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efi_loader: implement OpenProtocolInformation

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efi_open_protocol_information provides the agent and controller
handles as well as the attributes and open count of an protocol
on a handle.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
[agraf: fix counting error]
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Heinrich Schuchardt 2018-01-11 08:16:00 +01:00 committed by Alexander Graf
parent 3b8a489c9f
commit e3fbbc36f2
1 changed files with 41 additions and 1 deletions
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42
lib/efi_loader/efi_boottime.c
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@ -1742,9 +1742,49 @@ static efi_status_t EFIAPI efi_open_protocol_information(efi_handle_t handle,
struct efi_open_protocol_info_entry **entry_buffer,
efi_uintn_t *entry_count)
{
unsigned long buffer_size;
unsigned long count;
struct efi_handler *handler;
struct efi_open_protocol_info_item *item;
efi_status_t r;
EFI_ENTRY("%p, %pUl, %p, %p", handle, protocol, entry_buffer,
entry_count);
return EFI_EXIT(EFI_NOT_FOUND);
/* Check parameters */
if (!entry_buffer) {
r = EFI_INVALID_PARAMETER;
goto out;
}
r = efi_search_protocol(handle, protocol, &handler);
if (r != EFI_SUCCESS)
goto out;
/* Count entries */
count = 0;
list_for_each_entry(item, &handler->open_infos, link) {
if (item->info.open_count)
++count;
}
*entry_count = count;
*entry_buffer = NULL;
if (!count) {
r = EFI_SUCCESS;
goto out;
}
/* Copy entries */
buffer_size = count * sizeof(struct efi_open_protocol_info_entry);
r = efi_allocate_pool(EFI_ALLOCATE_ANY_PAGES, buffer_size,
(void **)entry_buffer);
if (r != EFI_SUCCESS)
goto out;
list_for_each_entry_reverse(item, &handler->open_infos, link) {
if (item->info.open_count)
(*entry_buffer)[--count] = item->info;
}
out:
return EFI_EXIT(r);
}
/*