 0000000015c19ba0 Driver Binding 0000000015c19c10 Simple Text Output 0000000015c19c80 Simple Text Input, Simple Text Input Ex 0000000015c19d70 Block IO, Device Path, Simple File System As you can see here, efi_root (0x0000000015c19970) and host0 device (0x0000000015c19d70) have the same representation of device path. This is not only inconvenient, but also confusing since two different efi objects are associated with the same device path and efi_dp_find_obj() will possibly return a wrong result. Solution: Each "host" device should be given an additional device path node of "vendor device path" to make it distinguishable. Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org> Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de> Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
2019-09-12 04:52:35 +00:00
#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
efi_loader: device_path: support Sandbox's "host" devices Sandbox's "host" devices are currently described as UCLASS_ROOT udevice with DEV_IF_HOST block device. As the current implementation of efi_device_path doesn't support such a type, any "host" device on sandbox cannot be seen as a distinct object. For example, => host bind 0 /foo/disk.img => efi devices Scanning disk host0... Found 1 disks Device Device Path ================ ==================== 0000000015c19970 /VenHw(e61d73b9-a384-4acc-aeab-82e828f3628b) 0000000015c19d70 /VenHw(e61d73b9-a384-4acc-aeab-82e828f3628b) => efi dh Handle Protocols ================ ==================== 0000000015c19970 Device Path, Device Path To Text, Device Path Utilities, Unicode Collation 2, HII String, HII Database, HII Config Routing 0000000015c19ba0 Driver Binding 0000000015c19c10 Simple Text Output 0000000015c19c80 Simple Text Input, Simple Text Input Ex 0000000015c19d70 Block IO, Device Path, Simple File System As you can see here, efi_root (0x0000000015c19970) and host0 device (0x0000000015c19d70) have the same representation of device path. This is not only inconvenient, but also confusing since two different efi objects are associated with the same device path and efi_dp_find_obj() will possibly return a wrong result. Solution: Each "host" device should be given an additional device path node of "vendor device path" to make it distinguishable. Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org> Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de> Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
2019-09-12 04:52:35 +00:00
/* template END node: */
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_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
/*
* 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;
}
}
/**
* efi_dp_shorten() - shorten device-path
*
* When creating a short boot option we want to use a device-path that is
* independent of the location where the block device is plugged in.
*
* UsbWwi() nodes contain a serial number, hard drive paths a partition
* UUID. Both should be unique.
*
* See UEFI spec, section 3.1.2 for "short-form device path".
*
* @dp: original device-path
* @Return: shortened device-path or NULL
*/
struct efi_device_path *efi_dp_shorten(struct efi_device_path *dp)
{
while (dp) {
if (EFI_DP_TYPE(dp, MESSAGING_DEVICE, MSG_USB_WWI) ||
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;
}
/**
* find_handle() - find handle by device path and installed protocol
*
* If @rem is provided, the handle with the longest partial match is returned.
*
* @dp: device path to search
* @guid: GUID of protocol that must be installed on path or NULL
* @short_path: use short form device path for matching
* @rem: pointer to receive remaining device path
* Return: matching handle
*/
static efi_handle_t find_handle(struct efi_device_path *dp,
const efi_guid_t *guid, bool short_path,
struct efi_device_path **rem)
{
efi_handle_t handle, best_handle = NULL;
efi_uintn_t len, best_len = 0;
len = efi_dp_instance_size(dp);
list_for_each_entry(handle, &efi_obj_list, link) {
struct efi_handler *handler;
struct efi_device_path *dp_current;
efi_uintn_t len_current;
efi_status_t ret;
if (guid) {
ret = efi_search_protocol(handle, guid, &handler);
if (ret != EFI_SUCCESS)
continue;
}
ret = efi_search_protocol(handle, &efi_guid_device_path,
&handler);
if (ret != EFI_SUCCESS)
continue;
dp_current = handler->protocol_interface;
if (short_path) {
dp_current = efi_dp_shorten(dp_current);
if (!dp_current)
continue;
}
len_current = efi_dp_instance_size(dp_current);
if (rem) {
if (len_current > len)
continue;
} else {
if (len_current != len)
continue;
}
if (memcmp(dp_current, dp, len_current))
continue;
if (!rem)
return handle;
if (len_current > best_len) {
best_len = len_current;
best_handle = handle;
*rem = (void*)((u8 *)dp + len_current);
}
}
return best_handle;
}
/**
* efi_dp_find_obj() - find handle by device path
*
* If @rem is provided, the handle with the longest partial match is returned.
