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https://github.com/brain-hackers/u-boot-brain
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![Rob Clark](/assets/img/avatar_default.png)
When we don't have a real device/image path, such as 'bootefi hello',
construct a mem-mapped device-path.
This fixes 'bootefi hello' after devicepath refactoring.
Fixes: 95c5553ea2
("efi_loader: refactor boot device and loaded_image handling")
Signed-off-by: Rob Clark <robdclark@gmail.com>
Acked-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Signed-off-by: Alexander Graf <agraf@suse.de>
588 lines
14 KiB
C
588 lines
14 KiB
C
/*
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* EFI device path from u-boot device-model mapping
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*
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* (C) Copyright 2017 Rob Clark
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <blk.h>
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#include <dm.h>
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#include <usb.h>
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#include <mmc.h>
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#include <efi_loader.h>
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#include <inttypes.h>
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#include <part.h>
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/* template END node: */
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static const struct efi_device_path END = {
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.type = DEVICE_PATH_TYPE_END,
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.sub_type = DEVICE_PATH_SUB_TYPE_END,
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.length = sizeof(END),
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};
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#define U_BOOT_GUID \
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EFI_GUID(0xe61d73b9, 0xa384, 0x4acc, \
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0xae, 0xab, 0x82, 0xe8, 0x28, 0xf3, 0x62, 0x8b)
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/* template ROOT node: */
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static const struct efi_device_path_vendor ROOT = {
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.dp = {
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.type = DEVICE_PATH_TYPE_HARDWARE_DEVICE,
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.sub_type = DEVICE_PATH_SUB_TYPE_VENDOR,
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.length = sizeof(ROOT),
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},
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.guid = U_BOOT_GUID,
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};
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static void *dp_alloc(size_t sz)
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{
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void *buf;
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if (efi_allocate_pool(EFI_ALLOCATE_ANY_PAGES, sz, &buf) != EFI_SUCCESS)
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return NULL;
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return buf;
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}
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/*
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* Iterate to next block in device-path, terminating (returning NULL)
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* at /End* node.
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*/
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struct efi_device_path *efi_dp_next(const struct efi_device_path *dp)
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{
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if (dp == NULL)
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return NULL;
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if (dp->type == DEVICE_PATH_TYPE_END)
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return NULL;
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dp = ((void *)dp) + dp->length;
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if (dp->type == DEVICE_PATH_TYPE_END)
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return NULL;
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return (struct efi_device_path *)dp;
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}
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/*
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* Compare two device-paths, stopping when the shorter of the two hits
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* an End* node. This is useful to, for example, compare a device-path
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* representing a device with one representing a file on the device, or
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* a device with a parent device.
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*/
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int efi_dp_match(struct efi_device_path *a, struct efi_device_path *b)
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{
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while (1) {
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int ret;
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ret = memcmp(&a->length, &b->length, sizeof(a->length));
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if (ret)
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return ret;
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ret = memcmp(a, b, a->length);
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if (ret)
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return ret;
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a = efi_dp_next(a);
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b = efi_dp_next(b);
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if (!a || !b)
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return 0;
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}
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}
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/*
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* See UEFI spec (section 3.1.2, about short-form device-paths..
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* tl;dr: we can have a device-path that starts with a USB WWID
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* or USB Class node, and a few other cases which don't encode
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* the full device path with bus hierarchy:
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*
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* - MESSAGING:USB_WWID
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* - MESSAGING:USB_CLASS
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* - MEDIA:FILE_PATH
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* - MEDIA:HARD_DRIVE
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* - MESSAGING:URI
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*/
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static struct efi_device_path *shorten_path(struct efi_device_path *dp)
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{
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while (dp) {
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/*
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* TODO: Add MESSAGING:USB_WWID and MESSAGING:URI..
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* in practice fallback.efi just uses MEDIA:HARD_DRIVE
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* so not sure when we would see these other cases.
