efi: Add 64-bit payload support

[karo-tx-uboot.git] / arch / x86 / lib / efi / crt0-efi-x86_64.S

diff --git a/arch/x86/lib/efi/crt0-efi-x86_64.S b/arch/x86/lib/efi/crt0-efi-x86_64.S
new file mode 100644 (file)
index 0000000..c5cbf41
--- /dev/null
+++ b/arch/x86/lib/efi/crt0-efi-x86_64.S
@@ -0,0 +1,51 @@
+/*
+ * crt0-efi-x86_64.S - x86_64 EFI startup code.
+ * Copyright (C) 1999 Hewlett-Packard Co.
+ * Contributed by David Mosberger <davidm@hpl.hp.com>.
+ * Copyright (C) 2005 Intel Co.
+ * Contributed by Fenghua Yu <fenghua.yu@intel.com>.
+ *
+ * All rights reserved.
+ * SPDX-License-Identifier:    BSD-3-Clause
+ */
+       .text
+       .align 4
+
+       .globl _start
+_start:
+       subq $8, %rsp
+       pushq %rcx
+       pushq %rdx
+
+0:
+       lea image_base(%rip), %rdi
+       lea _DYNAMIC(%rip), %rsi
+
+       popq %rcx
+       popq %rdx
+       pushq %rcx
+       pushq %rdx
+       call _relocate
+
+       popq %rdi
+       popq %rsi
+
+       call efi_main
+       addq $8, %rsp
+
+.exit:
+       ret
+
+       /*
+        * hand-craft a dummy .reloc section so EFI knows it's a relocatable
+        * executable:
+        */
+       .data
+dummy: .long   0
+
+#define IMAGE_REL_ABSOLUTE     0
+       .section .reloc, "a"
+label1:
+       .long   dummy-label1                            /* Page RVA */
+       .long   10                                      /* Block Size (2*4+2) */
+       .word   (IMAGE_REL_ABSOLUTE << 12) +  0         /* reloc for dummy */