GK SDK 源码库: XMIPCLinuxV100R005C00SPC030 (kernel/tools/open_source excluded)
This commit is contained in:
@@ -0,0 +1,347 @@
|
||||
// SPDX-License-Identifier: GPL-2.0+
|
||||
/*
|
||||
* Uclass for EFI drivers
|
||||
*
|
||||
* Copyright (c) 2017 Heinrich Schuchardt
|
||||
*
|
||||
* For each EFI driver the uclass
|
||||
* - creates a handle
|
||||
* - installs the driver binding protocol
|
||||
*
|
||||
* The uclass provides the bind, start, and stop entry points for the driver
|
||||
* binding protocol.
|
||||
*
|
||||
* In bind() and stop() it checks if the controller implements the protocol
|
||||
* supported by the EFI driver. In the start() function it calls the bind()
|
||||
* function of the EFI driver. In the stop() function it destroys the child
|
||||
* controllers.
|
||||
*/
|
||||
|
||||
#include <efi_driver.h>
|
||||
|
||||
/**
|
||||
* check_node_type() - check node type
|
||||
*
|
||||
* We do not support partitions as controller handles.
|
||||
*
|
||||
* @handle: handle to be checked
|
||||
* Return: status code
|
||||
*/
|
||||
static efi_status_t check_node_type(efi_handle_t handle)
|
||||
{
|
||||
efi_status_t r, ret = EFI_SUCCESS;
|
||||
const struct efi_device_path *dp;
|
||||
|
||||
/* Open the device path protocol */
|
||||
r = EFI_CALL(systab.boottime->open_protocol(
|
||||
handle, &efi_guid_device_path, (void **)&dp,
|
||||
NULL, NULL, EFI_OPEN_PROTOCOL_GET_PROTOCOL));
|
||||
if (r == EFI_SUCCESS && dp) {
|
||||
/* Get the last node */
|
||||
const struct efi_device_path *node = efi_dp_last_node(dp);
|
||||
/* We do not support partitions as controller */
|
||||
if (!node || node->type == DEVICE_PATH_TYPE_MEDIA_DEVICE)
|
||||
ret = EFI_UNSUPPORTED;
|
||||
}
|
||||
return ret;
|
||||
}
|
||||
|
||||
/**
|
||||
* efi_uc_supported() - check if the driver supports the controller
|
||||
*
|
||||
* @this: driver binding protocol
|
||||
* @controller_handle: handle of the controller
|
||||
* @remaining_device_path: path specifying the child controller
|
||||
* Return: status code
|
||||
*/
|
||||
static efi_status_t EFIAPI efi_uc_supported(
|
||||
struct efi_driver_binding_protocol *this,
|
||||
efi_handle_t controller_handle,
|
||||
struct efi_device_path *remaining_device_path)
|
||||
{
|
||||
efi_status_t r, ret;
|
||||
void *interface;
|
||||
struct efi_driver_binding_extended_protocol *bp =
|
||||
(struct efi_driver_binding_extended_protocol *)this;
|
||||
|
||||
EFI_ENTRY("%p, %p, %ls", this, controller_handle,
|
||||
efi_dp_str(remaining_device_path));
|
||||
|
||||
ret = EFI_CALL(systab.boottime->open_protocol(
|
||||
controller_handle, bp->ops->protocol,
|
||||
&interface, this->driver_binding_handle,
|
||||
controller_handle, EFI_OPEN_PROTOCOL_BY_DRIVER));
|
||||
switch (ret) {
|
||||
case EFI_ACCESS_DENIED:
|
||||
case EFI_ALREADY_STARTED:
|
||||
goto out;
|
||||
case EFI_SUCCESS:
|
||||
break;
|
||||
default:
|
||||
ret = EFI_UNSUPPORTED;
|
||||
goto out;
|
||||
}
|
||||
|
||||
ret = check_node_type(controller_handle);
|
||||
|
||||
r = EFI_CALL(systab.boottime->close_protocol(
|
||||
controller_handle, bp->ops->protocol,
|
||||
this->driver_binding_handle,
|
||||
controller_handle));
|
||||
if (r != EFI_SUCCESS)
|
||||
ret = EFI_UNSUPPORTED;
|
||||
out:
|
||||
return EFI_EXIT(ret);
|
||||
}
|
||||
|
||||
/**
|
||||
* efi_uc_start() - create child controllers and attach driver
|
||||
*
|
||||
* @this: driver binding protocol
|
||||
* @controller_handle: handle of the controller
|
||||
* @remaining_device_path: path specifying the child controller
|
||||
* Return: status code
|
||||
*/
|
||||
static efi_status_t EFIAPI efi_uc_start(
|
||||
struct efi_driver_binding_protocol *this,
|
||||