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*/
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if (EFI_DP_TYPE(dp, MESSAGING_DEVICE, MSG_USB_CLASS) ||
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EFI_DP_TYPE(dp, MEDIA_DEVICE, HARD_DRIVE_PATH) ||
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EFI_DP_TYPE(dp, MEDIA_DEVICE, FILE_PATH))
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return dp;
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dp = efi_dp_next(dp);
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}
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return dp;
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}
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static struct efi_object *find_obj(struct efi_device_path *dp, bool short_path,
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struct efi_device_path **rem)
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{
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struct efi_object *efiobj;
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list_for_each_entry(efiobj, &efi_obj_list, link) {
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int i;
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for (i = 0; i < ARRAY_SIZE(efiobj->protocols); i++) {
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struct efi_handler *handler = &efiobj->protocols[i];
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struct efi_device_path *obj_dp;
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if (!handler->guid)
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break;
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if (guidcmp(handler->guid, &efi_guid_device_path))
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continue;
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obj_dp = handler->protocol_interface;
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do {
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if (efi_dp_match(dp, obj_dp) == 0) {
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if (rem) {
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*rem = ((void *)dp) +
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efi_dp_size(obj_dp);
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}
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return efiobj;
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}
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obj_dp = shorten_path(efi_dp_next(obj_dp));
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} while (short_path && obj_dp);
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}
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}
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return NULL;
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}
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/*
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* Find an efiobj from device-path, if 'rem' is not NULL, returns the
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* remaining part of the device path after the matched object.
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*/
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struct efi_object *efi_dp_find_obj(struct efi_device_path *dp,
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struct efi_device_path **rem)
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{
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struct efi_object *efiobj;
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efiobj = find_obj(dp, false, rem);
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if (!efiobj)
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efiobj = find_obj(dp, true, rem);
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return efiobj;
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}
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/* return size not including End node: */
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unsigned efi_dp_size(const struct efi_device_path *dp)
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{
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unsigned sz = 0;
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while (dp) {
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sz += dp->length;
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dp = efi_dp_next(dp);
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}
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return sz;
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}
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struct efi_device_path *efi_dp_dup(const struct efi_device_path *dp)
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{
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struct efi_device_path *ndp;
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unsigned sz = efi_dp_size(dp) + sizeof(END);
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if (!dp)
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return NULL;
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ndp = dp_alloc(sz);
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memcpy(ndp, dp, sz);
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return ndp;
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}
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struct efi_device_path *efi_dp_append(const struct efi_device_path *dp1,
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const struct efi_device_path *dp2)
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{
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struct efi_device_path *ret;
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if (!dp1) {
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ret = efi_dp_dup(dp2);
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} else if (!dp2) {
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ret = efi_dp_dup(dp1);
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} else {
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/* both dp1 and dp2 are non-null */
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unsigned sz1 = efi_dp_size(dp1);
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unsigned sz2 = efi_dp_size(dp2);
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void *p = dp_alloc(sz1 + sz2 + sizeof(END));
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memcpy(p, dp1, sz1);
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memcpy(p + sz1, dp2, sz2);
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memcpy(p + sz1 + sz2, &END, sizeof(END));
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ret = p;
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}
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return ret;
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}
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struct efi_device_path *efi_dp_append_node(const struct efi_device_path *dp,
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const struct efi_device_path *node)
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{
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struct efi_device_path *ret;
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if (!node && !dp) {
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ret = efi_dp_dup(&END);
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} else if (!node) {
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ret = efi_dp_dup(dp);
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} else if (!dp) {
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unsigned sz = node->length;
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void *p = dp_alloc(sz + sizeof(END));
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memcpy(p, node, sz);
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memcpy(p + sz, &END, sizeof(END));
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ret = p;
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} else {
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/* both dp and node are non-null */
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unsigned sz = efi_dp_size(dp);
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void *p = dp_alloc(sz + node->length + sizeof(END));
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memcpy(p, dp, sz);
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memcpy(p + sz, node, node->length);
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memcpy(p + sz + node->length, &END, sizeof(END));
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ret = p;
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}
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return ret;
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}
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#ifdef CONFIG_DM
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/* size of device-path not including END node for device and all parents
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* up to the root device.
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*/
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static unsigned dp_size(struct udevice *dev)
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{
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if (!dev || !dev->driver)
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return sizeof(ROOT);
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switch (dev->driver->id) {
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case UCLASS_ROOT:
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case UCLASS_SIMPLE_BUS:
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/* stop traversing parents at this point: */
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return sizeof(ROOT);
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case UCLASS_MMC:
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return dp_size(dev->parent) +
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sizeof(struct efi_device_path_sd_mmc_path);
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case UCLASS_MASS_STORAGE:
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case UCLASS_USB_HUB:
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return dp_size(dev->parent) +
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sizeof(struct efi_device_path_usb_class);
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default:
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/* just skip over unknown classes: */
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return dp_size(dev->parent);
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}
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}
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static void *dp_fill(void *buf, struct udevice *dev)
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{
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if (!dev || !dev->driver)
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return buf;
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switch (dev->driver->id) {
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case UCLASS_ROOT:
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case UCLASS_SIMPLE_BUS: {
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/* stop traversing parents at this point: */
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struct efi_device_path_vendor *vdp = buf;
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*vdp = ROOT;
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return &vdp[1];
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}
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#if defined(CONFIG_DM_MMC) && defined(CONFIG_MMC)
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case UCLASS_MMC: {
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struct efi_device_path_sd_mmc_path *sddp =
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dp_fill(buf, dev->parent);
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struct mmc *mmc = mmc_get_mmc_dev(dev);
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struct blk_desc *desc = mmc_get_blk_desc(mmc);
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sddp->dp.type = DEVICE_PATH_TYPE_MESSAGING_DEVICE;
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sddp->dp.sub_type = (desc->if_type == IF_TYPE_MMC) ?
