Add an EFI stub helper function to retrieve the EFI command line using
the LOADED_IMAGE_PROTOCOL, and convert it to ASCII. This function will
be shared by the various EFI stub implementations.
Signed-off-by: Roy Franz <roy.franz@xxxxxxxxxx>
---
drivers/firmware/efi/efi-stub-helper.c | 30 ++++++++++++++++++++++++++++++
1 file changed, 30 insertions(+)
diff --git a/drivers/firmware/efi/efi-stub-helper.c b/drivers/firmware/efi/efi-stub-helper.c
index eb5d2eb..f657456 100644
--- a/drivers/firmware/efi/efi-stub-helper.c
+++ b/drivers/firmware/efi/efi-stub-helper.c
@@ -637,3 +637,33 @@ static char *efi_convert_cmdline_to_ascii(efi_system_table_t *sys_table_arg,
*cmd_line_len = options_size;
return (char *)cmdline_addr;
}
+
+/*
+ * get the command line from EFI, using the LOADED_IMAGE
+ * protocol, and convert to ASCII.
+ *
+ */
+static void efi_get_cmdline(efi_system_table_t *sys_table,
+ efi_loaded_image_t **image,
+ void *handle, char **cmdline_ptr)
+{
+ efi_guid_t proto = LOADED_IMAGE_PROTOCOL_GUID;
+ efi_status_t status;
+ int cmdline_size;
+
+ status = efi_call_phys3(sys_table->boottime->handle_protocol,
+ handle, &proto, (void *)image);
+ if (status != EFI_SUCCESS) {
+ pr_efi_err(sys_table, "Failed to get handle for LOADED_IMAGE_PROTOCOL\n");
+ *cmdline_ptr = NULL;
+ return;
+ }
+
+ /*
+ * We are going to copy this into device tree, so we don't care where
+ * in memory it is.
+ */
+ *cmdline_ptr = efi_convert_cmdline_to_ascii(sys_table, *image,
+ &cmdline_size);
+
+}
--
1.7.10.4
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