efi_handle_t controller_handle,
|
||||
struct efi_device_path *remaining_device_path)
|
||||
{
|
||||
efi_status_t r, ret;
|
||||
void *interface = NULL;
|
||||
struct efi_driver_binding_extended_protocol *bp =
|
||||
(struct efi_driver_binding_extended_protocol *)this;
|
||||
|
||||
EFI_ENTRY("%p, %pUl, %ls", this, controller_handle,
|
||||
efi_dp_str(remaining_device_path));
|
||||
|
||||
/* Attach driver to controller */
|
||||
ret = EFI_CALL(systab.boottime->open_protocol(
|
||||
controller_handle, bp->ops->protocol,
|
||||
&interface, this->driver_binding_handle,
|
||||
controller_handle, EFI_OPEN_PROTOCOL_BY_DRIVER));
|
||||
switch (ret) {
|
||||
case EFI_ACCESS_DENIED:
|
||||
case EFI_ALREADY_STARTED:
|
||||
goto out;
|
||||
case EFI_SUCCESS:
|
||||
break;
|
||||
default:
|
||||
ret = EFI_UNSUPPORTED;
|
||||
goto out;
|
||||
}
|
||||
ret = check_node_type(controller_handle);
|
||||
if (ret != EFI_SUCCESS) {
|
||||
r = EFI_CALL(systab.boottime->close_protocol(
|
||||
controller_handle, bp->ops->protocol,
|
||||
this->driver_binding_handle,
|
||||
controller_handle));
|
||||
if (r != EFI_SUCCESS)
|
||||
EFI_PRINT("Failure to close handle\n");
|
||||
goto out;
|
||||
}
|
||||
|
||||
/* TODO: driver specific stuff */
|
||||
bp->ops->bind(controller_handle, interface);
|
||||
|
||||
out:
|
||||
return EFI_EXIT(ret);
|
||||
}
|
||||
|
||||
/**
|
||||
* disconnect_child() - remove a single child controller from the parent
|
||||
* controller
|
||||
*
|
||||
* @controller_handle: parent controller
|
||||
* @child_handle: child controller
|
||||
* Return: status code
|
||||
*/
|
||||
static efi_status_t disconnect_child(efi_handle_t controller_handle,
|
||||
efi_handle_t child_handle)
|
||||
{
|
||||
efi_status_t ret;
|
||||
efi_guid_t *guid_controller = NULL;
|
||||
efi_guid_t *guid_child_controller = NULL;
|
||||
|
||||
ret = EFI_CALL(systab.boottime->close_protocol(
|
||||
controller_handle, guid_controller,
|
||||
child_handle, child_handle));
|
||||
if (ret != EFI_SUCCESS) {
|
||||
EFI_PRINT("Cannot close protocol\n");
|
||||
return ret;
|
||||
}
|
||||
ret = EFI_CALL(systab.boottime->uninstall_protocol_interface(
|
||||
child_handle, guid_child_controller, NULL));
|
||||
if (ret != EFI_SUCCESS) {
|
||||
EFI_PRINT("Cannot uninstall protocol interface\n");
|
||||
return ret;
|
||||
}
|
||||
return ret;
|
||||
}
|
||||
|
||||
/**
|
||||
* efi_uc_stop() - Remove child controllers and disconnect the controller
|
||||
*
|
||||
* @this: driver binding protocol
|
||||
* @controller_handle: handle of the controller
|
||||
* @number_of_children: number of child controllers to remove
|
||||
* @child_handle_buffer: handles of the child controllers to remove
|
||||
* Return: status code
|
||||
*/
|
||||
static efi_status_t EFIAPI efi_uc_stop(
|
||||
struct efi_driver_binding_protocol *this,
|
||||
efi_handle_t controller_handle,
|
||||
size_t number_of_children,
|
||||
efi_handle_t *child_handle_buffer)
|
||||
{
|
||||
efi_status_t ret;
|
||||
efi_uintn_t count;
|
||||
struct efi_open_protocol_info_entry *entry_buffer;
|
||||
efi_guid_t *guid_controller = NULL;
|
||||
|
||||
EFI_ENTRY("%p, %pUl, %zu, %p", this, controller_handle,
|
||||
number_of_children, child_handle_buffer);
|
||||
|
||||
/* Destroy provided child controllers */
|
||||
if (number_of_children) {
|
||||
efi_uintn_t i;
|
||||
|
||||
for (i = 0; i < number_of_children; ++i) {
|
||||
ret = disconnect_child(controller_handle,
|
||||
child_handle_buffer[i]);
|
||||
if (ret != EFI_SUCCESS)
|
||||
return ret;
|
||||
}
|
||||
return EFI_SUCCESS;
|
||||
}
|
||||
|
||||
/* Destroy all children */
|
||||
ret = EFI_CALL(systab.boottime->open_protocol_information(
|
||||
controller_handle, guid_controller,