*
* @dp: device path to search
* @guid: GUID of protocol that must be installed on path or NULL
* @rem: pointer to receive remaining device path
* Return: matching handle
*/
efi_handle_t efi_dp_find_obj(struct efi_device_path *dp,
const efi_guid_t *guid,
struct efi_device_path **rem)
{
efi_handle_t handle;
handle = find_handle(dp, guid, false, rem);
if (!handle)
/* Match short form device path */
handle = find_handle(dp, guid, true, rem);
return handle;
}
/*
* 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 = efi_alloc(sz);
if (!ndp)
return NULL;
memcpy(ndp, dp, sz);
return ndp;
}
/**
* efi_dp_append_or_concatenate() - Append or concatenate two device paths.
* Concatenated device path will be separated
* by a sub-type 0xff end node
*
* @dp1: First device path
* @dp2: Second device path
* @concat: If true the two device paths will be concatenated and separated
* by an end of entrire device path sub-type 0xff end node.
* If true the second device path will be appended to the first and
* terminated by an end node
*
* Return:
* concatenated device path or NULL. Caller must free the returned value
*/
static struct
efi_device_path *efi_dp_append_or_concatenate(const struct efi_device_path *dp1,
const struct efi_device_path *dp2,
bool concat)
{
struct efi_device_path *ret;
size_t end_size = sizeof(END);
if (concat)
end_size = 2 * sizeof(END);
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 = efi_alloc(sz1 + sz2 + end_size);
if (!p)
return NULL;
ret = p;
memcpy(p, dp1, sz1);
p += sz1;
if (concat) {
memcpy(p, &END, sizeof(END));
p += sizeof(END);
}
/* the end node of the second device path has to be retained */
memcpy(p, dp2, sz2);
p += sz2;
memcpy(p, &END, sizeof(END));
}
return ret;
}
/**
* efi_dp_append() - Append a device to an existing device path.
*
* @dp1: First device path
* @dp2: Second device path
*
* Return:
* concatenated device path or NULL. Caller must free the returned value
*/
struct efi_device_path *efi_dp_append(const struct efi_device_path *dp1,
const struct efi_device_path *dp2)
{
return efi_dp_append_or_concatenate(dp1, dp2, false);
}
/**
* efi_dp_concat() - Concatenate 2 device paths. The final device path will
* contain two device paths separated by and end node (0xff).
*
* @dp1: First device path
* @dp2: Second device path
*
* Return:
* concatenated device path or NULL. Caller must free the returned value
*/
struct efi_device_path *efi_dp_concat(const struct efi_device_path *dp1,
const struct efi_device_path *dp2)
{
return efi_dp_append_or_concatenate(dp1, dp2, true);
}
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 = efi_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 = efi_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 = efi_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 = efi_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 = efi_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;
}
/* 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 (device_get_uclass_id(dev)) {
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);
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)
case UCLASS_SCSI:
return dp_size(dev->parent) +
sizeof(struct efi_device_path_scsi);
#endif
#if defined(CONFIG_MMC)
case UCLASS_MMC:
return dp_size(dev->parent) +
sizeof(struct efi_device_path_sd_mmc_path);
efi_loader: device_path: support Sandbox's "host" devices Sandbox's "host" devices are currently described as UCLASS_ROOT udevice with DEV_IF_HOST block device. As the current implementation of efi_device_path doesn't support such a type, any "host" device on sandbox cannot be seen as a distinct object. For example, => host bind 0 /foo/disk.img => efi devices Scanning disk host0... Found 1 disks Device Device Path ================ ==================== 0000000015c19970 /VenHw(e61d73b9-a384-4acc-aeab-82e828f3628b) 0000000015c19d70 /VenHw(e61d73b9-a384-4acc-aeab-82e828f3628b) => efi dh Handle Protocols ================ ==================== 0000000015c19970 Device Path, Device Path To Text, Device Path Utilities, Unicode Collation 2, HII String, HII Database, HII