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efi_loader: helper functions for protocol management 

This patch provides helper functions to manage protocols.
efi_search_protocol - find a protocol on a handle
efi_add_protocol - install a protocol on a handle
efi_remove_protocol - remove a protocol from a handle
efi_remove_all_protocols - remove all protocols from a handle

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Heinrich Schuchardt 2017-10-26 19:25:53 +02:00 committed by Alexander Graf
parent 49d62cb093
commit 3f79a2b532
2 changed files with 131 additions and 0 deletions
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12
include/efi_loader.h
View File

@ -196,6 +196,18 @@ void efi_set_bootdev(const char *dev, const char *devnr, const char *path);
efi_status_t efi_create_handle(void **handle);
/* Call this to validate a handle and find the EFI object for it */
struct efi_object *efi_search_obj(const void *handle);
/* Find a protocol on a handle */
efi_status_t efi_search_protocol(const void *handle,
const efi_guid_t *protocol_guid,
struct efi_handler **handler);
/* Install new protocol on a handle */
efi_status_t efi_add_protocol(const void *handle, const efi_guid_t *protocol,
void *protocol_interface);
/* Delete protocol from a handle */
efi_status_t efi_remove_protocol(const void *handle, const efi_guid_t *protocol,
void *protocol_interface);
/* Delete all protocols from a handle */
efi_status_t efi_remove_all_protocols(const void *handle);
/* Call this to create an event */
efi_status_t efi_create_event(uint32_t type, efi_uintn_t notify_tpl,
void (EFIAPI *notify_function) (

119
lib/efi_loader/efi_boottime.c
View File

@ -702,6 +702,125 @@ struct efi_object *efi_search_obj(const void *handle)
return NULL;
}
/*
* Find a protocol on a handle.
*
* @handle handle
* @protocol_guid GUID of the protocol
* @handler reference to the protocol
* @return status code
*/
efi_status_t efi_search_protocol(const void *handle,
const efi_guid_t *protocol_guid,
struct efi_handler **handler)
{
struct efi_object *efiobj;
size_t i;
struct efi_handler *protocol;
if (!handle || !protocol_guid)
return EFI_INVALID_PARAMETER;
efiobj = efi_search_obj(handle);
if (!efiobj)
return EFI_INVALID_PARAMETER;
for (i = 0; i < ARRAY_SIZE(efiobj->protocols); i++) {
protocol = &efiobj->protocols[i];
if (!protocol->guid)
continue;
if (!guidcmp(protocol->guid, protocol_guid)) {
if (handler)
*handler = protocol;
return EFI_SUCCESS;
}
}
return EFI_NOT_FOUND;
}
/*
* Install new protocol on a handle.
*
* @handle handle on which the protocol shall be installed
* @protocol GUID of the protocol to be installed
* @protocol_interface interface of the protocol implementation
* @return status code
*/
efi_status_t efi_add_protocol(const void *handle, const efi_guid_t *protocol,
void *protocol_interface)
{
struct efi_object *efiobj;
struct efi_handler *handler;
efi_status_t ret;
size_t i;
efiobj = efi_search_obj(handle);
if (!efiobj)
return EFI_INVALID_PARAMETER;
ret = efi_search_protocol(handle, protocol, NULL);
if (ret != EFI_NOT_FOUND)
return EFI_INVALID_PARAMETER;
handler = calloc(1, sizeof(struct efi_handler));
if (!handler)
return EFI_OUT_OF_RESOURCES;
/* Install protocol in first empty slot. */
for (i = 0; i < ARRAY_SIZE(efiobj->protocols); i++) {
handler = &efiobj->protocols[i];
if (handler->guid)
continue;
handler->guid = protocol;
handler->protocol_interface = protocol_interface;
return EFI_SUCCESS;
}
return EFI_OUT_OF_RESOURCES;
}
/*
* Delete protocol from a handle.
*
* @handle handle from which the protocol shall be deleted
* @protocol GUID of the protocol to be deleted
* @protocol_interface interface of the protocol implementation
* @return status code
*/
efi_status_t efi_remove_protocol(const void *handle, const efi_guid_t *protocol,
void *protocol_interface)
{
struct efi_handler *handler;
efi_status_t ret;
ret = efi_search_protocol(handle, protocol, &handler);
if (ret != EFI_SUCCESS)
return ret;
if (handler->protocol_interface != protocol_interface)
return EFI_NOT_FOUND;
handler->guid = NULL;
handler->protocol_interface = NULL;
return EFI_SUCCESS;
}
/*
* Delete all protocols from a handle.
*
* @handle handle from which the protocols shall be deleted
* @return status code
*/
efi_status_t efi_remove_all_protocols(const void *handle)
{
struct efi_object *efiobj;
struct efi_handler *handler;
size_t i;
efiobj = efi_search_obj(handle);
if (!efiobj)
return EFI_INVALID_PARAMETER;
for (i = 0; i < ARRAY_SIZE(efiobj->protocols); i++) {
handler = &efiobj->protocols[i];
handler->guid = NULL;
handler->protocol_interface = NULL;
}
return EFI_SUCCESS;
}
/*
* Install protocol interface.
*