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fix(handoff): correct representation of tag_id

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The tag ID is a 3-byte field used to identify the contents of a TE. In
our library, the internal representation of the tag is a 2 byte field.
We currently ignore the top byte of this field, marking it res0. This
causes problems when dealing with non-standard TE types, whose range
starts at 0xff_f000.  This commit fixes this by using a bit-field with a
24-bit width, and packing `transfer_list_entry`.

Change-Id: Ib3c212f964b64f528ad6f3dd6ab8b4597b877cd9
Signed-off-by: Harrison Mutai <harrison.mutai@arm.com>
This commit is contained in:
Harrison Mutai 2024-03-20 14:37:51 +00:00
parent 42d4111dcf
commit d594ace68d
2 changed files with 12 additions and 14 deletions
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15
include/lib/transfer_list.h
View file

@ -1,5 +1,5 @@
/*
* Copyright (c) 2023, Linaro Limited and Contributors. All rights reserved.
* Copyright (c) 2023-2024, Linaro Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
@ -73,9 +73,8 @@ struct transfer_list_header {
*/
};
struct transfer_list_entry {
uint16_t tag_id;
uint8_t reserved0; /* place holder */
struct __attribute__((packed)) transfer_list_entry {
uint32_t tag_id : 24;
uint8_t hdr_size;
uint32_t data_size;
/*
@ -89,6 +88,8 @@ struct transfer_list_entry {
*/
};
CASSERT(sizeof(struct transfer_list_entry) == U(0x8), assert_transfer_list_entry_size);
void transfer_list_dump(struct transfer_list_header *tl);
entry_point_info_t *
transfer_list_set_handoff_args(struct transfer_list_header *tl,
@ -113,12 +114,12 @@ bool transfer_list_rem(struct transfer_list_header *tl,
struct transfer_list_entry *entry);
struct transfer_list_entry *transfer_list_add(struct transfer_list_header *tl,
uint16_t tag_id,
uint32_t tag_id,
uint32_t data_size,
const void *data);
struct transfer_list_entry *
transfer_list_add_with_align(struct transfer_list_header *tl, uint16_t tag_id,
transfer_list_add_with_align(struct transfer_list_header *tl, uint32_t tag_id,
uint32_t data_size, const void *data,
uint8_t alignment);
@ -127,7 +128,7 @@ transfer_list_next(struct transfer_list_header *tl,
struct transfer_list_entry *last);
struct transfer_list_entry *transfer_list_find(struct transfer_list_header *tl,
uint16_t tag_id);
uint32_t tag_id);
#endif /*__ASSEMBLER__*/
#endif /*__TRANSFER_LIST_H*/

11
lib/transfer_list/transfer_list.c
View file

@ -366,7 +366,6 @@ bool transfer_list_set_data_size(struct transfer_list_header *tl,
/* create a dummy TE to fill up the gap */
dummy_te = (struct transfer_list_entry *)new_ev;
dummy_te->tag_id = TL_TAG_EMPTY;
dummy_te->reserved0 = 0;
dummy_te->hdr_size = sizeof(*dummy_te);
dummy_te->data_size = gap - sizeof(*dummy_te);
}
@ -388,7 +387,6 @@ bool transfer_list_rem(struct transfer_list_header *tl,
return false;
}
te->tag_id = TL_TAG_EMPTY;
te->reserved0 = 0;
transfer_list_update_checksum(tl);
return true;
}
@ -399,7 +397,7 @@ bool transfer_list_rem(struct transfer_list_header *tl,
* Return pointer to the added transfer entry or NULL on error
******************************************************************************/
struct transfer_list_entry *transfer_list_add(struct transfer_list_header *tl,
uint16_t tag_id,
uint32_t tag_id,
uint32_t data_size,
const void *data)
{
@ -428,7 +426,6 @@ struct transfer_list_entry *transfer_list_add(struct transfer_list_header *tl,
te = (struct transfer_list_entry *)tl_ev;
te->tag_id = tag_id;
te->reserved0 = 0;
te->hdr_size = sizeof(*te);
te->data_size = data_size;
tl->size += ev - tl_ev;
@ -454,7 +451,7 @@ struct transfer_list_entry *transfer_list_add(struct transfer_list_header *tl,
* Return pointer to the added transfer entry or NULL on error
******************************************************************************/
struct transfer_list_entry *
transfer_list_add_with_align(struct transfer_list_header *tl, uint16_t tag_id,
transfer_list_add_with_align(struct transfer_list_header *tl, uint32_t tag_id,
uint32_t data_size, const void *data,
uint8_t alignment)
{
@ -501,13 +498,13 @@ transfer_list_add_with_align(struct transfer_list_header *tl, uint16_t tag_id,
* Return pointer to the found transfer entry or NULL on error
******************************************************************************/
struct transfer_list_entry *transfer_list_find(struct transfer_list_header *tl,
uint16_t tag_id)
uint32_t tag_id)
{
struct transfer_list_entry *te = NULL;
do {
te = transfer_list_next(tl, te);
} while (te && (te->tag_id != tag_id || te->reserved0 != 0));
} while (te && (te->tag_id != tag_id));
return te;
}