Config Routing 0000000015c19ba0 Driver Binding 0000000015c19c10 Simple Text Output 0000000015c19c80 Simple Text Input, Simple Text Input Ex 0000000015c19d70 Block IO, Device Path, Simple File System As you can see here, efi_root (0x0000000015c19970) and host0 device (0x0000000015c19d70) have the same representation of device path. This is not only inconvenient, but also confusing since two different efi objects are associated with the same device path and efi_dp_find_obj() will possibly return a wrong result. Solution: Each "host" device should be given an additional device path node of "vendor device path" to make it distinguishable. Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org> Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de> Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
2019-09-12 04:52:35 +00:00
#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
efi_loader: device_path: support Sandbox's "host" devices Sandbox's "host" devices are currently described as UCLASS_ROOT udevice with DEV_IF_HOST block device. As the current implementation of efi_device_path doesn't support such a type, any "host" device on sandbox cannot be seen as a distinct object. For example, => host bind 0 /foo/disk.img => efi devices Scanning disk host0... Found 1 disks Device Device Path ================ ==================== 0000000015c19970 /VenHw(e61d73b9-a384-4acc-aeab-82e828f3628b) 0000000015c19d70 /VenHw(e61d73b9-a384-4acc-aeab-82e828f3628b) => efi dh Handle Protocols ================ ==================== 0000000015c19970 Device Path, Device Path To Text, Device Path Utilities, Unicode Collation 2, HII String, HII Database, HII Config Routing 0000000015c19ba0 Driver Binding 0000000015c19c10 Simple Text Output 0000000015c19c80 Simple Text Input, Simple Text Input Ex 0000000015c19d70 Block IO, Device Path, Simple File System As you can see here, efi_root (0x0000000015c19970) and host0 device (0x0000000015c19d70) have the same representation of device path. This is not only inconvenient, but also confusing since two different efi objects are associated with the same device path and efi_dp_find_obj() will possibly return a wrong result. Solution: Each "host" device should be given an additional device path node of "vendor device path" to make it distinguishable. Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org> Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de> Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
2019-09-12 04:52:35 +00:00
#ifdef CONFIG_SANDBOX
case UCLASS_HOST:
efi_loader: device_path: support Sandbox's "host" devices Sandbox's "host" devices are currently described as UCLASS_ROOT udevice with DEV_IF_HOST block device. As the current implementation of efi_device_path doesn't support such a type, any "host" device on sandbox cannot be seen as a distinct object. For example, => host bind 0 /foo/disk.img => efi devices Scanning disk host0... Found 1 disks Device Device Path ================ ==================== 0000000015c19970 /VenHw(e61d73b9-a384-4acc-aeab-82e828f3628b) 0000000015c19d70 /VenHw(e61d73b9-a384-4acc-aeab-82e828f3628b) => efi dh Handle Protocols ================ ==================== 0000000015c19970 Device Path, Device Path To Text, Device Path Utilities, Unicode Collation 2, HII String, HII Database, HII Config Routing 0000000015c19ba0 Driver Binding 0000000015c19c10 Simple Text Output 0000000015c19c80 Simple Text Input, Simple Text Input Ex 0000000015c19d70 Block IO, Device Path, Simple File System As you can see here, efi_root (0x0000000015c19970) and host0 device (0x0000000015c19d70) have the same representation of device path. This is not only inconvenient, but also confusing since two different efi objects are associated with the same device path and efi_dp_find_obj() will possibly return a wrong result. Solution: Each "host" device should be given an additional device path node of "vendor device path" to make it distinguishable. Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org> Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de> Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