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DEVICE_PATH_SUB_TYPE_MSG_MMC :
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DEVICE_PATH_SUB_TYPE_MSG_SD;
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sddp->dp.length = sizeof(*sddp);
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sddp->slot_number = dev->seq;
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return &sddp[1];
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}
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#endif
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case UCLASS_MASS_STORAGE:
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case UCLASS_USB_HUB: {
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struct efi_device_path_usb_class *udp =
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dp_fill(buf, dev->parent);
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struct usb_device *udev = dev_get_parent_priv(dev);
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struct usb_device_descriptor *desc = &udev->descriptor;
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udp->dp.type = DEVICE_PATH_TYPE_MESSAGING_DEVICE;
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udp->dp.sub_type = DEVICE_PATH_SUB_TYPE_MSG_USB_CLASS;
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udp->dp.length = sizeof(*udp);
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udp->vendor_id = desc->idVendor;
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udp->product_id = desc->idProduct;
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udp->device_class = desc->bDeviceClass;
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udp->device_subclass = desc->bDeviceSubClass;
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udp->device_protocol = desc->bDeviceProtocol;
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return &udp[1];
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}
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default:
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debug("unhandled device class: %s (%u)\n",
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dev->name, dev->driver->id);
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return dp_fill(buf, dev->parent);
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}
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}
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/* Construct a device-path from a device: */
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struct efi_device_path *efi_dp_from_dev(struct udevice *dev)
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{
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void *buf, *start;
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start = buf = dp_alloc(dp_size(dev) + sizeof(END));
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buf = dp_fill(buf, dev);
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*((struct efi_device_path *)buf) = END;
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return start;
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}
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#endif
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static unsigned dp_part_size(struct blk_desc *desc, int part)
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{
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unsigned dpsize;
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#ifdef CONFIG_BLK
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dpsize = dp_size(desc->bdev->parent);
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#else
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dpsize = sizeof(ROOT) + sizeof(struct efi_device_path_usb);
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#endif
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if (part == 0) /* the actual disk, not a partition */
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return dpsize;
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if (desc->part_type == PART_TYPE_ISO)
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dpsize += sizeof(struct efi_device_path_cdrom_path);
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else
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dpsize += sizeof(struct efi_device_path_hard_drive_path);
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return dpsize;
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}
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static void *dp_part_fill(void *buf, struct blk_desc *desc, int part)
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{
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disk_partition_t info;
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#ifdef CONFIG_BLK
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buf = dp_fill(buf, desc->bdev->parent);
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#else
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/*
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* We *could* make a more accurate path, by looking at if_type
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* and handling all the different cases like we do for non-
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* legacy (ie CONFIG_BLK=y) case. But most important thing
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* is just to have a unique device-path for if_type+devnum.