|
||||
&entry_buffer, &count));
|
||||
if (ret != EFI_SUCCESS)
|
||||
goto out;
|
||||
while (count) {
|
||||
if (entry_buffer[--count].attributes &
|
||||
EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER) {
|
||||
ret = disconnect_child(
|
||||
controller_handle,
|
||||
entry_buffer[count].agent_handle);
|
||||
if (ret != EFI_SUCCESS)
|
||||
goto out;
|
||||
}
|
||||
}
|
||||
ret = EFI_CALL(systab.boottime->free_pool(entry_buffer));
|
||||
if (ret != EFI_SUCCESS)
|
||||
printf("%s: ERROR: Cannot free pool\n", __func__);
|
||||
|
||||
/* Detach driver from controller */
|
||||
ret = EFI_CALL(systab.boottime->close_protocol(
|
||||
controller_handle, guid_controller,
|
||||
this->driver_binding_handle, controller_handle));
|
||||
out:
|
||||
return EFI_EXIT(ret);
|
||||
}
|
||||
|
||||
/**
|
||||
* efi_add_driver() - add driver
|
||||
*
|
||||
* @drv: driver to add
|
||||
* Return: status code
|
||||
*/
|
||||
static efi_status_t efi_add_driver(struct driver *drv)
|
||||
{
|
||||
efi_status_t ret;
|
||||
const struct efi_driver_ops *ops = drv->ops;
|
||||
struct efi_driver_binding_extended_protocol *bp;
|
||||
|
||||
debug("EFI: Adding driver '%s'\n", drv->name);
|
||||
if (!ops->protocol) {
|
||||
printf("EFI: ERROR: protocol GUID missing for driver '%s'\n",
|
||||
drv->name);
|
||||
return EFI_INVALID_PARAMETER;
|
||||
}
|
||||
bp = calloc(1, sizeof(struct efi_driver_binding_extended_protocol));
|
||||
if (!bp)
|
||||
return EFI_OUT_OF_RESOURCES;
|
||||
|
||||
bp->bp.supported = efi_uc_supported;
|
||||
bp->bp.start = efi_uc_start;
|
||||
bp->bp.stop = efi_uc_stop;
|
||||
bp->bp.version = 0xffffffff;
|
||||
bp->ops = drv->ops;
|
||||
|
||||
ret = efi_create_handle(&bp->bp.driver_binding_handle);
|
||||
if (ret != EFI_SUCCESS) {
|
||||
free(bp);
|
||||
goto out;
|
||||
}
|
||||
bp->bp.image_handle = bp->bp.driver_binding_handle;
|
||||
ret = efi_add_protocol(bp->bp.driver_binding_handle,
|
||||
&efi_guid_driver_binding_protocol, bp);
|
||||
if (ret != EFI_SUCCESS) {
|
||||
efi_delete_handle(bp->bp.driver_binding_handle);
|
||||
free(bp);
|
||||
goto out;
|
||||
}
|
||||
out:
|
||||
return ret;
|
||||
}
|
||||
|
||||
/**
|
||||
* efi_driver_init() - initialize the EFI drivers
|
||||
*
|
||||
* Called by efi_init_obj_list().
|
||||
*
|
||||
* Return: 0 = success, any other value will stop further execution
|
||||
*/
|
||||
efi_status_t efi_driver_init(void)
|
||||
{
|
||||
struct driver *drv;
|
||||
efi_status_t ret = EFI_SUCCESS;
|
||||
|
||||
debug("EFI: Initializing EFI driver framework\n");
|
||||
for (drv = ll_entry_start(struct driver, driver);
|
||||
drv < ll_entry_end(struct driver, driver); ++drv) {
|
||||
if (drv->id == UCLASS_EFI) {
|
||||
ret = efi_add_driver(drv);
|
||||
if (ret != EFI_SUCCESS) {
|
||||
printf("EFI: ERROR: failed to add driver %s\n",
|
||||
drv->name);
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
return ret;
|
||||
}
|
||||
|
||||
/**
|
||||
* efi_uc_init() - initialize the EFI uclass
|
||||
*
|
||||
* @class: the EFI uclass
|
||||
* Return: 0 = success
|
||||
*/
|
||||
static int efi_uc_init(struct uclass *class)
|
||||
{
|
||||
printf("EFI: Initializing UCLASS_EFI\n");
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* efi_uc_destroy() - destroy the EFI uclass
|
||||
*
|
||||
* @class: the EFI uclass
|
||||
* Return: 0 = success
|
||||
*/
|
||||
static int efi_uc_destroy(struct uclass *class)
|
||||
{
|
||||
printf("Destroying UCLASS_EFI\n");
|
||||
return 0;
|
||||
}
|
||||
|
||||
UCLASS_DRIVER(efi) = {
|
||||
.name = "efi",
|
||||
.id = UCLASS_EFI,
|
||||
.init = efi_uc_init,
|
||||
.destroy = efi_uc_destroy,
|
||||
};
|
||||
Reference in New Issue
Block a user