2019-09-12 04:52:35 +00:00
/*
* 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_USB
case UCLASS_MASS_STORAGE:
return dp_size(dev->parent)
+ sizeof(struct efi_device_path_controller);
#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);
}
#if 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);
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 (device_get_uclass_id(dev)) {
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_NETDEVICES
case UCLASS_ETH: {
struct efi_device_path_mac_addr *dp =
dp_fill(buf, dev->parent);
struct eth_pdata *pdata = dev_get_plat(dev);
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
case UCLASS_BLK:
switch (dev->parent->uclass->uc_drv->id) {
efi_loader: device_path: support Sandbox's "host" devices Sandbox's "host" devices are currently described as UCLASS_ROOT udevice with DEV_IF_HOST block device. As the current implementation of efi_device_path doesn't support such a type, any "host" device on sandbox cannot be seen as a distinct object. For example, => host bind 0 /foo/disk.img => efi devices Scanning disk host0... Found 1 disks Device Device Path ================ ==================== 0000000015c19970 /VenHw(e61d73b9-a384-4acc-aeab-82e828f3628b) 0000000015c19d70 /VenHw(e61d73b9-a384-4acc-aeab-82e828f3628b) => efi dh Handle Protocols ================ ==================== 0000000015c19970 Device Path, Device Path To Text, Device Path Utilities, Unicode Collation 2, HII String, HII Database, HII Config Routing 0000000015c19ba0 Driver Binding 0000000015c19c10 Simple Text Output 0000000015c19c80 Simple Text Input, Simple Text Input Ex 0000000015c19d70 Block IO, Device Path, Simple File System As you can see here, efi_root (0x0000000015c19970) and host0 device (0x0000000015c19d70) have the same representation of device path. This is not only inconvenient, but also confusing since two different efi objects are associated with the same device path and efi_dp_find_obj() will possibly return a wrong result. Solution: Each "host" device should be given an additional device path node of "vendor device path" to make it distinguishable. Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org> Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de> Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
2019-09-12 04:52:35 +00:00
#ifdef CONFIG_SANDBOX
case UCLASS_HOST: {
efi_loader: device_path: support Sandbox's "host" devices Sandbox's "host" devices are currently described as UCLASS_ROOT udevice with DEV_IF_HOST block device. As the current implementation of efi_device_path doesn't support such a type, any "host" device on sandbox cannot be seen as a distinct object. For example, => host bind 0 /foo/disk.img => efi devices Scanning disk host0... Found 1 disks Device Device Path ================ ==================== 0000000015c19970 /VenHw(e61d73b9-a384-4acc-aeab-82e828f3628b) 0000000015c19d70 /VenHw(e61d73b9-a384-4acc-aeab-82e828f3628b) => efi dh Handle Protocols ================ ==================== 0000000015c19970 Device Path, Device Path To Text, Device Path Utilities, Unicode Collation 2, HII String, HII Database, HII Config Routing 0000000015c19ba0 Driver Binding 0000000015c19c10 Simple Text Output 0000000015c19c80 Simple Text Input, Simple Text Input Ex 0000000015c19d70 Block IO, Device Path, Simple File System As you can see here, efi_root (0x0000000015c19970) and host0 device (0x0000000015c19d70) have the same representation of device path. This is not only inconvenient, but also confusing since two different efi objects are associated with the same device path and efi_dp_find_obj() will possibly return a wrong result. Solution: Each "host" device should be given an additional device path node of "vendor device path" to make it distinguishable. Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org> Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de> Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
2019-09-12 04:52:35 +00:00
/* stop traversing parents at this point: */
