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refactor(el3-spmc): add emad_advance()

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This will be needed later.

Change-Id: I396b5e1410268d98cf6bf00cd553a5d01123847c
Signed-off-by: Demi Marie Obenour <demiobenour@gmail.com>
This commit is contained in:
Demi Marie Obenour 2023-01-15 14:18:13 -05:00
parent dd94372d77
commit a0239da987
1 changed files with 15 additions and 15 deletions
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30
services/std_svc/spm/el3_spmc/spmc_shared_mem.c
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@ -760,6 +760,12 @@ spmc_validate_mtd_start(struct ffa_mtd *desc, uint32_t ffa_version,
return 0;
}
static inline const struct ffa_emad_v1_0 *
emad_advance(const struct ffa_emad_v1_0 *emad, size_t offset)
{
return (const struct ffa_emad_v1_0 *)((const uint8_t *)emad + offset);
}
/**
* spmc_shmem_check_obj - Check that counts in descriptor match overall size.
* @obj: Object containing ffa_memory_region_descriptor.
@ -771,7 +777,8 @@ spmc_validate_mtd_start(struct ffa_mtd *desc, uint32_t ffa_version,
static int spmc_shmem_check_obj(struct spmc_shmem_obj *obj,
uint32_t ffa_version)
{
const struct ffa_emad_v1_0 *emad;
const struct ffa_emad_v1_0 *first_emad;
const struct ffa_emad_v1_0 *end_emad;
size_t emad_size;
uint32_t comp_mrd_offset = 0;
@ -788,10 +795,14 @@ static int spmc_shmem_check_obj(struct spmc_shmem_obj *obj,
panic();
}
emad = spmc_shmem_obj_get_emad(&obj->desc, 0,
ffa_version, &emad_size);
first_emad = spmc_shmem_obj_get_emad(&obj->desc, 0,
ffa_version, &emad_size);
end_emad = emad_advance(first_emad, obj->desc.emad_count * emad_size);
for (size_t emad_num = 0; emad_num < obj->desc.emad_count; emad_num++) {
/* Loop through the endpoint descriptors, validating each of them. */
for (const struct ffa_emad_v1_0 *emad = first_emad;
emad < end_emad;
emad = emad_advance(emad, emad_size)) {
size_t size;
size_t count;
size_t expected_size;
@ -801,17 +812,6 @@ static int spmc_shmem_check_obj(struct spmc_shmem_obj *obj,
struct ffa_comp_mrd *comp;
ffa_endpoint_id16_t ep_id;
/*
* Validate the calculated emad address resides within the
* descriptor.
*/
if ((uintptr_t) emad >
((uintptr_t) &obj->desc + obj->desc_size - emad_size)) {
ERROR("BUG: Invalid emad access not detected earlier.\n");
panic();
}
emad = (const struct ffa_emad_v1_0 *)((const uint8_t *)emad + emad_size);
offset = emad->comp_mrd_offset;
/*