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* So map things to a fictional USB device:
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*/
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struct efi_device_path_usb *udp;
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memcpy(buf, &ROOT, sizeof(ROOT));
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buf += sizeof(ROOT);
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udp = buf;
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udp->dp.type = DEVICE_PATH_TYPE_MESSAGING_DEVICE;
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udp->dp.sub_type = DEVICE_PATH_SUB_TYPE_MSG_USB;
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udp->dp.length = sizeof(*udp);
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udp->parent_port_number = desc->if_type;
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udp->usb_interface = desc->devnum;
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buf = &udp[1];
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#endif
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if (part == 0) /* the actual disk, not a partition */
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return buf;
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part_get_info(desc, part, &info);
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if (desc->part_type == PART_TYPE_ISO) {
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struct efi_device_path_cdrom_path *cddp = buf;
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cddp->boot_entry = part - 1;
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cddp->dp.type = DEVICE_PATH_TYPE_MEDIA_DEVICE;
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cddp->dp.sub_type = DEVICE_PATH_SUB_TYPE_CDROM_PATH;
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cddp->dp.length = sizeof(*cddp);
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cddp->partition_start = info.start;
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cddp->partition_end = info.size;
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buf = &cddp[1];
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} else {
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struct efi_device_path_hard_drive_path *hddp = buf;
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hddp->dp.type = DEVICE_PATH_TYPE_MEDIA_DEVICE;
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hddp->dp.sub_type = DEVICE_PATH_SUB_TYPE_HARD_DRIVE_PATH;
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hddp->dp.length = sizeof(*hddp);
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hddp->partition_number = part - 1;
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hddp->partition_start = info.start;
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hddp->partition_end = info.size;
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if (desc->part_type == PART_TYPE_EFI)
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hddp->partmap_type = 2;
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else
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hddp->partmap_type = 1;
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hddp->signature_type = desc->sig_type;
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if (hddp->signature_type != 0)
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memcpy(hddp->partition_signature, &desc->guid_sig,
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sizeof(hddp->partition_signature));
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buf = &hddp[1];
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}
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return buf;
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}
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/* Construct a device-path from a partition on a blk device: */
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struct efi_device_path *efi_dp_from_part(struct blk_desc *desc, int part)
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{
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void *buf, *start;
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start = buf = dp_alloc(dp_part_size(desc, part) + sizeof(END));
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buf = dp_part_fill(buf, desc, part);
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*((struct efi_device_path *)buf) = END;
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return start;
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}
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/* convert path to an UEFI style path (ie. DOS style backslashes and utf16) */
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static void path_to_uefi(u16 *uefi, const char *path)
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{
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while (*path) {
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char c = *(path++);
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if (c == '/')
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c = '\\';
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*(uefi++) = c;
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}
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*uefi = '\0';
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}
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/*
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* If desc is NULL, this creates a path with only the file component,
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* otherwise it creates a full path with both device and file components
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*/
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struct efi_device_path *efi_dp_from_file(struct blk_desc *desc, int part,
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const char *path)
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{
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struct efi_device_path_file_path *fp;
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void *buf, *start;
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unsigned dpsize = 0, fpsize;
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if (desc)
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dpsize = dp_part_size(desc, part);
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fpsize = sizeof(struct efi_device_path) + 2 * (strlen(path) + 1);
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dpsize += fpsize;
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start = buf = dp_alloc(dpsize + sizeof(END));
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if (desc)
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buf = dp_part_fill(buf, desc, part);
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/* add file-path: */
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fp = buf;
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fp->dp.type = DEVICE_PATH_TYPE_MEDIA_DEVICE;
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fp->dp.sub_type = DEVICE_PATH_SUB_TYPE_FILE_PATH;
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fp->dp.length = fpsize;
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path_to_uefi(fp->str, path);
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buf += fpsize;
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*((struct efi_device_path *)buf) = END;
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return start;
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}
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#ifdef CONFIG_NET
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struct efi_device_path *efi_dp_from_eth(void)
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{
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struct efi_device_path_mac_addr *ndp;
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void *buf, *start;
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unsigned dpsize = 0;
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assert(eth_get_dev());
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#ifdef CONFIG_DM_ETH
|
|
dpsize += dp_size(eth_get_dev());
|
|
#else
|
|
dpsize += sizeof(ROOT);
|
|
#endif
|
|
dpsize += sizeof(*ndp);
|
|
|
|
start = buf = dp_alloc(dpsize + sizeof(END));
|
|
|
|
#ifdef CONFIG_DM_ETH
|
|
buf = dp_fill(buf, eth_get_dev());
|
|
#else
|
|
memcpy(buf, &ROOT, sizeof(ROOT));
|
|
buf += sizeof(ROOT);
|
|
#endif
|
|
|
|
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);
|
|
memcpy(ndp->mac.addr, eth_get_ethaddr(), ARP_HLEN);
|
|
buf = &ndp[1];
|
|
|
|
*((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));
|
|
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* Helper to split a full device path (containing both device and file
|
|
* parts) into it's constituent parts.
|
|
*/
|
|
void 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;
|
|
|
|
dp = efi_dp_dup(full_path);
|
|
p = dp;
|
|
while (!EFI_DP_TYPE(p, MEDIA_DEVICE, FILE_PATH))
|
|
p = efi_dp_next(p);
|
|
fp = efi_dp_dup(p);
|
|
|
|
p->type = DEVICE_PATH_TYPE_END;
|
|
p->sub_type = DEVICE_PATH_SUB_TYPE_END;
|
|
p->length = sizeof(*p);
|
|
|
|
*device_path = dp;
|
|
*file_path = fp;
|
|
}
|