struct efi_device_path_vendor *dp;
struct blk_desc *desc = dev_get_uclass_plat(dev);
efi_loader: device_path: support Sandbox's "host" devices Sandbox's "host" devices are currently described as UCLASS_ROOT udevice with DEV_IF_HOST block device. As the current implementation of efi_device_path doesn't support such a type, any "host" device on sandbox cannot be seen as a distinct object. For example, => host bind 0 /foo/disk.img => efi devices Scanning disk host0... Found 1 disks Device Device Path ================ ==================== 0000000015c19970 /VenHw(e61d73b9-a384-4acc-aeab-82e828f3628b) 0000000015c19d70 /VenHw(e61d73b9-a384-4acc-aeab-82e828f3628b) => efi dh Handle Protocols ================ ==================== 0000000015c19970 Device Path, Device Path To Text, Device Path Utilities, Unicode Collation 2, HII String, HII Database, HII Config Routing 0000000015c19ba0 Driver Binding 0000000015c19c10 Simple Text Output 0000000015c19c80 Simple Text Input, Simple Text Input Ex 0000000015c19d70 Block IO, Device Path, Simple File System As you can see here, efi_root (0x0000000015c19970) and host0 device (0x0000000015c19d70) have the same representation of device path. This is not only inconvenient, but also confusing since two different efi objects are associated with the same device path and efi_dp_find_obj() will possibly return a wrong result. Solution: Each "host" device should be given an additional device path node of "vendor device path" to make it distinguishable. Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org> Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de> Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
2019-09-12 04:52:35 +00:00
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)
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_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
#if defined(CONFIG_USB)
case UCLASS_MASS_STORAGE: {
struct blk_desc *desc = dev_get_uclass_plat(dev);
struct efi_device_path_controller *dp =
dp_fill(buf, dev->parent);
dp->dp.type = DEVICE_PATH_TYPE_HARDWARE_DEVICE;
dp->dp.sub_type = DEVICE_PATH_SUB_TYPE_CONTROLLER;
dp->dp.length = sizeof(*dp);
dp->controller_number = desc->lun;
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);
}
#if 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 *udp = dp_fill(buf, dev->parent);
switch (device_get_uclass_id(dev->parent)) {
case UCLASS_USB_HUB: {
struct usb_device *udev = dev_get_parent_priv(dev);
udp->parent_port_number = udev->portnr;
break;
}
default:
udp->parent_port_number = 0;
}
udp->dp.type = DEVICE_PATH_TYPE_MESSAGING_DEVICE;
udp->dp.sub_type = DEVICE_PATH_SUB_TYPE_MSG_USB;
udp->dp.length = sizeof(*udp);
udp->usb_interface = 0;
return &udp[1];
}
default:
/* If the uclass driver is missing, this will show NULL */
log_debug("unhandled device class: %s (%s)\n", dev->name,
dev_get_uclass_name(dev));
return dp_fill(buf, dev->parent);
}
}
static unsigned dp_part_size(struct blk_desc *desc, int part)
{
unsigned dpsize;
struct udevice *dev = desc->bdev;
dpsize = dp_size(dev);
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;
#if CONFIG_IS_ENABLED(PARTITION_UUIDS)
/* info.uuid exists only with PARTITION_UUIDS */
if (uuid_str_to_bin(info.uuid,
hddp->partition_signature,
UUID_STR_FORMAT_GUID)) {
log_warning(
"Partition %d: invalid GUID %s\n",
part, info.uuid);
}
#endif
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)
{
struct udevice *dev = desc->bdev;
buf = dp_fill(buf, dev);
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 = efi_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 = efi_alloc(dpsize);
if (buf)
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;
}
/**
* efi_dp_from_file() - create device path for file
*
* The function creates a device path from the block descriptor @desc and the
* partition number @part and appends a device path node created describing the
* file path @path.
*
* If @desc is NULL, the device path will not contain nodes describing the
* partition.
* If @path is an empty string "", the device path will not contain a node
* for the file path.
