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-rw-r--r--drivers/firmware/efi/efi-stub-helper.c61
1 files changed, 61 insertions, 0 deletions
diff --git a/drivers/firmware/efi/efi-stub-helper.c b/drivers/firmware/efi/efi-stub-helper.c
index 361e24d..96665b7 100644
--- a/drivers/firmware/efi/efi-stub-helper.c
+++ b/drivers/firmware/efi/efi-stub-helper.c
@@ -554,3 +554,64 @@ static efi_status_t efi_relocate_kernel(efi_system_table_t *sys_table_arg,
return status;
}
+
+/*
+ * Convert the unicode UEFI command line to ASCII to pass to kernel.
+ * Size of memory allocated return in *cmd_line_len.
+ * Returns NULL on error.
+ */
+static char *efi_convert_cmdline_to_ascii(efi_system_table_t *sys_table_arg,
+ efi_loaded_image_t *image,
+ int *cmd_line_len)
+{
+ u16 *s2;
+ u8 *s1 = NULL;
+ unsigned long cmdline_addr = 0;
+ int load_options_size = image->load_options_size / 2; /* ASCII */
+ void *options = image->load_options;
+ int options_size = 0;
+ efi_status_t status;
+ int i;
+ u16 zero = 0;
+
+ if (options) {
+ s2 = options;
+ while (*s2 && *s2 != '\n' && options_size < load_options_size) {
+ s2++;
+ options_size++;
+ }
+ }
+
+ if (options_size == 0) {
+ /* No command line options, so return empty string*/
+ options_size = 1;
+ options = &zero;
+ }
+
+ options_size++; /* NUL termination */
+#ifdef CONFIG_ARM
+ /*
+ * For ARM, allocate at a high address to avoid reserved
+ * regions at low addresses that we don't know the specfics of
+ * at the time we are processing the command line.
+ */
+ status = efi_high_alloc(sys_table_arg, options_size, 0,
+ &cmdline_addr, 0xfffff000);
+#else
+ status = efi_low_alloc(sys_table_arg, options_size, 0,
+ &cmdline_addr);
+#endif
+ if (status != EFI_SUCCESS)
+ return NULL;
+
+ s1 = (u8 *)cmdline_addr;
+ s2 = (u16 *)options;
+
+ for (i = 0; i < options_size - 1; i++)
+ *s1++ = *s2++;
+
+ *s1 = '\0';
+
+ *cmd_line_len = options_size;
+ return (char *)cmdline_addr;
+}
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