efi: Move unicode to ASCII conversion to shared function.

Move the open-coded conversion to a shared function for
use by all architectures.  Change the allocation to prefer
a high address for ARM, as this is required to avoid conflicts
with reserved regions in low memory.  We don't know the specifics
of these regions until after we process the command line and
device tree.

Signed-off-by: Roy Franz <roy.franz@linaro.org>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>

1 files changed, 6 insertions, 37 deletions

diff --git a/arch/x86/boot/compressed/eboot.c b/arch/x86/boot/compressed/eboot.c
index 2e997b6fbdb1..5e708c0d466f 100644
--- a/arch/x86/boot/compressed/eboot.c
+++ b/arch/x86/boot/compressed/eboot.c
@@ -435,11 +435,10 @@ struct boot_params *make_boot_params(void *handle, efi_system_table_t *_table)
         struct efi_info *efi;
         efi_loaded_image_t *image;
         void *options;
-        u32 load_options_size;
         efi_guid_t proto = LOADED_IMAGE_PROTOCOL_GUID;
         int options_size = 0;
         efi_status_t status;
-        unsigned long cmdline;
+        char *cmdline_ptr;
         u16 *s2;
         u8 *s1;
         int i;
@@ -487,41 +486,11 @@ struct boot_params *make_boot_params(void *handle, efi_system_table_t *_table)
         hdr->type_of_loader = 0x21;
 
         /* Convert unicode cmdline to ascii */
-        options = image->load_options;
-        load_options_size = image->load_options_size / 2; /* ASCII */
-        cmdline = 0;
-        s2 = (u16 *)options;
-
-        if (s2) {
-                while (*s2 && *s2 != '\n' && options_size < load_options_size) {
-                        s2++;
-                        options_size++;
-                }
-
-                if (options_size) {
-                        if (options_size > hdr->cmdline_size)
-                                options_size = hdr->cmdline_size;
-
-                        options_size++; /* NUL termination */
-
-                        status = efi_low_alloc(sys_table, options_size, 1,
-                                           &cmdline);
-                        if (status != EFI_SUCCESS) {
-                                efi_printk(sys_table, "Failed to alloc mem for cmdline\n");
-                                goto fail;
-                        }
-
-                        s1 = (u8 *)(unsigned long)cmdline;
-                        s2 = (u16 *)options;
-
-                        for (i = 0; i < options_size - 1; i++)
-                                *s1++ = *s2++;
-
-                        *s1 = '\0';
-                }
-        }
-
-        hdr->cmd_line_ptr = cmdline;
+        cmdline_ptr = efi_convert_cmdline_to_ascii(sys_table, image,
+                                                   &options_size);
+        if (!cmdline_ptr)
+                goto fail;
+        hdr->cmd_line_ptr = (unsigned long)cmdline_ptr;
 
         hdr->ramdisk_image = 0;
         hdr->ramdisk_size = 0;