x86: Add support for U-Boot as an EFI application

Add the required x86 glue code. This includes the initial start-up,
relocation and jumping to efi_main(). We also need to avoid fiddling with
interrupts.

Signed-off-by: Ben Stoltz <stoltz@google.com>
Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>

1 files changed, 72 insertions, 0 deletions

diff --git a/arch/x86/lib/efi/reloc_ia32.c b/arch/x86/lib/efi/reloc_ia32.c
new file mode 100644
index 0000000000..4d6825515d
--- /dev/null
+++ b/arch/x86/lib/efi/reloc_ia32.c
@@ -0,0 +1,72 @@
+/*
+ * reloc_ia32.c - position independent x86 ELF shared object relocator
+ * Copyright (C) 1999 Hewlett-Packard Co.
+ * Contributed by David Mosberger <davidm@hpl.hp.com>.
+ *
+ * All rights reserved.
+ *
+ * SPDX-License-Identifier:	BSD-3-Clause
+ */
+
+#include <common.h>
+#include <efi.h>
+#include <elf.h>
+#include <asm/elf.h>
+
+efi_status_t _relocate(long ldbase, Elf32_Dyn *dyn, efi_handle_t image,
+		       struct efi_system_table *systab)
+{
+	long relsz = 0, relent = 0;
+	Elf32_Rel *rel = 0;
+	unsigned long *addr;
+	int i;
+
+	for (i = 0; dyn[i].d_tag != DT_NULL; ++i) {
+		switch (dyn[i].d_tag) {
+		case DT_REL:
+			rel = (Elf32_Rel *)((unsigned long)dyn[i].d_un.d_ptr +
+								ldbase);
+			break;
+
+		case DT_RELSZ:
+			relsz = dyn[i].d_un.d_val;
+			break;
+
+		case DT_RELENT:
+			relent = dyn[i].d_un.d_val;
+			break;
+
+		case DT_RELA:
+			break;
+
+		default:
+			break;
+		}
+	}
+
+	if (!rel && relent == 0)
+		return EFI_SUCCESS;
+
+	if (!rel || relent == 0)
+		return EFI_LOAD_ERROR;
+
+	while (relsz > 0) {
+		/* apply the relocs */
+		switch (ELF32_R_TYPE(rel->r_info)) {
+		case R_386_NONE:
+			break;
+
+		case R_386_RELATIVE:
+			addr = (unsigned long *)(ldbase + rel->r_offset);
+			*addr += ldbase;
+			break;
+
+		default:
+			break;
+		}
+		rel = (Elf32_Rel *)((char *)rel + relent);
+		relsz -= relent;
+	}
+
+	return EFI_SUCCESS;
+}