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, 61 insertions, 0 deletions

diff --git a/drivers/firmware/efi/efi-stub-helper.c b/drivers/firmware/efi/efi-stub-helper.c
index 361e24d8d665..96665b730c51 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;
+}