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Diffstat (limited to 'arch/x86/boot/compressed/head_32.S')
-rw-r--r--arch/x86/boot/compressed/head_32.S22
1 files changed, 22 insertions, 0 deletions
diff --git a/arch/x86/boot/compressed/head_32.S b/arch/x86/boot/compressed/head_32.S
index 67a655a39ce..a0559930a18 100644
--- a/arch/x86/boot/compressed/head_32.S
+++ b/arch/x86/boot/compressed/head_32.S
@@ -32,6 +32,28 @@
__HEAD
ENTRY(startup_32)
+#ifdef CONFIG_EFI_STUB
+ /*
+ * We don't need the return address, so set up the stack so
+ * efi_main() can find its arugments.
+ */
+ add $0x4, %esp
+
+ call efi_main
+ cmpl $0, %eax
+ je preferred_addr
+ movl %eax, %esi
+ call 1f
+1:
+ popl %eax
+ subl $1b, %eax
+ subl BP_pref_address(%esi), %eax
+ add BP_code32_start(%esi), %eax
+ leal preferred_addr(%eax), %eax
+ jmp *%eax
+
+preferred_addr:
+#endif
cld
/*
* Test KEEP_SEGMENTS flag to see if the bootloader is asking