*
* @desc: block device descriptor or NULL
* @part: partition number
* @path: file path on partition or ""
* Return: device path or NULL in case of an error
*/
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 = efi_alloc(dpsize + sizeof(END));
if (!buf)
return NULL;
if (desc)
buf = dp_part_fill(buf, desc, part);
/* add file-path: */
if (*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;
}
struct efi_device_path *efi_dp_from_uart(void)
{
void *buf, *pos;
struct efi_device_path_uart *uart;
size_t dpsize = sizeof(ROOT) + sizeof(*uart) + sizeof(END);
buf = efi_alloc(dpsize);
if (!buf)
return NULL;
pos = buf;
memcpy(pos, &ROOT, sizeof(ROOT));
pos += sizeof(ROOT);
uart = pos;
uart->dp.type = DEVICE_PATH_TYPE_MESSAGING_DEVICE;
uart->dp.sub_type = DEVICE_PATH_SUB_TYPE_MSG_UART;
uart->dp.length = sizeof(*uart);
pos += sizeof(*uart);
memcpy(pos, &END, sizeof(END));
return buf;
}
#ifdef CONFIG_NETDEVICES
struct efi_device_path *efi_dp_from_eth(void)
{
void *buf, *start;
unsigned dpsize = 0;
assert(eth_get_dev());
dpsize += dp_size(eth_get_dev());
start = buf = efi_alloc(dpsize + sizeof(END));
if (!buf)
return NULL;
buf = dp_fill(buf, eth_get_dev());
*((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 = efi_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)
{
struct blk_desc *desc = NULL;
struct disk_partition fs_partition;
size_t image_size;
void *image_addr;
int part = 0;
char *filename;
char *s;
if (path && !file)
return EFI_INVALID_PARAMETER;
if (!strcmp(dev, "Net")) {
#ifdef CONFIG_NETDEVICES
if (device)
*device = efi_dp_from_eth();
#endif
} else if (!strcmp(dev, "Uart")) {
if (device)
*device = efi_dp_from_uart();
} else if (!strcmp(dev, "Mem")) {
efi_get_image_parameters(&image_addr, &image_size);
if (device)
*device = efi_dp_from_mem(EFI_RESERVED_MEMORY_TYPE,
(uintptr_t)image_addr,
image_size);
} else {
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);
}
if (!path)
return EFI_SUCCESS;
filename = calloc(1, strlen(path) + 1);
if (!filename)
return EFI_OUT_OF_RESOURCES;
sprintf(filename, "%s", path);
/* DOS style file path: */
s = filename;
while ((s = strchr(s, '/')))
*s++ = '\\';
*file = efi_dp_from_file(desc, part, filename);
free(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);
}
}
/**
* efi_dp_from_lo() - Get the instance of a VenMedia node in a
* multi-instance device path that matches
* a specific GUID. This kind of device paths
* is found in Boot#### options describing an
* initrd location
*
* @lo: EFI_LOAD_OPTION containing a valid device path
* @guid: guid to search for
*
* Return:
* device path including the VenMedia node or NULL.
* Caller must free the returned value.
*/
struct
efi_device_path *efi_dp_from_lo(struct efi_load_option *lo,
const efi_guid_t *guid)
{
struct efi_device_path *fp = lo->file_path;
struct efi_device_path_vendor *vendor;
int lo_len = lo->file_path_length;
for (; lo_len >= sizeof(struct efi_device_path);
lo_len -= fp->length, fp = (void *)fp + fp->length) {
if (lo_len < 0 || efi_dp_check_length(fp, lo_len) < 0)
break;
if (fp->type != DEVICE_PATH_TYPE_MEDIA_DEVICE ||
fp->sub_type != DEVICE_PATH_SUB_TYPE_VENDOR_PATH)
continue;
vendor = (struct efi_device_path_vendor *)fp;
if (!guidcmp(&vendor->guid, guid))
return efi_dp_dup(efi_dp_next(fp));
}
log_debug("VenMedia(%pUl) not found in %ls\n", &guid, lo->label);
return NULL;
}
/**
* search_gpt_dp_node() - search gpt device path node
*
* @device_path: device path
*
* Return: pointer to the gpt device path node
*/
struct efi_device_path *search_gpt_dp_node(struct efi_device_path *device_path)
{
struct efi_device_path *dp = device_path;
while (dp) {
if (dp->type == DEVICE_PATH_TYPE_MEDIA_DEVICE &&
dp->sub_type == DEVICE_PATH_SUB_TYPE_HARD_DRIVE_PATH) {
struct efi_device_path_hard_drive_path *hd_dp =
(struct efi_device_path_hard_drive_path *)dp;
if (hd_dp->partmap_type == PART_FORMAT_GPT &&
hd_dp->signature_type == SIG_TYPE_GUID)
return dp;
}
dp = efi_dp_next(dp);
}
return NULL;
}