efi_loader: Enable run-time variable support for tee based variables
We recently added functions for storing/restoring variables
from a file to a memory backed buffer marked as __efi_runtime_data
commit f1f990a8c958 ("efi_loader: memory buffer for variables")
commit 5f7dcf079de8 ("efi_loader: UEFI variable persistence")
Using the same idea we now can support GetVariable() and GetNextVariable()
on the OP-TEE based variables as well.
So let's re-arrange the code a bit and move the commmon code for
accessing variables out of efi_variable.c. Create common functions for
reading variables from memory that both implementations can use on
run-time. Then just use those functions in the run-time variants of the
OP-TEE based EFI variable implementation and initialize the memory
buffer on ExitBootServices()
Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
diff --git a/lib/efi_loader/efi_variable.c b/lib/efi_loader/efi_variable.c
index 39a8482..e509d6d 100644
--- a/lib/efi_loader/efi_variable.c
+++ b/lib/efi_loader/efi_variable.c
@@ -282,68 +282,14 @@
u32 *attributes, efi_uintn_t *data_size, void *data,
u64 *timep)
{
- efi_uintn_t old_size;
- struct efi_var_entry *var;
- u16 *pdata;
-
- if (!variable_name || !vendor || !data_size)
- return EFI_INVALID_PARAMETER;
- var = efi_var_mem_find(vendor, variable_name, NULL);
- if (!var)
- return EFI_NOT_FOUND;
-
- if (attributes)
- *attributes = var->attr;
- if (timep)
- *timep = var->time;
-
- old_size = *data_size;
- *data_size = var->length;
- if (old_size < var->length)
- return EFI_BUFFER_TOO_SMALL;
-
- if (!data)
- return EFI_INVALID_PARAMETER;
-
- for (pdata = var->name; *pdata; ++pdata)
- ;
- ++pdata;
-
- efi_memcpy_runtime(data, pdata, var->length);
-
- return EFI_SUCCESS;
+ return efi_get_variable_mem(variable_name, vendor, attributes, data_size, data, timep);
}
efi_status_t __efi_runtime
efi_get_next_variable_name_int(efi_uintn_t *variable_name_size,
u16 *variable_name, efi_guid_t *vendor)
{
- struct efi_var_entry *var;
- efi_uintn_t old_size;
- u16 *pdata;
-
- if (!variable_name_size || !variable_name || !vendor)
- return EFI_INVALID_PARAMETER;
-
- efi_var_mem_find(vendor, variable_name, &var);
-
- if (!var)
- return EFI_NOT_FOUND;
-
- for (pdata = var->name; *pdata; ++pdata)
- ;
- ++pdata;
-
- old_size = *variable_name_size;
- *variable_name_size = (uintptr_t)pdata - (uintptr_t)var->name;
-
- if (old_size < *variable_name_size)
- return EFI_BUFFER_TOO_SMALL;
-
- efi_memcpy_runtime(variable_name, var->name, *variable_name_size);
- efi_memcpy_runtime(vendor, &var->guid, sizeof(efi_guid_t));
-
- return EFI_SUCCESS;
+ return efi_get_next_variable_name_mem(variable_name_size, variable_name, vendor);
}
efi_status_t efi_set_variable_int(u16 *variable_name, const efi_guid_t *vendor,
@@ -505,49 +451,6 @@
}
/**
- * efi_get_variable_runtime() - runtime implementation of GetVariable()
- *
- * @variable_name: name of the variable
- * @vendor: vendor GUID
- * @attributes: attributes of the variable
- * @data_size: size of the buffer to which the variable value is copied
- * @data: buffer to which the variable value is copied
- * Return: status code
- */
-static efi_status_t __efi_runtime EFIAPI
-efi_get_variable_runtime(u16 *variable_name, const efi_guid_t *vendor,
- u32 *attributes, efi_uintn_t *data_size, void *data)
-{
- efi_status_t ret;
-
- ret = efi_get_variable_int(variable_name, vendor, attributes,
- data_size, data, NULL);
-
- /* Remove EFI_VARIABLE_READ_ONLY flag */
- if (attributes)
- *attributes &= EFI_VARIABLE_MASK;
-
- return ret;
-}
-
-/**
- * efi_get_next_variable_name_runtime() - runtime implementation of
- * GetNextVariable()
- *
- * @variable_name_size: size of variable_name buffer in byte
- * @variable_name: name of uefi variable's name in u16
- * @vendor: vendor's guid
- * Return: status code
- */
-static efi_status_t __efi_runtime EFIAPI
-efi_get_next_variable_name_runtime(efi_uintn_t *variable_name_size,
- u16 *variable_name, efi_guid_t *vendor)
-{
- return efi_get_next_variable_name_int(variable_name_size, variable_name,
- vendor);
-}
-
-/**
* efi_set_variable_runtime() - runtime implementation of SetVariable()
*
* @variable_name: name of the variable